diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
new file mode 100644
index 0000000..3c52212
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE.md
@@ -0,0 +1,16 @@
+## Expected Behavior
+
+
+## Actual Behavior
+
+
+## Steps to Reproduce the Problem
+
+1.
+1.
+1.
+
+## Specifications
+
+- Version:
+- Platform:
\ No newline at end of file
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 0000000..0787bd9
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,6 @@
+Fixes #<issue_number_goes_here>
+
+> It's a good idea to open an issue first for discussion.
+
+- [ ] Tests pass
+- [ ] Appropriate changes to README are included in PR
\ No newline at end of file
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..c928405
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,38 @@
+package {
+    default_applicable_licenses: ["external_wuffs-mirror-release-c_license"],
+}
+
+// Added automatically by a large-scale-change
+// See: http://go/android-license-faq
+license {
+    name: "external_wuffs-mirror-release-c_license",
+    visibility: [":__subpackages__"],
+    license_kinds: [
+        "SPDX-license-identifier-Apache-2.0",
+    ],
+    license_text: [
+        "LICENSE",
+    ],
+}
+
+cc_library_static {
+    name: "libwuffs_mirror_release_c",
+    export_include_dirs: ["release/c"],
+    cflags: [
+        "-DWUFFS_IMPLEMENTATION",
+        "-DWUFFS_CONFIG__MODULES",
+        "-DWUFFS_CONFIG__MODULE__BASE",
+        "-DWUFFS_CONFIG__MODULE__GIF",
+        "-DWUFFS_CONFIG__MODULE__LZW",
+    ],
+    srcs: [
+        "release/c/wuffs-v0.3.c",
+    ],
+    sdk_version: "minimum",
+    host_supported: true,
+    target: {
+      windows: {
+        enabled: true,
+      },
+    },
+}
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
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+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+      whether in tort (including negligence), contract, or otherwise,
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+      negligent acts) or agreed to in writing, shall any Contributor be
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+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+   Unless required by applicable law or agreed to in writing, software
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diff --git a/METADATA b/METADATA
new file mode 100644
index 0000000..1dc143c
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,13 @@
+name: "Wuffs Mirror Release C"
+description:
+    ""
+
+third_party {
+  url {
+    type: GIT
+    value: "https://skia.googlesource.com/external/github.com/google/wuffs-mirror-release-c/"
+  }
+  version: "a0e2454f0c21369f9775cad3bcaf1e3bb1db70b6"
+  last_upgrade_date { year: 2021 month: 12 day: 8 }
+  license_type: NOTICE
+}
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_APACHE2
diff --git a/OWNERS.android b/OWNERS.android
new file mode 100644
index 0000000..fcc8cc4
--- /dev/null
+++ b/OWNERS.android
@@ -0,0 +1,2 @@
+scroggo@google.com
+nigeltao@google.com
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..500d32c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,38 @@
+# Wuffs Mirror (release/c)
+
+This repository mirrors a subset of the
+[Wuffs](https://github.com/google/wuffs) (Wrangling Untrusted File Formats
+Safely) repository.
+
+Wuffs is both a programming language (Wuffs-the-language) and a standard
+library (Wuffs-the-library) written in that language. The Wuffs toolchain
+converts from Wuffs-the-language to C and Wuffs-the-library is available as a
+single C file - a [header file
+library](https://github.com/nothings/stb/blob/master/docs/stb_howto.txt).
+
+People who just want to *use* Wuffs-the-library in its C form (instead of
+*modifying* its Wuffs form or otherwise needing Wuffs-the-language tools) only
+need that one C file.
+
+This repository's [`release/c`](./release/c) directory contains that C file (at
+various versions). It mirrors the `release/c` directory of the [original Wuffs
+repository](https://github.com/google/wuffs) (except for the "unsupported
+snapshot" version). By excluding everything else, this repository is much
+smaller and changes much less frequently.
+
+
+## Updates
+
+This repository's `release/c` directory is manually updated by the
+`script/sync.sh` shell script, which also logs to [`sync.txt`](./sync.txt).
+
+
+## Disclaimer
+
+This is not an official Google product, it is just code that happens to be
+owned by Google.
+
+
+---
+
+Updated on March 2021.
diff --git a/docs/code-of-conduct.md b/docs/code-of-conduct.md
new file mode 100644
index 0000000..dc079b4
--- /dev/null
+++ b/docs/code-of-conduct.md
@@ -0,0 +1,93 @@
+# Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of
+experience, education, socio-economic status, nationality, personal appearance,
+race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+*   Using welcoming and inclusive language
+*   Being respectful of differing viewpoints and experiences
+*   Gracefully accepting constructive criticism
+*   Focusing on what is best for the community
+*   Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+*   The use of sexualized language or imagery and unwelcome sexual attention or
+    advances
+*   Trolling, insulting/derogatory comments, and personal or political attacks
+*   Public or private harassment
+*   Publishing others' private information, such as a physical or electronic
+    address, without explicit permission
+*   Other conduct which could reasonably be considered inappropriate in a
+    professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, or to ban temporarily or permanently any
+contributor for other behaviors that they deem inappropriate, threatening,
+offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+This Code of Conduct also applies outside the project spaces when the Project
+Steward has a reasonable belief that an individual's behavior may have a
+negative impact on the project or its community.
+
+## Conflict Resolution
+
+We do not believe that all conflict is bad; healthy debate and disagreement
+often yield positive results. However, it is never okay to be disrespectful or
+to engage in behavior that violates the project’s code of conduct.
+
+If you see someone violating the code of conduct, you are encouraged to address
+the behavior directly with those involved. Many issues can be resolved quickly
+and easily, and this gives people more control over the outcome of their
+dispute. If you are unable to resolve the matter for any reason, or if the
+behavior is threatening or harassing, report it. We are dedicated to providing
+an environment where participants feel welcome and safe.
+
+Reports should be directed to *[PROJECT STEWARD NAME(s) AND EMAIL(s)]*, the
+Project Steward(s) for *[PROJECT NAME]*. It is the Project Steward’s duty to
+receive and address reported violations of the code of conduct. They will then
+work with a committee consisting of representatives from the Open Source
+Programs Office and the Google Open Source Strategy team. If for any reason you
+are uncomfortable reaching out to the Project Steward, please email
+opensource@google.com.
+
+We will investigate every complaint, but you may not receive a direct response.
+We will use our discretion in determining when and how to follow up on reported
+incidents, which may range from not taking action to permanent expulsion from
+the project and project-sponsored spaces. We will notify the accused of the
+report and provide them an opportunity to discuss it before any action is taken.
+The identity of the reporter will be omitted from the details of the report
+supplied to the accused. In potentially harmful situations, such as ongoing
+harassment or threats to anyone's safety, we may take action without notice.
+
+## Attribution
+
+This Code of Conduct is adapted from the Contributor Covenant, version 1.4,
+available at
+https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
diff --git a/docs/contributing.md b/docs/contributing.md
new file mode 100644
index 0000000..6272489
--- /dev/null
+++ b/docs/contributing.md
@@ -0,0 +1,28 @@
+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution;
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code Reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
+
+## Community Guidelines
+
+This project follows [Google's Open Source Community
+Guidelines](https://opensource.google/conduct/).
diff --git a/release/c/README.md b/release/c/README.md
new file mode 100644
index 0000000..9b45a9c
--- /dev/null
+++ b/release/c/README.md
@@ -0,0 +1,35 @@
+# Releases (in the C Programming Language)
+
+[Wuffs the Library](/doc/wuffs-the-library.md) ships as a "single file C
+library", also known as a "[header file
+library](https://github.com/nothings/stb/blob/master/docs/stb_howto.txt)".
+
+To use that library in your C/C++ project, you just need to copy one file from
+this directory, or otherwise integrate that one file into your build system.
+Typically, pick the latest stable version (but not the unsupported snapshot),
+with a filename like `wuffs-vMAJOR.MINOR.c` for version MAJOR.MINOR.
+
+To use that single file as a "foo.c"-like implementation, instead of a
+"foo.h"-like header, `#define WUFFS_IMPLEMENTATION` before `#include`'ing or
+compiling it.
+
+
+# Latest Stable Version
+
+**Version 0.2 (December 2019)** is the latest stable version. Stable means that
+its API won't change any further, but being a "version 0.x" means that:
+
+- It will not have long term support.
+- Newer versions make no promises about compatibility.
+
+
+# Mirror
+
+Wuffs' canonical repository is located at
+[github.com/google/wuffs](https://github.com/google/wuffs). If you just want to
+*use* Wuffs-the-library in its C form (instead of *modifying* its Wuffs form or
+otherwise needing Wuffs-the-language tools), a mirror of just the `release/c`
+directory is located at
+[github.com/google/wuffs-mirror-release-c](https://github.com/google/wuffs-mirror-release-c).
+By excluding everything else, the mirror is much smaller than and changes much
+less frequently than the canonical repository.
diff --git a/release/c/wuffs-v0.2.c b/release/c/wuffs-v0.2.c
new file mode 100644
index 0000000..f26262a
--- /dev/null
+++ b/release/c/wuffs-v0.2.c
@@ -0,0 +1,11858 @@
+#ifndef WUFFS_INCLUDE_GUARD
+#define WUFFS_INCLUDE_GUARD
+
+// Wuffs ships as a "single file C library" or "header file library" as per
+// https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
+//
+// To use that single file as a "foo.c"-like implementation, instead of a
+// "foo.h"-like header, #define WUFFS_IMPLEMENTATION before #include'ing or
+// compiling it.
+
+// Copyright 2017 The Wuffs Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+
+// GCC does not warn for unused *static inline* functions, but clang does.
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Wuffs assumes that:
+//  - converting a uint32_t to a size_t will never overflow.
+//  - converting a size_t to a uint64_t will never overflow.
+#ifdef __WORDSIZE
+#if (__WORDSIZE != 32) && (__WORDSIZE != 64)
+#error "Wuffs requires a word size of either 32 or 64 bits"
+#endif
+#endif
+
+// WUFFS_VERSION is the major.minor.patch version, as per https://semver.org/,
+// as a uint64_t. The major number is the high 32 bits. The minor number is the
+// middle 16 bits. The patch number is the low 16 bits. The pre-release label
+// and build metadata are part of the string representation (such as
+// "1.2.3-beta+456.20181231") but not the uint64_t representation.
+//
+// WUFFS_VERSION_PRE_RELEASE_LABEL (such as "", "beta" or "rc.1") being
+// non-empty denotes a developer preview, not a release version, and has no
+// backwards or forwards compatibility guarantees.
+//
+// WUFFS_VERSION_BUILD_METADATA_XXX, if non-zero, are the number of commits and
+// the last commit date in the repository used to build this library. Within
+// each major.minor branch, the commit count should increase monotonically.
+//
+// WUFFS_VERSION was overridden by "wuffs gen -version" based on revision
+// b36c9f019f2908639b0bb4dd5b8337bb3daf3271 committed on 2019-12-19.
+#define WUFFS_VERSION ((uint64_t)0x0000000000020000)
+#define WUFFS_VERSION_MAJOR ((uint64_t)0x00000000)
+#define WUFFS_VERSION_MINOR ((uint64_t)0x0002)
+#define WUFFS_VERSION_PATCH ((uint64_t)0x0000)
+#define WUFFS_VERSION_PRE_RELEASE_LABEL ""
+#define WUFFS_VERSION_BUILD_METADATA_COMMIT_COUNT 2078
+#define WUFFS_VERSION_BUILD_METADATA_COMMIT_DATE 20191219
+#define WUFFS_VERSION_STRING "0.2.0+2078.20191219"
+
+// Define WUFFS_CONFIG__STATIC_FUNCTIONS to make all of Wuffs' functions have
+// static storage. The motivation is discussed in the "ALLOW STATIC
+// IMPLEMENTATION" section of
+// https://raw.githubusercontent.com/nothings/stb/master/docs/stb_howto.txt
+#ifdef WUFFS_CONFIG__STATIC_FUNCTIONS
+#define WUFFS_BASE__MAYBE_STATIC static
+#else
+#define WUFFS_BASE__MAYBE_STATIC
+#endif
+
+#if defined(__clang__)
+#define WUFFS_BASE__POTENTIALLY_UNUSED_FIELD __attribute__((unused))
+#else
+#define WUFFS_BASE__POTENTIALLY_UNUSED_FIELD
+#endif
+
+// Clang also defines "__GNUC__".
+#if defined(__GNUC__)
+#define WUFFS_BASE__POTENTIALLY_UNUSED __attribute__((unused))
+#define WUFFS_BASE__WARN_UNUSED_RESULT __attribute__((warn_unused_result))
+#else
+#define WUFFS_BASE__POTENTIALLY_UNUSED
+#define WUFFS_BASE__WARN_UNUSED_RESULT
+#endif
+
+// Flags for wuffs_foo__bar__initialize functions.
+
+#define WUFFS_INITIALIZE__DEFAULT_OPTIONS ((uint32_t)0x00000000)
+
+// WUFFS_INITIALIZE__ALREADY_ZEROED means that the "self" receiver struct value
+// has already been set to all zeroes.
+#define WUFFS_INITIALIZE__ALREADY_ZEROED ((uint32_t)0x00000001)
+
+// WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED means that, absent
+// WUFFS_INITIALIZE__ALREADY_ZEROED, only some of the "self" receiver struct
+// value will be set to all zeroes. Internal buffers, which tend to be a large
+// proportion of the struct's size, will be left uninitialized. Internal means
+// that the buffer is contained by the receiver struct, as opposed to being
+// passed as a separately allocated "work buffer".
+//
+// For more detail, see:
+// https://github.com/google/wuffs/blob/master/doc/note/initialization.md
+#define WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED \
+  ((uint32_t)0x00000002)
+
+// --------
+
+// wuffs_base__empty_struct is used when a Wuffs function returns an empty
+// struct. In C, if a function f returns void, you can't say "x = f()", but in
+// Wuffs, if a function g returns empty, you can say "y = g()".
+typedef struct {
+  // private_impl is a placeholder field. It isn't explicitly used, except that
+  // without it, the sizeof a struct with no fields can differ across C/C++
+  // compilers, and it is undefined behavior in C99. For example, gcc says that
+  // the sizeof an empty struct is 0, and g++ says that it is 1. This leads to
+  // ABI incompatibility if a Wuffs .c file is processed by one compiler and
+  // its .h file with another compiler.
+  //
+  // Instead, we explicitly insert an otherwise unused field, so that the
+  // sizeof this struct is always 1.
+  uint8_t private_impl;
+} wuffs_base__empty_struct;
+
+static inline wuffs_base__empty_struct  //
+wuffs_base__make_empty_struct() {
+  wuffs_base__empty_struct ret;
+  ret.private_impl = 0;
+  return ret;
+}
+
+// wuffs_base__utility is a placeholder receiver type. It enables what Java
+// calls static methods, as opposed to regular methods.
+typedef struct {
+  // private_impl is a placeholder field. It isn't explicitly used, except that
+  // without it, the sizeof a struct with no fields can differ across C/C++
+  // compilers, and it is undefined behavior in C99. For example, gcc says that
+  // the sizeof an empty struct is 0, and g++ says that it is 1. This leads to
+  // ABI incompatibility if a Wuffs .c file is processed by one compiler and
+  // its .h file with another compiler.
+  //
+  // Instead, we explicitly insert an otherwise unused field, so that the
+  // sizeof this struct is always 1.
+  uint8_t private_impl;
+} wuffs_base__utility;
+
+// --------
+
+// See https://github.com/google/wuffs/blob/master/doc/note/statuses.md
+typedef const char* wuffs_base__status;
+
+extern const char* wuffs_base__warning__end_of_data;
+extern const char* wuffs_base__warning__metadata_reported;
+extern const char* wuffs_base__suspension__short_read;
+extern const char* wuffs_base__suspension__short_write;
+extern const char* wuffs_base__error__bad_i_o_position;
+extern const char* wuffs_base__error__bad_argument_length_too_short;
+extern const char* wuffs_base__error__bad_argument;
+extern const char* wuffs_base__error__bad_call_sequence;
+extern const char* wuffs_base__error__bad_receiver;
+extern const char* wuffs_base__error__bad_restart;
+extern const char* wuffs_base__error__bad_sizeof_receiver;
+extern const char* wuffs_base__error__bad_workbuf_length;
+extern const char* wuffs_base__error__bad_wuffs_version;
+extern const char* wuffs_base__error__cannot_return_a_suspension;
+extern const char* wuffs_base__error__disabled_by_previous_error;
+extern const char* wuffs_base__error__initialize_falsely_claimed_already_zeroed;
+extern const char* wuffs_base__error__initialize_not_called;
+extern const char* wuffs_base__error__interleaved_coroutine_calls;
+extern const char* wuffs_base__error__not_enough_data;
+extern const char* wuffs_base__error__unsupported_option;
+extern const char* wuffs_base__error__too_much_data;
+
+static inline bool  //
+wuffs_base__status__is_complete(wuffs_base__status z) {
+  return (z == NULL) || ((*z != '$') && (*z != '#'));
+}
+
+static inline bool  //
+wuffs_base__status__is_error(wuffs_base__status z) {
+  return z && (*z == '#');
+}
+
+static inline bool  //
+wuffs_base__status__is_ok(wuffs_base__status z) {
+  return z == NULL;
+}
+
+static inline bool  //
+wuffs_base__status__is_suspension(wuffs_base__status z) {
+  return z && (*z == '$');
+}
+
+static inline bool  //
+wuffs_base__status__is_warning(wuffs_base__status z) {
+  return z && (*z != '$') && (*z != '#');
+}
+
+// wuffs_base__status__message strips the leading '$', '#' or '@'.
+static inline const char*  //
+wuffs_base__status__message(wuffs_base__status z) {
+  if (z) {
+    if ((*z == '$') || (*z == '#') || (*z == '@')) {
+      return z + 1;
+    }
+  }
+  return z;
+}
+
+// --------
+
+// FourCC constants.
+
+// International Color Consortium Profile.
+#define WUFFS_BASE__FOURCC__ICCP 0x49434350
+
+// Extensible Metadata Platform.
+#define WUFFS_BASE__FOURCC__XMP 0x584D5020
+
+// --------
+
+// Flicks are a unit of time. One flick (frame-tick) is 1 / 705_600_000 of a
+// second. See https://github.com/OculusVR/Flicks
+typedef int64_t wuffs_base__flicks;
+
+#define WUFFS_BASE__FLICKS_PER_SECOND ((uint64_t)705600000)
+#define WUFFS_BASE__FLICKS_PER_MILLISECOND ((uint64_t)705600)
+
+// ---------------- Numeric Types
+
+static inline uint8_t  //
+wuffs_base__u8__min(uint8_t x, uint8_t y) {
+  return x < y ? x : y;
+}
+
+static inline uint8_t  //
+wuffs_base__u8__max(uint8_t x, uint8_t y) {
+  return x > y ? x : y;
+}
+
+static inline uint16_t  //
+wuffs_base__u16__min(uint16_t x, uint16_t y) {
+  return x < y ? x : y;
+}
+
+static inline uint16_t  //
+wuffs_base__u16__max(uint16_t x, uint16_t y) {
+  return x > y ? x : y;
+}
+
+static inline uint32_t  //
+wuffs_base__u32__min(uint32_t x, uint32_t y) {
+  return x < y ? x : y;
+}
+
+static inline uint32_t  //
+wuffs_base__u32__max(uint32_t x, uint32_t y) {
+  return x > y ? x : y;
+}
+
+static inline uint64_t  //
+wuffs_base__u64__min(uint64_t x, uint64_t y) {
+  return x < y ? x : y;
+}
+
+static inline uint64_t  //
+wuffs_base__u64__max(uint64_t x, uint64_t y) {
+  return x > y ? x : y;
+}
+
+// --------
+
+// Saturating arithmetic (sat_add, sat_sub) branchless bit-twiddling algorithms
+// are per https://locklessinc.com/articles/sat_arithmetic/
+//
+// It is important that the underlying types are unsigned integers, as signed
+// integer arithmetic overflow is undefined behavior in C.
+
+static inline uint8_t  //
+wuffs_base__u8__sat_add(uint8_t x, uint8_t y) {
+  uint8_t res = (uint8_t)(x + y);
+  res |= (uint8_t)(-(res < x));
+  return res;
+}
+
+static inline uint8_t  //
+wuffs_base__u8__sat_sub(uint8_t x, uint8_t y) {
+  uint8_t res = (uint8_t)(x - y);
+  res &= (uint8_t)(-(res <= x));
+  return res;
+}
+
+static inline uint16_t  //
+wuffs_base__u16__sat_add(uint16_t x, uint16_t y) {
+  uint16_t res = (uint16_t)(x + y);
+  res |= (uint16_t)(-(res < x));
+  return res;
+}
+
+static inline uint16_t  //
+wuffs_base__u16__sat_sub(uint16_t x, uint16_t y) {
+  uint16_t res = (uint16_t)(x - y);
+  res &= (uint16_t)(-(res <= x));
+  return res;
+}
+
+static inline uint32_t  //
+wuffs_base__u32__sat_add(uint32_t x, uint32_t y) {
+  uint32_t res = (uint32_t)(x + y);
+  res |= (uint32_t)(-(res < x));
+  return res;
+}
+
+static inline uint32_t  //
+wuffs_base__u32__sat_sub(uint32_t x, uint32_t y) {
+  uint32_t res = (uint32_t)(x - y);
+  res &= (uint32_t)(-(res <= x));
+  return res;
+}
+
+static inline uint64_t  //
+wuffs_base__u64__sat_add(uint64_t x, uint64_t y) {
+  uint64_t res = (uint64_t)(x + y);
+  res |= (uint64_t)(-(res < x));
+  return res;
+}
+
+static inline uint64_t  //
+wuffs_base__u64__sat_sub(uint64_t x, uint64_t y) {
+  uint64_t res = (uint64_t)(x - y);
+  res &= (uint64_t)(-(res <= x));
+  return res;
+}
+
+// ---------------- Slices and Tables
+
+// WUFFS_BASE__SLICE is a 1-dimensional buffer.
+//
+// len measures a number of elements, not necessarily a size in bytes.
+//
+// A value with all fields NULL or zero is a valid, empty slice.
+#define WUFFS_BASE__SLICE(T) \
+  struct {                   \
+    T* ptr;                  \
+    size_t len;              \
+  }
+
+// WUFFS_BASE__TABLE is a 2-dimensional buffer.
+//
+// width height, and stride measure a number of elements, not necessarily a
+// size in bytes.
+//
+// A value with all fields NULL or zero is a valid, empty table.
+#define WUFFS_BASE__TABLE(T) \
+  struct {                   \
+    T* ptr;                  \
+    size_t width;            \
+    size_t height;           \
+    size_t stride;           \
+  }
+
+typedef WUFFS_BASE__SLICE(uint8_t) wuffs_base__slice_u8;
+typedef WUFFS_BASE__SLICE(uint16_t) wuffs_base__slice_u16;
+typedef WUFFS_BASE__SLICE(uint32_t) wuffs_base__slice_u32;
+typedef WUFFS_BASE__SLICE(uint64_t) wuffs_base__slice_u64;
+
+typedef WUFFS_BASE__TABLE(uint8_t) wuffs_base__table_u8;
+typedef WUFFS_BASE__TABLE(uint16_t) wuffs_base__table_u16;
+typedef WUFFS_BASE__TABLE(uint32_t) wuffs_base__table_u32;
+typedef WUFFS_BASE__TABLE(uint64_t) wuffs_base__table_u64;
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__make_slice_u8(uint8_t* ptr, size_t len) {
+  wuffs_base__slice_u8 ret;
+  ret.ptr = ptr;
+  ret.len = len;
+  return ret;
+}
+
+static inline wuffs_base__slice_u16  //
+wuffs_base__make_slice_u16(uint16_t* ptr, size_t len) {
+  wuffs_base__slice_u16 ret;
+  ret.ptr = ptr;
+  ret.len = len;
+  return ret;
+}
+
+static inline wuffs_base__slice_u32  //
+wuffs_base__make_slice_u32(uint32_t* ptr, size_t len) {
+  wuffs_base__slice_u32 ret;
+  ret.ptr = ptr;
+  ret.len = len;
+  return ret;
+}
+
+static inline wuffs_base__slice_u64  //
+wuffs_base__make_slice_u64(uint64_t* ptr, size_t len) {
+  wuffs_base__slice_u64 ret;
+  ret.ptr = ptr;
+  ret.len = len;
+  return ret;
+}
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__empty_slice_u8() {
+  wuffs_base__slice_u8 ret;
+  ret.ptr = NULL;
+  ret.len = 0;
+  return ret;
+}
+
+static inline wuffs_base__table_u8  //
+wuffs_base__empty_table_u8() {
+  wuffs_base__table_u8 ret;
+  ret.ptr = NULL;
+  ret.width = 0;
+  ret.height = 0;
+  ret.stride = 0;
+  return ret;
+}
+
+// wuffs_base__slice_u8__subslice_i returns s[i:].
+//
+// It returns an empty slice if i is out of bounds.
+static inline wuffs_base__slice_u8  //
+wuffs_base__slice_u8__subslice_i(wuffs_base__slice_u8 s, uint64_t i) {
+  if ((i <= SIZE_MAX) && (i <= s.len)) {
+    return wuffs_base__make_slice_u8(s.ptr + i, s.len - i);
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+// wuffs_base__slice_u8__subslice_j returns s[:j].
+//
+// It returns an empty slice if j is out of bounds.
+static inline wuffs_base__slice_u8  //
+wuffs_base__slice_u8__subslice_j(wuffs_base__slice_u8 s, uint64_t j) {
+  if ((j <= SIZE_MAX) && (j <= s.len)) {
+    return wuffs_base__make_slice_u8(s.ptr, j);
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+// wuffs_base__slice_u8__subslice_ij returns s[i:j].
+//
+// It returns an empty slice if i or j is out of bounds.
+static inline wuffs_base__slice_u8  //
+wuffs_base__slice_u8__subslice_ij(wuffs_base__slice_u8 s,
+                                  uint64_t i,
+                                  uint64_t j) {
+  if ((i <= j) && (j <= SIZE_MAX) && (j <= s.len)) {
+    return wuffs_base__make_slice_u8(s.ptr + i, j - i);
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+// ---------------- Ranges and Rects
+
+// See https://github.com/google/wuffs/blob/master/doc/note/ranges-and-rects.md
+
+typedef struct wuffs_base__range_ii_u32__struct {
+  uint32_t min_incl;
+  uint32_t max_incl;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__range_ii_u32__struct s) const;
+  inline wuffs_base__range_ii_u32__struct intersect(
+      wuffs_base__range_ii_u32__struct s) const;
+  inline wuffs_base__range_ii_u32__struct unite(
+      wuffs_base__range_ii_u32__struct s) const;
+  inline bool contains(uint32_t x) const;
+  inline bool contains_range(wuffs_base__range_ii_u32__struct s) const;
+#endif  // __cplusplus
+
+} wuffs_base__range_ii_u32;
+
+static inline wuffs_base__range_ii_u32  //
+wuffs_base__make_range_ii_u32(uint32_t min_incl, uint32_t max_incl) {
+  wuffs_base__range_ii_u32 ret;
+  ret.min_incl = min_incl;
+  ret.max_incl = max_incl;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u32__is_empty(const wuffs_base__range_ii_u32* r) {
+  return r->min_incl > r->max_incl;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u32__equals(const wuffs_base__range_ii_u32* r,
+                                 wuffs_base__range_ii_u32 s) {
+  return (r->min_incl == s.min_incl && r->max_incl == s.max_incl) ||
+         (wuffs_base__range_ii_u32__is_empty(r) &&
+          wuffs_base__range_ii_u32__is_empty(&s));
+}
+
+static inline wuffs_base__range_ii_u32  //
+wuffs_base__range_ii_u32__intersect(const wuffs_base__range_ii_u32* r,
+                                    wuffs_base__range_ii_u32 s) {
+  wuffs_base__range_ii_u32 t;
+  t.min_incl = wuffs_base__u32__max(r->min_incl, s.min_incl);
+  t.max_incl = wuffs_base__u32__min(r->max_incl, s.max_incl);
+  return t;
+}
+
+static inline wuffs_base__range_ii_u32  //
+wuffs_base__range_ii_u32__unite(const wuffs_base__range_ii_u32* r,
+                                wuffs_base__range_ii_u32 s) {
+  if (wuffs_base__range_ii_u32__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__range_ii_u32__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__range_ii_u32 t;
+  t.min_incl = wuffs_base__u32__min(r->min_incl, s.min_incl);
+  t.max_incl = wuffs_base__u32__max(r->max_incl, s.max_incl);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u32__contains(const wuffs_base__range_ii_u32* r,
+                                   uint32_t x) {
+  return (r->min_incl <= x) && (x <= r->max_incl);
+}
+
+static inline bool  //
+wuffs_base__range_ii_u32__contains_range(const wuffs_base__range_ii_u32* r,
+                                         wuffs_base__range_ii_u32 s) {
+  return wuffs_base__range_ii_u32__equals(
+      &s, wuffs_base__range_ii_u32__intersect(r, s));
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__range_ii_u32::is_empty() const {
+  return wuffs_base__range_ii_u32__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__range_ii_u32::equals(wuffs_base__range_ii_u32 s) const {
+  return wuffs_base__range_ii_u32__equals(this, s);
+}
+
+inline wuffs_base__range_ii_u32  //
+wuffs_base__range_ii_u32::intersect(wuffs_base__range_ii_u32 s) const {
+  return wuffs_base__range_ii_u32__intersect(this, s);
+}
+
+inline wuffs_base__range_ii_u32  //
+wuffs_base__range_ii_u32::unite(wuffs_base__range_ii_u32 s) const {
+  return wuffs_base__range_ii_u32__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__range_ii_u32::contains(uint32_t x) const {
+  return wuffs_base__range_ii_u32__contains(this, x);
+}
+
+inline bool  //
+wuffs_base__range_ii_u32::contains_range(wuffs_base__range_ii_u32 s) const {
+  return wuffs_base__range_ii_u32__contains_range(this, s);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__range_ie_u32__struct {
+  uint32_t min_incl;
+  uint32_t max_excl;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__range_ie_u32__struct s) const;
+  inline wuffs_base__range_ie_u32__struct intersect(
+      wuffs_base__range_ie_u32__struct s) const;
+  inline wuffs_base__range_ie_u32__struct unite(
+      wuffs_base__range_ie_u32__struct s) const;
+  inline bool contains(uint32_t x) const;
+  inline bool contains_range(wuffs_base__range_ie_u32__struct s) const;
+  inline uint32_t length() const;
+#endif  // __cplusplus
+
+} wuffs_base__range_ie_u32;
+
+static inline wuffs_base__range_ie_u32  //
+wuffs_base__make_range_ie_u32(uint32_t min_incl, uint32_t max_excl) {
+  wuffs_base__range_ie_u32 ret;
+  ret.min_incl = min_incl;
+  ret.max_excl = max_excl;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u32__is_empty(const wuffs_base__range_ie_u32* r) {
+  return r->min_incl >= r->max_excl;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u32__equals(const wuffs_base__range_ie_u32* r,
+                                 wuffs_base__range_ie_u32 s) {
+  return (r->min_incl == s.min_incl && r->max_excl == s.max_excl) ||
+         (wuffs_base__range_ie_u32__is_empty(r) &&
+          wuffs_base__range_ie_u32__is_empty(&s));
+}
+
+static inline wuffs_base__range_ie_u32  //
+wuffs_base__range_ie_u32__intersect(const wuffs_base__range_ie_u32* r,
+                                    wuffs_base__range_ie_u32 s) {
+  wuffs_base__range_ie_u32 t;
+  t.min_incl = wuffs_base__u32__max(r->min_incl, s.min_incl);
+  t.max_excl = wuffs_base__u32__min(r->max_excl, s.max_excl);
+  return t;
+}
+
+static inline wuffs_base__range_ie_u32  //
+wuffs_base__range_ie_u32__unite(const wuffs_base__range_ie_u32* r,
+                                wuffs_base__range_ie_u32 s) {
+  if (wuffs_base__range_ie_u32__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__range_ie_u32__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__range_ie_u32 t;
+  t.min_incl = wuffs_base__u32__min(r->min_incl, s.min_incl);
+  t.max_excl = wuffs_base__u32__max(r->max_excl, s.max_excl);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u32__contains(const wuffs_base__range_ie_u32* r,
+                                   uint32_t x) {
+  return (r->min_incl <= x) && (x < r->max_excl);
+}
+
+static inline bool  //
+wuffs_base__range_ie_u32__contains_range(const wuffs_base__range_ie_u32* r,
+                                         wuffs_base__range_ie_u32 s) {
+  return wuffs_base__range_ie_u32__equals(
+      &s, wuffs_base__range_ie_u32__intersect(r, s));
+}
+
+static inline uint32_t  //
+wuffs_base__range_ie_u32__length(const wuffs_base__range_ie_u32* r) {
+  return wuffs_base__u32__sat_sub(r->max_excl, r->min_incl);
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__range_ie_u32::is_empty() const {
+  return wuffs_base__range_ie_u32__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__range_ie_u32::equals(wuffs_base__range_ie_u32 s) const {
+  return wuffs_base__range_ie_u32__equals(this, s);
+}
+
+inline wuffs_base__range_ie_u32  //
+wuffs_base__range_ie_u32::intersect(wuffs_base__range_ie_u32 s) const {
+  return wuffs_base__range_ie_u32__intersect(this, s);
+}
+
+inline wuffs_base__range_ie_u32  //
+wuffs_base__range_ie_u32::unite(wuffs_base__range_ie_u32 s) const {
+  return wuffs_base__range_ie_u32__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__range_ie_u32::contains(uint32_t x) const {
+  return wuffs_base__range_ie_u32__contains(this, x);
+}
+
+inline bool  //
+wuffs_base__range_ie_u32::contains_range(wuffs_base__range_ie_u32 s) const {
+  return wuffs_base__range_ie_u32__contains_range(this, s);
+}
+
+inline uint32_t  //
+wuffs_base__range_ie_u32::length() const {
+  return wuffs_base__range_ie_u32__length(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__range_ii_u64__struct {
+  uint64_t min_incl;
+  uint64_t max_incl;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__range_ii_u64__struct s) const;
+  inline wuffs_base__range_ii_u64__struct intersect(
+      wuffs_base__range_ii_u64__struct s) const;
+  inline wuffs_base__range_ii_u64__struct unite(
+      wuffs_base__range_ii_u64__struct s) const;
+  inline bool contains(uint64_t x) const;
+  inline bool contains_range(wuffs_base__range_ii_u64__struct s) const;
+#endif  // __cplusplus
+
+} wuffs_base__range_ii_u64;
+
+static inline wuffs_base__range_ii_u64  //
+wuffs_base__make_range_ii_u64(uint64_t min_incl, uint64_t max_incl) {
+  wuffs_base__range_ii_u64 ret;
+  ret.min_incl = min_incl;
+  ret.max_incl = max_incl;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u64__is_empty(const wuffs_base__range_ii_u64* r) {
+  return r->min_incl > r->max_incl;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u64__equals(const wuffs_base__range_ii_u64* r,
+                                 wuffs_base__range_ii_u64 s) {
+  return (r->min_incl == s.min_incl && r->max_incl == s.max_incl) ||
+         (wuffs_base__range_ii_u64__is_empty(r) &&
+          wuffs_base__range_ii_u64__is_empty(&s));
+}
+
+static inline wuffs_base__range_ii_u64  //
+wuffs_base__range_ii_u64__intersect(const wuffs_base__range_ii_u64* r,
+                                    wuffs_base__range_ii_u64 s) {
+  wuffs_base__range_ii_u64 t;
+  t.min_incl = wuffs_base__u64__max(r->min_incl, s.min_incl);
+  t.max_incl = wuffs_base__u64__min(r->max_incl, s.max_incl);
+  return t;
+}
+
+static inline wuffs_base__range_ii_u64  //
+wuffs_base__range_ii_u64__unite(const wuffs_base__range_ii_u64* r,
+                                wuffs_base__range_ii_u64 s) {
+  if (wuffs_base__range_ii_u64__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__range_ii_u64__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__range_ii_u64 t;
+  t.min_incl = wuffs_base__u64__min(r->min_incl, s.min_incl);
+  t.max_incl = wuffs_base__u64__max(r->max_incl, s.max_incl);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u64__contains(const wuffs_base__range_ii_u64* r,
+                                   uint64_t x) {
+  return (r->min_incl <= x) && (x <= r->max_incl);
+}
+
+static inline bool  //
+wuffs_base__range_ii_u64__contains_range(const wuffs_base__range_ii_u64* r,
+                                         wuffs_base__range_ii_u64 s) {
+  return wuffs_base__range_ii_u64__equals(
+      &s, wuffs_base__range_ii_u64__intersect(r, s));
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__range_ii_u64::is_empty() const {
+  return wuffs_base__range_ii_u64__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__range_ii_u64::equals(wuffs_base__range_ii_u64 s) const {
+  return wuffs_base__range_ii_u64__equals(this, s);
+}
+
+inline wuffs_base__range_ii_u64  //
+wuffs_base__range_ii_u64::intersect(wuffs_base__range_ii_u64 s) const {
+  return wuffs_base__range_ii_u64__intersect(this, s);
+}
+
+inline wuffs_base__range_ii_u64  //
+wuffs_base__range_ii_u64::unite(wuffs_base__range_ii_u64 s) const {
+  return wuffs_base__range_ii_u64__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__range_ii_u64::contains(uint64_t x) const {
+  return wuffs_base__range_ii_u64__contains(this, x);
+}
+
+inline bool  //
+wuffs_base__range_ii_u64::contains_range(wuffs_base__range_ii_u64 s) const {
+  return wuffs_base__range_ii_u64__contains_range(this, s);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__range_ie_u64__struct {
+  uint64_t min_incl;
+  uint64_t max_excl;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__range_ie_u64__struct s) const;
+  inline wuffs_base__range_ie_u64__struct intersect(
+      wuffs_base__range_ie_u64__struct s) const;
+  inline wuffs_base__range_ie_u64__struct unite(
+      wuffs_base__range_ie_u64__struct s) const;
+  inline bool contains(uint64_t x) const;
+  inline bool contains_range(wuffs_base__range_ie_u64__struct s) const;
+  inline uint64_t length() const;
+#endif  // __cplusplus
+
+} wuffs_base__range_ie_u64;
+
+static inline wuffs_base__range_ie_u64  //
+wuffs_base__make_range_ie_u64(uint64_t min_incl, uint64_t max_excl) {
+  wuffs_base__range_ie_u64 ret;
+  ret.min_incl = min_incl;
+  ret.max_excl = max_excl;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u64__is_empty(const wuffs_base__range_ie_u64* r) {
+  return r->min_incl >= r->max_excl;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u64__equals(const wuffs_base__range_ie_u64* r,
+                                 wuffs_base__range_ie_u64 s) {
+  return (r->min_incl == s.min_incl && r->max_excl == s.max_excl) ||
+         (wuffs_base__range_ie_u64__is_empty(r) &&
+          wuffs_base__range_ie_u64__is_empty(&s));
+}
+
+static inline wuffs_base__range_ie_u64  //
+wuffs_base__range_ie_u64__intersect(const wuffs_base__range_ie_u64* r,
+                                    wuffs_base__range_ie_u64 s) {
+  wuffs_base__range_ie_u64 t;
+  t.min_incl = wuffs_base__u64__max(r->min_incl, s.min_incl);
+  t.max_excl = wuffs_base__u64__min(r->max_excl, s.max_excl);
+  return t;
+}
+
+static inline wuffs_base__range_ie_u64  //
+wuffs_base__range_ie_u64__unite(const wuffs_base__range_ie_u64* r,
+                                wuffs_base__range_ie_u64 s) {
+  if (wuffs_base__range_ie_u64__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__range_ie_u64__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__range_ie_u64 t;
+  t.min_incl = wuffs_base__u64__min(r->min_incl, s.min_incl);
+  t.max_excl = wuffs_base__u64__max(r->max_excl, s.max_excl);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u64__contains(const wuffs_base__range_ie_u64* r,
+                                   uint64_t x) {
+  return (r->min_incl <= x) && (x < r->max_excl);
+}
+
+static inline bool  //
+wuffs_base__range_ie_u64__contains_range(const wuffs_base__range_ie_u64* r,
+                                         wuffs_base__range_ie_u64 s) {
+  return wuffs_base__range_ie_u64__equals(
+      &s, wuffs_base__range_ie_u64__intersect(r, s));
+}
+
+static inline uint64_t  //
+wuffs_base__range_ie_u64__length(const wuffs_base__range_ie_u64* r) {
+  return wuffs_base__u64__sat_sub(r->max_excl, r->min_incl);
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__range_ie_u64::is_empty() const {
+  return wuffs_base__range_ie_u64__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__range_ie_u64::equals(wuffs_base__range_ie_u64 s) const {
+  return wuffs_base__range_ie_u64__equals(this, s);
+}
+
+inline wuffs_base__range_ie_u64  //
+wuffs_base__range_ie_u64::intersect(wuffs_base__range_ie_u64 s) const {
+  return wuffs_base__range_ie_u64__intersect(this, s);
+}
+
+inline wuffs_base__range_ie_u64  //
+wuffs_base__range_ie_u64::unite(wuffs_base__range_ie_u64 s) const {
+  return wuffs_base__range_ie_u64__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__range_ie_u64::contains(uint64_t x) const {
+  return wuffs_base__range_ie_u64__contains(this, x);
+}
+
+inline bool  //
+wuffs_base__range_ie_u64::contains_range(wuffs_base__range_ie_u64 s) const {
+  return wuffs_base__range_ie_u64__contains_range(this, s);
+}
+
+inline uint64_t  //
+wuffs_base__range_ie_u64::length() const {
+  return wuffs_base__range_ie_u64__length(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__rect_ii_u32__struct {
+  uint32_t min_incl_x;
+  uint32_t min_incl_y;
+  uint32_t max_incl_x;
+  uint32_t max_incl_y;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__rect_ii_u32__struct s) const;
+  inline wuffs_base__rect_ii_u32__struct intersect(
+      wuffs_base__rect_ii_u32__struct s) const;
+  inline wuffs_base__rect_ii_u32__struct unite(
+      wuffs_base__rect_ii_u32__struct s) const;
+  inline bool contains(uint32_t x, uint32_t y) const;
+  inline bool contains_rect(wuffs_base__rect_ii_u32__struct s) const;
+#endif  // __cplusplus
+
+} wuffs_base__rect_ii_u32;
+
+static inline wuffs_base__rect_ii_u32  //
+wuffs_base__make_rect_ii_u32(uint32_t min_incl_x,
+                             uint32_t min_incl_y,
+                             uint32_t max_incl_x,
+                             uint32_t max_incl_y) {
+  wuffs_base__rect_ii_u32 ret;
+  ret.min_incl_x = min_incl_x;
+  ret.min_incl_y = min_incl_y;
+  ret.max_incl_x = max_incl_x;
+  ret.max_incl_y = max_incl_y;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__rect_ii_u32__is_empty(const wuffs_base__rect_ii_u32* r) {
+  return (r->min_incl_x > r->max_incl_x) || (r->min_incl_y > r->max_incl_y);
+}
+
+static inline bool  //
+wuffs_base__rect_ii_u32__equals(const wuffs_base__rect_ii_u32* r,
+                                wuffs_base__rect_ii_u32 s) {
+  return (r->min_incl_x == s.min_incl_x && r->min_incl_y == s.min_incl_y &&
+          r->max_incl_x == s.max_incl_x && r->max_incl_y == s.max_incl_y) ||
+         (wuffs_base__rect_ii_u32__is_empty(r) &&
+          wuffs_base__rect_ii_u32__is_empty(&s));
+}
+
+static inline wuffs_base__rect_ii_u32  //
+wuffs_base__rect_ii_u32__intersect(const wuffs_base__rect_ii_u32* r,
+                                   wuffs_base__rect_ii_u32 s) {
+  wuffs_base__rect_ii_u32 t;
+  t.min_incl_x = wuffs_base__u32__max(r->min_incl_x, s.min_incl_x);
+  t.min_incl_y = wuffs_base__u32__max(r->min_incl_y, s.min_incl_y);
+  t.max_incl_x = wuffs_base__u32__min(r->max_incl_x, s.max_incl_x);
+  t.max_incl_y = wuffs_base__u32__min(r->max_incl_y, s.max_incl_y);
+  return t;
+}
+
+static inline wuffs_base__rect_ii_u32  //
+wuffs_base__rect_ii_u32__unite(const wuffs_base__rect_ii_u32* r,
+                               wuffs_base__rect_ii_u32 s) {
+  if (wuffs_base__rect_ii_u32__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__rect_ii_u32__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__rect_ii_u32 t;
+  t.min_incl_x = wuffs_base__u32__min(r->min_incl_x, s.min_incl_x);
+  t.min_incl_y = wuffs_base__u32__min(r->min_incl_y, s.min_incl_y);
+  t.max_incl_x = wuffs_base__u32__max(r->max_incl_x, s.max_incl_x);
+  t.max_incl_y = wuffs_base__u32__max(r->max_incl_y, s.max_incl_y);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__rect_ii_u32__contains(const wuffs_base__rect_ii_u32* r,
+                                  uint32_t x,
+                                  uint32_t y) {
+  return (r->min_incl_x <= x) && (x <= r->max_incl_x) && (r->min_incl_y <= y) &&
+         (y <= r->max_incl_y);
+}
+
+static inline bool  //
+wuffs_base__rect_ii_u32__contains_rect(const wuffs_base__rect_ii_u32* r,
+                                       wuffs_base__rect_ii_u32 s) {
+  return wuffs_base__rect_ii_u32__equals(
+      &s, wuffs_base__rect_ii_u32__intersect(r, s));
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__rect_ii_u32::is_empty() const {
+  return wuffs_base__rect_ii_u32__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__rect_ii_u32::equals(wuffs_base__rect_ii_u32 s) const {
+  return wuffs_base__rect_ii_u32__equals(this, s);
+}
+
+inline wuffs_base__rect_ii_u32  //
+wuffs_base__rect_ii_u32::intersect(wuffs_base__rect_ii_u32 s) const {
+  return wuffs_base__rect_ii_u32__intersect(this, s);
+}
+
+inline wuffs_base__rect_ii_u32  //
+wuffs_base__rect_ii_u32::unite(wuffs_base__rect_ii_u32 s) const {
+  return wuffs_base__rect_ii_u32__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__rect_ii_u32::contains(uint32_t x, uint32_t y) const {
+  return wuffs_base__rect_ii_u32__contains(this, x, y);
+}
+
+inline bool  //
+wuffs_base__rect_ii_u32::contains_rect(wuffs_base__rect_ii_u32 s) const {
+  return wuffs_base__rect_ii_u32__contains_rect(this, s);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__rect_ie_u32__struct {
+  uint32_t min_incl_x;
+  uint32_t min_incl_y;
+  uint32_t max_excl_x;
+  uint32_t max_excl_y;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__rect_ie_u32__struct s) const;
+  inline wuffs_base__rect_ie_u32__struct intersect(
+      wuffs_base__rect_ie_u32__struct s) const;
+  inline wuffs_base__rect_ie_u32__struct unite(
+      wuffs_base__rect_ie_u32__struct s) const;
+  inline bool contains(uint32_t x, uint32_t y) const;
+  inline bool contains_rect(wuffs_base__rect_ie_u32__struct s) const;
+  inline uint32_t width() const;
+  inline uint32_t height() const;
+#endif  // __cplusplus
+
+} wuffs_base__rect_ie_u32;
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__make_rect_ie_u32(uint32_t min_incl_x,
+                             uint32_t min_incl_y,
+                             uint32_t max_excl_x,
+                             uint32_t max_excl_y) {
+  wuffs_base__rect_ie_u32 ret;
+  ret.min_incl_x = min_incl_x;
+  ret.min_incl_y = min_incl_y;
+  ret.max_excl_x = max_excl_x;
+  ret.max_excl_y = max_excl_y;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__rect_ie_u32__is_empty(const wuffs_base__rect_ie_u32* r) {
+  return (r->min_incl_x >= r->max_excl_x) || (r->min_incl_y >= r->max_excl_y);
+}
+
+static inline bool  //
+wuffs_base__rect_ie_u32__equals(const wuffs_base__rect_ie_u32* r,
+                                wuffs_base__rect_ie_u32 s) {
+  return (r->min_incl_x == s.min_incl_x && r->min_incl_y == s.min_incl_y &&
+          r->max_excl_x == s.max_excl_x && r->max_excl_y == s.max_excl_y) ||
+         (wuffs_base__rect_ie_u32__is_empty(r) &&
+          wuffs_base__rect_ie_u32__is_empty(&s));
+}
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__rect_ie_u32__intersect(const wuffs_base__rect_ie_u32* r,
+                                   wuffs_base__rect_ie_u32 s) {
+  wuffs_base__rect_ie_u32 t;
+  t.min_incl_x = wuffs_base__u32__max(r->min_incl_x, s.min_incl_x);
+  t.min_incl_y = wuffs_base__u32__max(r->min_incl_y, s.min_incl_y);
+  t.max_excl_x = wuffs_base__u32__min(r->max_excl_x, s.max_excl_x);
+  t.max_excl_y = wuffs_base__u32__min(r->max_excl_y, s.max_excl_y);
+  return t;
+}
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__rect_ie_u32__unite(const wuffs_base__rect_ie_u32* r,
+                               wuffs_base__rect_ie_u32 s) {
+  if (wuffs_base__rect_ie_u32__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__rect_ie_u32__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__rect_ie_u32 t;
+  t.min_incl_x = wuffs_base__u32__min(r->min_incl_x, s.min_incl_x);
+  t.min_incl_y = wuffs_base__u32__min(r->min_incl_y, s.min_incl_y);
+  t.max_excl_x = wuffs_base__u32__max(r->max_excl_x, s.max_excl_x);
+  t.max_excl_y = wuffs_base__u32__max(r->max_excl_y, s.max_excl_y);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__rect_ie_u32__contains(const wuffs_base__rect_ie_u32* r,
+                                  uint32_t x,
+                                  uint32_t y) {
+  return (r->min_incl_x <= x) && (x < r->max_excl_x) && (r->min_incl_y <= y) &&
+         (y < r->max_excl_y);
+}
+
+static inline bool  //
+wuffs_base__rect_ie_u32__contains_rect(const wuffs_base__rect_ie_u32* r,
+                                       wuffs_base__rect_ie_u32 s) {
+  return wuffs_base__rect_ie_u32__equals(
+      &s, wuffs_base__rect_ie_u32__intersect(r, s));
+}
+
+static inline uint32_t  //
+wuffs_base__rect_ie_u32__width(const wuffs_base__rect_ie_u32* r) {
+  return wuffs_base__u32__sat_sub(r->max_excl_x, r->min_incl_x);
+}
+
+static inline uint32_t  //
+wuffs_base__rect_ie_u32__height(const wuffs_base__rect_ie_u32* r) {
+  return wuffs_base__u32__sat_sub(r->max_excl_y, r->min_incl_y);
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__rect_ie_u32::is_empty() const {
+  return wuffs_base__rect_ie_u32__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__rect_ie_u32::equals(wuffs_base__rect_ie_u32 s) const {
+  return wuffs_base__rect_ie_u32__equals(this, s);
+}
+
+inline wuffs_base__rect_ie_u32  //
+wuffs_base__rect_ie_u32::intersect(wuffs_base__rect_ie_u32 s) const {
+  return wuffs_base__rect_ie_u32__intersect(this, s);
+}
+
+inline wuffs_base__rect_ie_u32  //
+wuffs_base__rect_ie_u32::unite(wuffs_base__rect_ie_u32 s) const {
+  return wuffs_base__rect_ie_u32__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__rect_ie_u32::contains(uint32_t x, uint32_t y) const {
+  return wuffs_base__rect_ie_u32__contains(this, x, y);
+}
+
+inline bool  //
+wuffs_base__rect_ie_u32::contains_rect(wuffs_base__rect_ie_u32 s) const {
+  return wuffs_base__rect_ie_u32__contains_rect(this, s);
+}
+
+inline uint32_t  //
+wuffs_base__rect_ie_u32::width() const {
+  return wuffs_base__rect_ie_u32__width(this);
+}
+
+inline uint32_t  //
+wuffs_base__rect_ie_u32::height() const {
+  return wuffs_base__rect_ie_u32__height(this);
+}
+
+#endif  // __cplusplus
+
+// ---------------- I/O
+//
+// See (/doc/note/io-input-output.md).
+
+// wuffs_base__io_buffer_meta is the metadata for a wuffs_base__io_buffer's
+// data.
+typedef struct {
+  size_t wi;     // Write index. Invariant: wi <= len.
+  size_t ri;     // Read  index. Invariant: ri <= wi.
+  uint64_t pos;  // Position of the buffer start relative to the stream start.
+  bool closed;   // No further writes are expected.
+} wuffs_base__io_buffer_meta;
+
+// wuffs_base__io_buffer is a 1-dimensional buffer (a pointer and length) plus
+// additional metadata.
+//
+// A value with all fields zero is a valid, empty buffer.
+typedef struct {
+  wuffs_base__slice_u8 data;
+  wuffs_base__io_buffer_meta meta;
+
+#ifdef __cplusplus
+  inline void compact();
+  inline uint64_t reader_available() const;
+  inline uint64_t reader_io_position() const;
+  inline uint64_t writer_available() const;
+  inline uint64_t writer_io_position() const;
+#endif  // __cplusplus
+
+} wuffs_base__io_buffer;
+
+static inline wuffs_base__io_buffer  //
+wuffs_base__make_io_buffer(wuffs_base__slice_u8 data,
+                           wuffs_base__io_buffer_meta meta) {
+  wuffs_base__io_buffer ret;
+  ret.data = data;
+  ret.meta = meta;
+  return ret;
+}
+
+static inline wuffs_base__io_buffer_meta  //
+wuffs_base__make_io_buffer_meta(size_t wi,
+                                size_t ri,
+                                uint64_t pos,
+                                bool closed) {
+  wuffs_base__io_buffer_meta ret;
+  ret.wi = wi;
+  ret.ri = ri;
+  ret.pos = pos;
+  ret.closed = closed;
+  return ret;
+}
+
+static inline wuffs_base__io_buffer  //
+wuffs_base__empty_io_buffer() {
+  wuffs_base__io_buffer ret;
+  ret.data.ptr = NULL;
+  ret.data.len = 0;
+  ret.meta.wi = 0;
+  ret.meta.ri = 0;
+  ret.meta.pos = 0;
+  ret.meta.closed = false;
+  return ret;
+}
+
+static inline wuffs_base__io_buffer_meta  //
+wuffs_base__empty_io_buffer_meta() {
+  wuffs_base__io_buffer_meta ret;
+  ret.wi = 0;
+  ret.ri = 0;
+  ret.pos = 0;
+  ret.closed = false;
+  return ret;
+}
+
+// wuffs_base__io_buffer__compact moves any written but unread bytes to the
+// start of the buffer.
+static inline void  //
+wuffs_base__io_buffer__compact(wuffs_base__io_buffer* buf) {
+  if (!buf || (buf->meta.ri == 0)) {
+    return;
+  }
+  buf->meta.pos = wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri);
+  size_t n = buf->meta.wi - buf->meta.ri;
+  if (n != 0) {
+    memmove(buf->data.ptr, buf->data.ptr + buf->meta.ri, n);
+  }
+  buf->meta.wi = n;
+  buf->meta.ri = 0;
+}
+
+static inline uint64_t  //
+wuffs_base__io_buffer__reader_available(const wuffs_base__io_buffer* buf) {
+  return buf ? buf->meta.wi - buf->meta.ri : 0;
+}
+
+static inline uint64_t  //
+wuffs_base__io_buffer__reader_io_position(const wuffs_base__io_buffer* buf) {
+  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri) : 0;
+}
+
+static inline uint64_t  //
+wuffs_base__io_buffer__writer_available(const wuffs_base__io_buffer* buf) {
+  return buf ? buf->data.len - buf->meta.wi : 0;
+}
+
+static inline uint64_t  //
+wuffs_base__io_buffer__writer_io_position(const wuffs_base__io_buffer* buf) {
+  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.wi) : 0;
+}
+
+#ifdef __cplusplus
+
+inline void  //
+wuffs_base__io_buffer::compact() {
+  wuffs_base__io_buffer__compact(this);
+}
+
+inline uint64_t  //
+wuffs_base__io_buffer::reader_available() const {
+  return wuffs_base__io_buffer__reader_available(this);
+}
+
+inline uint64_t  //
+wuffs_base__io_buffer::reader_io_position() const {
+  return wuffs_base__io_buffer__reader_io_position(this);
+}
+
+inline uint64_t  //
+wuffs_base__io_buffer::writer_available() const {
+  return wuffs_base__io_buffer__writer_available(this);
+}
+
+inline uint64_t  //
+wuffs_base__io_buffer::writer_io_position() const {
+  return wuffs_base__io_buffer__writer_io_position(this);
+}
+
+#endif  // __cplusplus
+
+// ---------------- Memory Allocation
+
+// The memory allocation related functions in this section aren't used by Wuffs
+// per se, but they may be helpful to the code that uses Wuffs.
+
+// wuffs_base__malloc_slice_uxx wraps calling a malloc-like function, except
+// that it takes a uint64_t number of elements instead of a size_t size in
+// bytes, and it returns a slice (a pointer and a length) instead of just a
+// pointer.
+//
+// You can pass the C stdlib's malloc as the malloc_func.
+//
+// It returns an empty slice (containing a NULL ptr field) if (num_uxx *
+// sizeof(uintxx_t)) would overflow SIZE_MAX.
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__malloc_slice_u8(void* (*malloc_func)(size_t), uint64_t num_u8) {
+  if (malloc_func && (num_u8 <= (SIZE_MAX / sizeof(uint8_t)))) {
+    void* p = (*malloc_func)(num_u8 * sizeof(uint8_t));
+    if (p) {
+      return wuffs_base__make_slice_u8((uint8_t*)(p), num_u8);
+    }
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+static inline wuffs_base__slice_u16  //
+wuffs_base__malloc_slice_u16(void* (*malloc_func)(size_t), uint64_t num_u16) {
+  if (malloc_func && (num_u16 <= (SIZE_MAX / sizeof(uint16_t)))) {
+    void* p = (*malloc_func)(num_u16 * sizeof(uint16_t));
+    if (p) {
+      return wuffs_base__make_slice_u16((uint16_t*)(p), num_u16);
+    }
+  }
+  return wuffs_base__make_slice_u16(NULL, 0);
+}
+
+static inline wuffs_base__slice_u32  //
+wuffs_base__malloc_slice_u32(void* (*malloc_func)(size_t), uint64_t num_u32) {
+  if (malloc_func && (num_u32 <= (SIZE_MAX / sizeof(uint32_t)))) {
+    void* p = (*malloc_func)(num_u32 * sizeof(uint32_t));
+    if (p) {
+      return wuffs_base__make_slice_u32((uint32_t*)(p), num_u32);
+    }
+  }
+  return wuffs_base__make_slice_u32(NULL, 0);
+}
+
+static inline wuffs_base__slice_u64  //
+wuffs_base__malloc_slice_u64(void* (*malloc_func)(size_t), uint64_t num_u64) {
+  if (malloc_func && (num_u64 <= (SIZE_MAX / sizeof(uint64_t)))) {
+    void* p = (*malloc_func)(num_u64 * sizeof(uint64_t));
+    if (p) {
+      return wuffs_base__make_slice_u64((uint64_t*)(p), num_u64);
+    }
+  }
+  return wuffs_base__make_slice_u64(NULL, 0);
+}
+
+// ---------------- Images
+
+// wuffs_base__color_u32_argb_premul is an 8 bit per channel premultiplied
+// Alpha, Red, Green, Blue color, as a uint32_t value. It is in word order, not
+// byte order: its value is always 0xAARRGGBB, regardless of endianness.
+typedef uint32_t wuffs_base__color_u32_argb_premul;
+
+// --------
+
+// wuffs_base__pixel_format encodes the format of the bytes that constitute an
+// image frame's pixel data.
+//
+// See https://github.com/google/wuffs/blob/master/doc/note/pixel-formats.md
+//
+// Do not manipulate its bits directly; they are private implementation
+// details. Use methods such as wuffs_base__pixel_format__num_planes instead.
+typedef uint32_t wuffs_base__pixel_format;
+
+// Common 8-bit-depth pixel formats. This list is not exhaustive; not all valid
+// wuffs_base__pixel_format values are present.
+
+#define WUFFS_BASE__PIXEL_FORMAT__INVALID ((wuffs_base__pixel_format)0x00000000)
+
+#define WUFFS_BASE__PIXEL_FORMAT__A ((wuffs_base__pixel_format)0x02000008)
+
+#define WUFFS_BASE__PIXEL_FORMAT__Y ((wuffs_base__pixel_format)0x10000008)
+#define WUFFS_BASE__PIXEL_FORMAT__YA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x15000008)
+#define WUFFS_BASE__PIXEL_FORMAT__YA_PREMUL \
+  ((wuffs_base__pixel_format)0x16000008)
+
+#define WUFFS_BASE__PIXEL_FORMAT__YCBCR ((wuffs_base__pixel_format)0x20020888)
+#define WUFFS_BASE__PIXEL_FORMAT__YCBCRK ((wuffs_base__pixel_format)0x21038888)
+#define WUFFS_BASE__PIXEL_FORMAT__YCBCRA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x25038888)
+
+#define WUFFS_BASE__PIXEL_FORMAT__YCOCG ((wuffs_base__pixel_format)0x30020888)
+#define WUFFS_BASE__PIXEL_FORMAT__YCOCGK ((wuffs_base__pixel_format)0x31038888)
+#define WUFFS_BASE__PIXEL_FORMAT__YCOCGA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x35038888)
+
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x45040008)
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL \
+  ((wuffs_base__pixel_format)0x46040008)
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY \
+  ((wuffs_base__pixel_format)0x47040008)
+
+#define WUFFS_BASE__PIXEL_FORMAT__BGR ((wuffs_base__pixel_format)0x40000888)
+#define WUFFS_BASE__PIXEL_FORMAT__BGRX ((wuffs_base__pixel_format)0x41008888)
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x45008888)
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL \
+  ((wuffs_base__pixel_format)0x46008888)
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY \
+  ((wuffs_base__pixel_format)0x47008888)
+
+#define WUFFS_BASE__PIXEL_FORMAT__RGB ((wuffs_base__pixel_format)0x50000888)
+#define WUFFS_BASE__PIXEL_FORMAT__RGBX ((wuffs_base__pixel_format)0x51008888)
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL \
+  ((wuffs_base__pixel_format)0x55008888)
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL \
+  ((wuffs_base__pixel_format)0x56008888)
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY \
+  ((wuffs_base__pixel_format)0x57008888)
+
+#define WUFFS_BASE__PIXEL_FORMAT__CMY ((wuffs_base__pixel_format)0x60020888)
+#define WUFFS_BASE__PIXEL_FORMAT__CMYK ((wuffs_base__pixel_format)0x61038888)
+
+extern const uint32_t wuffs_base__pixel_format__bits_per_channel[16];
+
+static inline bool  //
+wuffs_base__pixel_format__is_valid(wuffs_base__pixel_format f) {
+  return f != 0;
+}
+
+// wuffs_base__pixel_format__bits_per_pixel returns the number of bits per
+// pixel for interleaved pixel formats, and returns 0 for planar pixel formats.
+static inline uint32_t  //
+wuffs_base__pixel_format__bits_per_pixel(wuffs_base__pixel_format f) {
+  if (((f >> 16) & 0x03) != 0) {
+    return 0;
+  }
+  return wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 0)] +
+         wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 4)] +
+         wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 8)] +
+         wuffs_base__pixel_format__bits_per_channel[0x0F & (f >> 12)];
+}
+
+static inline bool  //
+wuffs_base__pixel_format__is_indexed(wuffs_base__pixel_format f) {
+  return (f >> 18) & 0x01;
+}
+
+static inline bool  //
+wuffs_base__pixel_format__is_interleaved(wuffs_base__pixel_format f) {
+  return ((f >> 16) & 0x03) == 0;
+}
+
+static inline bool  //
+wuffs_base__pixel_format__is_planar(wuffs_base__pixel_format f) {
+  return ((f >> 16) & 0x03) != 0;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_format__num_planes(wuffs_base__pixel_format f) {
+  return ((f >> 16) & 0x03) + 1;
+}
+
+#define WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX 4
+
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__INDEX_PLANE 0
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE 3
+
+// --------
+
+// wuffs_base__pixel_subsampling encodes whether sample values cover one pixel
+// or cover multiple pixels.
+//
+// See https://github.com/google/wuffs/blob/master/doc/note/pixel-subsampling.md
+//
+// Do not manipulate its bits directly; they are private implementation
+// details. Use methods such as wuffs_base__pixel_subsampling__bias_x instead.
+typedef uint32_t wuffs_base__pixel_subsampling;
+
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__NONE ((wuffs_base__pixel_subsampling)0)
+
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__444 \
+  ((wuffs_base__pixel_subsampling)0x000000)
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__440 \
+  ((wuffs_base__pixel_subsampling)0x010100)
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__422 \
+  ((wuffs_base__pixel_subsampling)0x101000)
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__420 \
+  ((wuffs_base__pixel_subsampling)0x111100)
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__411 \
+  ((wuffs_base__pixel_subsampling)0x303000)
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__410 \
+  ((wuffs_base__pixel_subsampling)0x313100)
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__bias_x(wuffs_base__pixel_subsampling s,
+                                      uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 6;
+  return (s >> shift) & 0x03;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__denominator_x(wuffs_base__pixel_subsampling s,
+                                             uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 4;
+  return ((s >> shift) & 0x03) + 1;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__bias_y(wuffs_base__pixel_subsampling s,
+                                      uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 2;
+  return (s >> shift) & 0x03;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__denominator_y(wuffs_base__pixel_subsampling s,
+                                             uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 0;
+  return ((s >> shift) & 0x03) + 1;
+}
+
+// --------
+
+typedef struct {
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    wuffs_base__pixel_format pixfmt;
+    wuffs_base__pixel_subsampling pixsub;
+    uint32_t width;
+    uint32_t height;
+  } private_impl;
+
+#ifdef __cplusplus
+  inline void set(wuffs_base__pixel_format pixfmt,
+                  wuffs_base__pixel_subsampling pixsub,
+                  uint32_t width,
+                  uint32_t height);
+  inline void invalidate();
+  inline bool is_valid() const;
+  inline wuffs_base__pixel_format pixel_format() const;
+  inline wuffs_base__pixel_subsampling pixel_subsampling() const;
+  inline wuffs_base__rect_ie_u32 bounds() const;
+  inline uint32_t width() const;
+  inline uint32_t height() const;
+  inline uint64_t pixbuf_len() const;
+#endif  // __cplusplus
+
+} wuffs_base__pixel_config;
+
+static inline wuffs_base__pixel_config  //
+wuffs_base__null_pixel_config() {
+  wuffs_base__pixel_config ret;
+  ret.private_impl.pixfmt = 0;
+  ret.private_impl.pixsub = 0;
+  ret.private_impl.width = 0;
+  ret.private_impl.height = 0;
+  return ret;
+}
+
+// TODO: Should this function return bool? An error type?
+static inline void  //
+wuffs_base__pixel_config__set(wuffs_base__pixel_config* c,
+                              wuffs_base__pixel_format pixfmt,
+                              wuffs_base__pixel_subsampling pixsub,
+                              uint32_t width,
+                              uint32_t height) {
+  if (!c) {
+    return;
+  }
+  if (pixfmt) {
+    uint64_t wh = ((uint64_t)width) * ((uint64_t)height);
+    // TODO: handle things other than 1 byte per pixel.
+    if (wh <= ((uint64_t)SIZE_MAX)) {
+      c->private_impl.pixfmt = pixfmt;
+      c->private_impl.pixsub = pixsub;
+      c->private_impl.width = width;
+      c->private_impl.height = height;
+      return;
+    }
+  }
+
+  c->private_impl.pixfmt = 0;
+  c->private_impl.pixsub = 0;
+  c->private_impl.width = 0;
+  c->private_impl.height = 0;
+}
+
+static inline void  //
+wuffs_base__pixel_config__invalidate(wuffs_base__pixel_config* c) {
+  if (c) {
+    c->private_impl.pixfmt = 0;
+    c->private_impl.pixsub = 0;
+    c->private_impl.width = 0;
+    c->private_impl.height = 0;
+  }
+}
+
+static inline bool  //
+wuffs_base__pixel_config__is_valid(const wuffs_base__pixel_config* c) {
+  return c && c->private_impl.pixfmt;
+}
+
+static inline wuffs_base__pixel_format  //
+wuffs_base__pixel_config__pixel_format(const wuffs_base__pixel_config* c) {
+  return c ? c->private_impl.pixfmt : 0;
+}
+
+static inline wuffs_base__pixel_subsampling  //
+wuffs_base__pixel_config__pixel_subsampling(const wuffs_base__pixel_config* c) {
+  return c ? c->private_impl.pixsub : 0;
+}
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__pixel_config__bounds(const wuffs_base__pixel_config* c) {
+  if (c) {
+    wuffs_base__rect_ie_u32 ret;
+    ret.min_incl_x = 0;
+    ret.min_incl_y = 0;
+    ret.max_excl_x = c->private_impl.width;
+    ret.max_excl_y = c->private_impl.height;
+    return ret;
+  }
+
+  wuffs_base__rect_ie_u32 ret;
+  ret.min_incl_x = 0;
+  ret.min_incl_y = 0;
+  ret.max_excl_x = 0;
+  ret.max_excl_y = 0;
+  return ret;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_config__width(const wuffs_base__pixel_config* c) {
+  return c ? c->private_impl.width : 0;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_config__height(const wuffs_base__pixel_config* c) {
+  return c ? c->private_impl.height : 0;
+}
+
+// TODO: this is the right API for planar (not interleaved) pixbufs? Should it
+// allow decoding into a color model different from the format's intrinsic one?
+// For example, decoding a JPEG image straight to RGBA instead of to YCbCr?
+static inline uint64_t  //
+wuffs_base__pixel_config__pixbuf_len(const wuffs_base__pixel_config* c) {
+  if (!c) {
+    return 0;
+  }
+  if (wuffs_base__pixel_format__is_planar(c->private_impl.pixfmt)) {
+    // TODO: support planar pixel formats, concious of pixel subsampling.
+    return 0;
+  }
+  uint32_t bits_per_pixel =
+      wuffs_base__pixel_format__bits_per_pixel(c->private_impl.pixfmt);
+  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
+    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
+    return 0;
+  }
+  uint64_t bytes_per_pixel = bits_per_pixel / 8;
+
+  uint64_t n =
+      ((uint64_t)c->private_impl.width) * ((uint64_t)c->private_impl.height);
+  if (n > (UINT64_MAX / bytes_per_pixel)) {
+    return 0;
+  }
+  n *= bytes_per_pixel;
+
+  if (wuffs_base__pixel_format__is_indexed(c->private_impl.pixfmt)) {
+    if (n > (UINT64_MAX - 1024)) {
+      return 0;
+    }
+    n += 1024;
+  }
+
+  return n;
+}
+
+#ifdef __cplusplus
+
+inline void  //
+wuffs_base__pixel_config::set(wuffs_base__pixel_format pixfmt,
+                              wuffs_base__pixel_subsampling pixsub,
+                              uint32_t width,
+                              uint32_t height) {
+  wuffs_base__pixel_config__set(this, pixfmt, pixsub, width, height);
+}
+
+inline void  //
+wuffs_base__pixel_config::invalidate() {
+  wuffs_base__pixel_config__invalidate(this);
+}
+
+inline bool  //
+wuffs_base__pixel_config::is_valid() const {
+  return wuffs_base__pixel_config__is_valid(this);
+}
+
+inline wuffs_base__pixel_format  //
+wuffs_base__pixel_config::pixel_format() const {
+  return wuffs_base__pixel_config__pixel_format(this);
+}
+
+inline wuffs_base__pixel_subsampling  //
+wuffs_base__pixel_config::pixel_subsampling() const {
+  return wuffs_base__pixel_config__pixel_subsampling(this);
+}
+
+inline wuffs_base__rect_ie_u32  //
+wuffs_base__pixel_config::bounds() const {
+  return wuffs_base__pixel_config__bounds(this);
+}
+
+inline uint32_t  //
+wuffs_base__pixel_config::width() const {
+  return wuffs_base__pixel_config__width(this);
+}
+
+inline uint32_t  //
+wuffs_base__pixel_config::height() const {
+  return wuffs_base__pixel_config__height(this);
+}
+
+inline uint64_t  //
+wuffs_base__pixel_config::pixbuf_len() const {
+  return wuffs_base__pixel_config__pixbuf_len(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct {
+  wuffs_base__pixel_config pixcfg;
+
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    uint64_t first_frame_io_position;
+    bool first_frame_is_opaque;
+  } private_impl;
+
+#ifdef __cplusplus
+  inline void set(wuffs_base__pixel_format pixfmt,
+                  wuffs_base__pixel_subsampling pixsub,
+                  uint32_t width,
+                  uint32_t height,
+                  uint64_t first_frame_io_position,
+                  bool first_frame_is_opaque);
+  inline void invalidate();
+  inline bool is_valid() const;
+  inline uint64_t first_frame_io_position() const;
+  inline bool first_frame_is_opaque() const;
+#endif  // __cplusplus
+
+} wuffs_base__image_config;
+
+static inline wuffs_base__image_config  //
+wuffs_base__null_image_config() {
+  wuffs_base__image_config ret;
+  ret.pixcfg = wuffs_base__null_pixel_config();
+  ret.private_impl.first_frame_io_position = 0;
+  ret.private_impl.first_frame_is_opaque = false;
+  return ret;
+}
+
+// TODO: Should this function return bool? An error type?
+static inline void  //
+wuffs_base__image_config__set(wuffs_base__image_config* c,
+                              wuffs_base__pixel_format pixfmt,
+                              wuffs_base__pixel_subsampling pixsub,
+                              uint32_t width,
+                              uint32_t height,
+                              uint64_t first_frame_io_position,
+                              bool first_frame_is_opaque) {
+  if (!c) {
+    return;
+  }
+  if (wuffs_base__pixel_format__is_valid(pixfmt)) {
+    c->pixcfg.private_impl.pixfmt = pixfmt;
+    c->pixcfg.private_impl.pixsub = pixsub;
+    c->pixcfg.private_impl.width = width;
+    c->pixcfg.private_impl.height = height;
+    c->private_impl.first_frame_io_position = first_frame_io_position;
+    c->private_impl.first_frame_is_opaque = first_frame_is_opaque;
+    return;
+  }
+
+  c->pixcfg.private_impl.pixfmt = 0;
+  c->pixcfg.private_impl.pixsub = 0;
+  c->pixcfg.private_impl.width = 0;
+  c->pixcfg.private_impl.height = 0;
+  c->private_impl.first_frame_io_position = 0;
+  c->private_impl.first_frame_is_opaque = 0;
+}
+
+static inline void  //
+wuffs_base__image_config__invalidate(wuffs_base__image_config* c) {
+  if (c) {
+    c->pixcfg.private_impl.pixfmt = 0;
+    c->pixcfg.private_impl.pixsub = 0;
+    c->pixcfg.private_impl.width = 0;
+    c->pixcfg.private_impl.height = 0;
+    c->private_impl.first_frame_io_position = 0;
+    c->private_impl.first_frame_is_opaque = 0;
+  }
+}
+
+static inline bool  //
+wuffs_base__image_config__is_valid(const wuffs_base__image_config* c) {
+  return c && wuffs_base__pixel_config__is_valid(&(c->pixcfg));
+}
+
+static inline uint64_t  //
+wuffs_base__image_config__first_frame_io_position(
+    const wuffs_base__image_config* c) {
+  return c ? c->private_impl.first_frame_io_position : 0;
+}
+
+static inline bool  //
+wuffs_base__image_config__first_frame_is_opaque(
+    const wuffs_base__image_config* c) {
+  return c ? c->private_impl.first_frame_is_opaque : false;
+}
+
+#ifdef __cplusplus
+
+inline void  //
+wuffs_base__image_config::set(wuffs_base__pixel_format pixfmt,
+                              wuffs_base__pixel_subsampling pixsub,
+                              uint32_t width,
+                              uint32_t height,
+                              uint64_t first_frame_io_position,
+                              bool first_frame_is_opaque) {
+  wuffs_base__image_config__set(this, pixfmt, pixsub, width, height,
+                                first_frame_io_position, first_frame_is_opaque);
+}
+
+inline void  //
+wuffs_base__image_config::invalidate() {
+  wuffs_base__image_config__invalidate(this);
+}
+
+inline bool  //
+wuffs_base__image_config::is_valid() const {
+  return wuffs_base__image_config__is_valid(this);
+}
+
+inline uint64_t  //
+wuffs_base__image_config::first_frame_io_position() const {
+  return wuffs_base__image_config__first_frame_io_position(this);
+}
+
+inline bool  //
+wuffs_base__image_config::first_frame_is_opaque() const {
+  return wuffs_base__image_config__first_frame_is_opaque(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+// wuffs_base__animation_blend encodes, for an animated image, how to blend the
+// transparent pixels of this frame with the existing canvas. In Porter-Duff
+// compositing operator terminology:
+//  - 0 means the frame may be transparent, and should be blended "src over
+//    dst", also known as just "over".
+//  - 1 means the frame may be transparent, and should be blended "src".
+//  - 2 means the frame is completely opaque, so that "src over dst" and "src"
+//    are equivalent.
+//
+// These semantics are conservative. It is valid for a completely opaque frame
+// to have a blend value other than 2.
+typedef uint8_t wuffs_base__animation_blend;
+
+#define WUFFS_BASE__ANIMATION_BLEND__SRC_OVER_DST \
+  ((wuffs_base__animation_blend)0)
+#define WUFFS_BASE__ANIMATION_BLEND__SRC ((wuffs_base__animation_blend)1)
+#define WUFFS_BASE__ANIMATION_BLEND__OPAQUE ((wuffs_base__animation_blend)2)
+
+// --------
+
+// wuffs_base__animation_disposal encodes, for an animated image, how to
+// dispose of a frame after displaying it:
+//  - None means to draw the next frame on top of this one.
+//  - Restore Background means to clear the frame's dirty rectangle to "the
+//    background color" (in practice, this means transparent black) before
+//    drawing the next frame.
+//  - Restore Previous means to undo the current frame, so that the next frame
+//    is drawn on top of the previous one.
+typedef uint8_t wuffs_base__animation_disposal;
+
+#define WUFFS_BASE__ANIMATION_DISPOSAL__NONE ((wuffs_base__animation_disposal)0)
+#define WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_BACKGROUND \
+  ((wuffs_base__animation_disposal)1)
+#define WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_PREVIOUS \
+  ((wuffs_base__animation_disposal)2)
+
+// --------
+
+typedef struct {
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    wuffs_base__rect_ie_u32 bounds;
+    wuffs_base__flicks duration;
+    uint64_t index;
+    uint64_t io_position;
+    wuffs_base__animation_blend blend;
+    wuffs_base__animation_disposal disposal;
+    wuffs_base__color_u32_argb_premul background_color;
+  } private_impl;
+
+#ifdef __cplusplus
+  inline void update(wuffs_base__rect_ie_u32 bounds,
+                     wuffs_base__flicks duration,
+                     uint64_t index,
+                     uint64_t io_position,
+                     wuffs_base__animation_blend blend,
+                     wuffs_base__animation_disposal disposal,
+                     wuffs_base__color_u32_argb_premul background_color);
+  inline wuffs_base__rect_ie_u32 bounds() const;
+  inline uint32_t width() const;
+  inline uint32_t height() const;
+  inline wuffs_base__flicks duration() const;
+  inline uint64_t index() const;
+  inline uint64_t io_position() const;
+  inline wuffs_base__animation_blend blend() const;
+  inline wuffs_base__animation_disposal disposal() const;
+  inline wuffs_base__color_u32_argb_premul background_color() const;
+#endif  // __cplusplus
+
+} wuffs_base__frame_config;
+
+static inline wuffs_base__frame_config  //
+wuffs_base__null_frame_config() {
+  wuffs_base__frame_config ret;
+  ret.private_impl.bounds = wuffs_base__make_rect_ie_u32(0, 0, 0, 0);
+  ret.private_impl.duration = 0;
+  ret.private_impl.index = 0;
+  ret.private_impl.io_position = 0;
+  ret.private_impl.blend = 0;
+  ret.private_impl.disposal = 0;
+  return ret;
+}
+
+static inline void  //
+wuffs_base__frame_config__update(
+    wuffs_base__frame_config* c,
+    wuffs_base__rect_ie_u32 bounds,
+    wuffs_base__flicks duration,
+    uint64_t index,
+    uint64_t io_position,
+    wuffs_base__animation_blend blend,
+    wuffs_base__animation_disposal disposal,
+    wuffs_base__color_u32_argb_premul background_color) {
+  if (!c) {
+    return;
+  }
+
+  c->private_impl.bounds = bounds;
+  c->private_impl.duration = duration;
+  c->private_impl.index = index;
+  c->private_impl.io_position = io_position;
+  c->private_impl.blend = blend;
+  c->private_impl.disposal = disposal;
+  c->private_impl.background_color = background_color;
+}
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__frame_config__bounds(const wuffs_base__frame_config* c) {
+  if (c) {
+    return c->private_impl.bounds;
+  }
+
+  wuffs_base__rect_ie_u32 ret;
+  ret.min_incl_x = 0;
+  ret.min_incl_y = 0;
+  ret.max_excl_x = 0;
+  ret.max_excl_y = 0;
+  return ret;
+}
+
+static inline uint32_t  //
+wuffs_base__frame_config__width(const wuffs_base__frame_config* c) {
+  return c ? wuffs_base__rect_ie_u32__width(&c->private_impl.bounds) : 0;
+}
+
+static inline uint32_t  //
+wuffs_base__frame_config__height(const wuffs_base__frame_config* c) {
+  return c ? wuffs_base__rect_ie_u32__height(&c->private_impl.bounds) : 0;
+}
+
+// wuffs_base__frame_config__duration returns the amount of time to display
+// this frame. Zero means to display forever - a still (non-animated) image.
+static inline wuffs_base__flicks  //
+wuffs_base__frame_config__duration(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.duration : 0;
+}
+
+// wuffs_base__frame_config__index returns the index of this frame. The first
+// frame in an image has index 0, the second frame has index 1, and so on.
+static inline uint64_t  //
+wuffs_base__frame_config__index(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.index : 0;
+}
+
+// wuffs_base__frame_config__io_position returns the I/O stream position before
+// the frame config.
+static inline uint64_t  //
+wuffs_base__frame_config__io_position(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.io_position : 0;
+}
+
+// wuffs_base__frame_config__blend returns, for an animated image, how to blend
+// the transparent pixels of this frame with the existing canvas.
+static inline wuffs_base__animation_blend  //
+wuffs_base__frame_config__blend(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.blend : 0;
+}
+
+// wuffs_base__frame_config__disposal returns, for an animated image, how to
+// dispose of this frame after displaying it.
+static inline wuffs_base__animation_disposal  //
+wuffs_base__frame_config__disposal(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.disposal : 0;
+}
+
+static inline wuffs_base__color_u32_argb_premul  //
+wuffs_base__frame_config__background_color(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.background_color : 0;
+}
+
+#ifdef __cplusplus
+
+inline void  //
+wuffs_base__frame_config::update(
+    wuffs_base__rect_ie_u32 bounds,
+    wuffs_base__flicks duration,
+    uint64_t index,
+    uint64_t io_position,
+    wuffs_base__animation_blend blend,
+    wuffs_base__animation_disposal disposal,
+    wuffs_base__color_u32_argb_premul background_color) {
+  wuffs_base__frame_config__update(this, bounds, duration, index, io_position,
+                                   blend, disposal, background_color);
+}
+
+inline wuffs_base__rect_ie_u32  //
+wuffs_base__frame_config::bounds() const {
+  return wuffs_base__frame_config__bounds(this);
+}
+
+inline uint32_t  //
+wuffs_base__frame_config::width() const {
+  return wuffs_base__frame_config__width(this);
+}
+
+inline uint32_t  //
+wuffs_base__frame_config::height() const {
+  return wuffs_base__frame_config__height(this);
+}
+
+inline wuffs_base__flicks  //
+wuffs_base__frame_config::duration() const {
+  return wuffs_base__frame_config__duration(this);
+}
+
+inline uint64_t  //
+wuffs_base__frame_config::index() const {
+  return wuffs_base__frame_config__index(this);
+}
+
+inline uint64_t  //
+wuffs_base__frame_config::io_position() const {
+  return wuffs_base__frame_config__io_position(this);
+}
+
+inline wuffs_base__animation_blend  //
+wuffs_base__frame_config::blend() const {
+  return wuffs_base__frame_config__blend(this);
+}
+
+inline wuffs_base__animation_disposal  //
+wuffs_base__frame_config::disposal() const {
+  return wuffs_base__frame_config__disposal(this);
+}
+
+inline wuffs_base__color_u32_argb_premul  //
+wuffs_base__frame_config::background_color() const {
+  return wuffs_base__frame_config__background_color(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct {
+  wuffs_base__pixel_config pixcfg;
+
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    wuffs_base__table_u8 planes[WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX];
+    // TODO: color spaces.
+  } private_impl;
+
+#ifdef __cplusplus
+  inline wuffs_base__status set_from_slice(
+      const wuffs_base__pixel_config* pixcfg,
+      wuffs_base__slice_u8 pixbuf_memory);
+  inline wuffs_base__status set_from_table(
+      const wuffs_base__pixel_config* pixcfg,
+      wuffs_base__table_u8 pixbuf_memory);
+  inline wuffs_base__slice_u8 palette();
+  inline wuffs_base__pixel_format pixel_format() const;
+  inline wuffs_base__table_u8 plane(uint32_t p);
+#endif  // __cplusplus
+
+} wuffs_base__pixel_buffer;
+
+static inline wuffs_base__pixel_buffer  //
+wuffs_base__null_pixel_buffer() {
+  wuffs_base__pixel_buffer ret;
+  ret.pixcfg = wuffs_base__null_pixel_config();
+  ret.private_impl.planes[0] = wuffs_base__empty_table_u8();
+  ret.private_impl.planes[1] = wuffs_base__empty_table_u8();
+  ret.private_impl.planes[2] = wuffs_base__empty_table_u8();
+  ret.private_impl.planes[3] = wuffs_base__empty_table_u8();
+  return ret;
+}
+
+static inline wuffs_base__status  //
+wuffs_base__pixel_buffer__set_from_slice(wuffs_base__pixel_buffer* b,
+                                         const wuffs_base__pixel_config* pixcfg,
+                                         wuffs_base__slice_u8 pixbuf_memory) {
+  if (!b) {
+    return wuffs_base__error__bad_receiver;
+  }
+  memset(b, 0, sizeof(*b));
+  if (!pixcfg) {
+    return wuffs_base__error__bad_argument;
+  }
+  if (wuffs_base__pixel_format__is_planar(pixcfg->private_impl.pixfmt)) {
+    // TODO: support planar pixel formats, concious of pixel subsampling.
+    return wuffs_base__error__unsupported_option;
+  }
+  uint32_t bits_per_pixel =
+      wuffs_base__pixel_format__bits_per_pixel(pixcfg->private_impl.pixfmt);
+  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
+    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
+    return wuffs_base__error__unsupported_option;
+  }
+  uint64_t bytes_per_pixel = bits_per_pixel / 8;
+
+  uint8_t* ptr = pixbuf_memory.ptr;
+  uint64_t len = pixbuf_memory.len;
+  if (wuffs_base__pixel_format__is_indexed(pixcfg->private_impl.pixfmt)) {
+    // Split a 1024 byte chunk (256 palette entries × 4 bytes per entry) from
+    // the start of pixbuf_memory. We split from the start, not the end, so
+    // that the both chunks' pointers have the same alignment as the original
+    // pointer, up to an alignment of 1024.
+    if (len < 1024) {
+      return wuffs_base__error__bad_argument_length_too_short;
+    }
+    wuffs_base__table_u8* tab =
+        &b->private_impl.planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
+    tab->ptr = ptr;
+    tab->width = 1024;
+    tab->height = 1;
+    tab->stride = 1024;
+    ptr += 1024;
+    len -= 1024;
+  }
+
+  uint64_t wh = ((uint64_t)pixcfg->private_impl.width) *
+                ((uint64_t)pixcfg->private_impl.height);
+  size_t width = (size_t)(pixcfg->private_impl.width);
+  if ((wh > (UINT64_MAX / bytes_per_pixel)) ||
+      (width > (SIZE_MAX / bytes_per_pixel))) {
+    return wuffs_base__error__bad_argument;
+  }
+  wh *= bytes_per_pixel;
+  width *= bytes_per_pixel;
+  if (wh > len) {
+    return wuffs_base__error__bad_argument_length_too_short;
+  }
+
+  b->pixcfg = *pixcfg;
+  wuffs_base__table_u8* tab = &b->private_impl.planes[0];
+  tab->ptr = ptr;
+  tab->width = width;
+  tab->height = pixcfg->private_impl.height;
+  tab->stride = width;
+  return NULL;
+}
+
+static inline wuffs_base__status  //
+wuffs_base__pixel_buffer__set_from_table(wuffs_base__pixel_buffer* b,
+                                         const wuffs_base__pixel_config* pixcfg,
+                                         wuffs_base__table_u8 pixbuf_memory) {
+  if (!b) {
+    return wuffs_base__error__bad_receiver;
+  }
+  memset(b, 0, sizeof(*b));
+  if (!pixcfg ||
+      wuffs_base__pixel_format__is_planar(pixcfg->private_impl.pixfmt)) {
+    return wuffs_base__error__bad_argument;
+  }
+  uint32_t bits_per_pixel =
+      wuffs_base__pixel_format__bits_per_pixel(pixcfg->private_impl.pixfmt);
+  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
+    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
+    return wuffs_base__error__unsupported_option;
+  }
+  uint64_t bytes_per_pixel = bits_per_pixel / 8;
+
+  uint64_t width_in_bytes =
+      ((uint64_t)pixcfg->private_impl.width) * bytes_per_pixel;
+  if ((width_in_bytes > pixbuf_memory.width) ||
+      (pixcfg->private_impl.height > pixbuf_memory.height)) {
+    return wuffs_base__error__bad_argument;
+  }
+
+  b->pixcfg = *pixcfg;
+  b->private_impl.planes[0] = pixbuf_memory;
+  return NULL;
+}
+
+// wuffs_base__pixel_buffer__palette returns the palette color data. If
+// non-empty, it will have length 1024.
+static inline wuffs_base__slice_u8  //
+wuffs_base__pixel_buffer__palette(wuffs_base__pixel_buffer* b) {
+  if (b &&
+      wuffs_base__pixel_format__is_indexed(b->pixcfg.private_impl.pixfmt)) {
+    wuffs_base__table_u8* tab =
+        &b->private_impl.planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
+    if ((tab->width == 1024) && (tab->height == 1)) {
+      return wuffs_base__make_slice_u8(tab->ptr, 1024);
+    }
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+static inline wuffs_base__pixel_format  //
+wuffs_base__pixel_buffer__pixel_format(const wuffs_base__pixel_buffer* b) {
+  if (b) {
+    return b->pixcfg.private_impl.pixfmt;
+  }
+  return WUFFS_BASE__PIXEL_FORMAT__INVALID;
+}
+
+static inline wuffs_base__table_u8  //
+wuffs_base__pixel_buffer__plane(wuffs_base__pixel_buffer* b, uint32_t p) {
+  if (b && (p < WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX)) {
+    return b->private_impl.planes[p];
+  }
+
+  wuffs_base__table_u8 ret;
+  ret.ptr = NULL;
+  ret.width = 0;
+  ret.height = 0;
+  ret.stride = 0;
+  return ret;
+}
+
+#ifdef __cplusplus
+
+inline wuffs_base__status  //
+wuffs_base__pixel_buffer::set_from_slice(const wuffs_base__pixel_config* pixcfg,
+                                         wuffs_base__slice_u8 pixbuf_memory) {
+  return wuffs_base__pixel_buffer__set_from_slice(this, pixcfg, pixbuf_memory);
+}
+
+inline wuffs_base__status  //
+wuffs_base__pixel_buffer::set_from_table(const wuffs_base__pixel_config* pixcfg,
+                                         wuffs_base__table_u8 pixbuf_memory) {
+  return wuffs_base__pixel_buffer__set_from_table(this, pixcfg, pixbuf_memory);
+}
+
+inline wuffs_base__slice_u8  //
+wuffs_base__pixel_buffer::palette() {
+  return wuffs_base__pixel_buffer__palette(this);
+}
+
+inline wuffs_base__pixel_format  //
+wuffs_base__pixel_buffer::pixel_format() const {
+  return wuffs_base__pixel_buffer__pixel_format(this);
+}
+
+inline wuffs_base__table_u8  //
+wuffs_base__pixel_buffer::plane(uint32_t p) {
+  return wuffs_base__pixel_buffer__plane(this, p);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct {
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    uint8_t TODO;
+  } private_impl;
+
+#ifdef __cplusplus
+#endif  // __cplusplus
+
+} wuffs_base__decode_frame_options;
+
+#ifdef __cplusplus
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct {
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    // TODO: should the func type take restrict pointers?
+    uint64_t (*func)(wuffs_base__slice_u8 dst,
+                     wuffs_base__slice_u8 dst_palette,
+                     wuffs_base__slice_u8 src);
+  } private_impl;
+
+#ifdef __cplusplus
+  inline wuffs_base__status prepare(wuffs_base__pixel_format dst_format,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_format,
+                                    wuffs_base__slice_u8 src_palette);
+  inline uint64_t swizzle_interleaved(wuffs_base__slice_u8 dst,
+                                      wuffs_base__slice_u8 dst_palette,
+                                      wuffs_base__slice_u8 src) const;
+#endif  // __cplusplus
+
+} wuffs_base__pixel_swizzler;
+
+wuffs_base__status  //
+wuffs_base__pixel_swizzler__prepare(wuffs_base__pixel_swizzler* p,
+                                    wuffs_base__pixel_format dst_format,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_format,
+                                    wuffs_base__slice_u8 src_palette);
+
+uint64_t  //
+wuffs_base__pixel_swizzler__swizzle_interleaved(
+    const wuffs_base__pixel_swizzler* p,
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src);
+
+#ifdef __cplusplus
+
+inline wuffs_base__status  //
+wuffs_base__pixel_swizzler::prepare(wuffs_base__pixel_format dst_format,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_format,
+                                    wuffs_base__slice_u8 src_palette) {
+  return wuffs_base__pixel_swizzler__prepare(this, dst_format, dst_palette,
+                                             src_format, src_palette);
+}
+
+uint64_t  //
+wuffs_base__pixel_swizzler::swizzle_interleaved(
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src) const {
+  return wuffs_base__pixel_swizzler__swizzle_interleaved(this, dst, dst_palette,
+                                                         src);
+}
+
+#endif  // __cplusplus
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Status Codes
+
+// ---------------- Public Consts
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_adler32__hasher__struct wuffs_adler32__hasher;
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_adler32__hasher__initialize(wuffs_adler32__hasher* self,
+                                  size_t sizeof_star_self,
+                                  uint64_t wuffs_version,
+                                  uint32_t initialize_flags);
+
+size_t  //
+sizeof__wuffs_adler32__hasher();
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_adler32__hasher__update_u32(wuffs_adler32__hasher* self,
+                                  wuffs_base__slice_u8 a_x);
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_adler32__hasher__struct {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+
+    uint32_t f_state;
+    bool f_started;
+
+  } private_impl;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+  initialize(size_t sizeof_star_self,
+             uint64_t wuffs_version,
+             uint32_t initialize_flags) {
+    return wuffs_adler32__hasher__initialize(this, sizeof_star_self,
+                                             wuffs_version, initialize_flags);
+  }
+
+  inline uint32_t  //
+  update_u32(wuffs_base__slice_u8 a_x) {
+    return wuffs_adler32__hasher__update_u32(this, a_x);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_adler32__hasher__struct(const wuffs_adler32__hasher__struct&) = delete;
+  wuffs_adler32__hasher__struct& operator=(
+      const wuffs_adler32__hasher__struct&) = delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#endif  // __cplusplus
+
+};  // struct wuffs_adler32__hasher__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Status Codes
+
+// ---------------- Public Consts
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_crc32__ieee_hasher__struct wuffs_crc32__ieee_hasher;
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_crc32__ieee_hasher__initialize(wuffs_crc32__ieee_hasher* self,
+                                     size_t sizeof_star_self,
+                                     uint64_t wuffs_version,
+                                     uint32_t initialize_flags);
+
+size_t  //
+sizeof__wuffs_crc32__ieee_hasher();
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_crc32__ieee_hasher__update_u32(wuffs_crc32__ieee_hasher* self,
+                                     wuffs_base__slice_u8 a_x);
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_crc32__ieee_hasher__struct {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+
+    uint32_t f_state;
+
+  } private_impl;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+  initialize(size_t sizeof_star_self,
+             uint64_t wuffs_version,
+             uint32_t initialize_flags) {
+    return wuffs_crc32__ieee_hasher__initialize(
+        this, sizeof_star_self, wuffs_version, initialize_flags);
+  }
+
+  inline uint32_t  //
+  update_u32(wuffs_base__slice_u8 a_x) {
+    return wuffs_crc32__ieee_hasher__update_u32(this, a_x);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_crc32__ieee_hasher__struct(const wuffs_crc32__ieee_hasher__struct&) =
+      delete;
+  wuffs_crc32__ieee_hasher__struct& operator=(
+      const wuffs_crc32__ieee_hasher__struct&) = delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#endif  // __cplusplus
+
+};  // struct wuffs_crc32__ieee_hasher__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Status Codes
+
+extern const char* wuffs_deflate__error__bad_huffman_code_over_subscribed;
+extern const char* wuffs_deflate__error__bad_huffman_code_under_subscribed;
+extern const char* wuffs_deflate__error__bad_huffman_code_length_count;
+extern const char* wuffs_deflate__error__bad_huffman_code_length_repetition;
+extern const char* wuffs_deflate__error__bad_huffman_code;
+extern const char* wuffs_deflate__error__bad_huffman_minimum_code_length;
+extern const char* wuffs_deflate__error__bad_block;
+extern const char* wuffs_deflate__error__bad_distance;
+extern const char* wuffs_deflate__error__bad_distance_code_count;
+extern const char* wuffs_deflate__error__bad_literal_length_code_count;
+extern const char* wuffs_deflate__error__inconsistent_stored_block_length;
+extern const char* wuffs_deflate__error__missing_end_of_block_code;
+extern const char* wuffs_deflate__error__no_huffman_codes;
+
+// ---------------- Public Consts
+
+#define WUFFS_DEFLATE__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_deflate__decoder__struct wuffs_deflate__decoder;
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_deflate__decoder__initialize(wuffs_deflate__decoder* self,
+                                   size_t sizeof_star_self,
+                                   uint64_t wuffs_version,
+                                   uint32_t initialize_flags);
+
+size_t  //
+sizeof__wuffs_deflate__decoder();
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_deflate__decoder__add_history(wuffs_deflate__decoder* self,
+                                    wuffs_base__slice_u8 a_hist);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
+wuffs_deflate__decoder__workbuf_len(const wuffs_deflate__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_deflate__decoder__decode_io_writer(wuffs_deflate__decoder* self,
+                                         wuffs_base__io_buffer* a_dst,
+                                         wuffs_base__io_buffer* a_src,
+                                         wuffs_base__slice_u8 a_workbuf);
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_deflate__decoder__struct {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+
+    uint32_t f_bits;
+    uint32_t f_n_bits;
+    uint32_t f_history_index;
+    uint32_t f_n_huffs_bits[2];
+    bool f_end_of_block;
+
+    uint32_t p_decode_io_writer[1];
+    uint32_t p_decode_blocks[1];
+    uint32_t p_decode_uncompressed[1];
+    uint32_t p_init_dynamic_huffman[1];
+    uint32_t p_decode_huffman_slow[1];
+  } private_impl;
+
+  struct {
+    uint32_t f_huffs[2][1024];
+    uint8_t f_history[32768];
+    uint8_t f_code_lengths[320];
+
+    struct {
+      uint32_t v_final;
+    } s_decode_blocks[1];
+    struct {
+      uint32_t v_length;
+      uint64_t scratch;
+    } s_decode_uncompressed[1];
+    struct {
+      uint32_t v_bits;
+      uint32_t v_n_bits;
+      uint32_t v_n_lit;
+      uint32_t v_n_dist;
+      uint32_t v_n_clen;
+      uint32_t v_i;
+      uint32_t v_mask;
+      uint32_t v_table_entry;
+      uint32_t v_n_extra_bits;
+      uint8_t v_rep_symbol;
+      uint32_t v_rep_count;
+    } s_init_dynamic_huffman[1];
+    struct {
+      uint32_t v_bits;
+      uint32_t v_n_bits;
+      uint32_t v_table_entry;
+      uint32_t v_table_entry_n_bits;
+      uint32_t v_lmask;
+      uint32_t v_dmask;
+      uint32_t v_redir_top;
+      uint32_t v_redir_mask;
+      uint32_t v_length;
+      uint32_t v_dist_minus_1;
+      uint32_t v_hlen;
+      uint32_t v_hdist;
+    } s_decode_huffman_slow[1];
+  } private_data;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+  initialize(size_t sizeof_star_self,
+             uint64_t wuffs_version,
+             uint32_t initialize_flags) {
+    return wuffs_deflate__decoder__initialize(this, sizeof_star_self,
+                                              wuffs_version, initialize_flags);
+  }
+
+  inline wuffs_base__empty_struct  //
+  add_history(wuffs_base__slice_u8 a_hist) {
+    return wuffs_deflate__decoder__add_history(this, a_hist);
+  }
+
+  inline wuffs_base__range_ii_u64  //
+  workbuf_len() const {
+    return wuffs_deflate__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status  //
+  decode_io_writer(wuffs_base__io_buffer* a_dst,
+                   wuffs_base__io_buffer* a_src,
+                   wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_deflate__decoder__decode_io_writer(this, a_dst, a_src,
+                                                    a_workbuf);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_deflate__decoder__struct(const wuffs_deflate__decoder__struct&) =
+      delete;
+  wuffs_deflate__decoder__struct& operator=(
+      const wuffs_deflate__decoder__struct&) = delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#endif  // __cplusplus
+
+};  // struct wuffs_deflate__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Status Codes
+
+extern const char* wuffs_lzw__error__bad_code;
+
+// ---------------- Public Consts
+
+#define WUFFS_LZW__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_lzw__decoder__struct wuffs_lzw__decoder;
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_lzw__decoder__initialize(wuffs_lzw__decoder* self,
+                               size_t sizeof_star_self,
+                               uint64_t wuffs_version,
+                               uint32_t initialize_flags);
+
+size_t  //
+sizeof__wuffs_lzw__decoder();
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_lzw__decoder__set_literal_width(wuffs_lzw__decoder* self, uint32_t a_lw);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
+wuffs_lzw__decoder__workbuf_len(const wuffs_lzw__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_lzw__decoder__decode_io_writer(wuffs_lzw__decoder* self,
+                                     wuffs_base__io_buffer* a_dst,
+                                     wuffs_base__io_buffer* a_src,
+                                     wuffs_base__slice_u8 a_workbuf);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__slice_u8  //
+wuffs_lzw__decoder__flush(wuffs_lzw__decoder* self);
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_lzw__decoder__struct {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+
+    uint32_t f_set_literal_width_arg;
+    uint32_t f_literal_width;
+    uint32_t f_clear_code;
+    uint32_t f_end_code;
+    uint32_t f_save_code;
+    uint32_t f_prev_code;
+    uint32_t f_width;
+    uint32_t f_bits;
+    uint32_t f_n_bits;
+    uint32_t f_output_ri;
+    uint32_t f_output_wi;
+    uint32_t f_read_from_return_value;
+    uint16_t f_prefixes[4096];
+
+    uint32_t p_decode_io_writer[1];
+    uint32_t p_write_to[1];
+  } private_impl;
+
+  struct {
+    uint8_t f_suffixes[4096][8];
+    uint16_t f_lm1s[4096];
+    uint8_t f_output[8199];
+
+  } private_data;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+  initialize(size_t sizeof_star_self,
+             uint64_t wuffs_version,
+             uint32_t initialize_flags) {
+    return wuffs_lzw__decoder__initialize(this, sizeof_star_self, wuffs_version,
+                                          initialize_flags);
+  }
+
+  inline wuffs_base__empty_struct  //
+  set_literal_width(uint32_t a_lw) {
+    return wuffs_lzw__decoder__set_literal_width(this, a_lw);
+  }
+
+  inline wuffs_base__range_ii_u64  //
+  workbuf_len() const {
+    return wuffs_lzw__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status  //
+  decode_io_writer(wuffs_base__io_buffer* a_dst,
+                   wuffs_base__io_buffer* a_src,
+                   wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_lzw__decoder__decode_io_writer(this, a_dst, a_src, a_workbuf);
+  }
+
+  inline wuffs_base__slice_u8  //
+  flush() {
+    return wuffs_lzw__decoder__flush(this);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_lzw__decoder__struct(const wuffs_lzw__decoder__struct&) = delete;
+  wuffs_lzw__decoder__struct& operator=(const wuffs_lzw__decoder__struct&) =
+      delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#endif  // __cplusplus
+
+};  // struct wuffs_lzw__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Status Codes
+
+extern const char* wuffs_gif__error__bad_block;
+extern const char* wuffs_gif__error__bad_extension_label;
+extern const char* wuffs_gif__error__bad_frame_size;
+extern const char* wuffs_gif__error__bad_graphic_control;
+extern const char* wuffs_gif__error__bad_header;
+extern const char* wuffs_gif__error__bad_literal_width;
+extern const char* wuffs_gif__error__bad_palette;
+
+// ---------------- Public Consts
+
+#define WUFFS_GIF__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1
+
+#define WUFFS_GIF__QUIRK_DELAY_NUM_DECODED_FRAMES 1041635328
+
+#define WUFFS_GIF__QUIRK_FIRST_FRAME_LOCAL_PALETTE_MEANS_BLACK_BACKGROUND \
+  1041635329
+
+#define WUFFS_GIF__QUIRK_HONOR_BACKGROUND_COLOR 1041635330
+
+#define WUFFS_GIF__QUIRK_IGNORE_TOO_MUCH_PIXEL_DATA 1041635331
+
+#define WUFFS_GIF__QUIRK_IMAGE_BOUNDS_ARE_STRICT 1041635332
+
+#define WUFFS_GIF__QUIRK_REJECT_EMPTY_FRAME 1041635333
+
+#define WUFFS_GIF__QUIRK_REJECT_EMPTY_PALETTE 1041635334
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_gif__decoder__struct wuffs_gif__decoder;
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_gif__decoder__initialize(wuffs_gif__decoder* self,
+                               size_t sizeof_star_self,
+                               uint64_t wuffs_version,
+                               uint32_t initialize_flags);
+
+size_t  //
+sizeof__wuffs_gif__decoder();
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_gif__decoder__set_quirk_enabled(wuffs_gif__decoder* self,
+                                      uint32_t a_quirk,
+                                      bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__decode_image_config(wuffs_gif__decoder* self,
+                                        wuffs_base__image_config* a_dst,
+                                        wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_gif__decoder__set_report_metadata(wuffs_gif__decoder* self,
+                                        uint32_t a_fourcc,
+                                        bool a_report);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__ack_metadata_chunk(wuffs_gif__decoder* self,
+                                       wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_gif__decoder__metadata_fourcc(const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_gif__decoder__metadata_chunk_length(const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_gif__decoder__num_animation_loops(const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_gif__decoder__num_decoded_frame_configs(const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_gif__decoder__num_decoded_frames(const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32  //
+wuffs_gif__decoder__frame_dirty_rect(const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
+wuffs_gif__decoder__workbuf_len(const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__restart_frame(wuffs_gif__decoder* self,
+                                  uint64_t a_index,
+                                  uint64_t a_io_position);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__decode_frame_config(wuffs_gif__decoder* self,
+                                        wuffs_base__frame_config* a_dst,
+                                        wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__decode_frame(wuffs_gif__decoder* self,
+                                 wuffs_base__pixel_buffer* a_dst,
+                                 wuffs_base__io_buffer* a_src,
+                                 wuffs_base__slice_u8 a_workbuf,
+                                 wuffs_base__decode_frame_options* a_opts);
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_gif__decoder__struct {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+
+    uint32_t f_width;
+    uint32_t f_height;
+    uint8_t f_call_sequence;
+    bool f_ignore_metadata;
+    bool f_report_metadata_iccp;
+    bool f_report_metadata_xmp;
+    uint32_t f_metadata_fourcc_value;
+    uint64_t f_metadata_chunk_length_value;
+    uint64_t f_metadata_io_position;
+    bool f_quirk_enabled_delay_num_decoded_frames;
+    bool f_quirk_enabled_first_frame_local_palette_means_black_background;
+    bool f_quirk_enabled_honor_background_color;
+    bool f_quirk_enabled_ignore_too_much_pixel_data;
+    bool f_quirk_enabled_image_bounds_are_strict;
+    bool f_quirk_enabled_reject_empty_frame;
+    bool f_quirk_enabled_reject_empty_palette;
+    bool f_delayed_num_decoded_frames;
+    bool f_end_of_data;
+    bool f_restarted;
+    bool f_previous_lzw_decode_ended_abruptly;
+    bool f_has_global_palette;
+    uint8_t f_interlace;
+    bool f_seen_num_loops;
+    uint32_t f_num_loops;
+    uint32_t f_background_color_u32_argb_premul;
+    uint32_t f_black_color_u32_argb_premul;
+    bool f_gc_has_transparent_index;
+    uint8_t f_gc_transparent_index;
+    uint8_t f_gc_disposal;
+    uint64_t f_gc_duration;
+    uint64_t f_frame_config_io_position;
+    uint64_t f_num_decoded_frame_configs_value;
+    uint64_t f_num_decoded_frames_value;
+    uint32_t f_frame_rect_x0;
+    uint32_t f_frame_rect_y0;
+    uint32_t f_frame_rect_x1;
+    uint32_t f_frame_rect_y1;
+    uint32_t f_dst_x;
+    uint32_t f_dst_y;
+    uint32_t f_dirty_max_excl_y;
+    uint64_t f_compressed_ri;
+    uint64_t f_compressed_wi;
+    wuffs_base__pixel_swizzler f_swizzler;
+
+    uint32_t p_decode_image_config[1];
+    uint32_t p_ack_metadata_chunk[1];
+    uint32_t p_decode_frame_config[1];
+    uint32_t p_skip_frame[1];
+    uint32_t p_decode_frame[1];
+    uint32_t p_decode_up_to_id_part1[1];
+    uint32_t p_decode_header[1];
+    uint32_t p_decode_lsd[1];
+    uint32_t p_decode_extension[1];
+    uint32_t p_skip_blocks[1];
+    uint32_t p_decode_ae[1];
+    uint32_t p_decode_gc[1];
+    uint32_t p_decode_id_part0[1];
+    uint32_t p_decode_id_part1[1];
+    uint32_t p_decode_id_part2[1];
+  } private_impl;
+
+  struct {
+    uint8_t f_compressed[4096];
+    uint8_t f_palettes[2][1024];
+    uint8_t f_dst_palette[1024];
+    wuffs_lzw__decoder f_lzw;
+
+    struct {
+      uint8_t v_blend;
+      uint32_t v_background_color;
+    } s_decode_frame_config[1];
+    struct {
+      uint64_t scratch;
+    } s_skip_frame[1];
+    struct {
+      uint8_t v_c[6];
+      uint32_t v_i;
+    } s_decode_header[1];
+    struct {
+      uint8_t v_flags;
+      uint8_t v_background_color_index;
+      uint32_t v_num_palette_entries;
+      uint32_t v_i;
+      uint64_t scratch;
+    } s_decode_lsd[1];
+    struct {
+      uint64_t scratch;
+    } s_skip_blocks[1];
+    struct {
+      uint8_t v_block_size;
+      bool v_is_animexts;
+      bool v_is_netscape;
+      bool v_is_iccp;
+      bool v_is_xmp;
+      uint64_t scratch;
+    } s_decode_ae[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_gc[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_id_part0[1];
+    struct {
+      uint8_t v_which_palette;
+      uint32_t v_num_palette_entries;
+      uint32_t v_i;
+      uint64_t scratch;
+    } s_decode_id_part1[1];
+    struct {
+      uint64_t v_block_size;
+      bool v_need_block_size;
+      wuffs_base__status v_lzw_status;
+      uint64_t scratch;
+    } s_decode_id_part2[1];
+  } private_data;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+  initialize(size_t sizeof_star_self,
+             uint64_t wuffs_version,
+             uint32_t initialize_flags) {
+    return wuffs_gif__decoder__initialize(this, sizeof_star_self, wuffs_version,
+                                          initialize_flags);
+  }
+
+  inline wuffs_base__empty_struct  //
+  set_quirk_enabled(uint32_t a_quirk, bool a_enabled) {
+    return wuffs_gif__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__status  //
+  decode_image_config(wuffs_base__image_config* a_dst,
+                      wuffs_base__io_buffer* a_src) {
+    return wuffs_gif__decoder__decode_image_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__empty_struct  //
+  set_report_metadata(uint32_t a_fourcc, bool a_report) {
+    return wuffs_gif__decoder__set_report_metadata(this, a_fourcc, a_report);
+  }
+
+  inline wuffs_base__status  //
+  ack_metadata_chunk(wuffs_base__io_buffer* a_src) {
+    return wuffs_gif__decoder__ack_metadata_chunk(this, a_src);
+  }
+
+  inline uint32_t  //
+  metadata_fourcc() const {
+    return wuffs_gif__decoder__metadata_fourcc(this);
+  }
+
+  inline uint64_t  //
+  metadata_chunk_length() const {
+    return wuffs_gif__decoder__metadata_chunk_length(this);
+  }
+
+  inline uint32_t  //
+  num_animation_loops() const {
+    return wuffs_gif__decoder__num_animation_loops(this);
+  }
+
+  inline uint64_t  //
+  num_decoded_frame_configs() const {
+    return wuffs_gif__decoder__num_decoded_frame_configs(this);
+  }
+
+  inline uint64_t  //
+  num_decoded_frames() const {
+    return wuffs_gif__decoder__num_decoded_frames(this);
+  }
+
+  inline wuffs_base__rect_ie_u32  //
+  frame_dirty_rect() const {
+    return wuffs_gif__decoder__frame_dirty_rect(this);
+  }
+
+  inline wuffs_base__range_ii_u64  //
+  workbuf_len() const {
+    return wuffs_gif__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status  //
+  restart_frame(uint64_t a_index, uint64_t a_io_position) {
+    return wuffs_gif__decoder__restart_frame(this, a_index, a_io_position);
+  }
+
+  inline wuffs_base__status  //
+  decode_frame_config(wuffs_base__frame_config* a_dst,
+                      wuffs_base__io_buffer* a_src) {
+    return wuffs_gif__decoder__decode_frame_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status  //
+  decode_frame(wuffs_base__pixel_buffer* a_dst,
+               wuffs_base__io_buffer* a_src,
+               wuffs_base__slice_u8 a_workbuf,
+               wuffs_base__decode_frame_options* a_opts) {
+    return wuffs_gif__decoder__decode_frame(this, a_dst, a_src, a_workbuf,
+                                            a_opts);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_gif__decoder__struct(const wuffs_gif__decoder__struct&) = delete;
+  wuffs_gif__decoder__struct& operator=(const wuffs_gif__decoder__struct&) =
+      delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#endif  // __cplusplus
+
+};  // struct wuffs_gif__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Status Codes
+
+extern const char* wuffs_gzip__error__bad_checksum;
+extern const char* wuffs_gzip__error__bad_compression_method;
+extern const char* wuffs_gzip__error__bad_encoding_flags;
+extern const char* wuffs_gzip__error__bad_header;
+
+// ---------------- Public Consts
+
+#define WUFFS_GZIP__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_gzip__decoder__struct wuffs_gzip__decoder;
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_gzip__decoder__initialize(wuffs_gzip__decoder* self,
+                                size_t sizeof_star_self,
+                                uint64_t wuffs_version,
+                                uint32_t initialize_flags);
+
+size_t  //
+sizeof__wuffs_gzip__decoder();
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_gzip__decoder__set_ignore_checksum(wuffs_gzip__decoder* self, bool a_ic);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
+wuffs_gzip__decoder__workbuf_len(const wuffs_gzip__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gzip__decoder__decode_io_writer(wuffs_gzip__decoder* self,
+                                      wuffs_base__io_buffer* a_dst,
+                                      wuffs_base__io_buffer* a_src,
+                                      wuffs_base__slice_u8 a_workbuf);
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_gzip__decoder__struct {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+
+    bool f_ignore_checksum;
+
+    uint32_t p_decode_io_writer[1];
+  } private_impl;
+
+  struct {
+    wuffs_crc32__ieee_hasher f_checksum;
+    wuffs_deflate__decoder f_flate;
+
+    struct {
+      uint8_t v_flags;
+      uint32_t v_checksum_got;
+      uint32_t v_decoded_length_got;
+      uint32_t v_checksum_want;
+      uint64_t scratch;
+    } s_decode_io_writer[1];
+  } private_data;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+  initialize(size_t sizeof_star_self,
+             uint64_t wuffs_version,
+             uint32_t initialize_flags) {
+    return wuffs_gzip__decoder__initialize(this, sizeof_star_self,
+                                           wuffs_version, initialize_flags);
+  }
+
+  inline wuffs_base__empty_struct  //
+  set_ignore_checksum(bool a_ic) {
+    return wuffs_gzip__decoder__set_ignore_checksum(this, a_ic);
+  }
+
+  inline wuffs_base__range_ii_u64  //
+  workbuf_len() const {
+    return wuffs_gzip__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status  //
+  decode_io_writer(wuffs_base__io_buffer* a_dst,
+                   wuffs_base__io_buffer* a_src,
+                   wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_gzip__decoder__decode_io_writer(this, a_dst, a_src, a_workbuf);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_gzip__decoder__struct(const wuffs_gzip__decoder__struct&) = delete;
+  wuffs_gzip__decoder__struct& operator=(const wuffs_gzip__decoder__struct&) =
+      delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#endif  // __cplusplus
+
+};  // struct wuffs_gzip__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Status Codes
+
+extern const char* wuffs_zlib__warning__dictionary_required;
+extern const char* wuffs_zlib__error__bad_checksum;
+extern const char* wuffs_zlib__error__bad_compression_method;
+extern const char* wuffs_zlib__error__bad_compression_window_size;
+extern const char* wuffs_zlib__error__bad_parity_check;
+extern const char* wuffs_zlib__error__incorrect_dictionary;
+
+// ---------------- Public Consts
+
+#define WUFFS_ZLIB__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_zlib__decoder__struct wuffs_zlib__decoder;
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for initialize_flags.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_zlib__decoder__initialize(wuffs_zlib__decoder* self,
+                                size_t sizeof_star_self,
+                                uint64_t wuffs_version,
+                                uint32_t initialize_flags);
+
+size_t  //
+sizeof__wuffs_zlib__decoder();
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_zlib__decoder__dictionary_id(const wuffs_zlib__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_zlib__decoder__add_dictionary(wuffs_zlib__decoder* self,
+                                    wuffs_base__slice_u8 a_dict);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_zlib__decoder__set_ignore_checksum(wuffs_zlib__decoder* self, bool a_ic);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
+wuffs_zlib__decoder__workbuf_len(const wuffs_zlib__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_zlib__decoder__decode_io_writer(wuffs_zlib__decoder* self,
+                                      wuffs_base__io_buffer* a_dst,
+                                      wuffs_base__io_buffer* a_src,
+                                      wuffs_base__slice_u8 a_workbuf);
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_zlib__decoder__struct {
+#ifdef WUFFS_IMPLEMENTATION
+
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+
+    bool f_bad_call_sequence;
+    bool f_header_complete;
+    bool f_got_dictionary;
+    bool f_want_dictionary;
+    bool f_ignore_checksum;
+    uint32_t f_dict_id_got;
+    uint32_t f_dict_id_want;
+
+    uint32_t p_decode_io_writer[1];
+  } private_impl;
+
+  struct {
+    wuffs_adler32__hasher f_checksum;
+    wuffs_adler32__hasher f_dict_id_hasher;
+    wuffs_deflate__decoder f_flate;
+
+    struct {
+      uint32_t v_checksum_got;
+      uint64_t scratch;
+    } s_decode_io_writer[1];
+  } private_data;
+
+#else  // WUFFS_IMPLEMENTATION
+
+  // When WUFFS_IMPLEMENTATION is not defined, this placeholder private_impl is
+  // large enough to discourage trying to allocate one on the stack. The sizeof
+  // the real private_impl (and the sizeof the real outermost wuffs_foo__bar
+  // struct) is not part of the public, stable, memory-safe API. Call
+  // wuffs_foo__bar__baz methods (which all take a "this"-like pointer as their
+  // first argument) instead of fiddling with bar.private_impl.qux fields.
+  //
+  // Even when WUFFS_IMPLEMENTATION is not defined, the outermost struct still
+  // defines C++ convenience methods. These methods forward on "this", so that
+  // you can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+ private:
+  union {
+    uint32_t align_as_per_magic_field;
+    uint8_t placeholder[1073741824];  // 1 GiB.
+  } private_impl WUFFS_BASE__POTENTIALLY_UNUSED_FIELD;
+
+ public:
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+  initialize(size_t sizeof_star_self,
+             uint64_t wuffs_version,
+             uint32_t initialize_flags) {
+    return wuffs_zlib__decoder__initialize(this, sizeof_star_self,
+                                           wuffs_version, initialize_flags);
+  }
+
+  inline uint32_t  //
+  dictionary_id() const {
+    return wuffs_zlib__decoder__dictionary_id(this);
+  }
+
+  inline wuffs_base__empty_struct  //
+  add_dictionary(wuffs_base__slice_u8 a_dict) {
+    return wuffs_zlib__decoder__add_dictionary(this, a_dict);
+  }
+
+  inline wuffs_base__empty_struct  //
+  set_ignore_checksum(bool a_ic) {
+    return wuffs_zlib__decoder__set_ignore_checksum(this, a_ic);
+  }
+
+  inline wuffs_base__range_ii_u64  //
+  workbuf_len() const {
+    return wuffs_zlib__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status  //
+  decode_io_writer(wuffs_base__io_buffer* a_dst,
+                   wuffs_base__io_buffer* a_src,
+                   wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_zlib__decoder__decode_io_writer(this, a_dst, a_src, a_workbuf);
+  }
+
+#if (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow copy and assign.
+  wuffs_zlib__decoder__struct(const wuffs_zlib__decoder__struct&) = delete;
+  wuffs_zlib__decoder__struct& operator=(const wuffs_zlib__decoder__struct&) =
+      delete;
+#endif  // (__cplusplus >= 201103L) && !defined(WUFFS_IMPLEMENTATION)
+
+#endif  // __cplusplus
+
+};  // struct wuffs_zlib__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// WUFFS C HEADER ENDS HERE.
+#ifdef WUFFS_IMPLEMENTATION
+
+// GCC does not warn for unused *static inline* functions, but clang does.
+#ifdef __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline wuffs_base__empty_struct  //
+wuffs_base__ignore_status(wuffs_base__status z) {
+  return wuffs_base__make_empty_struct();
+}
+
+// WUFFS_BASE__MAGIC is a magic number to check that initializers are called.
+// It's not foolproof, given C doesn't automatically zero memory before use,
+// but it should catch 99.99% of cases.
+//
+// Its (non-zero) value is arbitrary, based on md5sum("wuffs").
+#define WUFFS_BASE__MAGIC ((uint32_t)0x3CCB6C71)
+
+// WUFFS_BASE__DISABLED is a magic number to indicate that a non-recoverable
+// error was previously encountered.
+//
+// Its (non-zero) value is arbitrary, based on md5sum("disabled").
+#define WUFFS_BASE__DISABLED ((uint32_t)0x075AE3D2)
+
+// Denote intentional fallthroughs for -Wimplicit-fallthrough.
+//
+// The order matters here. Clang also defines "__GNUC__".
+#if defined(__clang__) && defined(__cplusplus) && (__cplusplus >= 201103L)
+#define WUFFS_BASE__FALLTHROUGH [[clang::fallthrough]]
+#elif !defined(__clang__) && defined(__GNUC__) && (__GNUC__ >= 7)
+#define WUFFS_BASE__FALLTHROUGH __attribute__((fallthrough))
+#else
+#define WUFFS_BASE__FALLTHROUGH
+#endif
+
+// Use switch cases for coroutine suspension points, similar to the technique
+// in https://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
+//
+// We use trivial macros instead of an explicit assignment and case statement
+// so that clang-format doesn't get confused by the unusual "case"s.
+#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0 case 0:;
+#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT(n) \
+  coro_susp_point = n;                            \
+  WUFFS_BASE__FALLTHROUGH;                        \
+  case n:;
+
+#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(n) \
+  if (!status) {                                                \
+    goto ok;                                                    \
+  } else if (*status != '$') {                                  \
+    goto exit;                                                  \
+  }                                                             \
+  coro_susp_point = n;                                          \
+  goto suspend;                                                 \
+  case n:;
+
+// Clang also defines "__GNUC__".
+#if defined(__GNUC__)
+#define WUFFS_BASE__LIKELY(expr) (__builtin_expect(!!(expr), 1))
+#define WUFFS_BASE__UNLIKELY(expr) (__builtin_expect(!!(expr), 0))
+#else
+#define WUFFS_BASE__LIKELY(expr) (expr)
+#define WUFFS_BASE__UNLIKELY(expr) (expr)
+#endif
+
+// The helpers below are functions, instead of macros, because their arguments
+// can be an expression that we shouldn't evaluate more than once.
+//
+// They are static, so that linking multiple wuffs .o files won't complain about
+// duplicate function definitions.
+//
+// They are explicitly marked inline, even if modern compilers don't use the
+// inline attribute to guide optimizations such as inlining, to avoid the
+// -Wunused-function warning, and we like to compile with -Wall -Werror.
+
+// ---------------- Numeric Types
+
+static inline uint8_t  //
+wuffs_base__load_u8be(uint8_t* p) {
+  return p[0];
+}
+
+static inline uint16_t  //
+wuffs_base__load_u16be(uint8_t* p) {
+  return (uint16_t)(((uint16_t)(p[0]) << 8) | ((uint16_t)(p[1]) << 0));
+}
+
+static inline uint16_t  //
+wuffs_base__load_u16le(uint8_t* p) {
+  return (uint16_t)(((uint16_t)(p[0]) << 0) | ((uint16_t)(p[1]) << 8));
+}
+
+static inline uint32_t  //
+wuffs_base__load_u24be(uint8_t* p) {
+  return ((uint32_t)(p[0]) << 16) | ((uint32_t)(p[1]) << 8) |
+         ((uint32_t)(p[2]) << 0);
+}
+
+static inline uint32_t  //
+wuffs_base__load_u24le(uint8_t* p) {
+  return ((uint32_t)(p[0]) << 0) | ((uint32_t)(p[1]) << 8) |
+         ((uint32_t)(p[2]) << 16);
+}
+
+static inline uint32_t  //
+wuffs_base__load_u32be(uint8_t* p) {
+  return ((uint32_t)(p[0]) << 24) | ((uint32_t)(p[1]) << 16) |
+         ((uint32_t)(p[2]) << 8) | ((uint32_t)(p[3]) << 0);
+}
+
+static inline uint32_t  //
+wuffs_base__load_u32le(uint8_t* p) {
+  return ((uint32_t)(p[0]) << 0) | ((uint32_t)(p[1]) << 8) |
+         ((uint32_t)(p[2]) << 16) | ((uint32_t)(p[3]) << 24);
+}
+
+static inline uint64_t  //
+wuffs_base__load_u40be(uint8_t* p) {
+  return ((uint64_t)(p[0]) << 32) | ((uint64_t)(p[1]) << 24) |
+         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 8) |
+         ((uint64_t)(p[4]) << 0);
+}
+
+static inline uint64_t  //
+wuffs_base__load_u40le(uint8_t* p) {
+  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
+         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
+         ((uint64_t)(p[4]) << 32);
+}
+
+static inline uint64_t  //
+wuffs_base__load_u48be(uint8_t* p) {
+  return ((uint64_t)(p[0]) << 40) | ((uint64_t)(p[1]) << 32) |
+         ((uint64_t)(p[2]) << 24) | ((uint64_t)(p[3]) << 16) |
+         ((uint64_t)(p[4]) << 8) | ((uint64_t)(p[5]) << 0);
+}
+
+static inline uint64_t  //
+wuffs_base__load_u48le(uint8_t* p) {
+  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
+         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
+         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40);
+}
+
+static inline uint64_t  //
+wuffs_base__load_u56be(uint8_t* p) {
+  return ((uint64_t)(p[0]) << 48) | ((uint64_t)(p[1]) << 40) |
+         ((uint64_t)(p[2]) << 32) | ((uint64_t)(p[3]) << 24) |
+         ((uint64_t)(p[4]) << 16) | ((uint64_t)(p[5]) << 8) |
+         ((uint64_t)(p[6]) << 0);
+}
+
+static inline uint64_t  //
+wuffs_base__load_u56le(uint8_t* p) {
+  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
+         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
+         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40) |
+         ((uint64_t)(p[6]) << 48);
+}
+
+static inline uint64_t  //
+wuffs_base__load_u64be(uint8_t* p) {
+  return ((uint64_t)(p[0]) << 56) | ((uint64_t)(p[1]) << 48) |
+         ((uint64_t)(p[2]) << 40) | ((uint64_t)(p[3]) << 32) |
+         ((uint64_t)(p[4]) << 24) | ((uint64_t)(p[5]) << 16) |
+         ((uint64_t)(p[6]) << 8) | ((uint64_t)(p[7]) << 0);
+}
+
+static inline uint64_t  //
+wuffs_base__load_u64le(uint8_t* p) {
+  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
+         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
+         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40) |
+         ((uint64_t)(p[6]) << 48) | ((uint64_t)(p[7]) << 56);
+}
+
+// --------
+
+static inline void  //
+wuffs_base__store_u8be(uint8_t* p, uint8_t x) {
+  p[0] = x;
+}
+
+static inline void  //
+wuffs_base__store_u16be(uint8_t* p, uint16_t x) {
+  p[0] = (uint8_t)(x >> 8);
+  p[1] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__store_u16le(uint8_t* p, uint16_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+}
+
+static inline void  //
+wuffs_base__store_u24be(uint8_t* p, uint32_t x) {
+  p[0] = (uint8_t)(x >> 16);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__store_u24le(uint8_t* p, uint32_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+}
+
+static inline void  //
+wuffs_base__store_u32be(uint8_t* p, uint32_t x) {
+  p[0] = (uint8_t)(x >> 24);
+  p[1] = (uint8_t)(x >> 16);
+  p[2] = (uint8_t)(x >> 8);
+  p[3] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__store_u32le(uint8_t* p, uint32_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 24);
+}
+
+static inline void  //
+wuffs_base__store_u40be(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 32);
+  p[1] = (uint8_t)(x >> 24);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 8);
+  p[4] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__store_u40le(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 24);
+  p[4] = (uint8_t)(x >> 32);
+}
+
+static inline void  //
+wuffs_base__store_u48be(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 40);
+  p[1] = (uint8_t)(x >> 32);
+  p[2] = (uint8_t)(x >> 24);
+  p[3] = (uint8_t)(x >> 16);
+  p[4] = (uint8_t)(x >> 8);
+  p[5] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__store_u48le(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 24);
+  p[4] = (uint8_t)(x >> 32);
+  p[5] = (uint8_t)(x >> 40);
+}
+
+static inline void  //
+wuffs_base__store_u56be(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 48);
+  p[1] = (uint8_t)(x >> 40);
+  p[2] = (uint8_t)(x >> 32);
+  p[3] = (uint8_t)(x >> 24);
+  p[4] = (uint8_t)(x >> 16);
+  p[5] = (uint8_t)(x >> 8);
+  p[6] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__store_u56le(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 24);
+  p[4] = (uint8_t)(x >> 32);
+  p[5] = (uint8_t)(x >> 40);
+  p[6] = (uint8_t)(x >> 48);
+}
+
+static inline void  //
+wuffs_base__store_u64be(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 56);
+  p[1] = (uint8_t)(x >> 48);
+  p[2] = (uint8_t)(x >> 40);
+  p[3] = (uint8_t)(x >> 32);
+  p[4] = (uint8_t)(x >> 24);
+  p[5] = (uint8_t)(x >> 16);
+  p[6] = (uint8_t)(x >> 8);
+  p[7] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__store_u64le(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 24);
+  p[4] = (uint8_t)(x >> 32);
+  p[5] = (uint8_t)(x >> 40);
+  p[6] = (uint8_t)(x >> 48);
+  p[7] = (uint8_t)(x >> 56);
+}
+
+// --------
+
+extern const uint8_t wuffs_base__low_bits_mask__u8[9];
+extern const uint16_t wuffs_base__low_bits_mask__u16[17];
+extern const uint32_t wuffs_base__low_bits_mask__u32[33];
+extern const uint64_t wuffs_base__low_bits_mask__u64[65];
+
+#define WUFFS_BASE__LOW_BITS_MASK__U8(n) (wuffs_base__low_bits_mask__u8[n])
+#define WUFFS_BASE__LOW_BITS_MASK__U16(n) (wuffs_base__low_bits_mask__u16[n])
+#define WUFFS_BASE__LOW_BITS_MASK__U32(n) (wuffs_base__low_bits_mask__u32[n])
+#define WUFFS_BASE__LOW_BITS_MASK__U64(n) (wuffs_base__low_bits_mask__u64[n])
+
+// --------
+
+static inline void  //
+wuffs_base__u8__sat_add_indirect(uint8_t* x, uint8_t y) {
+  *x = wuffs_base__u8__sat_add(*x, y);
+}
+
+static inline void  //
+wuffs_base__u8__sat_sub_indirect(uint8_t* x, uint8_t y) {
+  *x = wuffs_base__u8__sat_sub(*x, y);
+}
+
+static inline void  //
+wuffs_base__u16__sat_add_indirect(uint16_t* x, uint16_t y) {
+  *x = wuffs_base__u16__sat_add(*x, y);
+}
+
+static inline void  //
+wuffs_base__u16__sat_sub_indirect(uint16_t* x, uint16_t y) {
+  *x = wuffs_base__u16__sat_sub(*x, y);
+}
+
+static inline void  //
+wuffs_base__u32__sat_add_indirect(uint32_t* x, uint32_t y) {
+  *x = wuffs_base__u32__sat_add(*x, y);
+}
+
+static inline void  //
+wuffs_base__u32__sat_sub_indirect(uint32_t* x, uint32_t y) {
+  *x = wuffs_base__u32__sat_sub(*x, y);
+}
+
+static inline void  //
+wuffs_base__u64__sat_add_indirect(uint64_t* x, uint64_t y) {
+  *x = wuffs_base__u64__sat_add(*x, y);
+}
+
+static inline void  //
+wuffs_base__u64__sat_sub_indirect(uint64_t* x, uint64_t y) {
+  *x = wuffs_base__u64__sat_sub(*x, y);
+}
+
+// ---------------- Slices and Tables
+
+// wuffs_base__slice_u8__prefix returns up to the first up_to bytes of s.
+static inline wuffs_base__slice_u8  //
+wuffs_base__slice_u8__prefix(wuffs_base__slice_u8 s, uint64_t up_to) {
+  if ((uint64_t)(s.len) > up_to) {
+    s.len = up_to;
+  }
+  return s;
+}
+
+// wuffs_base__slice_u8__suffix returns up to the last up_to bytes of s.
+static inline wuffs_base__slice_u8  //
+wuffs_base__slice_u8__suffix(wuffs_base__slice_u8 s, uint64_t up_to) {
+  if ((uint64_t)(s.len) > up_to) {
+    s.ptr += (uint64_t)(s.len) - up_to;
+    s.len = up_to;
+  }
+  return s;
+}
+
+// wuffs_base__slice_u8__copy_from_slice calls memmove(dst.ptr, src.ptr, len)
+// where len is the minimum of dst.len and src.len.
+//
+// Passing a wuffs_base__slice_u8 with all fields NULL or zero (a valid, empty
+// slice) is valid and results in a no-op.
+static inline uint64_t  //
+wuffs_base__slice_u8__copy_from_slice(wuffs_base__slice_u8 dst,
+                                      wuffs_base__slice_u8 src) {
+  size_t len = dst.len < src.len ? dst.len : src.len;
+  if (len > 0) {
+    memmove(dst.ptr, src.ptr, len);
+  }
+  return len;
+}
+
+// --------
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__table_u8__row(wuffs_base__table_u8 t, uint32_t y) {
+  if (y < t.height) {
+    return wuffs_base__make_slice_u8(t.ptr + (t.stride * y), t.width);
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+  // ---------------- Slices and Tables (Utility)
+
+#define wuffs_base__utility__empty_slice_u8 wuffs_base__empty_slice_u8
+
+// ---------------- Ranges and Rects
+
+static inline uint32_t  //
+wuffs_base__range_ii_u32__get_min_incl(const wuffs_base__range_ii_u32* r) {
+  return r->min_incl;
+}
+
+static inline uint32_t  //
+wuffs_base__range_ii_u32__get_max_incl(const wuffs_base__range_ii_u32* r) {
+  return r->max_incl;
+}
+
+static inline uint32_t  //
+wuffs_base__range_ie_u32__get_min_incl(const wuffs_base__range_ie_u32* r) {
+  return r->min_incl;
+}
+
+static inline uint32_t  //
+wuffs_base__range_ie_u32__get_max_excl(const wuffs_base__range_ie_u32* r) {
+  return r->max_excl;
+}
+
+static inline uint64_t  //
+wuffs_base__range_ii_u64__get_min_incl(const wuffs_base__range_ii_u64* r) {
+  return r->min_incl;
+}
+
+static inline uint64_t  //
+wuffs_base__range_ii_u64__get_max_incl(const wuffs_base__range_ii_u64* r) {
+  return r->max_incl;
+}
+
+static inline uint64_t  //
+wuffs_base__range_ie_u64__get_min_incl(const wuffs_base__range_ie_u64* r) {
+  return r->min_incl;
+}
+
+static inline uint64_t  //
+wuffs_base__range_ie_u64__get_max_excl(const wuffs_base__range_ie_u64* r) {
+  return r->max_excl;
+}
+
+  // ---------------- Ranges and Rects (Utility)
+
+#define wuffs_base__utility__make_range_ii_u32 wuffs_base__make_range_ii_u32
+#define wuffs_base__utility__make_range_ie_u32 wuffs_base__make_range_ie_u32
+#define wuffs_base__utility__make_range_ii_u64 wuffs_base__make_range_ii_u64
+#define wuffs_base__utility__make_range_ie_u64 wuffs_base__make_range_ie_u64
+#define wuffs_base__utility__make_rect_ii_u32 wuffs_base__make_rect_ii_u32
+#define wuffs_base__utility__make_rect_ie_u32 wuffs_base__make_rect_ie_u32
+
+// ---------------- I/O
+
+static inline uint64_t  //
+wuffs_base__io__count_since(uint64_t mark, uint64_t index) {
+  if (index >= mark) {
+    return index - mark;
+  }
+  return 0;
+}
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__io__since(uint64_t mark, uint64_t index, uint8_t* ptr) {
+  if (index >= mark) {
+    return wuffs_base__make_slice_u8(ptr + mark, index - mark);
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+static inline uint32_t  //
+wuffs_base__io_writer__copy_n_from_history(uint8_t** ptr_iop_w,
+                                           uint8_t* io1_w,
+                                           uint8_t* io2_w,
+                                           uint32_t length,
+                                           uint32_t distance) {
+  if (!distance) {
+    return 0;
+  }
+  uint8_t* p = *ptr_iop_w;
+  if ((size_t)(p - io1_w) < (size_t)(distance)) {
+    return 0;
+  }
+  uint8_t* q = p - distance;
+  size_t n = (size_t)(io2_w - p);
+  if ((size_t)(length) > n) {
+    length = (uint32_t)(n);
+  } else {
+    n = (size_t)(length);
+  }
+  // TODO: unrolling by 3 seems best for the std/deflate benchmarks, but that
+  // is mostly because 3 is the minimum length for the deflate format. This
+  // function implementation shouldn't overfit to that one format. Perhaps the
+  // copy_n_from_history Wuffs method should also take an unroll hint argument,
+  // and the cgen can look if that argument is the constant expression '3'.
+  //
+  // See also wuffs_base__io_writer__copy_n_from_history_fast below.
+  //
+  // Alternatively, or additionally, have a sloppy_copy_n_from_history method
+  // that copies 8 bytes at a time, possibly writing more than length bytes?
+  for (; n >= 3; n -= 3) {
+    *p++ = *q++;
+    *p++ = *q++;
+    *p++ = *q++;
+  }
+  for (; n; n--) {
+    *p++ = *q++;
+  }
+  *ptr_iop_w = p;
+  return length;
+}
+
+// wuffs_base__io_writer__copy_n_from_history_fast is like the
+// wuffs_base__io_writer__copy_n_from_history function above, but has stronger
+// pre-conditions. The caller needs to prove that:
+//  - distance >  0
+//  - distance <= (*ptr_iop_w - io1_w)
+//  - length   <= (io2_w      - *ptr_iop_w)
+static inline uint32_t  //
+wuffs_base__io_writer__copy_n_from_history_fast(uint8_t** ptr_iop_w,
+                                                uint8_t* io1_w,
+                                                uint8_t* io2_w,
+                                                uint32_t length,
+                                                uint32_t distance) {
+  uint8_t* p = *ptr_iop_w;
+  uint8_t* q = p - distance;
+  uint32_t n = length;
+  for (; n >= 3; n -= 3) {
+    *p++ = *q++;
+    *p++ = *q++;
+    *p++ = *q++;
+  }
+  for (; n; n--) {
+    *p++ = *q++;
+  }
+  *ptr_iop_w = p;
+  return length;
+}
+
+static inline uint32_t  //
+wuffs_base__io_writer__copy_n_from_reader(uint8_t** ptr_iop_w,
+                                          uint8_t* io2_w,
+                                          uint32_t length,
+                                          uint8_t** ptr_iop_r,
+                                          uint8_t* io2_r) {
+  uint8_t* iop_w = *ptr_iop_w;
+  size_t n = length;
+  if (n > ((size_t)(io2_w - iop_w))) {
+    n = (size_t)(io2_w - iop_w);
+  }
+  uint8_t* iop_r = *ptr_iop_r;
+  if (n > ((size_t)(io2_r - iop_r))) {
+    n = (size_t)(io2_r - iop_r);
+  }
+  if (n > 0) {
+    memmove(iop_w, iop_r, n);
+    *ptr_iop_w += n;
+    *ptr_iop_r += n;
+  }
+  return (uint32_t)(n);
+}
+
+static inline uint64_t  //
+wuffs_base__io_writer__copy_from_slice(uint8_t** ptr_iop_w,
+                                       uint8_t* io2_w,
+                                       wuffs_base__slice_u8 src) {
+  uint8_t* iop_w = *ptr_iop_w;
+  size_t n = src.len;
+  if (n > ((size_t)(io2_w - iop_w))) {
+    n = (size_t)(io2_w - iop_w);
+  }
+  if (n > 0) {
+    memmove(iop_w, src.ptr, n);
+    *ptr_iop_w += n;
+  }
+  return (uint64_t)(n);
+}
+
+static inline uint32_t  //
+wuffs_base__io_writer__copy_n_from_slice(uint8_t** ptr_iop_w,
+                                         uint8_t* io2_w,
+                                         uint32_t length,
+                                         wuffs_base__slice_u8 src) {
+  uint8_t* iop_w = *ptr_iop_w;
+  size_t n = src.len;
+  if (n > length) {
+    n = length;
+  }
+  if (n > ((size_t)(io2_w - iop_w))) {
+    n = (size_t)(io2_w - iop_w);
+  }
+  if (n > 0) {
+    memmove(iop_w, src.ptr, n);
+    *ptr_iop_w += n;
+  }
+  return (uint32_t)(n);
+}
+
+static inline wuffs_base__io_buffer*  //
+wuffs_base__io_reader__set(wuffs_base__io_buffer* b,
+                           uint8_t** ptr_iop_r,
+                           uint8_t** ptr_io0_r,
+                           uint8_t** ptr_io1_r,
+                           uint8_t** ptr_io2_r,
+                           wuffs_base__slice_u8 data) {
+  b->data = data;
+  b->meta.wi = data.len;
+  b->meta.ri = 0;
+  b->meta.pos = 0;
+  b->meta.closed = false;
+
+  *ptr_iop_r = data.ptr;
+  *ptr_io0_r = data.ptr;
+  *ptr_io1_r = data.ptr;
+  *ptr_io2_r = data.ptr + data.len;
+
+  return b;
+}
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__io_reader__take(uint8_t** ptr_iop_r, uint8_t* io2_r, uint64_t n) {
+  if (n <= ((size_t)(io2_r - *ptr_iop_r))) {
+    uint8_t* p = *ptr_iop_r;
+    *ptr_iop_r += n;
+    return wuffs_base__make_slice_u8(p, n);
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+static inline wuffs_base__io_buffer*  //
+wuffs_base__io_writer__set(wuffs_base__io_buffer* b,
+                           uint8_t** ptr_iop_w,
+                           uint8_t** ptr_io0_w,
+                           uint8_t** ptr_io1_w,
+                           uint8_t** ptr_io2_w,
+                           wuffs_base__slice_u8 data) {
+  b->data = data;
+  b->meta.wi = 0;
+  b->meta.ri = 0;
+  b->meta.pos = 0;
+  b->meta.closed = false;
+
+  *ptr_iop_w = data.ptr;
+  *ptr_io0_w = data.ptr;
+  *ptr_io1_w = data.ptr;
+  *ptr_io2_w = data.ptr + data.len;
+
+  return b;
+}
+
+  // ---------------- I/O (Utility)
+
+#define wuffs_base__utility__empty_io_reader wuffs_base__empty_io_reader
+#define wuffs_base__utility__empty_io_writer wuffs_base__empty_io_writer
+
+  // ---------------- Memory Allocation
+
+  // ---------------- Images
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE)
+
+const uint8_t wuffs_base__low_bits_mask__u8[9] = {
+    0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF,
+};
+
+const uint16_t wuffs_base__low_bits_mask__u16[17] = {
+    0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF,
+    0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF,
+};
+
+const uint32_t wuffs_base__low_bits_mask__u32[33] = {
+    0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000F, 0x0000001F,
+    0x0000003F, 0x0000007F, 0x000000FF, 0x000001FF, 0x000003FF, 0x000007FF,
+    0x00000FFF, 0x00001FFF, 0x00003FFF, 0x00007FFF, 0x0000FFFF, 0x0001FFFF,
+    0x0003FFFF, 0x0007FFFF, 0x000FFFFF, 0x001FFFFF, 0x003FFFFF, 0x007FFFFF,
+    0x00FFFFFF, 0x01FFFFFF, 0x03FFFFFF, 0x07FFFFFF, 0x0FFFFFFF, 0x1FFFFFFF,
+    0x3FFFFFFF, 0x7FFFFFFF, 0xFFFFFFFF,
+};
+
+const uint64_t wuffs_base__low_bits_mask__u64[65] = {
+    0x0000000000000000, 0x0000000000000001, 0x0000000000000003,
+    0x0000000000000007, 0x000000000000000F, 0x000000000000001F,
+    0x000000000000003F, 0x000000000000007F, 0x00000000000000FF,
+    0x00000000000001FF, 0x00000000000003FF, 0x00000000000007FF,
+    0x0000000000000FFF, 0x0000000000001FFF, 0x0000000000003FFF,
+    0x0000000000007FFF, 0x000000000000FFFF, 0x000000000001FFFF,
+    0x000000000003FFFF, 0x000000000007FFFF, 0x00000000000FFFFF,
+    0x00000000001FFFFF, 0x00000000003FFFFF, 0x00000000007FFFFF,
+    0x0000000000FFFFFF, 0x0000000001FFFFFF, 0x0000000003FFFFFF,
+    0x0000000007FFFFFF, 0x000000000FFFFFFF, 0x000000001FFFFFFF,
+    0x000000003FFFFFFF, 0x000000007FFFFFFF, 0x00000000FFFFFFFF,
+    0x00000001FFFFFFFF, 0x00000003FFFFFFFF, 0x00000007FFFFFFFF,
+    0x0000000FFFFFFFFF, 0x0000001FFFFFFFFF, 0x0000003FFFFFFFFF,
+    0x0000007FFFFFFFFF, 0x000000FFFFFFFFFF, 0x000001FFFFFFFFFF,
+    0x000003FFFFFFFFFF, 0x000007FFFFFFFFFF, 0x00000FFFFFFFFFFF,
+    0x00001FFFFFFFFFFF, 0x00003FFFFFFFFFFF, 0x00007FFFFFFFFFFF,
+    0x0000FFFFFFFFFFFF, 0x0001FFFFFFFFFFFF, 0x0003FFFFFFFFFFFF,
+    0x0007FFFFFFFFFFFF, 0x000FFFFFFFFFFFFF, 0x001FFFFFFFFFFFFF,
+    0x003FFFFFFFFFFFFF, 0x007FFFFFFFFFFFFF, 0x00FFFFFFFFFFFFFF,
+    0x01FFFFFFFFFFFFFF, 0x03FFFFFFFFFFFFFF, 0x07FFFFFFFFFFFFFF,
+    0x0FFFFFFFFFFFFFFF, 0x1FFFFFFFFFFFFFFF, 0x3FFFFFFFFFFFFFFF,
+    0x7FFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF,
+};
+
+const char* wuffs_base__warning__end_of_data = "@base: end of data";
+const char* wuffs_base__warning__metadata_reported = "@base: metadata reported";
+const char* wuffs_base__suspension__short_read = "$base: short read";
+const char* wuffs_base__suspension__short_write = "$base: short write";
+const char* wuffs_base__error__bad_i_o_position = "#base: bad I/O position";
+const char* wuffs_base__error__bad_argument_length_too_short =
+    "#base: bad argument (length too short)";
+const char* wuffs_base__error__bad_argument = "#base: bad argument";
+const char* wuffs_base__error__bad_call_sequence = "#base: bad call sequence";
+const char* wuffs_base__error__bad_receiver = "#base: bad receiver";
+const char* wuffs_base__error__bad_restart = "#base: bad restart";
+const char* wuffs_base__error__bad_sizeof_receiver =
+    "#base: bad sizeof receiver";
+const char* wuffs_base__error__bad_workbuf_length = "#base: bad workbuf length";
+const char* wuffs_base__error__bad_wuffs_version = "#base: bad wuffs version";
+const char* wuffs_base__error__cannot_return_a_suspension =
+    "#base: cannot return a suspension";
+const char* wuffs_base__error__disabled_by_previous_error =
+    "#base: disabled by previous error";
+const char* wuffs_base__error__initialize_falsely_claimed_already_zeroed =
+    "#base: initialize falsely claimed already zeroed";
+const char* wuffs_base__error__initialize_not_called =
+    "#base: initialize not called";
+const char* wuffs_base__error__interleaved_coroutine_calls =
+    "#base: interleaved coroutine calls";
+const char* wuffs_base__error__not_enough_data = "#base: not enough data";
+const char* wuffs_base__error__unsupported_option = "#base: unsupported option";
+const char* wuffs_base__error__too_much_data = "#base: too much data";
+
+// ---------------- Images
+
+const uint32_t wuffs_base__pixel_format__bits_per_channel[16] = {
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+    0x08, 0x0A, 0x0C, 0x10, 0x18, 0x20, 0x30, 0x40,
+};
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_1_1(wuffs_base__slice_u8 dst,
+                                     wuffs_base__slice_u8 dst_palette,
+                                     wuffs_base__slice_u8 src) {
+  return wuffs_base__slice_u8__copy_from_slice(dst, src);
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_3_1(wuffs_base__slice_u8 dst,
+                                     wuffs_base__slice_u8 dst_palette,
+                                     wuffs_base__slice_u8 src) {
+  if (dst_palette.len != 1024) {
+    return 0;
+  }
+  size_t dst_len3 = dst.len / 3;
+  size_t len = dst_len3 < src.len ? dst_len3 : src.len;
+  uint8_t* d = dst.ptr;
+  uint8_t* s = src.ptr;
+  size_t n = len;
+
+  // N is the loop unroll count.
+  const int N = 4;
+
+  // The comparison in the while condition is ">", not ">=", because with ">=",
+  // the last 4-byte store could write past the end of the dst slice.
+  //
+  // Each 4-byte store writes one too many bytes, but a subsequent store will
+  // overwrite that with the correct byte. There is always another store,
+  // whether a 4-byte store in this loop or a 1-byte store in the next loop.
+  while (n > N) {
+    wuffs_base__store_u32le(
+        d + (0 * 3),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4)));
+    wuffs_base__store_u32le(
+        d + (1 * 3),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[1]) * 4)));
+    wuffs_base__store_u32le(
+        d + (2 * 3),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[2]) * 4)));
+    wuffs_base__store_u32le(
+        d + (3 * 3),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[3]) * 4)));
+
+    s += 1 * N;
+    d += 3 * N;
+    n -= (size_t)(1 * N);
+  }
+
+  while (n >= 1) {
+    uint32_t color =
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4));
+    d[0] = (uint8_t)(color >> 0);
+    d[1] = (uint8_t)(color >> 8);
+    d[2] = (uint8_t)(color >> 16);
+
+    s += 1 * 1;
+    d += 3 * 1;
+    n -= (size_t)(1 * 1);
+  }
+
+  return len;
+}
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_4_1(wuffs_base__slice_u8 dst,
+                                     wuffs_base__slice_u8 dst_palette,
+                                     wuffs_base__slice_u8 src) {
+  if (dst_palette.len != 1024) {
+    return 0;
+  }
+  size_t dst_len4 = dst.len / 4;
+  size_t len = dst_len4 < src.len ? dst_len4 : src.len;
+  uint8_t* d = dst.ptr;
+  uint8_t* s = src.ptr;
+  size_t n = len;
+
+  // N is the loop unroll count.
+  const int N = 4;
+
+  while (n >= N) {
+    wuffs_base__store_u32le(
+        d + (0 * 4),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4)));
+    wuffs_base__store_u32le(
+        d + (1 * 4),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[1]) * 4)));
+    wuffs_base__store_u32le(
+        d + (2 * 4),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[2]) * 4)));
+    wuffs_base__store_u32le(
+        d + (3 * 4),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[3]) * 4)));
+
+    s += 1 * N;
+    d += 4 * N;
+    n -= (size_t)(1 * N);
+  }
+
+  while (n >= 1) {
+    wuffs_base__store_u32le(
+        d + (0 * 4),
+        wuffs_base__load_u32le(dst_palette.ptr + ((uint32_t)(s[0]) * 4)));
+
+    s += 1 * 1;
+    d += 4 * 1;
+    n -= (size_t)(1 * 1);
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__swap_rgbx_bgrx(wuffs_base__slice_u8 dst,
+                                           wuffs_base__slice_u8 src) {
+  size_t len4 = (dst.len < src.len ? dst.len : src.len) / 4;
+  uint8_t* d = dst.ptr;
+  uint8_t* s = src.ptr;
+
+  size_t n = len4;
+  while (n--) {
+    uint8_t b0 = s[0];
+    uint8_t b1 = s[1];
+    uint8_t b2 = s[2];
+    uint8_t b3 = s[3];
+    d[0] = b2;
+    d[1] = b1;
+    d[2] = b0;
+    d[3] = b3;
+    s += 4;
+    d += 4;
+  }
+  return len4 * 4;
+}
+
+wuffs_base__status  //
+wuffs_base__pixel_swizzler__prepare(wuffs_base__pixel_swizzler* p,
+                                    wuffs_base__pixel_format dst_format,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_format,
+                                    wuffs_base__slice_u8 src_palette) {
+  if (!p) {
+    return wuffs_base__error__bad_receiver;
+  }
+
+  // TODO: support many more formats.
+
+  uint64_t (*func)(wuffs_base__slice_u8 dst, wuffs_base__slice_u8 dst_palette,
+                   wuffs_base__slice_u8 src) = NULL;
+
+  switch (src_format) {
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
+      switch (dst_format) {
+        case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
+        case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
+        case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
+          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+              1024) {
+            break;
+          }
+          func = wuffs_base__pixel_swizzler__copy_1_1;
+          break;
+        case WUFFS_BASE__PIXEL_FORMAT__BGR:
+          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+              1024) {
+            break;
+          }
+          func = wuffs_base__pixel_swizzler__copy_3_1;
+          break;
+        case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+        case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+        case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+              1024) {
+            break;
+          }
+          func = wuffs_base__pixel_swizzler__copy_4_1;
+          break;
+        case WUFFS_BASE__PIXEL_FORMAT__RGB:
+          if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(dst_palette,
+                                                         src_palette) != 1024) {
+            break;
+          }
+          func = wuffs_base__pixel_swizzler__copy_3_1;
+          break;
+        case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+        case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+        case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+          if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(dst_palette,
+                                                         src_palette) != 1024) {
+            break;
+          }
+          func = wuffs_base__pixel_swizzler__copy_4_1;
+          break;
+        default:
+          break;
+      }
+      break;
+
+    default:
+      break;
+  }
+
+  p->private_impl.func = func;
+  return func ? NULL : wuffs_base__error__unsupported_option;
+}
+
+uint64_t  //
+wuffs_base__pixel_swizzler__swizzle_interleaved(
+    const wuffs_base__pixel_swizzler* p,
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src) {
+  if (p && p->private_impl.func) {
+    return (*(p->private_impl.func))(dst, dst_palette, src);
+  }
+  return 0;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE)
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ADLER32)
+
+// ---------------- Status Codes Implementations
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_adler32__hasher__initialize(wuffs_adler32__hasher* self,
+                                  size_t sizeof_star_self,
+                                  uint64_t wuffs_version,
+                                  uint32_t initialize_flags) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__error__bad_wuffs_version;
+  }
+
+  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+// The whole point of this if-check is to detect an uninitialized *self.
+// We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((initialize_flags &
+         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_adler32__hasher() {
+  return sizeof(wuffs_adler32__hasher);
+}
+
+// ---------------- Function Implementations
+
+// -------- func adler32.hasher.update_u32
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_adler32__hasher__update_u32(wuffs_adler32__hasher* self,
+                                  wuffs_base__slice_u8 a_x) {
+  if (!self) {
+    return 0;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return 0;
+  }
+
+  uint32_t v_s1 = 0;
+  uint32_t v_s2 = 0;
+  wuffs_base__slice_u8 v_remaining = {0};
+  wuffs_base__slice_u8 v_p = {0};
+
+  if (!self->private_impl.f_started) {
+    self->private_impl.f_started = true;
+    self->private_impl.f_state = 1;
+  }
+  v_s1 = ((self->private_impl.f_state) & 0xFFFF);
+  v_s2 = ((self->private_impl.f_state) >> (32 - (16)));
+  while (((uint64_t)(a_x.len)) > 0) {
+    v_remaining = wuffs_base__slice_u8__subslice_j(a_x, 0);
+    if (((uint64_t)(a_x.len)) > 5552) {
+      v_remaining = wuffs_base__slice_u8__subslice_i(a_x, 5552);
+      a_x = wuffs_base__slice_u8__subslice_j(a_x, 5552);
+    }
+    {
+      wuffs_base__slice_u8 i_slice_p = a_x;
+      v_p = i_slice_p;
+      v_p.len = 1;
+      uint8_t* i_end0_p = i_slice_p.ptr + (i_slice_p.len / 8) * 8;
+      while (v_p.ptr < i_end0_p) {
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+      }
+      v_p.len = 1;
+      uint8_t* i_end1_p = i_slice_p.ptr + (i_slice_p.len / 1) * 1;
+      while (v_p.ptr < i_end1_p) {
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+      }
+    }
+    v_s1 %= 65521;
+    v_s2 %= 65521;
+    a_x = v_remaining;
+  }
+  self->private_impl.f_state = (((v_s2 & 65535) << 16) | (v_s1 & 65535));
+  return self->private_impl.f_state;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__ADLER32)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__CRC32)
+
+// ---------------- Status Codes Implementations
+
+// ---------------- Private Consts
+
+static const uint32_t                 //
+    wuffs_crc32__ieee_table[16][256]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        {
+            0,          1996959894, 3993919788, 2567524794, 124634137,
+            1886057615, 3915621685, 2657392035, 249268274,  2044508324,
+            3772115230, 2547177864, 162941995,  2125561021, 3887607047,
+            2428444049, 498536548,  1789927666, 4089016648, 2227061214,
+            450548861,  1843258603, 4107580753, 2211677639, 325883990,
+            1684777152, 4251122042, 2321926636, 335633487,  1661365465,
+            4195302755, 2366115317, 997073096,  1281953886, 3579855332,
+            2724688242, 1006888145, 1258607687, 3524101629, 2768942443,
+            901097722,  1119000684, 3686517206, 2898065728, 853044451,
+            1172266101, 3705015759, 2882616665, 651767980,  1373503546,
+            3369554304, 3218104598, 565507253,  1454621731, 3485111705,
+            3099436303, 671266974,  1594198024, 3322730930, 2970347812,
+            795835527,  1483230225, 3244367275, 3060149565, 1994146192,
+            31158534,   2563907772, 4023717930, 1907459465, 112637215,
+            2680153253, 3904427059, 2013776290, 251722036,  2517215374,
+            3775830040, 2137656763, 141376813,  2439277719, 3865271297,
+            1802195444, 476864866,  2238001368, 4066508878, 1812370925,
+            453092731,  2181625025, 4111451223, 1706088902, 314042704,
+            2344532202, 4240017532, 1658658271, 366619977,  2362670323,
+            4224994405, 1303535960, 984961486,  2747007092, 3569037538,
+            1256170817, 1037604311, 2765210733, 3554079995, 1131014506,
+            879679996,  2909243462, 3663771856, 1141124467, 855842277,
+            2852801631, 3708648649, 1342533948, 654459306,  3188396048,
+            3373015174, 1466479909, 544179635,  3110523913, 3462522015,
+            1591671054, 702138776,  2966460450, 3352799412, 1504918807,
+            783551873,  3082640443, 3233442989, 3988292384, 2596254646,
+            62317068,   1957810842, 3939845945, 2647816111, 81470997,
+            1943803523, 3814918930, 2489596804, 225274430,  2053790376,
+            3826175755, 2466906013, 167816743,  2097651377, 4027552580,
+            2265490386, 503444072,  1762050814, 4150417245, 2154129355,
+            426522225,  1852507879, 4275313526, 2312317920, 282753626,
+            1742555852, 4189708143, 2394877945, 397917763,  1622183637,
+            3604390888, 2714866558, 953729732,  1340076626, 3518719985,
+            2797360999, 1068828381, 1219638859, 3624741850, 2936675148,
+            906185462,  1090812512, 3747672003, 2825379669, 829329135,
+            1181335161, 3412177804, 3160834842, 628085408,  1382605366,
+            3423369109, 3138078467, 570562233,  1426400815, 3317316542,
+            2998733608, 733239954,  1555261956, 3268935591, 3050360625,
+            752459403,  1541320221, 2607071920, 3965973030, 1969922972,
+            40735498,   2617837225, 3943577151, 1913087877, 83908371,
+            2512341634, 3803740692, 2075208622, 213261112,  2463272603,
+            3855990285, 2094854071, 198958881,  2262029012, 4057260610,
+            1759359992, 534414190,  2176718541, 4139329115, 1873836001,
+            414664567,  2282248934, 4279200368, 1711684554, 285281116,
+            2405801727, 4167216745, 1634467795, 376229701,  2685067896,
+            3608007406, 1308918612, 956543938,  2808555105, 3495958263,
+            1231636301, 1047427035, 2932959818, 3654703836, 1088359270,
+            936918000,  2847714899, 3736837829, 1202900863, 817233897,
+            3183342108, 3401237130, 1404277552, 615818150,  3134207493,
+            3453421203, 1423857449, 601450431,  3009837614, 3294710456,
+            1567103746, 711928724,  3020668471, 3272380065, 1510334235,
+            755167117,
+        },
+        {
+            0,          421212481,  842424962,  724390851,  1684849924,
+            2105013317, 1448781702, 1329698503, 3369699848, 3519200073,
+            4210026634, 3824474571, 2897563404, 3048111693, 2659397006,
+            2274893007, 1254232657, 1406739216, 2029285587, 1643069842,
+            783210325,  934667796,  479770071,  92505238,   2182846553,
+            2600511768, 2955803355, 2838940570, 3866582365, 4285295644,
+            3561045983, 3445231262, 2508465314, 2359236067, 2813478432,
+            3198777185, 4058571174, 3908292839, 3286139684, 3670389349,
+            1566420650, 1145479147, 1869335592, 1987116393, 959540142,
+            539646703,  185010476,  303839341,  3745920755, 3327985586,
+            3983561841, 4100678960, 3140154359, 2721170102, 2300350837,
+            2416418868, 396344571,  243568058,  631889529,  1018359608,
+            1945336319, 1793607870, 1103436669, 1490954812, 4034481925,
+            3915546180, 3259968903, 3679722694, 2484439553, 2366552896,
+            2787371139, 3208174018, 950060301,  565965900,  177645455,
+            328046286,  1556873225, 1171730760, 1861902987, 2011255754,
+            3132841300, 2745199637, 2290958294, 2442530455, 3738671184,
+            3352078609, 3974232786, 4126854035, 1919080284, 1803150877,
+            1079293406, 1498383519, 370020952,  253043481,  607678682,
+            1025720731, 1711106983, 2095471334, 1472923941, 1322268772,
+            26324643,   411738082,  866634785,  717028704,  2904875439,
+            3024081134, 2668790573, 2248782444, 3376948395, 3495106026,
+            4219356713, 3798300520, 792689142,  908347575,  487136116,
+            68299317,   1263779058, 1380486579, 2036719216, 1618931505,
+            3890672638, 4278043327, 3587215740, 3435896893, 2206873338,
+            2593195963, 2981909624, 2829542713, 998479947,  580430090,
+            162921161,  279890824,  1609522511, 1190423566, 1842954189,
+            1958874764, 4082766403, 3930137346, 3245109441, 3631694208,
+            2536953671, 2385372678, 2768287173, 3155920004, 1900120602,
+            1750776667, 1131931800, 1517083097, 355290910,  204897887,
+            656092572,  1040194781, 3113746450, 2692952403, 2343461520,
+            2461357009, 3723805974, 3304059991, 4022511508, 4141455061,
+            2919742697, 3072101800, 2620513899, 2234183466, 3396041197,
+            3547351212, 4166851439, 3779471918, 1725839073, 2143618976,
+            1424512099, 1307796770, 45282277,   464110244,  813994343,
+            698327078,  3838160568, 4259225593, 3606301754, 3488152955,
+            2158586812, 2578602749, 2996767038, 2877569151, 740041904,
+            889656817,  506086962,  120682355,  1215357364, 1366020341,
+            2051441462, 1667084919, 3422213966, 3538019855, 4190942668,
+            3772220557, 2945847882, 3062702859, 2644537544, 2226864521,
+            52649286,   439905287,  823476164,  672009861,  1733269570,
+            2119477507, 1434057408, 1281543041, 2167981343, 2552493150,
+            3004082077, 2853541596, 3847487515, 4233048410, 3613549209,
+            3464057816, 1239502615, 1358593622, 2077699477, 1657543892,
+            764250643,  882293586,  532408465,  111204816,  1585378284,
+            1197851309, 1816695150, 1968414767, 974272232,  587794345,
+            136598634,  289367339,  2527558116, 2411481253, 2760973158,
+            3179948583, 4073438432, 3956313505, 3237863010, 3655790371,
+            347922877,  229101820,  646611775,  1066513022, 1892689081,
+            1774917112, 1122387515, 1543337850, 3697634229, 3313392372,
+            3998419255, 4148705398, 3087642289, 2702352368, 2319436851,
+            2468674930,
+        },
+        {
+            0,          29518391,   59036782,   38190681,   118073564,
+            114017003,  76381362,   89069189,   236147128,  265370511,
+            228034006,  206958561,  152762724,  148411219,  178138378,
+            190596925,  472294256,  501532999,  530741022,  509615401,
+            456068012,  451764635,  413917122,  426358261,  305525448,
+            334993663,  296822438,  275991697,  356276756,  352202787,
+            381193850,  393929805,  944588512,  965684439,  1003065998,
+            973863097,  1061482044, 1049003019, 1019230802, 1023561829,
+            912136024,  933002607,  903529270,  874031361,  827834244,
+            815125939,  852716522,  856752605,  611050896,  631869351,
+            669987326,  640506825,  593644876,  580921211,  551983394,
+            556069653,  712553512,  733666847,  704405574,  675154545,
+            762387700,  749958851,  787859610,  792175277,  1889177024,
+            1901651959, 1931368878, 1927033753, 2006131996, 1985040171,
+            1947726194, 1976933189, 2122964088, 2135668303, 2098006038,
+            2093965857, 2038461604, 2017599123, 2047123658, 2076625661,
+            1824272048, 1836991623, 1866005214, 1861914857, 1807058540,
+            1786244187, 1748062722, 1777547317, 1655668488, 1668093247,
+            1630251878, 1625932113, 1705433044, 1684323811, 1713505210,
+            1742760333, 1222101792, 1226154263, 1263738702, 1251046777,
+            1339974652, 1310460363, 1281013650, 1301863845, 1187289752,
+            1191637167, 1161842422, 1149379777, 1103966788, 1074747507,
+            1112139306, 1133218845, 1425107024, 1429406311, 1467333694,
+            1454888457, 1408811148, 1379576507, 1350309090, 1371438805,
+            1524775400, 1528845279, 1499917702, 1487177649, 1575719220,
+            1546255107, 1584350554, 1605185389, 3778354048, 3774312887,
+            3803303918, 3816007129, 3862737756, 3892238699, 3854067506,
+            3833203973, 4012263992, 4007927823, 3970080342, 3982554209,
+            3895452388, 3924658387, 3953866378, 3932773565, 4245928176,
+            4241609415, 4271336606, 4283762345, 4196012076, 4225268251,
+            4187931714, 4166823541, 4076923208, 4072833919, 4035198246,
+            4047918865, 4094247316, 4123732899, 4153251322, 4132437965,
+            3648544096, 3636082519, 3673983246, 3678331705, 3732010428,
+            3753090955, 3723829714, 3694611429, 3614117080, 3601426159,
+            3572488374, 3576541825, 3496125444, 3516976691, 3555094634,
+            3525581405, 3311336976, 3298595879, 3336186494, 3340255305,
+            3260503756, 3281337595, 3251864226, 3222399125, 3410866088,
+            3398419871, 3368647622, 3372945905, 3427010420, 3448139075,
+            3485520666, 3456284973, 2444203584, 2423127159, 2452308526,
+            2481530905, 2527477404, 2539934891, 2502093554, 2497740997,
+            2679949304, 2659102159, 2620920726, 2650438049, 2562027300,
+            2574714131, 2603727690, 2599670141, 2374579504, 2353749767,
+            2383274334, 2412743529, 2323684844, 2336421851, 2298759554,
+            2294686645, 2207933576, 2186809023, 2149495014, 2178734801,
+            2224278612, 2236720739, 2266437690, 2262135309, 2850214048,
+            2820717207, 2858812622, 2879680249, 2934667388, 2938704459,
+            2909776914, 2897069605, 2817622296, 2788420399, 2759153014,
+            2780249921, 2700618180, 2704950259, 2742877610, 2730399645,
+            3049550800, 3020298727, 3057690558, 3078802825, 2999835404,
+            3004150075, 2974355298, 2961925461, 3151438440, 3121956959,
+            3092510214, 3113327665, 3168701108, 3172786307, 3210370778,
+            3197646061,
+        },
+        {
+            0,          3099354981, 2852767883, 313896942,  2405603159,
+            937357362,  627793884,  2648127673, 3316918511, 2097696650,
+            1874714724, 3607201537, 1255587768, 4067088605, 3772741427,
+            1482887254, 1343838111, 3903140090, 4195393300, 1118632049,
+            3749429448, 1741137837, 1970407491, 3452858150, 2511175536,
+            756094997,  1067759611, 2266550430, 449832999,  2725482306,
+            2965774508, 142231497,  2687676222, 412010587,  171665333,
+            2995192016, 793786473,  2548850444, 2237264098, 1038456711,
+            1703315409, 3711623348, 3482275674, 1999841343, 3940814982,
+            1381529571, 1089329165, 4166106984, 4029413537, 1217896388,
+            1512189994, 3802027855, 2135519222, 3354724499, 3577784189,
+            1845280792, 899665998,  2367928107, 2677414085, 657096608,
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+            2844163791, 881434553,  1223211618, 3588709140, 3854685070,
+            2026779384, 78583587,   2577462869, 4235025557, 1633861091,
+            486774840,  2148301134, 3600338360, 1268198606, 938871061,
+            2868504675, 3476308643, 1379640277, 777684494,  3008718712,
+            1310168890, 3541595724, 2943964055, 846639841,  1471879201,
+            3400857943, 3067468940, 735723002,  2102298892, 3762382970,
+            2619362721, 19901655,   1692534295, 4193118049, 2240594618,
+            411247564,  681945942,  3047836192, 3385552891, 1422167693,
+            822682701,  2886124859, 3496468704, 1298661782, 469546336,
+            2264093718, 4203901389, 1738379451, 38812283,   2673859341,
+            3812556502, 2117148576, 3268024339, 1606809957, 598006974,
+            3198893512, 3680933640, 1181316734, 973624229,  2802299603,
+            4052944421, 1822222163, 285065864,  2381456382, 3896478014,
+            1966106696, 156323219,  2489232613, 2759337087, 964150537,
+            1159127250, 3625517476, 3184831332, 551242258,  1555722185,
+            3249901247, 2535537225, 170842943,  1984954084, 3946848146,
+            2391651666, 327308324,  1877176831, 4075589769, 263086283,
+            2460058045, 4005602406, 1942963472, 369291216,  2332888742,
+            4151061373, 1784924683, 1022852861, 2717425547, 3717839440,
+            1083595558, 626782694,  3092517008, 3291821387, 1497027645,
+            1763466407, 4094934481, 2289211402, 360544636,  1890636732,
+            3988730570, 2447251217, 215086695,  1514488465, 3343557607,
+            3140191804, 639919946,  1139395978, 3739626748, 2726758695,
+            1065936977,
+        },
+        {
+            0,          3120290792, 2827399569, 293431929,  2323408227,
+            864534155,  586863858,  2600537882, 3481914503, 1987188591,
+            1729068310, 3740575486, 1173727716, 4228805132, 3983743093,
+            1418249117, 1147313999, 4254680231, 3974377182, 1428157750,
+            3458136620, 2011505092, 1721256893, 3747844181, 2347455432,
+            839944224,  594403929,  2593536433, 26687147,   3094146371,
+            2836498234, 283794642,  2294627998, 826205558,  541298447,
+            2578994407, 45702141,   3141697557, 2856315500, 331624836,
+            1196225049, 4273416689, 4023010184, 1446090848, 3442513786,
+            1959480466, 1706436331, 3696098563, 3433538001, 1968994873,
+            1679888448, 3722103720, 1188807858, 4280295258, 3999102243,
+            1470541515, 53374294,   3134568126, 2879970503, 307431215,
+            2303854645, 816436189,  567589284,  2553242188, 3405478781,
+            1929420949, 1652411116, 3682996484, 1082596894, 4185703926,
+            3892424591, 1375368295, 91404282,   3163122706, 2918450795,
+            336584067,  2400113305, 922028401,  663249672,  2658384096,
+            2392450098, 929185754,  639587747,  2682555979, 82149713,
+            3172883129, 2892181696, 362343208,  1091578037, 4176212829,
+            3918960932, 1349337804, 3412872662, 1922537022, 1676344391,
+            3658557359, 1111377379, 4224032267, 3937989746, 1396912026,
+            3359776896, 1908013928, 1623494929, 3644803833, 2377615716,
+            877417100,  623982837,  2630542109, 130804743,  3190831087,
+            2941083030, 381060734,  106748588,  3215393092, 2933549885,
+            388083925,  2350956495, 903570471,  614862430,  2640172470,
+            3386185259, 1882115523, 1632872378, 3634920530, 1135178568,
+            4199721120, 3945775833, 1389631793, 1317531835, 4152109907,
+            3858841898, 1610259138, 3304822232, 2097172016, 1820140617,
+            3582394273, 2165193788, 955639764,  696815021,  2423477829,
+            192043359,  2995356343, 2750736590, 437203750,  182808564,
+            3005133852, 2724453989, 462947725,  2157513367, 962777471,
+            673168134,  2447663342, 3312231283, 2090301595, 1844056802,
+            3557935370, 1326499344, 4142603768, 3885397889, 1584245865,
+            3326266917, 2142836173, 1858371508, 3611272284, 1279175494,
+            4123357358, 3837270743, 1564721471, 164299426,  2955991370,
+            2706223923, 414607579,  2209834945, 978107433,  724686416,
+            2462715320, 2183156074, 1004243586, 715579643,  2472360723,
+            140260361,  2980573153, 2698675608, 421617264,  1302961645,
+            4099032581, 3845074044, 1557460884, 3352688782, 2116952934,
+            1867729183, 3601371895, 2222754758, 1032278062, 754596439,
+            2499928511, 234942117,  3086693709, 2793824052, 528319708,
+            1274365761, 4061043881, 3816027856, 1518873912, 3246989858,
+            2020800970, 1762628531, 3505670235, 3223196809, 2045103969,
+            1754834200, 3512958704, 1247965674, 4086934018, 3806642299,
+            1528765331, 261609486,  3060532198, 2802936223, 518697591,
+            2246819181, 1007707781, 762121468,  2492913428, 213497176,
+            3041029808, 2755593417, 499441441,  2261110843, 1061030867,
+            776167850,  2545465922, 3274734047, 2060165687, 1807140942,
+            3528266662, 1229724860, 4038575956, 3788156205, 1479636677,
+            1222322711, 4045468159, 3764231046, 1504067694, 3265744756,
+            2069664924, 1780612837, 3554288909, 2270357136, 1051278712,
+            802445057,  2519698665, 221152243,  3033880603, 2779263586,
+            475261322,
+        },
+        {
+            0,          2926088593, 2275419491, 701019378,  3560000647,
+            2052709654, 1402038756, 4261017717, 1930665807, 3715829470,
+            4105419308, 1524313021, 2804077512, 155861593,  545453739,
+            2397726522, 3861331614, 1213181711, 1636244477, 3488582252,
+            840331801,  2625561480, 3048626042, 467584747,  2503254481,
+            995897408,  311723186,  3170637091, 1090907478, 4016929991,
+            3332753461, 1758288292, 390036349,  3109546732, 2426363422,
+            1056427919, 3272488954, 1835443819, 1152258713, 3938878216,
+            1680663602, 3393484195, 3817652561, 1306808512, 2954733749,
+            510998820,  935169494,  2580880455, 4044899811, 1601229938,
+            1991794816, 3637571857, 623446372,  2336332021, 2726898695,
+            216120726,  2181814956, 744704829,  95158223,   2881711710,
+            1446680107, 4166125498, 3516576584, 2146575065, 780072698,
+            2148951915, 2849952665, 129384968,  4199529085, 1411853292,
+            2112855838, 3548843663, 1567451573, 4077254692, 3670887638,
+            1957027143, 2304517426, 657765539,  251396177,  2694091200,
+            3361327204, 1714510325, 1341779207, 3784408214, 476611811,
+            2986349938, 2613617024, 899690513,  3142211371, 354600634,
+            1021997640, 2458051545, 1870338988, 3239283261, 3906682575,
+            1186180958, 960597383,  2536053782, 3202459876, 277428597,
+            3983589632, 1125666961, 1792074851, 3300423154, 1246892744,
+            3829039961, 3455203243, 1671079482, 2657312335, 806080478,
+            432241452,  3081497277, 3748049689, 1896751752, 1489409658,
+            4138600427, 190316446,  2772397583, 2365053693, 580864876,
+            2893360214, 35503559,   735381813,  2243795108, 2017747153,
+            3593269568, 4293150130, 1368183843, 1560145396, 4069882981,
+            3680356503, 1966430470, 2295112051, 648294626,  258769936,
+            2701399425, 804156091,  2173100842, 2823706584, 103204425,
+            4225711676, 1438101421, 2088704863, 3524758222, 3134903146,
+            347226875,  1031468553, 2467456920, 1860935661, 3229814396,
+            3914054286, 1193487135, 3385412645, 1738661300, 1315531078,
+            3758225623, 502792354,  3012596019, 2589468097, 875607120,
+            1271043721, 3853125400, 3429020650, 1644831355, 2683558414,
+            832261023,  408158061,  3057348348, 953223622,  2528745559,
+            3211865253, 286899508,  3974120769, 1116263632, 1799381026,
+            3307794867, 2917509143, 59586950,   709201268,  2217549029,
+            2043995280, 3619452161, 4269064691, 1344032866, 3740677976,
+            1889445577, 1498812987, 4148069290, 180845535,  2762992206,
+            2372361916, 588238637,  1921194766, 3706423967, 4112727661,
+            1531686908, 2796705673, 148555288,  554857194,  2407195515,
+            26248257,   2952271312, 2251333922, 676868275,  3584149702,
+            2076793175, 1375858085, 4234771508, 2493785488, 986493953,
+            319029491,  3178008930, 1083533591, 4009621638, 3342158964,
+            1767759333, 3887577823, 1239362382, 1612160956, 3464433197,
+            864482904,  2649647049, 3022443323, 441336490,  1706844275,
+            3419730402, 3793503504, 1282724993, 2978819316, 535149925,
+            908921239,  2554697734, 380632892,  3100077741, 2433735263,
+            1063734222, 3265180603, 1828069930, 1161729752, 3948283721,
+            2207997677, 770953084,  71007118,   2857626143, 1470763626,
+            4190274555, 3490330377, 2120394392, 4035494306, 1591758899,
+            1999168705, 3644880208, 616140069,  2328960180, 2736367686,
+            225524183,
+        },
+};
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_crc32__ieee_hasher__initialize(wuffs_crc32__ieee_hasher* self,
+                                     size_t sizeof_star_self,
+                                     uint64_t wuffs_version,
+                                     uint32_t initialize_flags) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__error__bad_wuffs_version;
+  }
+
+  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+// The whole point of this if-check is to detect an uninitialized *self.
+// We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((initialize_flags &
+         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_crc32__ieee_hasher() {
+  return sizeof(wuffs_crc32__ieee_hasher);
+}
+
+// ---------------- Function Implementations
+
+// -------- func crc32.ieee_hasher.update_u32
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_crc32__ieee_hasher__update_u32(wuffs_crc32__ieee_hasher* self,
+                                     wuffs_base__slice_u8 a_x) {
+  if (!self) {
+    return 0;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return 0;
+  }
+
+  uint32_t v_s = 0;
+  wuffs_base__slice_u8 v_p = {0};
+
+  v_s = (4294967295 ^ self->private_impl.f_state);
+  {
+    wuffs_base__slice_u8 i_slice_p = a_x;
+    v_p = i_slice_p;
+    v_p.len = 16;
+    uint8_t* i_end0_p = i_slice_p.ptr + (i_slice_p.len / 32) * 32;
+    while (v_p.ptr < i_end0_p) {
+      v_s ^=
+          ((((uint32_t)(v_p.ptr[0])) << 0) | (((uint32_t)(v_p.ptr[1])) << 8) |
+           (((uint32_t)(v_p.ptr[2])) << 16) | (((uint32_t)(v_p.ptr[3])) << 24));
+      v_s = (wuffs_crc32__ieee_table[0][v_p.ptr[15]] ^
+             wuffs_crc32__ieee_table[1][v_p.ptr[14]] ^
+             wuffs_crc32__ieee_table[2][v_p.ptr[13]] ^
+             wuffs_crc32__ieee_table[3][v_p.ptr[12]] ^
+             wuffs_crc32__ieee_table[4][v_p.ptr[11]] ^
+             wuffs_crc32__ieee_table[5][v_p.ptr[10]] ^
+             wuffs_crc32__ieee_table[6][v_p.ptr[9]] ^
+             wuffs_crc32__ieee_table[7][v_p.ptr[8]] ^
+             wuffs_crc32__ieee_table[8][v_p.ptr[7]] ^
+             wuffs_crc32__ieee_table[9][v_p.ptr[6]] ^
+             wuffs_crc32__ieee_table[10][v_p.ptr[5]] ^
+             wuffs_crc32__ieee_table[11][v_p.ptr[4]] ^
+             wuffs_crc32__ieee_table[12][(255 & (v_s >> 24))] ^
+             wuffs_crc32__ieee_table[13][(255 & (v_s >> 16))] ^
+             wuffs_crc32__ieee_table[14][(255 & (v_s >> 8))] ^
+             wuffs_crc32__ieee_table[15][(255 & (v_s >> 0))]);
+      v_p.ptr += 16;
+      v_s ^=
+          ((((uint32_t)(v_p.ptr[0])) << 0) | (((uint32_t)(v_p.ptr[1])) << 8) |
+           (((uint32_t)(v_p.ptr[2])) << 16) | (((uint32_t)(v_p.ptr[3])) << 24));
+      v_s = (wuffs_crc32__ieee_table[0][v_p.ptr[15]] ^
+             wuffs_crc32__ieee_table[1][v_p.ptr[14]] ^
+             wuffs_crc32__ieee_table[2][v_p.ptr[13]] ^
+             wuffs_crc32__ieee_table[3][v_p.ptr[12]] ^
+             wuffs_crc32__ieee_table[4][v_p.ptr[11]] ^
+             wuffs_crc32__ieee_table[5][v_p.ptr[10]] ^
+             wuffs_crc32__ieee_table[6][v_p.ptr[9]] ^
+             wuffs_crc32__ieee_table[7][v_p.ptr[8]] ^
+             wuffs_crc32__ieee_table[8][v_p.ptr[7]] ^
+             wuffs_crc32__ieee_table[9][v_p.ptr[6]] ^
+             wuffs_crc32__ieee_table[10][v_p.ptr[5]] ^
+             wuffs_crc32__ieee_table[11][v_p.ptr[4]] ^
+             wuffs_crc32__ieee_table[12][(255 & (v_s >> 24))] ^
+             wuffs_crc32__ieee_table[13][(255 & (v_s >> 16))] ^
+             wuffs_crc32__ieee_table[14][(255 & (v_s >> 8))] ^
+             wuffs_crc32__ieee_table[15][(255 & (v_s >> 0))]);
+      v_p.ptr += 16;
+    }
+    v_p.len = 16;
+    uint8_t* i_end1_p = i_slice_p.ptr + (i_slice_p.len / 16) * 16;
+    while (v_p.ptr < i_end1_p) {
+      v_s ^=
+          ((((uint32_t)(v_p.ptr[0])) << 0) | (((uint32_t)(v_p.ptr[1])) << 8) |
+           (((uint32_t)(v_p.ptr[2])) << 16) | (((uint32_t)(v_p.ptr[3])) << 24));
+      v_s = (wuffs_crc32__ieee_table[0][v_p.ptr[15]] ^
+             wuffs_crc32__ieee_table[1][v_p.ptr[14]] ^
+             wuffs_crc32__ieee_table[2][v_p.ptr[13]] ^
+             wuffs_crc32__ieee_table[3][v_p.ptr[12]] ^
+             wuffs_crc32__ieee_table[4][v_p.ptr[11]] ^
+             wuffs_crc32__ieee_table[5][v_p.ptr[10]] ^
+             wuffs_crc32__ieee_table[6][v_p.ptr[9]] ^
+             wuffs_crc32__ieee_table[7][v_p.ptr[8]] ^
+             wuffs_crc32__ieee_table[8][v_p.ptr[7]] ^
+             wuffs_crc32__ieee_table[9][v_p.ptr[6]] ^
+             wuffs_crc32__ieee_table[10][v_p.ptr[5]] ^
+             wuffs_crc32__ieee_table[11][v_p.ptr[4]] ^
+             wuffs_crc32__ieee_table[12][(255 & (v_s >> 24))] ^
+             wuffs_crc32__ieee_table[13][(255 & (v_s >> 16))] ^
+             wuffs_crc32__ieee_table[14][(255 & (v_s >> 8))] ^
+             wuffs_crc32__ieee_table[15][(255 & (v_s >> 0))]);
+      v_p.ptr += 16;
+    }
+    v_p.len = 1;
+    uint8_t* i_end2_p = i_slice_p.ptr + (i_slice_p.len / 1) * 1;
+    while (v_p.ptr < i_end2_p) {
+      v_s =
+          (wuffs_crc32__ieee_table[0][(((uint8_t)((v_s & 255))) ^ v_p.ptr[0])] ^
+           (v_s >> 8));
+      v_p.ptr += 1;
+    }
+  }
+  self->private_impl.f_state = (4294967295 ^ v_s);
+  return self->private_impl.f_state;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__CRC32)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__DEFLATE)
+
+// ---------------- Status Codes Implementations
+
+const char* wuffs_deflate__error__bad_huffman_code_over_subscribed =
+    "#deflate: bad Huffman code (over-subscribed)";
+const char* wuffs_deflate__error__bad_huffman_code_under_subscribed =
+    "#deflate: bad Huffman code (under-subscribed)";
+const char* wuffs_deflate__error__bad_huffman_code_length_count =
+    "#deflate: bad Huffman code length count";
+const char* wuffs_deflate__error__bad_huffman_code_length_repetition =
+    "#deflate: bad Huffman code length repetition";
+const char* wuffs_deflate__error__bad_huffman_code =
+    "#deflate: bad Huffman code";
+const char* wuffs_deflate__error__bad_huffman_minimum_code_length =
+    "#deflate: bad Huffman minimum code length";
+const char* wuffs_deflate__error__bad_block = "#deflate: bad block";
+const char* wuffs_deflate__error__bad_distance = "#deflate: bad distance";
+const char* wuffs_deflate__error__bad_distance_code_count =
+    "#deflate: bad distance code count";
+const char* wuffs_deflate__error__bad_literal_length_code_count =
+    "#deflate: bad literal/length code count";
+const char* wuffs_deflate__error__inconsistent_stored_block_length =
+    "#deflate: inconsistent stored block length";
+const char* wuffs_deflate__error__missing_end_of_block_code =
+    "#deflate: missing end-of-block code";
+const char* wuffs_deflate__error__no_huffman_codes =
+    "#deflate: no Huffman codes";
+const char*
+    wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state =
+        "#deflate: internal error: inconsistent Huffman decoder state";
+const char* wuffs_deflate__error__internal_error_inconsistent_i_o =
+    "#deflate: internal error: inconsistent I/O";
+const char* wuffs_deflate__error__internal_error_inconsistent_distance =
+    "#deflate: internal error: inconsistent distance";
+const char* wuffs_deflate__error__internal_error_inconsistent_n_bits =
+    "#deflate: internal error: inconsistent n_bits";
+
+// ---------------- Private Consts
+
+static const uint8_t               //
+    wuffs_deflate__code_order[19]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15,
+};
+
+static const uint8_t              //
+    wuffs_deflate__reverse8[256]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        0,   128, 64,  192, 32,  160, 96,  224, 16,  144, 80,  208, 48,  176,
+        112, 240, 8,   136, 72,  200, 40,  168, 104, 232, 24,  152, 88,  216,
+        56,  184, 120, 248, 4,   132, 68,  196, 36,  164, 100, 228, 20,  148,
+        84,  212, 52,  180, 116, 244, 12,  140, 76,  204, 44,  172, 108, 236,
+        28,  156, 92,  220, 60,  188, 124, 252, 2,   130, 66,  194, 34,  162,
+        98,  226, 18,  146, 82,  210, 50,  178, 114, 242, 10,  138, 74,  202,
+        42,  170, 106, 234, 26,  154, 90,  218, 58,  186, 122, 250, 6,   134,
+        70,  198, 38,  166, 102, 230, 22,  150, 86,  214, 54,  182, 118, 246,
+        14,  142, 78,  206, 46,  174, 110, 238, 30,  158, 94,  222, 62,  190,
+        126, 254, 1,   129, 65,  193, 33,  161, 97,  225, 17,  145, 81,  209,
+        49,  177, 113, 241, 9,   137, 73,  201, 41,  169, 105, 233, 25,  153,
+        89,  217, 57,  185, 121, 249, 5,   133, 69,  197, 37,  165, 101, 229,
+        21,  149, 85,  213, 53,  181, 117, 245, 13,  141, 77,  205, 45,  173,
+        109, 237, 29,  157, 93,  221, 61,  189, 125, 253, 3,   131, 67,  195,
+        35,  163, 99,  227, 19,  147, 83,  211, 51,  179, 115, 243, 11,  139,
+        75,  203, 43,  171, 107, 235, 27,  155, 91,  219, 59,  187, 123, 251,
+        7,   135, 71,  199, 39,  167, 103, 231, 23,  151, 87,  215, 55,  183,
+        119, 247, 15,  143, 79,  207, 47,  175, 111, 239, 31,  159, 95,  223,
+        63,  191, 127, 255,
+};
+
+static const uint32_t                       //
+    wuffs_deflate__lcode_magic_numbers[32]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        1073741824, 1073742080, 1073742336, 1073742592, 1073742848, 1073743104,
+        1073743360, 1073743616, 1073743888, 1073744400, 1073744912, 1073745424,
+        1073745952, 1073746976, 1073748000, 1073749024, 1073750064, 1073752112,
+        1073754160, 1073756208, 1073758272, 1073762368, 1073766464, 1073770560,
+        1073774672, 1073782864, 1073791056, 1073799248, 1073807104, 134217728,
+        134217728,  134217728,
+};
+
+static const uint32_t                       //
+    wuffs_deflate__dcode_magic_numbers[32]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        1073741824, 1073742080, 1073742336, 1073742592, 1073742864, 1073743376,
+        1073743904, 1073744928, 1073745968, 1073748016, 1073750080, 1073754176,
+        1073758288, 1073766480, 1073774688, 1073791072, 1073807472, 1073840240,
+        1073873024, 1073938560, 1074004112, 1074135184, 1074266272, 1074528416,
+        1074790576, 1075314864, 1075839168, 1076887744, 1077936336, 1080033488,
+        134217728,  134217728,
+};
+
+#define WUFFS_DEFLATE__HUFFS_TABLE_SIZE 1024
+
+#define WUFFS_DEFLATE__HUFFS_TABLE_MASK 1023
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__decode_blocks(wuffs_deflate__decoder* self,
+                                      wuffs_base__io_buffer* a_dst,
+                                      wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__decode_uncompressed(wuffs_deflate__decoder* self,
+                                            wuffs_base__io_buffer* a_dst,
+                                            wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__init_fixed_huffman(wuffs_deflate__decoder* self);
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__init_dynamic_huffman(wuffs_deflate__decoder* self,
+                                             wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__init_huff(wuffs_deflate__decoder* self,
+                                  uint32_t a_which,
+                                  uint32_t a_n_codes0,
+                                  uint32_t a_n_codes1,
+                                  uint32_t a_base_symbol);
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__decode_huffman_fast(wuffs_deflate__decoder* self,
+                                            wuffs_base__io_buffer* a_dst,
+                                            wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__decode_huffman_slow(wuffs_deflate__decoder* self,
+                                            wuffs_base__io_buffer* a_dst,
+                                            wuffs_base__io_buffer* a_src);
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_deflate__decoder__initialize(wuffs_deflate__decoder* self,
+                                   size_t sizeof_star_self,
+                                   uint64_t wuffs_version,
+                                   uint32_t initialize_flags) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__error__bad_wuffs_version;
+  }
+
+  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+// The whole point of this if-check is to detect an uninitialized *self.
+// We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((initialize_flags &
+         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_deflate__decoder() {
+  return sizeof(wuffs_deflate__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func deflate.decoder.add_history
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_deflate__decoder__add_history(wuffs_deflate__decoder* self,
+                                    wuffs_base__slice_u8 a_hist) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  wuffs_base__slice_u8 v_s = {0};
+  uint64_t v_n_copied = 0;
+  uint32_t v_already_full = 0;
+
+  v_s = a_hist;
+  if (((uint64_t)(v_s.len)) >= 32768) {
+    v_s = wuffs_base__slice_u8__suffix(v_s, 32768);
+    wuffs_base__slice_u8__copy_from_slice(
+        wuffs_base__make_slice_u8(self->private_data.f_history, 32768), v_s);
+    self->private_impl.f_history_index = 32768;
+  } else {
+    v_n_copied = wuffs_base__slice_u8__copy_from_slice(
+        wuffs_base__slice_u8__subslice_i(
+            wuffs_base__make_slice_u8(self->private_data.f_history, 32768),
+            (self->private_impl.f_history_index & 32767)),
+        v_s);
+    if (v_n_copied < ((uint64_t)(v_s.len))) {
+      v_s = wuffs_base__slice_u8__subslice_i(v_s, v_n_copied);
+      v_n_copied = wuffs_base__slice_u8__copy_from_slice(
+          wuffs_base__make_slice_u8(self->private_data.f_history, 32768), v_s);
+      self->private_impl.f_history_index =
+          (((uint32_t)((v_n_copied & 32767))) + 32768);
+    } else {
+      v_already_full = 0;
+      if (self->private_impl.f_history_index >= 32768) {
+        v_already_full = 32768;
+      }
+      self->private_impl.f_history_index =
+          ((self->private_impl.f_history_index & 32767) +
+           ((uint32_t)((v_n_copied & 32767))) + v_already_full);
+    }
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func deflate.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
+wuffs_deflate__decoder__workbuf_len(const wuffs_deflate__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- func deflate.decoder.decode_io_writer
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_deflate__decoder__decode_io_writer(wuffs_deflate__decoder* self,
+                                         wuffs_base__io_buffer* a_dst,
+                                         wuffs_base__io_buffer* a_src,
+                                         wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
+               ? wuffs_base__error__disabled_by_previous_error
+               : wuffs_base__error__initialize_not_called;
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__bad_argument;
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint64_t v_mark = 0;
+  wuffs_base__status v_status = NULL;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_io_writer[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    while (true) {
+      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
+      {
+        if (a_dst) {
+          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+        }
+        wuffs_base__status t_0 =
+            wuffs_deflate__decoder__decode_blocks(self, a_dst, a_src);
+        if (a_dst) {
+          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+        }
+        v_status = t_0;
+      }
+      if (!wuffs_base__status__is_suspension(v_status)) {
+        status = v_status;
+        if (wuffs_base__status__is_error(status)) {
+          goto exit;
+        } else if (wuffs_base__status__is_suspension(status)) {
+          status = wuffs_base__error__cannot_return_a_suspension;
+          goto exit;
+        }
+        goto ok;
+      }
+      wuffs_deflate__decoder__add_history(
+          self, wuffs_base__io__since(
+                    v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)), io0_a_dst));
+      status = v_status;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_io_writer[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_io_writer[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine =
+      wuffs_base__status__is_suspension(status) ? 1 : 0;
+
+  goto exit;
+exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func deflate.decoder.decode_blocks
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__decode_blocks(wuffs_deflate__decoder* self,
+                                      wuffs_base__io_buffer* a_dst,
+                                      wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint32_t v_final = 0;
+  uint32_t v_b0 = 0;
+  uint32_t v_type = 0;
+  wuffs_base__status v_status = NULL;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_blocks[0];
+  if (coro_susp_point) {
+    v_final = self->private_data.s_decode_blocks[0].v_final;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+  label_0_continue:;
+    while (v_final == 0) {
+      while (self->private_impl.f_n_bits < 3) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint32_t t_0 = *iop_a_src++;
+          v_b0 = t_0;
+        }
+        self->private_impl.f_bits |= (v_b0 << self->private_impl.f_n_bits);
+        self->private_impl.f_n_bits += 8;
+      }
+      v_final = (self->private_impl.f_bits & 1);
+      v_type = ((self->private_impl.f_bits >> 1) & 3);
+      self->private_impl.f_bits >>= 3;
+      self->private_impl.f_n_bits -= 3;
+      if (v_type == 0) {
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        status =
+            wuffs_deflate__decoder__decode_uncompressed(self, a_dst, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status) {
+          goto suspend;
+        }
+        goto label_0_continue;
+      } else if (v_type == 1) {
+        v_status = wuffs_deflate__decoder__init_fixed_huffman(self);
+        if (!wuffs_base__status__is_ok(v_status)) {
+          status = v_status;
+          if (wuffs_base__status__is_error(status)) {
+            goto exit;
+          } else if (wuffs_base__status__is_suspension(status)) {
+            status = wuffs_base__error__cannot_return_a_suspension;
+            goto exit;
+          }
+          goto ok;
+        }
+      } else if (v_type == 2) {
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+        status = wuffs_deflate__decoder__init_dynamic_huffman(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status) {
+          goto suspend;
+        }
+      } else {
+        status = wuffs_deflate__error__bad_block;
+        goto exit;
+      }
+      self->private_impl.f_end_of_block = false;
+      while (true) {
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        v_status =
+            wuffs_deflate__decoder__decode_huffman_fast(self, a_dst, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (wuffs_base__status__is_error(v_status)) {
+          status = v_status;
+          goto exit;
+        }
+        if (self->private_impl.f_end_of_block) {
+          goto label_0_continue;
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        status =
+            wuffs_deflate__decoder__decode_huffman_slow(self, a_dst, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status) {
+          goto suspend;
+        }
+        if (self->private_impl.f_end_of_block) {
+          goto label_0_continue;
+        }
+      }
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_blocks[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_blocks[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_data.s_decode_blocks[0].v_final = v_final;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func deflate.decoder.decode_uncompressed
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__decode_uncompressed(wuffs_deflate__decoder* self,
+                                            wuffs_base__io_buffer* a_dst,
+                                            wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint32_t v_length = 0;
+  uint32_t v_n_copied = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_uncompressed[0];
+  if (coro_susp_point) {
+    v_length = self->private_data.s_decode_uncompressed[0].v_length;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if ((self->private_impl.f_n_bits >= 8) ||
+        ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) !=
+         0)) {
+      status = wuffs_deflate__error__internal_error_inconsistent_n_bits;
+      goto exit;
+    }
+    self->private_impl.f_n_bits = 0;
+    self->private_impl.f_bits = 0;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_0 = wuffs_base__load_u32le(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_uncompressed[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch =
+              &self->private_data.s_decode_uncompressed[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
+          if (num_bits_0 == 24) {
+            t_0 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0)) << 56;
+        }
+      }
+      v_length = t_0;
+    }
+    if ((((v_length)&0xFFFF) + ((v_length) >> (32 - (16)))) != 65535) {
+      status = wuffs_deflate__error__inconsistent_stored_block_length;
+      goto exit;
+    }
+    v_length = ((v_length)&0xFFFF);
+    while (true) {
+      v_n_copied = wuffs_base__io_writer__copy_n_from_reader(
+          &iop_a_dst, io2_a_dst, v_length, &iop_a_src, io2_a_src);
+      if (v_length <= v_n_copied) {
+        status = NULL;
+        goto ok;
+      }
+      v_length -= v_n_copied;
+      if (((uint64_t)(io2_a_dst - iop_a_dst)) == 0) {
+        status = wuffs_base__suspension__short_write;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+      } else {
+        status = wuffs_base__suspension__short_read;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
+      }
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_uncompressed[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_uncompressed[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_data.s_decode_uncompressed[0].v_length = v_length;
+
+  goto exit;
+exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func deflate.decoder.init_fixed_huffman
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__init_fixed_huffman(wuffs_deflate__decoder* self) {
+  uint32_t v_i = 0;
+  wuffs_base__status v_status = NULL;
+
+  while (v_i < 144) {
+    self->private_data.f_code_lengths[v_i] = 8;
+    v_i += 1;
+  }
+  while (v_i < 256) {
+    self->private_data.f_code_lengths[v_i] = 9;
+    v_i += 1;
+  }
+  while (v_i < 280) {
+    self->private_data.f_code_lengths[v_i] = 7;
+    v_i += 1;
+  }
+  while (v_i < 288) {
+    self->private_data.f_code_lengths[v_i] = 8;
+    v_i += 1;
+  }
+  while (v_i < 320) {
+    self->private_data.f_code_lengths[v_i] = 5;
+    v_i += 1;
+  }
+  v_status = wuffs_deflate__decoder__init_huff(self, 0, 0, 288, 257);
+  if (wuffs_base__status__is_error(v_status)) {
+    return v_status;
+  }
+  v_status = wuffs_deflate__decoder__init_huff(self, 1, 288, 320, 0);
+  if (wuffs_base__status__is_error(v_status)) {
+    return v_status;
+  }
+  return NULL;
+}
+
+// -------- func deflate.decoder.init_dynamic_huffman
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__init_dynamic_huffman(wuffs_deflate__decoder* self,
+                                             wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint32_t v_bits = 0;
+  uint32_t v_n_bits = 0;
+  uint32_t v_b0 = 0;
+  uint32_t v_n_lit = 0;
+  uint32_t v_n_dist = 0;
+  uint32_t v_n_clen = 0;
+  uint32_t v_i = 0;
+  uint32_t v_b1 = 0;
+  wuffs_base__status v_status = NULL;
+  uint32_t v_mask = 0;
+  uint32_t v_table_entry = 0;
+  uint32_t v_table_entry_n_bits = 0;
+  uint32_t v_b2 = 0;
+  uint32_t v_n_extra_bits = 0;
+  uint8_t v_rep_symbol = 0;
+  uint32_t v_rep_count = 0;
+  uint32_t v_b3 = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_init_dynamic_huffman[0];
+  if (coro_susp_point) {
+    v_bits = self->private_data.s_init_dynamic_huffman[0].v_bits;
+    v_n_bits = self->private_data.s_init_dynamic_huffman[0].v_n_bits;
+    v_n_lit = self->private_data.s_init_dynamic_huffman[0].v_n_lit;
+    v_n_dist = self->private_data.s_init_dynamic_huffman[0].v_n_dist;
+    v_n_clen = self->private_data.s_init_dynamic_huffman[0].v_n_clen;
+    v_i = self->private_data.s_init_dynamic_huffman[0].v_i;
+    v_mask = self->private_data.s_init_dynamic_huffman[0].v_mask;
+    v_table_entry = self->private_data.s_init_dynamic_huffman[0].v_table_entry;
+    v_n_extra_bits =
+        self->private_data.s_init_dynamic_huffman[0].v_n_extra_bits;
+    v_rep_symbol = self->private_data.s_init_dynamic_huffman[0].v_rep_symbol;
+    v_rep_count = self->private_data.s_init_dynamic_huffman[0].v_rep_count;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    v_bits = self->private_impl.f_bits;
+    v_n_bits = self->private_impl.f_n_bits;
+    while (v_n_bits < 14) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__suspension__short_read;
+          goto suspend;
+        }
+        uint32_t t_0 = *iop_a_src++;
+        v_b0 = t_0;
+      }
+      v_bits |= (v_b0 << v_n_bits);
+      v_n_bits += 8;
+    }
+    v_n_lit = (((v_bits)&0x1F) + 257);
+    if (v_n_lit > 286) {
+      status = wuffs_deflate__error__bad_literal_length_code_count;
+      goto exit;
+    }
+    v_bits >>= 5;
+    v_n_dist = (((v_bits)&0x1F) + 1);
+    if (v_n_dist > 30) {
+      status = wuffs_deflate__error__bad_distance_code_count;
+      goto exit;
+    }
+    v_bits >>= 5;
+    v_n_clen = (((v_bits)&0xF) + 4);
+    v_bits >>= 4;
+    v_n_bits -= 14;
+    v_i = 0;
+    while (v_i < v_n_clen) {
+      while (v_n_bits < 3) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint32_t t_1 = *iop_a_src++;
+          v_b1 = t_1;
+        }
+        v_bits |= (v_b1 << v_n_bits);
+        v_n_bits += 8;
+      }
+      self->private_data.f_code_lengths[wuffs_deflate__code_order[v_i]] =
+          ((uint8_t)((v_bits & 7)));
+      v_bits >>= 3;
+      v_n_bits -= 3;
+      v_i += 1;
+    }
+    while (v_i < 19) {
+      self->private_data.f_code_lengths[wuffs_deflate__code_order[v_i]] = 0;
+      v_i += 1;
+    }
+    v_status = wuffs_deflate__decoder__init_huff(self, 0, 0, 19, 4095);
+    if (wuffs_base__status__is_error(v_status)) {
+      status = v_status;
+      goto exit;
+    }
+    v_mask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
+    v_i = 0;
+  label_0_continue:;
+    while (v_i < (v_n_lit + v_n_dist)) {
+      while (true) {
+        v_table_entry = self->private_data.f_huffs[0][(v_bits & v_mask)];
+        v_table_entry_n_bits = (v_table_entry & 15);
+        if (v_n_bits >= v_table_entry_n_bits) {
+          v_bits >>= v_table_entry_n_bits;
+          v_n_bits -= v_table_entry_n_bits;
+          goto label_1_break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint32_t t_2 = *iop_a_src++;
+          v_b2 = t_2;
+        }
+        v_bits |= (v_b2 << v_n_bits);
+        v_n_bits += 8;
+      }
+    label_1_break:;
+      if ((v_table_entry >> 24) != 128) {
+        status =
+            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+        goto exit;
+      }
+      v_table_entry = ((v_table_entry >> 8) & 255);
+      if (v_table_entry < 16) {
+        self->private_data.f_code_lengths[v_i] = ((uint8_t)(v_table_entry));
+        v_i += 1;
+        goto label_0_continue;
+      }
+      v_n_extra_bits = 0;
+      v_rep_symbol = 0;
+      v_rep_count = 0;
+      if (v_table_entry == 16) {
+        v_n_extra_bits = 2;
+        if (v_i <= 0) {
+          status = wuffs_deflate__error__bad_huffman_code_length_repetition;
+          goto exit;
+        }
+        v_rep_symbol = (self->private_data.f_code_lengths[(v_i - 1)] & 15);
+        v_rep_count = 3;
+      } else if (v_table_entry == 17) {
+        v_n_extra_bits = 3;
+        v_rep_symbol = 0;
+        v_rep_count = 3;
+      } else if (v_table_entry == 18) {
+        v_n_extra_bits = 7;
+        v_rep_symbol = 0;
+        v_rep_count = 11;
+      } else {
+        status =
+            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+        goto exit;
+      }
+      while (v_n_bits < v_n_extra_bits) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint32_t t_3 = *iop_a_src++;
+          v_b3 = t_3;
+        }
+        v_bits |= (v_b3 << v_n_bits);
+        v_n_bits += 8;
+      }
+      v_rep_count += ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(v_n_extra_bits));
+      v_bits >>= v_n_extra_bits;
+      v_n_bits -= v_n_extra_bits;
+      while (v_rep_count > 0) {
+        if (v_i >= (v_n_lit + v_n_dist)) {
+          status = wuffs_deflate__error__bad_huffman_code_length_count;
+          goto exit;
+        }
+        self->private_data.f_code_lengths[v_i] = v_rep_symbol;
+        v_i += 1;
+        v_rep_count -= 1;
+      }
+    }
+    if (v_i != (v_n_lit + v_n_dist)) {
+      status = wuffs_deflate__error__bad_huffman_code_length_count;
+      goto exit;
+    }
+    if (self->private_data.f_code_lengths[256] == 0) {
+      status = wuffs_deflate__error__missing_end_of_block_code;
+      goto exit;
+    }
+    v_status = wuffs_deflate__decoder__init_huff(self, 0, 0, v_n_lit, 257);
+    if (wuffs_base__status__is_error(v_status)) {
+      status = v_status;
+      goto exit;
+    }
+    v_status = wuffs_deflate__decoder__init_huff(self, 1, v_n_lit,
+                                                 (v_n_lit + v_n_dist), 0);
+    if (wuffs_base__status__is_error(v_status)) {
+      status = v_status;
+      goto exit;
+    }
+    self->private_impl.f_bits = v_bits;
+    self->private_impl.f_n_bits = v_n_bits;
+
+    goto ok;
+  ok:
+    self->private_impl.p_init_dynamic_huffman[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_init_dynamic_huffman[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_data.s_init_dynamic_huffman[0].v_bits = v_bits;
+  self->private_data.s_init_dynamic_huffman[0].v_n_bits = v_n_bits;
+  self->private_data.s_init_dynamic_huffman[0].v_n_lit = v_n_lit;
+  self->private_data.s_init_dynamic_huffman[0].v_n_dist = v_n_dist;
+  self->private_data.s_init_dynamic_huffman[0].v_n_clen = v_n_clen;
+  self->private_data.s_init_dynamic_huffman[0].v_i = v_i;
+  self->private_data.s_init_dynamic_huffman[0].v_mask = v_mask;
+  self->private_data.s_init_dynamic_huffman[0].v_table_entry = v_table_entry;
+  self->private_data.s_init_dynamic_huffman[0].v_n_extra_bits = v_n_extra_bits;
+  self->private_data.s_init_dynamic_huffman[0].v_rep_symbol = v_rep_symbol;
+  self->private_data.s_init_dynamic_huffman[0].v_rep_count = v_rep_count;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func deflate.decoder.init_huff
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__init_huff(wuffs_deflate__decoder* self,
+                                  uint32_t a_which,
+                                  uint32_t a_n_codes0,
+                                  uint32_t a_n_codes1,
+                                  uint32_t a_base_symbol) {
+  uint16_t v_counts[16] = {0};
+  uint32_t v_i = 0;
+  uint32_t v_remaining = 0;
+  uint16_t v_offsets[16] = {0};
+  uint32_t v_n_symbols = 0;
+  uint32_t v_count = 0;
+  uint16_t v_symbols[320] = {0};
+  uint32_t v_min_cl = 0;
+  uint32_t v_max_cl = 0;
+  uint32_t v_initial_high_bits = 0;
+  uint32_t v_prev_cl = 0;
+  uint32_t v_prev_redirect_key = 0;
+  uint32_t v_top = 0;
+  uint32_t v_next_top = 0;
+  uint32_t v_code = 0;
+  uint32_t v_key = 0;
+  uint32_t v_value = 0;
+  uint32_t v_cl = 0;
+  uint32_t v_redirect_key = 0;
+  uint32_t v_j = 0;
+  uint32_t v_reversed_key = 0;
+  uint32_t v_symbol = 0;
+  uint32_t v_high_bits = 0;
+  uint32_t v_delta = 0;
+
+  v_i = a_n_codes0;
+  while (v_i < a_n_codes1) {
+    if (v_counts[(self->private_data.f_code_lengths[v_i] & 15)] >= 320) {
+      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+    }
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+    v_counts[(self->private_data.f_code_lengths[v_i] & 15)] += 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+    v_i += 1;
+  }
+  if ((((uint32_t)(v_counts[0])) + a_n_codes0) == a_n_codes1) {
+    return wuffs_deflate__error__no_huffman_codes;
+  }
+  v_remaining = 1;
+  v_i = 1;
+  while (v_i <= 15) {
+    if (v_remaining > 1073741824) {
+      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+    }
+    v_remaining <<= 1;
+    if (v_remaining < ((uint32_t)(v_counts[v_i]))) {
+      return wuffs_deflate__error__bad_huffman_code_over_subscribed;
+    }
+    v_remaining -= ((uint32_t)(v_counts[v_i]));
+    v_i += 1;
+  }
+  if (v_remaining != 0) {
+    if ((a_which == 1) && (v_counts[1] == 1) &&
+        (self->private_data.f_code_lengths[a_n_codes0] == 1) &&
+        ((((uint32_t)(v_counts[0])) + a_n_codes0 + 1) == a_n_codes1)) {
+      self->private_impl.f_n_huffs_bits[1] = 1;
+      self->private_data.f_huffs[1][0] =
+          (wuffs_deflate__dcode_magic_numbers[0] | 1);
+      self->private_data.f_huffs[1][1] =
+          (wuffs_deflate__dcode_magic_numbers[31] | 1);
+      return NULL;
+    }
+    return wuffs_deflate__error__bad_huffman_code_under_subscribed;
+  }
+  v_i = 1;
+  while (v_i <= 15) {
+    v_offsets[v_i] = ((uint16_t)(v_n_symbols));
+    v_count = ((uint32_t)(v_counts[v_i]));
+    if (v_n_symbols > (320 - v_count)) {
+      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+    }
+    v_n_symbols = (v_n_symbols + v_count);
+    v_i += 1;
+  }
+  if (v_n_symbols > 288) {
+    return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+  }
+  v_i = a_n_codes0;
+  while (v_i < a_n_codes1) {
+    if (v_i < a_n_codes0) {
+      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+    }
+    if (self->private_data.f_code_lengths[v_i] != 0) {
+      if (v_offsets[(self->private_data.f_code_lengths[v_i] & 15)] >= 320) {
+        return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+      }
+      v_symbols[v_offsets[(self->private_data.f_code_lengths[v_i] & 15)]] =
+          ((uint16_t)((v_i - a_n_codes0)));
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+      v_offsets[(self->private_data.f_code_lengths[v_i] & 15)] += 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+    }
+    v_i += 1;
+  }
+  v_min_cl = 1;
+  while (true) {
+    if (v_counts[v_min_cl] != 0) {
+      goto label_0_break;
+    }
+    if (v_min_cl >= 9) {
+      return wuffs_deflate__error__bad_huffman_minimum_code_length;
+    }
+    v_min_cl += 1;
+  }
+label_0_break:;
+  v_max_cl = 15;
+  while (true) {
+    if (v_counts[v_max_cl] != 0) {
+      goto label_1_break;
+    }
+    if (v_max_cl <= 1) {
+      return wuffs_deflate__error__no_huffman_codes;
+    }
+    v_max_cl -= 1;
+  }
+label_1_break:;
+  if (v_max_cl <= 9) {
+    self->private_impl.f_n_huffs_bits[a_which] = v_max_cl;
+  } else {
+    self->private_impl.f_n_huffs_bits[a_which] = 9;
+  }
+  v_i = 0;
+  if ((v_n_symbols != ((uint32_t)(v_offsets[v_max_cl]))) ||
+      (v_n_symbols != ((uint32_t)(v_offsets[15])))) {
+    return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+  }
+  if ((a_n_codes0 + ((uint32_t)(v_symbols[0]))) >= 320) {
+    return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+  }
+  v_initial_high_bits = 512;
+  if (v_max_cl < 9) {
+    v_initial_high_bits = (((uint32_t)(1)) << v_max_cl);
+  }
+  v_prev_cl = ((uint32_t)((self->private_data.f_code_lengths[(
+                               a_n_codes0 + ((uint32_t)(v_symbols[0])))] &
+                           15)));
+  v_prev_redirect_key = 4294967295;
+  v_top = 0;
+  v_next_top = 512;
+  v_code = 0;
+  v_key = 0;
+  v_value = 0;
+  while (true) {
+    if ((a_n_codes0 + ((uint32_t)(v_symbols[v_i]))) >= 320) {
+      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+    }
+    v_cl = ((uint32_t)((self->private_data.f_code_lengths[(
+                            a_n_codes0 + ((uint32_t)(v_symbols[v_i])))] &
+                        15)));
+    if (v_cl > v_prev_cl) {
+      v_code <<= (v_cl - v_prev_cl);
+      if (v_code >= 32768) {
+        return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+      }
+    }
+    v_prev_cl = v_cl;
+    v_key = v_code;
+    if (v_cl > 9) {
+      v_cl -= 9;
+      v_redirect_key = ((v_key >> v_cl) & 511);
+      v_key = ((v_key)&WUFFS_BASE__LOW_BITS_MASK__U32(v_cl));
+      if (v_prev_redirect_key != v_redirect_key) {
+        v_prev_redirect_key = v_redirect_key;
+        v_remaining = (((uint32_t)(1)) << v_cl);
+        v_j = v_prev_cl;
+        while (v_j <= 15) {
+          if (v_remaining <= ((uint32_t)(v_counts[v_j]))) {
+            goto label_2_break;
+          }
+          v_remaining -= ((uint32_t)(v_counts[v_j]));
+          if (v_remaining > 1073741824) {
+            return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+          }
+          v_remaining <<= 1;
+          v_j += 1;
+        }
+      label_2_break:;
+        if ((v_j <= 9) || (15 < v_j)) {
+          return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+        }
+        v_j -= 9;
+        v_initial_high_bits = (((uint32_t)(1)) << v_j);
+        v_top = v_next_top;
+        if ((v_top + (((uint32_t)(1)) << v_j)) > 1024) {
+          return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+        }
+        v_next_top = (v_top + (((uint32_t)(1)) << v_j));
+        v_redirect_key =
+            (((uint32_t)(wuffs_deflate__reverse8[(v_redirect_key >> 1)])) |
+             ((v_redirect_key & 1) << 8));
+        self->private_data.f_huffs[a_which][v_redirect_key] =
+            (268435465 | (v_top << 8) | (v_j << 4));
+      }
+    }
+    if ((v_key >= 512) || (v_counts[v_prev_cl] <= 0)) {
+      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+    }
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+    v_counts[v_prev_cl] -= 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+    v_reversed_key = (((uint32_t)(wuffs_deflate__reverse8[(v_key >> 1)])) |
+                      ((v_key & 1) << 8));
+    v_reversed_key >>= (9 - v_cl);
+    v_symbol = ((uint32_t)(v_symbols[v_i]));
+    if (v_symbol == 256) {
+      v_value = (536870912 | v_cl);
+    } else if ((v_symbol < 256) && (a_which == 0)) {
+      v_value = (2147483648 | (v_symbol << 8) | v_cl);
+    } else if (v_symbol >= a_base_symbol) {
+      v_symbol -= a_base_symbol;
+      if (a_which == 0) {
+        v_value = (wuffs_deflate__lcode_magic_numbers[(v_symbol & 31)] | v_cl);
+      } else {
+        v_value = (wuffs_deflate__dcode_magic_numbers[(v_symbol & 31)] | v_cl);
+      }
+    } else {
+      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+    }
+    v_high_bits = v_initial_high_bits;
+    v_delta = (((uint32_t)(1)) << v_cl);
+    while (v_high_bits >= v_delta) {
+      v_high_bits -= v_delta;
+      if ((v_top + ((v_high_bits | v_reversed_key) & 511)) >= 1024) {
+        return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+      }
+      self->private_data
+          .f_huffs[a_which][(v_top + ((v_high_bits | v_reversed_key) & 511))] =
+          v_value;
+    }
+    v_i += 1;
+    if (v_i >= v_n_symbols) {
+      goto label_3_break;
+    }
+    v_code += 1;
+    if (v_code >= 32768) {
+      return wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+    }
+  }
+label_3_break:;
+  return NULL;
+}
+
+// -------- func deflate.decoder.decode_huffman_fast
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__decode_huffman_fast(wuffs_deflate__decoder* self,
+                                            wuffs_base__io_buffer* a_dst,
+                                            wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint32_t v_bits = 0;
+  uint32_t v_n_bits = 0;
+  uint32_t v_table_entry = 0;
+  uint32_t v_table_entry_n_bits = 0;
+  uint32_t v_lmask = 0;
+  uint32_t v_dmask = 0;
+  uint32_t v_redir_top = 0;
+  uint32_t v_redir_mask = 0;
+  uint32_t v_length = 0;
+  uint32_t v_dist_minus_1 = 0;
+  uint32_t v_n_copied = 0;
+  uint32_t v_hlen = 0;
+  uint32_t v_hdist = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  if ((self->private_impl.f_n_bits >= 8) ||
+      ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
+    status = wuffs_deflate__error__internal_error_inconsistent_n_bits;
+    goto exit;
+  }
+  v_bits = self->private_impl.f_bits;
+  v_n_bits = self->private_impl.f_n_bits;
+  v_lmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
+  v_dmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
+label_0_continue:;
+  while ((((uint64_t)(io2_a_dst - iop_a_dst)) >= 258) &&
+         (((uint64_t)(io2_a_src - iop_a_src)) >= 12)) {
+    if (v_n_bits < 15) {
+      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+      (iop_a_src += 1, wuffs_base__make_empty_struct());
+      v_n_bits += 8;
+      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+      (iop_a_src += 1, wuffs_base__make_empty_struct());
+      v_n_bits += 8;
+    } else {
+    }
+    v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
+    v_table_entry_n_bits = (v_table_entry & 15);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    if ((v_table_entry >> 31) != 0) {
+      (wuffs_base__store_u8be(iop_a_dst,
+                              ((uint8_t)(((v_table_entry >> 8) & 255)))),
+       iop_a_dst += 1, wuffs_base__make_empty_struct());
+      goto label_0_continue;
+    } else if ((v_table_entry >> 30) != 0) {
+    } else if ((v_table_entry >> 29) != 0) {
+      self->private_impl.f_end_of_block = true;
+      goto label_0_break;
+    } else if ((v_table_entry >> 28) != 0) {
+      if (v_n_bits < 15) {
+        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+        v_n_bits += 8;
+        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+        v_n_bits += 8;
+      } else {
+      }
+      v_redir_top = ((v_table_entry >> 8) & 65535);
+      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+      v_table_entry =
+          self->private_data
+              .f_huffs[0][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
+      v_table_entry_n_bits = (v_table_entry & 15);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+      if ((v_table_entry >> 31) != 0) {
+        (wuffs_base__store_u8be(iop_a_dst,
+                                ((uint8_t)(((v_table_entry >> 8) & 255)))),
+         iop_a_dst += 1, wuffs_base__make_empty_struct());
+        goto label_0_continue;
+      } else if ((v_table_entry >> 30) != 0) {
+      } else if ((v_table_entry >> 29) != 0) {
+        self->private_impl.f_end_of_block = true;
+        goto label_0_break;
+      } else if ((v_table_entry >> 28) != 0) {
+        status =
+            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+        goto exit;
+      } else if ((v_table_entry >> 27) != 0) {
+        status = wuffs_deflate__error__bad_huffman_code;
+        goto exit;
+      } else {
+        status =
+            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+        goto exit;
+      }
+    } else if ((v_table_entry >> 27) != 0) {
+      status = wuffs_deflate__error__bad_huffman_code;
+      goto exit;
+    } else {
+      status =
+          wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+      goto exit;
+    }
+    v_length = (((v_table_entry >> 8) & 255) + 3);
+    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+    if (v_table_entry_n_bits > 0) {
+      if (v_n_bits < 15) {
+        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+        v_n_bits += 8;
+        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+        v_n_bits += 8;
+      } else {
+      }
+      v_length =
+          (((v_length + 253 +
+             ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) &
+            255) +
+           3);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+    } else {
+    }
+    if (v_n_bits < 15) {
+      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+      (iop_a_src += 1, wuffs_base__make_empty_struct());
+      v_n_bits += 8;
+      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+      (iop_a_src += 1, wuffs_base__make_empty_struct());
+      v_n_bits += 8;
+    } else {
+    }
+    v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
+    v_table_entry_n_bits = (v_table_entry & 15);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    if ((v_table_entry >> 28) == 1) {
+      if (v_n_bits < 15) {
+        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+        v_n_bits += 8;
+        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+        v_n_bits += 8;
+      } else {
+      }
+      v_redir_top = ((v_table_entry >> 8) & 65535);
+      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+      v_table_entry =
+          self->private_data
+              .f_huffs[1][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
+      v_table_entry_n_bits = (v_table_entry & 15);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+    } else {
+    }
+    if ((v_table_entry >> 24) != 64) {
+      if ((v_table_entry >> 24) == 8) {
+        status = wuffs_deflate__error__bad_huffman_code;
+        goto exit;
+      }
+      status =
+          wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+      goto exit;
+    }
+    v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
+    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+    if (v_n_bits < v_table_entry_n_bits) {
+      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+      (iop_a_src += 1, wuffs_base__make_empty_struct());
+      v_n_bits += 8;
+      v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+      (iop_a_src += 1, wuffs_base__make_empty_struct());
+      v_n_bits += 8;
+    }
+    v_dist_minus_1 =
+        ((v_dist_minus_1 +
+          ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) &
+         32767);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    v_n_copied = 0;
+    while (true) {
+      if (((uint64_t)((v_dist_minus_1 + 1))) >
+          ((uint64_t)(iop_a_dst - io0_a_dst))) {
+        v_hlen = 0;
+        v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) -
+                               ((uint64_t)(iop_a_dst - io0_a_dst)))));
+        if (v_length > v_hdist) {
+          v_length -= v_hdist;
+          v_hlen = v_hdist;
+        } else {
+          v_hlen = v_length;
+          v_length = 0;
+        }
+        if (self->private_impl.f_history_index < v_hdist) {
+          status = wuffs_deflate__error__bad_distance;
+          goto exit;
+        }
+        v_hdist = (self->private_impl.f_history_index - v_hdist);
+        while (true) {
+          v_n_copied = wuffs_base__io_writer__copy_n_from_slice(
+              &iop_a_dst, io2_a_dst, v_hlen,
+              wuffs_base__slice_u8__subslice_i(
+                  wuffs_base__make_slice_u8(self->private_data.f_history,
+                                            32768),
+                  (v_hdist & 32767)));
+          if (v_hlen <= v_n_copied) {
+            goto label_1_break;
+          }
+          v_hlen -= v_n_copied;
+          wuffs_base__io_writer__copy_n_from_slice(
+              &iop_a_dst, io2_a_dst, v_hlen,
+              wuffs_base__make_slice_u8(self->private_data.f_history, 32768));
+          goto label_1_break;
+        }
+      label_1_break:;
+        if (v_length == 0) {
+          goto label_0_continue;
+        }
+        if (((uint64_t)((v_dist_minus_1 + 1))) >
+            ((uint64_t)(iop_a_dst - io0_a_dst))) {
+          status = wuffs_deflate__error__internal_error_inconsistent_distance;
+          goto exit;
+        }
+      }
+      wuffs_base__io_writer__copy_n_from_history_fast(
+          &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+      goto label_2_break;
+    }
+  label_2_break:;
+  }
+label_0_break:;
+  while (v_n_bits >= 8) {
+    v_n_bits -= 8;
+    if (iop_a_src > io1_a_src) {
+      (iop_a_src--, wuffs_base__make_empty_struct());
+    } else {
+      status = wuffs_deflate__error__internal_error_inconsistent_i_o;
+      goto exit;
+    }
+  }
+  self->private_impl.f_bits = (v_bits & ((((uint32_t)(1)) << v_n_bits) - 1));
+  self->private_impl.f_n_bits = v_n_bits;
+  if ((self->private_impl.f_n_bits >= 8) ||
+      ((self->private_impl.f_bits >> self->private_impl.f_n_bits) != 0)) {
+    status = wuffs_deflate__error__internal_error_inconsistent_n_bits;
+    goto exit;
+  }
+  goto exit;
+exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func deflate.decoder.decode_huffman_slow
+
+static wuffs_base__status  //
+wuffs_deflate__decoder__decode_huffman_slow(wuffs_deflate__decoder* self,
+                                            wuffs_base__io_buffer* a_dst,
+                                            wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint32_t v_bits = 0;
+  uint32_t v_n_bits = 0;
+  uint32_t v_table_entry = 0;
+  uint32_t v_table_entry_n_bits = 0;
+  uint32_t v_lmask = 0;
+  uint32_t v_dmask = 0;
+  uint32_t v_b0 = 0;
+  uint32_t v_redir_top = 0;
+  uint32_t v_redir_mask = 0;
+  uint32_t v_b1 = 0;
+  uint32_t v_length = 0;
+  uint32_t v_b2 = 0;
+  uint32_t v_b3 = 0;
+  uint32_t v_b4 = 0;
+  uint32_t v_dist_minus_1 = 0;
+  uint32_t v_b5 = 0;
+  uint32_t v_n_copied = 0;
+  uint32_t v_hlen = 0;
+  uint32_t v_hdist = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_huffman_slow[0];
+  if (coro_susp_point) {
+    v_bits = self->private_data.s_decode_huffman_slow[0].v_bits;
+    v_n_bits = self->private_data.s_decode_huffman_slow[0].v_n_bits;
+    v_table_entry = self->private_data.s_decode_huffman_slow[0].v_table_entry;
+    v_table_entry_n_bits =
+        self->private_data.s_decode_huffman_slow[0].v_table_entry_n_bits;
+    v_lmask = self->private_data.s_decode_huffman_slow[0].v_lmask;
+    v_dmask = self->private_data.s_decode_huffman_slow[0].v_dmask;
+    v_redir_top = self->private_data.s_decode_huffman_slow[0].v_redir_top;
+    v_redir_mask = self->private_data.s_decode_huffman_slow[0].v_redir_mask;
+    v_length = self->private_data.s_decode_huffman_slow[0].v_length;
+    v_dist_minus_1 = self->private_data.s_decode_huffman_slow[0].v_dist_minus_1;
+    v_hlen = self->private_data.s_decode_huffman_slow[0].v_hlen;
+    v_hdist = self->private_data.s_decode_huffman_slow[0].v_hdist;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if ((self->private_impl.f_n_bits >= 8) ||
+        ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) !=
+         0)) {
+      status = wuffs_deflate__error__internal_error_inconsistent_n_bits;
+      goto exit;
+    }
+    v_bits = self->private_impl.f_bits;
+    v_n_bits = self->private_impl.f_n_bits;
+    v_lmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
+    v_dmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
+  label_0_continue:;
+    while (!(self->private_impl.p_decode_huffman_slow[0] != 0)) {
+      while (true) {
+        v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
+        v_table_entry_n_bits = (v_table_entry & 15);
+        if (v_n_bits >= v_table_entry_n_bits) {
+          v_bits >>= v_table_entry_n_bits;
+          v_n_bits -= v_table_entry_n_bits;
+          goto label_1_break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint32_t t_0 = *iop_a_src++;
+          v_b0 = t_0;
+        }
+        v_bits |= (v_b0 << v_n_bits);
+        v_n_bits += 8;
+      }
+    label_1_break:;
+      if ((v_table_entry >> 31) != 0) {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        if (iop_a_dst == io2_a_dst) {
+          status = wuffs_base__suspension__short_write;
+          goto suspend;
+        }
+        *iop_a_dst++ = ((uint8_t)(((v_table_entry >> 8) & 255)));
+        goto label_0_continue;
+      } else if ((v_table_entry >> 30) != 0) {
+      } else if ((v_table_entry >> 29) != 0) {
+        self->private_impl.f_end_of_block = true;
+        goto label_0_break;
+      } else if ((v_table_entry >> 28) != 0) {
+        v_redir_top = ((v_table_entry >> 8) & 65535);
+        v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+        while (true) {
+          v_table_entry =
+              self->private_data
+                  .f_huffs[0][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
+          v_table_entry_n_bits = (v_table_entry & 15);
+          if (v_n_bits >= v_table_entry_n_bits) {
+            v_bits >>= v_table_entry_n_bits;
+            v_n_bits -= v_table_entry_n_bits;
+            goto label_2_break;
+          }
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__suspension__short_read;
+              goto suspend;
+            }
+            uint32_t t_1 = *iop_a_src++;
+            v_b1 = t_1;
+          }
+          v_bits |= (v_b1 << v_n_bits);
+          v_n_bits += 8;
+        }
+      label_2_break:;
+        if ((v_table_entry >> 31) != 0) {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+          if (iop_a_dst == io2_a_dst) {
+            status = wuffs_base__suspension__short_write;
+            goto suspend;
+          }
+          *iop_a_dst++ = ((uint8_t)(((v_table_entry >> 8) & 255)));
+          goto label_0_continue;
+        } else if ((v_table_entry >> 30) != 0) {
+        } else if ((v_table_entry >> 29) != 0) {
+          self->private_impl.f_end_of_block = true;
+          goto label_0_break;
+        } else if ((v_table_entry >> 28) != 0) {
+          status =
+              wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+          goto exit;
+        } else if ((v_table_entry >> 27) != 0) {
+          status = wuffs_deflate__error__bad_huffman_code;
+          goto exit;
+        } else {
+          status =
+              wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+          goto exit;
+        }
+      } else if ((v_table_entry >> 27) != 0) {
+        status = wuffs_deflate__error__bad_huffman_code;
+        goto exit;
+      } else {
+        status =
+            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+        goto exit;
+      }
+      v_length = (((v_table_entry >> 8) & 255) + 3);
+      v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+      if (v_table_entry_n_bits > 0) {
+        while (v_n_bits < v_table_entry_n_bits) {
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__suspension__short_read;
+              goto suspend;
+            }
+            uint32_t t_2 = *iop_a_src++;
+            v_b2 = t_2;
+          }
+          v_bits |= (v_b2 << v_n_bits);
+          v_n_bits += 8;
+        }
+        v_length = (((v_length + 253 +
+                      ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(
+                          v_table_entry_n_bits))) &
+                     255) +
+                    3);
+        v_bits >>= v_table_entry_n_bits;
+        v_n_bits -= v_table_entry_n_bits;
+      }
+      while (true) {
+        v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
+        v_table_entry_n_bits = (v_table_entry & 15);
+        if (v_n_bits >= v_table_entry_n_bits) {
+          v_bits >>= v_table_entry_n_bits;
+          v_n_bits -= v_table_entry_n_bits;
+          goto label_3_break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint32_t t_3 = *iop_a_src++;
+          v_b3 = t_3;
+        }
+        v_bits |= (v_b3 << v_n_bits);
+        v_n_bits += 8;
+      }
+    label_3_break:;
+      if ((v_table_entry >> 28) == 1) {
+        v_redir_top = ((v_table_entry >> 8) & 65535);
+        v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+        while (true) {
+          v_table_entry =
+              self->private_data
+                  .f_huffs[1][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
+          v_table_entry_n_bits = (v_table_entry & 15);
+          if (v_n_bits >= v_table_entry_n_bits) {
+            v_bits >>= v_table_entry_n_bits;
+            v_n_bits -= v_table_entry_n_bits;
+            goto label_4_break;
+          }
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__suspension__short_read;
+              goto suspend;
+            }
+            uint32_t t_4 = *iop_a_src++;
+            v_b4 = t_4;
+          }
+          v_bits |= (v_b4 << v_n_bits);
+          v_n_bits += 8;
+        }
+      label_4_break:;
+      }
+      if ((v_table_entry >> 24) != 64) {
+        if ((v_table_entry >> 24) == 8) {
+          status = wuffs_deflate__error__bad_huffman_code;
+          goto exit;
+        }
+        status =
+            wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state;
+        goto exit;
+      }
+      v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
+      v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+      if (v_table_entry_n_bits > 0) {
+        while (v_n_bits < v_table_entry_n_bits) {
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__suspension__short_read;
+              goto suspend;
+            }
+            uint32_t t_5 = *iop_a_src++;
+            v_b5 = t_5;
+          }
+          v_bits |= (v_b5 << v_n_bits);
+          v_n_bits += 8;
+        }
+        v_dist_minus_1 =
+            ((v_dist_minus_1 +
+              ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) &
+             32767);
+        v_bits >>= v_table_entry_n_bits;
+        v_n_bits -= v_table_entry_n_bits;
+      }
+      while (true) {
+        if (((uint64_t)((v_dist_minus_1 + 1))) >
+            ((uint64_t)(iop_a_dst - io0_a_dst))) {
+          v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) -
+                                 ((uint64_t)(iop_a_dst - io0_a_dst)))));
+          if (v_length > v_hdist) {
+            v_length -= v_hdist;
+            v_hlen = v_hdist;
+          } else {
+            v_hlen = v_length;
+            v_length = 0;
+          }
+          if (self->private_impl.f_history_index < v_hdist) {
+            status = wuffs_deflate__error__bad_distance;
+            goto exit;
+          }
+          v_hdist = (self->private_impl.f_history_index - v_hdist);
+          while (true) {
+            v_n_copied = wuffs_base__io_writer__copy_n_from_slice(
+                &iop_a_dst, io2_a_dst, v_hlen,
+                wuffs_base__slice_u8__subslice_i(
+                    wuffs_base__make_slice_u8(self->private_data.f_history,
+                                              32768),
+                    (v_hdist & 32767)));
+            if (v_hlen <= v_n_copied) {
+              v_hlen = 0;
+              goto label_5_break;
+            }
+            if (v_n_copied > 0) {
+              v_hlen -= v_n_copied;
+              v_hdist = ((v_hdist + v_n_copied) & 32767);
+              if (v_hdist == 0) {
+                goto label_5_break;
+              }
+            }
+            status = wuffs_base__suspension__short_write;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(9);
+          }
+        label_5_break:;
+          if (v_hlen > 0) {
+            while (true) {
+              v_n_copied = wuffs_base__io_writer__copy_n_from_slice(
+                  &iop_a_dst, io2_a_dst, v_hlen,
+                  wuffs_base__slice_u8__subslice_i(
+                      wuffs_base__make_slice_u8(self->private_data.f_history,
+                                                32768),
+                      (v_hdist & 32767)));
+              if (v_hlen <= v_n_copied) {
+                v_hlen = 0;
+                goto label_6_break;
+              }
+              v_hlen -= v_n_copied;
+              v_hdist += v_n_copied;
+              status = wuffs_base__suspension__short_write;
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
+            }
+          label_6_break:;
+          }
+          if (v_length == 0) {
+            goto label_0_continue;
+          }
+        }
+        v_n_copied = wuffs_base__io_writer__copy_n_from_history(
+            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+        if (v_length <= v_n_copied) {
+          v_length = 0;
+          goto label_7_break;
+        }
+        v_length -= v_n_copied;
+        status = wuffs_base__suspension__short_write;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
+      }
+    label_7_break:;
+    }
+  label_0_break:;
+    self->private_impl.f_bits = v_bits;
+    self->private_impl.f_n_bits = v_n_bits;
+    if ((self->private_impl.f_n_bits >= 8) ||
+        ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) !=
+         0)) {
+      status = wuffs_deflate__error__internal_error_inconsistent_n_bits;
+      goto exit;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_huffman_slow[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_huffman_slow[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_data.s_decode_huffman_slow[0].v_bits = v_bits;
+  self->private_data.s_decode_huffman_slow[0].v_n_bits = v_n_bits;
+  self->private_data.s_decode_huffman_slow[0].v_table_entry = v_table_entry;
+  self->private_data.s_decode_huffman_slow[0].v_table_entry_n_bits =
+      v_table_entry_n_bits;
+  self->private_data.s_decode_huffman_slow[0].v_lmask = v_lmask;
+  self->private_data.s_decode_huffman_slow[0].v_dmask = v_dmask;
+  self->private_data.s_decode_huffman_slow[0].v_redir_top = v_redir_top;
+  self->private_data.s_decode_huffman_slow[0].v_redir_mask = v_redir_mask;
+  self->private_data.s_decode_huffman_slow[0].v_length = v_length;
+  self->private_data.s_decode_huffman_slow[0].v_dist_minus_1 = v_dist_minus_1;
+  self->private_data.s_decode_huffman_slow[0].v_hlen = v_hlen;
+  self->private_data.s_decode_huffman_slow[0].v_hdist = v_hdist;
+
+  goto exit;
+exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__DEFLATE)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__LZW)
+
+// ---------------- Status Codes Implementations
+
+const char* wuffs_lzw__error__bad_code = "#lzw: bad code";
+const char* wuffs_lzw__error__internal_error_inconsistent_i_o =
+    "#lzw: internal error: inconsistent I/O";
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__empty_struct  //
+wuffs_lzw__decoder__read_from(wuffs_lzw__decoder* self,
+                              wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_lzw__decoder__write_to(wuffs_lzw__decoder* self,
+                             wuffs_base__io_buffer* a_dst);
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_lzw__decoder__initialize(wuffs_lzw__decoder* self,
+                               size_t sizeof_star_self,
+                               uint64_t wuffs_version,
+                               uint32_t initialize_flags) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__error__bad_wuffs_version;
+  }
+
+  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+// The whole point of this if-check is to detect an uninitialized *self.
+// We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((initialize_flags &
+         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_lzw__decoder() {
+  return sizeof(wuffs_lzw__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func lzw.decoder.set_literal_width
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_lzw__decoder__set_literal_width(wuffs_lzw__decoder* self, uint32_t a_lw) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (a_lw > 8) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_empty_struct();
+  }
+
+  self->private_impl.f_set_literal_width_arg = (a_lw + 1);
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func lzw.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
+wuffs_lzw__decoder__workbuf_len(const wuffs_lzw__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(0, 0);
+}
+
+// -------- func lzw.decoder.decode_io_writer
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_lzw__decoder__decode_io_writer(wuffs_lzw__decoder* self,
+                                     wuffs_base__io_buffer* a_dst,
+                                     wuffs_base__io_buffer* a_src,
+                                     wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
+               ? wuffs_base__error__disabled_by_previous_error
+               : wuffs_base__error__initialize_not_called;
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__bad_argument;
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint32_t v_i = 0;
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_io_writer[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.f_literal_width = 8;
+    if (self->private_impl.f_set_literal_width_arg > 0) {
+      self->private_impl.f_literal_width =
+          (self->private_impl.f_set_literal_width_arg - 1);
+    }
+    self->private_impl.f_clear_code =
+        (((uint32_t)(1)) << self->private_impl.f_literal_width);
+    self->private_impl.f_end_code = (self->private_impl.f_clear_code + 1);
+    self->private_impl.f_save_code = self->private_impl.f_end_code;
+    self->private_impl.f_prev_code = self->private_impl.f_end_code;
+    self->private_impl.f_width = (self->private_impl.f_literal_width + 1);
+    self->private_impl.f_bits = 0;
+    self->private_impl.f_n_bits = 0;
+    self->private_impl.f_output_ri = 0;
+    self->private_impl.f_output_wi = 0;
+    v_i = 0;
+    while (v_i < self->private_impl.f_clear_code) {
+      self->private_data.f_lm1s[v_i] = 0;
+      self->private_data.f_suffixes[v_i][0] = ((uint8_t)(v_i));
+      v_i += 1;
+    }
+  label_0_continue:;
+    while (true) {
+      wuffs_lzw__decoder__read_from(self, a_src);
+      if (self->private_impl.f_output_wi > 0) {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        status = wuffs_lzw__decoder__write_to(self, a_dst);
+        if (status) {
+          goto suspend;
+        }
+      }
+      if (self->private_impl.f_read_from_return_value == 0) {
+        goto label_0_break;
+      } else if (self->private_impl.f_read_from_return_value == 1) {
+        goto label_0_continue;
+      } else if (self->private_impl.f_read_from_return_value == 2) {
+        status = wuffs_base__suspension__short_read;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+      } else if (self->private_impl.f_read_from_return_value == 3) {
+        status = wuffs_lzw__error__bad_code;
+        goto exit;
+      } else {
+        status = wuffs_lzw__error__internal_error_inconsistent_i_o;
+        goto exit;
+      }
+    }
+  label_0_break:;
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_io_writer[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_io_writer[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine =
+      wuffs_base__status__is_suspension(status) ? 1 : 0;
+
+  goto exit;
+exit:
+  if (wuffs_base__status__is_error(status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func lzw.decoder.read_from
+
+static wuffs_base__empty_struct  //
+wuffs_lzw__decoder__read_from(wuffs_lzw__decoder* self,
+                              wuffs_base__io_buffer* a_src) {
+  uint32_t v_clear_code = 0;
+  uint32_t v_end_code = 0;
+  uint32_t v_save_code = 0;
+  uint32_t v_prev_code = 0;
+  uint32_t v_width = 0;
+  uint32_t v_bits = 0;
+  uint32_t v_n_bits = 0;
+  uint32_t v_output_wi = 0;
+  uint32_t v_code = 0;
+  uint32_t v_c = 0;
+  uint32_t v_o = 0;
+  uint32_t v_steps = 0;
+  uint8_t v_first_byte = 0;
+  uint16_t v_lm1_b = 0;
+  uint16_t v_lm1_a = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  v_clear_code = self->private_impl.f_clear_code;
+  v_end_code = self->private_impl.f_end_code;
+  v_save_code = self->private_impl.f_save_code;
+  v_prev_code = self->private_impl.f_prev_code;
+  v_width = self->private_impl.f_width;
+  v_bits = self->private_impl.f_bits;
+  v_n_bits = self->private_impl.f_n_bits;
+  v_output_wi = self->private_impl.f_output_wi;
+  while (true) {
+    if (v_n_bits < v_width) {
+      if (((uint64_t)(io2_a_src - iop_a_src)) >= 4) {
+        v_bits |= (wuffs_base__load_u32le(iop_a_src) << v_n_bits);
+        (iop_a_src += ((31 - v_n_bits) >> 3), wuffs_base__make_empty_struct());
+        v_n_bits |= 24;
+      } else if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+        self->private_impl.f_read_from_return_value = 2;
+        goto label_0_break;
+      } else {
+        v_bits |= (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+        v_n_bits += 8;
+        if (v_n_bits >= v_width) {
+        } else if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          self->private_impl.f_read_from_return_value = 2;
+          goto label_0_break;
+        } else {
+          v_bits |=
+              (((uint32_t)(wuffs_base__load_u8be(iop_a_src))) << v_n_bits);
+          (iop_a_src += 1, wuffs_base__make_empty_struct());
+          v_n_bits += 8;
+          if (v_n_bits < v_width) {
+            self->private_impl.f_read_from_return_value = 4;
+            goto label_0_break;
+          }
+        }
+      }
+    }
+    v_code = ((v_bits)&WUFFS_BASE__LOW_BITS_MASK__U32(v_width));
+    v_bits >>= v_width;
+    v_n_bits -= v_width;
+    if (v_code < v_clear_code) {
+      self->private_data.f_output[v_output_wi] = ((uint8_t)(v_code));
+      v_output_wi = ((v_output_wi + 1) & 8191);
+      if (v_save_code <= 4095) {
+        v_lm1_a = ((self->private_data.f_lm1s[v_prev_code] + 1) & 4095);
+        self->private_data.f_lm1s[v_save_code] = v_lm1_a;
+        if ((v_lm1_a % 8) != 0) {
+          self->private_impl.f_prefixes[v_save_code] =
+              self->private_impl.f_prefixes[v_prev_code];
+          memcpy(self->private_data.f_suffixes[v_save_code],
+                 self->private_data.f_suffixes[v_prev_code],
+                 sizeof(self->private_data.f_suffixes[v_save_code]));
+          self->private_data.f_suffixes[v_save_code][(v_lm1_a % 8)] =
+              ((uint8_t)(v_code));
+        } else {
+          self->private_impl.f_prefixes[v_save_code] =
+              ((uint16_t)(v_prev_code));
+          self->private_data.f_suffixes[v_save_code][0] = ((uint8_t)(v_code));
+        }
+        v_save_code += 1;
+        if (v_width < 12) {
+          v_width += (1 & (v_save_code >> v_width));
+        }
+        v_prev_code = v_code;
+      }
+    } else if (v_code <= v_end_code) {
+      if (v_code == v_end_code) {
+        self->private_impl.f_read_from_return_value = 0;
+        goto label_0_break;
+      }
+      v_save_code = v_end_code;
+      v_prev_code = v_end_code;
+      v_width = (self->private_impl.f_literal_width + 1);
+    } else if (v_code <= v_save_code) {
+      v_c = v_code;
+      if (v_code == v_save_code) {
+        v_c = v_prev_code;
+      }
+      v_o = ((v_output_wi +
+              (((uint32_t)(self->private_data.f_lm1s[v_c])) & 4294967288)) &
+             8191);
+      v_output_wi =
+          ((v_output_wi + 1 + ((uint32_t)(self->private_data.f_lm1s[v_c]))) &
+           8191);
+      v_steps = (((uint32_t)(self->private_data.f_lm1s[v_c])) >> 3);
+      while (true) {
+        memcpy((self->private_data.f_output) + (v_o),
+               (self->private_data.f_suffixes[v_c]), 8);
+        if (v_steps <= 0) {
+          goto label_1_break;
+        }
+        v_steps -= 1;
+        v_o = ((v_o - 8) & 8191);
+        v_c = ((uint32_t)(self->private_impl.f_prefixes[v_c]));
+      }
+    label_1_break:;
+      v_first_byte = self->private_data.f_suffixes[v_c][0];
+      if (v_code == v_save_code) {
+        self->private_data.f_output[v_output_wi] = v_first_byte;
+        v_output_wi = ((v_output_wi + 1) & 8191);
+      }
+      if (v_save_code <= 4095) {
+        v_lm1_b = ((self->private_data.f_lm1s[v_prev_code] + 1) & 4095);
+        self->private_data.f_lm1s[v_save_code] = v_lm1_b;
+        if ((v_lm1_b % 8) != 0) {
+          self->private_impl.f_prefixes[v_save_code] =
+              self->private_impl.f_prefixes[v_prev_code];
+          memcpy(self->private_data.f_suffixes[v_save_code],
+                 self->private_data.f_suffixes[v_prev_code],
+                 sizeof(self->private_data.f_suffixes[v_save_code]));
+          self->private_data.f_suffixes[v_save_code][(v_lm1_b % 8)] =
+              v_first_byte;
+        } else {
+          self->private_impl.f_prefixes[v_save_code] =
+              ((uint16_t)(v_prev_code));
+          self->private_data.f_suffixes[v_save_code][0] =
+              ((uint8_t)(v_first_byte));
+        }
+        v_save_code += 1;
+        if (v_width < 12) {
+          v_width += (1 & (v_save_code >> v_width));
+        }
+        v_prev_code = v_code;
+      }
+    } else {
+      self->private_impl.f_read_from_return_value = 3;
+      goto label_0_break;
+    }
+    if (v_output_wi > 4095) {
+      self->private_impl.f_read_from_return_value = 1;
+      goto label_0_break;
+    }
+  }
+label_0_break:;
+  if (self->private_impl.f_read_from_return_value != 2) {
+    while (v_n_bits >= 8) {
+      v_n_bits -= 8;
+      if (iop_a_src > io1_a_src) {
+        (iop_a_src--, wuffs_base__make_empty_struct());
+      } else {
+        self->private_impl.f_read_from_return_value = 4;
+        goto label_2_break;
+      }
+    }
+  label_2_break:;
+  }
+  self->private_impl.f_save_code = v_save_code;
+  self->private_impl.f_prev_code = v_prev_code;
+  self->private_impl.f_width = v_width;
+  self->private_impl.f_bits = v_bits;
+  self->private_impl.f_n_bits = v_n_bits;
+  self->private_impl.f_output_wi = v_output_wi;
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func lzw.decoder.write_to
+
+static wuffs_base__status  //
+wuffs_lzw__decoder__write_to(wuffs_lzw__decoder* self,
+                             wuffs_base__io_buffer* a_dst) {
+  wuffs_base__status status = NULL;
+
+  wuffs_base__slice_u8 v_s = {0};
+  uint64_t v_n = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_write_to[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    while (self->private_impl.f_output_wi > 0) {
+      if (self->private_impl.f_output_ri > self->private_impl.f_output_wi) {
+        status = wuffs_lzw__error__internal_error_inconsistent_i_o;
+        goto exit;
+      }
+      v_s = wuffs_base__slice_u8__subslice_ij(
+          wuffs_base__make_slice_u8(self->private_data.f_output, 8199),
+          self->private_impl.f_output_ri, self->private_impl.f_output_wi);
+      v_n = wuffs_base__io_writer__copy_from_slice(&iop_a_dst, io2_a_dst, v_s);
+      if (v_n == ((uint64_t)(v_s.len))) {
+        self->private_impl.f_output_ri = 0;
+        self->private_impl.f_output_wi = 0;
+        status = NULL;
+        goto ok;
+      }
+      self->private_impl.f_output_ri =
+          ((self->private_impl.f_output_ri + ((uint32_t)((v_n & 4294967295)))) &
+           8191);
+      status = wuffs_base__suspension__short_write;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_write_to[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_write_to[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+
+  goto exit;
+exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func lzw.decoder.flush
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__slice_u8  //
+wuffs_lzw__decoder__flush(wuffs_lzw__decoder* self) {
+  if (!self) {
+    return wuffs_base__make_slice_u8(NULL, 0);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_slice_u8(NULL, 0);
+  }
+
+  wuffs_base__slice_u8 v_s = {0};
+
+  if (self->private_impl.f_output_ri <= self->private_impl.f_output_wi) {
+    v_s = wuffs_base__slice_u8__subslice_ij(
+        wuffs_base__make_slice_u8(self->private_data.f_output, 8199),
+        self->private_impl.f_output_ri, self->private_impl.f_output_wi);
+  }
+  self->private_impl.f_output_ri = 0;
+  self->private_impl.f_output_wi = 0;
+  return v_s;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__LZW)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GIF)
+
+// ---------------- Status Codes Implementations
+
+const char* wuffs_gif__error__bad_block = "#gif: bad block";
+const char* wuffs_gif__error__bad_extension_label = "#gif: bad extension label";
+const char* wuffs_gif__error__bad_frame_size = "#gif: bad frame size";
+const char* wuffs_gif__error__bad_graphic_control = "#gif: bad graphic control";
+const char* wuffs_gif__error__bad_header = "#gif: bad header";
+const char* wuffs_gif__error__bad_literal_width = "#gif: bad literal width";
+const char* wuffs_gif__error__bad_palette = "#gif: bad palette";
+const char* wuffs_gif__error__internal_error_inconsistent_ri_wi =
+    "#gif: internal error: inconsistent ri/wi";
+
+// ---------------- Private Consts
+
+static const uint32_t              //
+    wuffs_gif__interlace_start[5]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        4294967295, 1, 2, 4, 0,
+};
+
+static const uint8_t               //
+    wuffs_gif__interlace_delta[5]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        1, 2, 4, 8, 8,
+};
+
+static const uint8_t               //
+    wuffs_gif__interlace_count[5]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        0, 1, 2, 4, 8,
+};
+
+static const uint8_t              //
+    wuffs_gif__animexts1dot0[11]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        65, 78, 73, 77, 69, 88, 84, 83, 49, 46, 48,
+};
+
+static const uint8_t              //
+    wuffs_gif__netscape2dot0[11]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        78, 69, 84, 83, 67, 65, 80, 69, 50, 46, 48,
+};
+
+static const uint8_t            //
+    wuffs_gif__iccrgbg1012[11]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        73, 67, 67, 82, 71, 66, 71, 49, 48, 49, 50,
+};
+
+static const uint8_t           //
+    wuffs_gif__xmpdataxmp[11]  //
+    WUFFS_BASE__POTENTIALLY_UNUSED = {
+        88, 77, 80, 32, 68, 97, 116, 97, 88, 77, 80,
+};
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__status  //
+wuffs_gif__decoder__skip_frame(wuffs_gif__decoder* self,
+                               wuffs_base__io_buffer* a_src);
+
+static wuffs_base__empty_struct  //
+wuffs_gif__decoder__reset_gc(wuffs_gif__decoder* self);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_up_to_id_part1(wuffs_gif__decoder* self,
+                                          wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_header(wuffs_gif__decoder* self,
+                                  wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_lsd(wuffs_gif__decoder* self,
+                               wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_extension(wuffs_gif__decoder* self,
+                                     wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__skip_blocks(wuffs_gif__decoder* self,
+                                wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_ae(wuffs_gif__decoder* self,
+                              wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_gc(wuffs_gif__decoder* self,
+                              wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_id_part0(wuffs_gif__decoder* self,
+                                    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_id_part1(wuffs_gif__decoder* self,
+                                    wuffs_base__pixel_buffer* a_dst,
+                                    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_id_part2(wuffs_gif__decoder* self,
+                                    wuffs_base__pixel_buffer* a_dst,
+                                    wuffs_base__io_buffer* a_src,
+                                    wuffs_base__slice_u8 a_workbuf);
+
+static wuffs_base__status  //
+wuffs_gif__decoder__copy_to_image_buffer(wuffs_gif__decoder* self,
+                                         wuffs_base__pixel_buffer* a_pb,
+                                         wuffs_base__slice_u8 a_src);
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_gif__decoder__initialize(wuffs_gif__decoder* self,
+                               size_t sizeof_star_self,
+                               uint64_t wuffs_version,
+                               uint32_t initialize_flags) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__error__bad_wuffs_version;
+  }
+
+  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+// The whole point of this if-check is to detect an uninitialized *self.
+// We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((initialize_flags &
+         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  {
+    wuffs_base__status z = wuffs_lzw__decoder__initialize(
+        &self->private_data.f_lzw, sizeof(self->private_data.f_lzw),
+        WUFFS_VERSION, initialize_flags);
+    if (z) {
+      return z;
+    }
+  }
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_gif__decoder() {
+  return sizeof(wuffs_gif__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func gif.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_gif__decoder__set_quirk_enabled(wuffs_gif__decoder* self,
+                                      uint32_t a_quirk,
+                                      bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (self->private_impl.f_call_sequence == 0) {
+    if (a_quirk == 1041635328) {
+      self->private_impl.f_quirk_enabled_delay_num_decoded_frames = a_enabled;
+    } else if (a_quirk == 1041635329) {
+      self->private_impl
+          .f_quirk_enabled_first_frame_local_palette_means_black_background =
+          a_enabled;
+    } else if (a_quirk == 1041635330) {
+      self->private_impl.f_quirk_enabled_honor_background_color = a_enabled;
+    } else if (a_quirk == 1041635331) {
+      self->private_impl.f_quirk_enabled_ignore_too_much_pixel_data = a_enabled;
+    } else if (a_quirk == 1041635332) {
+      self->private_impl.f_quirk_enabled_image_bounds_are_strict = a_enabled;
+    } else if (a_quirk == 1041635333) {
+      self->private_impl.f_quirk_enabled_reject_empty_frame = a_enabled;
+    } else if (a_quirk == 1041635334) {
+      self->private_impl.f_quirk_enabled_reject_empty_palette = a_enabled;
+    }
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func gif.decoder.decode_image_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__decode_image_config(wuffs_gif__decoder* self,
+                                        wuffs_base__image_config* a_dst,
+                                        wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
+               ? wuffs_base__error__disabled_by_previous_error
+               : wuffs_base__error__initialize_not_called;
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__bad_argument;
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  bool v_ffio = false;
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence == 0) {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_gif__decoder__decode_header(self, a_src);
+      if (status) {
+        goto suspend;
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      status = wuffs_gif__decoder__decode_lsd(self, a_src);
+      if (status) {
+        goto suspend;
+      }
+    } else if (self->private_impl.f_call_sequence != 2) {
+      status = wuffs_base__error__bad_call_sequence;
+      goto exit;
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+    status = wuffs_gif__decoder__decode_up_to_id_part1(self, a_src);
+    if (status) {
+      goto suspend;
+    }
+    v_ffio = !self->private_impl.f_gc_has_transparent_index;
+    if (!self->private_impl.f_quirk_enabled_honor_background_color) {
+      v_ffio =
+          (v_ffio && (self->private_impl.f_frame_rect_x0 == 0) &&
+           (self->private_impl.f_frame_rect_y0 == 0) &&
+           (self->private_impl.f_frame_rect_x1 == self->private_impl.f_width) &&
+           (self->private_impl.f_frame_rect_y1 == self->private_impl.f_height));
+    } else if (v_ffio) {
+      self->private_impl.f_black_color_u32_argb_premul = 4278190080;
+    }
+    if (self->private_impl.f_background_color_u32_argb_premul == 77) {
+      self->private_impl.f_background_color_u32_argb_premul =
+          self->private_impl.f_black_color_u32_argb_premul;
+    }
+    if (a_dst != NULL) {
+      wuffs_base__image_config__set(
+          a_dst, 1191444488, 0, self->private_impl.f_width,
+          self->private_impl.f_height,
+          self->private_impl.f_frame_config_io_position, v_ffio);
+    }
+    self->private_impl.f_call_sequence = 3;
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_image_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_image_config[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine =
+      wuffs_base__status__is_suspension(status) ? 1 : 0;
+
+  goto exit;
+exit:
+  if (wuffs_base__status__is_error(status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func gif.decoder.set_report_metadata
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_gif__decoder__set_report_metadata(wuffs_gif__decoder* self,
+                                        uint32_t a_fourcc,
+                                        bool a_report) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (a_fourcc == 1229144912) {
+    self->private_impl.f_report_metadata_iccp = a_report;
+  } else if (a_fourcc == 1481461792) {
+    self->private_impl.f_report_metadata_xmp = a_report;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func gif.decoder.ack_metadata_chunk
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__ack_metadata_chunk(wuffs_gif__decoder* self,
+                                       wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
+               ? wuffs_base__error__disabled_by_previous_error
+               : wuffs_base__error__initialize_not_called;
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__bad_argument;
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 2)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_ack_metadata_chunk[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence != 1) {
+      status = wuffs_base__error__bad_call_sequence;
+      goto exit;
+    }
+    if (wuffs_base__u64__sat_add(a_src->meta.pos,
+                                 ((uint64_t)(iop_a_src - io0_a_src))) !=
+        self->private_impl.f_metadata_io_position) {
+      status = wuffs_base__error__bad_i_o_position;
+      goto exit;
+    }
+    if (self->private_impl.f_metadata_chunk_length_value > 0) {
+      while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+        status = wuffs_base__suspension__short_read;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+      }
+      self->private_impl.f_metadata_chunk_length_value =
+          ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
+      if (self->private_impl.f_metadata_chunk_length_value > 0) {
+        if (self->private_impl.f_metadata_fourcc_value == 1481461792) {
+          self->private_impl.f_metadata_chunk_length_value += 1;
+        } else {
+          (iop_a_src += 1, wuffs_base__make_empty_struct());
+        }
+        self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add(
+            wuffs_base__u64__sat_add(a_src->meta.pos,
+                                     ((uint64_t)(iop_a_src - io0_a_src))),
+            self->private_impl.f_metadata_chunk_length_value);
+        status = wuffs_base__warning__metadata_reported;
+        goto ok;
+      }
+      (iop_a_src += 1, wuffs_base__make_empty_struct());
+    }
+    self->private_impl.f_call_sequence = 2;
+    self->private_impl.f_metadata_fourcc_value = 0;
+    self->private_impl.f_metadata_io_position = 0;
+    status = NULL;
+    goto ok;
+    goto ok;
+  ok:
+    self->private_impl.p_ack_metadata_chunk[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_ack_metadata_chunk[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine =
+      wuffs_base__status__is_suspension(status) ? 2 : 0;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func gif.decoder.metadata_fourcc
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_gif__decoder__metadata_fourcc(const wuffs_gif__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return self->private_impl.f_metadata_fourcc_value;
+}
+
+// -------- func gif.decoder.metadata_chunk_length
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_gif__decoder__metadata_chunk_length(const wuffs_gif__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return self->private_impl.f_metadata_chunk_length_value;
+}
+
+// -------- func gif.decoder.num_animation_loops
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_gif__decoder__num_animation_loops(const wuffs_gif__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  if (self->private_impl.f_seen_num_loops) {
+    return self->private_impl.f_num_loops;
+  }
+  return 1;
+}
+
+// -------- func gif.decoder.num_decoded_frame_configs
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_gif__decoder__num_decoded_frame_configs(const wuffs_gif__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return self->private_impl.f_num_decoded_frame_configs_value;
+}
+
+// -------- func gif.decoder.num_decoded_frames
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_gif__decoder__num_decoded_frames(const wuffs_gif__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return self->private_impl.f_num_decoded_frames_value;
+}
+
+// -------- func gif.decoder.frame_dirty_rect
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32  //
+wuffs_gif__decoder__frame_dirty_rect(const wuffs_gif__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__make_rect_ie_u32(0, 0, 0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_rect_ie_u32(0, 0, 0, 0);
+  }
+
+  return wuffs_base__utility__make_rect_ie_u32(
+      wuffs_base__u32__min(self->private_impl.f_frame_rect_x0,
+                           self->private_impl.f_width),
+      wuffs_base__u32__min(self->private_impl.f_frame_rect_y0,
+                           self->private_impl.f_height),
+      wuffs_base__u32__min(self->private_impl.f_frame_rect_x1,
+                           self->private_impl.f_width),
+      wuffs_base__u32__min(self->private_impl.f_dirty_max_excl_y,
+                           self->private_impl.f_height));
+}
+
+// -------- func gif.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
+wuffs_gif__decoder__workbuf_len(const wuffs_gif__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- func gif.decoder.restart_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__restart_frame(wuffs_gif__decoder* self,
+                                  uint64_t a_index,
+                                  uint64_t a_io_position) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
+               ? wuffs_base__error__disabled_by_previous_error
+               : wuffs_base__error__initialize_not_called;
+  }
+
+  if (self->private_impl.f_call_sequence == 0) {
+    return wuffs_base__error__bad_call_sequence;
+  }
+  self->private_impl.f_delayed_num_decoded_frames = false;
+  self->private_impl.f_end_of_data = false;
+  self->private_impl.f_restarted = true;
+  self->private_impl.f_frame_config_io_position = a_io_position;
+  self->private_impl.f_num_decoded_frame_configs_value = a_index;
+  self->private_impl.f_num_decoded_frames_value = a_index;
+  wuffs_gif__decoder__reset_gc(self);
+  return NULL;
+}
+
+// -------- func gif.decoder.decode_frame_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__decode_frame_config(wuffs_gif__decoder* self,
+                                        wuffs_base__frame_config* a_dst,
+                                        wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
+               ? wuffs_base__error__disabled_by_previous_error
+               : wuffs_base__error__initialize_not_called;
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__bad_argument;
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 3)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint8_t v_blend = 0;
+  uint32_t v_background_color = 0;
+  uint8_t v_flags = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
+  if (coro_susp_point) {
+    v_blend = self->private_data.s_decode_frame_config[0].v_blend;
+    v_background_color =
+        self->private_data.s_decode_frame_config[0].v_background_color;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.f_ignore_metadata = true;
+    self->private_impl.f_dirty_max_excl_y = 0;
+    if (!self->private_impl.f_end_of_data) {
+      if (self->private_impl.f_call_sequence == 0) {
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        status = wuffs_gif__decoder__decode_image_config(self, NULL, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status) {
+          goto suspend;
+        }
+      } else if (self->private_impl.f_call_sequence != 3) {
+        if (self->private_impl.f_call_sequence == 4) {
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          status = wuffs_gif__decoder__skip_frame(self, a_src);
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+          if (status) {
+            goto suspend;
+          }
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+        status = wuffs_gif__decoder__decode_up_to_id_part1(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status) {
+          goto suspend;
+        }
+      }
+    }
+    if (self->private_impl.f_end_of_data) {
+      status = wuffs_base__warning__end_of_data;
+      goto ok;
+    }
+    v_blend = 0;
+    v_background_color = self->private_impl.f_black_color_u32_argb_premul;
+    if (!self->private_impl.f_gc_has_transparent_index) {
+      v_blend = 2;
+      v_background_color =
+          self->private_impl.f_background_color_u32_argb_premul;
+      if (self->private_impl
+              .f_quirk_enabled_first_frame_local_palette_means_black_background &&
+          (self->private_impl.f_num_decoded_frame_configs_value == 0)) {
+        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          status = wuffs_base__suspension__short_read;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
+        }
+        v_flags = wuffs_base__load_u8be(iop_a_src);
+        if ((v_flags & 128) != 0) {
+          v_background_color = self->private_impl.f_black_color_u32_argb_premul;
+        }
+      }
+    }
+    if (a_dst != NULL) {
+      wuffs_base__frame_config__update(
+          a_dst,
+          wuffs_base__utility__make_rect_ie_u32(
+              wuffs_base__u32__min(self->private_impl.f_frame_rect_x0,
+                                   self->private_impl.f_width),
+              wuffs_base__u32__min(self->private_impl.f_frame_rect_y0,
+                                   self->private_impl.f_height),
+              wuffs_base__u32__min(self->private_impl.f_frame_rect_x1,
+                                   self->private_impl.f_width),
+              wuffs_base__u32__min(self->private_impl.f_frame_rect_y1,
+                                   self->private_impl.f_height)),
+          ((wuffs_base__flicks)(self->private_impl.f_gc_duration)),
+          self->private_impl.f_num_decoded_frame_configs_value,
+          self->private_impl.f_frame_config_io_position, v_blend,
+          self->private_impl.f_gc_disposal, v_background_color);
+    }
+    wuffs_base__u64__sat_add_indirect(
+        &self->private_impl.f_num_decoded_frame_configs_value, 1);
+    self->private_impl.f_call_sequence = 4;
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_frame_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_frame_config[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine =
+      wuffs_base__status__is_suspension(status) ? 3 : 0;
+  self->private_data.s_decode_frame_config[0].v_blend = v_blend;
+  self->private_data.s_decode_frame_config[0].v_background_color =
+      v_background_color;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func gif.decoder.skip_frame
+
+static wuffs_base__status  //
+wuffs_gif__decoder__skip_frame(wuffs_gif__decoder* self,
+                               wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint8_t v_flags = 0;
+  uint8_t v_lw = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_skip_frame[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_flags = t_0;
+    }
+    if ((v_flags & 128) != 0) {
+      self->private_data.s_skip_frame[0].scratch =
+          (((uint32_t)(3)) << (1 + (v_flags & 7)));
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      if (self->private_data.s_skip_frame[0].scratch >
+          ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_skip_frame[0].scratch -=
+            ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_skip_frame[0].scratch;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_1 = *iop_a_src++;
+      v_lw = t_1;
+    }
+    if (v_lw > 8) {
+      status = wuffs_gif__error__bad_literal_width;
+      goto exit;
+    }
+    if (a_src) {
+      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+    status = wuffs_gif__decoder__skip_blocks(self, a_src);
+    if (a_src) {
+      iop_a_src = a_src->data.ptr + a_src->meta.ri;
+    }
+    if (status) {
+      goto suspend;
+    }
+    if (self->private_impl.f_quirk_enabled_delay_num_decoded_frames) {
+      self->private_impl.f_delayed_num_decoded_frames = true;
+    } else {
+      wuffs_base__u64__sat_add_indirect(
+          &self->private_impl.f_num_decoded_frames_value, 1);
+    }
+    wuffs_gif__decoder__reset_gc(self);
+
+    goto ok;
+  ok:
+    self->private_impl.p_skip_frame[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_skip_frame[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gif__decoder__decode_frame(wuffs_gif__decoder* self,
+                                 wuffs_base__pixel_buffer* a_dst,
+                                 wuffs_base__io_buffer* a_src,
+                                 wuffs_base__slice_u8 a_workbuf,
+                                 wuffs_base__decode_frame_options* a_opts) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
+               ? wuffs_base__error__disabled_by_previous_error
+               : wuffs_base__error__initialize_not_called;
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__bad_argument;
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 4)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.f_ignore_metadata = true;
+    if (self->private_impl.f_call_sequence != 4) {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_gif__decoder__decode_frame_config(self, NULL, a_src);
+      if (status) {
+        goto suspend;
+      }
+    }
+    if (self->private_impl.f_quirk_enabled_reject_empty_frame &&
+        ((self->private_impl.f_frame_rect_x0 ==
+          self->private_impl.f_frame_rect_x1) ||
+         (self->private_impl.f_frame_rect_y0 ==
+          self->private_impl.f_frame_rect_y1))) {
+      status = wuffs_gif__error__bad_frame_size;
+      goto exit;
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+    status = wuffs_gif__decoder__decode_id_part1(self, a_dst, a_src);
+    if (status) {
+      goto suspend;
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+    status = wuffs_gif__decoder__decode_id_part2(self, a_dst, a_src, a_workbuf);
+    if (status) {
+      goto suspend;
+    }
+    wuffs_base__u64__sat_add_indirect(
+        &self->private_impl.f_num_decoded_frames_value, 1);
+    wuffs_gif__decoder__reset_gc(self);
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_frame[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_frame[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine =
+      wuffs_base__status__is_suspension(status) ? 4 : 0;
+
+  goto exit;
+exit:
+  if (wuffs_base__status__is_error(status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func gif.decoder.reset_gc
+
+static wuffs_base__empty_struct  //
+wuffs_gif__decoder__reset_gc(wuffs_gif__decoder* self) {
+  self->private_impl.f_call_sequence = 5;
+  self->private_impl.f_gc_has_transparent_index = false;
+  self->private_impl.f_gc_transparent_index = 0;
+  self->private_impl.f_gc_disposal = 0;
+  self->private_impl.f_gc_duration = 0;
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func gif.decoder.decode_up_to_id_part1
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_up_to_id_part1(wuffs_gif__decoder* self,
+                                          wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint8_t v_block_type = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_up_to_id_part1[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (!self->private_impl.f_restarted) {
+      if (self->private_impl.f_call_sequence != 2) {
+        self->private_impl.f_frame_config_io_position =
+            wuffs_base__u64__sat_add(a_src->meta.pos,
+                                     ((uint64_t)(iop_a_src - io0_a_src)));
+      }
+    } else if (self->private_impl.f_frame_config_io_position !=
+               wuffs_base__u64__sat_add(a_src->meta.pos,
+                                        ((uint64_t)(iop_a_src - io0_a_src)))) {
+      status = wuffs_base__error__bad_restart;
+      goto exit;
+    } else {
+      self->private_impl.f_restarted = false;
+    }
+    while (true) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__suspension__short_read;
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_block_type = t_0;
+      }
+      if (v_block_type == 33) {
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        status = wuffs_gif__decoder__decode_extension(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status) {
+          goto suspend;
+        }
+      } else if (v_block_type == 44) {
+        if (self->private_impl.f_delayed_num_decoded_frames) {
+          self->private_impl.f_delayed_num_decoded_frames = false;
+          wuffs_base__u64__sat_add_indirect(
+              &self->private_impl.f_num_decoded_frames_value, 1);
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+        status = wuffs_gif__decoder__decode_id_part0(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status) {
+          goto suspend;
+        }
+        goto label_0_break;
+      } else if (v_block_type == 59) {
+        if (self->private_impl.f_delayed_num_decoded_frames) {
+          self->private_impl.f_delayed_num_decoded_frames = false;
+          wuffs_base__u64__sat_add_indirect(
+              &self->private_impl.f_num_decoded_frames_value, 1);
+        }
+        self->private_impl.f_end_of_data = true;
+        goto label_0_break;
+      } else {
+        status = wuffs_gif__error__bad_block;
+        goto exit;
+      }
+    }
+  label_0_break:;
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_up_to_id_part1[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_up_to_id_part1[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_header
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_header(wuffs_gif__decoder* self,
+                                  wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint8_t v_c[6] = {0};
+  uint32_t v_i = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_header[0];
+  if (coro_susp_point) {
+    memcpy(v_c, self->private_data.s_decode_header[0].v_c, sizeof(v_c));
+    v_i = self->private_data.s_decode_header[0].v_i;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    while (v_i < 6) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__suspension__short_read;
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_c[v_i] = t_0;
+      }
+      v_i += 1;
+    }
+    if ((v_c[0] != 71) || (v_c[1] != 73) || (v_c[2] != 70) || (v_c[3] != 56) ||
+        ((v_c[4] != 55) && (v_c[4] != 57)) || (v_c[5] != 97)) {
+      status = wuffs_gif__error__bad_header;
+      goto exit;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_header[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_header[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  memcpy(self->private_data.s_decode_header[0].v_c, v_c, sizeof(v_c));
+  self->private_data.s_decode_header[0].v_i = v_i;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_lsd
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_lsd(wuffs_gif__decoder* self,
+                               wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint8_t v_flags = 0;
+  uint8_t v_background_color_index = 0;
+  uint32_t v_num_palette_entries = 0;
+  uint32_t v_i = 0;
+  uint32_t v_j = 0;
+  uint32_t v_argb = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_lsd[0];
+  if (coro_susp_point) {
+    v_flags = self->private_data.s_decode_lsd[0].v_flags;
+    v_background_color_index =
+        self->private_data.s_decode_lsd[0].v_background_color_index;
+    v_num_palette_entries =
+        self->private_data.s_decode_lsd[0].v_num_palette_entries;
+    v_i = self->private_data.s_decode_lsd[0].v_i;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_0 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_lsd[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
+          if (num_bits_0 == 8) {
+            t_0 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0)) << 56;
+        }
+      }
+      self->private_impl.f_width = t_0;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint32_t t_1;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_1 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_lsd[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
+          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
+          if (num_bits_1 == 8) {
+            t_1 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_1 += 8;
+          *scratch |= ((uint64_t)(num_bits_1)) << 56;
+        }
+      }
+      self->private_impl.f_height = t_1;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_2 = *iop_a_src++;
+      v_flags = t_2;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_3 = *iop_a_src++;
+      v_background_color_index = t_3;
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+    if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+      status = wuffs_base__suspension__short_read;
+      goto suspend;
+    }
+    iop_a_src++;
+    v_i = 0;
+    self->private_impl.f_has_global_palette = ((v_flags & 128) != 0);
+    if (self->private_impl.f_has_global_palette) {
+      v_num_palette_entries = (((uint32_t)(1)) << (1 + (v_flags & 7)));
+      while (v_i < v_num_palette_entries) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+          uint32_t t_4;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
+            t_4 = ((uint32_t)(wuffs_base__load_u24be(iop_a_src)));
+            iop_a_src += 3;
+          } else {
+            self->private_data.s_decode_lsd[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__suspension__short_read;
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
+              uint32_t num_bits_4 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_4);
+              if (num_bits_4 == 16) {
+                t_4 = ((uint32_t)(*scratch >> 40));
+                break;
+              }
+              num_bits_4 += 8;
+              *scratch |= ((uint64_t)(num_bits_4));
+            }
+          }
+          v_argb = t_4;
+        }
+        v_argb |= 4278190080;
+        self->private_data.f_palettes[0][((4 * v_i) + 0)] =
+            ((uint8_t)(((v_argb >> 0) & 255)));
+        self->private_data.f_palettes[0][((4 * v_i) + 1)] =
+            ((uint8_t)(((v_argb >> 8) & 255)));
+        self->private_data.f_palettes[0][((4 * v_i) + 2)] =
+            ((uint8_t)(((v_argb >> 16) & 255)));
+        self->private_data.f_palettes[0][((4 * v_i) + 3)] =
+            ((uint8_t)(((v_argb >> 24) & 255)));
+        v_i += 1;
+      }
+      if (self->private_impl.f_quirk_enabled_honor_background_color) {
+        if ((v_background_color_index != 0) &&
+            (((uint32_t)(v_background_color_index)) < v_num_palette_entries)) {
+          v_j = (4 * ((uint32_t)(v_background_color_index)));
+          self->private_impl.f_background_color_u32_argb_premul =
+              ((((uint32_t)(self->private_data.f_palettes[0][(v_j + 0)]))
+                << 0) |
+               (((uint32_t)(self->private_data.f_palettes[0][(v_j + 1)]))
+                << 8) |
+               (((uint32_t)(self->private_data.f_palettes[0][(v_j + 2)]))
+                << 16) |
+               (((uint32_t)(self->private_data.f_palettes[0][(v_j + 3)]))
+                << 24));
+        } else {
+          self->private_impl.f_background_color_u32_argb_premul = 77;
+        }
+      }
+    }
+    while (v_i < 256) {
+      self->private_data.f_palettes[0][((4 * v_i) + 0)] = 0;
+      self->private_data.f_palettes[0][((4 * v_i) + 1)] = 0;
+      self->private_data.f_palettes[0][((4 * v_i) + 2)] = 0;
+      self->private_data.f_palettes[0][((4 * v_i) + 3)] = 255;
+      v_i += 1;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_lsd[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_lsd[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_data.s_decode_lsd[0].v_flags = v_flags;
+  self->private_data.s_decode_lsd[0].v_background_color_index =
+      v_background_color_index;
+  self->private_data.s_decode_lsd[0].v_num_palette_entries =
+      v_num_palette_entries;
+  self->private_data.s_decode_lsd[0].v_i = v_i;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_extension
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_extension(wuffs_gif__decoder* self,
+                                     wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint8_t v_label = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_extension[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_label = t_0;
+    }
+    if (v_label == 249) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      status = wuffs_gif__decoder__decode_gc(self, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status) {
+        goto suspend;
+      }
+      status = NULL;
+      goto ok;
+    } else if (v_label == 255) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      status = wuffs_gif__decoder__decode_ae(self, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status) {
+        goto suspend;
+      }
+      status = NULL;
+      goto ok;
+    }
+    if (a_src) {
+      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+    status = wuffs_gif__decoder__skip_blocks(self, a_src);
+    if (a_src) {
+      iop_a_src = a_src->data.ptr + a_src->meta.ri;
+    }
+    if (status) {
+      goto suspend;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_extension[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_extension[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.skip_blocks
+
+static wuffs_base__status  //
+wuffs_gif__decoder__skip_blocks(wuffs_gif__decoder* self,
+                                wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint8_t v_block_size = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_skip_blocks[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    while (true) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__suspension__short_read;
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_block_size = t_0;
+      }
+      if (v_block_size == 0) {
+        status = NULL;
+        goto ok;
+      }
+      self->private_data.s_skip_blocks[0].scratch = ((uint32_t)(v_block_size));
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      if (self->private_data.s_skip_blocks[0].scratch >
+          ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_skip_blocks[0].scratch -=
+            ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_skip_blocks[0].scratch;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_skip_blocks[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_skip_blocks[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_ae
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_ae(wuffs_gif__decoder* self,
+                              wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint8_t v_c = 0;
+  uint8_t v_block_size = 0;
+  bool v_is_animexts = false;
+  bool v_is_netscape = false;
+  bool v_is_iccp = false;
+  bool v_is_xmp = false;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_ae[0];
+  if (coro_susp_point) {
+    v_block_size = self->private_data.s_decode_ae[0].v_block_size;
+    v_is_animexts = self->private_data.s_decode_ae[0].v_is_animexts;
+    v_is_netscape = self->private_data.s_decode_ae[0].v_is_netscape;
+    v_is_iccp = self->private_data.s_decode_ae[0].v_is_iccp;
+    v_is_xmp = self->private_data.s_decode_ae[0].v_is_xmp;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    while (true) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__suspension__short_read;
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_block_size = t_0;
+      }
+      if (v_block_size == 0) {
+        status = NULL;
+        goto ok;
+      }
+      if (v_block_size != 11) {
+        self->private_data.s_decode_ae[0].scratch = ((uint32_t)(v_block_size));
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        if (self->private_data.s_decode_ae[0].scratch >
+            ((uint64_t)(io2_a_src - iop_a_src))) {
+          self->private_data.s_decode_ae[0].scratch -=
+              ((uint64_t)(io2_a_src - iop_a_src));
+          iop_a_src = io2_a_src;
+          status = wuffs_base__suspension__short_read;
+          goto suspend;
+        }
+        iop_a_src += self->private_data.s_decode_ae[0].scratch;
+        goto label_0_break;
+      }
+      v_is_animexts = true;
+      v_is_netscape = true;
+      v_is_iccp = true;
+      v_is_xmp = true;
+      v_block_size = 0;
+      while (v_block_size < 11) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint8_t t_1 = *iop_a_src++;
+          v_c = t_1;
+        }
+        v_is_animexts =
+            (v_is_animexts && (v_c == wuffs_gif__animexts1dot0[v_block_size]));
+        v_is_netscape =
+            (v_is_netscape && (v_c == wuffs_gif__netscape2dot0[v_block_size]));
+        v_is_iccp =
+            (v_is_iccp && (v_c == wuffs_gif__iccrgbg1012[v_block_size]));
+        v_is_xmp = (v_is_xmp && (v_c == wuffs_gif__xmpdataxmp[v_block_size]));
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+        v_block_size += 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+      }
+      if (v_is_animexts || v_is_netscape) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint8_t t_2 = *iop_a_src++;
+          v_block_size = t_2;
+        }
+        if (v_block_size != 3) {
+          self->private_data.s_decode_ae[0].scratch =
+              ((uint32_t)(v_block_size));
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+          if (self->private_data.s_decode_ae[0].scratch >
+              ((uint64_t)(io2_a_src - iop_a_src))) {
+            self->private_data.s_decode_ae[0].scratch -=
+                ((uint64_t)(io2_a_src - iop_a_src));
+            iop_a_src = io2_a_src;
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          iop_a_src += self->private_data.s_decode_ae[0].scratch;
+          goto label_0_break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint8_t t_3 = *iop_a_src++;
+          v_c = t_3;
+        }
+        if (v_c != 1) {
+          self->private_data.s_decode_ae[0].scratch = 2;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+          if (self->private_data.s_decode_ae[0].scratch >
+              ((uint64_t)(io2_a_src - iop_a_src))) {
+            self->private_data.s_decode_ae[0].scratch -=
+                ((uint64_t)(io2_a_src - iop_a_src));
+            iop_a_src = io2_a_src;
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          iop_a_src += self->private_data.s_decode_ae[0].scratch;
+          goto label_0_break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+          uint32_t t_4;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+            t_4 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
+            iop_a_src += 2;
+          } else {
+            self->private_data.s_decode_ae[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__suspension__short_read;
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_ae[0].scratch;
+              uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
+              *scratch <<= 8;
+              *scratch >>= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
+              if (num_bits_4 == 8) {
+                t_4 = ((uint32_t)(*scratch));
+                break;
+              }
+              num_bits_4 += 8;
+              *scratch |= ((uint64_t)(num_bits_4)) << 56;
+            }
+          }
+          self->private_impl.f_num_loops = t_4;
+        }
+        self->private_impl.f_seen_num_loops = true;
+        if ((0 < self->private_impl.f_num_loops) &&
+            (self->private_impl.f_num_loops <= 65535)) {
+          self->private_impl.f_num_loops += 1;
+        }
+      } else if (self->private_impl.f_ignore_metadata) {
+      } else if (v_is_iccp && self->private_impl.f_report_metadata_iccp) {
+        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          status = wuffs_base__suspension__short_read;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
+        }
+        self->private_impl.f_metadata_chunk_length_value =
+            ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+        self->private_impl.f_metadata_fourcc_value = 1229144912;
+        self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add(
+            wuffs_base__u64__sat_add(a_src->meta.pos,
+                                     ((uint64_t)(iop_a_src - io0_a_src))),
+            self->private_impl.f_metadata_chunk_length_value);
+        self->private_impl.f_call_sequence = 1;
+        status = wuffs_base__warning__metadata_reported;
+        goto ok;
+      } else if (v_is_xmp && self->private_impl.f_report_metadata_xmp) {
+        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          status = wuffs_base__suspension__short_read;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
+        }
+        self->private_impl.f_metadata_chunk_length_value =
+            ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
+        if (self->private_impl.f_metadata_chunk_length_value > 0) {
+          self->private_impl.f_metadata_chunk_length_value += 1;
+        } else {
+          (iop_a_src += 1, wuffs_base__make_empty_struct());
+        }
+        self->private_impl.f_metadata_fourcc_value = 1481461792;
+        self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add(
+            wuffs_base__u64__sat_add(a_src->meta.pos,
+                                     ((uint64_t)(iop_a_src - io0_a_src))),
+            self->private_impl.f_metadata_chunk_length_value);
+        self->private_impl.f_call_sequence = 1;
+        status = wuffs_base__warning__metadata_reported;
+        goto ok;
+      }
+      goto label_0_break;
+    }
+  label_0_break:;
+    if (a_src) {
+      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(12);
+    status = wuffs_gif__decoder__skip_blocks(self, a_src);
+    if (a_src) {
+      iop_a_src = a_src->data.ptr + a_src->meta.ri;
+    }
+    if (status) {
+      goto suspend;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_ae[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_ae[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_data.s_decode_ae[0].v_block_size = v_block_size;
+  self->private_data.s_decode_ae[0].v_is_animexts = v_is_animexts;
+  self->private_data.s_decode_ae[0].v_is_netscape = v_is_netscape;
+  self->private_data.s_decode_ae[0].v_is_iccp = v_is_iccp;
+  self->private_data.s_decode_ae[0].v_is_xmp = v_is_xmp;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_gc
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_gc(wuffs_gif__decoder* self,
+                              wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint8_t v_c = 0;
+  uint8_t v_flags = 0;
+  uint16_t v_gc_duration_centiseconds = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_gc[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_c = t_0;
+    }
+    if (v_c != 4) {
+      status = wuffs_gif__error__bad_graphic_control;
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_1 = *iop_a_src++;
+      v_flags = t_1;
+    }
+    self->private_impl.f_gc_has_transparent_index = ((v_flags & 1) != 0);
+    v_flags = ((v_flags >> 2) & 7);
+    if (v_flags == 2) {
+      self->private_impl.f_gc_disposal = 1;
+    } else if ((v_flags == 3) || (v_flags == 4)) {
+      self->private_impl.f_gc_disposal = 2;
+    } else {
+      self->private_impl.f_gc_disposal = 0;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint16_t t_2;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_2 = wuffs_base__load_u16le(iop_a_src);
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_gc[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_gc[0].scratch;
+          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
+          if (num_bits_2 == 8) {
+            t_2 = ((uint16_t)(*scratch));
+            break;
+          }
+          num_bits_2 += 8;
+          *scratch |= ((uint64_t)(num_bits_2)) << 56;
+        }
+      }
+      v_gc_duration_centiseconds = t_2;
+    }
+    self->private_impl.f_gc_duration =
+        (((uint64_t)(v_gc_duration_centiseconds)) * 7056000);
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_3 = *iop_a_src++;
+      self->private_impl.f_gc_transparent_index = t_3;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_4 = *iop_a_src++;
+      v_c = t_4;
+    }
+    if (v_c != 0) {
+      status = wuffs_gif__error__bad_graphic_control;
+      goto exit;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_gc[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_gc[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_id_part0
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_id_part0(wuffs_gif__decoder* self,
+                                    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_id_part0[0];
+  if (coro_susp_point) {
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_0 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_id_part0[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
+          if (num_bits_0 == 8) {
+            t_0 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0)) << 56;
+        }
+      }
+      self->private_impl.f_frame_rect_x0 = t_0;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint32_t t_1;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_1 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_id_part0[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
+          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
+          if (num_bits_1 == 8) {
+            t_1 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_1 += 8;
+          *scratch |= ((uint64_t)(num_bits_1)) << 56;
+        }
+      }
+      self->private_impl.f_frame_rect_y0 = t_1;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      uint32_t t_2;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_2 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_id_part0[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
+          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
+          if (num_bits_2 == 8) {
+            t_2 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_2 += 8;
+          *scratch |= ((uint64_t)(num_bits_2)) << 56;
+        }
+      }
+      self->private_impl.f_frame_rect_x1 = t_2;
+    }
+    self->private_impl.f_frame_rect_x1 += self->private_impl.f_frame_rect_x0;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+      uint32_t t_3;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_3 = ((uint32_t)(wuffs_base__load_u16le(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_id_part0[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
+          uint32_t num_bits_3 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_3;
+          if (num_bits_3 == 8) {
+            t_3 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_3 += 8;
+          *scratch |= ((uint64_t)(num_bits_3)) << 56;
+        }
+      }
+      self->private_impl.f_frame_rect_y1 = t_3;
+    }
+    self->private_impl.f_frame_rect_y1 += self->private_impl.f_frame_rect_y0;
+    self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
+    self->private_impl.f_dst_y = self->private_impl.f_frame_rect_y0;
+    if ((self->private_impl.f_call_sequence == 0) &&
+        !self->private_impl.f_quirk_enabled_image_bounds_are_strict) {
+      self->private_impl.f_width = wuffs_base__u32__max(
+          self->private_impl.f_width, self->private_impl.f_frame_rect_x1);
+      self->private_impl.f_height = wuffs_base__u32__max(
+          self->private_impl.f_height, self->private_impl.f_frame_rect_y1);
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_id_part0[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_id_part0[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_id_part1
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_id_part1(wuffs_gif__decoder* self,
+                                    wuffs_base__pixel_buffer* a_dst,
+                                    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = NULL;
+
+  uint8_t v_flags = 0;
+  uint8_t v_which_palette = 0;
+  uint32_t v_num_palette_entries = 0;
+  uint32_t v_i = 0;
+  uint32_t v_argb = 0;
+  wuffs_base__slice_u8 v_dst_palette = {0};
+  wuffs_base__status v_status = NULL;
+  uint8_t v_lw = 0;
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_id_part1[0];
+  if (coro_susp_point) {
+    v_which_palette = self->private_data.s_decode_id_part1[0].v_which_palette;
+    v_num_palette_entries =
+        self->private_data.s_decode_id_part1[0].v_num_palette_entries;
+    v_i = self->private_data.s_decode_id_part1[0].v_i;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_flags = t_0;
+    }
+    if ((v_flags & 64) != 0) {
+      self->private_impl.f_interlace = 4;
+    } else {
+      self->private_impl.f_interlace = 0;
+    }
+    v_which_palette = 1;
+    if ((v_flags & 128) != 0) {
+      v_num_palette_entries = (((uint32_t)(1)) << (1 + (v_flags & 7)));
+      v_i = 0;
+      while (v_i < v_num_palette_entries) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          uint32_t t_1;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
+            t_1 = ((uint32_t)(wuffs_base__load_u24be(iop_a_src)));
+            iop_a_src += 3;
+          } else {
+            self->private_data.s_decode_id_part1[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__suspension__short_read;
+                goto suspend;
+              }
+              uint64_t* scratch =
+                  &self->private_data.s_decode_id_part1[0].scratch;
+              uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
+              if (num_bits_1 == 16) {
+                t_1 = ((uint32_t)(*scratch >> 40));
+                break;
+              }
+              num_bits_1 += 8;
+              *scratch |= ((uint64_t)(num_bits_1));
+            }
+          }
+          v_argb = t_1;
+        }
+        v_argb |= 4278190080;
+        self->private_data.f_palettes[1][((4 * v_i) + 0)] =
+            ((uint8_t)(((v_argb >> 0) & 255)));
+        self->private_data.f_palettes[1][((4 * v_i) + 1)] =
+            ((uint8_t)(((v_argb >> 8) & 255)));
+        self->private_data.f_palettes[1][((4 * v_i) + 2)] =
+            ((uint8_t)(((v_argb >> 16) & 255)));
+        self->private_data.f_palettes[1][((4 * v_i) + 3)] =
+            ((uint8_t)(((v_argb >> 24) & 255)));
+        v_i += 1;
+      }
+      while (v_i < 256) {
+        self->private_data.f_palettes[1][((4 * v_i) + 0)] = 0;
+        self->private_data.f_palettes[1][((4 * v_i) + 1)] = 0;
+        self->private_data.f_palettes[1][((4 * v_i) + 2)] = 0;
+        self->private_data.f_palettes[1][((4 * v_i) + 3)] = 255;
+        v_i += 1;
+      }
+    } else if (self->private_impl.f_quirk_enabled_reject_empty_palette &&
+               !self->private_impl.f_has_global_palette) {
+      status = wuffs_gif__error__bad_palette;
+      goto exit;
+    } else if (self->private_impl.f_gc_has_transparent_index) {
+      wuffs_base__slice_u8__copy_from_slice(
+          wuffs_base__make_slice_u8(self->private_data.f_palettes[1], 1024),
+          wuffs_base__make_slice_u8(self->private_data.f_palettes[0], 1024));
+    } else {
+      v_which_palette = 0;
+    }
+    if (self->private_impl.f_gc_has_transparent_index) {
+      self->private_data.f_palettes[1][(
+          (4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 0)] =
+          0;
+      self->private_data.f_palettes[1][(
+          (4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 1)] =
+          0;
+      self->private_data.f_palettes[1][(
+          (4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 2)] =
+          0;
+      self->private_data.f_palettes[1][(
+          (4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 3)] =
+          0;
+    }
+    v_dst_palette = wuffs_base__pixel_buffer__palette(a_dst);
+    if (((uint64_t)(v_dst_palette.len)) == 0) {
+      v_dst_palette =
+          wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024);
+    }
+    v_status = wuffs_base__pixel_swizzler__prepare(
+        &self->private_impl.f_swizzler,
+        wuffs_base__pixel_buffer__pixel_format(a_dst), v_dst_palette,
+        1191444488,
+        wuffs_base__make_slice_u8(
+            self->private_data.f_palettes[v_which_palette], 1024));
+    if (!wuffs_base__status__is_ok(v_status)) {
+      status = v_status;
+      if (wuffs_base__status__is_error(status)) {
+        goto exit;
+      } else if (wuffs_base__status__is_suspension(status)) {
+        status = wuffs_base__error__cannot_return_a_suspension;
+        goto exit;
+      }
+      goto ok;
+    }
+    if (self->private_impl.f_previous_lzw_decode_ended_abruptly) {
+      wuffs_base__ignore_status(wuffs_lzw__decoder__initialize(
+          &self->private_data.f_lzw, sizeof(wuffs_lzw__decoder), WUFFS_VERSION,
+          0));
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_2 = *iop_a_src++;
+      v_lw = t_2;
+    }
+    if (v_lw > 8) {
+      status = wuffs_gif__error__bad_literal_width;
+      goto exit;
+    }
+    wuffs_lzw__decoder__set_literal_width(&self->private_data.f_lzw,
+                                          ((uint32_t)(v_lw)));
+    self->private_impl.f_previous_lzw_decode_ended_abruptly = true;
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_id_part1[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_id_part1[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_data.s_decode_id_part1[0].v_which_palette = v_which_palette;
+  self->private_data.s_decode_id_part1[0].v_num_palette_entries =
+      v_num_palette_entries;
+  self->private_data.s_decode_id_part1[0].v_i = v_i;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_id_part2
+
+static wuffs_base__status  //
+wuffs_gif__decoder__decode_id_part2(wuffs_gif__decoder* self,
+                                    wuffs_base__pixel_buffer* a_dst,
+                                    wuffs_base__io_buffer* a_src,
+                                    wuffs_base__slice_u8 a_workbuf) {
+  wuffs_base__status status = NULL;
+
+  uint64_t v_block_size = 0;
+  bool v_need_block_size = false;
+  uint64_t v_n_compressed = 0;
+  wuffs_base__slice_u8 v_compressed = {0};
+  wuffs_base__io_buffer u_r = wuffs_base__empty_io_buffer();
+  wuffs_base__io_buffer* v_r = &u_r;
+  uint8_t* iop_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io0_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint64_t v_mark = 0;
+  wuffs_base__status v_lzw_status = NULL;
+  wuffs_base__status v_copy_status = NULL;
+  wuffs_base__slice_u8 v_uncompressed = {0};
+
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  wuffs_base__io_buffer empty_io_buffer = wuffs_base__empty_io_buffer();
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_id_part2[0];
+  if (coro_susp_point) {
+    v_block_size = self->private_data.s_decode_id_part2[0].v_block_size;
+    v_need_block_size =
+        self->private_data.s_decode_id_part2[0].v_need_block_size;
+    v_lzw_status = self->private_data.s_decode_id_part2[0].v_lzw_status;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    v_need_block_size = true;
+  label_0_continue:;
+    while (true) {
+      if (v_need_block_size) {
+        v_need_block_size = false;
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t t_0 = *iop_a_src++;
+          v_block_size = t_0;
+        }
+      }
+      if (v_block_size == 0) {
+        goto label_0_break;
+      }
+      while (((uint64_t)(io2_a_src - iop_a_src)) == 0) {
+        status = wuffs_base__suspension__short_read;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+      }
+      if (self->private_impl.f_compressed_ri ==
+          self->private_impl.f_compressed_wi) {
+        self->private_impl.f_compressed_ri = 0;
+        self->private_impl.f_compressed_wi = 0;
+      }
+      while (self->private_impl.f_compressed_wi <= 3841) {
+        v_n_compressed = wuffs_base__u64__min(
+            v_block_size, ((uint64_t)(io2_a_src - iop_a_src)));
+        if (v_n_compressed <= 0) {
+          goto label_1_break;
+        }
+        v_compressed =
+            wuffs_base__io_reader__take(&iop_a_src, io2_a_src, v_n_compressed);
+        wuffs_base__slice_u8__copy_from_slice(
+            wuffs_base__slice_u8__subslice_i(
+                wuffs_base__make_slice_u8(self->private_data.f_compressed,
+                                          4096),
+                self->private_impl.f_compressed_wi),
+            v_compressed);
+        wuffs_base__u64__sat_add_indirect(&self->private_impl.f_compressed_wi,
+                                          v_n_compressed);
+        wuffs_base__u64__sat_sub_indirect(&v_block_size, v_n_compressed);
+        if (v_block_size > 0) {
+          goto label_1_break;
+        }
+        if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          v_need_block_size = true;
+          goto label_1_break;
+        }
+        v_block_size = ((uint64_t)(wuffs_base__load_u8be(iop_a_src)));
+        (iop_a_src += 1, wuffs_base__make_empty_struct());
+      }
+    label_1_break:;
+      if (1 > ((uint64_t)(a_workbuf.len))) {
+        status = wuffs_base__error__bad_workbuf_length;
+        goto exit;
+      }
+    label_2_continue:;
+      while (true) {
+        if ((self->private_impl.f_compressed_ri >
+             self->private_impl.f_compressed_wi) ||
+            (self->private_impl.f_compressed_wi > 4096)) {
+          status = wuffs_gif__error__internal_error_inconsistent_ri_wi;
+          goto exit;
+        }
+        {
+          wuffs_base__io_buffer* o_0_v_r = v_r;
+          uint8_t* o_0_iop_v_r = iop_v_r;
+          uint8_t* o_0_io0_v_r = io0_v_r;
+          uint8_t* o_0_io1_v_r = io1_v_r;
+          uint8_t* o_0_io2_v_r = io2_v_r;
+          v_r = wuffs_base__io_reader__set(
+              &u_r, &iop_v_r, &io0_v_r, &io1_v_r, &io2_v_r,
+              wuffs_base__slice_u8__subslice_ij(
+                  wuffs_base__make_slice_u8(self->private_data.f_compressed,
+                                            4096),
+                  self->private_impl.f_compressed_ri,
+                  self->private_impl.f_compressed_wi));
+          v_mark = ((uint64_t)(iop_v_r - io0_v_r));
+          {
+            u_r.meta.ri = ((size_t)(iop_v_r - u_r.data.ptr));
+            wuffs_base__status t_1 = wuffs_lzw__decoder__decode_io_writer(
+                &self->private_data.f_lzw, &empty_io_buffer, v_r,
+                wuffs_base__utility__empty_slice_u8());
+            iop_v_r = u_r.data.ptr + u_r.meta.ri;
+            v_lzw_status = t_1;
+          }
+          wuffs_base__u64__sat_add_indirect(
+              &self->private_impl.f_compressed_ri,
+              wuffs_base__io__count_since(v_mark,
+                                          ((uint64_t)(iop_v_r - io0_v_r))));
+          v_r = o_0_v_r;
+          iop_v_r = o_0_iop_v_r;
+          io0_v_r = o_0_io0_v_r;
+          io1_v_r = o_0_io1_v_r;
+          io2_v_r = o_0_io2_v_r;
+        }
+        v_uncompressed = wuffs_lzw__decoder__flush(&self->private_data.f_lzw);
+        if (((uint64_t)(v_uncompressed.len)) > 0) {
+          v_copy_status = wuffs_gif__decoder__copy_to_image_buffer(
+              self, a_dst, v_uncompressed);
+          if (wuffs_base__status__is_error(v_copy_status)) {
+            status = v_copy_status;
+            goto exit;
+          }
+        }
+        if (wuffs_base__status__is_ok(v_lzw_status)) {
+          self->private_impl.f_previous_lzw_decode_ended_abruptly = false;
+          if (v_need_block_size || (v_block_size > 0)) {
+            self->private_data.s_decode_id_part2[0].scratch =
+                ((uint32_t)(v_block_size));
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+            if (self->private_data.s_decode_id_part2[0].scratch >
+                ((uint64_t)(io2_a_src - iop_a_src))) {
+              self->private_data.s_decode_id_part2[0].scratch -=
+                  ((uint64_t)(io2_a_src - iop_a_src));
+              iop_a_src = io2_a_src;
+              status = wuffs_base__suspension__short_read;
+              goto suspend;
+            }
+            iop_a_src += self->private_data.s_decode_id_part2[0].scratch;
+            if (a_src) {
+              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+            }
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+            status = wuffs_gif__decoder__skip_blocks(self, a_src);
+            if (a_src) {
+              iop_a_src = a_src->data.ptr + a_src->meta.ri;
+            }
+            if (status) {
+              goto suspend;
+            }
+          }
+          goto label_0_break;
+        } else if (v_lzw_status == wuffs_base__suspension__short_read) {
+          goto label_0_continue;
+        } else if (v_lzw_status == wuffs_base__suspension__short_write) {
+          goto label_2_continue;
+        }
+        status = v_lzw_status;
+        if (wuffs_base__status__is_error(status)) {
+          goto exit;
+        } else if (wuffs_base__status__is_suspension(status)) {
+          status = wuffs_base__error__cannot_return_a_suspension;
+          goto exit;
+        }
+        goto ok;
+      }
+    }
+  label_0_break:;
+    self->private_impl.f_compressed_ri = 0;
+    self->private_impl.f_compressed_wi = 0;
+    if ((self->private_impl.f_dst_y < self->private_impl.f_frame_rect_y1) &&
+        (self->private_impl.f_frame_rect_x0 !=
+         self->private_impl.f_frame_rect_x1) &&
+        (self->private_impl.f_frame_rect_y0 !=
+         self->private_impl.f_frame_rect_y1)) {
+      status = wuffs_base__error__not_enough_data;
+      goto exit;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_id_part2[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_id_part2[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_data.s_decode_id_part2[0].v_block_size = v_block_size;
+  self->private_data.s_decode_id_part2[0].v_need_block_size = v_need_block_size;
+  self->private_data.s_decode_id_part2[0].v_lzw_status = v_lzw_status;
+
+  goto exit;
+exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.copy_to_image_buffer
+
+static wuffs_base__status  //
+wuffs_gif__decoder__copy_to_image_buffer(wuffs_gif__decoder* self,
+                                         wuffs_base__pixel_buffer* a_pb,
+                                         wuffs_base__slice_u8 a_src) {
+  wuffs_base__slice_u8 v_dst = {0};
+  wuffs_base__slice_u8 v_src = {0};
+  uint64_t v_width_in_bytes = 0;
+  uint64_t v_n = 0;
+  uint64_t v_src_ri = 0;
+  uint32_t v_bytes_per_pixel = 0;
+  uint32_t v_pixfmt_channels = 0;
+  wuffs_base__table_u8 v_tab = {0};
+  uint64_t v_i = 0;
+  uint64_t v_j = 0;
+  uint32_t v_replicate_y0 = 0;
+  uint32_t v_replicate_y1 = 0;
+  wuffs_base__slice_u8 v_replicate_dst = {0};
+  wuffs_base__slice_u8 v_replicate_src = {0};
+
+  v_pixfmt_channels = (wuffs_base__pixel_buffer__pixel_format(a_pb) & 65535);
+  if (v_pixfmt_channels == 34952) {
+    v_bytes_per_pixel = 4;
+  } else if (v_pixfmt_channels == 2184) {
+    v_bytes_per_pixel = 3;
+  } else if (v_pixfmt_channels == 8) {
+    v_bytes_per_pixel = 1;
+  } else {
+    return wuffs_base__error__unsupported_option;
+  }
+  v_width_in_bytes = (((uint64_t)(self->private_impl.f_width)) *
+                      ((uint64_t)(v_bytes_per_pixel)));
+  v_tab = wuffs_base__pixel_buffer__plane(a_pb, 0);
+label_0_continue:;
+  while (v_src_ri < ((uint64_t)(a_src.len))) {
+    v_src = wuffs_base__slice_u8__subslice_i(a_src, v_src_ri);
+    if (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1) {
+      if (self->private_impl.f_quirk_enabled_ignore_too_much_pixel_data) {
+        return NULL;
+      }
+      return wuffs_base__error__too_much_data;
+    }
+    v_dst = wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
+    if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
+      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, 0);
+    } else if (v_width_in_bytes < ((uint64_t)(v_dst.len))) {
+      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_width_in_bytes);
+    }
+    v_i = (((uint64_t)(self->private_impl.f_dst_x)) *
+           ((uint64_t)(v_bytes_per_pixel)));
+    if (v_i < ((uint64_t)(v_dst.len))) {
+      v_j = (((uint64_t)(self->private_impl.f_frame_rect_x1)) *
+             ((uint64_t)(v_bytes_per_pixel)));
+      if ((v_i <= v_j) && (v_j <= ((uint64_t)(v_dst.len)))) {
+        v_dst = wuffs_base__slice_u8__subslice_ij(v_dst, v_i, v_j);
+      } else {
+        v_dst = wuffs_base__slice_u8__subslice_i(v_dst, v_i);
+      }
+      v_n = wuffs_base__pixel_swizzler__swizzle_interleaved(
+          &self->private_impl.f_swizzler, v_dst,
+          wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024),
+          v_src);
+      wuffs_base__u64__sat_add_indirect(&v_src_ri, v_n);
+      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x,
+                                        ((uint32_t)((v_n & 4294967295))));
+      self->private_impl.f_dirty_max_excl_y = wuffs_base__u32__max(
+          self->private_impl.f_dirty_max_excl_y,
+          wuffs_base__u32__sat_add(self->private_impl.f_dst_y, 1));
+    }
+    if (self->private_impl.f_frame_rect_x1 <= self->private_impl.f_dst_x) {
+      self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
+      if (self->private_impl.f_interlace == 0) {
+        wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_y, 1);
+        goto label_0_continue;
+      }
+      if ((self->private_impl.f_num_decoded_frames_value == 0) &&
+          !self->private_impl.f_gc_has_transparent_index &&
+          (self->private_impl.f_interlace > 1)) {
+        v_replicate_src =
+            wuffs_base__table_u8__row(v_tab, self->private_impl.f_dst_y);
+        v_replicate_y0 =
+            wuffs_base__u32__sat_add(self->private_impl.f_dst_y, 1);
+        v_replicate_y1 = wuffs_base__u32__sat_add(
+            self->private_impl.f_dst_y,
+            ((uint32_t)(
+                wuffs_gif__interlace_count[self->private_impl.f_interlace])));
+        v_replicate_y1 = wuffs_base__u32__min(
+            v_replicate_y1, self->private_impl.f_frame_rect_y1);
+        while (v_replicate_y0 < v_replicate_y1) {
+          v_replicate_dst = wuffs_base__table_u8__row(v_tab, v_replicate_y0);
+          wuffs_base__slice_u8__copy_from_slice(v_replicate_dst,
+                                                v_replicate_src);
+          v_replicate_y0 += 1;
+        }
+        self->private_impl.f_dirty_max_excl_y = wuffs_base__u32__max(
+            self->private_impl.f_dirty_max_excl_y, v_replicate_y1);
+      }
+      wuffs_base__u32__sat_add_indirect(
+          &self->private_impl.f_dst_y,
+          ((uint32_t)(
+              wuffs_gif__interlace_delta[self->private_impl.f_interlace])));
+      while (
+          (self->private_impl.f_interlace > 0) &&
+          (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1)) {
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+        self->private_impl.f_interlace -= 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+        self->private_impl.f_dst_y = wuffs_base__u32__sat_add(
+            self->private_impl.f_frame_rect_y0,
+            wuffs_gif__interlace_start[self->private_impl.f_interlace]);
+      }
+      goto label_0_continue;
+    }
+    if (((uint64_t)(a_src.len)) == v_src_ri) {
+      goto label_0_break;
+    } else if (((uint64_t)(a_src.len)) < v_src_ri) {
+      return wuffs_gif__error__internal_error_inconsistent_ri_wi;
+    }
+    v_n = ((uint64_t)(
+        (self->private_impl.f_frame_rect_x1 - self->private_impl.f_dst_x)));
+    v_n = wuffs_base__u64__min(v_n, (((uint64_t)(a_src.len)) - v_src_ri));
+    wuffs_base__u64__sat_add_indirect(&v_src_ri, v_n);
+    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x,
+                                      ((uint32_t)((v_n & 4294967295))));
+    if (self->private_impl.f_frame_rect_x1 <= self->private_impl.f_dst_x) {
+      self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
+      wuffs_base__u32__sat_add_indirect(
+          &self->private_impl.f_dst_y,
+          ((uint32_t)(
+              wuffs_gif__interlace_delta[self->private_impl.f_interlace])));
+      while (
+          (self->private_impl.f_interlace > 0) &&
+          (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1)) {
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+        self->private_impl.f_interlace -= 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+        self->private_impl.f_dst_y = wuffs_base__u32__sat_add(
+            self->private_impl.f_frame_rect_y0,
+            wuffs_gif__interlace_start[self->private_impl.f_interlace]);
+      }
+      goto label_0_continue;
+    }
+    if (v_src_ri != ((uint64_t)(a_src.len))) {
+      return wuffs_gif__error__internal_error_inconsistent_ri_wi;
+    }
+    goto label_0_break;
+  }
+label_0_break:;
+  return NULL;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GIF)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GZIP)
+
+// ---------------- Status Codes Implementations
+
+const char* wuffs_gzip__error__bad_checksum = "#gzip: bad checksum";
+const char* wuffs_gzip__error__bad_compression_method =
+    "#gzip: bad compression method";
+const char* wuffs_gzip__error__bad_encoding_flags = "#gzip: bad encoding flags";
+const char* wuffs_gzip__error__bad_header = "#gzip: bad header";
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_gzip__decoder__initialize(wuffs_gzip__decoder* self,
+                                size_t sizeof_star_self,
+                                uint64_t wuffs_version,
+                                uint32_t initialize_flags) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__error__bad_wuffs_version;
+  }
+
+  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+// The whole point of this if-check is to detect an uninitialized *self.
+// We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((initialize_flags &
+         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  {
+    wuffs_base__status z = wuffs_crc32__ieee_hasher__initialize(
+        &self->private_data.f_checksum, sizeof(self->private_data.f_checksum),
+        WUFFS_VERSION, initialize_flags);
+    if (z) {
+      return z;
+    }
+  }
+  {
+    wuffs_base__status z = wuffs_deflate__decoder__initialize(
+        &self->private_data.f_flate, sizeof(self->private_data.f_flate),
+        WUFFS_VERSION, initialize_flags);
+    if (z) {
+      return z;
+    }
+  }
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_gzip__decoder() {
+  return sizeof(wuffs_gzip__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func gzip.decoder.set_ignore_checksum
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_gzip__decoder__set_ignore_checksum(wuffs_gzip__decoder* self, bool a_ic) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  self->private_impl.f_ignore_checksum = a_ic;
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func gzip.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
+wuffs_gzip__decoder__workbuf_len(const wuffs_gzip__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- func gzip.decoder.decode_io_writer
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_gzip__decoder__decode_io_writer(wuffs_gzip__decoder* self,
+                                      wuffs_base__io_buffer* a_dst,
+                                      wuffs_base__io_buffer* a_src,
+                                      wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
+               ? wuffs_base__error__disabled_by_previous_error
+               : wuffs_base__error__initialize_not_called;
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__bad_argument;
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint8_t v_c = 0;
+  uint8_t v_flags = 0;
+  uint16_t v_xlen = 0;
+  uint64_t v_mark = 0;
+  uint32_t v_checksum_got = 0;
+  uint32_t v_decoded_length_got = 0;
+  wuffs_base__status v_status = NULL;
+  uint32_t v_checksum_want = 0;
+  uint32_t v_decoded_length_want = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_io_writer[0];
+  if (coro_susp_point) {
+    v_flags = self->private_data.s_decode_io_writer[0].v_flags;
+    v_checksum_got = self->private_data.s_decode_io_writer[0].v_checksum_got;
+    v_decoded_length_got =
+        self->private_data.s_decode_io_writer[0].v_decoded_length_got;
+    v_checksum_want = self->private_data.s_decode_io_writer[0].v_checksum_want;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_c = t_0;
+    }
+    if (v_c != 31) {
+      status = wuffs_gzip__error__bad_header;
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_1 = *iop_a_src++;
+      v_c = t_1;
+    }
+    if (v_c != 139) {
+      status = wuffs_gzip__error__bad_header;
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_2 = *iop_a_src++;
+      v_c = t_2;
+    }
+    if (v_c != 8) {
+      status = wuffs_gzip__error__bad_compression_method;
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      uint8_t t_3 = *iop_a_src++;
+      v_flags = t_3;
+    }
+    self->private_data.s_decode_io_writer[0].scratch = 6;
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+    if (self->private_data.s_decode_io_writer[0].scratch >
+        ((uint64_t)(io2_a_src - iop_a_src))) {
+      self->private_data.s_decode_io_writer[0].scratch -=
+          ((uint64_t)(io2_a_src - iop_a_src));
+      iop_a_src = io2_a_src;
+      status = wuffs_base__suspension__short_read;
+      goto suspend;
+    }
+    iop_a_src += self->private_data.s_decode_io_writer[0].scratch;
+    if ((v_flags & 4) != 0) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+        uint16_t t_4;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_4 = wuffs_base__load_u16le(iop_a_src);
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_io_writer[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__suspension__short_read;
+              goto suspend;
+            }
+            uint64_t* scratch =
+                &self->private_data.s_decode_io_writer[0].scratch;
+            uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
+            if (num_bits_4 == 8) {
+              t_4 = ((uint16_t)(*scratch));
+              break;
+            }
+            num_bits_4 += 8;
+            *scratch |= ((uint64_t)(num_bits_4)) << 56;
+          }
+        }
+        v_xlen = t_4;
+      }
+      self->private_data.s_decode_io_writer[0].scratch = ((uint32_t)(v_xlen));
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+      if (self->private_data.s_decode_io_writer[0].scratch >
+          ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_decode_io_writer[0].scratch -=
+            ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_decode_io_writer[0].scratch;
+    }
+    if ((v_flags & 8) != 0) {
+      while (true) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint8_t t_5 = *iop_a_src++;
+          v_c = t_5;
+        }
+        if (v_c == 0) {
+          goto label_0_break;
+        }
+      }
+    label_0_break:;
+    }
+    if ((v_flags & 16) != 0) {
+      while (true) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint8_t t_6 = *iop_a_src++;
+          v_c = t_6;
+        }
+        if (v_c == 0) {
+          goto label_1_break;
+        }
+      }
+    label_1_break:;
+    }
+    if ((v_flags & 2) != 0) {
+      self->private_data.s_decode_io_writer[0].scratch = 2;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
+      if (self->private_data.s_decode_io_writer[0].scratch >
+          ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_decode_io_writer[0].scratch -=
+            ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__suspension__short_read;
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_decode_io_writer[0].scratch;
+    }
+    if ((v_flags & 224) != 0) {
+      status = wuffs_gzip__error__bad_encoding_flags;
+      goto exit;
+    }
+    while (true) {
+      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
+      {
+        if (a_dst) {
+          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        wuffs_base__status t_7 = wuffs_deflate__decoder__decode_io_writer(
+            &self->private_data.f_flate, a_dst, a_src, a_workbuf);
+        if (a_dst) {
+          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+        }
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        v_status = t_7;
+      }
+      if (!self->private_impl.f_ignore_checksum) {
+        v_checksum_got = wuffs_crc32__ieee_hasher__update_u32(
+            &self->private_data.f_checksum,
+            wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)),
+                                  io0_a_dst));
+        v_decoded_length_got +=
+            ((uint32_t)((wuffs_base__io__count_since(
+                             v_mark, ((uint64_t)(iop_a_dst - io0_a_dst))) &
+                         4294967295)));
+      }
+      if (wuffs_base__status__is_ok(v_status)) {
+        goto label_2_break;
+      }
+      status = v_status;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(12);
+    }
+  label_2_break:;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(13);
+      uint32_t t_8;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_8 = wuffs_base__load_u32le(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_io_writer[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_io_writer[0].scratch;
+          uint32_t num_bits_8 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_8;
+          if (num_bits_8 == 24) {
+            t_8 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_8 += 8;
+          *scratch |= ((uint64_t)(num_bits_8)) << 56;
+        }
+      }
+      v_checksum_want = t_8;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(15);
+      uint32_t t_9;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_9 = wuffs_base__load_u32le(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_io_writer[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_io_writer[0].scratch;
+          uint32_t num_bits_9 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_9;
+          if (num_bits_9 == 24) {
+            t_9 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_9 += 8;
+          *scratch |= ((uint64_t)(num_bits_9)) << 56;
+        }
+      }
+      v_decoded_length_want = t_9;
+    }
+    if (!self->private_impl.f_ignore_checksum &&
+        ((v_checksum_got != v_checksum_want) ||
+         (v_decoded_length_got != v_decoded_length_want))) {
+      status = wuffs_gzip__error__bad_checksum;
+      goto exit;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_io_writer[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_io_writer[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine =
+      wuffs_base__status__is_suspension(status) ? 1 : 0;
+  self->private_data.s_decode_io_writer[0].v_flags = v_flags;
+  self->private_data.s_decode_io_writer[0].v_checksum_got = v_checksum_got;
+  self->private_data.s_decode_io_writer[0].v_decoded_length_got =
+      v_decoded_length_got;
+  self->private_data.s_decode_io_writer[0].v_checksum_want = v_checksum_want;
+
+  goto exit;
+exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__GZIP)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ZLIB)
+
+// ---------------- Status Codes Implementations
+
+const char* wuffs_zlib__warning__dictionary_required =
+    "@zlib: dictionary required";
+const char* wuffs_zlib__error__bad_checksum = "#zlib: bad checksum";
+const char* wuffs_zlib__error__bad_compression_method =
+    "#zlib: bad compression method";
+const char* wuffs_zlib__error__bad_compression_window_size =
+    "#zlib: bad compression window size";
+const char* wuffs_zlib__error__bad_parity_check = "#zlib: bad parity check";
+const char* wuffs_zlib__error__incorrect_dictionary =
+    "#zlib: incorrect dictionary";
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT  //
+wuffs_zlib__decoder__initialize(wuffs_zlib__decoder* self,
+                                size_t sizeof_star_self,
+                                uint64_t wuffs_version,
+                                uint32_t initialize_flags) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__error__bad_sizeof_receiver;
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__error__bad_wuffs_version;
+  }
+
+  if ((initialize_flags & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+// The whole point of this if-check is to detect an uninitialized *self.
+// We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__error__initialize_falsely_claimed_already_zeroed;
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((initialize_flags &
+         WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      initialize_flags |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  {
+    wuffs_base__status z = wuffs_adler32__hasher__initialize(
+        &self->private_data.f_checksum, sizeof(self->private_data.f_checksum),
+        WUFFS_VERSION, initialize_flags);
+    if (z) {
+      return z;
+    }
+  }
+  {
+    wuffs_base__status z = wuffs_adler32__hasher__initialize(
+        &self->private_data.f_dict_id_hasher,
+        sizeof(self->private_data.f_dict_id_hasher), WUFFS_VERSION,
+        initialize_flags);
+    if (z) {
+      return z;
+    }
+  }
+  {
+    wuffs_base__status z = wuffs_deflate__decoder__initialize(
+        &self->private_data.f_flate, sizeof(self->private_data.f_flate),
+        WUFFS_VERSION, initialize_flags);
+    if (z) {
+      return z;
+    }
+  }
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  return NULL;
+}
+
+size_t  //
+sizeof__wuffs_zlib__decoder() {
+  return sizeof(wuffs_zlib__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func zlib.decoder.dictionary_id
+
+WUFFS_BASE__MAYBE_STATIC uint32_t  //
+wuffs_zlib__decoder__dictionary_id(const wuffs_zlib__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return self->private_impl.f_dict_id_want;
+}
+
+// -------- func zlib.decoder.add_dictionary
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_zlib__decoder__add_dictionary(wuffs_zlib__decoder* self,
+                                    wuffs_base__slice_u8 a_dict) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (self->private_impl.f_header_complete) {
+    self->private_impl.f_bad_call_sequence = true;
+  } else {
+    self->private_impl.f_dict_id_got = wuffs_adler32__hasher__update_u32(
+        &self->private_data.f_dict_id_hasher, a_dict);
+    wuffs_deflate__decoder__add_history(&self->private_data.f_flate, a_dict);
+  }
+  self->private_impl.f_got_dictionary = true;
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func zlib.decoder.set_ignore_checksum
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct  //
+wuffs_zlib__decoder__set_ignore_checksum(wuffs_zlib__decoder* self, bool a_ic) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  self->private_impl.f_ignore_checksum = a_ic;
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func zlib.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64  //
+wuffs_zlib__decoder__workbuf_len(const wuffs_zlib__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__make_range_ii_u64(0, 0);
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- func zlib.decoder.decode_io_writer
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_zlib__decoder__decode_io_writer(wuffs_zlib__decoder* self,
+                                      wuffs_base__io_buffer* a_dst,
+                                      wuffs_base__io_buffer* a_src,
+                                      wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__error__bad_receiver;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return (self->private_impl.magic == WUFFS_BASE__DISABLED)
+               ? wuffs_base__error__disabled_by_previous_error
+               : wuffs_base__error__initialize_not_called;
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__bad_argument;
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__error__interleaved_coroutine_calls;
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = NULL;
+
+  uint16_t v_x = 0;
+  uint32_t v_checksum_got = 0;
+  wuffs_base__status v_status = NULL;
+  uint32_t v_checksum_want = 0;
+  uint64_t v_mark = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  uint8_t* iop_a_src = NULL;
+  uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_io_writer[0];
+  if (coro_susp_point) {
+    v_checksum_got = self->private_data.s_decode_io_writer[0].v_checksum_got;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_bad_call_sequence) {
+      status = wuffs_base__error__bad_call_sequence;
+      goto exit;
+    } else if (!self->private_impl.f_want_dictionary) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        uint16_t t_0;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_0 = wuffs_base__load_u16be(iop_a_src);
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_io_writer[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__suspension__short_read;
+              goto suspend;
+            }
+            uint64_t* scratch =
+                &self->private_data.s_decode_io_writer[0].scratch;
+            uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+            *scratch >>= 8;
+            *scratch <<= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+            if (num_bits_0 == 8) {
+              t_0 = ((uint16_t)(*scratch >> 48));
+              break;
+            }
+            num_bits_0 += 8;
+            *scratch |= ((uint64_t)(num_bits_0));
+          }
+        }
+        v_x = t_0;
+      }
+      if (((v_x >> 8) & 15) != 8) {
+        status = wuffs_zlib__error__bad_compression_method;
+        goto exit;
+      }
+      if ((v_x >> 12) > 7) {
+        status = wuffs_zlib__error__bad_compression_window_size;
+        goto exit;
+      }
+      if ((v_x % 31) != 0) {
+        status = wuffs_zlib__error__bad_parity_check;
+        goto exit;
+      }
+      self->private_impl.f_want_dictionary = ((v_x & 32) != 0);
+      if (self->private_impl.f_want_dictionary) {
+        self->private_impl.f_dict_id_got = 1;
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          uint32_t t_1;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_1 = wuffs_base__load_u32be(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_decode_io_writer[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__suspension__short_read;
+                goto suspend;
+              }
+              uint64_t* scratch =
+                  &self->private_data.s_decode_io_writer[0].scratch;
+              uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
+              if (num_bits_1 == 24) {
+                t_1 = ((uint32_t)(*scratch >> 32));
+                break;
+              }
+              num_bits_1 += 8;
+              *scratch |= ((uint64_t)(num_bits_1));
+            }
+          }
+          self->private_impl.f_dict_id_want = t_1;
+        }
+        status = wuffs_zlib__warning__dictionary_required;
+        goto ok;
+      } else if (self->private_impl.f_got_dictionary) {
+        status = wuffs_zlib__error__incorrect_dictionary;
+        goto exit;
+      }
+    } else if (self->private_impl.f_dict_id_got !=
+               self->private_impl.f_dict_id_want) {
+      if (self->private_impl.f_got_dictionary) {
+        status = wuffs_zlib__error__incorrect_dictionary;
+        goto exit;
+      }
+      status = wuffs_zlib__warning__dictionary_required;
+      goto ok;
+    }
+    self->private_impl.f_header_complete = true;
+    while (true) {
+      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
+      {
+        if (a_dst) {
+          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        wuffs_base__status t_2 = wuffs_deflate__decoder__decode_io_writer(
+            &self->private_data.f_flate, a_dst, a_src, a_workbuf);
+        if (a_dst) {
+          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+        }
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        v_status = t_2;
+      }
+      if (!self->private_impl.f_ignore_checksum) {
+        v_checksum_got = wuffs_adler32__hasher__update_u32(
+            &self->private_data.f_checksum,
+            wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)),
+                                  io0_a_dst));
+      }
+      if (wuffs_base__status__is_ok(v_status)) {
+        goto label_0_break;
+      }
+      status = v_status;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
+    }
+  label_0_break:;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+      uint32_t t_3;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_3 = wuffs_base__load_u32be(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_io_writer[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__suspension__short_read;
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_io_writer[0].scratch;
+          uint32_t num_bits_3 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
+          if (num_bits_3 == 24) {
+            t_3 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_3 += 8;
+          *scratch |= ((uint64_t)(num_bits_3));
+        }
+      }
+      v_checksum_want = t_3;
+    }
+    if (!self->private_impl.f_ignore_checksum &&
+        (v_checksum_got != v_checksum_want)) {
+      status = wuffs_zlib__error__bad_checksum;
+      goto exit;
+    }
+
+    goto ok;
+  ok:
+    self->private_impl.p_decode_io_writer[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+suspend:
+  self->private_impl.p_decode_io_writer[0] =
+      wuffs_base__status__is_suspension(status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine =
+      wuffs_base__status__is_suspension(status) ? 1 : 0;
+  self->private_data.s_decode_io_writer[0].v_checksum_got = v_checksum_got;
+
+  goto exit;
+exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__ZLIB)
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#endif  // WUFFS_INCLUDE_GUARD
diff --git a/release/c/wuffs-v0.3.c b/release/c/wuffs-v0.3.c
new file mode 100644
index 0000000..91181f8
--- /dev/null
+++ b/release/c/wuffs-v0.3.c
@@ -0,0 +1,43896 @@
+#ifndef WUFFS_INCLUDE_GUARD
+#define WUFFS_INCLUDE_GUARD
+
+// Wuffs ships as a "single file C library" or "header file library" as per
+// https://github.com/nothings/stb/blob/master/docs/stb_howto.txt
+//
+// To use that single file as a "foo.c"-like implementation, instead of a
+// "foo.h"-like header, #define WUFFS_IMPLEMENTATION before #include'ing or
+// compiling it.
+
+// Wuffs' C code is generated automatically, not hand-written. These warnings'
+// costs outweigh the benefits.
+//
+// The "elif defined(__clang__)" isn't redundant. While vanilla clang defines
+// __GNUC__, clang-cl (which mimics MSVC's cl.exe) does not.
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
+#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
+#pragma GCC diagnostic ignored "-Wunreachable-code"
+#pragma GCC diagnostic ignored "-Wunused-function"
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#if defined(__cplusplus)
+#pragma GCC diagnostic ignored "-Wold-style-cast"
+#endif
+#elif defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wimplicit-fallthrough"
+#pragma clang diagnostic ignored "-Wmissing-field-initializers"
+#pragma clang diagnostic ignored "-Wunreachable-code"
+#pragma clang diagnostic ignored "-Wunused-function"
+#pragma clang diagnostic ignored "-Wunused-parameter"
+#if defined(__cplusplus)
+#pragma clang diagnostic ignored "-Wold-style-cast"
+#endif
+#endif
+
+// Copyright 2017 The Wuffs Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef __cplusplus
+#if (__cplusplus >= 201103L) || defined(_MSC_VER)
+#include <memory>
+#define WUFFS_BASE__HAVE_EQ_DELETE
+#define WUFFS_BASE__HAVE_UNIQUE_PTR
+// The "defined(__clang__)" isn't redundant. While vanilla clang defines
+// __GNUC__, clang-cl (which mimics MSVC's cl.exe) does not.
+#elif defined(__GNUC__) || defined(__clang__)
+#warning "Wuffs' C++ code expects -std=c++11 or later"
+#endif
+
+extern "C" {
+#endif
+
+// ---------------- Version
+
+// WUFFS_VERSION is the major.minor.patch version, as per https://semver.org/,
+// as a uint64_t. The major number is the high 32 bits. The minor number is the
+// middle 16 bits. The patch number is the low 16 bits. The pre-release label
+// and build metadata are part of the string representation (such as
+// "1.2.3-beta+456.20181231") but not the uint64_t representation.
+//
+// WUFFS_VERSION_PRE_RELEASE_LABEL (such as "", "beta" or "rc.1") being
+// non-empty denotes a developer preview, not a release version, and has no
+// backwards or forwards compatibility guarantees.
+//
+// WUFFS_VERSION_BUILD_METADATA_XXX, if non-zero, are the number of commits and
+// the last commit date in the repository used to build this library. Within
+// each major.minor branch, the commit count should increase monotonically.
+//
+// WUFFS_VERSION was overridden by "wuffs gen -version" based on revision
+// 161e4730d8b446a72d6152b8343da8543e7518bf committed on 2021-11-18.
+#define WUFFS_VERSION 0x000030000
+#define WUFFS_VERSION_MAJOR 0
+#define WUFFS_VERSION_MINOR 3
+#define WUFFS_VERSION_PATCH 0
+#define WUFFS_VERSION_PRE_RELEASE_LABEL "beta.11"
+#define WUFFS_VERSION_BUILD_METADATA_COMMIT_COUNT 3198
+#define WUFFS_VERSION_BUILD_METADATA_COMMIT_DATE 20211118
+#define WUFFS_VERSION_STRING "0.3.0-beta.11+3198.20211118"
+
+// ---------------- Configuration
+
+// Define WUFFS_CONFIG__AVOID_CPU_ARCH to avoid any code tied to a specific CPU
+// architecture, such as SSE SIMD for the x86 CPU family.
+#if defined(WUFFS_CONFIG__AVOID_CPU_ARCH)  // (#if-chain ref AVOID_CPU_ARCH_0)
+// No-op.
+#else  // (#if-chain ref AVOID_CPU_ARCH_0)
+
+// The "defined(__clang__)" isn't redundant. While vanilla clang defines
+// __GNUC__, clang-cl (which mimics MSVC's cl.exe) does not.
+#if defined(__GNUC__) || defined(__clang__)
+#define WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET(arg) __attribute__((target(arg)))
+#else
+#define WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET(arg)
+#endif  // defined(__GNUC__) || defined(__clang__)
+
+#if defined(__GNUC__)  // (#if-chain ref AVOID_CPU_ARCH_1)
+
+// To simplify Wuffs code, "cpu_arch >= arm_xxx" requires xxx but also
+// unaligned little-endian load/stores.
+#if defined(__ARM_FEATURE_UNALIGNED) && !defined(__native_client__) && \
+    defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+// Not all gcc versions define __ARM_ACLE, even if they support crc32
+// intrinsics. Look for __ARM_FEATURE_CRC32 instead.
+#if defined(__ARM_FEATURE_CRC32)
+#include <arm_acle.h>
+#define WUFFS_BASE__CPU_ARCH__ARM_CRC32
+#endif  // defined(__ARM_FEATURE_CRC32)
+#if defined(__ARM_NEON)
+#include <arm_neon.h>
+#define WUFFS_BASE__CPU_ARCH__ARM_NEON
+#endif  // defined(__ARM_NEON)
+#endif  // defined(__ARM_FEATURE_UNALIGNED) etc
+
+// Similarly, "cpu_arch >= x86_sse42" requires SSE4.2 but also PCLMUL and
+// POPCNT. This is checked at runtime via cpuid, not at compile time.
+//
+// Likewise, "cpu_arch >= x86_avx2" also requires PCLMUL, POPCNT and SSE4.2.
+#if defined(__i386__) || defined(__x86_64__)
+#if !defined(__native_client__)
+#include <cpuid.h>
+#include <x86intrin.h>
+// X86_FAMILY means X86 (32-bit) or X86_64 (64-bit, obviously).
+#define WUFFS_BASE__CPU_ARCH__X86_FAMILY
+#endif  // !defined(__native_client__)
+#endif  // defined(__i386__) || defined(__x86_64__)
+
+#elif defined(_MSC_VER)  // (#if-chain ref AVOID_CPU_ARCH_1)
+
+#if defined(_M_IX86) || defined(_M_X64)
+#if defined(__AVX__) || defined(__clang__)
+
+// We need <intrin.h> for the __cpuid function.
+#include <intrin.h>
+// That's not enough for X64 SIMD, with clang-cl, if we want to use
+// "__attribute__((target(arg)))" without e.g. "/arch:AVX".
+//
+// Some web pages suggest that <immintrin.h> is all you need, as it pulls in
+// the earlier SIMD families like SSE4.2, but that doesn't seem to work in
+// practice, possibly for the same reason that just <intrin.h> doesn't work.
+#include <immintrin.h>  // AVX, AVX2, FMA, POPCNT
+#include <nmmintrin.h>  // SSE4.2
+#include <wmmintrin.h>  // AES, PCLMUL
+// X86_FAMILY means X86 (32-bit) or X86_64 (64-bit, obviously).
+#define WUFFS_BASE__CPU_ARCH__X86_FAMILY
+
+#else  // defined(__AVX__) || defined(__clang__)
+
+// clang-cl (which defines both __clang__ and _MSC_VER) supports
+// "__attribute__((target(arg)))".
+//
+// For MSVC's cl.exe (unlike clang or gcc), SIMD capability is a compile-time
+// property of the source file (e.g. a /arch:AVX or -mavx compiler flag), not
+// of individual functions (that can be conditionally selected at runtime).
+#pragma message("Wuffs with MSVC+IX86/X64 needs /arch:AVX for best performance")
+
+#endif  // defined(__AVX__) || defined(__clang__)
+#endif  // defined(_M_IX86) || defined(_M_X64)
+
+#endif  // (#if-chain ref AVOID_CPU_ARCH_1)
+#endif  // (#if-chain ref AVOID_CPU_ARCH_0)
+
+// --------
+
+// Define WUFFS_CONFIG__STATIC_FUNCTIONS (combined with WUFFS_IMPLEMENTATION)
+// to make all of Wuffs' functions have static storage.
+//
+// This can help the compiler ignore or discard unused code, which can produce
+// faster compiles and smaller binaries. Other motivations are discussed in the
+// "ALLOW STATIC IMPLEMENTATION" section of
+// https://raw.githubusercontent.com/nothings/stb/master/docs/stb_howto.txt
+#if defined(WUFFS_CONFIG__STATIC_FUNCTIONS)
+#define WUFFS_BASE__MAYBE_STATIC static
+#else
+#define WUFFS_BASE__MAYBE_STATIC
+#endif  // defined(WUFFS_CONFIG__STATIC_FUNCTIONS)
+
+// ---------------- CPU Architecture
+
+static inline bool  //
+wuffs_base__cpu_arch__have_arm_crc32() {
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
+  return true;
+#else
+  return false;
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
+}
+
+static inline bool  //
+wuffs_base__cpu_arch__have_arm_neon() {
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+  return true;
+#else
+  return false;
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+}
+
+static inline bool  //
+wuffs_base__cpu_arch__have_x86_avx2() {
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+  // GCC defines these macros but MSVC does not.
+  //  - bit_AVX2 = (1 <<  5)
+  const unsigned int avx2_ebx7 = 0x00000020;
+  // GCC defines these macros but MSVC does not.
+  //  - bit_PCLMUL = (1 <<  1)
+  //  - bit_POPCNT = (1 << 23)
+  //  - bit_SSE4_2 = (1 << 20)
+  const unsigned int avx2_ecx1 = 0x00900002;
+
+  // clang defines __GNUC__ and clang-cl defines _MSC_VER (but not __GNUC__).
+#if defined(__GNUC__)
+  unsigned int eax7 = 0;
+  unsigned int ebx7 = 0;
+  unsigned int ecx7 = 0;
+  unsigned int edx7 = 0;
+  if (__get_cpuid_count(7, 0, &eax7, &ebx7, &ecx7, &edx7) &&
+      ((ebx7 & avx2_ebx7) == avx2_ebx7)) {
+    unsigned int eax1 = 0;
+    unsigned int ebx1 = 0;
+    unsigned int ecx1 = 0;
+    unsigned int edx1 = 0;
+    if (__get_cpuid(1, &eax1, &ebx1, &ecx1, &edx1) &&
+        ((ecx1 & avx2_ecx1) == avx2_ecx1)) {
+      return true;
+    }
+  }
+#elif defined(_MSC_VER)  // defined(__GNUC__)
+  int x7[4];
+  __cpuidex(x7, 7, 0);
+  if ((((unsigned int)(x7[1])) & avx2_ebx7) == avx2_ebx7) {
+    int x1[4];
+    __cpuid(x1, 1);
+    if ((((unsigned int)(x1[2])) & avx2_ecx1) == avx2_ecx1) {
+      return true;
+    }
+  }
+#else
+#error "WUFFS_BASE__CPU_ARCH__ETC combined with an unsupported compiler"
+#endif  // defined(__GNUC__); defined(_MSC_VER)
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+  return false;
+}
+
+static inline bool  //
+wuffs_base__cpu_arch__have_x86_bmi2() {
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+  // GCC defines these macros but MSVC does not.
+  //  - bit_BMI2 = (1 <<  8)
+  const unsigned int bmi2_ebx7 = 0x00000100;
+
+  // clang defines __GNUC__ and clang-cl defines _MSC_VER (but not __GNUC__).
+#if defined(__GNUC__)
+  unsigned int eax7 = 0;
+  unsigned int ebx7 = 0;
+  unsigned int ecx7 = 0;
+  unsigned int edx7 = 0;
+  if (__get_cpuid_count(7, 0, &eax7, &ebx7, &ecx7, &edx7) &&
+      ((ebx7 & bmi2_ebx7) == bmi2_ebx7)) {
+    return true;
+  }
+#elif defined(_MSC_VER)  // defined(__GNUC__)
+  int x7[4];
+  __cpuidex(x7, 7, 0);
+  if ((((unsigned int)(x7[1])) & bmi2_ebx7) == bmi2_ebx7) {
+    return true;
+  }
+#else
+#error "WUFFS_BASE__CPU_ARCH__ETC combined with an unsupported compiler"
+#endif  // defined(__GNUC__); defined(_MSC_VER)
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+  return false;
+}
+
+static inline bool  //
+wuffs_base__cpu_arch__have_x86_sse42() {
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+  // GCC defines these macros but MSVC does not.
+  //  - bit_PCLMUL = (1 <<  1)
+  //  - bit_POPCNT = (1 << 23)
+  //  - bit_SSE4_2 = (1 << 20)
+  const unsigned int sse42_ecx1 = 0x00900002;
+
+  // clang defines __GNUC__ and clang-cl defines _MSC_VER (but not __GNUC__).
+#if defined(__GNUC__)
+  unsigned int eax1 = 0;
+  unsigned int ebx1 = 0;
+  unsigned int ecx1 = 0;
+  unsigned int edx1 = 0;
+  if (__get_cpuid(1, &eax1, &ebx1, &ecx1, &edx1) &&
+      ((ecx1 & sse42_ecx1) == sse42_ecx1)) {
+    return true;
+  }
+#elif defined(_MSC_VER)  // defined(__GNUC__)
+  int x1[4];
+  __cpuid(x1, 1);
+  if ((((unsigned int)(x1[2])) & sse42_ecx1) == sse42_ecx1) {
+    return true;
+  }
+#else
+#error "WUFFS_BASE__CPU_ARCH__ETC combined with an unsupported compiler"
+#endif  // defined(__GNUC__); defined(_MSC_VER)
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+  return false;
+}
+
+// ---------------- Fundamentals
+
+// Wuffs assumes that:
+//  - converting a uint32_t to a size_t will never overflow.
+//  - converting a size_t to a uint64_t will never overflow.
+#if defined(__WORDSIZE)
+#if (__WORDSIZE != 32) && (__WORDSIZE != 64)
+#error "Wuffs requires a word size of either 32 or 64 bits"
+#endif
+#endif
+
+// The "defined(__clang__)" isn't redundant. While vanilla clang defines
+// __GNUC__, clang-cl (which mimics MSVC's cl.exe) does not.
+#if defined(__GNUC__) || defined(__clang__)
+#define WUFFS_BASE__POTENTIALLY_UNUSED __attribute__((unused))
+#define WUFFS_BASE__WARN_UNUSED_RESULT __attribute__((warn_unused_result))
+#else
+#define WUFFS_BASE__POTENTIALLY_UNUSED
+#define WUFFS_BASE__WARN_UNUSED_RESULT
+#endif
+
+// --------
+
+// Options (bitwise or'ed together) for wuffs_foo__bar__initialize functions.
+
+#define WUFFS_INITIALIZE__DEFAULT_OPTIONS ((uint32_t)0x00000000)
+
+// WUFFS_INITIALIZE__ALREADY_ZEROED means that the "self" receiver struct value
+// has already been set to all zeroes.
+#define WUFFS_INITIALIZE__ALREADY_ZEROED ((uint32_t)0x00000001)
+
+// WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED means that, absent
+// WUFFS_INITIALIZE__ALREADY_ZEROED, only some of the "self" receiver struct
+// value will be set to all zeroes. Internal buffers, which tend to be a large
+// proportion of the struct's size, will be left uninitialized. Internal means
+// that the buffer is contained by the receiver struct, as opposed to being
+// passed as a separately allocated "work buffer".
+//
+// For more detail, see:
+// https://github.com/google/wuffs/blob/main/doc/note/initialization.md
+#define WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED \
+  ((uint32_t)0x00000002)
+
+// --------
+
+// wuffs_base__empty_struct is used when a Wuffs function returns an empty
+// struct. In C, if a function f returns void, you can't say "x = f()", but in
+// Wuffs, if a function g returns empty, you can say "y = g()".
+typedef struct wuffs_base__empty_struct__struct {
+  // private_impl is a placeholder field. It isn't explicitly used, except that
+  // without it, the sizeof a struct with no fields can differ across C/C++
+  // compilers, and it is undefined behavior in C99. For example, gcc says that
+  // the sizeof an empty struct is 0, and g++ says that it is 1. This leads to
+  // ABI incompatibility if a Wuffs .c file is processed by one compiler and
+  // its .h file with another compiler.
+  //
+  // Instead, we explicitly insert an otherwise unused field, so that the
+  // sizeof this struct is always 1.
+  uint8_t private_impl;
+} wuffs_base__empty_struct;
+
+static inline wuffs_base__empty_struct  //
+wuffs_base__make_empty_struct() {
+  wuffs_base__empty_struct ret;
+  ret.private_impl = 0;
+  return ret;
+}
+
+// wuffs_base__utility is a placeholder receiver type. It enables what Java
+// calls static methods, as opposed to regular methods.
+typedef struct wuffs_base__utility__struct {
+  // private_impl is a placeholder field. It isn't explicitly used, except that
+  // without it, the sizeof a struct with no fields can differ across C/C++
+  // compilers, and it is undefined behavior in C99. For example, gcc says that
+  // the sizeof an empty struct is 0, and g++ says that it is 1. This leads to
+  // ABI incompatibility if a Wuffs .c file is processed by one compiler and
+  // its .h file with another compiler.
+  //
+  // Instead, we explicitly insert an otherwise unused field, so that the
+  // sizeof this struct is always 1.
+  uint8_t private_impl;
+} wuffs_base__utility;
+
+typedef struct wuffs_base__vtable__struct {
+  const char* vtable_name;
+  const void* function_pointers;
+} wuffs_base__vtable;
+
+// --------
+
+// See https://github.com/google/wuffs/blob/main/doc/note/statuses.md
+typedef struct wuffs_base__status__struct {
+  const char* repr;
+
+#ifdef __cplusplus
+  inline bool is_complete() const;
+  inline bool is_error() const;
+  inline bool is_note() const;
+  inline bool is_ok() const;
+  inline bool is_suspension() const;
+  inline const char* message() const;
+#endif  // __cplusplus
+
+} wuffs_base__status;
+
+extern const char wuffs_base__note__i_o_redirect[];
+extern const char wuffs_base__note__end_of_data[];
+extern const char wuffs_base__note__metadata_reported[];
+extern const char wuffs_base__suspension__even_more_information[];
+extern const char wuffs_base__suspension__mispositioned_read[];
+extern const char wuffs_base__suspension__mispositioned_write[];
+extern const char wuffs_base__suspension__short_read[];
+extern const char wuffs_base__suspension__short_write[];
+extern const char wuffs_base__error__bad_i_o_position[];
+extern const char wuffs_base__error__bad_argument_length_too_short[];
+extern const char wuffs_base__error__bad_argument[];
+extern const char wuffs_base__error__bad_call_sequence[];
+extern const char wuffs_base__error__bad_data[];
+extern const char wuffs_base__error__bad_receiver[];
+extern const char wuffs_base__error__bad_restart[];
+extern const char wuffs_base__error__bad_sizeof_receiver[];
+extern const char wuffs_base__error__bad_vtable[];
+extern const char wuffs_base__error__bad_workbuf_length[];
+extern const char wuffs_base__error__bad_wuffs_version[];
+extern const char wuffs_base__error__cannot_return_a_suspension[];
+extern const char wuffs_base__error__disabled_by_previous_error[];
+extern const char wuffs_base__error__initialize_falsely_claimed_already_zeroed[];
+extern const char wuffs_base__error__initialize_not_called[];
+extern const char wuffs_base__error__interleaved_coroutine_calls[];
+extern const char wuffs_base__error__no_more_information[];
+extern const char wuffs_base__error__not_enough_data[];
+extern const char wuffs_base__error__out_of_bounds[];
+extern const char wuffs_base__error__unsupported_method[];
+extern const char wuffs_base__error__unsupported_option[];
+extern const char wuffs_base__error__unsupported_pixel_swizzler_option[];
+extern const char wuffs_base__error__too_much_data[];
+
+static inline wuffs_base__status  //
+wuffs_base__make_status(const char* repr) {
+  wuffs_base__status z;
+  z.repr = repr;
+  return z;
+}
+
+static inline bool  //
+wuffs_base__status__is_complete(const wuffs_base__status* z) {
+  return (z->repr == NULL) || ((*z->repr != '$') && (*z->repr != '#'));
+}
+
+static inline bool  //
+wuffs_base__status__is_error(const wuffs_base__status* z) {
+  return z->repr && (*z->repr == '#');
+}
+
+static inline bool  //
+wuffs_base__status__is_note(const wuffs_base__status* z) {
+  return z->repr && (*z->repr != '$') && (*z->repr != '#');
+}
+
+static inline bool  //
+wuffs_base__status__is_ok(const wuffs_base__status* z) {
+  return z->repr == NULL;
+}
+
+static inline bool  //
+wuffs_base__status__is_suspension(const wuffs_base__status* z) {
+  return z->repr && (*z->repr == '$');
+}
+
+// wuffs_base__status__message strips the leading '$', '#' or '@'.
+static inline const char*  //
+wuffs_base__status__message(const wuffs_base__status* z) {
+  if (z->repr) {
+    if ((*z->repr == '$') || (*z->repr == '#') || (*z->repr == '@')) {
+      return z->repr + 1;
+    }
+  }
+  return z->repr;
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__status::is_complete() const {
+  return wuffs_base__status__is_complete(this);
+}
+
+inline bool  //
+wuffs_base__status::is_error() const {
+  return wuffs_base__status__is_error(this);
+}
+
+inline bool  //
+wuffs_base__status::is_note() const {
+  return wuffs_base__status__is_note(this);
+}
+
+inline bool  //
+wuffs_base__status::is_ok() const {
+  return wuffs_base__status__is_ok(this);
+}
+
+inline bool  //
+wuffs_base__status::is_suspension() const {
+  return wuffs_base__status__is_suspension(this);
+}
+
+inline const char*  //
+wuffs_base__status::message() const {
+  return wuffs_base__status__message(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+// WUFFS_BASE__RESULT is a result type: either a status (an error) or a value.
+//
+// A result with all fields NULL or zero is as valid as a zero-valued T.
+#define WUFFS_BASE__RESULT(T)  \
+  struct {                     \
+    wuffs_base__status status; \
+    T value;                   \
+  }
+
+typedef WUFFS_BASE__RESULT(double) wuffs_base__result_f64;
+typedef WUFFS_BASE__RESULT(int64_t) wuffs_base__result_i64;
+typedef WUFFS_BASE__RESULT(uint64_t) wuffs_base__result_u64;
+
+// --------
+
+// wuffs_base__transform__output is the result of transforming from a src slice
+// to a dst slice.
+typedef struct wuffs_base__transform__output__struct {
+  wuffs_base__status status;
+  size_t num_dst;
+  size_t num_src;
+} wuffs_base__transform__output;
+
+// --------
+
+// FourCC constants. Four Character Codes are literally four ASCII characters
+// (sometimes padded with ' ' spaces) that pack neatly into a signed or
+// unsigned 32-bit integer. ASCII letters are conventionally upper case.
+//
+// They are often used to identify video codecs (e.g. "H265") and pixel formats
+// (e.g. "YV12"). Wuffs uses them for that but also generally for naming
+// various things: compression formats (e.g. "BZ2 "), image metadata (e.g.
+// "EXIF"), file formats (e.g. "HTML"), etc.
+//
+// Wuffs' u32 values are big-endian ("JPEG" is 0x4A504547 not 0x4745504A) to
+// preserve ordering: "JPEG" < "MP3 " and 0x4A504547 < 0x4D503320.
+
+// Background Color.
+#define WUFFS_BASE__FOURCC__BGCL 0x4247434C
+
+// Bitmap.
+#define WUFFS_BASE__FOURCC__BMP 0x424D5020
+
+// Brotli.
+#define WUFFS_BASE__FOURCC__BRTL 0x4252544C
+
+// Bzip2.
+#define WUFFS_BASE__FOURCC__BZ2 0x425A3220
+
+// Concise Binary Object Representation.
+#define WUFFS_BASE__FOURCC__CBOR 0x43424F52
+
+// Primary Chromaticities and White Point.
+#define WUFFS_BASE__FOURCC__CHRM 0x4348524D
+
+// Cascading Style Sheets.
+#define WUFFS_BASE__FOURCC__CSS 0x43535320
+
+// Encapsulated PostScript.
+#define WUFFS_BASE__FOURCC__EPS 0x45505320
+
+// Exchangeable Image File Format.
+#define WUFFS_BASE__FOURCC__EXIF 0x45584946
+
+// Free Lossless Audio Codec.
+#define WUFFS_BASE__FOURCC__FLAC 0x464C4143
+
+// Gamma Correction.
+#define WUFFS_BASE__FOURCC__GAMA 0x47414D41
+
+// Graphics Interchange Format.
+#define WUFFS_BASE__FOURCC__GIF 0x47494620
+
+// GNU Zip.
+#define WUFFS_BASE__FOURCC__GZ 0x475A2020
+
+// High Efficiency Image File.
+#define WUFFS_BASE__FOURCC__HEIF 0x48454946
+
+// Hypertext Markup Language.
+#define WUFFS_BASE__FOURCC__HTML 0x48544D4C
+
+// International Color Consortium Profile.
+#define WUFFS_BASE__FOURCC__ICCP 0x49434350
+
+// Icon.
+#define WUFFS_BASE__FOURCC__ICO 0x49434F20
+
+// Icon Vector Graphics.
+#define WUFFS_BASE__FOURCC__ICVG 0x49435647
+
+// Initialization.
+#define WUFFS_BASE__FOURCC__INI 0x494E4920
+
+// Joint Photographic Experts Group.
+#define WUFFS_BASE__FOURCC__JPEG 0x4A504547
+
+// JavaScript.
+#define WUFFS_BASE__FOURCC__JS 0x4A532020
+
+// JavaScript Object Notation.
+#define WUFFS_BASE__FOURCC__JSON 0x4A534F4E
+
+// JSON With Commas and Comments.
+#define WUFFS_BASE__FOURCC__JWCC 0x4A574343
+
+// Key-Value Pair.
+#define WUFFS_BASE__FOURCC__KVP 0x4B565020
+
+// Key-Value Pair (Key).
+#define WUFFS_BASE__FOURCC__KVPK 0x4B56504B
+
+// Key-Value Pair (Value).
+#define WUFFS_BASE__FOURCC__KVPV 0x4B565056
+
+// Lempel–Ziv 4.
+#define WUFFS_BASE__FOURCC__LZ4 0x4C5A3420
+
+// Markdown.
+#define WUFFS_BASE__FOURCC__MD 0x4D442020
+
+// Modification Time.
+#define WUFFS_BASE__FOURCC__MTIM 0x4D54494D
+
+// MPEG-1 Audio Layer III.
+#define WUFFS_BASE__FOURCC__MP3 0x4D503320
+
+// Naive Image.
+#define WUFFS_BASE__FOURCC__NIE 0x4E494520
+
+// Offset (2-Dimensional).
+#define WUFFS_BASE__FOURCC__OFS2 0x4F465332
+
+// Open Type Format.
+#define WUFFS_BASE__FOURCC__OTF 0x4F544620
+
+// Portable Document Format.
+#define WUFFS_BASE__FOURCC__PDF 0x50444620
+
+// Physical Dimensions.
+#define WUFFS_BASE__FOURCC__PHYD 0x50485944
+
+// Portable Network Graphics.
+#define WUFFS_BASE__FOURCC__PNG 0x504E4720
+
+// Portable Anymap.
+#define WUFFS_BASE__FOURCC__PNM 0x504E4D20
+
+// PostScript.
+#define WUFFS_BASE__FOURCC__PS 0x50532020
+
+// Random Access Compression.
+#define WUFFS_BASE__FOURCC__RAC 0x52414320
+
+// Raw.
+#define WUFFS_BASE__FOURCC__RAW 0x52415720
+
+// Resource Interchange File Format.
+#define WUFFS_BASE__FOURCC__RIFF 0x52494646
+
+// Riegeli Records.
+#define WUFFS_BASE__FOURCC__RIGL 0x5249474C
+
+// Snappy.
+#define WUFFS_BASE__FOURCC__SNPY 0x534E5059
+
+// Standard Red Green Blue (Rendering Intent).
+#define WUFFS_BASE__FOURCC__SRGB 0x53524742
+
+// Scalable Vector Graphics.
+#define WUFFS_BASE__FOURCC__SVG 0x53564720
+
+// Tape Archive.
+#define WUFFS_BASE__FOURCC__TAR 0x54415220
+
+// Text.
+#define WUFFS_BASE__FOURCC__TEXT 0x54455854
+
+// Tagged Image File Format.
+#define WUFFS_BASE__FOURCC__TIFF 0x54494646
+
+// Tom's Obvious Minimal Language.
+#define WUFFS_BASE__FOURCC__TOML 0x544F4D4C
+
+// Waveform.
+#define WUFFS_BASE__FOURCC__WAVE 0x57415645
+
+// Wireless Bitmap.
+#define WUFFS_BASE__FOURCC__WBMP 0x57424D50
+
+// Web Open Font Format.
+#define WUFFS_BASE__FOURCC__WOFF 0x574F4646
+
+// Web Picture (VP8).
+#define WUFFS_BASE__FOURCC__WP8 0x57503820
+
+// Web Picture (VP8 Lossless).
+#define WUFFS_BASE__FOURCC__WP8L 0x5750384C
+
+// Extensible Markup Language.
+#define WUFFS_BASE__FOURCC__XML 0x584D4C20
+
+// Extensible Metadata Platform.
+#define WUFFS_BASE__FOURCC__XMP 0x584D5020
+
+// Xz.
+#define WUFFS_BASE__FOURCC__XZ 0x585A2020
+
+// Zip.
+#define WUFFS_BASE__FOURCC__ZIP 0x5A495020
+
+// Zlib.
+#define WUFFS_BASE__FOURCC__ZLIB 0x5A4C4942
+
+// Zstandard.
+#define WUFFS_BASE__FOURCC__ZSTD 0x5A535444
+
+// --------
+
+// Quirks.
+
+#define WUFFS_BASE__QUIRK_IGNORE_CHECKSUM 1
+
+// --------
+
+// Flicks are a unit of time. One flick (frame-tick) is 1 / 705_600_000 of a
+// second. See https://github.com/OculusVR/Flicks
+typedef int64_t wuffs_base__flicks;
+
+#define WUFFS_BASE__FLICKS_PER_SECOND ((uint64_t)705600000)
+#define WUFFS_BASE__FLICKS_PER_MILLISECOND ((uint64_t)705600)
+
+// ---------------- Numeric Types
+
+// The helpers below are functions, instead of macros, because their arguments
+// can be an expression that we shouldn't evaluate more than once.
+//
+// They are static, so that linking multiple wuffs .o files won't complain about
+// duplicate function definitions.
+//
+// They are explicitly marked inline, even if modern compilers don't use the
+// inline attribute to guide optimizations such as inlining, to avoid the
+// -Wunused-function warning, and we like to compile with -Wall -Werror.
+
+static inline int8_t  //
+wuffs_base__i8__min(int8_t x, int8_t y) {
+  return x < y ? x : y;
+}
+
+static inline int8_t  //
+wuffs_base__i8__max(int8_t x, int8_t y) {
+  return x > y ? x : y;
+}
+
+static inline int16_t  //
+wuffs_base__i16__min(int16_t x, int16_t y) {
+  return x < y ? x : y;
+}
+
+static inline int16_t  //
+wuffs_base__i16__max(int16_t x, int16_t y) {
+  return x > y ? x : y;
+}
+
+static inline int32_t  //
+wuffs_base__i32__min(int32_t x, int32_t y) {
+  return x < y ? x : y;
+}
+
+static inline int32_t  //
+wuffs_base__i32__max(int32_t x, int32_t y) {
+  return x > y ? x : y;
+}
+
+static inline int64_t  //
+wuffs_base__i64__min(int64_t x, int64_t y) {
+  return x < y ? x : y;
+}
+
+static inline int64_t  //
+wuffs_base__i64__max(int64_t x, int64_t y) {
+  return x > y ? x : y;
+}
+
+static inline uint8_t  //
+wuffs_base__u8__min(uint8_t x, uint8_t y) {
+  return x < y ? x : y;
+}
+
+static inline uint8_t  //
+wuffs_base__u8__max(uint8_t x, uint8_t y) {
+  return x > y ? x : y;
+}
+
+static inline uint16_t  //
+wuffs_base__u16__min(uint16_t x, uint16_t y) {
+  return x < y ? x : y;
+}
+
+static inline uint16_t  //
+wuffs_base__u16__max(uint16_t x, uint16_t y) {
+  return x > y ? x : y;
+}
+
+static inline uint32_t  //
+wuffs_base__u32__min(uint32_t x, uint32_t y) {
+  return x < y ? x : y;
+}
+
+static inline uint32_t  //
+wuffs_base__u32__max(uint32_t x, uint32_t y) {
+  return x > y ? x : y;
+}
+
+static inline uint64_t  //
+wuffs_base__u64__min(uint64_t x, uint64_t y) {
+  return x < y ? x : y;
+}
+
+static inline uint64_t  //
+wuffs_base__u64__max(uint64_t x, uint64_t y) {
+  return x > y ? x : y;
+}
+
+// --------
+
+static inline uint8_t  //
+wuffs_base__u8__rotate_left(uint8_t x, uint32_t n) {
+  n &= 7;
+  return ((uint8_t)(x << n)) | ((uint8_t)(x >> (8 - n)));
+}
+
+static inline uint8_t  //
+wuffs_base__u8__rotate_right(uint8_t x, uint32_t n) {
+  n &= 7;
+  return ((uint8_t)(x >> n)) | ((uint8_t)(x << (8 - n)));
+}
+
+static inline uint16_t  //
+wuffs_base__u16__rotate_left(uint16_t x, uint32_t n) {
+  n &= 15;
+  return ((uint16_t)(x << n)) | ((uint16_t)(x >> (16 - n)));
+}
+
+static inline uint16_t  //
+wuffs_base__u16__rotate_right(uint16_t x, uint32_t n) {
+  n &= 15;
+  return ((uint16_t)(x >> n)) | ((uint16_t)(x << (16 - n)));
+}
+
+static inline uint32_t  //
+wuffs_base__u32__rotate_left(uint32_t x, uint32_t n) {
+  n &= 31;
+  return ((uint32_t)(x << n)) | ((uint32_t)(x >> (32 - n)));
+}
+
+static inline uint32_t  //
+wuffs_base__u32__rotate_right(uint32_t x, uint32_t n) {
+  n &= 31;
+  return ((uint32_t)(x >> n)) | ((uint32_t)(x << (32 - n)));
+}
+
+static inline uint64_t  //
+wuffs_base__u64__rotate_left(uint64_t x, uint32_t n) {
+  n &= 63;
+  return ((uint64_t)(x << n)) | ((uint64_t)(x >> (64 - n)));
+}
+
+static inline uint64_t  //
+wuffs_base__u64__rotate_right(uint64_t x, uint32_t n) {
+  n &= 63;
+  return ((uint64_t)(x >> n)) | ((uint64_t)(x << (64 - n)));
+}
+
+// --------
+
+// Saturating arithmetic (sat_add, sat_sub) branchless bit-twiddling algorithms
+// are per https://locklessinc.com/articles/sat_arithmetic/
+//
+// It is important that the underlying types are unsigned integers, as signed
+// integer arithmetic overflow is undefined behavior in C.
+
+static inline uint8_t  //
+wuffs_base__u8__sat_add(uint8_t x, uint8_t y) {
+  uint8_t res = (uint8_t)(x + y);
+  res |= (uint8_t)(-(res < x));
+  return res;
+}
+
+static inline uint8_t  //
+wuffs_base__u8__sat_sub(uint8_t x, uint8_t y) {
+  uint8_t res = (uint8_t)(x - y);
+  res &= (uint8_t)(-(res <= x));
+  return res;
+}
+
+static inline uint16_t  //
+wuffs_base__u16__sat_add(uint16_t x, uint16_t y) {
+  uint16_t res = (uint16_t)(x + y);
+  res |= (uint16_t)(-(res < x));
+  return res;
+}
+
+static inline uint16_t  //
+wuffs_base__u16__sat_sub(uint16_t x, uint16_t y) {
+  uint16_t res = (uint16_t)(x - y);
+  res &= (uint16_t)(-(res <= x));
+  return res;
+}
+
+static inline uint32_t  //
+wuffs_base__u32__sat_add(uint32_t x, uint32_t y) {
+  uint32_t res = (uint32_t)(x + y);
+  res |= (uint32_t)(-(res < x));
+  return res;
+}
+
+static inline uint32_t  //
+wuffs_base__u32__sat_sub(uint32_t x, uint32_t y) {
+  uint32_t res = (uint32_t)(x - y);
+  res &= (uint32_t)(-(res <= x));
+  return res;
+}
+
+static inline uint64_t  //
+wuffs_base__u64__sat_add(uint64_t x, uint64_t y) {
+  uint64_t res = (uint64_t)(x + y);
+  res |= (uint64_t)(-(res < x));
+  return res;
+}
+
+static inline uint64_t  //
+wuffs_base__u64__sat_sub(uint64_t x, uint64_t y) {
+  uint64_t res = (uint64_t)(x - y);
+  res &= (uint64_t)(-(res <= x));
+  return res;
+}
+
+// --------
+
+typedef struct wuffs_base__multiply_u64__output__struct {
+  uint64_t lo;
+  uint64_t hi;
+} wuffs_base__multiply_u64__output;
+
+// wuffs_base__multiply_u64 returns x*y as a 128-bit value.
+//
+// The maximum inclusive output hi_lo is 0xFFFFFFFFFFFFFFFE_0000000000000001.
+static inline wuffs_base__multiply_u64__output  //
+wuffs_base__multiply_u64(uint64_t x, uint64_t y) {
+#if defined(__SIZEOF_INT128__)
+  __uint128_t z = ((__uint128_t)x) * ((__uint128_t)y);
+  wuffs_base__multiply_u64__output o;
+  o.lo = ((uint64_t)(z));
+  o.hi = ((uint64_t)(z >> 64));
+  return o;
+#else
+  // TODO: consider using the _mul128 intrinsic if defined(_MSC_VER).
+  uint64_t x0 = x & 0xFFFFFFFF;
+  uint64_t x1 = x >> 32;
+  uint64_t y0 = y & 0xFFFFFFFF;
+  uint64_t y1 = y >> 32;
+  uint64_t w0 = x0 * y0;
+  uint64_t t = (x1 * y0) + (w0 >> 32);
+  uint64_t w1 = t & 0xFFFFFFFF;
+  uint64_t w2 = t >> 32;
+  w1 += x0 * y1;
+  wuffs_base__multiply_u64__output o;
+  o.lo = x * y;
+  o.hi = (x1 * y1) + w2 + (w1 >> 32);
+  return o;
+#endif
+}
+
+// --------
+
+// The "defined(__clang__)" isn't redundant. While vanilla clang defines
+// __GNUC__, clang-cl (which mimics MSVC's cl.exe) does not.
+#if (defined(__GNUC__) || defined(__clang__)) && (__SIZEOF_LONG__ == 8)
+
+static inline uint32_t  //
+wuffs_base__count_leading_zeroes_u64(uint64_t u) {
+  return u ? ((uint32_t)(__builtin_clzl(u))) : 64u;
+}
+
+#else
+// TODO: consider using the _BitScanReverse intrinsic if defined(_MSC_VER).
+
+static inline uint32_t  //
+wuffs_base__count_leading_zeroes_u64(uint64_t u) {
+  if (u == 0) {
+    return 64;
+  }
+
+  uint32_t n = 0;
+  if ((u >> 32) == 0) {
+    n |= 32;
+    u <<= 32;
+  }
+  if ((u >> 48) == 0) {
+    n |= 16;
+    u <<= 16;
+  }
+  if ((u >> 56) == 0) {
+    n |= 8;
+    u <<= 8;
+  }
+  if ((u >> 60) == 0) {
+    n |= 4;
+    u <<= 4;
+  }
+  if ((u >> 62) == 0) {
+    n |= 2;
+    u <<= 2;
+  }
+  if ((u >> 63) == 0) {
+    n |= 1;
+    u <<= 1;
+  }
+  return n;
+}
+
+#endif  // (defined(__GNUC__) || defined(__clang__)) && (__SIZEOF_LONG__ == 8)
+
+// --------
+
+#define wuffs_base__peek_u8be__no_bounds_check \
+  wuffs_base__peek_u8__no_bounds_check
+#define wuffs_base__peek_u8le__no_bounds_check \
+  wuffs_base__peek_u8__no_bounds_check
+
+static inline uint8_t  //
+wuffs_base__peek_u8__no_bounds_check(const uint8_t* p) {
+  return p[0];
+}
+
+static inline uint16_t  //
+wuffs_base__peek_u16be__no_bounds_check(const uint8_t* p) {
+  return (uint16_t)(((uint16_t)(p[0]) << 8) | ((uint16_t)(p[1]) << 0));
+}
+
+static inline uint16_t  //
+wuffs_base__peek_u16le__no_bounds_check(const uint8_t* p) {
+  return (uint16_t)(((uint16_t)(p[0]) << 0) | ((uint16_t)(p[1]) << 8));
+}
+
+static inline uint32_t  //
+wuffs_base__peek_u24be__no_bounds_check(const uint8_t* p) {
+  return ((uint32_t)(p[0]) << 16) | ((uint32_t)(p[1]) << 8) |
+         ((uint32_t)(p[2]) << 0);
+}
+
+static inline uint32_t  //
+wuffs_base__peek_u24le__no_bounds_check(const uint8_t* p) {
+  return ((uint32_t)(p[0]) << 0) | ((uint32_t)(p[1]) << 8) |
+         ((uint32_t)(p[2]) << 16);
+}
+
+static inline uint32_t  //
+wuffs_base__peek_u32be__no_bounds_check(const uint8_t* p) {
+  return ((uint32_t)(p[0]) << 24) | ((uint32_t)(p[1]) << 16) |
+         ((uint32_t)(p[2]) << 8) | ((uint32_t)(p[3]) << 0);
+}
+
+static inline uint32_t  //
+wuffs_base__peek_u32le__no_bounds_check(const uint8_t* p) {
+  return ((uint32_t)(p[0]) << 0) | ((uint32_t)(p[1]) << 8) |
+         ((uint32_t)(p[2]) << 16) | ((uint32_t)(p[3]) << 24);
+}
+
+static inline uint64_t  //
+wuffs_base__peek_u40be__no_bounds_check(const uint8_t* p) {
+  return ((uint64_t)(p[0]) << 32) | ((uint64_t)(p[1]) << 24) |
+         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 8) |
+         ((uint64_t)(p[4]) << 0);
+}
+
+static inline uint64_t  //
+wuffs_base__peek_u40le__no_bounds_check(const uint8_t* p) {
+  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
+         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
+         ((uint64_t)(p[4]) << 32);
+}
+
+static inline uint64_t  //
+wuffs_base__peek_u48be__no_bounds_check(const uint8_t* p) {
+  return ((uint64_t)(p[0]) << 40) | ((uint64_t)(p[1]) << 32) |
+         ((uint64_t)(p[2]) << 24) | ((uint64_t)(p[3]) << 16) |
+         ((uint64_t)(p[4]) << 8) | ((uint64_t)(p[5]) << 0);
+}
+
+static inline uint64_t  //
+wuffs_base__peek_u48le__no_bounds_check(const uint8_t* p) {
+  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
+         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
+         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40);
+}
+
+static inline uint64_t  //
+wuffs_base__peek_u56be__no_bounds_check(const uint8_t* p) {
+  return ((uint64_t)(p[0]) << 48) | ((uint64_t)(p[1]) << 40) |
+         ((uint64_t)(p[2]) << 32) | ((uint64_t)(p[3]) << 24) |
+         ((uint64_t)(p[4]) << 16) | ((uint64_t)(p[5]) << 8) |
+         ((uint64_t)(p[6]) << 0);
+}
+
+static inline uint64_t  //
+wuffs_base__peek_u56le__no_bounds_check(const uint8_t* p) {
+  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
+         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
+         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40) |
+         ((uint64_t)(p[6]) << 48);
+}
+
+static inline uint64_t  //
+wuffs_base__peek_u64be__no_bounds_check(const uint8_t* p) {
+  return ((uint64_t)(p[0]) << 56) | ((uint64_t)(p[1]) << 48) |
+         ((uint64_t)(p[2]) << 40) | ((uint64_t)(p[3]) << 32) |
+         ((uint64_t)(p[4]) << 24) | ((uint64_t)(p[5]) << 16) |
+         ((uint64_t)(p[6]) << 8) | ((uint64_t)(p[7]) << 0);
+}
+
+static inline uint64_t  //
+wuffs_base__peek_u64le__no_bounds_check(const uint8_t* p) {
+  return ((uint64_t)(p[0]) << 0) | ((uint64_t)(p[1]) << 8) |
+         ((uint64_t)(p[2]) << 16) | ((uint64_t)(p[3]) << 24) |
+         ((uint64_t)(p[4]) << 32) | ((uint64_t)(p[5]) << 40) |
+         ((uint64_t)(p[6]) << 48) | ((uint64_t)(p[7]) << 56);
+}
+
+// --------
+
+#define wuffs_base__poke_u8be__no_bounds_check \
+  wuffs_base__poke_u8__no_bounds_check
+#define wuffs_base__poke_u8le__no_bounds_check \
+  wuffs_base__poke_u8__no_bounds_check
+
+static inline void  //
+wuffs_base__poke_u8__no_bounds_check(uint8_t* p, uint8_t x) {
+  p[0] = x;
+}
+
+static inline void  //
+wuffs_base__poke_u16be__no_bounds_check(uint8_t* p, uint16_t x) {
+  p[0] = (uint8_t)(x >> 8);
+  p[1] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__poke_u16le__no_bounds_check(uint8_t* p, uint16_t x) {
+#if defined(__GNUC__) && !defined(__clang__) && defined(__x86_64__)
+  // This seems to perform better on gcc 10 (but not clang 9). Clang also
+  // defines "__GNUC__".
+  memcpy(p, &x, 2);
+#else
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+#endif
+}
+
+static inline void  //
+wuffs_base__poke_u24be__no_bounds_check(uint8_t* p, uint32_t x) {
+  p[0] = (uint8_t)(x >> 16);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__poke_u24le__no_bounds_check(uint8_t* p, uint32_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+}
+
+static inline void  //
+wuffs_base__poke_u32be__no_bounds_check(uint8_t* p, uint32_t x) {
+  p[0] = (uint8_t)(x >> 24);
+  p[1] = (uint8_t)(x >> 16);
+  p[2] = (uint8_t)(x >> 8);
+  p[3] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__poke_u32le__no_bounds_check(uint8_t* p, uint32_t x) {
+#if defined(__GNUC__) && !defined(__clang__) && defined(__x86_64__)
+  // This seems to perform better on gcc 10 (but not clang 9). Clang also
+  // defines "__GNUC__".
+  memcpy(p, &x, 4);
+#else
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 24);
+#endif
+}
+
+static inline void  //
+wuffs_base__poke_u40be__no_bounds_check(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 32);
+  p[1] = (uint8_t)(x >> 24);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 8);
+  p[4] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__poke_u40le__no_bounds_check(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 24);
+  p[4] = (uint8_t)(x >> 32);
+}
+
+static inline void  //
+wuffs_base__poke_u48be__no_bounds_check(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 40);
+  p[1] = (uint8_t)(x >> 32);
+  p[2] = (uint8_t)(x >> 24);
+  p[3] = (uint8_t)(x >> 16);
+  p[4] = (uint8_t)(x >> 8);
+  p[5] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__poke_u48le__no_bounds_check(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 24);
+  p[4] = (uint8_t)(x >> 32);
+  p[5] = (uint8_t)(x >> 40);
+}
+
+static inline void  //
+wuffs_base__poke_u56be__no_bounds_check(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 48);
+  p[1] = (uint8_t)(x >> 40);
+  p[2] = (uint8_t)(x >> 32);
+  p[3] = (uint8_t)(x >> 24);
+  p[4] = (uint8_t)(x >> 16);
+  p[5] = (uint8_t)(x >> 8);
+  p[6] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__poke_u56le__no_bounds_check(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 24);
+  p[4] = (uint8_t)(x >> 32);
+  p[5] = (uint8_t)(x >> 40);
+  p[6] = (uint8_t)(x >> 48);
+}
+
+static inline void  //
+wuffs_base__poke_u64be__no_bounds_check(uint8_t* p, uint64_t x) {
+  p[0] = (uint8_t)(x >> 56);
+  p[1] = (uint8_t)(x >> 48);
+  p[2] = (uint8_t)(x >> 40);
+  p[3] = (uint8_t)(x >> 32);
+  p[4] = (uint8_t)(x >> 24);
+  p[5] = (uint8_t)(x >> 16);
+  p[6] = (uint8_t)(x >> 8);
+  p[7] = (uint8_t)(x >> 0);
+}
+
+static inline void  //
+wuffs_base__poke_u64le__no_bounds_check(uint8_t* p, uint64_t x) {
+#if defined(__GNUC__) && !defined(__clang__) && defined(__x86_64__)
+  // This seems to perform better on gcc 10 (but not clang 9). Clang also
+  // defines "__GNUC__".
+  memcpy(p, &x, 8);
+#else
+  p[0] = (uint8_t)(x >> 0);
+  p[1] = (uint8_t)(x >> 8);
+  p[2] = (uint8_t)(x >> 16);
+  p[3] = (uint8_t)(x >> 24);
+  p[4] = (uint8_t)(x >> 32);
+  p[5] = (uint8_t)(x >> 40);
+  p[6] = (uint8_t)(x >> 48);
+  p[7] = (uint8_t)(x >> 56);
+#endif
+}
+
+// --------
+
+// Load and Store functions are deprecated. Use Peek and Poke instead.
+
+#define wuffs_base__load_u8__no_bounds_check \
+  wuffs_base__peek_u8__no_bounds_check
+#define wuffs_base__load_u16be__no_bounds_check \
+  wuffs_base__peek_u16be__no_bounds_check
+#define wuffs_base__load_u16le__no_bounds_check \
+  wuffs_base__peek_u16le__no_bounds_check
+#define wuffs_base__load_u24be__no_bounds_check \
+  wuffs_base__peek_u24be__no_bounds_check
+#define wuffs_base__load_u24le__no_bounds_check \
+  wuffs_base__peek_u24le__no_bounds_check
+#define wuffs_base__load_u32be__no_bounds_check \
+  wuffs_base__peek_u32be__no_bounds_check
+#define wuffs_base__load_u32le__no_bounds_check \
+  wuffs_base__peek_u32le__no_bounds_check
+#define wuffs_base__load_u40be__no_bounds_check \
+  wuffs_base__peek_u40be__no_bounds_check
+#define wuffs_base__load_u40le__no_bounds_check \
+  wuffs_base__peek_u40le__no_bounds_check
+#define wuffs_base__load_u48be__no_bounds_check \
+  wuffs_base__peek_u48be__no_bounds_check
+#define wuffs_base__load_u48le__no_bounds_check \
+  wuffs_base__peek_u48le__no_bounds_check
+#define wuffs_base__load_u56be__no_bounds_check \
+  wuffs_base__peek_u56be__no_bounds_check
+#define wuffs_base__load_u56le__no_bounds_check \
+  wuffs_base__peek_u56le__no_bounds_check
+#define wuffs_base__load_u64be__no_bounds_check \
+  wuffs_base__peek_u64be__no_bounds_check
+#define wuffs_base__load_u64le__no_bounds_check \
+  wuffs_base__peek_u64le__no_bounds_check
+
+#define wuffs_base__store_u8__no_bounds_check \
+  wuffs_base__poke_u8__no_bounds_check
+#define wuffs_base__store_u16be__no_bounds_check \
+  wuffs_base__poke_u16be__no_bounds_check
+#define wuffs_base__store_u16le__no_bounds_check \
+  wuffs_base__poke_u16le__no_bounds_check
+#define wuffs_base__store_u24be__no_bounds_check \
+  wuffs_base__poke_u24be__no_bounds_check
+#define wuffs_base__store_u24le__no_bounds_check \
+  wuffs_base__poke_u24le__no_bounds_check
+#define wuffs_base__store_u32be__no_bounds_check \
+  wuffs_base__poke_u32be__no_bounds_check
+#define wuffs_base__store_u32le__no_bounds_check \
+  wuffs_base__poke_u32le__no_bounds_check
+#define wuffs_base__store_u40be__no_bounds_check \
+  wuffs_base__poke_u40be__no_bounds_check
+#define wuffs_base__store_u40le__no_bounds_check \
+  wuffs_base__poke_u40le__no_bounds_check
+#define wuffs_base__store_u48be__no_bounds_check \
+  wuffs_base__poke_u48be__no_bounds_check
+#define wuffs_base__store_u48le__no_bounds_check \
+  wuffs_base__poke_u48le__no_bounds_check
+#define wuffs_base__store_u56be__no_bounds_check \
+  wuffs_base__poke_u56be__no_bounds_check
+#define wuffs_base__store_u56le__no_bounds_check \
+  wuffs_base__poke_u56le__no_bounds_check
+#define wuffs_base__store_u64be__no_bounds_check \
+  wuffs_base__poke_u64be__no_bounds_check
+#define wuffs_base__store_u64le__no_bounds_check \
+  wuffs_base__poke_u64le__no_bounds_check
+
+// ---------------- Slices and Tables
+
+// WUFFS_BASE__SLICE is a 1-dimensional buffer.
+//
+// len measures a number of elements, not necessarily a size in bytes.
+//
+// A value with all fields NULL or zero is a valid, empty slice.
+#define WUFFS_BASE__SLICE(T) \
+  struct {                   \
+    T* ptr;                  \
+    size_t len;              \
+  }
+
+// WUFFS_BASE__TABLE is a 2-dimensional buffer.
+//
+// width, height and stride measure a number of elements, not necessarily a
+// size in bytes.
+//
+// A value with all fields NULL or zero is a valid, empty table.
+#define WUFFS_BASE__TABLE(T) \
+  struct {                   \
+    T* ptr;                  \
+    size_t width;            \
+    size_t height;           \
+    size_t stride;           \
+  }
+
+typedef WUFFS_BASE__SLICE(uint8_t) wuffs_base__slice_u8;
+typedef WUFFS_BASE__SLICE(uint16_t) wuffs_base__slice_u16;
+typedef WUFFS_BASE__SLICE(uint32_t) wuffs_base__slice_u32;
+typedef WUFFS_BASE__SLICE(uint64_t) wuffs_base__slice_u64;
+
+typedef WUFFS_BASE__TABLE(uint8_t) wuffs_base__table_u8;
+typedef WUFFS_BASE__TABLE(uint16_t) wuffs_base__table_u16;
+typedef WUFFS_BASE__TABLE(uint32_t) wuffs_base__table_u32;
+typedef WUFFS_BASE__TABLE(uint64_t) wuffs_base__table_u64;
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__make_slice_u8(uint8_t* ptr, size_t len) {
+  wuffs_base__slice_u8 ret;
+  ret.ptr = ptr;
+  ret.len = len;
+  return ret;
+}
+
+static inline wuffs_base__slice_u16  //
+wuffs_base__make_slice_u16(uint16_t* ptr, size_t len) {
+  wuffs_base__slice_u16 ret;
+  ret.ptr = ptr;
+  ret.len = len;
+  return ret;
+}
+
+static inline wuffs_base__slice_u32  //
+wuffs_base__make_slice_u32(uint32_t* ptr, size_t len) {
+  wuffs_base__slice_u32 ret;
+  ret.ptr = ptr;
+  ret.len = len;
+  return ret;
+}
+
+static inline wuffs_base__slice_u64  //
+wuffs_base__make_slice_u64(uint64_t* ptr, size_t len) {
+  wuffs_base__slice_u64 ret;
+  ret.ptr = ptr;
+  ret.len = len;
+  return ret;
+}
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__empty_slice_u8() {
+  wuffs_base__slice_u8 ret;
+  ret.ptr = NULL;
+  ret.len = 0;
+  return ret;
+}
+
+static inline wuffs_base__slice_u16  //
+wuffs_base__empty_slice_u16() {
+  wuffs_base__slice_u16 ret;
+  ret.ptr = NULL;
+  ret.len = 0;
+  return ret;
+}
+
+static inline wuffs_base__slice_u32  //
+wuffs_base__empty_slice_u32() {
+  wuffs_base__slice_u32 ret;
+  ret.ptr = NULL;
+  ret.len = 0;
+  return ret;
+}
+
+static inline wuffs_base__slice_u64  //
+wuffs_base__empty_slice_u64() {
+  wuffs_base__slice_u64 ret;
+  ret.ptr = NULL;
+  ret.len = 0;
+  return ret;
+}
+
+static inline wuffs_base__table_u8  //
+wuffs_base__make_table_u8(uint8_t* ptr,
+                          size_t width,
+                          size_t height,
+                          size_t stride) {
+  wuffs_base__table_u8 ret;
+  ret.ptr = ptr;
+  ret.width = width;
+  ret.height = height;
+  ret.stride = stride;
+  return ret;
+}
+
+static inline wuffs_base__table_u16  //
+wuffs_base__make_table_u16(uint16_t* ptr,
+                           size_t width,
+                           size_t height,
+                           size_t stride) {
+  wuffs_base__table_u16 ret;
+  ret.ptr = ptr;
+  ret.width = width;
+  ret.height = height;
+  ret.stride = stride;
+  return ret;
+}
+
+static inline wuffs_base__table_u32  //
+wuffs_base__make_table_u32(uint32_t* ptr,
+                           size_t width,
+                           size_t height,
+                           size_t stride) {
+  wuffs_base__table_u32 ret;
+  ret.ptr = ptr;
+  ret.width = width;
+  ret.height = height;
+  ret.stride = stride;
+  return ret;
+}
+
+static inline wuffs_base__table_u64  //
+wuffs_base__make_table_u64(uint64_t* ptr,
+                           size_t width,
+                           size_t height,
+                           size_t stride) {
+  wuffs_base__table_u64 ret;
+  ret.ptr = ptr;
+  ret.width = width;
+  ret.height = height;
+  ret.stride = stride;
+  return ret;
+}
+
+static inline wuffs_base__table_u8  //
+wuffs_base__empty_table_u8() {
+  wuffs_base__table_u8 ret;
+  ret.ptr = NULL;
+  ret.width = 0;
+  ret.height = 0;
+  ret.stride = 0;
+  return ret;
+}
+
+static inline wuffs_base__table_u16  //
+wuffs_base__empty_table_u16() {
+  wuffs_base__table_u16 ret;
+  ret.ptr = NULL;
+  ret.width = 0;
+  ret.height = 0;
+  ret.stride = 0;
+  return ret;
+}
+
+static inline wuffs_base__table_u32  //
+wuffs_base__empty_table_u32() {
+  wuffs_base__table_u32 ret;
+  ret.ptr = NULL;
+  ret.width = 0;
+  ret.height = 0;
+  ret.stride = 0;
+  return ret;
+}
+
+static inline wuffs_base__table_u64  //
+wuffs_base__empty_table_u64() {
+  wuffs_base__table_u64 ret;
+  ret.ptr = NULL;
+  ret.width = 0;
+  ret.height = 0;
+  ret.stride = 0;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__slice_u8__overlaps(wuffs_base__slice_u8 s, wuffs_base__slice_u8 t) {
+  return ((s.ptr <= t.ptr) && (t.ptr < (s.ptr + s.len))) ||
+         ((t.ptr <= s.ptr) && (s.ptr < (t.ptr + t.len)));
+}
+
+// wuffs_base__slice_u8__subslice_i returns s[i:].
+//
+// It returns an empty slice if i is out of bounds.
+static inline wuffs_base__slice_u8  //
+wuffs_base__slice_u8__subslice_i(wuffs_base__slice_u8 s, uint64_t i) {
+  if ((i <= SIZE_MAX) && (i <= s.len)) {
+    return wuffs_base__make_slice_u8(s.ptr + i, ((size_t)(s.len - i)));
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+// wuffs_base__slice_u8__subslice_j returns s[:j].
+//
+// It returns an empty slice if j is out of bounds.
+static inline wuffs_base__slice_u8  //
+wuffs_base__slice_u8__subslice_j(wuffs_base__slice_u8 s, uint64_t j) {
+  if ((j <= SIZE_MAX) && (j <= s.len)) {
+    return wuffs_base__make_slice_u8(s.ptr, ((size_t)j));
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+// wuffs_base__slice_u8__subslice_ij returns s[i:j].
+//
+// It returns an empty slice if i or j is out of bounds.
+static inline wuffs_base__slice_u8  //
+wuffs_base__slice_u8__subslice_ij(wuffs_base__slice_u8 s,
+                                  uint64_t i,
+                                  uint64_t j) {
+  if ((i <= j) && (j <= SIZE_MAX) && (j <= s.len)) {
+    return wuffs_base__make_slice_u8(s.ptr + i, ((size_t)(j - i)));
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+// wuffs_base__table_u8__subtable_ij returns t[ix:jx, iy:jy].
+//
+// It returns an empty table if i or j is out of bounds.
+static inline wuffs_base__table_u8  //
+wuffs_base__table_u8__subtable_ij(wuffs_base__table_u8 t,
+                                  uint64_t ix,
+                                  uint64_t iy,
+                                  uint64_t jx,
+                                  uint64_t jy) {
+  if ((ix <= jx) && (jx <= SIZE_MAX) && (jx <= t.width) &&  //
+      (iy <= jy) && (jy <= SIZE_MAX) && (jy <= t.height)) {
+    return wuffs_base__make_table_u8(t.ptr + ix + (iy * t.stride),  //
+                                     ((size_t)(jx - ix)),           //
+                                     ((size_t)(jy - iy)),           //
+                                     t.stride);                     //
+  }
+  return wuffs_base__make_table_u8(NULL, 0, 0, 0);
+}
+
+// wuffs_base__table__flattened_length returns the number of elements covered
+// by the 1-dimensional span that backs a 2-dimensional table. This counts the
+// elements inside the table and, when width != stride, the elements outside
+// the table but between its rows.
+//
+// For example, consider a width 10, height 4, stride 10 table. Mark its first
+// and last (inclusive) elements with 'a' and 'z'. This function returns 40.
+//
+//    a123456789
+//    0123456789
+//    0123456789
+//    012345678z
+//
+// Now consider the sub-table of that from (2, 1) inclusive to (8, 4) exclusive.
+//
+//    a123456789
+//    01iiiiiioo
+//    ooiiiiiioo
+//    ooiiiiii8z
+//
+// This function (called with width 6, height 3, stride 10) returns 26: 18 'i'
+// inside elements plus 8 'o' outside elements. Note that 26 is less than a
+// naive (height * stride = 30) computation. Indeed, advancing 29 elements from
+// the first 'i' would venture past 'z', out of bounds of the original table.
+//
+// It does not check for overflow, but if the arguments come from a table that
+// exists in memory and each element occupies a positive number of bytes then
+// the result should be bounded by the amount of allocatable memory (which
+// shouldn't overflow SIZE_MAX).
+static inline size_t  //
+wuffs_base__table__flattened_length(size_t width,
+                                    size_t height,
+                                    size_t stride) {
+  if (height == 0) {
+    return 0;
+  }
+  return ((height - 1) * stride) + width;
+}
+
+// ---------------- Magic Numbers
+
+// wuffs_base__magic_number_guess_fourcc guesses the file format of some data,
+// given its opening bytes. It returns a positive FourCC value on success.
+//
+// It returns zero if nothing matches its hard-coded list of 'magic numbers'.
+//
+// It returns a negative value if a longer prefix is required for a conclusive
+// result. For example, seeing a single 'B' byte is not enough to discriminate
+// the BMP and BPG image file formats.
+//
+// It does not do a full validity check. Like any guess made from a short
+// prefix of the data, it may return false positives. Data that starts with 99
+// bytes of valid JPEG followed by corruption or truncation is an invalid JPEG
+// image overall, but this function will still return WUFFS_BASE__FOURCC__JPEG.
+//
+// Another source of false positives is that some 'magic numbers' are valid
+// ASCII data. A file starting with "GIF87a and GIF89a are the two versions of
+// GIF" will match GIF's 'magic number' even if it's plain text, not an image.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__MAGIC sub-module, not just
+// WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC int32_t  //
+wuffs_base__magic_number_guess_fourcc(wuffs_base__slice_u8 prefix);
+
+// ---------------- Ranges and Rects
+
+// See https://github.com/google/wuffs/blob/main/doc/note/ranges-and-rects.md
+
+typedef struct wuffs_base__range_ii_u32__struct {
+  uint32_t min_incl;
+  uint32_t max_incl;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__range_ii_u32__struct s) const;
+  inline wuffs_base__range_ii_u32__struct intersect(
+      wuffs_base__range_ii_u32__struct s) const;
+  inline wuffs_base__range_ii_u32__struct unite(
+      wuffs_base__range_ii_u32__struct s) const;
+  inline bool contains(uint32_t x) const;
+  inline bool contains_range(wuffs_base__range_ii_u32__struct s) const;
+#endif  // __cplusplus
+
+} wuffs_base__range_ii_u32;
+
+static inline wuffs_base__range_ii_u32  //
+wuffs_base__empty_range_ii_u32() {
+  wuffs_base__range_ii_u32 ret;
+  ret.min_incl = 0;
+  ret.max_incl = 0;
+  return ret;
+}
+
+static inline wuffs_base__range_ii_u32  //
+wuffs_base__make_range_ii_u32(uint32_t min_incl, uint32_t max_incl) {
+  wuffs_base__range_ii_u32 ret;
+  ret.min_incl = min_incl;
+  ret.max_incl = max_incl;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u32__is_empty(const wuffs_base__range_ii_u32* r) {
+  return r->min_incl > r->max_incl;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u32__equals(const wuffs_base__range_ii_u32* r,
+                                 wuffs_base__range_ii_u32 s) {
+  return (r->min_incl == s.min_incl && r->max_incl == s.max_incl) ||
+         (wuffs_base__range_ii_u32__is_empty(r) &&
+          wuffs_base__range_ii_u32__is_empty(&s));
+}
+
+static inline wuffs_base__range_ii_u32  //
+wuffs_base__range_ii_u32__intersect(const wuffs_base__range_ii_u32* r,
+                                    wuffs_base__range_ii_u32 s) {
+  wuffs_base__range_ii_u32 t;
+  t.min_incl = wuffs_base__u32__max(r->min_incl, s.min_incl);
+  t.max_incl = wuffs_base__u32__min(r->max_incl, s.max_incl);
+  return t;
+}
+
+static inline wuffs_base__range_ii_u32  //
+wuffs_base__range_ii_u32__unite(const wuffs_base__range_ii_u32* r,
+                                wuffs_base__range_ii_u32 s) {
+  if (wuffs_base__range_ii_u32__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__range_ii_u32__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__range_ii_u32 t;
+  t.min_incl = wuffs_base__u32__min(r->min_incl, s.min_incl);
+  t.max_incl = wuffs_base__u32__max(r->max_incl, s.max_incl);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u32__contains(const wuffs_base__range_ii_u32* r,
+                                   uint32_t x) {
+  return (r->min_incl <= x) && (x <= r->max_incl);
+}
+
+static inline bool  //
+wuffs_base__range_ii_u32__contains_range(const wuffs_base__range_ii_u32* r,
+                                         wuffs_base__range_ii_u32 s) {
+  return wuffs_base__range_ii_u32__equals(
+      &s, wuffs_base__range_ii_u32__intersect(r, s));
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__range_ii_u32::is_empty() const {
+  return wuffs_base__range_ii_u32__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__range_ii_u32::equals(wuffs_base__range_ii_u32 s) const {
+  return wuffs_base__range_ii_u32__equals(this, s);
+}
+
+inline wuffs_base__range_ii_u32  //
+wuffs_base__range_ii_u32::intersect(wuffs_base__range_ii_u32 s) const {
+  return wuffs_base__range_ii_u32__intersect(this, s);
+}
+
+inline wuffs_base__range_ii_u32  //
+wuffs_base__range_ii_u32::unite(wuffs_base__range_ii_u32 s) const {
+  return wuffs_base__range_ii_u32__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__range_ii_u32::contains(uint32_t x) const {
+  return wuffs_base__range_ii_u32__contains(this, x);
+}
+
+inline bool  //
+wuffs_base__range_ii_u32::contains_range(wuffs_base__range_ii_u32 s) const {
+  return wuffs_base__range_ii_u32__contains_range(this, s);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__range_ie_u32__struct {
+  uint32_t min_incl;
+  uint32_t max_excl;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__range_ie_u32__struct s) const;
+  inline wuffs_base__range_ie_u32__struct intersect(
+      wuffs_base__range_ie_u32__struct s) const;
+  inline wuffs_base__range_ie_u32__struct unite(
+      wuffs_base__range_ie_u32__struct s) const;
+  inline bool contains(uint32_t x) const;
+  inline bool contains_range(wuffs_base__range_ie_u32__struct s) const;
+  inline uint32_t length() const;
+#endif  // __cplusplus
+
+} wuffs_base__range_ie_u32;
+
+static inline wuffs_base__range_ie_u32  //
+wuffs_base__empty_range_ie_u32() {
+  wuffs_base__range_ie_u32 ret;
+  ret.min_incl = 0;
+  ret.max_excl = 0;
+  return ret;
+}
+
+static inline wuffs_base__range_ie_u32  //
+wuffs_base__make_range_ie_u32(uint32_t min_incl, uint32_t max_excl) {
+  wuffs_base__range_ie_u32 ret;
+  ret.min_incl = min_incl;
+  ret.max_excl = max_excl;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u32__is_empty(const wuffs_base__range_ie_u32* r) {
+  return r->min_incl >= r->max_excl;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u32__equals(const wuffs_base__range_ie_u32* r,
+                                 wuffs_base__range_ie_u32 s) {
+  return (r->min_incl == s.min_incl && r->max_excl == s.max_excl) ||
+         (wuffs_base__range_ie_u32__is_empty(r) &&
+          wuffs_base__range_ie_u32__is_empty(&s));
+}
+
+static inline wuffs_base__range_ie_u32  //
+wuffs_base__range_ie_u32__intersect(const wuffs_base__range_ie_u32* r,
+                                    wuffs_base__range_ie_u32 s) {
+  wuffs_base__range_ie_u32 t;
+  t.min_incl = wuffs_base__u32__max(r->min_incl, s.min_incl);
+  t.max_excl = wuffs_base__u32__min(r->max_excl, s.max_excl);
+  return t;
+}
+
+static inline wuffs_base__range_ie_u32  //
+wuffs_base__range_ie_u32__unite(const wuffs_base__range_ie_u32* r,
+                                wuffs_base__range_ie_u32 s) {
+  if (wuffs_base__range_ie_u32__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__range_ie_u32__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__range_ie_u32 t;
+  t.min_incl = wuffs_base__u32__min(r->min_incl, s.min_incl);
+  t.max_excl = wuffs_base__u32__max(r->max_excl, s.max_excl);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u32__contains(const wuffs_base__range_ie_u32* r,
+                                   uint32_t x) {
+  return (r->min_incl <= x) && (x < r->max_excl);
+}
+
+static inline bool  //
+wuffs_base__range_ie_u32__contains_range(const wuffs_base__range_ie_u32* r,
+                                         wuffs_base__range_ie_u32 s) {
+  return wuffs_base__range_ie_u32__equals(
+      &s, wuffs_base__range_ie_u32__intersect(r, s));
+}
+
+static inline uint32_t  //
+wuffs_base__range_ie_u32__length(const wuffs_base__range_ie_u32* r) {
+  return wuffs_base__u32__sat_sub(r->max_excl, r->min_incl);
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__range_ie_u32::is_empty() const {
+  return wuffs_base__range_ie_u32__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__range_ie_u32::equals(wuffs_base__range_ie_u32 s) const {
+  return wuffs_base__range_ie_u32__equals(this, s);
+}
+
+inline wuffs_base__range_ie_u32  //
+wuffs_base__range_ie_u32::intersect(wuffs_base__range_ie_u32 s) const {
+  return wuffs_base__range_ie_u32__intersect(this, s);
+}
+
+inline wuffs_base__range_ie_u32  //
+wuffs_base__range_ie_u32::unite(wuffs_base__range_ie_u32 s) const {
+  return wuffs_base__range_ie_u32__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__range_ie_u32::contains(uint32_t x) const {
+  return wuffs_base__range_ie_u32__contains(this, x);
+}
+
+inline bool  //
+wuffs_base__range_ie_u32::contains_range(wuffs_base__range_ie_u32 s) const {
+  return wuffs_base__range_ie_u32__contains_range(this, s);
+}
+
+inline uint32_t  //
+wuffs_base__range_ie_u32::length() const {
+  return wuffs_base__range_ie_u32__length(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__range_ii_u64__struct {
+  uint64_t min_incl;
+  uint64_t max_incl;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__range_ii_u64__struct s) const;
+  inline wuffs_base__range_ii_u64__struct intersect(
+      wuffs_base__range_ii_u64__struct s) const;
+  inline wuffs_base__range_ii_u64__struct unite(
+      wuffs_base__range_ii_u64__struct s) const;
+  inline bool contains(uint64_t x) const;
+  inline bool contains_range(wuffs_base__range_ii_u64__struct s) const;
+#endif  // __cplusplus
+
+} wuffs_base__range_ii_u64;
+
+static inline wuffs_base__range_ii_u64  //
+wuffs_base__empty_range_ii_u64() {
+  wuffs_base__range_ii_u64 ret;
+  ret.min_incl = 0;
+  ret.max_incl = 0;
+  return ret;
+}
+
+static inline wuffs_base__range_ii_u64  //
+wuffs_base__make_range_ii_u64(uint64_t min_incl, uint64_t max_incl) {
+  wuffs_base__range_ii_u64 ret;
+  ret.min_incl = min_incl;
+  ret.max_incl = max_incl;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u64__is_empty(const wuffs_base__range_ii_u64* r) {
+  return r->min_incl > r->max_incl;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u64__equals(const wuffs_base__range_ii_u64* r,
+                                 wuffs_base__range_ii_u64 s) {
+  return (r->min_incl == s.min_incl && r->max_incl == s.max_incl) ||
+         (wuffs_base__range_ii_u64__is_empty(r) &&
+          wuffs_base__range_ii_u64__is_empty(&s));
+}
+
+static inline wuffs_base__range_ii_u64  //
+wuffs_base__range_ii_u64__intersect(const wuffs_base__range_ii_u64* r,
+                                    wuffs_base__range_ii_u64 s) {
+  wuffs_base__range_ii_u64 t;
+  t.min_incl = wuffs_base__u64__max(r->min_incl, s.min_incl);
+  t.max_incl = wuffs_base__u64__min(r->max_incl, s.max_incl);
+  return t;
+}
+
+static inline wuffs_base__range_ii_u64  //
+wuffs_base__range_ii_u64__unite(const wuffs_base__range_ii_u64* r,
+                                wuffs_base__range_ii_u64 s) {
+  if (wuffs_base__range_ii_u64__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__range_ii_u64__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__range_ii_u64 t;
+  t.min_incl = wuffs_base__u64__min(r->min_incl, s.min_incl);
+  t.max_incl = wuffs_base__u64__max(r->max_incl, s.max_incl);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__range_ii_u64__contains(const wuffs_base__range_ii_u64* r,
+                                   uint64_t x) {
+  return (r->min_incl <= x) && (x <= r->max_incl);
+}
+
+static inline bool  //
+wuffs_base__range_ii_u64__contains_range(const wuffs_base__range_ii_u64* r,
+                                         wuffs_base__range_ii_u64 s) {
+  return wuffs_base__range_ii_u64__equals(
+      &s, wuffs_base__range_ii_u64__intersect(r, s));
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__range_ii_u64::is_empty() const {
+  return wuffs_base__range_ii_u64__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__range_ii_u64::equals(wuffs_base__range_ii_u64 s) const {
+  return wuffs_base__range_ii_u64__equals(this, s);
+}
+
+inline wuffs_base__range_ii_u64  //
+wuffs_base__range_ii_u64::intersect(wuffs_base__range_ii_u64 s) const {
+  return wuffs_base__range_ii_u64__intersect(this, s);
+}
+
+inline wuffs_base__range_ii_u64  //
+wuffs_base__range_ii_u64::unite(wuffs_base__range_ii_u64 s) const {
+  return wuffs_base__range_ii_u64__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__range_ii_u64::contains(uint64_t x) const {
+  return wuffs_base__range_ii_u64__contains(this, x);
+}
+
+inline bool  //
+wuffs_base__range_ii_u64::contains_range(wuffs_base__range_ii_u64 s) const {
+  return wuffs_base__range_ii_u64__contains_range(this, s);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__range_ie_u64__struct {
+  uint64_t min_incl;
+  uint64_t max_excl;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__range_ie_u64__struct s) const;
+  inline wuffs_base__range_ie_u64__struct intersect(
+      wuffs_base__range_ie_u64__struct s) const;
+  inline wuffs_base__range_ie_u64__struct unite(
+      wuffs_base__range_ie_u64__struct s) const;
+  inline bool contains(uint64_t x) const;
+  inline bool contains_range(wuffs_base__range_ie_u64__struct s) const;
+  inline uint64_t length() const;
+#endif  // __cplusplus
+
+} wuffs_base__range_ie_u64;
+
+static inline wuffs_base__range_ie_u64  //
+wuffs_base__empty_range_ie_u64() {
+  wuffs_base__range_ie_u64 ret;
+  ret.min_incl = 0;
+  ret.max_excl = 0;
+  return ret;
+}
+
+static inline wuffs_base__range_ie_u64  //
+wuffs_base__make_range_ie_u64(uint64_t min_incl, uint64_t max_excl) {
+  wuffs_base__range_ie_u64 ret;
+  ret.min_incl = min_incl;
+  ret.max_excl = max_excl;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u64__is_empty(const wuffs_base__range_ie_u64* r) {
+  return r->min_incl >= r->max_excl;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u64__equals(const wuffs_base__range_ie_u64* r,
+                                 wuffs_base__range_ie_u64 s) {
+  return (r->min_incl == s.min_incl && r->max_excl == s.max_excl) ||
+         (wuffs_base__range_ie_u64__is_empty(r) &&
+          wuffs_base__range_ie_u64__is_empty(&s));
+}
+
+static inline wuffs_base__range_ie_u64  //
+wuffs_base__range_ie_u64__intersect(const wuffs_base__range_ie_u64* r,
+                                    wuffs_base__range_ie_u64 s) {
+  wuffs_base__range_ie_u64 t;
+  t.min_incl = wuffs_base__u64__max(r->min_incl, s.min_incl);
+  t.max_excl = wuffs_base__u64__min(r->max_excl, s.max_excl);
+  return t;
+}
+
+static inline wuffs_base__range_ie_u64  //
+wuffs_base__range_ie_u64__unite(const wuffs_base__range_ie_u64* r,
+                                wuffs_base__range_ie_u64 s) {
+  if (wuffs_base__range_ie_u64__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__range_ie_u64__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__range_ie_u64 t;
+  t.min_incl = wuffs_base__u64__min(r->min_incl, s.min_incl);
+  t.max_excl = wuffs_base__u64__max(r->max_excl, s.max_excl);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__range_ie_u64__contains(const wuffs_base__range_ie_u64* r,
+                                   uint64_t x) {
+  return (r->min_incl <= x) && (x < r->max_excl);
+}
+
+static inline bool  //
+wuffs_base__range_ie_u64__contains_range(const wuffs_base__range_ie_u64* r,
+                                         wuffs_base__range_ie_u64 s) {
+  return wuffs_base__range_ie_u64__equals(
+      &s, wuffs_base__range_ie_u64__intersect(r, s));
+}
+
+static inline uint64_t  //
+wuffs_base__range_ie_u64__length(const wuffs_base__range_ie_u64* r) {
+  return wuffs_base__u64__sat_sub(r->max_excl, r->min_incl);
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__range_ie_u64::is_empty() const {
+  return wuffs_base__range_ie_u64__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__range_ie_u64::equals(wuffs_base__range_ie_u64 s) const {
+  return wuffs_base__range_ie_u64__equals(this, s);
+}
+
+inline wuffs_base__range_ie_u64  //
+wuffs_base__range_ie_u64::intersect(wuffs_base__range_ie_u64 s) const {
+  return wuffs_base__range_ie_u64__intersect(this, s);
+}
+
+inline wuffs_base__range_ie_u64  //
+wuffs_base__range_ie_u64::unite(wuffs_base__range_ie_u64 s) const {
+  return wuffs_base__range_ie_u64__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__range_ie_u64::contains(uint64_t x) const {
+  return wuffs_base__range_ie_u64__contains(this, x);
+}
+
+inline bool  //
+wuffs_base__range_ie_u64::contains_range(wuffs_base__range_ie_u64 s) const {
+  return wuffs_base__range_ie_u64__contains_range(this, s);
+}
+
+inline uint64_t  //
+wuffs_base__range_ie_u64::length() const {
+  return wuffs_base__range_ie_u64__length(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__rect_ii_u32__struct {
+  uint32_t min_incl_x;
+  uint32_t min_incl_y;
+  uint32_t max_incl_x;
+  uint32_t max_incl_y;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__rect_ii_u32__struct s) const;
+  inline wuffs_base__rect_ii_u32__struct intersect(
+      wuffs_base__rect_ii_u32__struct s) const;
+  inline wuffs_base__rect_ii_u32__struct unite(
+      wuffs_base__rect_ii_u32__struct s) const;
+  inline bool contains(uint32_t x, uint32_t y) const;
+  inline bool contains_rect(wuffs_base__rect_ii_u32__struct s) const;
+#endif  // __cplusplus
+
+} wuffs_base__rect_ii_u32;
+
+static inline wuffs_base__rect_ii_u32  //
+wuffs_base__empty_rect_ii_u32() {
+  wuffs_base__rect_ii_u32 ret;
+  ret.min_incl_x = 0;
+  ret.min_incl_y = 0;
+  ret.max_incl_x = 0;
+  ret.max_incl_y = 0;
+  return ret;
+}
+
+static inline wuffs_base__rect_ii_u32  //
+wuffs_base__make_rect_ii_u32(uint32_t min_incl_x,
+                             uint32_t min_incl_y,
+                             uint32_t max_incl_x,
+                             uint32_t max_incl_y) {
+  wuffs_base__rect_ii_u32 ret;
+  ret.min_incl_x = min_incl_x;
+  ret.min_incl_y = min_incl_y;
+  ret.max_incl_x = max_incl_x;
+  ret.max_incl_y = max_incl_y;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__rect_ii_u32__is_empty(const wuffs_base__rect_ii_u32* r) {
+  return (r->min_incl_x > r->max_incl_x) || (r->min_incl_y > r->max_incl_y);
+}
+
+static inline bool  //
+wuffs_base__rect_ii_u32__equals(const wuffs_base__rect_ii_u32* r,
+                                wuffs_base__rect_ii_u32 s) {
+  return (r->min_incl_x == s.min_incl_x && r->min_incl_y == s.min_incl_y &&
+          r->max_incl_x == s.max_incl_x && r->max_incl_y == s.max_incl_y) ||
+         (wuffs_base__rect_ii_u32__is_empty(r) &&
+          wuffs_base__rect_ii_u32__is_empty(&s));
+}
+
+static inline wuffs_base__rect_ii_u32  //
+wuffs_base__rect_ii_u32__intersect(const wuffs_base__rect_ii_u32* r,
+                                   wuffs_base__rect_ii_u32 s) {
+  wuffs_base__rect_ii_u32 t;
+  t.min_incl_x = wuffs_base__u32__max(r->min_incl_x, s.min_incl_x);
+  t.min_incl_y = wuffs_base__u32__max(r->min_incl_y, s.min_incl_y);
+  t.max_incl_x = wuffs_base__u32__min(r->max_incl_x, s.max_incl_x);
+  t.max_incl_y = wuffs_base__u32__min(r->max_incl_y, s.max_incl_y);
+  return t;
+}
+
+static inline wuffs_base__rect_ii_u32  //
+wuffs_base__rect_ii_u32__unite(const wuffs_base__rect_ii_u32* r,
+                               wuffs_base__rect_ii_u32 s) {
+  if (wuffs_base__rect_ii_u32__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__rect_ii_u32__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__rect_ii_u32 t;
+  t.min_incl_x = wuffs_base__u32__min(r->min_incl_x, s.min_incl_x);
+  t.min_incl_y = wuffs_base__u32__min(r->min_incl_y, s.min_incl_y);
+  t.max_incl_x = wuffs_base__u32__max(r->max_incl_x, s.max_incl_x);
+  t.max_incl_y = wuffs_base__u32__max(r->max_incl_y, s.max_incl_y);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__rect_ii_u32__contains(const wuffs_base__rect_ii_u32* r,
+                                  uint32_t x,
+                                  uint32_t y) {
+  return (r->min_incl_x <= x) && (x <= r->max_incl_x) && (r->min_incl_y <= y) &&
+         (y <= r->max_incl_y);
+}
+
+static inline bool  //
+wuffs_base__rect_ii_u32__contains_rect(const wuffs_base__rect_ii_u32* r,
+                                       wuffs_base__rect_ii_u32 s) {
+  return wuffs_base__rect_ii_u32__equals(
+      &s, wuffs_base__rect_ii_u32__intersect(r, s));
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__rect_ii_u32::is_empty() const {
+  return wuffs_base__rect_ii_u32__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__rect_ii_u32::equals(wuffs_base__rect_ii_u32 s) const {
+  return wuffs_base__rect_ii_u32__equals(this, s);
+}
+
+inline wuffs_base__rect_ii_u32  //
+wuffs_base__rect_ii_u32::intersect(wuffs_base__rect_ii_u32 s) const {
+  return wuffs_base__rect_ii_u32__intersect(this, s);
+}
+
+inline wuffs_base__rect_ii_u32  //
+wuffs_base__rect_ii_u32::unite(wuffs_base__rect_ii_u32 s) const {
+  return wuffs_base__rect_ii_u32__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__rect_ii_u32::contains(uint32_t x, uint32_t y) const {
+  return wuffs_base__rect_ii_u32__contains(this, x, y);
+}
+
+inline bool  //
+wuffs_base__rect_ii_u32::contains_rect(wuffs_base__rect_ii_u32 s) const {
+  return wuffs_base__rect_ii_u32__contains_rect(this, s);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__rect_ie_u32__struct {
+  uint32_t min_incl_x;
+  uint32_t min_incl_y;
+  uint32_t max_excl_x;
+  uint32_t max_excl_y;
+
+#ifdef __cplusplus
+  inline bool is_empty() const;
+  inline bool equals(wuffs_base__rect_ie_u32__struct s) const;
+  inline wuffs_base__rect_ie_u32__struct intersect(
+      wuffs_base__rect_ie_u32__struct s) const;
+  inline wuffs_base__rect_ie_u32__struct unite(
+      wuffs_base__rect_ie_u32__struct s) const;
+  inline bool contains(uint32_t x, uint32_t y) const;
+  inline bool contains_rect(wuffs_base__rect_ie_u32__struct s) const;
+  inline uint32_t width() const;
+  inline uint32_t height() const;
+#endif  // __cplusplus
+
+} wuffs_base__rect_ie_u32;
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__empty_rect_ie_u32() {
+  wuffs_base__rect_ie_u32 ret;
+  ret.min_incl_x = 0;
+  ret.min_incl_y = 0;
+  ret.max_excl_x = 0;
+  ret.max_excl_y = 0;
+  return ret;
+}
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__make_rect_ie_u32(uint32_t min_incl_x,
+                             uint32_t min_incl_y,
+                             uint32_t max_excl_x,
+                             uint32_t max_excl_y) {
+  wuffs_base__rect_ie_u32 ret;
+  ret.min_incl_x = min_incl_x;
+  ret.min_incl_y = min_incl_y;
+  ret.max_excl_x = max_excl_x;
+  ret.max_excl_y = max_excl_y;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__rect_ie_u32__is_empty(const wuffs_base__rect_ie_u32* r) {
+  return (r->min_incl_x >= r->max_excl_x) || (r->min_incl_y >= r->max_excl_y);
+}
+
+static inline bool  //
+wuffs_base__rect_ie_u32__equals(const wuffs_base__rect_ie_u32* r,
+                                wuffs_base__rect_ie_u32 s) {
+  return (r->min_incl_x == s.min_incl_x && r->min_incl_y == s.min_incl_y &&
+          r->max_excl_x == s.max_excl_x && r->max_excl_y == s.max_excl_y) ||
+         (wuffs_base__rect_ie_u32__is_empty(r) &&
+          wuffs_base__rect_ie_u32__is_empty(&s));
+}
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__rect_ie_u32__intersect(const wuffs_base__rect_ie_u32* r,
+                                   wuffs_base__rect_ie_u32 s) {
+  wuffs_base__rect_ie_u32 t;
+  t.min_incl_x = wuffs_base__u32__max(r->min_incl_x, s.min_incl_x);
+  t.min_incl_y = wuffs_base__u32__max(r->min_incl_y, s.min_incl_y);
+  t.max_excl_x = wuffs_base__u32__min(r->max_excl_x, s.max_excl_x);
+  t.max_excl_y = wuffs_base__u32__min(r->max_excl_y, s.max_excl_y);
+  return t;
+}
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__rect_ie_u32__unite(const wuffs_base__rect_ie_u32* r,
+                               wuffs_base__rect_ie_u32 s) {
+  if (wuffs_base__rect_ie_u32__is_empty(r)) {
+    return s;
+  }
+  if (wuffs_base__rect_ie_u32__is_empty(&s)) {
+    return *r;
+  }
+  wuffs_base__rect_ie_u32 t;
+  t.min_incl_x = wuffs_base__u32__min(r->min_incl_x, s.min_incl_x);
+  t.min_incl_y = wuffs_base__u32__min(r->min_incl_y, s.min_incl_y);
+  t.max_excl_x = wuffs_base__u32__max(r->max_excl_x, s.max_excl_x);
+  t.max_excl_y = wuffs_base__u32__max(r->max_excl_y, s.max_excl_y);
+  return t;
+}
+
+static inline bool  //
+wuffs_base__rect_ie_u32__contains(const wuffs_base__rect_ie_u32* r,
+                                  uint32_t x,
+                                  uint32_t y) {
+  return (r->min_incl_x <= x) && (x < r->max_excl_x) && (r->min_incl_y <= y) &&
+         (y < r->max_excl_y);
+}
+
+static inline bool  //
+wuffs_base__rect_ie_u32__contains_rect(const wuffs_base__rect_ie_u32* r,
+                                       wuffs_base__rect_ie_u32 s) {
+  return wuffs_base__rect_ie_u32__equals(
+      &s, wuffs_base__rect_ie_u32__intersect(r, s));
+}
+
+static inline uint32_t  //
+wuffs_base__rect_ie_u32__width(const wuffs_base__rect_ie_u32* r) {
+  return wuffs_base__u32__sat_sub(r->max_excl_x, r->min_incl_x);
+}
+
+static inline uint32_t  //
+wuffs_base__rect_ie_u32__height(const wuffs_base__rect_ie_u32* r) {
+  return wuffs_base__u32__sat_sub(r->max_excl_y, r->min_incl_y);
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__rect_ie_u32::is_empty() const {
+  return wuffs_base__rect_ie_u32__is_empty(this);
+}
+
+inline bool  //
+wuffs_base__rect_ie_u32::equals(wuffs_base__rect_ie_u32 s) const {
+  return wuffs_base__rect_ie_u32__equals(this, s);
+}
+
+inline wuffs_base__rect_ie_u32  //
+wuffs_base__rect_ie_u32::intersect(wuffs_base__rect_ie_u32 s) const {
+  return wuffs_base__rect_ie_u32__intersect(this, s);
+}
+
+inline wuffs_base__rect_ie_u32  //
+wuffs_base__rect_ie_u32::unite(wuffs_base__rect_ie_u32 s) const {
+  return wuffs_base__rect_ie_u32__unite(this, s);
+}
+
+inline bool  //
+wuffs_base__rect_ie_u32::contains(uint32_t x, uint32_t y) const {
+  return wuffs_base__rect_ie_u32__contains(this, x, y);
+}
+
+inline bool  //
+wuffs_base__rect_ie_u32::contains_rect(wuffs_base__rect_ie_u32 s) const {
+  return wuffs_base__rect_ie_u32__contains_rect(this, s);
+}
+
+inline uint32_t  //
+wuffs_base__rect_ie_u32::width() const {
+  return wuffs_base__rect_ie_u32__width(this);
+}
+
+inline uint32_t  //
+wuffs_base__rect_ie_u32::height() const {
+  return wuffs_base__rect_ie_u32__height(this);
+}
+
+#endif  // __cplusplus
+
+// ---------------- More Information
+
+// wuffs_base__more_information holds additional fields, typically when a Wuffs
+// method returns a [note status](/doc/note/statuses.md).
+//
+// The flavor field follows the base38 namespace
+// convention](/doc/note/base38-and-fourcc.md). The other fields' semantics
+// depends on the flavor.
+typedef struct wuffs_base__more_information__struct {
+  uint32_t flavor;
+  uint32_t w;
+  uint64_t x;
+  uint64_t y;
+  uint64_t z;
+
+#ifdef __cplusplus
+  inline void set(uint32_t flavor_arg,
+                  uint32_t w_arg,
+                  uint64_t x_arg,
+                  uint64_t y_arg,
+                  uint64_t z_arg);
+  inline uint32_t io_redirect__fourcc() const;
+  inline wuffs_base__range_ie_u64 io_redirect__range() const;
+  inline uint64_t io_seek__position() const;
+  inline uint32_t metadata__fourcc() const;
+  // Deprecated: use metadata_raw_passthrough__range.
+  inline wuffs_base__range_ie_u64 metadata__range() const;
+  inline wuffs_base__range_ie_u64 metadata_raw_passthrough__range() const;
+  inline int32_t metadata_parsed__chrm(uint32_t component) const;
+  inline uint32_t metadata_parsed__gama() const;
+  inline uint32_t metadata_parsed__srgb() const;
+#endif  // __cplusplus
+
+} wuffs_base__more_information;
+
+#define WUFFS_BASE__MORE_INFORMATION__FLAVOR__IO_REDIRECT 1
+#define WUFFS_BASE__MORE_INFORMATION__FLAVOR__IO_SEEK 2
+// Deprecated: use
+// WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_PASSTHROUGH.
+#define WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA 3
+#define WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_PASSTHROUGH 3
+#define WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_TRANSFORM 4
+#define WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_PARSED 5
+
+static inline wuffs_base__more_information  //
+wuffs_base__empty_more_information() {
+  wuffs_base__more_information ret;
+  ret.flavor = 0;
+  ret.w = 0;
+  ret.x = 0;
+  ret.y = 0;
+  ret.z = 0;
+  return ret;
+}
+
+static inline void  //
+wuffs_base__more_information__set(wuffs_base__more_information* m,
+                                  uint32_t flavor,
+                                  uint32_t w,
+                                  uint64_t x,
+                                  uint64_t y,
+                                  uint64_t z) {
+  if (!m) {
+    return;
+  }
+  m->flavor = flavor;
+  m->w = w;
+  m->x = x;
+  m->y = y;
+  m->z = z;
+}
+
+static inline uint32_t  //
+wuffs_base__more_information__io_redirect__fourcc(
+    const wuffs_base__more_information* m) {
+  return m->w;
+}
+
+static inline wuffs_base__range_ie_u64  //
+wuffs_base__more_information__io_redirect__range(
+    const wuffs_base__more_information* m) {
+  wuffs_base__range_ie_u64 ret;
+  ret.min_incl = m->y;
+  ret.max_excl = m->z;
+  return ret;
+}
+
+static inline uint64_t  //
+wuffs_base__more_information__io_seek__position(
+    const wuffs_base__more_information* m) {
+  return m->x;
+}
+
+static inline uint32_t  //
+wuffs_base__more_information__metadata__fourcc(
+    const wuffs_base__more_information* m) {
+  return m->w;
+}
+
+// Deprecated: use
+// wuffs_base__more_information__metadata_raw_passthrough__range.
+static inline wuffs_base__range_ie_u64  //
+wuffs_base__more_information__metadata__range(
+    const wuffs_base__more_information* m) {
+  wuffs_base__range_ie_u64 ret;
+  ret.min_incl = m->y;
+  ret.max_excl = m->z;
+  return ret;
+}
+
+static inline wuffs_base__range_ie_u64  //
+wuffs_base__more_information__metadata_raw_passthrough__range(
+    const wuffs_base__more_information* m) {
+  wuffs_base__range_ie_u64 ret;
+  ret.min_incl = m->y;
+  ret.max_excl = m->z;
+  return ret;
+}
+
+#define WUFFS_BASE__MORE_INFORMATION__METADATA_PARSED__CHRM__WHITE_X 0
+#define WUFFS_BASE__MORE_INFORMATION__METADATA_PARSED__CHRM__WHITE_Y 1
+#define WUFFS_BASE__MORE_INFORMATION__METADATA_PARSED__CHRM__RED_X 2
+#define WUFFS_BASE__MORE_INFORMATION__METADATA_PARSED__CHRM__RED_Y 3
+#define WUFFS_BASE__MORE_INFORMATION__METADATA_PARSED__CHRM__GREEN_X 4
+#define WUFFS_BASE__MORE_INFORMATION__METADATA_PARSED__CHRM__GREEN_Y 5
+#define WUFFS_BASE__MORE_INFORMATION__METADATA_PARSED__CHRM__BLUE_X 6
+#define WUFFS_BASE__MORE_INFORMATION__METADATA_PARSED__CHRM__BLUE_Y 7
+
+// wuffs_base__more_information__metadata_parsed__chrm returns chromaticity
+// values (scaled by 100000) like the PNG "cHRM" chunk. For example, the sRGB
+// color space corresponds to:
+//  - ETC__CHRM__WHITE_X 31270
+//  - ETC__CHRM__WHITE_Y 32900
+//  - ETC__CHRM__RED_X   64000
+//  - ETC__CHRM__RED_Y   33000
+//  - ETC__CHRM__GREEN_X 30000
+//  - ETC__CHRM__GREEN_Y 60000
+//  - ETC__CHRM__BLUE_X  15000
+//  - ETC__CHRM__BLUE_Y   6000
+//
+// See
+// https://ciechanow.ski/color-spaces/#chromaticity-and-white-point-coordinates
+static inline int32_t  //
+wuffs_base__more_information__metadata_parsed__chrm(
+    const wuffs_base__more_information* m,
+    uint32_t component) {
+  // After the flavor and the w field (holding a FourCC), a
+  // wuffs_base__more_information holds 24 bytes of data in three uint64_t
+  // typed fields (x, y and z). We pack the eight chromaticity values (wx, wy,
+  // rx, ..., by), basically int24_t values, into 24 bytes like this:
+  //  -    LSB                 MSB
+  //  - x: wx wx wx wy wy wy rx rx
+  //  - y: rx ry ry ry gx gx gx gy
+  //  - z: gy gy bx bx bx by by by
+  uint32_t u = 0;
+  switch (component & 7) {
+    case 0:
+      u = ((uint32_t)(m->x >> 0));
+      break;
+    case 1:
+      u = ((uint32_t)(m->x >> 24));
+      break;
+    case 2:
+      u = ((uint32_t)((m->x >> 48) | (m->y << 16)));
+      break;
+    case 3:
+      u = ((uint32_t)(m->y >> 8));
+      break;
+    case 4:
+      u = ((uint32_t)(m->y >> 32));
+      break;
+    case 5:
+      u = ((uint32_t)((m->y >> 56) | (m->z << 8)));
+      break;
+    case 6:
+      u = ((uint32_t)(m->z >> 16));
+      break;
+    case 7:
+      u = ((uint32_t)(m->z >> 40));
+      break;
+  }
+  // The left-right shifts sign-extend from 24-bit to 32-bit integers.
+  return ((int32_t)(u << 8)) >> 8;
+}
+
+// wuffs_base__more_information__metadata_parsed__gama returns inverse gamma
+// correction values (scaled by 100000) like the PNG "gAMA" chunk. For example,
+// for gamma = 2.2, this returns 45455 (approximating 100000 / 2.2).
+static inline uint32_t  //
+wuffs_base__more_information__metadata_parsed__gama(
+    const wuffs_base__more_information* m) {
+  return ((uint32_t)(m->x));
+}
+
+#define WUFFS_BASE__SRGB_RENDERING_INTENT__PERCEPTUAL 0
+#define WUFFS_BASE__SRGB_RENDERING_INTENT__RELATIVE_COLORIMETRIC 1
+#define WUFFS_BASE__SRGB_RENDERING_INTENT__SATURATION 2
+#define WUFFS_BASE__SRGB_RENDERING_INTENT__ABSOLUTE_COLORIMETRIC 3
+
+// wuffs_base__more_information__metadata_parsed__srgb returns the sRGB
+// rendering intent like the PNG "sRGB" chunk.
+static inline uint32_t  //
+wuffs_base__more_information__metadata_parsed__srgb(
+    const wuffs_base__more_information* m) {
+  return m->x & 3;
+}
+
+#ifdef __cplusplus
+
+inline void  //
+wuffs_base__more_information::set(uint32_t flavor_arg,
+                                  uint32_t w_arg,
+                                  uint64_t x_arg,
+                                  uint64_t y_arg,
+                                  uint64_t z_arg) {
+  wuffs_base__more_information__set(this, flavor_arg, w_arg, x_arg, y_arg,
+                                    z_arg);
+}
+
+inline uint32_t  //
+wuffs_base__more_information::io_redirect__fourcc() const {
+  return wuffs_base__more_information__io_redirect__fourcc(this);
+}
+
+inline wuffs_base__range_ie_u64  //
+wuffs_base__more_information::io_redirect__range() const {
+  return wuffs_base__more_information__io_redirect__range(this);
+}
+
+inline uint64_t  //
+wuffs_base__more_information::io_seek__position() const {
+  return wuffs_base__more_information__io_seek__position(this);
+}
+
+inline uint32_t  //
+wuffs_base__more_information::metadata__fourcc() const {
+  return wuffs_base__more_information__metadata__fourcc(this);
+}
+
+inline wuffs_base__range_ie_u64  //
+wuffs_base__more_information::metadata__range() const {
+  return wuffs_base__more_information__metadata__range(this);
+}
+
+inline wuffs_base__range_ie_u64  //
+wuffs_base__more_information::metadata_raw_passthrough__range() const {
+  return wuffs_base__more_information__metadata_raw_passthrough__range(this);
+}
+
+inline int32_t  //
+wuffs_base__more_information::metadata_parsed__chrm(uint32_t component) const {
+  return wuffs_base__more_information__metadata_parsed__chrm(this, component);
+}
+
+inline uint32_t  //
+wuffs_base__more_information::metadata_parsed__gama() const {
+  return wuffs_base__more_information__metadata_parsed__gama(this);
+}
+
+inline uint32_t  //
+wuffs_base__more_information::metadata_parsed__srgb() const {
+  return wuffs_base__more_information__metadata_parsed__srgb(this);
+}
+
+#endif  // __cplusplus
+
+// ---------------- I/O
+//
+// See (/doc/note/io-input-output.md).
+
+// wuffs_base__io_buffer_meta is the metadata for a wuffs_base__io_buffer's
+// data.
+typedef struct wuffs_base__io_buffer_meta__struct {
+  size_t wi;     // Write index. Invariant: wi <= len.
+  size_t ri;     // Read  index. Invariant: ri <= wi.
+  uint64_t pos;  // Buffer position (relative to the start of stream).
+  bool closed;   // No further writes are expected.
+} wuffs_base__io_buffer_meta;
+
+// wuffs_base__io_buffer is a 1-dimensional buffer (a pointer and length) plus
+// additional metadata.
+//
+// A value with all fields zero is a valid, empty buffer.
+typedef struct wuffs_base__io_buffer__struct {
+  wuffs_base__slice_u8 data;
+  wuffs_base__io_buffer_meta meta;
+
+#ifdef __cplusplus
+  inline bool is_valid() const;
+  inline void compact();
+  inline size_t reader_length() const;
+  inline uint8_t* reader_pointer() const;
+  inline uint64_t reader_position() const;
+  inline wuffs_base__slice_u8 reader_slice() const;
+  inline size_t writer_length() const;
+  inline uint8_t* writer_pointer() const;
+  inline uint64_t writer_position() const;
+  inline wuffs_base__slice_u8 writer_slice() const;
+
+  // Deprecated: use reader_position.
+  inline uint64_t reader_io_position() const;
+  // Deprecated: use writer_position.
+  inline uint64_t writer_io_position() const;
+#endif  // __cplusplus
+
+} wuffs_base__io_buffer;
+
+static inline wuffs_base__io_buffer  //
+wuffs_base__make_io_buffer(wuffs_base__slice_u8 data,
+                           wuffs_base__io_buffer_meta meta) {
+  wuffs_base__io_buffer ret;
+  ret.data = data;
+  ret.meta = meta;
+  return ret;
+}
+
+static inline wuffs_base__io_buffer_meta  //
+wuffs_base__make_io_buffer_meta(size_t wi,
+                                size_t ri,
+                                uint64_t pos,
+                                bool closed) {
+  wuffs_base__io_buffer_meta ret;
+  ret.wi = wi;
+  ret.ri = ri;
+  ret.pos = pos;
+  ret.closed = closed;
+  return ret;
+}
+
+static inline wuffs_base__io_buffer  //
+wuffs_base__ptr_u8__reader(uint8_t* ptr, size_t len, bool closed) {
+  wuffs_base__io_buffer ret;
+  ret.data.ptr = ptr;
+  ret.data.len = len;
+  ret.meta.wi = len;
+  ret.meta.ri = 0;
+  ret.meta.pos = 0;
+  ret.meta.closed = closed;
+  return ret;
+}
+
+static inline wuffs_base__io_buffer  //
+wuffs_base__ptr_u8__writer(uint8_t* ptr, size_t len) {
+  wuffs_base__io_buffer ret;
+  ret.data.ptr = ptr;
+  ret.data.len = len;
+  ret.meta.wi = 0;
+  ret.meta.ri = 0;
+  ret.meta.pos = 0;
+  ret.meta.closed = false;
+  return ret;
+}
+
+static inline wuffs_base__io_buffer  //
+wuffs_base__slice_u8__reader(wuffs_base__slice_u8 s, bool closed) {
+  wuffs_base__io_buffer ret;
+  ret.data.ptr = s.ptr;
+  ret.data.len = s.len;
+  ret.meta.wi = s.len;
+  ret.meta.ri = 0;
+  ret.meta.pos = 0;
+  ret.meta.closed = closed;
+  return ret;
+}
+
+static inline wuffs_base__io_buffer  //
+wuffs_base__slice_u8__writer(wuffs_base__slice_u8 s) {
+  wuffs_base__io_buffer ret;
+  ret.data.ptr = s.ptr;
+  ret.data.len = s.len;
+  ret.meta.wi = 0;
+  ret.meta.ri = 0;
+  ret.meta.pos = 0;
+  ret.meta.closed = false;
+  return ret;
+}
+
+static inline wuffs_base__io_buffer  //
+wuffs_base__empty_io_buffer() {
+  wuffs_base__io_buffer ret;
+  ret.data.ptr = NULL;
+  ret.data.len = 0;
+  ret.meta.wi = 0;
+  ret.meta.ri = 0;
+  ret.meta.pos = 0;
+  ret.meta.closed = false;
+  return ret;
+}
+
+static inline wuffs_base__io_buffer_meta  //
+wuffs_base__empty_io_buffer_meta() {
+  wuffs_base__io_buffer_meta ret;
+  ret.wi = 0;
+  ret.ri = 0;
+  ret.pos = 0;
+  ret.closed = false;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__io_buffer__is_valid(const wuffs_base__io_buffer* buf) {
+  if (buf) {
+    if (buf->data.ptr) {
+      return (buf->meta.ri <= buf->meta.wi) && (buf->meta.wi <= buf->data.len);
+    } else {
+      return (buf->meta.ri == 0) && (buf->meta.wi == 0) && (buf->data.len == 0);
+    }
+  }
+  return false;
+}
+
+// wuffs_base__io_buffer__compact moves any written but unread bytes to the
+// start of the buffer.
+static inline void  //
+wuffs_base__io_buffer__compact(wuffs_base__io_buffer* buf) {
+  if (!buf || (buf->meta.ri == 0)) {
+    return;
+  }
+  buf->meta.pos = wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri);
+  size_t n = buf->meta.wi - buf->meta.ri;
+  if (n != 0) {
+    memmove(buf->data.ptr, buf->data.ptr + buf->meta.ri, n);
+  }
+  buf->meta.wi = n;
+  buf->meta.ri = 0;
+}
+
+// Deprecated. Use wuffs_base__io_buffer__reader_position.
+static inline uint64_t  //
+wuffs_base__io_buffer__reader_io_position(const wuffs_base__io_buffer* buf) {
+  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri) : 0;
+}
+
+static inline size_t  //
+wuffs_base__io_buffer__reader_length(const wuffs_base__io_buffer* buf) {
+  return buf ? buf->meta.wi - buf->meta.ri : 0;
+}
+
+static inline uint8_t*  //
+wuffs_base__io_buffer__reader_pointer(const wuffs_base__io_buffer* buf) {
+  return buf ? (buf->data.ptr + buf->meta.ri) : NULL;
+}
+
+static inline uint64_t  //
+wuffs_base__io_buffer__reader_position(const wuffs_base__io_buffer* buf) {
+  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri) : 0;
+}
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__io_buffer__reader_slice(const wuffs_base__io_buffer* buf) {
+  return buf ? wuffs_base__make_slice_u8(buf->data.ptr + buf->meta.ri,
+                                         buf->meta.wi - buf->meta.ri)
+             : wuffs_base__empty_slice_u8();
+}
+
+// Deprecated. Use wuffs_base__io_buffer__writer_position.
+static inline uint64_t  //
+wuffs_base__io_buffer__writer_io_position(const wuffs_base__io_buffer* buf) {
+  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.wi) : 0;
+}
+
+static inline size_t  //
+wuffs_base__io_buffer__writer_length(const wuffs_base__io_buffer* buf) {
+  return buf ? buf->data.len - buf->meta.wi : 0;
+}
+
+static inline uint8_t*  //
+wuffs_base__io_buffer__writer_pointer(const wuffs_base__io_buffer* buf) {
+  return buf ? (buf->data.ptr + buf->meta.wi) : NULL;
+}
+
+static inline uint64_t  //
+wuffs_base__io_buffer__writer_position(const wuffs_base__io_buffer* buf) {
+  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.wi) : 0;
+}
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__io_buffer__writer_slice(const wuffs_base__io_buffer* buf) {
+  return buf ? wuffs_base__make_slice_u8(buf->data.ptr + buf->meta.wi,
+                                         buf->data.len - buf->meta.wi)
+             : wuffs_base__empty_slice_u8();
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__io_buffer::is_valid() const {
+  return wuffs_base__io_buffer__is_valid(this);
+}
+
+inline void  //
+wuffs_base__io_buffer::compact() {
+  wuffs_base__io_buffer__compact(this);
+}
+
+inline uint64_t  //
+wuffs_base__io_buffer::reader_io_position() const {
+  return wuffs_base__io_buffer__reader_io_position(this);
+}
+
+inline size_t  //
+wuffs_base__io_buffer::reader_length() const {
+  return wuffs_base__io_buffer__reader_length(this);
+}
+
+inline uint8_t*  //
+wuffs_base__io_buffer::reader_pointer() const {
+  return wuffs_base__io_buffer__reader_pointer(this);
+}
+
+inline uint64_t  //
+wuffs_base__io_buffer::reader_position() const {
+  return wuffs_base__io_buffer__reader_position(this);
+}
+
+inline wuffs_base__slice_u8  //
+wuffs_base__io_buffer::reader_slice() const {
+  return wuffs_base__io_buffer__reader_slice(this);
+}
+
+inline uint64_t  //
+wuffs_base__io_buffer::writer_io_position() const {
+  return wuffs_base__io_buffer__writer_io_position(this);
+}
+
+inline size_t  //
+wuffs_base__io_buffer::writer_length() const {
+  return wuffs_base__io_buffer__writer_length(this);
+}
+
+inline uint8_t*  //
+wuffs_base__io_buffer::writer_pointer() const {
+  return wuffs_base__io_buffer__writer_pointer(this);
+}
+
+inline uint64_t  //
+wuffs_base__io_buffer::writer_position() const {
+  return wuffs_base__io_buffer__writer_position(this);
+}
+
+inline wuffs_base__slice_u8  //
+wuffs_base__io_buffer::writer_slice() const {
+  return wuffs_base__io_buffer__writer_slice(this);
+}
+
+#endif  // __cplusplus
+
+// ---------------- Tokens
+
+// wuffs_base__token is an element of a byte stream's tokenization.
+//
+// See https://github.com/google/wuffs/blob/main/doc/note/tokens.md
+typedef struct wuffs_base__token__struct {
+  uint64_t repr;
+
+#ifdef __cplusplus
+  inline int64_t value() const;
+  inline int64_t value_extension() const;
+  inline int64_t value_major() const;
+  inline int64_t value_base_category() const;
+  inline uint64_t value_minor() const;
+  inline uint64_t value_base_detail() const;
+  inline int64_t value_base_detail__sign_extended() const;
+  inline bool continued() const;
+  inline uint64_t length() const;
+#endif  // __cplusplus
+
+} wuffs_base__token;
+
+static inline wuffs_base__token  //
+wuffs_base__make_token(uint64_t repr) {
+  wuffs_base__token ret;
+  ret.repr = repr;
+  return ret;
+}
+
+// --------
+
+#define WUFFS_BASE__TOKEN__LENGTH__MAX_INCL 0xFFFF
+
+#define WUFFS_BASE__TOKEN__VALUE__SHIFT 17
+#define WUFFS_BASE__TOKEN__VALUE_EXTENSION__SHIFT 17
+#define WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT 42
+#define WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT 17
+#define WUFFS_BASE__TOKEN__VALUE_BASE_CATEGORY__SHIFT 38
+#define WUFFS_BASE__TOKEN__VALUE_BASE_DETAIL__SHIFT 17
+#define WUFFS_BASE__TOKEN__CONTINUED__SHIFT 16
+#define WUFFS_BASE__TOKEN__LENGTH__SHIFT 0
+
+#define WUFFS_BASE__TOKEN__VALUE_EXTENSION__NUM_BITS 46
+
+// --------
+
+#define WUFFS_BASE__TOKEN__VBC__FILLER 0
+#define WUFFS_BASE__TOKEN__VBC__STRUCTURE 1
+#define WUFFS_BASE__TOKEN__VBC__STRING 2
+#define WUFFS_BASE__TOKEN__VBC__UNICODE_CODE_POINT 3
+#define WUFFS_BASE__TOKEN__VBC__LITERAL 4
+#define WUFFS_BASE__TOKEN__VBC__NUMBER 5
+#define WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_SIGNED 6
+#define WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_UNSIGNED 7
+
+// --------
+
+#define WUFFS_BASE__TOKEN__VBD__FILLER__PUNCTUATION 0x00001
+#define WUFFS_BASE__TOKEN__VBD__FILLER__COMMENT_BLOCK 0x00002
+#define WUFFS_BASE__TOKEN__VBD__FILLER__COMMENT_LINE 0x00004
+
+// COMMENT_ANY is a bit-wise or of COMMENT_BLOCK AND COMMENT_LINE.
+#define WUFFS_BASE__TOKEN__VBD__FILLER__COMMENT_ANY 0x00006
+
+// --------
+
+#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH 0x00001
+#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__POP 0x00002
+#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_NONE 0x00010
+#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_LIST 0x00020
+#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_DICT 0x00040
+#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_NONE 0x01000
+#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_LIST 0x02000
+#define WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_DICT 0x04000
+
+// --------
+
+// DEFINITELY_FOO means that the destination bytes (and also the source bytes,
+// for 1_DST_1_SRC_COPY) are in the FOO format. Definitely means that the lack
+// of the bit means "maybe FOO". It does not necessarily mean "not FOO".
+//
+// CHAIN_ETC means that decoding the entire token chain forms a UTF-8 or ASCII
+// string, not just this current token. CHAIN_ETC_UTF_8 therefore distinguishes
+// Unicode (UTF-8) strings from byte strings. MUST means that the the token
+// producer (e.g. parser) must verify this. SHOULD means that the token
+// consumer (e.g. renderer) should verify this.
+//
+// When a CHAIN_ETC_UTF_8 bit is set, the parser must ensure that non-ASCII
+// code points (with multi-byte UTF-8 encodings) do not straddle token
+// boundaries. Checking UTF-8 validity can inspect each token separately.
+//
+// The lack of any particular bit is conservative: it is valid for all-ASCII
+// strings, in a single- or multi-token chain, to have none of these bits set.
+#define WUFFS_BASE__TOKEN__VBD__STRING__DEFINITELY_UTF_8 0x00001
+#define WUFFS_BASE__TOKEN__VBD__STRING__CHAIN_MUST_BE_UTF_8 0x00002
+#define WUFFS_BASE__TOKEN__VBD__STRING__CHAIN_SHOULD_BE_UTF_8 0x00004
+#define WUFFS_BASE__TOKEN__VBD__STRING__DEFINITELY_ASCII 0x00010
+#define WUFFS_BASE__TOKEN__VBD__STRING__CHAIN_MUST_BE_ASCII 0x00020
+#define WUFFS_BASE__TOKEN__VBD__STRING__CHAIN_SHOULD_BE_ASCII 0x00040
+
+// CONVERT_D_DST_S_SRC means that multiples of S source bytes (possibly padded)
+// produces multiples of D destination bytes. For example,
+// CONVERT_1_DST_4_SRC_BACKSLASH_X means a source like "\\x23\\x67\\xAB", where
+// 12 src bytes encode 3 dst bytes.
+//
+// Post-processing may further transform those D destination bytes (e.g. treat
+// "\\xFF" as the Unicode code point U+00FF instead of the byte 0xFF), but that
+// is out of scope of this VBD's semantics.
+//
+// When src is the empty string, multiple conversion algorithms are applicable
+// (so these bits are not necessarily mutually exclusive), all producing the
+// same empty dst string.
+#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_0_DST_1_SRC_DROP 0x00100
+#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_1_SRC_COPY 0x00200
+#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_2_SRC_HEXADECIMAL 0x00400
+#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_4_SRC_BACKSLASH_X 0x00800
+#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_3_DST_4_SRC_BASE_64_STD 0x01000
+#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_3_DST_4_SRC_BASE_64_URL 0x02000
+#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_4_DST_5_SRC_ASCII_85 0x04000
+#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_5_DST_8_SRC_BASE_32_HEX 0x08000
+#define WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_5_DST_8_SRC_BASE_32_STD 0x10000
+
+// --------
+
+#define WUFFS_BASE__TOKEN__VBD__LITERAL__UNDEFINED 0x00001
+#define WUFFS_BASE__TOKEN__VBD__LITERAL__NULL 0x00002
+#define WUFFS_BASE__TOKEN__VBD__LITERAL__FALSE 0x00004
+#define WUFFS_BASE__TOKEN__VBD__LITERAL__TRUE 0x00008
+
+// --------
+
+// For a source string of "123" or "0x9A", it is valid for a tokenizer to
+// return any combination of:
+//  - WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_FLOATING_POINT.
+//  - WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_INTEGER_SIGNED.
+//  - WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_INTEGER_UNSIGNED.
+//
+// For a source string of "+123" or "-0x9A", only the first two are valid.
+//
+// For a source string of "123.", only the first one is valid.
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_FLOATING_POINT 0x00001
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_INTEGER_SIGNED 0x00002
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_INTEGER_UNSIGNED 0x00004
+
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_NEG_INF 0x00010
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_POS_INF 0x00020
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_NEG_NAN 0x00040
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_POS_NAN 0x00080
+
+// The number 300 might be represented as "\x01\x2C", "\x2C\x01\x00\x00" or
+// "300", which are big-endian, little-endian or text. For binary formats, the
+// token length (after adjusting for FORMAT_IGNORE_ETC) discriminates
+// e.g. u16 little-endian vs u32 little-endian.
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_BINARY_BIG_ENDIAN 0x00100
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_BINARY_LITTLE_ENDIAN 0x00200
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_TEXT 0x00400
+
+#define WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_IGNORE_FIRST_BYTE 0x01000
+
+// --------
+
+// wuffs_base__token__value returns the token's high 46 bits, sign-extended. A
+// negative value means an extended token, non-negative means a simple token.
+static inline int64_t  //
+wuffs_base__token__value(const wuffs_base__token* t) {
+  return ((int64_t)(t->repr)) >> WUFFS_BASE__TOKEN__VALUE__SHIFT;
+}
+
+// wuffs_base__token__value_extension returns a negative value if the token was
+// not an extended token.
+static inline int64_t  //
+wuffs_base__token__value_extension(const wuffs_base__token* t) {
+  return (~(int64_t)(t->repr)) >> WUFFS_BASE__TOKEN__VALUE_EXTENSION__SHIFT;
+}
+
+// wuffs_base__token__value_major returns a negative value if the token was not
+// a simple token.
+static inline int64_t  //
+wuffs_base__token__value_major(const wuffs_base__token* t) {
+  return ((int64_t)(t->repr)) >> WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT;
+}
+
+// wuffs_base__token__value_base_category returns a negative value if the token
+// was not a simple token.
+static inline int64_t  //
+wuffs_base__token__value_base_category(const wuffs_base__token* t) {
+  return ((int64_t)(t->repr)) >> WUFFS_BASE__TOKEN__VALUE_BASE_CATEGORY__SHIFT;
+}
+
+static inline uint64_t  //
+wuffs_base__token__value_minor(const wuffs_base__token* t) {
+  return (t->repr >> WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) & 0x1FFFFFF;
+}
+
+static inline uint64_t  //
+wuffs_base__token__value_base_detail(const wuffs_base__token* t) {
+  return (t->repr >> WUFFS_BASE__TOKEN__VALUE_BASE_DETAIL__SHIFT) & 0x1FFFFF;
+}
+
+static inline int64_t  //
+wuffs_base__token__value_base_detail__sign_extended(
+    const wuffs_base__token* t) {
+  // The VBD is 21 bits in the middle of t->repr. Left shift the high (64 - 21
+  // - ETC__SHIFT) bits off, then right shift (sign-extending) back down.
+  uint64_t u = t->repr << (43 - WUFFS_BASE__TOKEN__VALUE_BASE_DETAIL__SHIFT);
+  return ((int64_t)u) >> 43;
+}
+
+static inline bool  //
+wuffs_base__token__continued(const wuffs_base__token* t) {
+  return t->repr & 0x10000;
+}
+
+static inline uint64_t  //
+wuffs_base__token__length(const wuffs_base__token* t) {
+  return (t->repr >> WUFFS_BASE__TOKEN__LENGTH__SHIFT) & 0xFFFF;
+}
+
+#ifdef __cplusplus
+
+inline int64_t  //
+wuffs_base__token::value() const {
+  return wuffs_base__token__value(this);
+}
+
+inline int64_t  //
+wuffs_base__token::value_extension() const {
+  return wuffs_base__token__value_extension(this);
+}
+
+inline int64_t  //
+wuffs_base__token::value_major() const {
+  return wuffs_base__token__value_major(this);
+}
+
+inline int64_t  //
+wuffs_base__token::value_base_category() const {
+  return wuffs_base__token__value_base_category(this);
+}
+
+inline uint64_t  //
+wuffs_base__token::value_minor() const {
+  return wuffs_base__token__value_minor(this);
+}
+
+inline uint64_t  //
+wuffs_base__token::value_base_detail() const {
+  return wuffs_base__token__value_base_detail(this);
+}
+
+inline int64_t  //
+wuffs_base__token::value_base_detail__sign_extended() const {
+  return wuffs_base__token__value_base_detail__sign_extended(this);
+}
+
+inline bool  //
+wuffs_base__token::continued() const {
+  return wuffs_base__token__continued(this);
+}
+
+inline uint64_t  //
+wuffs_base__token::length() const {
+  return wuffs_base__token__length(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef WUFFS_BASE__SLICE(wuffs_base__token) wuffs_base__slice_token;
+
+static inline wuffs_base__slice_token  //
+wuffs_base__make_slice_token(wuffs_base__token* ptr, size_t len) {
+  wuffs_base__slice_token ret;
+  ret.ptr = ptr;
+  ret.len = len;
+  return ret;
+}
+
+static inline wuffs_base__slice_token  //
+wuffs_base__empty_slice_token() {
+  wuffs_base__slice_token ret;
+  ret.ptr = NULL;
+  ret.len = 0;
+  return ret;
+}
+
+// --------
+
+// wuffs_base__token_buffer_meta is the metadata for a
+// wuffs_base__token_buffer's data.
+typedef struct wuffs_base__token_buffer_meta__struct {
+  size_t wi;     // Write index. Invariant: wi <= len.
+  size_t ri;     // Read  index. Invariant: ri <= wi.
+  uint64_t pos;  // Position of the buffer start relative to the stream start.
+  bool closed;   // No further writes are expected.
+} wuffs_base__token_buffer_meta;
+
+// wuffs_base__token_buffer is a 1-dimensional buffer (a pointer and length)
+// plus additional metadata.
+//
+// A value with all fields zero is a valid, empty buffer.
+typedef struct wuffs_base__token_buffer__struct {
+  wuffs_base__slice_token data;
+  wuffs_base__token_buffer_meta meta;
+
+#ifdef __cplusplus
+  inline bool is_valid() const;
+  inline void compact();
+  inline uint64_t reader_length() const;
+  inline wuffs_base__token* reader_pointer() const;
+  inline wuffs_base__slice_token reader_slice() const;
+  inline uint64_t reader_token_position() const;
+  inline uint64_t writer_length() const;
+  inline uint64_t writer_token_position() const;
+  inline wuffs_base__token* writer_pointer() const;
+  inline wuffs_base__slice_token writer_slice() const;
+#endif  // __cplusplus
+
+} wuffs_base__token_buffer;
+
+static inline wuffs_base__token_buffer  //
+wuffs_base__make_token_buffer(wuffs_base__slice_token data,
+                              wuffs_base__token_buffer_meta meta) {
+  wuffs_base__token_buffer ret;
+  ret.data = data;
+  ret.meta = meta;
+  return ret;
+}
+
+static inline wuffs_base__token_buffer_meta  //
+wuffs_base__make_token_buffer_meta(size_t wi,
+                                   size_t ri,
+                                   uint64_t pos,
+                                   bool closed) {
+  wuffs_base__token_buffer_meta ret;
+  ret.wi = wi;
+  ret.ri = ri;
+  ret.pos = pos;
+  ret.closed = closed;
+  return ret;
+}
+
+static inline wuffs_base__token_buffer  //
+wuffs_base__slice_token__reader(wuffs_base__slice_token s, bool closed) {
+  wuffs_base__token_buffer ret;
+  ret.data.ptr = s.ptr;
+  ret.data.len = s.len;
+  ret.meta.wi = s.len;
+  ret.meta.ri = 0;
+  ret.meta.pos = 0;
+  ret.meta.closed = closed;
+  return ret;
+}
+
+static inline wuffs_base__token_buffer  //
+wuffs_base__slice_token__writer(wuffs_base__slice_token s) {
+  wuffs_base__token_buffer ret;
+  ret.data.ptr = s.ptr;
+  ret.data.len = s.len;
+  ret.meta.wi = 0;
+  ret.meta.ri = 0;
+  ret.meta.pos = 0;
+  ret.meta.closed = false;
+  return ret;
+}
+
+static inline wuffs_base__token_buffer  //
+wuffs_base__empty_token_buffer() {
+  wuffs_base__token_buffer ret;
+  ret.data.ptr = NULL;
+  ret.data.len = 0;
+  ret.meta.wi = 0;
+  ret.meta.ri = 0;
+  ret.meta.pos = 0;
+  ret.meta.closed = false;
+  return ret;
+}
+
+static inline wuffs_base__token_buffer_meta  //
+wuffs_base__empty_token_buffer_meta() {
+  wuffs_base__token_buffer_meta ret;
+  ret.wi = 0;
+  ret.ri = 0;
+  ret.pos = 0;
+  ret.closed = false;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__token_buffer__is_valid(const wuffs_base__token_buffer* buf) {
+  if (buf) {
+    if (buf->data.ptr) {
+      return (buf->meta.ri <= buf->meta.wi) && (buf->meta.wi <= buf->data.len);
+    } else {
+      return (buf->meta.ri == 0) && (buf->meta.wi == 0) && (buf->data.len == 0);
+    }
+  }
+  return false;
+}
+
+// wuffs_base__token_buffer__compact moves any written but unread tokens to the
+// start of the buffer.
+static inline void  //
+wuffs_base__token_buffer__compact(wuffs_base__token_buffer* buf) {
+  if (!buf || (buf->meta.ri == 0)) {
+    return;
+  }
+  buf->meta.pos = wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri);
+  size_t n = buf->meta.wi - buf->meta.ri;
+  if (n != 0) {
+    memmove(buf->data.ptr, buf->data.ptr + buf->meta.ri,
+            n * sizeof(wuffs_base__token));
+  }
+  buf->meta.wi = n;
+  buf->meta.ri = 0;
+}
+
+static inline uint64_t  //
+wuffs_base__token_buffer__reader_length(const wuffs_base__token_buffer* buf) {
+  return buf ? buf->meta.wi - buf->meta.ri : 0;
+}
+
+static inline wuffs_base__token*  //
+wuffs_base__token_buffer__reader_pointer(const wuffs_base__token_buffer* buf) {
+  return buf ? (buf->data.ptr + buf->meta.ri) : NULL;
+}
+
+static inline wuffs_base__slice_token  //
+wuffs_base__token_buffer__reader_slice(const wuffs_base__token_buffer* buf) {
+  return buf ? wuffs_base__make_slice_token(buf->data.ptr + buf->meta.ri,
+                                            buf->meta.wi - buf->meta.ri)
+             : wuffs_base__empty_slice_token();
+}
+
+static inline uint64_t  //
+wuffs_base__token_buffer__reader_token_position(
+    const wuffs_base__token_buffer* buf) {
+  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.ri) : 0;
+}
+
+static inline uint64_t  //
+wuffs_base__token_buffer__writer_length(const wuffs_base__token_buffer* buf) {
+  return buf ? buf->data.len - buf->meta.wi : 0;
+}
+
+static inline wuffs_base__token*  //
+wuffs_base__token_buffer__writer_pointer(const wuffs_base__token_buffer* buf) {
+  return buf ? (buf->data.ptr + buf->meta.wi) : NULL;
+}
+
+static inline wuffs_base__slice_token  //
+wuffs_base__token_buffer__writer_slice(const wuffs_base__token_buffer* buf) {
+  return buf ? wuffs_base__make_slice_token(buf->data.ptr + buf->meta.wi,
+                                            buf->data.len - buf->meta.wi)
+             : wuffs_base__empty_slice_token();
+}
+
+static inline uint64_t  //
+wuffs_base__token_buffer__writer_token_position(
+    const wuffs_base__token_buffer* buf) {
+  return buf ? wuffs_base__u64__sat_add(buf->meta.pos, buf->meta.wi) : 0;
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__token_buffer::is_valid() const {
+  return wuffs_base__token_buffer__is_valid(this);
+}
+
+inline void  //
+wuffs_base__token_buffer::compact() {
+  wuffs_base__token_buffer__compact(this);
+}
+
+inline uint64_t  //
+wuffs_base__token_buffer::reader_length() const {
+  return wuffs_base__token_buffer__reader_length(this);
+}
+
+inline wuffs_base__token*  //
+wuffs_base__token_buffer::reader_pointer() const {
+  return wuffs_base__token_buffer__reader_pointer(this);
+}
+
+inline wuffs_base__slice_token  //
+wuffs_base__token_buffer::reader_slice() const {
+  return wuffs_base__token_buffer__reader_slice(this);
+}
+
+inline uint64_t  //
+wuffs_base__token_buffer::reader_token_position() const {
+  return wuffs_base__token_buffer__reader_token_position(this);
+}
+
+inline uint64_t  //
+wuffs_base__token_buffer::writer_length() const {
+  return wuffs_base__token_buffer__writer_length(this);
+}
+
+inline wuffs_base__token*  //
+wuffs_base__token_buffer::writer_pointer() const {
+  return wuffs_base__token_buffer__writer_pointer(this);
+}
+
+inline wuffs_base__slice_token  //
+wuffs_base__token_buffer::writer_slice() const {
+  return wuffs_base__token_buffer__writer_slice(this);
+}
+
+inline uint64_t  //
+wuffs_base__token_buffer::writer_token_position() const {
+  return wuffs_base__token_buffer__writer_token_position(this);
+}
+
+#endif  // __cplusplus
+
+// ---------------- Memory Allocation
+
+// The memory allocation related functions in this section aren't used by Wuffs
+// per se, but they may be helpful to the code that uses Wuffs.
+
+// wuffs_base__malloc_slice_uxx wraps calling a malloc-like function, except
+// that it takes a uint64_t number of elements instead of a size_t size in
+// bytes, and it returns a slice (a pointer and a length) instead of just a
+// pointer.
+//
+// You can pass the C stdlib's malloc as the malloc_func.
+//
+// It returns an empty slice (containing a NULL ptr field) if (num_uxx *
+// sizeof(uintxx_t)) would overflow SIZE_MAX.
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__malloc_slice_u8(void* (*malloc_func)(size_t), uint64_t num_u8) {
+  if (malloc_func && (num_u8 <= (SIZE_MAX / sizeof(uint8_t)))) {
+    void* p = (*malloc_func)((size_t)(num_u8 * sizeof(uint8_t)));
+    if (p) {
+      return wuffs_base__make_slice_u8((uint8_t*)(p), (size_t)num_u8);
+    }
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+static inline wuffs_base__slice_u16  //
+wuffs_base__malloc_slice_u16(void* (*malloc_func)(size_t), uint64_t num_u16) {
+  if (malloc_func && (num_u16 <= (SIZE_MAX / sizeof(uint16_t)))) {
+    void* p = (*malloc_func)((size_t)(num_u16 * sizeof(uint16_t)));
+    if (p) {
+      return wuffs_base__make_slice_u16((uint16_t*)(p), (size_t)num_u16);
+    }
+  }
+  return wuffs_base__make_slice_u16(NULL, 0);
+}
+
+static inline wuffs_base__slice_u32  //
+wuffs_base__malloc_slice_u32(void* (*malloc_func)(size_t), uint64_t num_u32) {
+  if (malloc_func && (num_u32 <= (SIZE_MAX / sizeof(uint32_t)))) {
+    void* p = (*malloc_func)((size_t)(num_u32 * sizeof(uint32_t)));
+    if (p) {
+      return wuffs_base__make_slice_u32((uint32_t*)(p), (size_t)num_u32);
+    }
+  }
+  return wuffs_base__make_slice_u32(NULL, 0);
+}
+
+static inline wuffs_base__slice_u64  //
+wuffs_base__malloc_slice_u64(void* (*malloc_func)(size_t), uint64_t num_u64) {
+  if (malloc_func && (num_u64 <= (SIZE_MAX / sizeof(uint64_t)))) {
+    void* p = (*malloc_func)((size_t)(num_u64 * sizeof(uint64_t)));
+    if (p) {
+      return wuffs_base__make_slice_u64((uint64_t*)(p), (size_t)num_u64);
+    }
+  }
+  return wuffs_base__make_slice_u64(NULL, 0);
+}
+
+// ---------------- Images
+
+// wuffs_base__color_u32_argb_premul is an 8 bit per channel premultiplied
+// Alpha, Red, Green, Blue color, as a uint32_t value. Its value is always
+// 0xAARRGGBB (Alpha most significant, Blue least), regardless of endianness.
+typedef uint32_t wuffs_base__color_u32_argb_premul;
+
+// wuffs_base__color_u32_argb_premul__is_valid returns whether c's Red, Green
+// and Blue channels are all less than or equal to its Alpha channel. c uses
+// premultiplied alpha, so 50% opaque 100% saturated red is 0x7F7F_0000 and a
+// value like 0x7F80_0000 is invalid.
+static inline bool  //
+wuffs_base__color_u32_argb_premul__is_valid(
+    wuffs_base__color_u32_argb_premul c) {
+  uint32_t a = 0xFF & (c >> 24);
+  uint32_t r = 0xFF & (c >> 16);
+  uint32_t g = 0xFF & (c >> 8);
+  uint32_t b = 0xFF & (c >> 0);
+  return (a >= r) && (a >= g) && (a >= b);
+}
+
+static inline uint16_t  //
+wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
+    wuffs_base__color_u32_argb_premul c) {
+  uint32_t r5 = 0xF800 & (c >> 8);
+  uint32_t g6 = 0x07E0 & (c >> 5);
+  uint32_t b5 = 0x001F & (c >> 3);
+  return (uint16_t)(r5 | g6 | b5);
+}
+
+static inline wuffs_base__color_u32_argb_premul  //
+wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(uint16_t rgb_565) {
+  uint32_t b5 = 0x1F & (rgb_565 >> 0);
+  uint32_t b = (b5 << 3) | (b5 >> 2);
+  uint32_t g6 = 0x3F & (rgb_565 >> 5);
+  uint32_t g = (g6 << 2) | (g6 >> 4);
+  uint32_t r5 = 0x1F & (rgb_565 >> 11);
+  uint32_t r = (r5 << 3) | (r5 >> 2);
+  return 0xFF000000 | (r << 16) | (g << 8) | (b << 0);
+}
+
+static inline uint8_t  //
+wuffs_base__color_u32_argb_premul__as__color_u8_gray(
+    wuffs_base__color_u32_argb_premul c) {
+  // Work in 16-bit color.
+  uint32_t cr = 0x101 * (0xFF & (c >> 16));
+  uint32_t cg = 0x101 * (0xFF & (c >> 8));
+  uint32_t cb = 0x101 * (0xFF & (c >> 0));
+
+  // These coefficients (the fractions 0.299, 0.587 and 0.114) are the same
+  // as those given by the JFIF specification.
+  //
+  // Note that 19595 + 38470 + 7471 equals 65536, also known as (1 << 16). We
+  // shift by 24, not just by 16, because the return value is 8-bit color, not
+  // 16-bit color.
+  uint32_t weighted_average = (19595 * cr) + (38470 * cg) + (7471 * cb) + 32768;
+  return (uint8_t)(weighted_average >> 24);
+}
+
+static inline uint16_t  //
+wuffs_base__color_u32_argb_premul__as__color_u16_gray(
+    wuffs_base__color_u32_argb_premul c) {
+  // Work in 16-bit color.
+  uint32_t cr = 0x101 * (0xFF & (c >> 16));
+  uint32_t cg = 0x101 * (0xFF & (c >> 8));
+  uint32_t cb = 0x101 * (0xFF & (c >> 0));
+
+  // These coefficients (the fractions 0.299, 0.587 and 0.114) are the same
+  // as those given by the JFIF specification.
+  //
+  // Note that 19595 + 38470 + 7471 equals 65536, also known as (1 << 16).
+  uint32_t weighted_average = (19595 * cr) + (38470 * cg) + (7471 * cb) + 32768;
+  return (uint16_t)(weighted_average >> 16);
+}
+
+// wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul converts
+// from non-premultiplied alpha to premultiplied alpha.
+static inline wuffs_base__color_u32_argb_premul  //
+wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
+    uint32_t argb_nonpremul) {
+  // Multiplying by 0x101 (twice, once for alpha and once for color) converts
+  // from 8-bit to 16-bit color. Shifting right by 8 undoes that.
+  //
+  // Working in the higher bit depth can produce slightly different (and
+  // arguably slightly more accurate) results. For example, given 8-bit blue
+  // and alpha of 0x80 and 0x81:
+  //
+  //  - ((0x80   * 0x81  ) / 0xFF  )      = 0x40        = 0x40
+  //  - ((0x8080 * 0x8181) / 0xFFFF) >> 8 = 0x4101 >> 8 = 0x41
+  uint32_t a = 0xFF & (argb_nonpremul >> 24);
+  uint32_t a16 = a * (0x101 * 0x101);
+
+  uint32_t r = 0xFF & (argb_nonpremul >> 16);
+  r = ((r * a16) / 0xFFFF) >> 8;
+  uint32_t g = 0xFF & (argb_nonpremul >> 8);
+  g = ((g * a16) / 0xFFFF) >> 8;
+  uint32_t b = 0xFF & (argb_nonpremul >> 0);
+  b = ((b * a16) / 0xFFFF) >> 8;
+
+  return (a << 24) | (r << 16) | (g << 8) | (b << 0);
+}
+
+// wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul converts
+// from premultiplied alpha to non-premultiplied alpha.
+static inline uint32_t  //
+wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
+    wuffs_base__color_u32_argb_premul c) {
+  uint32_t a = 0xFF & (c >> 24);
+  if (a == 0xFF) {
+    return c;
+  } else if (a == 0) {
+    return 0;
+  }
+  uint32_t a16 = a * 0x101;
+
+  uint32_t r = 0xFF & (c >> 16);
+  r = ((r * (0x101 * 0xFFFF)) / a16) >> 8;
+  uint32_t g = 0xFF & (c >> 8);
+  g = ((g * (0x101 * 0xFFFF)) / a16) >> 8;
+  uint32_t b = 0xFF & (c >> 0);
+  b = ((b * (0x101 * 0xFFFF)) / a16) >> 8;
+
+  return (a << 24) | (r << 16) | (g << 8) | (b << 0);
+}
+
+// wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul converts
+// from 4x16LE non-premultiplied alpha to 4x8 premultiplied alpha.
+static inline wuffs_base__color_u32_argb_premul  //
+wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(
+    uint64_t argb_nonpremul) {
+  uint32_t a16 = ((uint32_t)(0xFFFF & (argb_nonpremul >> 48)));
+
+  uint32_t r16 = ((uint32_t)(0xFFFF & (argb_nonpremul >> 32)));
+  r16 = (r16 * a16) / 0xFFFF;
+  uint32_t g16 = ((uint32_t)(0xFFFF & (argb_nonpremul >> 16)));
+  g16 = (g16 * a16) / 0xFFFF;
+  uint32_t b16 = ((uint32_t)(0xFFFF & (argb_nonpremul >> 0)));
+  b16 = (b16 * a16) / 0xFFFF;
+
+  return ((a16 >> 8) << 24) | ((r16 >> 8) << 16) | ((g16 >> 8) << 8) |
+         ((b16 >> 8) << 0);
+}
+
+// wuffs_base__color_u32_argb_premul__as__color_u64_argb_nonpremul converts
+// from 4x8 premultiplied alpha to 4x16LE non-premultiplied alpha.
+static inline uint64_t  //
+wuffs_base__color_u32_argb_premul__as__color_u64_argb_nonpremul(
+    wuffs_base__color_u32_argb_premul c) {
+  uint32_t a = 0xFF & (c >> 24);
+  if (a == 0xFF) {
+    uint64_t r16 = 0x101 * (0xFF & (c >> 16));
+    uint64_t g16 = 0x101 * (0xFF & (c >> 8));
+    uint64_t b16 = 0x101 * (0xFF & (c >> 0));
+    return 0xFFFF000000000000u | (r16 << 32) | (g16 << 16) | (b16 << 0);
+  } else if (a == 0) {
+    return 0;
+  }
+  uint64_t a16 = a * 0x101;
+
+  uint64_t r = 0xFF & (c >> 16);
+  uint64_t r16 = (r * (0x101 * 0xFFFF)) / a16;
+  uint64_t g = 0xFF & (c >> 8);
+  uint64_t g16 = (g * (0x101 * 0xFFFF)) / a16;
+  uint64_t b = 0xFF & (c >> 0);
+  uint64_t b16 = (b * (0x101 * 0xFFFF)) / a16;
+
+  return (a16 << 48) | (r16 << 32) | (g16 << 16) | (b16 << 0);
+}
+
+static inline uint64_t  //
+wuffs_base__color_u32__as__color_u64(uint32_t c) {
+  uint64_t a16 = 0x101 * (0xFF & (c >> 24));
+  uint64_t r16 = 0x101 * (0xFF & (c >> 16));
+  uint64_t g16 = 0x101 * (0xFF & (c >> 8));
+  uint64_t b16 = 0x101 * (0xFF & (c >> 0));
+  return (a16 << 48) | (r16 << 32) | (g16 << 16) | (b16 << 0);
+}
+
+static inline uint32_t  //
+wuffs_base__color_u64__as__color_u32(uint64_t c) {
+  uint32_t a = ((uint32_t)(0xFF & (c >> 56)));
+  uint32_t r = ((uint32_t)(0xFF & (c >> 40)));
+  uint32_t g = ((uint32_t)(0xFF & (c >> 24)));
+  uint32_t b = ((uint32_t)(0xFF & (c >> 8)));
+  return (a << 24) | (r << 16) | (g << 8) | (b << 0);
+}
+
+// --------
+
+typedef uint8_t wuffs_base__pixel_blend;
+
+// wuffs_base__pixel_blend encodes how to blend source and destination pixels,
+// accounting for transparency. It encompasses the Porter-Duff compositing
+// operators as well as the other blending modes defined by PDF.
+//
+// TODO: implement the other modes.
+#define WUFFS_BASE__PIXEL_BLEND__SRC ((wuffs_base__pixel_blend)0)
+#define WUFFS_BASE__PIXEL_BLEND__SRC_OVER ((wuffs_base__pixel_blend)1)
+
+// --------
+
+// wuffs_base__pixel_alpha_transparency is a pixel format's alpha channel
+// model. It is a property of the pixel format in general, not of a specific
+// pixel. An RGBA pixel format (with alpha) can still have fully opaque pixels.
+typedef uint32_t wuffs_base__pixel_alpha_transparency;
+
+#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__OPAQUE 0
+#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__NONPREMULTIPLIED_ALPHA 1
+#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__PREMULTIPLIED_ALPHA 2
+#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__BINARY_ALPHA 3
+
+// Deprecated: use WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__NONPREMULTIPLIED_ALPHA
+// instead.
+#define WUFFS_BASE__PIXEL_ALPHA_TRANSPARENCY__NON_PREMULTIPLIED_ALPHA 1
+
+// --------
+
+#define WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX 4
+
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__INDEX_PLANE 0
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE 3
+
+// A palette is 256 entries × 4 bytes per entry (e.g. BGRA).
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH 1024
+
+// wuffs_base__pixel_format encodes the format of the bytes that constitute an
+// image frame's pixel data.
+//
+// See https://github.com/google/wuffs/blob/main/doc/note/pixel-formats.md
+//
+// Do not manipulate its bits directly; they are private implementation
+// details. Use methods such as wuffs_base__pixel_format__num_planes instead.
+typedef struct wuffs_base__pixel_format__struct {
+  uint32_t repr;
+
+#ifdef __cplusplus
+  inline bool is_valid() const;
+  inline uint32_t bits_per_pixel() const;
+  inline bool is_direct() const;
+  inline bool is_indexed() const;
+  inline bool is_interleaved() const;
+  inline bool is_planar() const;
+  inline uint32_t num_planes() const;
+  inline wuffs_base__pixel_alpha_transparency transparency() const;
+#endif  // __cplusplus
+
+} wuffs_base__pixel_format;
+
+static inline wuffs_base__pixel_format  //
+wuffs_base__make_pixel_format(uint32_t repr) {
+  wuffs_base__pixel_format f;
+  f.repr = repr;
+  return f;
+}
+
+// Common 8-bit-depth pixel formats. This list is not exhaustive; not all valid
+// wuffs_base__pixel_format values are present.
+
+#define WUFFS_BASE__PIXEL_FORMAT__INVALID 0x00000000
+
+#define WUFFS_BASE__PIXEL_FORMAT__A 0x02000008
+
+#define WUFFS_BASE__PIXEL_FORMAT__Y 0x20000008
+#define WUFFS_BASE__PIXEL_FORMAT__Y_16LE 0x2000000B
+#define WUFFS_BASE__PIXEL_FORMAT__Y_16BE 0x2010000B
+#define WUFFS_BASE__PIXEL_FORMAT__YA_NONPREMUL 0x21000008
+#define WUFFS_BASE__PIXEL_FORMAT__YA_PREMUL 0x22000008
+
+#define WUFFS_BASE__PIXEL_FORMAT__YCBCR 0x40020888
+#define WUFFS_BASE__PIXEL_FORMAT__YCBCRA_NONPREMUL 0x41038888
+#define WUFFS_BASE__PIXEL_FORMAT__YCBCRK 0x50038888
+
+#define WUFFS_BASE__PIXEL_FORMAT__YCOCG 0x60020888
+#define WUFFS_BASE__PIXEL_FORMAT__YCOCGA_NONPREMUL 0x61038888
+#define WUFFS_BASE__PIXEL_FORMAT__YCOCGK 0x70038888
+
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL 0x81040008
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL 0x82040008
+#define WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY 0x83040008
+
+#define WUFFS_BASE__PIXEL_FORMAT__BGR_565 0x80000565
+#define WUFFS_BASE__PIXEL_FORMAT__BGR 0x80000888
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL 0x81008888
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE 0x8100BBBB
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL 0x82008888
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL_4X16LE 0x8200BBBB
+#define WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY 0x83008888
+#define WUFFS_BASE__PIXEL_FORMAT__BGRX 0x90008888
+
+#define WUFFS_BASE__PIXEL_FORMAT__RGB 0xA0000888
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL 0xA1008888
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL_4X16LE 0xA100BBBB
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL 0xA2008888
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL_4X16LE 0xA200BBBB
+#define WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY 0xA3008888
+#define WUFFS_BASE__PIXEL_FORMAT__RGBX 0xB0008888
+
+#define WUFFS_BASE__PIXEL_FORMAT__CMY 0xC0020888
+#define WUFFS_BASE__PIXEL_FORMAT__CMYK 0xD0038888
+
+extern const uint32_t wuffs_base__pixel_format__bits_per_channel[16];
+
+static inline bool  //
+wuffs_base__pixel_format__is_valid(const wuffs_base__pixel_format* f) {
+  return f->repr != 0;
+}
+
+// wuffs_base__pixel_format__bits_per_pixel returns the number of bits per
+// pixel for interleaved pixel formats, and returns 0 for planar pixel formats.
+static inline uint32_t  //
+wuffs_base__pixel_format__bits_per_pixel(const wuffs_base__pixel_format* f) {
+  if (((f->repr >> 16) & 0x03) != 0) {
+    return 0;
+  }
+  return wuffs_base__pixel_format__bits_per_channel[0x0F & (f->repr >> 0)] +
+         wuffs_base__pixel_format__bits_per_channel[0x0F & (f->repr >> 4)] +
+         wuffs_base__pixel_format__bits_per_channel[0x0F & (f->repr >> 8)] +
+         wuffs_base__pixel_format__bits_per_channel[0x0F & (f->repr >> 12)];
+}
+
+static inline bool  //
+wuffs_base__pixel_format__is_direct(const wuffs_base__pixel_format* f) {
+  return ((f->repr >> 18) & 0x01) == 0;
+}
+
+static inline bool  //
+wuffs_base__pixel_format__is_indexed(const wuffs_base__pixel_format* f) {
+  return ((f->repr >> 18) & 0x01) != 0;
+}
+
+static inline bool  //
+wuffs_base__pixel_format__is_interleaved(const wuffs_base__pixel_format* f) {
+  return ((f->repr >> 16) & 0x03) == 0;
+}
+
+static inline bool  //
+wuffs_base__pixel_format__is_planar(const wuffs_base__pixel_format* f) {
+  return ((f->repr >> 16) & 0x03) != 0;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_format__num_planes(const wuffs_base__pixel_format* f) {
+  return ((f->repr >> 16) & 0x03) + 1;
+}
+
+static inline wuffs_base__pixel_alpha_transparency  //
+wuffs_base__pixel_format__transparency(const wuffs_base__pixel_format* f) {
+  return (wuffs_base__pixel_alpha_transparency)((f->repr >> 24) & 0x03);
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__pixel_format::is_valid() const {
+  return wuffs_base__pixel_format__is_valid(this);
+}
+
+inline uint32_t  //
+wuffs_base__pixel_format::bits_per_pixel() const {
+  return wuffs_base__pixel_format__bits_per_pixel(this);
+}
+
+inline bool  //
+wuffs_base__pixel_format::is_direct() const {
+  return wuffs_base__pixel_format__is_direct(this);
+}
+
+inline bool  //
+wuffs_base__pixel_format::is_indexed() const {
+  return wuffs_base__pixel_format__is_indexed(this);
+}
+
+inline bool  //
+wuffs_base__pixel_format::is_interleaved() const {
+  return wuffs_base__pixel_format__is_interleaved(this);
+}
+
+inline bool  //
+wuffs_base__pixel_format::is_planar() const {
+  return wuffs_base__pixel_format__is_planar(this);
+}
+
+inline uint32_t  //
+wuffs_base__pixel_format::num_planes() const {
+  return wuffs_base__pixel_format__num_planes(this);
+}
+
+inline wuffs_base__pixel_alpha_transparency  //
+wuffs_base__pixel_format::transparency() const {
+  return wuffs_base__pixel_format__transparency(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+// wuffs_base__pixel_subsampling encodes whether sample values cover one pixel
+// or cover multiple pixels.
+//
+// See https://github.com/google/wuffs/blob/main/doc/note/pixel-subsampling.md
+//
+// Do not manipulate its bits directly; they are private implementation
+// details. Use methods such as wuffs_base__pixel_subsampling__bias_x instead.
+typedef struct wuffs_base__pixel_subsampling__struct {
+  uint32_t repr;
+
+#ifdef __cplusplus
+  inline uint32_t bias_x(uint32_t plane) const;
+  inline uint32_t denominator_x(uint32_t plane) const;
+  inline uint32_t bias_y(uint32_t plane) const;
+  inline uint32_t denominator_y(uint32_t plane) const;
+#endif  // __cplusplus
+
+} wuffs_base__pixel_subsampling;
+
+static inline wuffs_base__pixel_subsampling  //
+wuffs_base__make_pixel_subsampling(uint32_t repr) {
+  wuffs_base__pixel_subsampling s;
+  s.repr = repr;
+  return s;
+}
+
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__NONE 0x00000000
+
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__444 0x000000
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__440 0x010100
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__422 0x101000
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__420 0x111100
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__411 0x303000
+#define WUFFS_BASE__PIXEL_SUBSAMPLING__410 0x313100
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__bias_x(const wuffs_base__pixel_subsampling* s,
+                                      uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 6;
+  return (s->repr >> shift) & 0x03;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__denominator_x(
+    const wuffs_base__pixel_subsampling* s,
+    uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 4;
+  return ((s->repr >> shift) & 0x03) + 1;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__bias_y(const wuffs_base__pixel_subsampling* s,
+                                      uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 2;
+  return (s->repr >> shift) & 0x03;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_subsampling__denominator_y(
+    const wuffs_base__pixel_subsampling* s,
+    uint32_t plane) {
+  uint32_t shift = ((plane & 0x03) * 8) + 0;
+  return ((s->repr >> shift) & 0x03) + 1;
+}
+
+#ifdef __cplusplus
+
+inline uint32_t  //
+wuffs_base__pixel_subsampling::bias_x(uint32_t plane) const {
+  return wuffs_base__pixel_subsampling__bias_x(this, plane);
+}
+
+inline uint32_t  //
+wuffs_base__pixel_subsampling::denominator_x(uint32_t plane) const {
+  return wuffs_base__pixel_subsampling__denominator_x(this, plane);
+}
+
+inline uint32_t  //
+wuffs_base__pixel_subsampling::bias_y(uint32_t plane) const {
+  return wuffs_base__pixel_subsampling__bias_y(this, plane);
+}
+
+inline uint32_t  //
+wuffs_base__pixel_subsampling::denominator_y(uint32_t plane) const {
+  return wuffs_base__pixel_subsampling__denominator_y(this, plane);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__pixel_config__struct {
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    wuffs_base__pixel_format pixfmt;
+    wuffs_base__pixel_subsampling pixsub;
+    uint32_t width;
+    uint32_t height;
+  } private_impl;
+
+#ifdef __cplusplus
+  inline void set(uint32_t pixfmt_repr,
+                  uint32_t pixsub_repr,
+                  uint32_t width,
+                  uint32_t height);
+  inline void invalidate();
+  inline bool is_valid() const;
+  inline wuffs_base__pixel_format pixel_format() const;
+  inline wuffs_base__pixel_subsampling pixel_subsampling() const;
+  inline wuffs_base__rect_ie_u32 bounds() const;
+  inline uint32_t width() const;
+  inline uint32_t height() const;
+  inline uint64_t pixbuf_len() const;
+#endif  // __cplusplus
+
+} wuffs_base__pixel_config;
+
+static inline wuffs_base__pixel_config  //
+wuffs_base__null_pixel_config() {
+  wuffs_base__pixel_config ret;
+  ret.private_impl.pixfmt.repr = 0;
+  ret.private_impl.pixsub.repr = 0;
+  ret.private_impl.width = 0;
+  ret.private_impl.height = 0;
+  return ret;
+}
+
+// TODO: Should this function return bool? An error type?
+static inline void  //
+wuffs_base__pixel_config__set(wuffs_base__pixel_config* c,
+                              uint32_t pixfmt_repr,
+                              uint32_t pixsub_repr,
+                              uint32_t width,
+                              uint32_t height) {
+  if (!c) {
+    return;
+  }
+  if (pixfmt_repr) {
+    uint64_t wh = ((uint64_t)width) * ((uint64_t)height);
+    // TODO: handle things other than 1 byte per pixel.
+    if (wh <= ((uint64_t)SIZE_MAX)) {
+      c->private_impl.pixfmt.repr = pixfmt_repr;
+      c->private_impl.pixsub.repr = pixsub_repr;
+      c->private_impl.width = width;
+      c->private_impl.height = height;
+      return;
+    }
+  }
+
+  c->private_impl.pixfmt.repr = 0;
+  c->private_impl.pixsub.repr = 0;
+  c->private_impl.width = 0;
+  c->private_impl.height = 0;
+}
+
+static inline void  //
+wuffs_base__pixel_config__invalidate(wuffs_base__pixel_config* c) {
+  if (c) {
+    c->private_impl.pixfmt.repr = 0;
+    c->private_impl.pixsub.repr = 0;
+    c->private_impl.width = 0;
+    c->private_impl.height = 0;
+  }
+}
+
+static inline bool  //
+wuffs_base__pixel_config__is_valid(const wuffs_base__pixel_config* c) {
+  return c && c->private_impl.pixfmt.repr;
+}
+
+static inline wuffs_base__pixel_format  //
+wuffs_base__pixel_config__pixel_format(const wuffs_base__pixel_config* c) {
+  return c ? c->private_impl.pixfmt : wuffs_base__make_pixel_format(0);
+}
+
+static inline wuffs_base__pixel_subsampling  //
+wuffs_base__pixel_config__pixel_subsampling(const wuffs_base__pixel_config* c) {
+  return c ? c->private_impl.pixsub : wuffs_base__make_pixel_subsampling(0);
+}
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__pixel_config__bounds(const wuffs_base__pixel_config* c) {
+  if (c) {
+    wuffs_base__rect_ie_u32 ret;
+    ret.min_incl_x = 0;
+    ret.min_incl_y = 0;
+    ret.max_excl_x = c->private_impl.width;
+    ret.max_excl_y = c->private_impl.height;
+    return ret;
+  }
+
+  wuffs_base__rect_ie_u32 ret;
+  ret.min_incl_x = 0;
+  ret.min_incl_y = 0;
+  ret.max_excl_x = 0;
+  ret.max_excl_y = 0;
+  return ret;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_config__width(const wuffs_base__pixel_config* c) {
+  return c ? c->private_impl.width : 0;
+}
+
+static inline uint32_t  //
+wuffs_base__pixel_config__height(const wuffs_base__pixel_config* c) {
+  return c ? c->private_impl.height : 0;
+}
+
+// TODO: this is the right API for planar (not interleaved) pixbufs? Should it
+// allow decoding into a color model different from the format's intrinsic one?
+// For example, decoding a JPEG image straight to RGBA instead of to YCbCr?
+static inline uint64_t  //
+wuffs_base__pixel_config__pixbuf_len(const wuffs_base__pixel_config* c) {
+  if (!c) {
+    return 0;
+  }
+  if (wuffs_base__pixel_format__is_planar(&c->private_impl.pixfmt)) {
+    // TODO: support planar pixel formats, concious of pixel subsampling.
+    return 0;
+  }
+  uint32_t bits_per_pixel =
+      wuffs_base__pixel_format__bits_per_pixel(&c->private_impl.pixfmt);
+  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
+    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
+    return 0;
+  }
+  uint64_t bytes_per_pixel = bits_per_pixel / 8;
+
+  uint64_t n =
+      ((uint64_t)c->private_impl.width) * ((uint64_t)c->private_impl.height);
+  if (n > (UINT64_MAX / bytes_per_pixel)) {
+    return 0;
+  }
+  n *= bytes_per_pixel;
+
+  if (wuffs_base__pixel_format__is_indexed(&c->private_impl.pixfmt)) {
+    if (n >
+        (UINT64_MAX - WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH)) {
+      return 0;
+    }
+    n += WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH;
+  }
+
+  return n;
+}
+
+#ifdef __cplusplus
+
+inline void  //
+wuffs_base__pixel_config::set(uint32_t pixfmt_repr,
+                              uint32_t pixsub_repr,
+                              uint32_t width,
+                              uint32_t height) {
+  wuffs_base__pixel_config__set(this, pixfmt_repr, pixsub_repr, width, height);
+}
+
+inline void  //
+wuffs_base__pixel_config::invalidate() {
+  wuffs_base__pixel_config__invalidate(this);
+}
+
+inline bool  //
+wuffs_base__pixel_config::is_valid() const {
+  return wuffs_base__pixel_config__is_valid(this);
+}
+
+inline wuffs_base__pixel_format  //
+wuffs_base__pixel_config::pixel_format() const {
+  return wuffs_base__pixel_config__pixel_format(this);
+}
+
+inline wuffs_base__pixel_subsampling  //
+wuffs_base__pixel_config::pixel_subsampling() const {
+  return wuffs_base__pixel_config__pixel_subsampling(this);
+}
+
+inline wuffs_base__rect_ie_u32  //
+wuffs_base__pixel_config::bounds() const {
+  return wuffs_base__pixel_config__bounds(this);
+}
+
+inline uint32_t  //
+wuffs_base__pixel_config::width() const {
+  return wuffs_base__pixel_config__width(this);
+}
+
+inline uint32_t  //
+wuffs_base__pixel_config::height() const {
+  return wuffs_base__pixel_config__height(this);
+}
+
+inline uint64_t  //
+wuffs_base__pixel_config::pixbuf_len() const {
+  return wuffs_base__pixel_config__pixbuf_len(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__image_config__struct {
+  wuffs_base__pixel_config pixcfg;
+
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    uint64_t first_frame_io_position;
+    bool first_frame_is_opaque;
+  } private_impl;
+
+#ifdef __cplusplus
+  inline void set(uint32_t pixfmt_repr,
+                  uint32_t pixsub_repr,
+                  uint32_t width,
+                  uint32_t height,
+                  uint64_t first_frame_io_position,
+                  bool first_frame_is_opaque);
+  inline void invalidate();
+  inline bool is_valid() const;
+  inline uint64_t first_frame_io_position() const;
+  inline bool first_frame_is_opaque() const;
+#endif  // __cplusplus
+
+} wuffs_base__image_config;
+
+static inline wuffs_base__image_config  //
+wuffs_base__null_image_config() {
+  wuffs_base__image_config ret;
+  ret.pixcfg = wuffs_base__null_pixel_config();
+  ret.private_impl.first_frame_io_position = 0;
+  ret.private_impl.first_frame_is_opaque = false;
+  return ret;
+}
+
+// TODO: Should this function return bool? An error type?
+static inline void  //
+wuffs_base__image_config__set(wuffs_base__image_config* c,
+                              uint32_t pixfmt_repr,
+                              uint32_t pixsub_repr,
+                              uint32_t width,
+                              uint32_t height,
+                              uint64_t first_frame_io_position,
+                              bool first_frame_is_opaque) {
+  if (!c) {
+    return;
+  }
+  if (pixfmt_repr) {
+    c->pixcfg.private_impl.pixfmt.repr = pixfmt_repr;
+    c->pixcfg.private_impl.pixsub.repr = pixsub_repr;
+    c->pixcfg.private_impl.width = width;
+    c->pixcfg.private_impl.height = height;
+    c->private_impl.first_frame_io_position = first_frame_io_position;
+    c->private_impl.first_frame_is_opaque = first_frame_is_opaque;
+    return;
+  }
+
+  c->pixcfg.private_impl.pixfmt.repr = 0;
+  c->pixcfg.private_impl.pixsub.repr = 0;
+  c->pixcfg.private_impl.width = 0;
+  c->pixcfg.private_impl.height = 0;
+  c->private_impl.first_frame_io_position = 0;
+  c->private_impl.first_frame_is_opaque = 0;
+}
+
+static inline void  //
+wuffs_base__image_config__invalidate(wuffs_base__image_config* c) {
+  if (c) {
+    c->pixcfg.private_impl.pixfmt.repr = 0;
+    c->pixcfg.private_impl.pixsub.repr = 0;
+    c->pixcfg.private_impl.width = 0;
+    c->pixcfg.private_impl.height = 0;
+    c->private_impl.first_frame_io_position = 0;
+    c->private_impl.first_frame_is_opaque = 0;
+  }
+}
+
+static inline bool  //
+wuffs_base__image_config__is_valid(const wuffs_base__image_config* c) {
+  return c && wuffs_base__pixel_config__is_valid(&(c->pixcfg));
+}
+
+static inline uint64_t  //
+wuffs_base__image_config__first_frame_io_position(
+    const wuffs_base__image_config* c) {
+  return c ? c->private_impl.first_frame_io_position : 0;
+}
+
+static inline bool  //
+wuffs_base__image_config__first_frame_is_opaque(
+    const wuffs_base__image_config* c) {
+  return c ? c->private_impl.first_frame_is_opaque : false;
+}
+
+#ifdef __cplusplus
+
+inline void  //
+wuffs_base__image_config::set(uint32_t pixfmt_repr,
+                              uint32_t pixsub_repr,
+                              uint32_t width,
+                              uint32_t height,
+                              uint64_t first_frame_io_position,
+                              bool first_frame_is_opaque) {
+  wuffs_base__image_config__set(this, pixfmt_repr, pixsub_repr, width, height,
+                                first_frame_io_position, first_frame_is_opaque);
+}
+
+inline void  //
+wuffs_base__image_config::invalidate() {
+  wuffs_base__image_config__invalidate(this);
+}
+
+inline bool  //
+wuffs_base__image_config::is_valid() const {
+  return wuffs_base__image_config__is_valid(this);
+}
+
+inline uint64_t  //
+wuffs_base__image_config::first_frame_io_position() const {
+  return wuffs_base__image_config__first_frame_io_position(this);
+}
+
+inline bool  //
+wuffs_base__image_config::first_frame_is_opaque() const {
+  return wuffs_base__image_config__first_frame_is_opaque(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+// wuffs_base__animation_disposal encodes, for an animated image, how to
+// dispose of a frame after displaying it:
+//  - None means to draw the next frame on top of this one.
+//  - Restore Background means to clear the frame's dirty rectangle to "the
+//    background color" (in practice, this means transparent black) before
+//    drawing the next frame.
+//  - Restore Previous means to undo the current frame, so that the next frame
+//    is drawn on top of the previous one.
+typedef uint8_t wuffs_base__animation_disposal;
+
+#define WUFFS_BASE__ANIMATION_DISPOSAL__NONE ((wuffs_base__animation_disposal)0)
+#define WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_BACKGROUND \
+  ((wuffs_base__animation_disposal)1)
+#define WUFFS_BASE__ANIMATION_DISPOSAL__RESTORE_PREVIOUS \
+  ((wuffs_base__animation_disposal)2)
+
+// --------
+
+typedef struct wuffs_base__frame_config__struct {
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    wuffs_base__rect_ie_u32 bounds;
+    wuffs_base__flicks duration;
+    uint64_t index;
+    uint64_t io_position;
+    wuffs_base__animation_disposal disposal;
+    bool opaque_within_bounds;
+    bool overwrite_instead_of_blend;
+    wuffs_base__color_u32_argb_premul background_color;
+  } private_impl;
+
+#ifdef __cplusplus
+  inline void set(wuffs_base__rect_ie_u32 bounds,
+                  wuffs_base__flicks duration,
+                  uint64_t index,
+                  uint64_t io_position,
+                  wuffs_base__animation_disposal disposal,
+                  bool opaque_within_bounds,
+                  bool overwrite_instead_of_blend,
+                  wuffs_base__color_u32_argb_premul background_color);
+  inline wuffs_base__rect_ie_u32 bounds() const;
+  inline uint32_t width() const;
+  inline uint32_t height() const;
+  inline wuffs_base__flicks duration() const;
+  inline uint64_t index() const;
+  inline uint64_t io_position() const;
+  inline wuffs_base__animation_disposal disposal() const;
+  inline bool opaque_within_bounds() const;
+  inline bool overwrite_instead_of_blend() const;
+  inline wuffs_base__color_u32_argb_premul background_color() const;
+#endif  // __cplusplus
+
+} wuffs_base__frame_config;
+
+static inline wuffs_base__frame_config  //
+wuffs_base__null_frame_config() {
+  wuffs_base__frame_config ret;
+  ret.private_impl.bounds = wuffs_base__make_rect_ie_u32(0, 0, 0, 0);
+  ret.private_impl.duration = 0;
+  ret.private_impl.index = 0;
+  ret.private_impl.io_position = 0;
+  ret.private_impl.disposal = 0;
+  ret.private_impl.opaque_within_bounds = false;
+  ret.private_impl.overwrite_instead_of_blend = false;
+  return ret;
+}
+
+static inline void  //
+wuffs_base__frame_config__set(
+    wuffs_base__frame_config* c,
+    wuffs_base__rect_ie_u32 bounds,
+    wuffs_base__flicks duration,
+    uint64_t index,
+    uint64_t io_position,
+    wuffs_base__animation_disposal disposal,
+    bool opaque_within_bounds,
+    bool overwrite_instead_of_blend,
+    wuffs_base__color_u32_argb_premul background_color) {
+  if (!c) {
+    return;
+  }
+
+  c->private_impl.bounds = bounds;
+  c->private_impl.duration = duration;
+  c->private_impl.index = index;
+  c->private_impl.io_position = io_position;
+  c->private_impl.disposal = disposal;
+  c->private_impl.opaque_within_bounds = opaque_within_bounds;
+  c->private_impl.overwrite_instead_of_blend = overwrite_instead_of_blend;
+  c->private_impl.background_color = background_color;
+}
+
+static inline wuffs_base__rect_ie_u32  //
+wuffs_base__frame_config__bounds(const wuffs_base__frame_config* c) {
+  if (c) {
+    return c->private_impl.bounds;
+  }
+
+  wuffs_base__rect_ie_u32 ret;
+  ret.min_incl_x = 0;
+  ret.min_incl_y = 0;
+  ret.max_excl_x = 0;
+  ret.max_excl_y = 0;
+  return ret;
+}
+
+static inline uint32_t  //
+wuffs_base__frame_config__width(const wuffs_base__frame_config* c) {
+  return c ? wuffs_base__rect_ie_u32__width(&c->private_impl.bounds) : 0;
+}
+
+static inline uint32_t  //
+wuffs_base__frame_config__height(const wuffs_base__frame_config* c) {
+  return c ? wuffs_base__rect_ie_u32__height(&c->private_impl.bounds) : 0;
+}
+
+// wuffs_base__frame_config__duration returns the amount of time to display
+// this frame. Zero means to display forever - a still (non-animated) image.
+static inline wuffs_base__flicks  //
+wuffs_base__frame_config__duration(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.duration : 0;
+}
+
+// wuffs_base__frame_config__index returns the index of this frame. The first
+// frame in an image has index 0, the second frame has index 1, and so on.
+static inline uint64_t  //
+wuffs_base__frame_config__index(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.index : 0;
+}
+
+// wuffs_base__frame_config__io_position returns the I/O stream position before
+// the frame config.
+static inline uint64_t  //
+wuffs_base__frame_config__io_position(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.io_position : 0;
+}
+
+// wuffs_base__frame_config__disposal returns, for an animated image, how to
+// dispose of this frame after displaying it.
+static inline wuffs_base__animation_disposal  //
+wuffs_base__frame_config__disposal(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.disposal : 0;
+}
+
+// wuffs_base__frame_config__opaque_within_bounds returns whether all pixels
+// within the frame's bounds are fully opaque. It makes no claim about pixels
+// outside the frame bounds but still inside the overall image. The two
+// bounding rectangles can differ for animated images.
+//
+// Its semantics are conservative. It is valid for a fully opaque frame to have
+// this value be false: a false negative.
+//
+// If true, drawing the frame with WUFFS_BASE__PIXEL_BLEND__SRC and
+// WUFFS_BASE__PIXEL_BLEND__SRC_OVER should be equivalent, in terms of
+// resultant pixels, but the former may be faster.
+static inline bool  //
+wuffs_base__frame_config__opaque_within_bounds(
+    const wuffs_base__frame_config* c) {
+  return c && c->private_impl.opaque_within_bounds;
+}
+
+// wuffs_base__frame_config__overwrite_instead_of_blend returns, for an
+// animated image, whether to ignore the previous image state (within the frame
+// bounds) when drawing this incremental frame. Equivalently, whether to use
+// WUFFS_BASE__PIXEL_BLEND__SRC instead of WUFFS_BASE__PIXEL_BLEND__SRC_OVER.
+//
+// The WebP spec (https://developers.google.com/speed/webp/docs/riff_container)
+// calls this the "Blending method" bit. WebP's "Do not blend" corresponds to
+// Wuffs' "overwrite_instead_of_blend".
+static inline bool  //
+wuffs_base__frame_config__overwrite_instead_of_blend(
+    const wuffs_base__frame_config* c) {
+  return c && c->private_impl.overwrite_instead_of_blend;
+}
+
+static inline wuffs_base__color_u32_argb_premul  //
+wuffs_base__frame_config__background_color(const wuffs_base__frame_config* c) {
+  return c ? c->private_impl.background_color : 0;
+}
+
+#ifdef __cplusplus
+
+inline void  //
+wuffs_base__frame_config::set(
+    wuffs_base__rect_ie_u32 bounds,
+    wuffs_base__flicks duration,
+    uint64_t index,
+    uint64_t io_position,
+    wuffs_base__animation_disposal disposal,
+    bool opaque_within_bounds,
+    bool overwrite_instead_of_blend,
+    wuffs_base__color_u32_argb_premul background_color) {
+  wuffs_base__frame_config__set(this, bounds, duration, index, io_position,
+                                disposal, opaque_within_bounds,
+                                overwrite_instead_of_blend, background_color);
+}
+
+inline wuffs_base__rect_ie_u32  //
+wuffs_base__frame_config::bounds() const {
+  return wuffs_base__frame_config__bounds(this);
+}
+
+inline uint32_t  //
+wuffs_base__frame_config::width() const {
+  return wuffs_base__frame_config__width(this);
+}
+
+inline uint32_t  //
+wuffs_base__frame_config::height() const {
+  return wuffs_base__frame_config__height(this);
+}
+
+inline wuffs_base__flicks  //
+wuffs_base__frame_config::duration() const {
+  return wuffs_base__frame_config__duration(this);
+}
+
+inline uint64_t  //
+wuffs_base__frame_config::index() const {
+  return wuffs_base__frame_config__index(this);
+}
+
+inline uint64_t  //
+wuffs_base__frame_config::io_position() const {
+  return wuffs_base__frame_config__io_position(this);
+}
+
+inline wuffs_base__animation_disposal  //
+wuffs_base__frame_config::disposal() const {
+  return wuffs_base__frame_config__disposal(this);
+}
+
+inline bool  //
+wuffs_base__frame_config::opaque_within_bounds() const {
+  return wuffs_base__frame_config__opaque_within_bounds(this);
+}
+
+inline bool  //
+wuffs_base__frame_config::overwrite_instead_of_blend() const {
+  return wuffs_base__frame_config__overwrite_instead_of_blend(this);
+}
+
+inline wuffs_base__color_u32_argb_premul  //
+wuffs_base__frame_config::background_color() const {
+  return wuffs_base__frame_config__background_color(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__pixel_buffer__struct {
+  wuffs_base__pixel_config pixcfg;
+
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    wuffs_base__table_u8 planes[WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX];
+    // TODO: color spaces.
+  } private_impl;
+
+#ifdef __cplusplus
+  inline wuffs_base__status set_interleaved(
+      const wuffs_base__pixel_config* pixcfg,
+      wuffs_base__table_u8 primary_memory,
+      wuffs_base__slice_u8 palette_memory);
+  inline wuffs_base__status set_from_slice(
+      const wuffs_base__pixel_config* pixcfg,
+      wuffs_base__slice_u8 pixbuf_memory);
+  inline wuffs_base__status set_from_table(
+      const wuffs_base__pixel_config* pixcfg,
+      wuffs_base__table_u8 primary_memory);
+  inline wuffs_base__slice_u8 palette();
+  inline wuffs_base__slice_u8 palette_or_else(wuffs_base__slice_u8 fallback);
+  inline wuffs_base__pixel_format pixel_format() const;
+  inline wuffs_base__table_u8 plane(uint32_t p);
+  inline wuffs_base__color_u32_argb_premul color_u32_at(uint32_t x,
+                                                        uint32_t y) const;
+  inline wuffs_base__status set_color_u32_at(
+      uint32_t x,
+      uint32_t y,
+      wuffs_base__color_u32_argb_premul color);
+  inline wuffs_base__status set_color_u32_fill_rect(
+      wuffs_base__rect_ie_u32 rect,
+      wuffs_base__color_u32_argb_premul color);
+#endif  // __cplusplus
+
+} wuffs_base__pixel_buffer;
+
+static inline wuffs_base__pixel_buffer  //
+wuffs_base__null_pixel_buffer() {
+  wuffs_base__pixel_buffer ret;
+  ret.pixcfg = wuffs_base__null_pixel_config();
+  ret.private_impl.planes[0] = wuffs_base__empty_table_u8();
+  ret.private_impl.planes[1] = wuffs_base__empty_table_u8();
+  ret.private_impl.planes[2] = wuffs_base__empty_table_u8();
+  ret.private_impl.planes[3] = wuffs_base__empty_table_u8();
+  return ret;
+}
+
+static inline wuffs_base__status  //
+wuffs_base__pixel_buffer__set_interleaved(
+    wuffs_base__pixel_buffer* pb,
+    const wuffs_base__pixel_config* pixcfg,
+    wuffs_base__table_u8 primary_memory,
+    wuffs_base__slice_u8 palette_memory) {
+  if (!pb) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  memset(pb, 0, sizeof(*pb));
+  if (!pixcfg ||
+      wuffs_base__pixel_format__is_planar(&pixcfg->private_impl.pixfmt)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if (wuffs_base__pixel_format__is_indexed(&pixcfg->private_impl.pixfmt) &&
+      (palette_memory.len <
+       WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH)) {
+    return wuffs_base__make_status(
+        wuffs_base__error__bad_argument_length_too_short);
+  }
+  uint32_t bits_per_pixel =
+      wuffs_base__pixel_format__bits_per_pixel(&pixcfg->private_impl.pixfmt);
+  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
+    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
+    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
+  }
+  uint64_t bytes_per_pixel = bits_per_pixel / 8;
+
+  uint64_t width_in_bytes =
+      ((uint64_t)pixcfg->private_impl.width) * bytes_per_pixel;
+  if ((width_in_bytes > primary_memory.width) ||
+      (pixcfg->private_impl.height > primary_memory.height)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+
+  pb->pixcfg = *pixcfg;
+  pb->private_impl.planes[0] = primary_memory;
+  if (wuffs_base__pixel_format__is_indexed(&pixcfg->private_impl.pixfmt)) {
+    wuffs_base__table_u8* tab =
+        &pb->private_impl
+             .planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
+    tab->ptr = palette_memory.ptr;
+    tab->width = WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH;
+    tab->height = 1;
+    tab->stride = WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH;
+  }
+  return wuffs_base__make_status(NULL);
+}
+
+static inline wuffs_base__status  //
+wuffs_base__pixel_buffer__set_from_slice(wuffs_base__pixel_buffer* pb,
+                                         const wuffs_base__pixel_config* pixcfg,
+                                         wuffs_base__slice_u8 pixbuf_memory) {
+  if (!pb) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  memset(pb, 0, sizeof(*pb));
+  if (!pixcfg) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if (wuffs_base__pixel_format__is_planar(&pixcfg->private_impl.pixfmt)) {
+    // TODO: support planar pixel formats, concious of pixel subsampling.
+    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
+  }
+  uint32_t bits_per_pixel =
+      wuffs_base__pixel_format__bits_per_pixel(&pixcfg->private_impl.pixfmt);
+  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
+    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
+    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
+  }
+  uint64_t bytes_per_pixel = bits_per_pixel / 8;
+
+  uint8_t* ptr = pixbuf_memory.ptr;
+  uint64_t len = pixbuf_memory.len;
+  if (wuffs_base__pixel_format__is_indexed(&pixcfg->private_impl.pixfmt)) {
+    // Split a WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH byte
+    // chunk (1024 bytes = 256 palette entries × 4 bytes per entry) from the
+    // start of pixbuf_memory. We split from the start, not the end, so that
+    // the both chunks' pointers have the same alignment as the original
+    // pointer, up to an alignment of 1024.
+    if (len < WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+      return wuffs_base__make_status(
+          wuffs_base__error__bad_argument_length_too_short);
+    }
+    wuffs_base__table_u8* tab =
+        &pb->private_impl
+             .planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
+    tab->ptr = ptr;
+    tab->width = WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH;
+    tab->height = 1;
+    tab->stride = WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH;
+    ptr += WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH;
+    len -= WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH;
+  }
+
+  uint64_t wh = ((uint64_t)pixcfg->private_impl.width) *
+                ((uint64_t)pixcfg->private_impl.height);
+  size_t width = (size_t)(pixcfg->private_impl.width);
+  if ((wh > (UINT64_MAX / bytes_per_pixel)) ||
+      (width > (SIZE_MAX / bytes_per_pixel))) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  wh *= bytes_per_pixel;
+  width = ((size_t)(width * bytes_per_pixel));
+  if (wh > len) {
+    return wuffs_base__make_status(
+        wuffs_base__error__bad_argument_length_too_short);
+  }
+
+  pb->pixcfg = *pixcfg;
+  wuffs_base__table_u8* tab = &pb->private_impl.planes[0];
+  tab->ptr = ptr;
+  tab->width = width;
+  tab->height = pixcfg->private_impl.height;
+  tab->stride = width;
+  return wuffs_base__make_status(NULL);
+}
+
+// Deprecated: does not handle indexed pixel configurations. Use
+// wuffs_base__pixel_buffer__set_interleaved instead.
+static inline wuffs_base__status  //
+wuffs_base__pixel_buffer__set_from_table(wuffs_base__pixel_buffer* pb,
+                                         const wuffs_base__pixel_config* pixcfg,
+                                         wuffs_base__table_u8 primary_memory) {
+  if (!pb) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  memset(pb, 0, sizeof(*pb));
+  if (!pixcfg ||
+      wuffs_base__pixel_format__is_indexed(&pixcfg->private_impl.pixfmt) ||
+      wuffs_base__pixel_format__is_planar(&pixcfg->private_impl.pixfmt)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  uint32_t bits_per_pixel =
+      wuffs_base__pixel_format__bits_per_pixel(&pixcfg->private_impl.pixfmt);
+  if ((bits_per_pixel == 0) || ((bits_per_pixel % 8) != 0)) {
+    // TODO: support fraction-of-byte pixels, e.g. 1 bit per pixel?
+    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
+  }
+  uint64_t bytes_per_pixel = bits_per_pixel / 8;
+
+  uint64_t width_in_bytes =
+      ((uint64_t)pixcfg->private_impl.width) * bytes_per_pixel;
+  if ((width_in_bytes > primary_memory.width) ||
+      (pixcfg->private_impl.height > primary_memory.height)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+
+  pb->pixcfg = *pixcfg;
+  pb->private_impl.planes[0] = primary_memory;
+  return wuffs_base__make_status(NULL);
+}
+
+// wuffs_base__pixel_buffer__palette returns the palette color data. If
+// non-empty, it will have length
+// WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH.
+static inline wuffs_base__slice_u8  //
+wuffs_base__pixel_buffer__palette(wuffs_base__pixel_buffer* pb) {
+  if (pb &&
+      wuffs_base__pixel_format__is_indexed(&pb->pixcfg.private_impl.pixfmt)) {
+    wuffs_base__table_u8* tab =
+        &pb->private_impl
+             .planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
+    if ((tab->width ==
+         WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) &&
+        (tab->height == 1)) {
+      return wuffs_base__make_slice_u8(
+          tab->ptr, WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH);
+    }
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__pixel_buffer__palette_or_else(wuffs_base__pixel_buffer* pb,
+                                          wuffs_base__slice_u8 fallback) {
+  if (pb &&
+      wuffs_base__pixel_format__is_indexed(&pb->pixcfg.private_impl.pixfmt)) {
+    wuffs_base__table_u8* tab =
+        &pb->private_impl
+             .planes[WUFFS_BASE__PIXEL_FORMAT__INDEXED__COLOR_PLANE];
+    if ((tab->width ==
+         WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) &&
+        (tab->height == 1)) {
+      return wuffs_base__make_slice_u8(
+          tab->ptr, WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH);
+    }
+  }
+  return fallback;
+}
+
+static inline wuffs_base__pixel_format  //
+wuffs_base__pixel_buffer__pixel_format(const wuffs_base__pixel_buffer* pb) {
+  if (pb) {
+    return pb->pixcfg.private_impl.pixfmt;
+  }
+  return wuffs_base__make_pixel_format(WUFFS_BASE__PIXEL_FORMAT__INVALID);
+}
+
+static inline wuffs_base__table_u8  //
+wuffs_base__pixel_buffer__plane(wuffs_base__pixel_buffer* pb, uint32_t p) {
+  if (pb && (p < WUFFS_BASE__PIXEL_FORMAT__NUM_PLANES_MAX)) {
+    return pb->private_impl.planes[p];
+  }
+
+  wuffs_base__table_u8 ret;
+  ret.ptr = NULL;
+  ret.width = 0;
+  ret.height = 0;
+  ret.stride = 0;
+  return ret;
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__color_u32_argb_premul  //
+wuffs_base__pixel_buffer__color_u32_at(const wuffs_base__pixel_buffer* pb,
+                                       uint32_t x,
+                                       uint32_t y);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_base__pixel_buffer__set_color_u32_at(
+    wuffs_base__pixel_buffer* pb,
+    uint32_t x,
+    uint32_t y,
+    wuffs_base__color_u32_argb_premul color);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_base__pixel_buffer__set_color_u32_fill_rect(
+    wuffs_base__pixel_buffer* pb,
+    wuffs_base__rect_ie_u32 rect,
+    wuffs_base__color_u32_argb_premul color);
+
+#ifdef __cplusplus
+
+inline wuffs_base__status  //
+wuffs_base__pixel_buffer::set_interleaved(
+    const wuffs_base__pixel_config* pixcfg_arg,
+    wuffs_base__table_u8 primary_memory,
+    wuffs_base__slice_u8 palette_memory) {
+  return wuffs_base__pixel_buffer__set_interleaved(
+      this, pixcfg_arg, primary_memory, palette_memory);
+}
+
+inline wuffs_base__status  //
+wuffs_base__pixel_buffer::set_from_slice(
+    const wuffs_base__pixel_config* pixcfg_arg,
+    wuffs_base__slice_u8 pixbuf_memory) {
+  return wuffs_base__pixel_buffer__set_from_slice(this, pixcfg_arg,
+                                                  pixbuf_memory);
+}
+
+inline wuffs_base__status  //
+wuffs_base__pixel_buffer::set_from_table(
+    const wuffs_base__pixel_config* pixcfg_arg,
+    wuffs_base__table_u8 primary_memory) {
+  return wuffs_base__pixel_buffer__set_from_table(this, pixcfg_arg,
+                                                  primary_memory);
+}
+
+inline wuffs_base__slice_u8  //
+wuffs_base__pixel_buffer::palette() {
+  return wuffs_base__pixel_buffer__palette(this);
+}
+
+inline wuffs_base__slice_u8  //
+wuffs_base__pixel_buffer::palette_or_else(wuffs_base__slice_u8 fallback) {
+  return wuffs_base__pixel_buffer__palette_or_else(this, fallback);
+}
+
+inline wuffs_base__pixel_format  //
+wuffs_base__pixel_buffer::pixel_format() const {
+  return wuffs_base__pixel_buffer__pixel_format(this);
+}
+
+inline wuffs_base__table_u8  //
+wuffs_base__pixel_buffer::plane(uint32_t p) {
+  return wuffs_base__pixel_buffer__plane(this, p);
+}
+
+inline wuffs_base__color_u32_argb_premul  //
+wuffs_base__pixel_buffer::color_u32_at(uint32_t x, uint32_t y) const {
+  return wuffs_base__pixel_buffer__color_u32_at(this, x, y);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_base__pixel_buffer__set_color_u32_fill_rect(
+    wuffs_base__pixel_buffer* pb,
+    wuffs_base__rect_ie_u32 rect,
+    wuffs_base__color_u32_argb_premul color);
+
+inline wuffs_base__status  //
+wuffs_base__pixel_buffer::set_color_u32_at(
+    uint32_t x,
+    uint32_t y,
+    wuffs_base__color_u32_argb_premul color) {
+  return wuffs_base__pixel_buffer__set_color_u32_at(this, x, y, color);
+}
+
+inline wuffs_base__status  //
+wuffs_base__pixel_buffer::set_color_u32_fill_rect(
+    wuffs_base__rect_ie_u32 rect,
+    wuffs_base__color_u32_argb_premul color) {
+  return wuffs_base__pixel_buffer__set_color_u32_fill_rect(this, rect, color);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+typedef struct wuffs_base__decode_frame_options__struct {
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    uint8_t TODO;
+  } private_impl;
+
+#ifdef __cplusplus
+#endif  // __cplusplus
+
+} wuffs_base__decode_frame_options;
+
+#ifdef __cplusplus
+
+#endif  // __cplusplus
+
+// --------
+
+// wuffs_base__pixel_palette__closest_element returns the index of the palette
+// element that minimizes the sum of squared differences of the four ARGB
+// channels, working in premultiplied alpha. Ties favor the smaller index.
+//
+// The palette_slice.len may equal (N*4), for N less than 256, which means that
+// only the first N palette elements are considered. It returns 0 when N is 0.
+//
+// Applying this function on a per-pixel basis will not produce whole-of-image
+// dithering.
+WUFFS_BASE__MAYBE_STATIC uint8_t  //
+wuffs_base__pixel_palette__closest_element(
+    wuffs_base__slice_u8 palette_slice,
+    wuffs_base__pixel_format palette_format,
+    wuffs_base__color_u32_argb_premul c);
+
+// --------
+
+// TODO: should the func type take restrict pointers?
+typedef uint64_t (*wuffs_base__pixel_swizzler__func)(uint8_t* dst_ptr,
+                                                     size_t dst_len,
+                                                     uint8_t* dst_palette_ptr,
+                                                     size_t dst_palette_len,
+                                                     const uint8_t* src_ptr,
+                                                     size_t src_len);
+
+typedef uint64_t (*wuffs_base__pixel_swizzler__transparent_black_func)(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    uint64_t num_pixels,
+    uint32_t dst_pixfmt_bytes_per_pixel);
+
+typedef struct wuffs_base__pixel_swizzler__struct {
+  // Do not access the private_impl's fields directly. There is no API/ABI
+  // compatibility or safety guarantee if you do so.
+  struct {
+    wuffs_base__pixel_swizzler__func func;
+    wuffs_base__pixel_swizzler__transparent_black_func transparent_black_func;
+    uint32_t dst_pixfmt_bytes_per_pixel;
+    uint32_t src_pixfmt_bytes_per_pixel;
+  } private_impl;
+
+#ifdef __cplusplus
+  inline wuffs_base__status prepare(wuffs_base__pixel_format dst_pixfmt,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_pixfmt,
+                                    wuffs_base__slice_u8 src_palette,
+                                    wuffs_base__pixel_blend blend);
+  inline uint64_t swizzle_interleaved_from_slice(
+      wuffs_base__slice_u8 dst,
+      wuffs_base__slice_u8 dst_palette,
+      wuffs_base__slice_u8 src) const;
+#endif  // __cplusplus
+
+} wuffs_base__pixel_swizzler;
+
+// wuffs_base__pixel_swizzler__prepare readies the pixel swizzler so that its
+// other methods may be called.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__PIXCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_base__pixel_swizzler__prepare(wuffs_base__pixel_swizzler* p,
+                                    wuffs_base__pixel_format dst_pixfmt,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_pixfmt,
+                                    wuffs_base__slice_u8 src_palette,
+                                    wuffs_base__pixel_blend blend);
+
+// wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice converts pixels
+// from a source format to a destination format.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__PIXCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(
+    const wuffs_base__pixel_swizzler* p,
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src);
+
+#ifdef __cplusplus
+
+inline wuffs_base__status  //
+wuffs_base__pixel_swizzler::prepare(wuffs_base__pixel_format dst_pixfmt,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_pixfmt,
+                                    wuffs_base__slice_u8 src_palette,
+                                    wuffs_base__pixel_blend blend) {
+  return wuffs_base__pixel_swizzler__prepare(this, dst_pixfmt, dst_palette,
+                                             src_pixfmt, src_palette, blend);
+}
+
+uint64_t  //
+wuffs_base__pixel_swizzler::swizzle_interleaved_from_slice(
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src) const {
+  return wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(
+      this, dst, dst_palette, src);
+}
+
+#endif  // __cplusplus
+
+// ---------------- String Conversions
+
+// Options (bitwise or'ed together) for wuffs_base__parse_number_xxx
+// functions. The XXX options apply to both integer and floating point. The FXX
+// options apply only to floating point.
+
+#define WUFFS_BASE__PARSE_NUMBER_XXX__DEFAULT_OPTIONS ((uint32_t)0x00000000)
+
+// WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_MULTIPLE_LEADING_ZEROES means to accept
+// inputs like "00", "0644" and "00.7". By default, they are rejected.
+#define WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_MULTIPLE_LEADING_ZEROES \
+  ((uint32_t)0x00000001)
+
+// WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES means to accept inputs like
+// "1__2" and "_3.141_592". By default, they are rejected.
+#define WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES ((uint32_t)0x00000002)
+
+// WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA means to accept
+// "1,5" and not "1.5" as one-and-a-half.
+//
+// If the caller wants to accept either, it is responsible for canonicalizing
+// the input before calling wuffs_base__parse_number_fxx. The caller also has
+// more context on e.g. exactly how to treat something like "$1,234".
+#define WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA \
+  ((uint32_t)0x00000010)
+
+// WUFFS_BASE__PARSE_NUMBER_FXX__REJECT_INF_AND_NAN means to reject inputs that
+// would lead to infinite or Not-a-Number floating point values. By default,
+// they are accepted.
+//
+// This affects the literal "inf" as input, but also affects inputs like
+// "1e999" that would overflow double-precision floating point.
+#define WUFFS_BASE__PARSE_NUMBER_FXX__REJECT_INF_AND_NAN ((uint32_t)0x00000020)
+
+// --------
+
+// Options (bitwise or'ed together) for wuffs_base__render_number_xxx
+// functions. The XXX options apply to both integer and floating point. The FXX
+// options apply only to floating point.
+
+#define WUFFS_BASE__RENDER_NUMBER_XXX__DEFAULT_OPTIONS ((uint32_t)0x00000000)
+
+// WUFFS_BASE__RENDER_NUMBER_XXX__ALIGN_RIGHT means to render to the right side
+// (higher indexes) of the destination slice, leaving any untouched bytes on
+// the left side (lower indexes). The default is vice versa: rendering on the
+// left with slack on the right.
+#define WUFFS_BASE__RENDER_NUMBER_XXX__ALIGN_RIGHT ((uint32_t)0x00000100)
+
+// WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN means to render the leading
+// "+" for non-negative numbers: "+0" and "+12.3" instead of "0" and "12.3".
+#define WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN ((uint32_t)0x00000200)
+
+// WUFFS_BASE__RENDER_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA means to render
+// one-and-a-half as "1,5" instead of "1.5".
+#define WUFFS_BASE__RENDER_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA \
+  ((uint32_t)0x00001000)
+
+// WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_ETC means whether to never
+// (EXPONENT_ABSENT, equivalent to printf's "%f") or to always
+// (EXPONENT_PRESENT, equivalent to printf's "%e") render a floating point
+// number as "1.23e+05" instead of "123000".
+//
+// Having both bits set is the same has having neither bit set, where the
+// notation used depends on whether the exponent is sufficiently large: "0.5"
+// is preferred over "5e-01" but "5e-09" is preferred over "0.000000005".
+#define WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_ABSENT ((uint32_t)0x00002000)
+#define WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_PRESENT ((uint32_t)0x00004000)
+
+// WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION means to render the
+// smallest number of digits so that parsing the resultant string will recover
+// the same double-precision floating point number.
+//
+// For example, double-precision cannot distinguish between 0.3 and
+// 0.299999999999999988897769753748434595763683319091796875, so when this bit
+// is set, rendering the latter will produce "0.3" but rendering
+// 0.3000000000000000444089209850062616169452667236328125 will produce
+// "0.30000000000000004".
+#define WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION \
+  ((uint32_t)0x00008000)
+
+// ---------------- IEEE 754 Floating Point
+
+// wuffs_base__ieee_754_bit_representation__etc converts between a double
+// precision numerical value and its IEEE 754 representations:
+//  - 16-bit: 1 sign bit,  5 exponent bits, 10 explicit significand bits.
+//  - 32-bit: 1 sign bit,  8 exponent bits, 23 explicit significand bits.
+//  - 64-bit: 1 sign bit, 11 exponent bits, 52 explicit significand bits.
+//
+// For example, it converts between:
+//  - +1.0 and 0x3C00, 0x3F80_0000 or 0x3FF0_0000_0000_0000.
+//  - +5.5 and 0x4580, 0x40B0_0000 or 0x4016_0000_0000_0000.
+//  - -inf and 0xFC00, 0xFF80_0000 or 0xFFF0_0000_0000_0000.
+//
+// Converting from f64 to shorter formats (f16 or f32, represented in C as
+// uint16_t and uint32_t) may be lossy. Such functions have names that look
+// like etc_truncate, as converting finite numbers produce equal or smaller
+// (closer-to-zero) finite numbers. For example, 1048576.0 is a perfectly valid
+// f64 number, but converting it to a f16 (with truncation) produces 65504.0,
+// the largest finite f16 number. Truncating a f64-typed value d to f32 does
+// not always produce the same result as the C-style cast ((float)d), as
+// casting can convert from finite numbers to infinite ones.
+//
+// Converting infinities or NaNs produces infinities or NaNs and always report
+// no loss, even though there a multiple NaN representations so that round-
+// tripping a f64-typed NaN may produce a different 64 bits. Nonetheless, the
+// etc_truncate functions preserve a NaN's "quiet vs signaling" bit.
+//
+// See https://en.wikipedia.org/wiki/Double-precision_floating-point_format
+
+typedef struct wuffs_base__lossy_value_u16__struct {
+  uint16_t value;
+  bool lossy;
+} wuffs_base__lossy_value_u16;
+
+typedef struct wuffs_base__lossy_value_u32__struct {
+  uint32_t value;
+  bool lossy;
+} wuffs_base__lossy_value_u32;
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__lossy_value_u16  //
+wuffs_base__ieee_754_bit_representation__from_f64_to_u16_truncate(double f);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__lossy_value_u32  //
+wuffs_base__ieee_754_bit_representation__from_f64_to_u32_truncate(double f);
+
+static inline uint64_t  //
+wuffs_base__ieee_754_bit_representation__from_f64_to_u64(double f) {
+  uint64_t u = 0;
+  if (sizeof(uint64_t) == sizeof(double)) {
+    memcpy(&u, &f, sizeof(uint64_t));
+  }
+  return u;
+}
+
+static inline double  //
+wuffs_base__ieee_754_bit_representation__from_u16_to_f64(uint16_t u) {
+  uint64_t v = ((uint64_t)(u & 0x8000)) << 48;
+
+  do {
+    uint64_t exp = (u >> 10) & 0x1F;
+    uint64_t man = u & 0x3FF;
+    if (exp == 0x1F) {  // Infinity or NaN.
+      exp = 2047;
+    } else if (exp != 0) {  // Normal.
+      exp += 1008;          // 1008 = 1023 - 15, the difference in biases.
+    } else if (man != 0) {  // Subnormal but non-zero.
+      uint32_t clz = wuffs_base__count_leading_zeroes_u64(man);
+      exp = 1062 - clz;  // 1062 = 1008 + 64 - 10.
+      man = 0x3FF & (man << (clz - 53));
+    } else {  // Zero.
+      break;
+    }
+    v |= (exp << 52) | (man << 42);
+  } while (0);
+
+  double f = 0;
+  if (sizeof(uint64_t) == sizeof(double)) {
+    memcpy(&f, &v, sizeof(uint64_t));
+  }
+  return f;
+}
+
+static inline double  //
+wuffs_base__ieee_754_bit_representation__from_u32_to_f64(uint32_t u) {
+  float f = 0;
+  if (sizeof(uint32_t) == sizeof(float)) {
+    memcpy(&f, &u, sizeof(uint32_t));
+  }
+  return (double)f;
+}
+
+static inline double  //
+wuffs_base__ieee_754_bit_representation__from_u64_to_f64(uint64_t u) {
+  double f = 0;
+  if (sizeof(uint64_t) == sizeof(double)) {
+    memcpy(&f, &u, sizeof(uint64_t));
+  }
+  return f;
+}
+
+// ---------------- Parsing and Rendering Numbers
+
+// wuffs_base__parse_number_f64 parses the floating point number in s. For
+// example, if s contains the bytes "1.5" then it will return the double 1.5.
+//
+// It returns an error if s does not contain a floating point number.
+//
+// It does not necessarily return an error if the conversion is lossy, e.g. if
+// s is "0.3", which double-precision floating point cannot represent exactly.
+//
+// Similarly, the returned value may be infinite (and no error returned) even
+// if s was not "inf", when the input is nominally finite but sufficiently
+// larger than DBL_MAX, about 1.8e+308.
+//
+// It is similar to the C standard library's strtod function, but:
+//  - Errors are returned in-band (in a result type), not out-of-band (errno).
+//  - It takes a slice (a pointer and length), not a NUL-terminated C string.
+//  - It does not take an optional endptr argument. It does not allow a partial
+//    parse: it returns an error unless all of s is consumed.
+//  - It does not allow whitespace, leading or otherwise.
+//  - It does not allow hexadecimal floating point numbers.
+//  - It is not affected by i18n / l10n settings such as environment variables.
+//
+// The options argument can change these, but by default, it:
+//  - Allows "inf", "+Infinity" and "-NAN", case insensitive. Similarly,
+//    without an explicit opt-out, it would successfully parse "1e999" as
+//    infinity, even though it overflows double-precision floating point.
+//  - Rejects underscores. With an explicit opt-in, "_3.141_592" would
+//    successfully parse as an approximation to π.
+//  - Rejects unnecessary leading zeroes: "00", "0644" and "00.7".
+//  - Uses a dot '1.5' instead of a comma '1,5' for the decimal separator.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__FLOATCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__result_f64  //
+wuffs_base__parse_number_f64(wuffs_base__slice_u8 s, uint32_t options);
+
+// wuffs_base__parse_number_i64 parses the ASCII integer in s. For example, if
+// s contains the bytes "-123" then it will return the int64_t -123.
+//
+// It returns an error if s does not contain an integer or if the integer
+// within would overflow an int64_t.
+//
+// It is similar to wuffs_base__parse_number_u64 but it returns a signed
+// integer, not an unsigned integer. It also allows a leading '+' or '-'.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__result_i64  //
+wuffs_base__parse_number_i64(wuffs_base__slice_u8 s, uint32_t options);
+
+// wuffs_base__parse_number_u64 parses the ASCII integer in s. For example, if
+// s contains the bytes "123" then it will return the uint64_t 123.
+//
+// It returns an error if s does not contain an integer or if the integer
+// within would overflow a uint64_t.
+//
+// It is similar to the C standard library's strtoull function, but:
+//  - Errors are returned in-band (in a result type), not out-of-band (errno).
+//  - It takes a slice (a pointer and length), not a NUL-terminated C string.
+//  - It does not take an optional endptr argument. It does not allow a partial
+//    parse: it returns an error unless all of s is consumed.
+//  - It does not allow whitespace, leading or otherwise.
+//  - It does not allow a leading '+' or '-'.
+//  - It does not take a base argument (e.g. base 10 vs base 16). Instead, it
+//    always accepts both decimal (e.g "1234", "0d5678") and hexadecimal (e.g.
+//    "0x9aBC"). The caller is responsible for prior filtering of e.g. hex
+//    numbers if they are unwanted. For example, Wuffs' JSON decoder will only
+//    produce a wuffs_base__token for decimal numbers, not hexadecimal.
+//  - It is not affected by i18n / l10n settings such as environment variables.
+//
+// The options argument can change these, but by default, it:
+//  - Rejects underscores. With an explicit opt-in, "__0D_1_002" would
+//    successfully parse as "one thousand and two". Underscores are still
+//    rejected inside the optional 2-byte opening "0d" or "0X" that denotes
+//    base-10 or base-16.
+//  - Rejects unnecessary leading zeroes: "00" and "0644".
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__result_u64  //
+wuffs_base__parse_number_u64(wuffs_base__slice_u8 s, uint32_t options);
+
+// --------
+
+// WUFFS_BASE__I64__BYTE_LENGTH__MAX_INCL is the string length of
+// "-9223372036854775808" and "+9223372036854775807", INT64_MIN and INT64_MAX.
+#define WUFFS_BASE__I64__BYTE_LENGTH__MAX_INCL 20
+
+// WUFFS_BASE__U64__BYTE_LENGTH__MAX_INCL is the string length of
+// "+18446744073709551615", UINT64_MAX.
+#define WUFFS_BASE__U64__BYTE_LENGTH__MAX_INCL 21
+
+// wuffs_base__render_number_f64 writes the decimal encoding of x to dst and
+// returns the number of bytes written. If dst is shorter than the entire
+// encoding, it returns 0 (and no bytes are written).
+//
+// For those familiar with C's printf or Go's fmt.Printf functions:
+//  - "%e" means the WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_PRESENT option.
+//  - "%f" means the WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_ABSENT  option.
+//  - "%g" means neither or both bits are set.
+//
+// The precision argument controls the number of digits rendered, excluding the
+// exponent (the "e+05" in "1.23e+05"):
+//  - for "%e" and "%f" it is the number of digits after the decimal separator,
+//  - for "%g" it is the number of significant digits (and trailing zeroes are
+//    removed).
+//
+// A precision of 6 gives similar output to printf's defaults.
+//
+// A precision greater than 4095 is equivalent to 4095.
+//
+// The precision argument is ignored when the
+// WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION option is set. This is
+// similar to Go's strconv.FormatFloat with a negative (i.e. non-sensical)
+// precision, but there is no corresponding feature in C's printf.
+//
+// Extreme values of x will be rendered as "NaN", "Inf" (or "+Inf" if the
+// WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN option is set) or "-Inf".
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__FLOATCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__render_number_f64(wuffs_base__slice_u8 dst,
+                              double x,
+                              uint32_t precision,
+                              uint32_t options);
+
+// wuffs_base__render_number_i64 writes the decimal encoding of x to dst and
+// returns the number of bytes written. If dst is shorter than the entire
+// encoding, it returns 0 (and no bytes are written).
+//
+// dst will never be too short if its length is at least 20, also known as
+// WUFFS_BASE__I64__BYTE_LENGTH__MAX_INCL.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__render_number_i64(wuffs_base__slice_u8 dst,
+                              int64_t x,
+                              uint32_t options);
+
+// wuffs_base__render_number_u64 writes the decimal encoding of x to dst and
+// returns the number of bytes written. If dst is shorter than the entire
+// encoding, it returns 0 (and no bytes are written).
+//
+// dst will never be too short if its length is at least 21, also known as
+// WUFFS_BASE__U64__BYTE_LENGTH__MAX_INCL.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__render_number_u64(wuffs_base__slice_u8 dst,
+                              uint64_t x,
+                              uint32_t options);
+
+// ---------------- Base-16
+
+// Options (bitwise or'ed together) for wuffs_base__base_16__xxx functions.
+
+#define WUFFS_BASE__BASE_16__DEFAULT_OPTIONS ((uint32_t)0x00000000)
+
+// wuffs_base__base_16__decode2 converts "6A6b" to "jk", where e.g. 'j' is
+// U+006A. There are 2 src bytes for every dst byte.
+//
+// It assumes that the src bytes are two hexadecimal digits (0-9, A-F, a-f),
+// repeated. It may write nonsense bytes if not, although it will not read or
+// write out of bounds.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_16__decode2(wuffs_base__slice_u8 dst,
+                             wuffs_base__slice_u8 src,
+                             bool src_closed,
+                             uint32_t options);
+
+// wuffs_base__base_16__decode4 converts both "\\x6A\\x6b" and "??6a??6B" to
+// "jk", where e.g. 'j' is U+006A. There are 4 src bytes for every dst byte.
+//
+// It assumes that the src bytes are two ignored bytes and then two hexadecimal
+// digits (0-9, A-F, a-f), repeated. It may write nonsense bytes if not,
+// although it will not read or write out of bounds.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_16__decode4(wuffs_base__slice_u8 dst,
+                             wuffs_base__slice_u8 src,
+                             bool src_closed,
+                             uint32_t options);
+
+// wuffs_base__base_16__encode2 converts "jk" to "6A6B", where e.g. 'j' is
+// U+006A. There are 2 dst bytes for every src byte.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_16__encode2(wuffs_base__slice_u8 dst,
+                             wuffs_base__slice_u8 src,
+                             bool src_closed,
+                             uint32_t options);
+
+// wuffs_base__base_16__encode4 converts "jk" to "\\x6A\\x6B", where e.g. 'j'
+// is U+006A. There are 4 dst bytes for every src byte.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_16__encode2(wuffs_base__slice_u8 dst,
+                             wuffs_base__slice_u8 src,
+                             bool src_closed,
+                             uint32_t options);
+
+// ---------------- Base-64
+
+// Options (bitwise or'ed together) for wuffs_base__base_64__xxx functions.
+
+#define WUFFS_BASE__BASE_64__DEFAULT_OPTIONS ((uint32_t)0x00000000)
+
+// WUFFS_BASE__BASE_64__DECODE_ALLOW_PADDING means that, when decoding base-64,
+// the input may (but does not need to) be padded with '=' bytes so that the
+// overall encoded length in bytes is a multiple of 4. A successful decoding
+// will return a num_src that includes those padding bytes.
+//
+// Excess padding (e.g. three final '='s) will be rejected as bad data.
+#define WUFFS_BASE__BASE_64__DECODE_ALLOW_PADDING ((uint32_t)0x00000001)
+
+// WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING means that, when encoding base-64,
+// the output will be padded with '=' bytes so that the overall encoded length
+// in bytes is a multiple of 4.
+#define WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING ((uint32_t)0x00000002)
+
+// WUFFS_BASE__BASE_64__URL_ALPHABET means that, for base-64, the URL-friendly
+// and file-name-friendly alphabet be used, as per RFC 4648 section 5. When
+// this option bit is off, the standard alphabet from section 4 is used.
+#define WUFFS_BASE__BASE_64__URL_ALPHABET ((uint32_t)0x00000100)
+
+// wuffs_base__base_64__decode transforms base-64 encoded bytes from src to
+// arbitrary bytes in dst.
+//
+// It will not permit line breaks or other whitespace in src. Filtering those
+// out is the responsibility of the caller.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_64__decode(wuffs_base__slice_u8 dst,
+                            wuffs_base__slice_u8 src,
+                            bool src_closed,
+                            uint32_t options);
+
+// wuffs_base__base_64__encode transforms arbitrary bytes from src to base-64
+// encoded bytes in dst.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__INTCONV sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_64__encode(wuffs_base__slice_u8 dst,
+                            wuffs_base__slice_u8 src,
+                            bool src_closed,
+                            uint32_t options);
+
+// ---------------- Unicode and UTF-8
+
+#define WUFFS_BASE__UNICODE_CODE_POINT__MIN_INCL 0x00000000
+#define WUFFS_BASE__UNICODE_CODE_POINT__MAX_INCL 0x0010FFFF
+
+#define WUFFS_BASE__UNICODE_REPLACEMENT_CHARACTER 0x0000FFFD
+
+#define WUFFS_BASE__UNICODE_SURROGATE__MIN_INCL 0x0000D800
+#define WUFFS_BASE__UNICODE_SURROGATE__MAX_INCL 0x0000DFFF
+
+#define WUFFS_BASE__ASCII__MIN_INCL 0x00
+#define WUFFS_BASE__ASCII__MAX_INCL 0x7F
+
+#define WUFFS_BASE__UTF_8__BYTE_LENGTH__MIN_INCL 1
+#define WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL 4
+
+#define WUFFS_BASE__UTF_8__BYTE_LENGTH_1__CODE_POINT__MIN_INCL 0x00000000
+#define WUFFS_BASE__UTF_8__BYTE_LENGTH_1__CODE_POINT__MAX_INCL 0x0000007F
+#define WUFFS_BASE__UTF_8__BYTE_LENGTH_2__CODE_POINT__MIN_INCL 0x00000080
+#define WUFFS_BASE__UTF_8__BYTE_LENGTH_2__CODE_POINT__MAX_INCL 0x000007FF
+#define WUFFS_BASE__UTF_8__BYTE_LENGTH_3__CODE_POINT__MIN_INCL 0x00000800
+#define WUFFS_BASE__UTF_8__BYTE_LENGTH_3__CODE_POINT__MAX_INCL 0x0000FFFF
+#define WUFFS_BASE__UTF_8__BYTE_LENGTH_4__CODE_POINT__MIN_INCL 0x00010000
+#define WUFFS_BASE__UTF_8__BYTE_LENGTH_4__CODE_POINT__MAX_INCL 0x0010FFFF
+
+// --------
+
+// wuffs_base__utf_8__next__output is the type returned by
+// wuffs_base__utf_8__next.
+typedef struct wuffs_base__utf_8__next__output__struct {
+  uint32_t code_point;
+  uint32_t byte_length;
+
+#ifdef __cplusplus
+  inline bool is_valid() const;
+#endif  // __cplusplus
+
+} wuffs_base__utf_8__next__output;
+
+static inline wuffs_base__utf_8__next__output  //
+wuffs_base__make_utf_8__next__output(uint32_t code_point,
+                                     uint32_t byte_length) {
+  wuffs_base__utf_8__next__output ret;
+  ret.code_point = code_point;
+  ret.byte_length = byte_length;
+  return ret;
+}
+
+static inline bool  //
+wuffs_base__utf_8__next__output__is_valid(
+    const wuffs_base__utf_8__next__output* o) {
+  if (o) {
+    uint32_t cp = o->code_point;
+    switch (o->byte_length) {
+      case 1:
+        return (cp <= 0x7F);
+      case 2:
+        return (0x080 <= cp) && (cp <= 0x7FF);
+      case 3:
+        // Avoid the 0xD800 ..= 0xDFFF surrogate range.
+        return ((0x0800 <= cp) && (cp <= 0xD7FF)) ||
+               ((0xE000 <= cp) && (cp <= 0xFFFF));
+      case 4:
+        return (0x00010000 <= cp) && (cp <= 0x0010FFFF);
+    }
+  }
+  return false;
+}
+
+#ifdef __cplusplus
+
+inline bool  //
+wuffs_base__utf_8__next__output::is_valid() const {
+  return wuffs_base__utf_8__next__output__is_valid(this);
+}
+
+#endif  // __cplusplus
+
+// --------
+
+// wuffs_base__utf_8__encode writes the UTF-8 encoding of code_point to s and
+// returns the number of bytes written. If code_point is invalid, or if s is
+// shorter than the entire encoding, it returns 0 (and no bytes are written).
+//
+// s will never be too short if its length is at least 4, also known as
+// WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__UTF8 sub-module, not just
+// WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__utf_8__encode(wuffs_base__slice_u8 dst, uint32_t code_point);
+
+// wuffs_base__utf_8__next returns the next UTF-8 code point (and that code
+// point's byte length) at the start of the read-only slice (s_ptr, s_len).
+//
+// There are exactly two cases in which this function returns something where
+// wuffs_base__utf_8__next__output__is_valid is false:
+//  - If s is empty then it returns {.code_point=0, .byte_length=0}.
+//  - If s is non-empty and starts with invalid UTF-8 then it returns
+//    {.code_point=WUFFS_BASE__UNICODE_REPLACEMENT_CHARACTER, .byte_length=1}.
+//
+// Otherwise, it returns something where
+// wuffs_base__utf_8__next__output__is_valid is true.
+//
+// In any case, it always returns an output that satisfies both of:
+//  - (output.code_point  <= WUFFS_BASE__UNICODE_CODE_POINT__MAX_INCL).
+//  - (output.byte_length <= s_len).
+//
+// If s is a sub-slice of a larger slice of valid UTF-8, but that sub-slice
+// boundary occurs in the middle of a multi-byte UTF-8 encoding of a single
+// code point, then this function may return something invalid. It is the
+// caller's responsibility to split on or otherwise manage UTF-8 boundaries.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__UTF8 sub-module, not just
+// WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__utf_8__next__output  //
+wuffs_base__utf_8__next(const uint8_t* s_ptr, size_t s_len);
+
+// wuffs_base__utf_8__next_from_end is like wuffs_base__utf_8__next except that
+// it looks at the end of (s_ptr, s_len) instead of the start.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__UTF8 sub-module, not just
+// WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC wuffs_base__utf_8__next__output  //
+wuffs_base__utf_8__next_from_end(const uint8_t* s_ptr, size_t s_len);
+
+// wuffs_base__utf_8__longest_valid_prefix returns the largest n such that the
+// sub-slice s[..n] is valid UTF-8, where s is the read-only slice (s_ptr,
+// s_len).
+//
+// In particular, it returns s_len if and only if all of s is valid UTF-8.
+//
+// If s is a sub-slice of a larger slice of valid UTF-8, but that sub-slice
+// boundary occurs in the middle of a multi-byte UTF-8 encoding of a single
+// code point, then this function will return less than s_len. It is the
+// caller's responsibility to split on or otherwise manage UTF-8 boundaries.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__UTF8 sub-module, not just
+// WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__utf_8__longest_valid_prefix(const uint8_t* s_ptr, size_t s_len);
+
+// wuffs_base__ascii__longest_valid_prefix returns the largest n such that the
+// sub-slice s[..n] is valid ASCII, where s is the read-only slice (s_ptr,
+// s_len).
+//
+// In particular, it returns s_len if and only if all of s is valid ASCII.
+// Equivalently, when none of the bytes in s have the 0x80 high bit set.
+//
+// For modular builds that divide the base module into sub-modules, using this
+// function requires the WUFFS_CONFIG__MODULE__BASE__UTF8 sub-module, not just
+// WUFFS_CONFIG__MODULE__BASE__CORE.
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__ascii__longest_valid_prefix(const uint8_t* s_ptr, size_t s_len);
+
+// ---------------- Interface Declarations.
+
+// For modular builds that divide the base module into sub-modules, using these
+// functions require the WUFFS_CONFIG__MODULE__BASE__INTERFACES sub-module, not
+// just WUFFS_CONFIG__MODULE__BASE__CORE.
+
+// --------
+
+extern const char wuffs_base__hasher_u32__vtable_name[];
+
+typedef struct wuffs_base__hasher_u32__func_ptrs__struct {
+  wuffs_base__empty_struct (*set_quirk_enabled)(
+    void* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+  uint32_t (*update_u32)(
+    void* self,
+    wuffs_base__slice_u8 a_x);
+} wuffs_base__hasher_u32__func_ptrs;
+
+typedef struct wuffs_base__hasher_u32__struct wuffs_base__hasher_u32;
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_base__hasher_u32__set_quirk_enabled(
+    wuffs_base__hasher_u32* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_base__hasher_u32__update_u32(
+    wuffs_base__hasher_u32* self,
+    wuffs_base__slice_u8 a_x);
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_base__hasher_u32__struct {
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable first_vtable;
+  } private_impl;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_base__hasher_u32, decltype(&free)>;
+#endif
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_base__hasher_u32__set_quirk_enabled(
+        this, a_quirk, a_enabled);
+  }
+
+  inline uint32_t
+  update_u32(
+      wuffs_base__slice_u8 a_x) {
+    return wuffs_base__hasher_u32__update_u32(
+        this, a_x);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_base__hasher_u32__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// --------
+
+extern const char wuffs_base__image_decoder__vtable_name[];
+
+typedef struct wuffs_base__image_decoder__func_ptrs__struct {
+  wuffs_base__status (*decode_frame)(
+    void* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts);
+  wuffs_base__status (*decode_frame_config)(
+    void* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+  wuffs_base__status (*decode_image_config)(
+    void* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+  wuffs_base__rect_ie_u32 (*frame_dirty_rect)(
+    const void* self);
+  uint32_t (*num_animation_loops)(
+    const void* self);
+  uint64_t (*num_decoded_frame_configs)(
+    const void* self);
+  uint64_t (*num_decoded_frames)(
+    const void* self);
+  wuffs_base__status (*restart_frame)(
+    void* self,
+    uint64_t a_index,
+    uint64_t a_io_position);
+  wuffs_base__empty_struct (*set_quirk_enabled)(
+    void* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+  wuffs_base__empty_struct (*set_report_metadata)(
+    void* self,
+    uint32_t a_fourcc,
+    bool a_report);
+  wuffs_base__status (*tell_me_more)(
+    void* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src);
+  wuffs_base__range_ii_u64 (*workbuf_len)(
+    const void* self);
+} wuffs_base__image_decoder__func_ptrs;
+
+typedef struct wuffs_base__image_decoder__struct wuffs_base__image_decoder;
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__image_decoder__decode_frame(
+    wuffs_base__image_decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__image_decoder__decode_frame_config(
+    wuffs_base__image_decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__image_decoder__decode_image_config(
+    wuffs_base__image_decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_base__image_decoder__frame_dirty_rect(
+    const wuffs_base__image_decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_base__image_decoder__num_animation_loops(
+    const wuffs_base__image_decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_base__image_decoder__num_decoded_frame_configs(
+    const wuffs_base__image_decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_base__image_decoder__num_decoded_frames(
+    const wuffs_base__image_decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__image_decoder__restart_frame(
+    wuffs_base__image_decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_base__image_decoder__set_quirk_enabled(
+    wuffs_base__image_decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_base__image_decoder__set_report_metadata(
+    wuffs_base__image_decoder* self,
+    uint32_t a_fourcc,
+    bool a_report);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__image_decoder__tell_me_more(
+    wuffs_base__image_decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_base__image_decoder__workbuf_len(
+    const wuffs_base__image_decoder* self);
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_base__image_decoder__struct {
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable first_vtable;
+  } private_impl;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_base__image_decoder, decltype(&free)>;
+#endif
+
+  inline wuffs_base__status
+  decode_frame(
+      wuffs_base__pixel_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__pixel_blend a_blend,
+      wuffs_base__slice_u8 a_workbuf,
+      wuffs_base__decode_frame_options* a_opts) {
+    return wuffs_base__image_decoder__decode_frame(
+        this, a_dst, a_src, a_blend, a_workbuf, a_opts);
+  }
+
+  inline wuffs_base__status
+  decode_frame_config(
+      wuffs_base__frame_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_base__image_decoder__decode_frame_config(
+        this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status
+  decode_image_config(
+      wuffs_base__image_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_base__image_decoder__decode_image_config(
+        this, a_dst, a_src);
+  }
+
+  inline wuffs_base__rect_ie_u32
+  frame_dirty_rect() const {
+    return wuffs_base__image_decoder__frame_dirty_rect(this);
+  }
+
+  inline uint32_t
+  num_animation_loops() const {
+    return wuffs_base__image_decoder__num_animation_loops(this);
+  }
+
+  inline uint64_t
+  num_decoded_frame_configs() const {
+    return wuffs_base__image_decoder__num_decoded_frame_configs(this);
+  }
+
+  inline uint64_t
+  num_decoded_frames() const {
+    return wuffs_base__image_decoder__num_decoded_frames(this);
+  }
+
+  inline wuffs_base__status
+  restart_frame(
+      uint64_t a_index,
+      uint64_t a_io_position) {
+    return wuffs_base__image_decoder__restart_frame(
+        this, a_index, a_io_position);
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_base__image_decoder__set_quirk_enabled(
+        this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__empty_struct
+  set_report_metadata(
+      uint32_t a_fourcc,
+      bool a_report) {
+    return wuffs_base__image_decoder__set_report_metadata(
+        this, a_fourcc, a_report);
+  }
+
+  inline wuffs_base__status
+  tell_me_more(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__more_information* a_minfo,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_base__image_decoder__tell_me_more(
+        this, a_dst, a_minfo, a_src);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_base__image_decoder__workbuf_len(this);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_base__image_decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// --------
+
+extern const char wuffs_base__io_transformer__vtable_name[];
+
+typedef struct wuffs_base__io_transformer__func_ptrs__struct {
+  wuffs_base__empty_struct (*set_quirk_enabled)(
+    void* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+  wuffs_base__status (*transform_io)(
+    void* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+  wuffs_base__range_ii_u64 (*workbuf_len)(
+    const void* self);
+} wuffs_base__io_transformer__func_ptrs;
+
+typedef struct wuffs_base__io_transformer__struct wuffs_base__io_transformer;
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_base__io_transformer__set_quirk_enabled(
+    wuffs_base__io_transformer* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__io_transformer__transform_io(
+    wuffs_base__io_transformer* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_base__io_transformer__workbuf_len(
+    const wuffs_base__io_transformer* self);
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_base__io_transformer__struct {
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable first_vtable;
+  } private_impl;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_base__io_transformer, decltype(&free)>;
+#endif
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_base__io_transformer__set_quirk_enabled(
+        this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__status
+  transform_io(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_base__io_transformer__transform_io(
+        this, a_dst, a_src, a_workbuf);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_base__io_transformer__workbuf_len(this);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_base__io_transformer__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// --------
+
+extern const char wuffs_base__token_decoder__vtable_name[];
+
+typedef struct wuffs_base__token_decoder__func_ptrs__struct {
+  wuffs_base__status (*decode_tokens)(
+    void* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+  wuffs_base__empty_struct (*set_quirk_enabled)(
+    void* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+  wuffs_base__range_ii_u64 (*workbuf_len)(
+    const void* self);
+} wuffs_base__token_decoder__func_ptrs;
+
+typedef struct wuffs_base__token_decoder__struct wuffs_base__token_decoder;
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__token_decoder__decode_tokens(
+    wuffs_base__token_decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_base__token_decoder__set_quirk_enabled(
+    wuffs_base__token_decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_base__token_decoder__workbuf_len(
+    const wuffs_base__token_decoder* self);
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_base__token_decoder__struct {
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable first_vtable;
+  } private_impl;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_base__token_decoder, decltype(&free)>;
+#endif
+
+  inline wuffs_base__status
+  decode_tokens(
+      wuffs_base__token_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_base__token_decoder__decode_tokens(
+        this, a_dst, a_src, a_workbuf);
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_base__token_decoder__set_quirk_enabled(
+        this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_base__token_decoder__workbuf_len(this);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_base__token_decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ----------------
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Status Codes
+
+// ---------------- Public Consts
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_adler32__hasher__struct wuffs_adler32__hasher;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_adler32__hasher__initialize(
+    wuffs_adler32__hasher* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_adler32__hasher();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_adler32__hasher*
+wuffs_adler32__hasher__alloc();
+
+static inline wuffs_base__hasher_u32*
+wuffs_adler32__hasher__alloc_as__wuffs_base__hasher_u32() {
+  return (wuffs_base__hasher_u32*)(wuffs_adler32__hasher__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__hasher_u32*
+wuffs_adler32__hasher__upcast_as__wuffs_base__hasher_u32(
+    wuffs_adler32__hasher* p) {
+  return (wuffs_base__hasher_u32*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_adler32__hasher__set_quirk_enabled(
+    wuffs_adler32__hasher* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_adler32__hasher__update_u32(
+    wuffs_adler32__hasher* self,
+    wuffs_base__slice_u8 a_x);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_adler32__hasher__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__hasher_u32;
+    wuffs_base__vtable null_vtable;
+
+    uint32_t f_state;
+    bool f_started;
+
+    wuffs_base__empty_struct (*choosy_up)(
+        wuffs_adler32__hasher* self,
+        wuffs_base__slice_u8 a_x);
+  } private_impl;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_adler32__hasher, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_adler32__hasher__alloc(), &free);
+  }
+
+  static inline wuffs_base__hasher_u32::unique_ptr
+  alloc_as__wuffs_base__hasher_u32() {
+    return wuffs_base__hasher_u32::unique_ptr(
+        wuffs_adler32__hasher__alloc_as__wuffs_base__hasher_u32(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_adler32__hasher__struct() = delete;
+  wuffs_adler32__hasher__struct(const wuffs_adler32__hasher__struct&) = delete;
+  wuffs_adler32__hasher__struct& operator=(
+      const wuffs_adler32__hasher__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_adler32__hasher__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__hasher_u32*
+  upcast_as__wuffs_base__hasher_u32() {
+    return (wuffs_base__hasher_u32*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_adler32__hasher__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline uint32_t
+  update_u32(
+      wuffs_base__slice_u8 a_x) {
+    return wuffs_adler32__hasher__update_u32(this, a_x);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_adler32__hasher__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_bmp__error__bad_header[];
+extern const char wuffs_bmp__error__bad_rle_compression[];
+extern const char wuffs_bmp__error__unsupported_bmp_file[];
+
+// ---------------- Public Consts
+
+#define WUFFS_BMP__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_bmp__decoder__struct wuffs_bmp__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_bmp__decoder__initialize(
+    wuffs_bmp__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_bmp__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_bmp__decoder*
+wuffs_bmp__decoder__alloc();
+
+static inline wuffs_base__image_decoder*
+wuffs_bmp__decoder__alloc_as__wuffs_base__image_decoder() {
+  return (wuffs_base__image_decoder*)(wuffs_bmp__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__image_decoder*
+wuffs_bmp__decoder__upcast_as__wuffs_base__image_decoder(
+    wuffs_bmp__decoder* p) {
+  return (wuffs_base__image_decoder*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_bmp__decoder__set_quirk_enabled(
+    wuffs_bmp__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_bmp__decoder__decode_image_config(
+    wuffs_bmp__decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_bmp__decoder__decode_frame_config(
+    wuffs_bmp__decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_bmp__decoder__decode_frame(
+    wuffs_bmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_bmp__decoder__frame_dirty_rect(
+    const wuffs_bmp__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_bmp__decoder__num_animation_loops(
+    const wuffs_bmp__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_bmp__decoder__num_decoded_frame_configs(
+    const wuffs_bmp__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_bmp__decoder__num_decoded_frames(
+    const wuffs_bmp__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_bmp__decoder__restart_frame(
+    wuffs_bmp__decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_bmp__decoder__set_report_metadata(
+    wuffs_bmp__decoder* self,
+    uint32_t a_fourcc,
+    bool a_report);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_bmp__decoder__tell_me_more(
+    wuffs_bmp__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_bmp__decoder__workbuf_len(
+    const wuffs_bmp__decoder* self);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_bmp__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__image_decoder;
+    wuffs_base__vtable null_vtable;
+
+    uint32_t f_width;
+    uint32_t f_height;
+    uint8_t f_call_sequence;
+    bool f_top_down;
+    uint32_t f_pad_per_row;
+    uint32_t f_src_pixfmt;
+    uint32_t f_io_redirect_fourcc;
+    uint64_t f_io_redirect_pos;
+    uint64_t f_frame_config_io_position;
+    uint32_t f_bitmap_info_len;
+    uint32_t f_padding;
+    uint32_t f_bits_per_pixel;
+    uint32_t f_compression;
+    uint32_t f_channel_masks[4];
+    uint8_t f_channel_shifts[4];
+    uint8_t f_channel_num_bits[4];
+    uint32_t f_dst_x;
+    uint32_t f_dst_y;
+    uint32_t f_dst_y_inc;
+    uint32_t f_pending_pad;
+    uint32_t f_rle_state;
+    uint32_t f_rle_length;
+    uint8_t f_rle_delta_x;
+    bool f_rle_padded;
+    wuffs_base__pixel_swizzler f_swizzler;
+
+    uint32_t p_decode_image_config[1];
+    uint32_t p_decode_frame_config[1];
+    uint32_t p_decode_frame[1];
+    uint32_t p_read_palette[1];
+  } private_impl;
+
+  struct {
+    uint8_t f_scratch[2048];
+    uint8_t f_src_palette[1024];
+
+    struct {
+      uint64_t scratch;
+    } s_decode_image_config[1];
+    struct {
+      wuffs_base__status v_status;
+      uint64_t scratch;
+    } s_decode_frame[1];
+    struct {
+      uint32_t v_i;
+      uint64_t scratch;
+    } s_read_palette[1];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_bmp__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_bmp__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__image_decoder::unique_ptr
+  alloc_as__wuffs_base__image_decoder() {
+    return wuffs_base__image_decoder::unique_ptr(
+        wuffs_bmp__decoder__alloc_as__wuffs_base__image_decoder(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_bmp__decoder__struct() = delete;
+  wuffs_bmp__decoder__struct(const wuffs_bmp__decoder__struct&) = delete;
+  wuffs_bmp__decoder__struct& operator=(
+      const wuffs_bmp__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_bmp__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__image_decoder*
+  upcast_as__wuffs_base__image_decoder() {
+    return (wuffs_base__image_decoder*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_bmp__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__status
+  decode_image_config(
+      wuffs_base__image_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_bmp__decoder__decode_image_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status
+  decode_frame_config(
+      wuffs_base__frame_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_bmp__decoder__decode_frame_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status
+  decode_frame(
+      wuffs_base__pixel_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__pixel_blend a_blend,
+      wuffs_base__slice_u8 a_workbuf,
+      wuffs_base__decode_frame_options* a_opts) {
+    return wuffs_bmp__decoder__decode_frame(this, a_dst, a_src, a_blend, a_workbuf, a_opts);
+  }
+
+  inline wuffs_base__rect_ie_u32
+  frame_dirty_rect() const {
+    return wuffs_bmp__decoder__frame_dirty_rect(this);
+  }
+
+  inline uint32_t
+  num_animation_loops() const {
+    return wuffs_bmp__decoder__num_animation_loops(this);
+  }
+
+  inline uint64_t
+  num_decoded_frame_configs() const {
+    return wuffs_bmp__decoder__num_decoded_frame_configs(this);
+  }
+
+  inline uint64_t
+  num_decoded_frames() const {
+    return wuffs_bmp__decoder__num_decoded_frames(this);
+  }
+
+  inline wuffs_base__status
+  restart_frame(
+      uint64_t a_index,
+      uint64_t a_io_position) {
+    return wuffs_bmp__decoder__restart_frame(this, a_index, a_io_position);
+  }
+
+  inline wuffs_base__empty_struct
+  set_report_metadata(
+      uint32_t a_fourcc,
+      bool a_report) {
+    return wuffs_bmp__decoder__set_report_metadata(this, a_fourcc, a_report);
+  }
+
+  inline wuffs_base__status
+  tell_me_more(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__more_information* a_minfo,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_bmp__decoder__tell_me_more(this, a_dst, a_minfo, a_src);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_bmp__decoder__workbuf_len(this);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_bmp__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_cbor__error__bad_input[];
+extern const char wuffs_cbor__error__unsupported_recursion_depth[];
+
+// ---------------- Public Consts
+
+#define WUFFS_CBOR__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0
+
+#define WUFFS_CBOR__DECODER_DEPTH_MAX_INCL 1024
+
+#define WUFFS_CBOR__DECODER_DST_TOKEN_BUFFER_LENGTH_MIN_INCL 2
+
+#define WUFFS_CBOR__DECODER_SRC_IO_BUFFER_LENGTH_MIN_INCL 9
+
+#define WUFFS_CBOR__TOKEN_VALUE_MAJOR 787997
+
+#define WUFFS_CBOR__TOKEN_VALUE_MINOR__DETAIL_MASK 262143
+
+#define WUFFS_CBOR__TOKEN_VALUE_MINOR__MINUS_1_MINUS_X 16777216
+
+#define WUFFS_CBOR__TOKEN_VALUE_MINOR__SIMPLE_VALUE 8388608
+
+#define WUFFS_CBOR__TOKEN_VALUE_MINOR__TAG 4194304
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_cbor__decoder__struct wuffs_cbor__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_cbor__decoder__initialize(
+    wuffs_cbor__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_cbor__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_cbor__decoder*
+wuffs_cbor__decoder__alloc();
+
+static inline wuffs_base__token_decoder*
+wuffs_cbor__decoder__alloc_as__wuffs_base__token_decoder() {
+  return (wuffs_base__token_decoder*)(wuffs_cbor__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__token_decoder*
+wuffs_cbor__decoder__upcast_as__wuffs_base__token_decoder(
+    wuffs_cbor__decoder* p) {
+  return (wuffs_base__token_decoder*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_cbor__decoder__set_quirk_enabled(
+    wuffs_cbor__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_cbor__decoder__workbuf_len(
+    const wuffs_cbor__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_cbor__decoder__decode_tokens(
+    wuffs_cbor__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_cbor__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__token_decoder;
+    wuffs_base__vtable null_vtable;
+
+    bool f_end_of_data;
+
+    uint32_t p_decode_tokens[1];
+  } private_impl;
+
+  struct {
+    uint32_t f_stack[64];
+    uint64_t f_container_num_remaining[1024];
+
+    struct {
+      uint64_t v_string_length;
+      uint32_t v_depth;
+      uint32_t v_token_length;
+      bool v_tagged;
+      uint8_t v_indefinite_string_major_type;
+    } s_decode_tokens[1];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_cbor__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_cbor__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__token_decoder::unique_ptr
+  alloc_as__wuffs_base__token_decoder() {
+    return wuffs_base__token_decoder::unique_ptr(
+        wuffs_cbor__decoder__alloc_as__wuffs_base__token_decoder(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_cbor__decoder__struct() = delete;
+  wuffs_cbor__decoder__struct(const wuffs_cbor__decoder__struct&) = delete;
+  wuffs_cbor__decoder__struct& operator=(
+      const wuffs_cbor__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_cbor__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__token_decoder*
+  upcast_as__wuffs_base__token_decoder() {
+    return (wuffs_base__token_decoder*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_cbor__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_cbor__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status
+  decode_tokens(
+      wuffs_base__token_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_cbor__decoder__decode_tokens(this, a_dst, a_src, a_workbuf);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_cbor__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+// ---------------- Public Consts
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_crc32__ieee_hasher__struct wuffs_crc32__ieee_hasher;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_crc32__ieee_hasher__initialize(
+    wuffs_crc32__ieee_hasher* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_crc32__ieee_hasher();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_crc32__ieee_hasher*
+wuffs_crc32__ieee_hasher__alloc();
+
+static inline wuffs_base__hasher_u32*
+wuffs_crc32__ieee_hasher__alloc_as__wuffs_base__hasher_u32() {
+  return (wuffs_base__hasher_u32*)(wuffs_crc32__ieee_hasher__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__hasher_u32*
+wuffs_crc32__ieee_hasher__upcast_as__wuffs_base__hasher_u32(
+    wuffs_crc32__ieee_hasher* p) {
+  return (wuffs_base__hasher_u32*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__set_quirk_enabled(
+    wuffs_crc32__ieee_hasher* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_crc32__ieee_hasher__update_u32(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_crc32__ieee_hasher__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__hasher_u32;
+    wuffs_base__vtable null_vtable;
+
+    uint32_t f_state;
+
+    wuffs_base__empty_struct (*choosy_up)(
+        wuffs_crc32__ieee_hasher* self,
+        wuffs_base__slice_u8 a_x);
+  } private_impl;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_crc32__ieee_hasher, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_crc32__ieee_hasher__alloc(), &free);
+  }
+
+  static inline wuffs_base__hasher_u32::unique_ptr
+  alloc_as__wuffs_base__hasher_u32() {
+    return wuffs_base__hasher_u32::unique_ptr(
+        wuffs_crc32__ieee_hasher__alloc_as__wuffs_base__hasher_u32(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_crc32__ieee_hasher__struct() = delete;
+  wuffs_crc32__ieee_hasher__struct(const wuffs_crc32__ieee_hasher__struct&) = delete;
+  wuffs_crc32__ieee_hasher__struct& operator=(
+      const wuffs_crc32__ieee_hasher__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_crc32__ieee_hasher__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__hasher_u32*
+  upcast_as__wuffs_base__hasher_u32() {
+    return (wuffs_base__hasher_u32*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_crc32__ieee_hasher__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline uint32_t
+  update_u32(
+      wuffs_base__slice_u8 a_x) {
+    return wuffs_crc32__ieee_hasher__update_u32(this, a_x);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_crc32__ieee_hasher__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_deflate__error__bad_huffman_code_over_subscribed[];
+extern const char wuffs_deflate__error__bad_huffman_code_under_subscribed[];
+extern const char wuffs_deflate__error__bad_huffman_code_length_count[];
+extern const char wuffs_deflate__error__bad_huffman_code_length_repetition[];
+extern const char wuffs_deflate__error__bad_huffman_code[];
+extern const char wuffs_deflate__error__bad_huffman_minimum_code_length[];
+extern const char wuffs_deflate__error__bad_block[];
+extern const char wuffs_deflate__error__bad_distance[];
+extern const char wuffs_deflate__error__bad_distance_code_count[];
+extern const char wuffs_deflate__error__bad_literal_length_code_count[];
+extern const char wuffs_deflate__error__inconsistent_stored_block_length[];
+extern const char wuffs_deflate__error__missing_end_of_block_code[];
+extern const char wuffs_deflate__error__no_huffman_codes[];
+
+// ---------------- Public Consts
+
+#define WUFFS_DEFLATE__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_deflate__decoder__struct wuffs_deflate__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_deflate__decoder__initialize(
+    wuffs_deflate__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_deflate__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_deflate__decoder*
+wuffs_deflate__decoder__alloc();
+
+static inline wuffs_base__io_transformer*
+wuffs_deflate__decoder__alloc_as__wuffs_base__io_transformer() {
+  return (wuffs_base__io_transformer*)(wuffs_deflate__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__io_transformer*
+wuffs_deflate__decoder__upcast_as__wuffs_base__io_transformer(
+    wuffs_deflate__decoder* p) {
+  return (wuffs_base__io_transformer*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_deflate__decoder__add_history(
+    wuffs_deflate__decoder* self,
+    wuffs_base__slice_u8 a_hist);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_deflate__decoder__set_quirk_enabled(
+    wuffs_deflate__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_deflate__decoder__workbuf_len(
+    const wuffs_deflate__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_deflate__decoder__transform_io(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_deflate__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__io_transformer;
+    wuffs_base__vtable null_vtable;
+
+    uint32_t f_bits;
+    uint32_t f_n_bits;
+    uint64_t f_transformed_history_count;
+    uint32_t f_history_index;
+    uint32_t f_n_huffs_bits[2];
+    bool f_end_of_block;
+
+    uint32_t p_transform_io[1];
+    uint32_t p_decode_blocks[1];
+    uint32_t p_decode_uncompressed[1];
+    uint32_t p_init_dynamic_huffman[1];
+    wuffs_base__status (*choosy_decode_huffman_fast64)(
+        wuffs_deflate__decoder* self,
+        wuffs_base__io_buffer* a_dst,
+        wuffs_base__io_buffer* a_src);
+    uint32_t p_decode_huffman_slow[1];
+  } private_impl;
+
+  struct {
+    uint32_t f_huffs[2][1024];
+    uint8_t f_history[33025];
+    uint8_t f_code_lengths[320];
+
+    struct {
+      uint32_t v_final;
+    } s_decode_blocks[1];
+    struct {
+      uint32_t v_length;
+      uint64_t scratch;
+    } s_decode_uncompressed[1];
+    struct {
+      uint32_t v_bits;
+      uint32_t v_n_bits;
+      uint32_t v_n_lit;
+      uint32_t v_n_dist;
+      uint32_t v_n_clen;
+      uint32_t v_i;
+      uint32_t v_mask;
+      uint32_t v_table_entry;
+      uint32_t v_n_extra_bits;
+      uint8_t v_rep_symbol;
+      uint32_t v_rep_count;
+    } s_init_dynamic_huffman[1];
+    struct {
+      uint32_t v_bits;
+      uint32_t v_n_bits;
+      uint32_t v_table_entry;
+      uint32_t v_table_entry_n_bits;
+      uint32_t v_lmask;
+      uint32_t v_dmask;
+      uint32_t v_redir_top;
+      uint32_t v_redir_mask;
+      uint32_t v_length;
+      uint32_t v_dist_minus_1;
+      uint32_t v_hlen;
+      uint32_t v_hdist;
+      uint64_t scratch;
+    } s_decode_huffman_slow[1];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_deflate__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_deflate__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__io_transformer::unique_ptr
+  alloc_as__wuffs_base__io_transformer() {
+    return wuffs_base__io_transformer::unique_ptr(
+        wuffs_deflate__decoder__alloc_as__wuffs_base__io_transformer(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_deflate__decoder__struct() = delete;
+  wuffs_deflate__decoder__struct(const wuffs_deflate__decoder__struct&) = delete;
+  wuffs_deflate__decoder__struct& operator=(
+      const wuffs_deflate__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_deflate__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__io_transformer*
+  upcast_as__wuffs_base__io_transformer() {
+    return (wuffs_base__io_transformer*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  add_history(
+      wuffs_base__slice_u8 a_hist) {
+    return wuffs_deflate__decoder__add_history(this, a_hist);
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_deflate__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_deflate__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status
+  transform_io(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_deflate__decoder__transform_io(this, a_dst, a_src, a_workbuf);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_deflate__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_lzw__error__bad_code[];
+
+// ---------------- Public Consts
+
+#define WUFFS_LZW__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_lzw__decoder__struct wuffs_lzw__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_lzw__decoder__initialize(
+    wuffs_lzw__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_lzw__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_lzw__decoder*
+wuffs_lzw__decoder__alloc();
+
+static inline wuffs_base__io_transformer*
+wuffs_lzw__decoder__alloc_as__wuffs_base__io_transformer() {
+  return (wuffs_base__io_transformer*)(wuffs_lzw__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__io_transformer*
+wuffs_lzw__decoder__upcast_as__wuffs_base__io_transformer(
+    wuffs_lzw__decoder* p) {
+  return (wuffs_base__io_transformer*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_lzw__decoder__set_quirk_enabled(
+    wuffs_lzw__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_lzw__decoder__set_literal_width(
+    wuffs_lzw__decoder* self,
+    uint32_t a_lw);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_lzw__decoder__workbuf_len(
+    const wuffs_lzw__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_lzw__decoder__transform_io(
+    wuffs_lzw__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__slice_u8
+wuffs_lzw__decoder__flush(
+    wuffs_lzw__decoder* self);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_lzw__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__io_transformer;
+    wuffs_base__vtable null_vtable;
+
+    uint32_t f_set_literal_width_arg;
+    uint32_t f_literal_width;
+    uint32_t f_clear_code;
+    uint32_t f_end_code;
+    uint32_t f_save_code;
+    uint32_t f_prev_code;
+    uint32_t f_width;
+    uint32_t f_bits;
+    uint32_t f_n_bits;
+    uint32_t f_output_ri;
+    uint32_t f_output_wi;
+    uint32_t f_read_from_return_value;
+    uint16_t f_prefixes[4096];
+
+    uint32_t p_transform_io[1];
+    uint32_t p_write_to[1];
+  } private_impl;
+
+  struct {
+    uint8_t f_suffixes[4096][8];
+    uint16_t f_lm1s[4096];
+    uint8_t f_output[8199];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_lzw__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_lzw__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__io_transformer::unique_ptr
+  alloc_as__wuffs_base__io_transformer() {
+    return wuffs_base__io_transformer::unique_ptr(
+        wuffs_lzw__decoder__alloc_as__wuffs_base__io_transformer(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_lzw__decoder__struct() = delete;
+  wuffs_lzw__decoder__struct(const wuffs_lzw__decoder__struct&) = delete;
+  wuffs_lzw__decoder__struct& operator=(
+      const wuffs_lzw__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_lzw__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__io_transformer*
+  upcast_as__wuffs_base__io_transformer() {
+    return (wuffs_base__io_transformer*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_lzw__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__empty_struct
+  set_literal_width(
+      uint32_t a_lw) {
+    return wuffs_lzw__decoder__set_literal_width(this, a_lw);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_lzw__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status
+  transform_io(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_lzw__decoder__transform_io(this, a_dst, a_src, a_workbuf);
+  }
+
+  inline wuffs_base__slice_u8
+  flush() {
+    return wuffs_lzw__decoder__flush(this);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_lzw__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_gif__error__bad_extension_label[];
+extern const char wuffs_gif__error__bad_frame_size[];
+extern const char wuffs_gif__error__bad_graphic_control[];
+extern const char wuffs_gif__error__bad_header[];
+extern const char wuffs_gif__error__bad_literal_width[];
+extern const char wuffs_gif__error__bad_palette[];
+
+// ---------------- Public Consts
+
+#define WUFFS_GIF__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0
+
+#define WUFFS_GIF__QUIRK_DELAY_NUM_DECODED_FRAMES 1041635328
+
+#define WUFFS_GIF__QUIRK_FIRST_FRAME_LOCAL_PALETTE_MEANS_BLACK_BACKGROUND 1041635329
+
+#define WUFFS_GIF__QUIRK_HONOR_BACKGROUND_COLOR 1041635330
+
+#define WUFFS_GIF__QUIRK_IGNORE_TOO_MUCH_PIXEL_DATA 1041635331
+
+#define WUFFS_GIF__QUIRK_IMAGE_BOUNDS_ARE_STRICT 1041635332
+
+#define WUFFS_GIF__QUIRK_REJECT_EMPTY_FRAME 1041635333
+
+#define WUFFS_GIF__QUIRK_REJECT_EMPTY_PALETTE 1041635334
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_gif__decoder__struct wuffs_gif__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_gif__decoder__initialize(
+    wuffs_gif__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_gif__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_gif__decoder*
+wuffs_gif__decoder__alloc();
+
+static inline wuffs_base__image_decoder*
+wuffs_gif__decoder__alloc_as__wuffs_base__image_decoder() {
+  return (wuffs_base__image_decoder*)(wuffs_gif__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__image_decoder*
+wuffs_gif__decoder__upcast_as__wuffs_base__image_decoder(
+    wuffs_gif__decoder* p) {
+  return (wuffs_base__image_decoder*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_gif__decoder__set_quirk_enabled(
+    wuffs_gif__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gif__decoder__decode_image_config(
+    wuffs_gif__decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_gif__decoder__set_report_metadata(
+    wuffs_gif__decoder* self,
+    uint32_t a_fourcc,
+    bool a_report);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gif__decoder__tell_me_more(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_gif__decoder__num_animation_loops(
+    const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_gif__decoder__num_decoded_frame_configs(
+    const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_gif__decoder__num_decoded_frames(
+    const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_gif__decoder__frame_dirty_rect(
+    const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_gif__decoder__workbuf_len(
+    const wuffs_gif__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gif__decoder__restart_frame(
+    wuffs_gif__decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gif__decoder__decode_frame_config(
+    wuffs_gif__decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gif__decoder__decode_frame(
+    wuffs_gif__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_gif__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__image_decoder;
+    wuffs_base__vtable null_vtable;
+
+    uint32_t f_width;
+    uint32_t f_height;
+    uint8_t f_call_sequence;
+    bool f_ignore_metadata;
+    bool f_report_metadata_iccp;
+    bool f_report_metadata_xmp;
+    uint32_t f_metadata_fourcc;
+    uint64_t f_metadata_io_position;
+    bool f_quirks[7];
+    bool f_delayed_num_decoded_frames;
+    bool f_end_of_data;
+    bool f_restarted;
+    bool f_previous_lzw_decode_ended_abruptly;
+    bool f_has_global_palette;
+    uint8_t f_interlace;
+    bool f_seen_num_animation_loops_value;
+    uint32_t f_num_animation_loops_value;
+    uint32_t f_background_color_u32_argb_premul;
+    uint32_t f_black_color_u32_argb_premul;
+    bool f_gc_has_transparent_index;
+    uint8_t f_gc_transparent_index;
+    uint8_t f_gc_disposal;
+    uint64_t f_gc_duration;
+    uint64_t f_frame_config_io_position;
+    uint64_t f_num_decoded_frame_configs_value;
+    uint64_t f_num_decoded_frames_value;
+    uint32_t f_frame_rect_x0;
+    uint32_t f_frame_rect_y0;
+    uint32_t f_frame_rect_x1;
+    uint32_t f_frame_rect_y1;
+    uint32_t f_dst_x;
+    uint32_t f_dst_y;
+    uint32_t f_dirty_max_excl_y;
+    uint64_t f_compressed_ri;
+    uint64_t f_compressed_wi;
+    wuffs_base__pixel_swizzler f_swizzler;
+
+    uint32_t p_decode_image_config[1];
+    uint32_t p_tell_me_more[1];
+    uint32_t p_decode_frame_config[1];
+    uint32_t p_skip_frame[1];
+    uint32_t p_decode_frame[1];
+    uint32_t p_decode_up_to_id_part1[1];
+    uint32_t p_decode_header[1];
+    uint32_t p_decode_lsd[1];
+    uint32_t p_decode_extension[1];
+    uint32_t p_skip_blocks[1];
+    uint32_t p_decode_ae[1];
+    uint32_t p_decode_gc[1];
+    uint32_t p_decode_id_part0[1];
+    uint32_t p_decode_id_part1[1];
+    uint32_t p_decode_id_part2[1];
+  } private_impl;
+
+  struct {
+    uint8_t f_compressed[4096];
+    uint8_t f_palettes[2][1024];
+    uint8_t f_dst_palette[1024];
+    wuffs_lzw__decoder f_lzw;
+
+    struct {
+      uint32_t v_background_color;
+    } s_decode_frame_config[1];
+    struct {
+      uint64_t scratch;
+    } s_skip_frame[1];
+    struct {
+      uint8_t v_c[6];
+      uint32_t v_i;
+    } s_decode_header[1];
+    struct {
+      uint8_t v_flags;
+      uint8_t v_background_color_index;
+      uint32_t v_num_palette_entries;
+      uint32_t v_i;
+      uint64_t scratch;
+    } s_decode_lsd[1];
+    struct {
+      uint64_t scratch;
+    } s_skip_blocks[1];
+    struct {
+      uint8_t v_block_size;
+      bool v_is_animexts;
+      bool v_is_netscape;
+      bool v_is_iccp;
+      bool v_is_xmp;
+      uint64_t scratch;
+    } s_decode_ae[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_gc[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_id_part0[1];
+    struct {
+      uint8_t v_which_palette;
+      uint32_t v_num_palette_entries;
+      uint32_t v_i;
+      uint64_t scratch;
+    } s_decode_id_part1[1];
+    struct {
+      uint64_t v_block_size;
+      bool v_need_block_size;
+      wuffs_base__status v_lzw_status;
+      uint64_t scratch;
+    } s_decode_id_part2[1];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_gif__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_gif__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__image_decoder::unique_ptr
+  alloc_as__wuffs_base__image_decoder() {
+    return wuffs_base__image_decoder::unique_ptr(
+        wuffs_gif__decoder__alloc_as__wuffs_base__image_decoder(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_gif__decoder__struct() = delete;
+  wuffs_gif__decoder__struct(const wuffs_gif__decoder__struct&) = delete;
+  wuffs_gif__decoder__struct& operator=(
+      const wuffs_gif__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_gif__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__image_decoder*
+  upcast_as__wuffs_base__image_decoder() {
+    return (wuffs_base__image_decoder*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_gif__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__status
+  decode_image_config(
+      wuffs_base__image_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_gif__decoder__decode_image_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__empty_struct
+  set_report_metadata(
+      uint32_t a_fourcc,
+      bool a_report) {
+    return wuffs_gif__decoder__set_report_metadata(this, a_fourcc, a_report);
+  }
+
+  inline wuffs_base__status
+  tell_me_more(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__more_information* a_minfo,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_gif__decoder__tell_me_more(this, a_dst, a_minfo, a_src);
+  }
+
+  inline uint32_t
+  num_animation_loops() const {
+    return wuffs_gif__decoder__num_animation_loops(this);
+  }
+
+  inline uint64_t
+  num_decoded_frame_configs() const {
+    return wuffs_gif__decoder__num_decoded_frame_configs(this);
+  }
+
+  inline uint64_t
+  num_decoded_frames() const {
+    return wuffs_gif__decoder__num_decoded_frames(this);
+  }
+
+  inline wuffs_base__rect_ie_u32
+  frame_dirty_rect() const {
+    return wuffs_gif__decoder__frame_dirty_rect(this);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_gif__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status
+  restart_frame(
+      uint64_t a_index,
+      uint64_t a_io_position) {
+    return wuffs_gif__decoder__restart_frame(this, a_index, a_io_position);
+  }
+
+  inline wuffs_base__status
+  decode_frame_config(
+      wuffs_base__frame_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_gif__decoder__decode_frame_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status
+  decode_frame(
+      wuffs_base__pixel_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__pixel_blend a_blend,
+      wuffs_base__slice_u8 a_workbuf,
+      wuffs_base__decode_frame_options* a_opts) {
+    return wuffs_gif__decoder__decode_frame(this, a_dst, a_src, a_blend, a_workbuf, a_opts);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_gif__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_gzip__error__bad_checksum[];
+extern const char wuffs_gzip__error__bad_compression_method[];
+extern const char wuffs_gzip__error__bad_encoding_flags[];
+extern const char wuffs_gzip__error__bad_header[];
+
+// ---------------- Public Consts
+
+#define WUFFS_GZIP__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_gzip__decoder__struct wuffs_gzip__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_gzip__decoder__initialize(
+    wuffs_gzip__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_gzip__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_gzip__decoder*
+wuffs_gzip__decoder__alloc();
+
+static inline wuffs_base__io_transformer*
+wuffs_gzip__decoder__alloc_as__wuffs_base__io_transformer() {
+  return (wuffs_base__io_transformer*)(wuffs_gzip__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__io_transformer*
+wuffs_gzip__decoder__upcast_as__wuffs_base__io_transformer(
+    wuffs_gzip__decoder* p) {
+  return (wuffs_base__io_transformer*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_gzip__decoder__set_quirk_enabled(
+    wuffs_gzip__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_gzip__decoder__workbuf_len(
+    const wuffs_gzip__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gzip__decoder__transform_io(
+    wuffs_gzip__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_gzip__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__io_transformer;
+    wuffs_base__vtable null_vtable;
+
+    bool f_ignore_checksum;
+
+    uint32_t p_transform_io[1];
+  } private_impl;
+
+  struct {
+    wuffs_crc32__ieee_hasher f_checksum;
+    wuffs_deflate__decoder f_flate;
+
+    struct {
+      uint8_t v_flags;
+      uint32_t v_checksum_got;
+      uint32_t v_decoded_length_got;
+      uint32_t v_checksum_want;
+      uint64_t scratch;
+    } s_transform_io[1];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_gzip__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_gzip__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__io_transformer::unique_ptr
+  alloc_as__wuffs_base__io_transformer() {
+    return wuffs_base__io_transformer::unique_ptr(
+        wuffs_gzip__decoder__alloc_as__wuffs_base__io_transformer(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_gzip__decoder__struct() = delete;
+  wuffs_gzip__decoder__struct(const wuffs_gzip__decoder__struct&) = delete;
+  wuffs_gzip__decoder__struct& operator=(
+      const wuffs_gzip__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_gzip__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__io_transformer*
+  upcast_as__wuffs_base__io_transformer() {
+    return (wuffs_base__io_transformer*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_gzip__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_gzip__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status
+  transform_io(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_gzip__decoder__transform_io(this, a_dst, a_src, a_workbuf);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_gzip__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_json__error__bad_c0_control_code[];
+extern const char wuffs_json__error__bad_utf_8[];
+extern const char wuffs_json__error__bad_backslash_escape[];
+extern const char wuffs_json__error__bad_input[];
+extern const char wuffs_json__error__bad_new_line_in_a_string[];
+extern const char wuffs_json__error__bad_quirk_combination[];
+extern const char wuffs_json__error__unsupported_number_length[];
+extern const char wuffs_json__error__unsupported_recursion_depth[];
+
+// ---------------- Public Consts
+
+#define WUFFS_JSON__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0
+
+#define WUFFS_JSON__DECODER_DEPTH_MAX_INCL 1024
+
+#define WUFFS_JSON__DECODER_DST_TOKEN_BUFFER_LENGTH_MIN_INCL 1
+
+#define WUFFS_JSON__DECODER_SRC_IO_BUFFER_LENGTH_MIN_INCL 100
+
+#define WUFFS_JSON__QUIRK_ALLOW_ASCII_CONTROL_CODES 1225364480
+
+#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_A 1225364481
+
+#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_CAPITAL_U 1225364482
+
+#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_E 1225364483
+
+#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_NEW_LINE 1225364484
+
+#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_QUESTION_MARK 1225364485
+
+#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_SINGLE_QUOTE 1225364486
+
+#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_V 1225364487
+
+#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_X_AS_CODE_POINTS 1225364489
+
+#define WUFFS_JSON__QUIRK_ALLOW_BACKSLASH_ZERO 1225364490
+
+#define WUFFS_JSON__QUIRK_ALLOW_COMMENT_BLOCK 1225364491
+
+#define WUFFS_JSON__QUIRK_ALLOW_COMMENT_LINE 1225364492
+
+#define WUFFS_JSON__QUIRK_ALLOW_EXTRA_COMMA 1225364493
+
+#define WUFFS_JSON__QUIRK_ALLOW_INF_NAN_NUMBERS 1225364494
+
+#define WUFFS_JSON__QUIRK_ALLOW_LEADING_ASCII_RECORD_SEPARATOR 1225364495
+
+#define WUFFS_JSON__QUIRK_ALLOW_LEADING_UNICODE_BYTE_ORDER_MARK 1225364496
+
+#define WUFFS_JSON__QUIRK_ALLOW_TRAILING_FILLER 1225364497
+
+#define WUFFS_JSON__QUIRK_EXPECT_TRAILING_NEW_LINE_OR_EOF 1225364498
+
+#define WUFFS_JSON__QUIRK_JSON_POINTER_ALLOW_TILDE_N_TILDE_R_TILDE_T 1225364499
+
+#define WUFFS_JSON__QUIRK_REPLACE_INVALID_UNICODE 1225364500
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_json__decoder__struct wuffs_json__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_json__decoder__initialize(
+    wuffs_json__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_json__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_json__decoder*
+wuffs_json__decoder__alloc();
+
+static inline wuffs_base__token_decoder*
+wuffs_json__decoder__alloc_as__wuffs_base__token_decoder() {
+  return (wuffs_base__token_decoder*)(wuffs_json__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__token_decoder*
+wuffs_json__decoder__upcast_as__wuffs_base__token_decoder(
+    wuffs_json__decoder* p) {
+  return (wuffs_base__token_decoder*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_json__decoder__set_quirk_enabled(
+    wuffs_json__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_json__decoder__workbuf_len(
+    const wuffs_json__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_json__decoder__decode_tokens(
+    wuffs_json__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_json__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__token_decoder;
+    wuffs_base__vtable null_vtable;
+
+    bool f_quirks[21];
+    bool f_allow_leading_ars;
+    bool f_allow_leading_ubom;
+    bool f_end_of_data;
+    uint8_t f_trailer_stop;
+    uint8_t f_comment_type;
+
+    uint32_t p_decode_tokens[1];
+    uint32_t p_decode_leading[1];
+    uint32_t p_decode_comment[1];
+    uint32_t p_decode_inf_nan[1];
+    uint32_t p_decode_trailer[1];
+  } private_impl;
+
+  struct {
+    uint32_t f_stack[32];
+
+    struct {
+      uint32_t v_depth;
+      uint32_t v_expect;
+      uint32_t v_expect_after_value;
+    } s_decode_tokens[1];
+    struct {
+      uint32_t v_neg;
+    } s_decode_inf_nan[1];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_json__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_json__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__token_decoder::unique_ptr
+  alloc_as__wuffs_base__token_decoder() {
+    return wuffs_base__token_decoder::unique_ptr(
+        wuffs_json__decoder__alloc_as__wuffs_base__token_decoder(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_json__decoder__struct() = delete;
+  wuffs_json__decoder__struct(const wuffs_json__decoder__struct&) = delete;
+  wuffs_json__decoder__struct& operator=(
+      const wuffs_json__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_json__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__token_decoder*
+  upcast_as__wuffs_base__token_decoder() {
+    return (wuffs_base__token_decoder*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_json__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_json__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status
+  decode_tokens(
+      wuffs_base__token_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_json__decoder__decode_tokens(this, a_dst, a_src, a_workbuf);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_json__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_nie__error__bad_header[];
+extern const char wuffs_nie__error__unsupported_nie_file[];
+
+// ---------------- Public Consts
+
+#define WUFFS_NIE__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_nie__decoder__struct wuffs_nie__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_nie__decoder__initialize(
+    wuffs_nie__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_nie__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_nie__decoder*
+wuffs_nie__decoder__alloc();
+
+static inline wuffs_base__image_decoder*
+wuffs_nie__decoder__alloc_as__wuffs_base__image_decoder() {
+  return (wuffs_base__image_decoder*)(wuffs_nie__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__image_decoder*
+wuffs_nie__decoder__upcast_as__wuffs_base__image_decoder(
+    wuffs_nie__decoder* p) {
+  return (wuffs_base__image_decoder*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_nie__decoder__set_quirk_enabled(
+    wuffs_nie__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_nie__decoder__decode_image_config(
+    wuffs_nie__decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_nie__decoder__decode_frame_config(
+    wuffs_nie__decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_nie__decoder__decode_frame(
+    wuffs_nie__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_nie__decoder__frame_dirty_rect(
+    const wuffs_nie__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_nie__decoder__num_animation_loops(
+    const wuffs_nie__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_nie__decoder__num_decoded_frame_configs(
+    const wuffs_nie__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_nie__decoder__num_decoded_frames(
+    const wuffs_nie__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_nie__decoder__restart_frame(
+    wuffs_nie__decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_nie__decoder__set_report_metadata(
+    wuffs_nie__decoder* self,
+    uint32_t a_fourcc,
+    bool a_report);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_nie__decoder__tell_me_more(
+    wuffs_nie__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_nie__decoder__workbuf_len(
+    const wuffs_nie__decoder* self);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_nie__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__image_decoder;
+    wuffs_base__vtable null_vtable;
+
+    uint32_t f_pixfmt;
+    uint32_t f_width;
+    uint32_t f_height;
+    uint8_t f_call_sequence;
+    uint32_t f_dst_x;
+    uint32_t f_dst_y;
+    wuffs_base__pixel_swizzler f_swizzler;
+
+    uint32_t p_decode_image_config[1];
+    uint32_t p_decode_frame_config[1];
+    uint32_t p_decode_frame[1];
+  } private_impl;
+
+  struct {
+    struct {
+      uint64_t scratch;
+    } s_decode_image_config[1];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_nie__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_nie__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__image_decoder::unique_ptr
+  alloc_as__wuffs_base__image_decoder() {
+    return wuffs_base__image_decoder::unique_ptr(
+        wuffs_nie__decoder__alloc_as__wuffs_base__image_decoder(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_nie__decoder__struct() = delete;
+  wuffs_nie__decoder__struct(const wuffs_nie__decoder__struct&) = delete;
+  wuffs_nie__decoder__struct& operator=(
+      const wuffs_nie__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_nie__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__image_decoder*
+  upcast_as__wuffs_base__image_decoder() {
+    return (wuffs_base__image_decoder*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_nie__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__status
+  decode_image_config(
+      wuffs_base__image_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_nie__decoder__decode_image_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status
+  decode_frame_config(
+      wuffs_base__frame_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_nie__decoder__decode_frame_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status
+  decode_frame(
+      wuffs_base__pixel_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__pixel_blend a_blend,
+      wuffs_base__slice_u8 a_workbuf,
+      wuffs_base__decode_frame_options* a_opts) {
+    return wuffs_nie__decoder__decode_frame(this, a_dst, a_src, a_blend, a_workbuf, a_opts);
+  }
+
+  inline wuffs_base__rect_ie_u32
+  frame_dirty_rect() const {
+    return wuffs_nie__decoder__frame_dirty_rect(this);
+  }
+
+  inline uint32_t
+  num_animation_loops() const {
+    return wuffs_nie__decoder__num_animation_loops(this);
+  }
+
+  inline uint64_t
+  num_decoded_frame_configs() const {
+    return wuffs_nie__decoder__num_decoded_frame_configs(this);
+  }
+
+  inline uint64_t
+  num_decoded_frames() const {
+    return wuffs_nie__decoder__num_decoded_frames(this);
+  }
+
+  inline wuffs_base__status
+  restart_frame(
+      uint64_t a_index,
+      uint64_t a_io_position) {
+    return wuffs_nie__decoder__restart_frame(this, a_index, a_io_position);
+  }
+
+  inline wuffs_base__empty_struct
+  set_report_metadata(
+      uint32_t a_fourcc,
+      bool a_report) {
+    return wuffs_nie__decoder__set_report_metadata(this, a_fourcc, a_report);
+  }
+
+  inline wuffs_base__status
+  tell_me_more(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__more_information* a_minfo,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_nie__decoder__tell_me_more(this, a_dst, a_minfo, a_src);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_nie__decoder__workbuf_len(this);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_nie__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_zlib__note__dictionary_required[];
+extern const char wuffs_zlib__error__bad_checksum[];
+extern const char wuffs_zlib__error__bad_compression_method[];
+extern const char wuffs_zlib__error__bad_compression_window_size[];
+extern const char wuffs_zlib__error__bad_parity_check[];
+extern const char wuffs_zlib__error__incorrect_dictionary[];
+
+// ---------------- Public Consts
+
+#define WUFFS_ZLIB__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 1
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_zlib__decoder__struct wuffs_zlib__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_zlib__decoder__initialize(
+    wuffs_zlib__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_zlib__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_zlib__decoder*
+wuffs_zlib__decoder__alloc();
+
+static inline wuffs_base__io_transformer*
+wuffs_zlib__decoder__alloc_as__wuffs_base__io_transformer() {
+  return (wuffs_base__io_transformer*)(wuffs_zlib__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__io_transformer*
+wuffs_zlib__decoder__upcast_as__wuffs_base__io_transformer(
+    wuffs_zlib__decoder* p) {
+  return (wuffs_base__io_transformer*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_zlib__decoder__dictionary_id(
+    const wuffs_zlib__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_zlib__decoder__add_dictionary(
+    wuffs_zlib__decoder* self,
+    wuffs_base__slice_u8 a_dict);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_zlib__decoder__set_quirk_enabled(
+    wuffs_zlib__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_zlib__decoder__workbuf_len(
+    const wuffs_zlib__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_zlib__decoder__transform_io(
+    wuffs_zlib__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_zlib__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__io_transformer;
+    wuffs_base__vtable null_vtable;
+
+    bool f_bad_call_sequence;
+    bool f_header_complete;
+    bool f_got_dictionary;
+    bool f_want_dictionary;
+    bool f_ignore_checksum;
+    uint32_t f_dict_id_got;
+    uint32_t f_dict_id_want;
+
+    uint32_t p_transform_io[1];
+  } private_impl;
+
+  struct {
+    wuffs_adler32__hasher f_checksum;
+    wuffs_adler32__hasher f_dict_id_hasher;
+    wuffs_deflate__decoder f_flate;
+
+    struct {
+      uint32_t v_checksum_got;
+      uint64_t scratch;
+    } s_transform_io[1];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_zlib__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_zlib__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__io_transformer::unique_ptr
+  alloc_as__wuffs_base__io_transformer() {
+    return wuffs_base__io_transformer::unique_ptr(
+        wuffs_zlib__decoder__alloc_as__wuffs_base__io_transformer(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_zlib__decoder__struct() = delete;
+  wuffs_zlib__decoder__struct(const wuffs_zlib__decoder__struct&) = delete;
+  wuffs_zlib__decoder__struct& operator=(
+      const wuffs_zlib__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_zlib__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__io_transformer*
+  upcast_as__wuffs_base__io_transformer() {
+    return (wuffs_base__io_transformer*)this;
+  }
+
+  inline uint32_t
+  dictionary_id() const {
+    return wuffs_zlib__decoder__dictionary_id(this);
+  }
+
+  inline wuffs_base__empty_struct
+  add_dictionary(
+      wuffs_base__slice_u8 a_dict) {
+    return wuffs_zlib__decoder__add_dictionary(this, a_dict);
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_zlib__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_zlib__decoder__workbuf_len(this);
+  }
+
+  inline wuffs_base__status
+  transform_io(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__slice_u8 a_workbuf) {
+    return wuffs_zlib__decoder__transform_io(this, a_dst, a_src, a_workbuf);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_zlib__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_png__error__bad_animation_sequence_number[];
+extern const char wuffs_png__error__bad_checksum[];
+extern const char wuffs_png__error__bad_chunk[];
+extern const char wuffs_png__error__bad_filter[];
+extern const char wuffs_png__error__bad_header[];
+extern const char wuffs_png__error__bad_text_chunk_not_latin_1[];
+extern const char wuffs_png__error__missing_palette[];
+extern const char wuffs_png__error__unsupported_png_compression_method[];
+extern const char wuffs_png__error__unsupported_png_file[];
+
+// ---------------- Public Consts
+
+#define WUFFS_PNG__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0
+
+#define WUFFS_PNG__DECODER_SRC_IO_BUFFER_LENGTH_MIN_INCL 8
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_png__decoder__struct wuffs_png__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_png__decoder__initialize(
+    wuffs_png__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_png__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_png__decoder*
+wuffs_png__decoder__alloc();
+
+static inline wuffs_base__image_decoder*
+wuffs_png__decoder__alloc_as__wuffs_base__image_decoder() {
+  return (wuffs_base__image_decoder*)(wuffs_png__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__image_decoder*
+wuffs_png__decoder__upcast_as__wuffs_base__image_decoder(
+    wuffs_png__decoder* p) {
+  return (wuffs_base__image_decoder*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_png__decoder__set_quirk_enabled(
+    wuffs_png__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_png__decoder__decode_image_config(
+    wuffs_png__decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_png__decoder__decode_frame_config(
+    wuffs_png__decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_png__decoder__decode_frame(
+    wuffs_png__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_png__decoder__frame_dirty_rect(
+    const wuffs_png__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_png__decoder__num_animation_loops(
+    const wuffs_png__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_png__decoder__num_decoded_frame_configs(
+    const wuffs_png__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_png__decoder__num_decoded_frames(
+    const wuffs_png__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_png__decoder__restart_frame(
+    wuffs_png__decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_png__decoder__set_report_metadata(
+    wuffs_png__decoder* self,
+    uint32_t a_fourcc,
+    bool a_report);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_png__decoder__tell_me_more(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_png__decoder__workbuf_len(
+    const wuffs_png__decoder* self);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_png__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__image_decoder;
+    wuffs_base__vtable null_vtable;
+
+    uint32_t f_width;
+    uint32_t f_height;
+    uint64_t f_pass_bytes_per_row;
+    uint64_t f_workbuf_wi;
+    uint64_t f_workbuf_hist_pos_base;
+    uint64_t f_overall_workbuf_length;
+    uint64_t f_pass_workbuf_length;
+    uint8_t f_call_sequence;
+    bool f_report_metadata_chrm;
+    bool f_report_metadata_gama;
+    bool f_report_metadata_iccp;
+    bool f_report_metadata_kvp;
+    bool f_report_metadata_srgb;
+    bool f_ignore_checksum;
+    uint8_t f_depth;
+    uint8_t f_color_type;
+    uint8_t f_filter_distance;
+    uint8_t f_interlace_pass;
+    bool f_seen_actl;
+    bool f_seen_chrm;
+    bool f_seen_fctl;
+    bool f_seen_gama;
+    bool f_seen_iccp;
+    bool f_seen_idat;
+    bool f_seen_plte;
+    bool f_seen_srgb;
+    bool f_seen_trns;
+    bool f_metadata_is_zlib_compressed;
+    bool f_zlib_is_dirty;
+    uint32_t f_chunk_type;
+    uint8_t f_chunk_type_array[4];
+    uint32_t f_chunk_length;
+    uint64_t f_remap_transparency;
+    uint32_t f_dst_pixfmt;
+    uint32_t f_src_pixfmt;
+    uint32_t f_num_animation_frames_value;
+    uint32_t f_num_animation_loops_value;
+    uint32_t f_num_decoded_frame_configs_value;
+    uint32_t f_num_decoded_frames_value;
+    uint32_t f_frame_rect_x0;
+    uint32_t f_frame_rect_y0;
+    uint32_t f_frame_rect_x1;
+    uint32_t f_frame_rect_y1;
+    uint32_t f_first_rect_x0;
+    uint32_t f_first_rect_y0;
+    uint32_t f_first_rect_x1;
+    uint32_t f_first_rect_y1;
+    uint64_t f_frame_config_io_position;
+    uint64_t f_first_config_io_position;
+    uint64_t f_frame_duration;
+    uint64_t f_first_duration;
+    uint8_t f_frame_disposal;
+    uint8_t f_first_disposal;
+    bool f_frame_overwrite_instead_of_blend;
+    bool f_first_overwrite_instead_of_blend;
+    uint32_t f_next_animation_seq_num;
+    uint32_t f_metadata_flavor;
+    uint32_t f_metadata_fourcc;
+    uint64_t f_metadata_x;
+    uint64_t f_metadata_y;
+    uint64_t f_metadata_z;
+    uint32_t f_ztxt_ri;
+    uint32_t f_ztxt_wi;
+    uint64_t f_ztxt_hist_pos;
+    wuffs_base__pixel_swizzler f_swizzler;
+
+    wuffs_base__empty_struct (*choosy_filter_1)(
+        wuffs_png__decoder* self,
+        wuffs_base__slice_u8 a_curr);
+    wuffs_base__empty_struct (*choosy_filter_3)(
+        wuffs_png__decoder* self,
+        wuffs_base__slice_u8 a_curr,
+        wuffs_base__slice_u8 a_prev);
+    wuffs_base__empty_struct (*choosy_filter_4)(
+        wuffs_png__decoder* self,
+        wuffs_base__slice_u8 a_curr,
+        wuffs_base__slice_u8 a_prev);
+    uint32_t p_decode_image_config[1];
+    uint32_t p_decode_ihdr[1];
+    uint32_t p_decode_other_chunk[1];
+    uint32_t p_decode_actl[1];
+    uint32_t p_decode_chrm[1];
+    uint32_t p_decode_fctl[1];
+    uint32_t p_decode_gama[1];
+    uint32_t p_decode_iccp[1];
+    uint32_t p_decode_plte[1];
+    uint32_t p_decode_srgb[1];
+    uint32_t p_decode_trns[1];
+    uint32_t p_decode_frame_config[1];
+    uint32_t p_skip_frame[1];
+    uint32_t p_decode_frame[1];
+    uint32_t p_decode_pass[1];
+    uint32_t p_tell_me_more[1];
+    wuffs_base__status (*choosy_filter_and_swizzle)(
+        wuffs_png__decoder* self,
+        wuffs_base__pixel_buffer* a_dst,
+        wuffs_base__slice_u8 a_workbuf);
+  } private_impl;
+
+  struct {
+    wuffs_crc32__ieee_hasher f_crc32;
+    wuffs_zlib__decoder f_zlib;
+    uint8_t f_dst_palette[1024];
+    uint8_t f_src_palette[1024];
+
+    struct {
+      uint32_t v_checksum_have;
+      uint64_t scratch;
+    } s_decode_image_config[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_ihdr[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_other_chunk[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_actl[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_chrm[1];
+    struct {
+      uint32_t v_x0;
+      uint32_t v_x1;
+      uint32_t v_y1;
+      uint64_t scratch;
+    } s_decode_fctl[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_gama[1];
+    struct {
+      uint32_t v_num_entries;
+      uint32_t v_i;
+      uint64_t scratch;
+    } s_decode_plte[1];
+    struct {
+      uint32_t v_i;
+      uint32_t v_n;
+      uint64_t scratch;
+    } s_decode_trns[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_frame_config[1];
+    struct {
+      uint64_t scratch;
+    } s_skip_frame[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_frame[1];
+    struct {
+      uint64_t scratch;
+    } s_decode_pass[1];
+    struct {
+      wuffs_base__status v_zlib_status;
+      uint64_t scratch;
+    } s_tell_me_more[1];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_png__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_png__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__image_decoder::unique_ptr
+  alloc_as__wuffs_base__image_decoder() {
+    return wuffs_base__image_decoder::unique_ptr(
+        wuffs_png__decoder__alloc_as__wuffs_base__image_decoder(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_png__decoder__struct() = delete;
+  wuffs_png__decoder__struct(const wuffs_png__decoder__struct&) = delete;
+  wuffs_png__decoder__struct& operator=(
+      const wuffs_png__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_png__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__image_decoder*
+  upcast_as__wuffs_base__image_decoder() {
+    return (wuffs_base__image_decoder*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_png__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__status
+  decode_image_config(
+      wuffs_base__image_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_png__decoder__decode_image_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status
+  decode_frame_config(
+      wuffs_base__frame_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_png__decoder__decode_frame_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status
+  decode_frame(
+      wuffs_base__pixel_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__pixel_blend a_blend,
+      wuffs_base__slice_u8 a_workbuf,
+      wuffs_base__decode_frame_options* a_opts) {
+    return wuffs_png__decoder__decode_frame(this, a_dst, a_src, a_blend, a_workbuf, a_opts);
+  }
+
+  inline wuffs_base__rect_ie_u32
+  frame_dirty_rect() const {
+    return wuffs_png__decoder__frame_dirty_rect(this);
+  }
+
+  inline uint32_t
+  num_animation_loops() const {
+    return wuffs_png__decoder__num_animation_loops(this);
+  }
+
+  inline uint64_t
+  num_decoded_frame_configs() const {
+    return wuffs_png__decoder__num_decoded_frame_configs(this);
+  }
+
+  inline uint64_t
+  num_decoded_frames() const {
+    return wuffs_png__decoder__num_decoded_frames(this);
+  }
+
+  inline wuffs_base__status
+  restart_frame(
+      uint64_t a_index,
+      uint64_t a_io_position) {
+    return wuffs_png__decoder__restart_frame(this, a_index, a_io_position);
+  }
+
+  inline wuffs_base__empty_struct
+  set_report_metadata(
+      uint32_t a_fourcc,
+      bool a_report) {
+    return wuffs_png__decoder__set_report_metadata(this, a_fourcc, a_report);
+  }
+
+  inline wuffs_base__status
+  tell_me_more(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__more_information* a_minfo,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_png__decoder__tell_me_more(this, a_dst, a_minfo, a_src);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_png__decoder__workbuf_len(this);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_png__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+// ---------------- Status Codes
+
+extern const char wuffs_wbmp__error__bad_header[];
+
+// ---------------- Public Consts
+
+#define WUFFS_WBMP__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE 0
+
+// ---------------- Struct Declarations
+
+typedef struct wuffs_wbmp__decoder__struct wuffs_wbmp__decoder;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Public Initializer Prototypes
+
+// For any given "wuffs_foo__bar* self", "wuffs_foo__bar__initialize(self,
+// etc)" should be called before any other "wuffs_foo__bar__xxx(self, etc)".
+//
+// Pass sizeof(*self) and WUFFS_VERSION for sizeof_star_self and wuffs_version.
+// Pass 0 (or some combination of WUFFS_INITIALIZE__XXX) for options.
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_wbmp__decoder__initialize(
+    wuffs_wbmp__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options);
+
+size_t
+sizeof__wuffs_wbmp__decoder();
+
+// ---------------- Allocs
+
+// These functions allocate and initialize Wuffs structs. They return NULL if
+// memory allocation fails. If they return non-NULL, there is no need to call
+// wuffs_foo__bar__initialize, but the caller is responsible for eventually
+// calling free on the returned pointer. That pointer is effectively a C++
+// std::unique_ptr<T, decltype(&free)>.
+
+wuffs_wbmp__decoder*
+wuffs_wbmp__decoder__alloc();
+
+static inline wuffs_base__image_decoder*
+wuffs_wbmp__decoder__alloc_as__wuffs_base__image_decoder() {
+  return (wuffs_base__image_decoder*)(wuffs_wbmp__decoder__alloc());
+}
+
+// ---------------- Upcasts
+
+static inline wuffs_base__image_decoder*
+wuffs_wbmp__decoder__upcast_as__wuffs_base__image_decoder(
+    wuffs_wbmp__decoder* p) {
+  return (wuffs_base__image_decoder*)p;
+}
+
+// ---------------- Public Function Prototypes
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_wbmp__decoder__set_quirk_enabled(
+    wuffs_wbmp__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_wbmp__decoder__decode_image_config(
+    wuffs_wbmp__decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_wbmp__decoder__decode_frame_config(
+    wuffs_wbmp__decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_wbmp__decoder__decode_frame(
+    wuffs_wbmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_wbmp__decoder__frame_dirty_rect(
+    const wuffs_wbmp__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_wbmp__decoder__num_animation_loops(
+    const wuffs_wbmp__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_wbmp__decoder__num_decoded_frame_configs(
+    const wuffs_wbmp__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_wbmp__decoder__num_decoded_frames(
+    const wuffs_wbmp__decoder* self);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_wbmp__decoder__restart_frame(
+    wuffs_wbmp__decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_wbmp__decoder__set_report_metadata(
+    wuffs_wbmp__decoder* self,
+    uint32_t a_fourcc,
+    bool a_report);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_wbmp__decoder__tell_me_more(
+    wuffs_wbmp__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src);
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_wbmp__decoder__workbuf_len(
+    const wuffs_wbmp__decoder* self);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+// ---------------- Struct Definitions
+
+// These structs' fields, and the sizeof them, are private implementation
+// details that aren't guaranteed to be stable across Wuffs versions.
+//
+// See https://en.wikipedia.org/wiki/Opaque_pointer#C
+
+#if defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+struct wuffs_wbmp__decoder__struct {
+  // Do not access the private_impl's or private_data's fields directly. There
+  // is no API/ABI compatibility or safety guarantee if you do so. Instead, use
+  // the wuffs_foo__bar__baz functions.
+  //
+  // It is a struct, not a struct*, so that the outermost wuffs_foo__bar struct
+  // can be stack allocated when WUFFS_IMPLEMENTATION is defined.
+
+  struct {
+    uint32_t magic;
+    uint32_t active_coroutine;
+    wuffs_base__vtable vtable_for__wuffs_base__image_decoder;
+    wuffs_base__vtable null_vtable;
+
+    uint32_t f_width;
+    uint32_t f_height;
+    uint8_t f_call_sequence;
+    uint64_t f_frame_config_io_position;
+    wuffs_base__pixel_swizzler f_swizzler;
+
+    uint32_t p_decode_image_config[1];
+    uint32_t p_decode_frame_config[1];
+    uint32_t p_decode_frame[1];
+  } private_impl;
+
+  struct {
+    struct {
+      uint32_t v_i;
+      uint32_t v_x32;
+    } s_decode_image_config[1];
+    struct {
+      uint64_t v_dst_bytes_per_pixel;
+      uint32_t v_dst_x;
+      uint32_t v_dst_y;
+      uint8_t v_src[1];
+      uint8_t v_c;
+    } s_decode_frame[1];
+  } private_data;
+
+#ifdef __cplusplus
+#if defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+  using unique_ptr = std::unique_ptr<wuffs_wbmp__decoder, decltype(&free)>;
+
+  // On failure, the alloc_etc functions return nullptr. They don't throw.
+
+  static inline unique_ptr
+  alloc() {
+    return unique_ptr(wuffs_wbmp__decoder__alloc(), &free);
+  }
+
+  static inline wuffs_base__image_decoder::unique_ptr
+  alloc_as__wuffs_base__image_decoder() {
+    return wuffs_base__image_decoder::unique_ptr(
+        wuffs_wbmp__decoder__alloc_as__wuffs_base__image_decoder(), &free);
+  }
+#endif  // defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#if defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+  // Disallow constructing or copying an object via standard C++ mechanisms,
+  // e.g. the "new" operator, as this struct is intentionally opaque. Its total
+  // size and field layout is not part of the public, stable, memory-safe API.
+  // Use malloc or memcpy and the sizeof__wuffs_foo__bar function instead, and
+  // call wuffs_foo__bar__baz methods (which all take a "this"-like pointer as
+  // their first argument) rather than tweaking bar.private_impl.qux fields.
+  //
+  // In C, we can just leave wuffs_foo__bar as an incomplete type (unless
+  // WUFFS_IMPLEMENTATION is #define'd). In C++, we define a complete type in
+  // order to provide convenience methods. These forward on "this", so that you
+  // can write "bar->baz(etc)" instead of "wuffs_foo__bar__baz(bar, etc)".
+  wuffs_wbmp__decoder__struct() = delete;
+  wuffs_wbmp__decoder__struct(const wuffs_wbmp__decoder__struct&) = delete;
+  wuffs_wbmp__decoder__struct& operator=(
+      const wuffs_wbmp__decoder__struct&) = delete;
+#endif  // defined(WUFFS_BASE__HAVE_EQ_DELETE) && !defined(WUFFS_IMPLEMENTATION)
+
+#if !defined(WUFFS_IMPLEMENTATION)
+  // As above, the size of the struct is not part of the public API, and unless
+  // WUFFS_IMPLEMENTATION is #define'd, this struct type T should be heap
+  // allocated, not stack allocated. Its size is not intended to be known at
+  // compile time, but it is unfortunately divulged as a side effect of
+  // defining C++ convenience methods. Use "sizeof__T()", calling the function,
+  // instead of "sizeof T", invoking the operator. To make the two values
+  // different, so that passing the latter will be rejected by the initialize
+  // function, we add an arbitrary amount of dead weight.
+  uint8_t dead_weight[123000000];  // 123 MB.
+#endif  // !defined(WUFFS_IMPLEMENTATION)
+
+  inline wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+  initialize(
+      size_t sizeof_star_self,
+      uint64_t wuffs_version,
+      uint32_t options) {
+    return wuffs_wbmp__decoder__initialize(
+        this, sizeof_star_self, wuffs_version, options);
+  }
+
+  inline wuffs_base__image_decoder*
+  upcast_as__wuffs_base__image_decoder() {
+    return (wuffs_base__image_decoder*)this;
+  }
+
+  inline wuffs_base__empty_struct
+  set_quirk_enabled(
+      uint32_t a_quirk,
+      bool a_enabled) {
+    return wuffs_wbmp__decoder__set_quirk_enabled(this, a_quirk, a_enabled);
+  }
+
+  inline wuffs_base__status
+  decode_image_config(
+      wuffs_base__image_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_wbmp__decoder__decode_image_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status
+  decode_frame_config(
+      wuffs_base__frame_config* a_dst,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_wbmp__decoder__decode_frame_config(this, a_dst, a_src);
+  }
+
+  inline wuffs_base__status
+  decode_frame(
+      wuffs_base__pixel_buffer* a_dst,
+      wuffs_base__io_buffer* a_src,
+      wuffs_base__pixel_blend a_blend,
+      wuffs_base__slice_u8 a_workbuf,
+      wuffs_base__decode_frame_options* a_opts) {
+    return wuffs_wbmp__decoder__decode_frame(this, a_dst, a_src, a_blend, a_workbuf, a_opts);
+  }
+
+  inline wuffs_base__rect_ie_u32
+  frame_dirty_rect() const {
+    return wuffs_wbmp__decoder__frame_dirty_rect(this);
+  }
+
+  inline uint32_t
+  num_animation_loops() const {
+    return wuffs_wbmp__decoder__num_animation_loops(this);
+  }
+
+  inline uint64_t
+  num_decoded_frame_configs() const {
+    return wuffs_wbmp__decoder__num_decoded_frame_configs(this);
+  }
+
+  inline uint64_t
+  num_decoded_frames() const {
+    return wuffs_wbmp__decoder__num_decoded_frames(this);
+  }
+
+  inline wuffs_base__status
+  restart_frame(
+      uint64_t a_index,
+      uint64_t a_io_position) {
+    return wuffs_wbmp__decoder__restart_frame(this, a_index, a_io_position);
+  }
+
+  inline wuffs_base__empty_struct
+  set_report_metadata(
+      uint32_t a_fourcc,
+      bool a_report) {
+    return wuffs_wbmp__decoder__set_report_metadata(this, a_fourcc, a_report);
+  }
+
+  inline wuffs_base__status
+  tell_me_more(
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__more_information* a_minfo,
+      wuffs_base__io_buffer* a_src) {
+    return wuffs_wbmp__decoder__tell_me_more(this, a_dst, a_minfo, a_src);
+  }
+
+  inline wuffs_base__range_ii_u64
+  workbuf_len() const {
+    return wuffs_wbmp__decoder__workbuf_len(this);
+  }
+
+#endif  // __cplusplus
+};  // struct wuffs_wbmp__decoder__struct
+
+#endif  // defined(__cplusplus) || defined(WUFFS_IMPLEMENTATION)
+
+#if defined(__cplusplus) && defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+// ---------------- Auxiliary - Base
+
+// Auxiliary code is discussed at
+// https://github.com/google/wuffs/blob/main/doc/note/auxiliary-code.md
+
+#include <stdio.h>
+
+#include <string>
+
+namespace wuffs_aux {
+
+using IOBuffer = wuffs_base__io_buffer;
+
+// MemOwner represents ownership of some memory. Dynamically allocated memory
+// (e.g. from malloc or new) is typically paired with free or delete, invoked
+// when the std::unique_ptr is destroyed. Statically allocated memory might use
+// MemOwner(nullptr, &free), even if that statically allocated memory is not
+// nullptr, since calling free(nullptr) is a no-op.
+using MemOwner = std::unique_ptr<void, decltype(&free)>;
+
+namespace sync_io {
+
+// --------
+
+// DynIOBuffer is an IOBuffer that is backed by a dynamically sized byte array.
+// It owns that backing array and will free it in its destructor.
+//
+// The array size can be explicitly extended (by calling the grow method) but,
+// unlike a C++ std::vector, there is no implicit extension (e.g. by calling
+// std::vector::insert) and its maximum size is capped by the max_incl
+// constructor argument.
+//
+// It contains an IOBuffer-typed field whose reader side provides access to
+// previously written bytes and whose writer side provides access to the
+// allocated but not-yet-written-to slack space. For Go programmers, this slack
+// space is roughly analogous to the s[len(s):cap(s)] space of a slice s.
+class DynIOBuffer {
+ public:
+  enum GrowResult {
+    OK = 0,
+    FailedMaxInclExceeded = 1,
+    FailedOutOfMemory = 2,
+  };
+
+  // m_buf holds the dynamically sized byte array and its read/write indexes:
+  //  - m_buf.meta.wi  is roughly analogous to a Go slice's length.
+  //  - m_buf.data.len is roughly analogous to a Go slice's capacity. It is
+  //    also equal to the m_buf.data.ptr malloc/realloc size.
+  //
+  // Users should not modify the m_buf.data.ptr or m_buf.data.len fields (as
+  // they are conceptually private to this class), but they can modify the
+  // bytes referenced by that pointer-length pair (e.g. compactions).
+  IOBuffer m_buf;
+
+  // m_max_incl is an inclusive upper bound on the backing array size.
+  const uint64_t m_max_incl;
+
+  // Constructor and destructor.
+  explicit DynIOBuffer(uint64_t max_incl);
+  ~DynIOBuffer();
+
+  // Drop frees the byte array and resets m_buf. The DynIOBuffer can still be
+  // used after a drop call. It just restarts from zero.
+  void drop();
+
+  // grow ensures that the byte array size is at least min_incl and at most
+  // max_incl. It returns FailedMaxInclExceeded if that would require
+  // allocating more than max_incl bytes, including the case where (min_incl >
+  // max_incl). It returns FailedOutOfMemory if memory allocation failed.
+  GrowResult grow(uint64_t min_incl);
+
+ private:
+  // Delete the copy and assign constructors.
+  DynIOBuffer(const DynIOBuffer&) = delete;
+  DynIOBuffer& operator=(const DynIOBuffer&) = delete;
+
+  static uint64_t round_up(uint64_t min_incl, uint64_t max_incl);
+};
+
+// --------
+
+class Input {
+ public:
+  virtual ~Input();
+
+  virtual IOBuffer* BringsItsOwnIOBuffer();
+  virtual std::string CopyIn(IOBuffer* dst) = 0;
+};
+
+// --------
+
+// FileInput is an Input that reads from a file source.
+//
+// It does not take responsibility for closing the file when done.
+class FileInput : public Input {
+ public:
+  FileInput(FILE* f);
+
+  virtual std::string CopyIn(IOBuffer* dst);
+
+ private:
+  FILE* m_f;
+
+  // Delete the copy and assign constructors.
+  FileInput(const FileInput&) = delete;
+  FileInput& operator=(const FileInput&) = delete;
+};
+
+// --------
+
+// MemoryInput is an Input that reads from an in-memory source.
+//
+// It does not take responsibility for freeing the memory when done.
+class MemoryInput : public Input {
+ public:
+  MemoryInput(const char* ptr, size_t len);
+  MemoryInput(const uint8_t* ptr, size_t len);
+
+  virtual IOBuffer* BringsItsOwnIOBuffer();
+  virtual std::string CopyIn(IOBuffer* dst);
+
+ private:
+  IOBuffer m_io;
+
+  // Delete the copy and assign constructors.
+  MemoryInput(const MemoryInput&) = delete;
+  MemoryInput& operator=(const MemoryInput&) = delete;
+};
+
+// --------
+
+}  // namespace sync_io
+
+}  // namespace wuffs_aux
+
+// ---------------- Auxiliary - CBOR
+
+namespace wuffs_aux {
+
+struct DecodeCborResult {
+  DecodeCborResult(std::string&& error_message0, uint64_t cursor_position0);
+
+  std::string error_message;
+  uint64_t cursor_position;
+};
+
+class DecodeCborCallbacks {
+ public:
+  virtual ~DecodeCborCallbacks();
+
+  // AppendXxx are called for leaf nodes: literals, numbers, strings, etc.
+
+  virtual std::string AppendNull() = 0;
+  virtual std::string AppendUndefined() = 0;
+  virtual std::string AppendBool(bool val) = 0;
+  virtual std::string AppendF64(double val) = 0;
+  virtual std::string AppendI64(int64_t val) = 0;
+  virtual std::string AppendU64(uint64_t val) = 0;
+  virtual std::string AppendByteString(std::string&& val) = 0;
+  virtual std::string AppendTextString(std::string&& val) = 0;
+  virtual std::string AppendMinus1MinusX(uint64_t val) = 0;
+  virtual std::string AppendCborSimpleValue(uint8_t val) = 0;
+  virtual std::string AppendCborTag(uint64_t val) = 0;
+
+  // Push and Pop are called for container nodes: CBOR arrays (lists) and CBOR
+  // maps (dictionaries).
+  //
+  // The flags bits combine exactly one of:
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_NONE
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_LIST
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_DICT
+  // and exactly one of:
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_NONE
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_LIST
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_DICT
+
+  virtual std::string Push(uint32_t flags) = 0;
+  virtual std::string Pop(uint32_t flags) = 0;
+
+  // Done is always the last Callback method called by DecodeCbor, whether or
+  // not parsing the input as CBOR encountered an error. Even when successful,
+  // trailing data may remain in input and buffer.
+  //
+  // Do not keep a reference to buffer or buffer.data.ptr after Done returns,
+  // as DecodeCbor may then de-allocate the backing array.
+  //
+  // The default Done implementation is a no-op.
+  virtual void  //
+  Done(DecodeCborResult& result, sync_io::Input& input, IOBuffer& buffer);
+};
+
+// The FooArgBar types add structure to Foo's optional arguments. They wrap
+// inner representations for several reasons:
+//  - It provides a home for the DefaultValue static method, for Foo callers
+//    that want to override some but not all optional arguments.
+//  - It provides the "Bar" name at Foo call sites, which can help self-
+//    document Foo calls with many arguemnts.
+//  - It provides some type safety against accidentally transposing or omitting
+//    adjacent fundamentally-numeric-typed optional arguments.
+
+// DecodeCborArgQuirks wraps an optional argument to DecodeCbor.
+struct DecodeCborArgQuirks {
+  explicit DecodeCborArgQuirks(wuffs_base__slice_u32 repr0);
+  explicit DecodeCborArgQuirks(uint32_t* ptr, size_t len);
+
+  // DefaultValue returns an empty slice.
+  static DecodeCborArgQuirks DefaultValue();
+
+  wuffs_base__slice_u32 repr;
+};
+
+// DecodeCbor calls callbacks based on the CBOR-formatted data in input.
+//
+// On success, the returned error_message is empty and cursor_position counts
+// the number of bytes consumed. On failure, error_message is non-empty and
+// cursor_position is the location of the error. That error may be a content
+// error (invalid CBOR) or an input error (e.g. network failure).
+DecodeCborResult  //
+DecodeCbor(DecodeCborCallbacks& callbacks,
+           sync_io::Input& input,
+           DecodeCborArgQuirks quirks = DecodeCborArgQuirks::DefaultValue());
+
+}  // namespace wuffs_aux
+
+// ---------------- Auxiliary - Image
+
+namespace wuffs_aux {
+
+struct DecodeImageResult {
+  DecodeImageResult(MemOwner&& pixbuf_mem_owner0,
+                    wuffs_base__pixel_buffer pixbuf0,
+                    std::string&& error_message0);
+  DecodeImageResult(std::string&& error_message0);
+
+  MemOwner pixbuf_mem_owner;
+  wuffs_base__pixel_buffer pixbuf;
+  std::string error_message;
+};
+
+// DecodeImageCallbacks are the callbacks given to DecodeImage. They are always
+// called in this order:
+//  1. SelectDecoder
+//  2. HandleMetadata
+//  3. SelectPixfmt
+//  4. AllocPixbuf
+//  5. AllocWorkbuf
+//  6. Done
+//
+// It may return early - the third callback might not be invoked if the second
+// one fails - but the final callback (Done) is always invoked.
+class DecodeImageCallbacks {
+ public:
+  // AllocPixbufResult holds a memory allocation (the result of malloc or new,
+  // a statically allocated pointer, etc), or an error message. The memory is
+  // de-allocated when mem_owner goes out of scope and is destroyed.
+  struct AllocPixbufResult {
+    AllocPixbufResult(MemOwner&& mem_owner0, wuffs_base__pixel_buffer pixbuf0);
+    AllocPixbufResult(std::string&& error_message0);
+
+    MemOwner mem_owner;
+    wuffs_base__pixel_buffer pixbuf;
+    std::string error_message;
+  };
+
+  // AllocWorkbufResult holds a memory allocation (the result of malloc or new,
+  // a statically allocated pointer, etc), or an error message. The memory is
+  // de-allocated when mem_owner goes out of scope and is destroyed.
+  struct AllocWorkbufResult {
+    AllocWorkbufResult(MemOwner&& mem_owner0, wuffs_base__slice_u8 workbuf0);
+    AllocWorkbufResult(std::string&& error_message0);
+
+    MemOwner mem_owner;
+    wuffs_base__slice_u8 workbuf;
+    std::string error_message;
+  };
+
+  virtual ~DecodeImageCallbacks();
+
+  // SelectDecoder returns the image decoder for the input data's file format.
+  // Returning a nullptr means failure (DecodeImage_UnsupportedImageFormat).
+  //
+  // Common formats will have a FourCC value in the range [1 ..= 0x7FFF_FFFF],
+  // such as WUFFS_BASE__FOURCC__JPEG. A zero FourCC value means that the
+  // caller is responsible for examining the opening bytes (a prefix) of the
+  // input data. SelectDecoder implementations should not modify those bytes.
+  //
+  // SelectDecoder might be called more than once, since some image file
+  // formats can wrap others. For example, a nominal BMP file can actually
+  // contain a JPEG or a PNG.
+  //
+  // The default SelectDecoder accepts the FOURCC codes listed below. For
+  // modular builds (i.e. when #define'ing WUFFS_CONFIG__MODULES), acceptance
+  // of the ETC file format is optional (for each value of ETC) and depends on
+  // the corresponding module to be enabled at compile time (i.e. #define'ing
+  // WUFFS_CONFIG__MODULE__ETC).
+  //  - WUFFS_BASE__FOURCC__BMP
+  //  - WUFFS_BASE__FOURCC__GIF
+  //  - WUFFS_BASE__FOURCC__NIE
+  //  - WUFFS_BASE__FOURCC__PNG
+  //  - WUFFS_BASE__FOURCC__WBMP
+  virtual wuffs_base__image_decoder::unique_ptr  //
+  SelectDecoder(uint32_t fourcc, wuffs_base__slice_u8 prefix);
+
+  // HandleMetadata acknowledges image metadata. minfo.flavor will be one of:
+  //  - WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_PASSTHROUGH
+  //  - WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_PARSED
+  // If it is ETC__METADATA_RAW_ETC then raw contains the metadata bytes. Those
+  // bytes should not be retained beyond the the HandleMetadata call.
+  //
+  // minfo.metadata__fourcc() will typically match one of the
+  // DecodeImageArgFlags bits. For example, if (REPORT_METADATA_CHRM |
+  // REPORT_METADATA_GAMA) was passed to DecodeImage then the metadata FourCC
+  // will be either WUFFS_BASE__FOURCC__CHRM or WUFFS_BASE__FOURCC__GAMA.
+  //
+  // It returns an error message, or an empty string on success.
+  virtual std::string  //
+  HandleMetadata(const wuffs_base__more_information& minfo,
+                 wuffs_base__slice_u8 raw);
+
+  // SelectPixfmt returns the destination pixel format for AllocPixbuf. It
+  // should return wuffs_base__make_pixel_format(etc) called with one of:
+  //  - WUFFS_BASE__PIXEL_FORMAT__BGR_565
+  //  - WUFFS_BASE__PIXEL_FORMAT__BGR
+  //  - WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL
+  //  - WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE
+  //  - WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL
+  //  - WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL
+  //  - WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL
+  // or return image_config.pixcfg.pixel_format(). The latter means to use the
+  // image file's natural pixel format. For example, GIF images' natural pixel
+  // format is an indexed one.
+  //
+  // Returning otherwise means failure (DecodeImage_UnsupportedPixelFormat).
+  //
+  // The default SelectPixfmt implementation returns
+  // wuffs_base__make_pixel_format(WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL) which
+  // is 4 bytes per pixel (8 bits per channel × 4 channels).
+  virtual wuffs_base__pixel_format  //
+  SelectPixfmt(const wuffs_base__image_config& image_config);
+
+  // AllocPixbuf allocates the pixel buffer.
+  //
+  // allow_uninitialized_memory will be true if a valid background_color was
+  // passed to DecodeImage, since the pixel buffer's contents will be
+  // overwritten with that color after AllocPixbuf returns.
+  //
+  // The default AllocPixbuf implementation allocates either uninitialized or
+  // zeroed memory. Zeroed memory typically corresponds to filling with opaque
+  // black or transparent black, depending on the pixel format.
+  virtual AllocPixbufResult  //
+  AllocPixbuf(const wuffs_base__image_config& image_config,
+              bool allow_uninitialized_memory);
+
+  // AllocWorkbuf allocates the work buffer. The allocated buffer's length
+  // should be at least len_range.min_incl, but larger allocations (up to
+  // len_range.max_incl) may have better performance (by using more memory).
+  //
+  // The default AllocWorkbuf implementation allocates len_range.max_incl bytes
+  // of either uninitialized or zeroed memory.
+  virtual AllocWorkbufResult  //
+  AllocWorkbuf(wuffs_base__range_ii_u64 len_range,
+               bool allow_uninitialized_memory);
+
+  // Done is always the last Callback method called by DecodeImage, whether or
+  // not parsing the input encountered an error. Even when successful, trailing
+  // data may remain in input and buffer.
+  //
+  // The image_decoder is the one returned by SelectDecoder (if SelectDecoder
+  // was successful), or a no-op unique_ptr otherwise. Like any unique_ptr,
+  // ownership moves to the Done implementation.
+  //
+  // Do not keep a reference to buffer or buffer.data.ptr after Done returns,
+  // as DecodeImage may then de-allocate the backing array.
+  //
+  // The default Done implementation is a no-op, other than running the
+  // image_decoder unique_ptr destructor.
+  virtual void  //
+  Done(DecodeImageResult& result,
+       sync_io::Input& input,
+       IOBuffer& buffer,
+       wuffs_base__image_decoder::unique_ptr image_decoder);
+};
+
+extern const char DecodeImage_BufferIsTooShort[];
+extern const char DecodeImage_MaxInclDimensionExceeded[];
+extern const char DecodeImage_MaxInclMetadataLengthExceeded[];
+extern const char DecodeImage_OutOfMemory[];
+extern const char DecodeImage_UnexpectedEndOfFile[];
+extern const char DecodeImage_UnsupportedImageFormat[];
+extern const char DecodeImage_UnsupportedMetadata[];
+extern const char DecodeImage_UnsupportedPixelBlend[];
+extern const char DecodeImage_UnsupportedPixelConfiguration[];
+extern const char DecodeImage_UnsupportedPixelFormat[];
+
+// The FooArgBar types add structure to Foo's optional arguments. They wrap
+// inner representations for several reasons:
+//  - It provides a home for the DefaultValue static method, for Foo callers
+//    that want to override some but not all optional arguments.
+//  - It provides the "Bar" name at Foo call sites, which can help self-
+//    document Foo calls with many arguemnts.
+//  - It provides some type safety against accidentally transposing or omitting
+//    adjacent fundamentally-numeric-typed optional arguments.
+
+// DecodeImageArgQuirks wraps an optional argument to DecodeImage.
+struct DecodeImageArgQuirks {
+  explicit DecodeImageArgQuirks(wuffs_base__slice_u32 repr0);
+  explicit DecodeImageArgQuirks(uint32_t* ptr, size_t len);
+
+  // DefaultValue returns an empty slice.
+  static DecodeImageArgQuirks DefaultValue();
+
+  wuffs_base__slice_u32 repr;
+};
+
+// DecodeImageArgFlags wraps an optional argument to DecodeImage.
+struct DecodeImageArgFlags {
+  explicit DecodeImageArgFlags(uint64_t repr0);
+
+  // DefaultValue returns 0.
+  static DecodeImageArgFlags DefaultValue();
+
+  // TODO: support all of the REPORT_METADATA_ETC flags, not just CHRM, GAMA,
+  // ICCP, KVP, SRGB and XMP.
+
+  // Background Color.
+  static constexpr uint64_t REPORT_METADATA_BGCL = 0x0001;
+  // Primary Chromaticities and White Point.
+  static constexpr uint64_t REPORT_METADATA_CHRM = 0x0002;
+  // Exchangeable Image File Format.
+  static constexpr uint64_t REPORT_METADATA_EXIF = 0x0004;
+  // Gamma Correction.
+  static constexpr uint64_t REPORT_METADATA_GAMA = 0x0008;
+  // International Color Consortium Profile.
+  static constexpr uint64_t REPORT_METADATA_ICCP = 0x0010;
+  // Key-Value Pair.
+  //
+  // For PNG files, this includes iTXt, tEXt and zTXt chunks. In the
+  // HandleMetadata callback, the raw argument contains UTF-8 strings.
+  static constexpr uint64_t REPORT_METADATA_KVP = 0x0020;
+  // Modification Time.
+  static constexpr uint64_t REPORT_METADATA_MTIM = 0x0040;
+  // Offset (2-Dimensional).
+  static constexpr uint64_t REPORT_METADATA_OFS2 = 0x0080;
+  // Physical Dimensions.
+  static constexpr uint64_t REPORT_METADATA_PHYD = 0x0100;
+  // Standard Red Green Blue (Rendering Intent).
+  static constexpr uint64_t REPORT_METADATA_SRGB = 0x0200;
+  // Extensible Metadata Platform.
+  static constexpr uint64_t REPORT_METADATA_XMP = 0x0400;
+
+  uint64_t repr;
+};
+
+// DecodeImageArgPixelBlend wraps an optional argument to DecodeImage.
+struct DecodeImageArgPixelBlend {
+  explicit DecodeImageArgPixelBlend(wuffs_base__pixel_blend repr0);
+
+  // DefaultValue returns WUFFS_BASE__PIXEL_BLEND__SRC.
+  static DecodeImageArgPixelBlend DefaultValue();
+
+  wuffs_base__pixel_blend repr;
+};
+
+// DecodeImageArgBackgroundColor wraps an optional argument to DecodeImage.
+struct DecodeImageArgBackgroundColor {
+  explicit DecodeImageArgBackgroundColor(
+      wuffs_base__color_u32_argb_premul repr0);
+
+  // DefaultValue returns 1, an invalid wuffs_base__color_u32_argb_premul.
+  static DecodeImageArgBackgroundColor DefaultValue();
+
+  wuffs_base__color_u32_argb_premul repr;
+};
+
+// DecodeImageArgMaxInclDimension wraps an optional argument to DecodeImage.
+struct DecodeImageArgMaxInclDimension {
+  explicit DecodeImageArgMaxInclDimension(uint32_t repr0);
+
+  // DefaultValue returns 1048575 = 0x000F_FFFF, more than 1 million pixels.
+  static DecodeImageArgMaxInclDimension DefaultValue();
+
+  uint32_t repr;
+};
+
+// DecodeImageArgMaxInclMetadataLength wraps an optional argument to
+// DecodeImage.
+struct DecodeImageArgMaxInclMetadataLength {
+  explicit DecodeImageArgMaxInclMetadataLength(uint64_t repr0);
+
+  // DefaultValue returns 16777215 = 0x00FF_FFFF, one less than 16 MiB.
+  static DecodeImageArgMaxInclMetadataLength DefaultValue();
+
+  uint64_t repr;
+};
+
+// DecodeImage decodes the image data in input. A variety of image file formats
+// can be decoded, depending on what callbacks.SelectDecoder returns.
+//
+// For animated formats, only the first frame is returned, since the API is
+// simpler for synchronous I/O and having DecodeImage only return when
+// completely done, but rendering animation often involves handling other
+// events in between animation frames. To decode multiple frames of animated
+// images, or for asynchronous I/O (e.g. when decoding an image streamed over
+// the network), use Wuffs' lower level C API instead of its higher level,
+// simplified C++ API (the wuffs_aux API).
+//
+// The DecodeImageResult's fields depend on whether decoding succeeded:
+//  - On total success, the error_message is empty and pixbuf.pixcfg.is_valid()
+//    is true.
+//  - On partial success (e.g. the input file was truncated but we are still
+//    able to decode some of the pixels), error_message is non-empty but
+//    pixbuf.pixcfg.is_valid() is still true. It is up to the caller whether to
+//    accept or reject partial success.
+//  - On failure, the error_message is non_empty and pixbuf.pixcfg.is_valid()
+//    is false.
+//
+// The callbacks allocate the pixel buffer memory and work buffer memory. On
+// success, pixel buffer memory ownership is passed to the DecodeImage caller
+// as the returned pixbuf_mem_owner. Regardless of success or failure, the work
+// buffer memory is deleted.
+//
+// The pixel_blend (one of the constants listed below) determines how to
+// composite the decoded image over the pixel buffer's original pixels (as
+// returned by callbacks.AllocPixbuf):
+//  - WUFFS_BASE__PIXEL_BLEND__SRC
+//  - WUFFS_BASE__PIXEL_BLEND__SRC_OVER
+//
+// The background_color is used to fill the pixel buffer after
+// callbacks.AllocPixbuf returns, if it is valid in the
+// wuffs_base__color_u32_argb_premul__is_valid sense. The default value,
+// 0x0000_0001, is not valid since its Blue channel value (0x01) is greater
+// than its Alpha channel value (0x00). A valid background_color will typically
+// be overwritten when pixel_blend is WUFFS_BASE__PIXEL_BLEND__SRC, but might
+// still be visible on partial (not total) success or when pixel_blend is
+// WUFFS_BASE__PIXEL_BLEND__SRC_OVER and the decoded image is not fully opaque.
+//
+// Decoding fails (with DecodeImage_MaxInclDimensionExceeded) if the image's
+// width or height is greater than max_incl_dimension or if any opted-in (via
+// flags bits) metadata is longer than max_incl_metadata_length.
+DecodeImageResult  //
+DecodeImage(DecodeImageCallbacks& callbacks,
+            sync_io::Input& input,
+            DecodeImageArgQuirks quirks = DecodeImageArgQuirks::DefaultValue(),
+            DecodeImageArgFlags flags = DecodeImageArgFlags::DefaultValue(),
+            DecodeImageArgPixelBlend pixel_blend =
+                DecodeImageArgPixelBlend::DefaultValue(),
+            DecodeImageArgBackgroundColor background_color =
+                DecodeImageArgBackgroundColor::DefaultValue(),
+            DecodeImageArgMaxInclDimension max_incl_dimension =
+                DecodeImageArgMaxInclDimension::DefaultValue(),
+            DecodeImageArgMaxInclMetadataLength max_incl_metadata_length =
+                DecodeImageArgMaxInclMetadataLength::DefaultValue());
+
+}  // namespace wuffs_aux
+
+// ---------------- Auxiliary - JSON
+
+namespace wuffs_aux {
+
+struct DecodeJsonResult {
+  DecodeJsonResult(std::string&& error_message0, uint64_t cursor_position0);
+
+  std::string error_message;
+  uint64_t cursor_position;
+};
+
+class DecodeJsonCallbacks {
+ public:
+  virtual ~DecodeJsonCallbacks();
+
+  // AppendXxx are called for leaf nodes: literals, numbers and strings. For
+  // strings, the Callbacks implementation is responsible for tracking map keys
+  // versus other values.
+
+  virtual std::string AppendNull() = 0;
+  virtual std::string AppendBool(bool val) = 0;
+  virtual std::string AppendF64(double val) = 0;
+  virtual std::string AppendI64(int64_t val) = 0;
+  virtual std::string AppendTextString(std::string&& val) = 0;
+
+  // Push and Pop are called for container nodes: JSON arrays (lists) and JSON
+  // objects (dictionaries).
+  //
+  // The flags bits combine exactly one of:
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_NONE
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_LIST
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__FROM_DICT
+  // and exactly one of:
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_NONE
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_LIST
+  //  - WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_DICT
+
+  virtual std::string Push(uint32_t flags) = 0;
+  virtual std::string Pop(uint32_t flags) = 0;
+
+  // Done is always the last Callback method called by DecodeJson, whether or
+  // not parsing the input as JSON encountered an error. Even when successful,
+  // trailing data may remain in input and buffer. See "Unintuitive JSON
+  // Parsing" (https://nullprogram.com/blog/2019/12/28/) which discusses JSON
+  // parsing and when it stops.
+  //
+  // Do not keep a reference to buffer or buffer.data.ptr after Done returns,
+  // as DecodeJson may then de-allocate the backing array.
+  //
+  // The default Done implementation is a no-op.
+  virtual void  //
+  Done(DecodeJsonResult& result, sync_io::Input& input, IOBuffer& buffer);
+};
+
+extern const char DecodeJson_BadJsonPointer[];
+extern const char DecodeJson_NoMatch[];
+
+// The FooArgBar types add structure to Foo's optional arguments. They wrap
+// inner representations for several reasons:
+//  - It provides a home for the DefaultValue static method, for Foo callers
+//    that want to override some but not all optional arguments.
+//  - It provides the "Bar" name at Foo call sites, which can help self-
+//    document Foo calls with many arguemnts.
+//  - It provides some type safety against accidentally transposing or omitting
+//    adjacent fundamentally-numeric-typed optional arguments.
+
+// DecodeJsonArgQuirks wraps an optional argument to DecodeJson.
+struct DecodeJsonArgQuirks {
+  explicit DecodeJsonArgQuirks(wuffs_base__slice_u32 repr0);
+  explicit DecodeJsonArgQuirks(uint32_t* ptr, size_t len);
+
+  // DefaultValue returns an empty slice.
+  static DecodeJsonArgQuirks DefaultValue();
+
+  wuffs_base__slice_u32 repr;
+};
+
+// DecodeJsonArgJsonPointer wraps an optional argument to DecodeJson.
+struct DecodeJsonArgJsonPointer {
+  explicit DecodeJsonArgJsonPointer(std::string repr0);
+
+  // DefaultValue returns an empty string.
+  static DecodeJsonArgJsonPointer DefaultValue();
+
+  std::string repr;
+};
+
+// DecodeJson calls callbacks based on the JSON-formatted data in input.
+//
+// On success, the returned error_message is empty and cursor_position counts
+// the number of bytes consumed. On failure, error_message is non-empty and
+// cursor_position is the location of the error. That error may be a content
+// error (invalid JSON) or an input error (e.g. network failure).
+//
+// json_pointer is a query in the JSON Pointer (RFC 6901) syntax. The callbacks
+// run for the input's sub-node that matches the query. DecodeJson_NoMatch is
+// returned if no matching sub-node was found. The empty query matches the
+// input's root node, consistent with JSON Pointer semantics.
+//
+// The JSON Pointer implementation is greedy: duplicate keys are not rejected
+// but only the first match for each '/'-separated fragment is followed.
+DecodeJsonResult  //
+DecodeJson(DecodeJsonCallbacks& callbacks,
+           sync_io::Input& input,
+           DecodeJsonArgQuirks quirks = DecodeJsonArgQuirks::DefaultValue(),
+           DecodeJsonArgJsonPointer json_pointer =
+               DecodeJsonArgJsonPointer::DefaultValue());
+
+}  // namespace wuffs_aux
+
+#endif  // defined(__cplusplus) && defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+// ‼ WUFFS C HEADER ENDS HERE.
+#ifdef WUFFS_IMPLEMENTATION
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ---------------- Fundamentals
+
+// WUFFS_BASE__MAGIC is a magic number to check that initializers are called.
+// It's not foolproof, given C doesn't automatically zero memory before use,
+// but it should catch 99.99% of cases.
+//
+// Its (non-zero) value is arbitrary, based on md5sum("wuffs").
+#define WUFFS_BASE__MAGIC ((uint32_t)0x3CCB6C71)
+
+// WUFFS_BASE__DISABLED is a magic number to indicate that a non-recoverable
+// error was previously encountered.
+//
+// Its (non-zero) value is arbitrary, based on md5sum("disabled").
+#define WUFFS_BASE__DISABLED ((uint32_t)0x075AE3D2)
+
+// Use switch cases for coroutine suspension points, similar to the technique
+// in https://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
+//
+// The implicit fallthrough is intentional.
+//
+// We use trivial macros instead of an explicit assignment and case statement
+// so that clang-format doesn't get confused by the unusual "case"s.
+#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0 case 0:;
+#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT(n) \
+  coro_susp_point = n;                            \
+  case n:;
+
+#define WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(n) \
+  if (!status.repr) {                                           \
+    goto ok;                                                    \
+  } else if (*status.repr != '$') {                             \
+    goto exit;                                                  \
+  }                                                             \
+  coro_susp_point = n;                                          \
+  goto suspend;                                                 \
+  case n:;
+
+// The "defined(__clang__)" isn't redundant. While vanilla clang defines
+// __GNUC__, clang-cl (which mimics MSVC's cl.exe) does not.
+#if defined(__GNUC__) || defined(__clang__)
+#define WUFFS_BASE__LIKELY(expr) (__builtin_expect(!!(expr), 1))
+#define WUFFS_BASE__UNLIKELY(expr) (__builtin_expect(!!(expr), 0))
+#else
+#define WUFFS_BASE__LIKELY(expr) (expr)
+#define WUFFS_BASE__UNLIKELY(expr) (expr)
+#endif
+
+// --------
+
+static inline wuffs_base__empty_struct  //
+wuffs_base__ignore_status(wuffs_base__status z) {
+  return wuffs_base__make_empty_struct();
+}
+
+static inline wuffs_base__status  //
+wuffs_base__status__ensure_not_a_suspension(wuffs_base__status z) {
+  if (z.repr && (*z.repr == '$')) {
+    z.repr = wuffs_base__error__cannot_return_a_suspension;
+  }
+  return z;
+}
+
+// --------
+
+// wuffs_base__iterate_total_advance returns the exclusive pointer-offset at
+// which iteration should stop. The overall slice has length total_len, each
+// iteration's sub-slice has length iter_len and are placed iter_advance apart.
+//
+// The iter_advance may not be larger than iter_len. The iter_advance may be
+// smaller than iter_len, in which case the sub-slices will overlap.
+//
+// The return value r satisfies ((0 <= r) && (r <= total_len)).
+//
+// For example, if total_len = 15, iter_len = 5 and iter_advance = 3, there are
+// four iterations at offsets 0, 3, 6 and 9. This function returns 12.
+//
+// 0123456789012345
+// [....]
+//    [....]
+//       [....]
+//          [....]
+//             $
+// 0123456789012345
+//
+// For example, if total_len = 15, iter_len = 5 and iter_advance = 5, there are
+// three iterations at offsets 0, 5 and 10. This function returns 15.
+//
+// 0123456789012345
+// [....]
+//      [....]
+//           [....]
+//                $
+// 0123456789012345
+static inline size_t  //
+wuffs_base__iterate_total_advance(size_t total_len,
+                                  size_t iter_len,
+                                  size_t iter_advance) {
+  if (total_len >= iter_len) {
+    size_t n = total_len - iter_len;
+    return ((n / iter_advance) * iter_advance) + iter_advance;
+  }
+  return 0;
+}
+
+// ---------------- Numeric Types
+
+extern const uint8_t wuffs_base__low_bits_mask__u8[8];
+extern const uint16_t wuffs_base__low_bits_mask__u16[16];
+extern const uint32_t wuffs_base__low_bits_mask__u32[32];
+extern const uint64_t wuffs_base__low_bits_mask__u64[64];
+
+#define WUFFS_BASE__LOW_BITS_MASK__U8(n) (wuffs_base__low_bits_mask__u8[n])
+#define WUFFS_BASE__LOW_BITS_MASK__U16(n) (wuffs_base__low_bits_mask__u16[n])
+#define WUFFS_BASE__LOW_BITS_MASK__U32(n) (wuffs_base__low_bits_mask__u32[n])
+#define WUFFS_BASE__LOW_BITS_MASK__U64(n) (wuffs_base__low_bits_mask__u64[n])
+
+// --------
+
+static inline void  //
+wuffs_base__u8__sat_add_indirect(uint8_t* x, uint8_t y) {
+  *x = wuffs_base__u8__sat_add(*x, y);
+}
+
+static inline void  //
+wuffs_base__u8__sat_sub_indirect(uint8_t* x, uint8_t y) {
+  *x = wuffs_base__u8__sat_sub(*x, y);
+}
+
+static inline void  //
+wuffs_base__u16__sat_add_indirect(uint16_t* x, uint16_t y) {
+  *x = wuffs_base__u16__sat_add(*x, y);
+}
+
+static inline void  //
+wuffs_base__u16__sat_sub_indirect(uint16_t* x, uint16_t y) {
+  *x = wuffs_base__u16__sat_sub(*x, y);
+}
+
+static inline void  //
+wuffs_base__u32__sat_add_indirect(uint32_t* x, uint32_t y) {
+  *x = wuffs_base__u32__sat_add(*x, y);
+}
+
+static inline void  //
+wuffs_base__u32__sat_sub_indirect(uint32_t* x, uint32_t y) {
+  *x = wuffs_base__u32__sat_sub(*x, y);
+}
+
+static inline void  //
+wuffs_base__u64__sat_add_indirect(uint64_t* x, uint64_t y) {
+  *x = wuffs_base__u64__sat_add(*x, y);
+}
+
+static inline void  //
+wuffs_base__u64__sat_sub_indirect(uint64_t* x, uint64_t y) {
+  *x = wuffs_base__u64__sat_sub(*x, y);
+}
+
+// ---------------- Slices and Tables
+
+// wuffs_base__slice_u8__prefix returns up to the first up_to bytes of s.
+static inline wuffs_base__slice_u8  //
+wuffs_base__slice_u8__prefix(wuffs_base__slice_u8 s, uint64_t up_to) {
+  if (((uint64_t)(s.len)) > up_to) {
+    s.len = ((size_t)up_to);
+  }
+  return s;
+}
+
+// wuffs_base__slice_u8__suffix returns up to the last up_to bytes of s.
+static inline wuffs_base__slice_u8  //
+wuffs_base__slice_u8__suffix(wuffs_base__slice_u8 s, uint64_t up_to) {
+  if (((uint64_t)(s.len)) > up_to) {
+    s.ptr += ((uint64_t)(s.len)) - up_to;
+    s.len = ((size_t)up_to);
+  }
+  return s;
+}
+
+// wuffs_base__slice_u8__copy_from_slice calls memmove(dst.ptr, src.ptr, len)
+// where len is the minimum of dst.len and src.len.
+//
+// Passing a wuffs_base__slice_u8 with all fields NULL or zero (a valid, empty
+// slice) is valid and results in a no-op.
+static inline uint64_t  //
+wuffs_base__slice_u8__copy_from_slice(wuffs_base__slice_u8 dst,
+                                      wuffs_base__slice_u8 src) {
+  size_t len = dst.len < src.len ? dst.len : src.len;
+  if (len > 0) {
+    memmove(dst.ptr, src.ptr, len);
+  }
+  return len;
+}
+
+// --------
+
+static inline wuffs_base__slice_u8  //
+wuffs_base__table_u8__row_u32(wuffs_base__table_u8 t, uint32_t y) {
+  if (y < t.height) {
+    return wuffs_base__make_slice_u8(t.ptr + (t.stride * y), t.width);
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+
+// ---------------- Slices and Tables (Utility)
+
+#define wuffs_base__utility__empty_slice_u8 wuffs_base__empty_slice_u8
+
+// ---------------- Ranges and Rects
+
+static inline uint32_t  //
+wuffs_base__range_ii_u32__get_min_incl(const wuffs_base__range_ii_u32* r) {
+  return r->min_incl;
+}
+
+static inline uint32_t  //
+wuffs_base__range_ii_u32__get_max_incl(const wuffs_base__range_ii_u32* r) {
+  return r->max_incl;
+}
+
+static inline uint32_t  //
+wuffs_base__range_ie_u32__get_min_incl(const wuffs_base__range_ie_u32* r) {
+  return r->min_incl;
+}
+
+static inline uint32_t  //
+wuffs_base__range_ie_u32__get_max_excl(const wuffs_base__range_ie_u32* r) {
+  return r->max_excl;
+}
+
+static inline uint64_t  //
+wuffs_base__range_ii_u64__get_min_incl(const wuffs_base__range_ii_u64* r) {
+  return r->min_incl;
+}
+
+static inline uint64_t  //
+wuffs_base__range_ii_u64__get_max_incl(const wuffs_base__range_ii_u64* r) {
+  return r->max_incl;
+}
+
+static inline uint64_t  //
+wuffs_base__range_ie_u64__get_min_incl(const wuffs_base__range_ie_u64* r) {
+  return r->min_incl;
+}
+
+static inline uint64_t  //
+wuffs_base__range_ie_u64__get_max_excl(const wuffs_base__range_ie_u64* r) {
+  return r->max_excl;
+}
+
+// ---------------- Ranges and Rects (Utility)
+
+#define wuffs_base__utility__empty_range_ii_u32 wuffs_base__empty_range_ii_u32
+#define wuffs_base__utility__empty_range_ie_u32 wuffs_base__empty_range_ie_u32
+#define wuffs_base__utility__empty_range_ii_u64 wuffs_base__empty_range_ii_u64
+#define wuffs_base__utility__empty_range_ie_u64 wuffs_base__empty_range_ie_u64
+#define wuffs_base__utility__empty_rect_ii_u32 wuffs_base__empty_rect_ii_u32
+#define wuffs_base__utility__empty_rect_ie_u32 wuffs_base__empty_rect_ie_u32
+#define wuffs_base__utility__make_range_ii_u32 wuffs_base__make_range_ii_u32
+#define wuffs_base__utility__make_range_ie_u32 wuffs_base__make_range_ie_u32
+#define wuffs_base__utility__make_range_ii_u64 wuffs_base__make_range_ii_u64
+#define wuffs_base__utility__make_range_ie_u64 wuffs_base__make_range_ie_u64
+#define wuffs_base__utility__make_rect_ii_u32 wuffs_base__make_rect_ii_u32
+#define wuffs_base__utility__make_rect_ie_u32 wuffs_base__make_rect_ie_u32
+
+// ---------------- I/O
+
+static inline uint64_t  //
+wuffs_base__io__count_since(uint64_t mark, uint64_t index) {
+  if (index >= mark) {
+    return index - mark;
+  }
+  return 0;
+}
+
+// TODO: drop the "const" in "const uint8_t* ptr". Some though required about
+// the base.io_reader.since method returning a mutable "slice base.u8".
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
+static inline wuffs_base__slice_u8  //
+wuffs_base__io__since(uint64_t mark, uint64_t index, const uint8_t* ptr) {
+  if (index >= mark) {
+    return wuffs_base__make_slice_u8(((uint8_t*)ptr) + mark,
+                                     ((size_t)(index - mark)));
+  }
+  return wuffs_base__make_slice_u8(NULL, 0);
+}
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+
+// --------
+
+static inline void  //
+wuffs_base__io_reader__limit(const uint8_t** ptr_io2_r,
+                             const uint8_t* iop_r,
+                             uint64_t limit) {
+  if (((uint64_t)(*ptr_io2_r - iop_r)) > limit) {
+    *ptr_io2_r = iop_r + limit;
+  }
+}
+
+static inline uint32_t  //
+wuffs_base__io_reader__limited_copy_u32_to_slice(const uint8_t** ptr_iop_r,
+                                                 const uint8_t* io2_r,
+                                                 uint32_t length,
+                                                 wuffs_base__slice_u8 dst) {
+  const uint8_t* iop_r = *ptr_iop_r;
+  size_t n = dst.len;
+  if (n > length) {
+    n = length;
+  }
+  if (n > ((size_t)(io2_r - iop_r))) {
+    n = (size_t)(io2_r - iop_r);
+  }
+  if (n > 0) {
+    memmove(dst.ptr, iop_r, n);
+    *ptr_iop_r += n;
+  }
+  return (uint32_t)(n);
+}
+
+// wuffs_base__io_reader__match7 returns whether the io_reader's upcoming bytes
+// start with the given prefix (up to 7 bytes long). It is peek-like, not
+// read-like, in that there are no side-effects.
+//
+// The low 3 bits of a hold the prefix length, n.
+//
+// The high 56 bits of a hold the prefix itself, in little-endian order. The
+// first prefix byte is in bits 8..=15, the second prefix byte is in bits
+// 16..=23, etc. The high (8 * (7 - n)) bits are ignored.
+//
+// There are three possible return values:
+//  - 0 means success.
+//  - 1 means inconclusive, equivalent to "$short read".
+//  - 2 means failure.
+static inline uint32_t  //
+wuffs_base__io_reader__match7(const uint8_t* iop_r,
+                              const uint8_t* io2_r,
+                              wuffs_base__io_buffer* r,
+                              uint64_t a) {
+  uint32_t n = a & 7;
+  a >>= 8;
+  if ((io2_r - iop_r) >= 8) {
+    uint64_t x = wuffs_base__peek_u64le__no_bounds_check(iop_r);
+    uint32_t shift = 8 * (8 - n);
+    return ((a << shift) == (x << shift)) ? 0 : 2;
+  }
+  for (; n > 0; n--) {
+    if (iop_r >= io2_r) {
+      return (r && r->meta.closed) ? 2 : 1;
+    } else if (*iop_r != ((uint8_t)(a))) {
+      return 2;
+    }
+    iop_r++;
+    a >>= 8;
+  }
+  return 0;
+}
+
+static inline wuffs_base__io_buffer*  //
+wuffs_base__io_reader__set(wuffs_base__io_buffer* b,
+                           const uint8_t** ptr_iop_r,
+                           const uint8_t** ptr_io0_r,
+                           const uint8_t** ptr_io1_r,
+                           const uint8_t** ptr_io2_r,
+                           wuffs_base__slice_u8 data,
+                           uint64_t history_position) {
+  b->data = data;
+  b->meta.wi = data.len;
+  b->meta.ri = 0;
+  b->meta.pos = history_position;
+  b->meta.closed = false;
+
+  *ptr_iop_r = data.ptr;
+  *ptr_io0_r = data.ptr;
+  *ptr_io1_r = data.ptr;
+  *ptr_io2_r = data.ptr + data.len;
+
+  return b;
+}
+
+// --------
+
+static inline uint64_t  //
+wuffs_base__io_writer__copy_from_slice(uint8_t** ptr_iop_w,
+                                       uint8_t* io2_w,
+                                       wuffs_base__slice_u8 src) {
+  uint8_t* iop_w = *ptr_iop_w;
+  size_t n = src.len;
+  if (n > ((size_t)(io2_w - iop_w))) {
+    n = (size_t)(io2_w - iop_w);
+  }
+  if (n > 0) {
+    memmove(iop_w, src.ptr, n);
+    *ptr_iop_w += n;
+  }
+  return (uint64_t)(n);
+}
+
+static inline void  //
+wuffs_base__io_writer__limit(uint8_t** ptr_io2_w,
+                             uint8_t* iop_w,
+                             uint64_t limit) {
+  if (((uint64_t)(*ptr_io2_w - iop_w)) > limit) {
+    *ptr_io2_w = iop_w + limit;
+  }
+}
+
+static inline uint32_t  //
+wuffs_base__io_writer__limited_copy_u32_from_history(uint8_t** ptr_iop_w,
+                                                     uint8_t* io1_w,
+                                                     uint8_t* io2_w,
+                                                     uint32_t length,
+                                                     uint32_t distance) {
+  if (!distance) {
+    return 0;
+  }
+  uint8_t* p = *ptr_iop_w;
+  if ((size_t)(p - io1_w) < (size_t)(distance)) {
+    return 0;
+  }
+  uint8_t* q = p - distance;
+  size_t n = (size_t)(io2_w - p);
+  if ((size_t)(length) > n) {
+    length = (uint32_t)(n);
+  } else {
+    n = (size_t)(length);
+  }
+  // TODO: unrolling by 3 seems best for the std/deflate benchmarks, but that
+  // is mostly because 3 is the minimum length for the deflate format. This
+  // function implementation shouldn't overfit to that one format. Perhaps the
+  // limited_copy_u32_from_history Wuffs method should also take an unroll hint
+  // argument, and the cgen can look if that argument is the constant
+  // expression '3'.
+  //
+  // See also wuffs_base__io_writer__limited_copy_u32_from_history_fast below.
+  for (; n >= 3; n -= 3) {
+    *p++ = *q++;
+    *p++ = *q++;
+    *p++ = *q++;
+  }
+  for (; n; n--) {
+    *p++ = *q++;
+  }
+  *ptr_iop_w = p;
+  return length;
+}
+
+// wuffs_base__io_writer__limited_copy_u32_from_history_fast is like the
+// wuffs_base__io_writer__limited_copy_u32_from_history function above, but has
+// stronger pre-conditions.
+//
+// The caller needs to prove that:
+//  - length   <= (io2_w      - *ptr_iop_w)
+//  - distance >= 1
+//  - distance <= (*ptr_iop_w - io1_w)
+static inline uint32_t  //
+wuffs_base__io_writer__limited_copy_u32_from_history_fast(uint8_t** ptr_iop_w,
+                                                          uint8_t* io1_w,
+                                                          uint8_t* io2_w,
+                                                          uint32_t length,
+                                                          uint32_t distance) {
+  uint8_t* p = *ptr_iop_w;
+  uint8_t* q = p - distance;
+  uint32_t n = length;
+  for (; n >= 3; n -= 3) {
+    *p++ = *q++;
+    *p++ = *q++;
+    *p++ = *q++;
+  }
+  for (; n; n--) {
+    *p++ = *q++;
+  }
+  *ptr_iop_w = p;
+  return length;
+}
+
+// wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_distance_1_fast
+// copies the previous byte (the one immediately before *ptr_iop_w), copying 8
+// byte chunks at a time. Each chunk contains 8 repetitions of the same byte.
+//
+// In terms of number of bytes copied, length is rounded up to a multiple of 8.
+// As a special case, a zero length rounds up to 8 (even though 0 is already a
+// multiple of 8), since there is always at least one 8 byte chunk copied.
+//
+// In terms of advancing *ptr_iop_w, length is not rounded up.
+//
+// The caller needs to prove that:
+//  - (length + 8) <= (io2_w      - *ptr_iop_w)
+//  - distance     == 1
+//  - distance     <= (*ptr_iop_w - io1_w)
+static inline uint32_t  //
+wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_distance_1_fast(
+    uint8_t** ptr_iop_w,
+    uint8_t* io1_w,
+    uint8_t* io2_w,
+    uint32_t length,
+    uint32_t distance) {
+  uint8_t* p = *ptr_iop_w;
+  uint64_t x = p[-1];
+  x |= x << 8;
+  x |= x << 16;
+  x |= x << 32;
+  uint32_t n = length;
+  while (1) {
+    wuffs_base__poke_u64le__no_bounds_check(p, x);
+    if (n <= 8) {
+      p += n;
+      break;
+    }
+    p += 8;
+    n -= 8;
+  }
+  *ptr_iop_w = p;
+  return length;
+}
+
+// wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_fast is
+// like the wuffs_base__io_writer__limited_copy_u32_from_history_fast function
+// above, but copies 8 byte chunks at a time.
+//
+// In terms of number of bytes copied, length is rounded up to a multiple of 8.
+// As a special case, a zero length rounds up to 8 (even though 0 is already a
+// multiple of 8), since there is always at least one 8 byte chunk copied.
+//
+// In terms of advancing *ptr_iop_w, length is not rounded up.
+//
+// The caller needs to prove that:
+//  - (length + 8) <= (io2_w      - *ptr_iop_w)
+//  - distance     >= 8
+//  - distance     <= (*ptr_iop_w - io1_w)
+static inline uint32_t  //
+wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_fast(
+    uint8_t** ptr_iop_w,
+    uint8_t* io1_w,
+    uint8_t* io2_w,
+    uint32_t length,
+    uint32_t distance) {
+  uint8_t* p = *ptr_iop_w;
+  uint8_t* q = p - distance;
+  uint32_t n = length;
+  while (1) {
+    memcpy(p, q, 8);
+    if (n <= 8) {
+      p += n;
+      break;
+    }
+    p += 8;
+    q += 8;
+    n -= 8;
+  }
+  *ptr_iop_w = p;
+  return length;
+}
+
+static inline uint32_t  //
+wuffs_base__io_writer__limited_copy_u32_from_reader(uint8_t** ptr_iop_w,
+                                                    uint8_t* io2_w,
+                                                    uint32_t length,
+                                                    const uint8_t** ptr_iop_r,
+                                                    const uint8_t* io2_r) {
+  uint8_t* iop_w = *ptr_iop_w;
+  size_t n = length;
+  if (n > ((size_t)(io2_w - iop_w))) {
+    n = (size_t)(io2_w - iop_w);
+  }
+  const uint8_t* iop_r = *ptr_iop_r;
+  if (n > ((size_t)(io2_r - iop_r))) {
+    n = (size_t)(io2_r - iop_r);
+  }
+  if (n > 0) {
+    memmove(iop_w, iop_r, n);
+    *ptr_iop_w += n;
+    *ptr_iop_r += n;
+  }
+  return (uint32_t)(n);
+}
+
+static inline uint32_t  //
+wuffs_base__io_writer__limited_copy_u32_from_slice(uint8_t** ptr_iop_w,
+                                                   uint8_t* io2_w,
+                                                   uint32_t length,
+                                                   wuffs_base__slice_u8 src) {
+  uint8_t* iop_w = *ptr_iop_w;
+  size_t n = src.len;
+  if (n > length) {
+    n = length;
+  }
+  if (n > ((size_t)(io2_w - iop_w))) {
+    n = (size_t)(io2_w - iop_w);
+  }
+  if (n > 0) {
+    memmove(iop_w, src.ptr, n);
+    *ptr_iop_w += n;
+  }
+  return (uint32_t)(n);
+}
+
+static inline wuffs_base__io_buffer*  //
+wuffs_base__io_writer__set(wuffs_base__io_buffer* b,
+                           uint8_t** ptr_iop_w,
+                           uint8_t** ptr_io0_w,
+                           uint8_t** ptr_io1_w,
+                           uint8_t** ptr_io2_w,
+                           wuffs_base__slice_u8 data,
+                           uint64_t history_position) {
+  b->data = data;
+  b->meta.wi = 0;
+  b->meta.ri = 0;
+  b->meta.pos = history_position;
+  b->meta.closed = false;
+
+  *ptr_iop_w = data.ptr;
+  *ptr_io0_w = data.ptr;
+  *ptr_io1_w = data.ptr;
+  *ptr_io2_w = data.ptr + data.len;
+
+  return b;
+}
+
+// ---------------- I/O (Utility)
+
+#define wuffs_base__utility__empty_io_reader wuffs_base__empty_io_reader
+#define wuffs_base__utility__empty_io_writer wuffs_base__empty_io_writer
+
+// ---------------- Tokens
+
+// ---------------- Tokens (Utility)
+
+// ---------------- Memory Allocation
+
+// ---------------- Images
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_base__pixel_swizzler__limited_swizzle_u32_interleaved_from_reader(
+    const wuffs_base__pixel_swizzler* p,
+    uint32_t up_to_num_pixels,
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    const uint8_t** ptr_iop_r,
+    const uint8_t* io2_r);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_base__pixel_swizzler__swizzle_interleaved_from_reader(
+    const wuffs_base__pixel_swizzler* p,
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    const uint8_t** ptr_iop_r,
+    const uint8_t* io2_r);
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(
+    const wuffs_base__pixel_swizzler* p,
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    uint64_t num_pixels);
+
+// ---------------- Images (Utility)
+
+#define wuffs_base__utility__make_pixel_format wuffs_base__make_pixel_format
+
+// ---------------- String Conversions
+
+// ---------------- Unicode and UTF-8
+
+// ----------------
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
+    defined(WUFFS_CONFIG__MODULE__BASE__CORE)
+
+const uint8_t wuffs_base__low_bits_mask__u8[8] = {
+    0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F,
+};
+
+const uint16_t wuffs_base__low_bits_mask__u16[16] = {
+    0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F,
+    0x00FF, 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF,
+};
+
+const uint32_t wuffs_base__low_bits_mask__u32[32] = {
+    0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000F, 0x0000001F,
+    0x0000003F, 0x0000007F, 0x000000FF, 0x000001FF, 0x000003FF, 0x000007FF,
+    0x00000FFF, 0x00001FFF, 0x00003FFF, 0x00007FFF, 0x0000FFFF, 0x0001FFFF,
+    0x0003FFFF, 0x0007FFFF, 0x000FFFFF, 0x001FFFFF, 0x003FFFFF, 0x007FFFFF,
+    0x00FFFFFF, 0x01FFFFFF, 0x03FFFFFF, 0x07FFFFFF, 0x0FFFFFFF, 0x1FFFFFFF,
+    0x3FFFFFFF, 0x7FFFFFFF,
+};
+
+const uint64_t wuffs_base__low_bits_mask__u64[64] = {
+    0x0000000000000000, 0x0000000000000001, 0x0000000000000003,
+    0x0000000000000007, 0x000000000000000F, 0x000000000000001F,
+    0x000000000000003F, 0x000000000000007F, 0x00000000000000FF,
+    0x00000000000001FF, 0x00000000000003FF, 0x00000000000007FF,
+    0x0000000000000FFF, 0x0000000000001FFF, 0x0000000000003FFF,
+    0x0000000000007FFF, 0x000000000000FFFF, 0x000000000001FFFF,
+    0x000000000003FFFF, 0x000000000007FFFF, 0x00000000000FFFFF,
+    0x00000000001FFFFF, 0x00000000003FFFFF, 0x00000000007FFFFF,
+    0x0000000000FFFFFF, 0x0000000001FFFFFF, 0x0000000003FFFFFF,
+    0x0000000007FFFFFF, 0x000000000FFFFFFF, 0x000000001FFFFFFF,
+    0x000000003FFFFFFF, 0x000000007FFFFFFF, 0x00000000FFFFFFFF,
+    0x00000001FFFFFFFF, 0x00000003FFFFFFFF, 0x00000007FFFFFFFF,
+    0x0000000FFFFFFFFF, 0x0000001FFFFFFFFF, 0x0000003FFFFFFFFF,
+    0x0000007FFFFFFFFF, 0x000000FFFFFFFFFF, 0x000001FFFFFFFFFF,
+    0x000003FFFFFFFFFF, 0x000007FFFFFFFFFF, 0x00000FFFFFFFFFFF,
+    0x00001FFFFFFFFFFF, 0x00003FFFFFFFFFFF, 0x00007FFFFFFFFFFF,
+    0x0000FFFFFFFFFFFF, 0x0001FFFFFFFFFFFF, 0x0003FFFFFFFFFFFF,
+    0x0007FFFFFFFFFFFF, 0x000FFFFFFFFFFFFF, 0x001FFFFFFFFFFFFF,
+    0x003FFFFFFFFFFFFF, 0x007FFFFFFFFFFFFF, 0x00FFFFFFFFFFFFFF,
+    0x01FFFFFFFFFFFFFF, 0x03FFFFFFFFFFFFFF, 0x07FFFFFFFFFFFFFF,
+    0x0FFFFFFFFFFFFFFF, 0x1FFFFFFFFFFFFFFF, 0x3FFFFFFFFFFFFFFF,
+    0x7FFFFFFFFFFFFFFF,
+};
+
+const uint32_t wuffs_base__pixel_format__bits_per_channel[16] = {
+    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+    0x08, 0x0A, 0x0C, 0x10, 0x18, 0x20, 0x30, 0x40,
+};
+
+const char wuffs_base__note__i_o_redirect[] = "@base: I/O redirect";
+const char wuffs_base__note__end_of_data[] = "@base: end of data";
+const char wuffs_base__note__metadata_reported[] = "@base: metadata reported";
+const char wuffs_base__suspension__even_more_information[] = "$base: even more information";
+const char wuffs_base__suspension__mispositioned_read[] = "$base: mispositioned read";
+const char wuffs_base__suspension__mispositioned_write[] = "$base: mispositioned write";
+const char wuffs_base__suspension__short_read[] = "$base: short read";
+const char wuffs_base__suspension__short_write[] = "$base: short write";
+const char wuffs_base__error__bad_i_o_position[] = "#base: bad I/O position";
+const char wuffs_base__error__bad_argument_length_too_short[] = "#base: bad argument (length too short)";
+const char wuffs_base__error__bad_argument[] = "#base: bad argument";
+const char wuffs_base__error__bad_call_sequence[] = "#base: bad call sequence";
+const char wuffs_base__error__bad_data[] = "#base: bad data";
+const char wuffs_base__error__bad_receiver[] = "#base: bad receiver";
+const char wuffs_base__error__bad_restart[] = "#base: bad restart";
+const char wuffs_base__error__bad_sizeof_receiver[] = "#base: bad sizeof receiver";
+const char wuffs_base__error__bad_vtable[] = "#base: bad vtable";
+const char wuffs_base__error__bad_workbuf_length[] = "#base: bad workbuf length";
+const char wuffs_base__error__bad_wuffs_version[] = "#base: bad wuffs version";
+const char wuffs_base__error__cannot_return_a_suspension[] = "#base: cannot return a suspension";
+const char wuffs_base__error__disabled_by_previous_error[] = "#base: disabled by previous error";
+const char wuffs_base__error__initialize_falsely_claimed_already_zeroed[] = "#base: initialize falsely claimed already zeroed";
+const char wuffs_base__error__initialize_not_called[] = "#base: initialize not called";
+const char wuffs_base__error__interleaved_coroutine_calls[] = "#base: interleaved coroutine calls";
+const char wuffs_base__error__no_more_information[] = "#base: no more information";
+const char wuffs_base__error__not_enough_data[] = "#base: not enough data";
+const char wuffs_base__error__out_of_bounds[] = "#base: out of bounds";
+const char wuffs_base__error__unsupported_method[] = "#base: unsupported method";
+const char wuffs_base__error__unsupported_option[] = "#base: unsupported option";
+const char wuffs_base__error__unsupported_pixel_swizzler_option[] = "#base: unsupported pixel swizzler option";
+const char wuffs_base__error__too_much_data[] = "#base: too much data";
+
+const char wuffs_base__hasher_u32__vtable_name[] = "{vtable}wuffs_base__hasher_u32";
+const char wuffs_base__image_decoder__vtable_name[] = "{vtable}wuffs_base__image_decoder";
+const char wuffs_base__io_transformer__vtable_name[] = "{vtable}wuffs_base__io_transformer";
+const char wuffs_base__token_decoder__vtable_name[] = "{vtable}wuffs_base__token_decoder";
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE)  ||
+        // defined(WUFFS_CONFIG__MODULE__BASE__CORE)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
+    defined(WUFFS_CONFIG__MODULE__BASE__INTERFACES)
+
+// ---------------- Interface Definitions.
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_base__hasher_u32__set_quirk_enabled(
+    wuffs_base__hasher_u32* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__hasher_u32__vtable_name) {
+      const wuffs_base__hasher_u32__func_ptrs* func_ptrs =
+          (const wuffs_base__hasher_u32__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->set_quirk_enabled)(self, a_quirk, a_enabled);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_empty_struct();
+}
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_base__hasher_u32__update_u32(
+    wuffs_base__hasher_u32* self,
+    wuffs_base__slice_u8 a_x) {
+  if (!self) {
+    return 0;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return 0;
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__hasher_u32__vtable_name) {
+      const wuffs_base__hasher_u32__func_ptrs* func_ptrs =
+          (const wuffs_base__hasher_u32__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->update_u32)(self, a_x);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return 0;
+}
+
+// --------
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__image_decoder__decode_frame(
+    wuffs_base__image_decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+            ? wuffs_base__error__disabled_by_previous_error
+            : wuffs_base__error__initialize_not_called);
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->decode_frame)(self, a_dst, a_src, a_blend, a_workbuf, a_opts);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__image_decoder__decode_frame_config(
+    wuffs_base__image_decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+            ? wuffs_base__error__disabled_by_previous_error
+            : wuffs_base__error__initialize_not_called);
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->decode_frame_config)(self, a_dst, a_src);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__image_decoder__decode_image_config(
+    wuffs_base__image_decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+            ? wuffs_base__error__disabled_by_previous_error
+            : wuffs_base__error__initialize_not_called);
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->decode_image_config)(self, a_dst, a_src);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_base__image_decoder__frame_dirty_rect(
+    const wuffs_base__image_decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->frame_dirty_rect)(self);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__utility__empty_rect_ie_u32();
+}
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_base__image_decoder__num_animation_loops(
+    const wuffs_base__image_decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->num_animation_loops)(self);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return 0;
+}
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_base__image_decoder__num_decoded_frame_configs(
+    const wuffs_base__image_decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->num_decoded_frame_configs)(self);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return 0;
+}
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_base__image_decoder__num_decoded_frames(
+    const wuffs_base__image_decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->num_decoded_frames)(self);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return 0;
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__image_decoder__restart_frame(
+    wuffs_base__image_decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+            ? wuffs_base__error__disabled_by_previous_error
+            : wuffs_base__error__initialize_not_called);
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->restart_frame)(self, a_index, a_io_position);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_base__image_decoder__set_quirk_enabled(
+    wuffs_base__image_decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->set_quirk_enabled)(self, a_quirk, a_enabled);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_empty_struct();
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_base__image_decoder__set_report_metadata(
+    wuffs_base__image_decoder* self,
+    uint32_t a_fourcc,
+    bool a_report) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->set_report_metadata)(self, a_fourcc, a_report);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_empty_struct();
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__image_decoder__tell_me_more(
+    wuffs_base__image_decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+            ? wuffs_base__error__disabled_by_previous_error
+            : wuffs_base__error__initialize_not_called);
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->tell_me_more)(self, a_dst, a_minfo, a_src);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_base__image_decoder__workbuf_len(
+    const wuffs_base__image_decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__image_decoder__vtable_name) {
+      const wuffs_base__image_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__image_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->workbuf_len)(self);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__utility__empty_range_ii_u64();
+}
+
+// --------
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_base__io_transformer__set_quirk_enabled(
+    wuffs_base__io_transformer* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__io_transformer__vtable_name) {
+      const wuffs_base__io_transformer__func_ptrs* func_ptrs =
+          (const wuffs_base__io_transformer__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->set_quirk_enabled)(self, a_quirk, a_enabled);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_empty_struct();
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__io_transformer__transform_io(
+    wuffs_base__io_transformer* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+            ? wuffs_base__error__disabled_by_previous_error
+            : wuffs_base__error__initialize_not_called);
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__io_transformer__vtable_name) {
+      const wuffs_base__io_transformer__func_ptrs* func_ptrs =
+          (const wuffs_base__io_transformer__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->transform_io)(self, a_dst, a_src, a_workbuf);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_base__io_transformer__workbuf_len(
+    const wuffs_base__io_transformer* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__io_transformer__vtable_name) {
+      const wuffs_base__io_transformer__func_ptrs* func_ptrs =
+          (const wuffs_base__io_transformer__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->workbuf_len)(self);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__utility__empty_range_ii_u64();
+}
+
+// --------
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_base__token_decoder__decode_tokens(
+    wuffs_base__token_decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+            ? wuffs_base__error__disabled_by_previous_error
+            : wuffs_base__error__initialize_not_called);
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__token_decoder__vtable_name) {
+      const wuffs_base__token_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__token_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->decode_tokens)(self, a_dst, a_src, a_workbuf);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_status(wuffs_base__error__bad_vtable);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_base__token_decoder__set_quirk_enabled(
+    wuffs_base__token_decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__token_decoder__vtable_name) {
+      const wuffs_base__token_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__token_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->set_quirk_enabled)(self, a_quirk, a_enabled);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__make_empty_struct();
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_base__token_decoder__workbuf_len(
+    const wuffs_base__token_decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  const wuffs_base__vtable* v = &self->private_impl.first_vtable;
+  int i;
+  for (i = 0; i < 63; i++) {
+    if (v->vtable_name == wuffs_base__token_decoder__vtable_name) {
+      const wuffs_base__token_decoder__func_ptrs* func_ptrs =
+          (const wuffs_base__token_decoder__func_ptrs*)(v->function_pointers);
+      return (*func_ptrs->workbuf_len)(self);
+    } else if (v->vtable_name == NULL) {
+      break;
+    }
+    v++;
+  }
+
+  return wuffs_base__utility__empty_range_ii_u64();
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE__INTERFACES)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
+    defined(WUFFS_CONFIG__MODULE__BASE__FLOATCONV)
+
+// ---------------- IEEE 754 Floating Point
+
+// The etc__hpd_left_shift and etc__powers_of_5 tables were printed by
+// script/print-hpd-left-shift.go. That script has an optional -comments flag,
+// whose output is not copied here, which prints further detail.
+//
+// These tables are used in
+// wuffs_base__private_implementation__high_prec_dec__lshift_num_new_digits.
+
+// wuffs_base__private_implementation__hpd_left_shift[i] encodes the number of
+// new digits created after multiplying a positive integer by (1 << i): the
+// additional length in the decimal representation. For example, shifting "234"
+// by 3 (equivalent to multiplying by 8) will produce "1872". Going from a
+// 3-length string to a 4-length string means that 1 new digit was added (and
+// existing digits may have changed).
+//
+// Shifting by i can add either N or N-1 new digits, depending on whether the
+// original positive integer compares >= or < to the i'th power of 5 (as 10
+// equals 2 * 5). Comparison is lexicographic, not numerical.
+//
+// For example, shifting by 4 (i.e. multiplying by 16) can add 1 or 2 new
+// digits, depending on a lexicographic comparison to (5 ** 4), i.e. "625":
+//  - ("1"      << 4) is "16",       which adds 1 new digit.
+//  - ("5678"   << 4) is "90848",    which adds 1 new digit.
+//  - ("624"    << 4) is "9984",     which adds 1 new digit.
+//  - ("62498"  << 4) is "999968",   which adds 1 new digit.
+//  - ("625"    << 4) is "10000",    which adds 2 new digits.
+//  - ("625001" << 4) is "10000016", which adds 2 new digits.
+//  - ("7008"   << 4) is "112128",   which adds 2 new digits.
+//  - ("99"     << 4) is "1584",     which adds 2 new digits.
+//
+// Thus, when i is 4, N is 2 and (5 ** i) is "625". This etc__hpd_left_shift
+// array encodes this as:
+//  - etc__hpd_left_shift[4] is 0x1006 = (2 << 11) | 0x0006.
+//  - etc__hpd_left_shift[5] is 0x1009 = (? << 11) | 0x0009.
+// where the ? isn't relevant for i == 4.
+//
+// The high 5 bits of etc__hpd_left_shift[i] is N, the higher of the two
+// possible number of new digits. The low 11 bits are an offset into the
+// etc__powers_of_5 array (of length 0x051C, so offsets fit in 11 bits). When i
+// is 4, its offset and the next one is 6 and 9, and etc__powers_of_5[6 .. 9]
+// is the string "\x06\x02\x05", so the relevant power of 5 is "625".
+//
+// Thanks to Ken Thompson for the original idea.
+static const uint16_t wuffs_base__private_implementation__hpd_left_shift[65] = {
+    0x0000, 0x0800, 0x0801, 0x0803, 0x1006, 0x1009, 0x100D, 0x1812, 0x1817,
+    0x181D, 0x2024, 0x202B, 0x2033, 0x203C, 0x2846, 0x2850, 0x285B, 0x3067,
+    0x3073, 0x3080, 0x388E, 0x389C, 0x38AB, 0x38BB, 0x40CC, 0x40DD, 0x40EF,
+    0x4902, 0x4915, 0x4929, 0x513E, 0x5153, 0x5169, 0x5180, 0x5998, 0x59B0,
+    0x59C9, 0x61E3, 0x61FD, 0x6218, 0x6A34, 0x6A50, 0x6A6D, 0x6A8B, 0x72AA,
+    0x72C9, 0x72E9, 0x7B0A, 0x7B2B, 0x7B4D, 0x8370, 0x8393, 0x83B7, 0x83DC,
+    0x8C02, 0x8C28, 0x8C4F, 0x9477, 0x949F, 0x94C8, 0x9CF2, 0x051C, 0x051C,
+    0x051C, 0x051C,
+};
+
+// wuffs_base__private_implementation__powers_of_5 contains the powers of 5,
+// concatenated together: "5", "25", "125", "625", "3125", etc.
+static const uint8_t wuffs_base__private_implementation__powers_of_5[0x051C] = {
+    5, 2, 5, 1, 2, 5, 6, 2, 5, 3, 1, 2, 5, 1, 5, 6, 2, 5, 7, 8, 1, 2, 5, 3, 9,
+    0, 6, 2, 5, 1, 9, 5, 3, 1, 2, 5, 9, 7, 6, 5, 6, 2, 5, 4, 8, 8, 2, 8, 1, 2,
+    5, 2, 4, 4, 1, 4, 0, 6, 2, 5, 1, 2, 2, 0, 7, 0, 3, 1, 2, 5, 6, 1, 0, 3, 5,
+    1, 5, 6, 2, 5, 3, 0, 5, 1, 7, 5, 7, 8, 1, 2, 5, 1, 5, 2, 5, 8, 7, 8, 9, 0,
+    6, 2, 5, 7, 6, 2, 9, 3, 9, 4, 5, 3, 1, 2, 5, 3, 8, 1, 4, 6, 9, 7, 2, 6, 5,
+    6, 2, 5, 1, 9, 0, 7, 3, 4, 8, 6, 3, 2, 8, 1, 2, 5, 9, 5, 3, 6, 7, 4, 3, 1,
+    6, 4, 0, 6, 2, 5, 4, 7, 6, 8, 3, 7, 1, 5, 8, 2, 0, 3, 1, 2, 5, 2, 3, 8, 4,
+    1, 8, 5, 7, 9, 1, 0, 1, 5, 6, 2, 5, 1, 1, 9, 2, 0, 9, 2, 8, 9, 5, 5, 0, 7,
+    8, 1, 2, 5, 5, 9, 6, 0, 4, 6, 4, 4, 7, 7, 5, 3, 9, 0, 6, 2, 5, 2, 9, 8, 0,
+    2, 3, 2, 2, 3, 8, 7, 6, 9, 5, 3, 1, 2, 5, 1, 4, 9, 0, 1, 1, 6, 1, 1, 9, 3,
+    8, 4, 7, 6, 5, 6, 2, 5, 7, 4, 5, 0, 5, 8, 0, 5, 9, 6, 9, 2, 3, 8, 2, 8, 1,
+    2, 5, 3, 7, 2, 5, 2, 9, 0, 2, 9, 8, 4, 6, 1, 9, 1, 4, 0, 6, 2, 5, 1, 8, 6,
+    2, 6, 4, 5, 1, 4, 9, 2, 3, 0, 9, 5, 7, 0, 3, 1, 2, 5, 9, 3, 1, 3, 2, 2, 5,
+    7, 4, 6, 1, 5, 4, 7, 8, 5, 1, 5, 6, 2, 5, 4, 6, 5, 6, 6, 1, 2, 8, 7, 3, 0,
+    7, 7, 3, 9, 2, 5, 7, 8, 1, 2, 5, 2, 3, 2, 8, 3, 0, 6, 4, 3, 6, 5, 3, 8, 6,
+    9, 6, 2, 8, 9, 0, 6, 2, 5, 1, 1, 6, 4, 1, 5, 3, 2, 1, 8, 2, 6, 9, 3, 4, 8,
+    1, 4, 4, 5, 3, 1, 2, 5, 5, 8, 2, 0, 7, 6, 6, 0, 9, 1, 3, 4, 6, 7, 4, 0, 7,
+    2, 2, 6, 5, 6, 2, 5, 2, 9, 1, 0, 3, 8, 3, 0, 4, 5, 6, 7, 3, 3, 7, 0, 3, 6,
+    1, 3, 2, 8, 1, 2, 5, 1, 4, 5, 5, 1, 9, 1, 5, 2, 2, 8, 3, 6, 6, 8, 5, 1, 8,
+    0, 6, 6, 4, 0, 6, 2, 5, 7, 2, 7, 5, 9, 5, 7, 6, 1, 4, 1, 8, 3, 4, 2, 5, 9,
+    0, 3, 3, 2, 0, 3, 1, 2, 5, 3, 6, 3, 7, 9, 7, 8, 8, 0, 7, 0, 9, 1, 7, 1, 2,
+    9, 5, 1, 6, 6, 0, 1, 5, 6, 2, 5, 1, 8, 1, 8, 9, 8, 9, 4, 0, 3, 5, 4, 5, 8,
+    5, 6, 4, 7, 5, 8, 3, 0, 0, 7, 8, 1, 2, 5, 9, 0, 9, 4, 9, 4, 7, 0, 1, 7, 7,
+    2, 9, 2, 8, 2, 3, 7, 9, 1, 5, 0, 3, 9, 0, 6, 2, 5, 4, 5, 4, 7, 4, 7, 3, 5,
+    0, 8, 8, 6, 4, 6, 4, 1, 1, 8, 9, 5, 7, 5, 1, 9, 5, 3, 1, 2, 5, 2, 2, 7, 3,
+    7, 3, 6, 7, 5, 4, 4, 3, 2, 3, 2, 0, 5, 9, 4, 7, 8, 7, 5, 9, 7, 6, 5, 6, 2,
+    5, 1, 1, 3, 6, 8, 6, 8, 3, 7, 7, 2, 1, 6, 1, 6, 0, 2, 9, 7, 3, 9, 3, 7, 9,
+    8, 8, 2, 8, 1, 2, 5, 5, 6, 8, 4, 3, 4, 1, 8, 8, 6, 0, 8, 0, 8, 0, 1, 4, 8,
+    6, 9, 6, 8, 9, 9, 4, 1, 4, 0, 6, 2, 5, 2, 8, 4, 2, 1, 7, 0, 9, 4, 3, 0, 4,
+    0, 4, 0, 0, 7, 4, 3, 4, 8, 4, 4, 9, 7, 0, 7, 0, 3, 1, 2, 5, 1, 4, 2, 1, 0,
+    8, 5, 4, 7, 1, 5, 2, 0, 2, 0, 0, 3, 7, 1, 7, 4, 2, 2, 4, 8, 5, 3, 5, 1, 5,
+    6, 2, 5, 7, 1, 0, 5, 4, 2, 7, 3, 5, 7, 6, 0, 1, 0, 0, 1, 8, 5, 8, 7, 1, 1,
+    2, 4, 2, 6, 7, 5, 7, 8, 1, 2, 5, 3, 5, 5, 2, 7, 1, 3, 6, 7, 8, 8, 0, 0, 5,
+    0, 0, 9, 2, 9, 3, 5, 5, 6, 2, 1, 3, 3, 7, 8, 9, 0, 6, 2, 5, 1, 7, 7, 6, 3,
+    5, 6, 8, 3, 9, 4, 0, 0, 2, 5, 0, 4, 6, 4, 6, 7, 7, 8, 1, 0, 6, 6, 8, 9, 4,
+    5, 3, 1, 2, 5, 8, 8, 8, 1, 7, 8, 4, 1, 9, 7, 0, 0, 1, 2, 5, 2, 3, 2, 3, 3,
+    8, 9, 0, 5, 3, 3, 4, 4, 7, 2, 6, 5, 6, 2, 5, 4, 4, 4, 0, 8, 9, 2, 0, 9, 8,
+    5, 0, 0, 6, 2, 6, 1, 6, 1, 6, 9, 4, 5, 2, 6, 6, 7, 2, 3, 6, 3, 2, 8, 1, 2,
+    5, 2, 2, 2, 0, 4, 4, 6, 0, 4, 9, 2, 5, 0, 3, 1, 3, 0, 8, 0, 8, 4, 7, 2, 6,
+    3, 3, 3, 6, 1, 8, 1, 6, 4, 0, 6, 2, 5, 1, 1, 1, 0, 2, 2, 3, 0, 2, 4, 6, 2,
+    5, 1, 5, 6, 5, 4, 0, 4, 2, 3, 6, 3, 1, 6, 6, 8, 0, 9, 0, 8, 2, 0, 3, 1, 2,
+    5, 5, 5, 5, 1, 1, 1, 5, 1, 2, 3, 1, 2, 5, 7, 8, 2, 7, 0, 2, 1, 1, 8, 1, 5,
+    8, 3, 4, 0, 4, 5, 4, 1, 0, 1, 5, 6, 2, 5, 2, 7, 7, 5, 5, 5, 7, 5, 6, 1, 5,
+    6, 2, 8, 9, 1, 3, 5, 1, 0, 5, 9, 0, 7, 9, 1, 7, 0, 2, 2, 7, 0, 5, 0, 7, 8,
+    1, 2, 5, 1, 3, 8, 7, 7, 7, 8, 7, 8, 0, 7, 8, 1, 4, 4, 5, 6, 7, 5, 5, 2, 9,
+    5, 3, 9, 5, 8, 5, 1, 1, 3, 5, 2, 5, 3, 9, 0, 6, 2, 5, 6, 9, 3, 8, 8, 9, 3,
+    9, 0, 3, 9, 0, 7, 2, 2, 8, 3, 7, 7, 6, 4, 7, 6, 9, 7, 9, 2, 5, 5, 6, 7, 6,
+    2, 6, 9, 5, 3, 1, 2, 5, 3, 4, 6, 9, 4, 4, 6, 9, 5, 1, 9, 5, 3, 6, 1, 4, 1,
+    8, 8, 8, 2, 3, 8, 4, 8, 9, 6, 2, 7, 8, 3, 8, 1, 3, 4, 7, 6, 5, 6, 2, 5, 1,
+    7, 3, 4, 7, 2, 3, 4, 7, 5, 9, 7, 6, 8, 0, 7, 0, 9, 4, 4, 1, 1, 9, 2, 4, 4,
+    8, 1, 3, 9, 1, 9, 0, 6, 7, 3, 8, 2, 8, 1, 2, 5, 8, 6, 7, 3, 6, 1, 7, 3, 7,
+    9, 8, 8, 4, 0, 3, 5, 4, 7, 2, 0, 5, 9, 6, 2, 2, 4, 0, 6, 9, 5, 9, 5, 3, 3,
+    6, 9, 1, 4, 0, 6, 2, 5,
+};
+
+// --------
+
+// wuffs_base__private_implementation__powers_of_10 contains truncated
+// approximations to the powers of 10, ranging from 1e-307 to 1e+288 inclusive,
+// as 596 pairs of uint64_t values (a 128-bit mantissa).
+//
+// There's also an implicit third column (implied by a linear formula involving
+// the base-10 exponent) that is the base-2 exponent, biased by a magic
+// constant. That constant (1214 or 0x04BE) equals 1023 + 191. 1023 is the bias
+// for IEEE 754 double-precision floating point. 191 is ((3 * 64) - 1) and
+// wuffs_base__private_implementation__parse_number_f64_eisel_lemire works with
+// multiples-of-64-bit mantissas.
+//
+// For example, the third row holds the approximation to 1e-305:
+//   0xE0B62E29_29ABA83C_331ACDAB_FE94DE87 * (2 ** (0x0049 - 0x04BE))
+//
+// Similarly, 1e+4 is approximated by:
+//   0x9C400000_00000000_00000000_00000000 * (2 ** (0x044C - 0x04BE))
+//
+// Similarly, 1e+68 is approximated by:
+//   0xED63A231_D4C4FB27_4CA7AAA8_63EE4BDD * (2 ** (0x0520 - 0x04BE))
+//
+// This table was generated by by script/print-mpb-powers-of-10.go
+static const uint64_t wuffs_base__private_implementation__powers_of_10[596][2] =
+    {
+        {0xA5D3B6D479F8E056, 0x8FD0C16206306BAB},  // 1e-307
+        {0x8F48A4899877186C, 0xB3C4F1BA87BC8696},  // 1e-306
+        {0x331ACDABFE94DE87, 0xE0B62E2929ABA83C},  // 1e-305
+        {0x9FF0C08B7F1D0B14, 0x8C71DCD9BA0B4925},  // 1e-304
+        {0x07ECF0AE5EE44DD9, 0xAF8E5410288E1B6F},  // 1e-303
+        {0xC9E82CD9F69D6150, 0xDB71E91432B1A24A},  // 1e-302
+        {0xBE311C083A225CD2, 0x892731AC9FAF056E},  // 1e-301
+        {0x6DBD630A48AAF406, 0xAB70FE17C79AC6CA},  // 1e-300
+        {0x092CBBCCDAD5B108, 0xD64D3D9DB981787D},  // 1e-299
+        {0x25BBF56008C58EA5, 0x85F0468293F0EB4E},  // 1e-298
+        {0xAF2AF2B80AF6F24E, 0xA76C582338ED2621},  // 1e-297
+        {0x1AF5AF660DB4AEE1, 0xD1476E2C07286FAA},  // 1e-296
+        {0x50D98D9FC890ED4D, 0x82CCA4DB847945CA},  // 1e-295
+        {0xE50FF107BAB528A0, 0xA37FCE126597973C},  // 1e-294
+        {0x1E53ED49A96272C8, 0xCC5FC196FEFD7D0C},  // 1e-293
+        {0x25E8E89C13BB0F7A, 0xFF77B1FCBEBCDC4F},  // 1e-292
+        {0x77B191618C54E9AC, 0x9FAACF3DF73609B1},  // 1e-291
+        {0xD59DF5B9EF6A2417, 0xC795830D75038C1D},  // 1e-290
+        {0x4B0573286B44AD1D, 0xF97AE3D0D2446F25},  // 1e-289
+        {0x4EE367F9430AEC32, 0x9BECCE62836AC577},  // 1e-288
+        {0x229C41F793CDA73F, 0xC2E801FB244576D5},  // 1e-287
+        {0x6B43527578C1110F, 0xF3A20279ED56D48A},  // 1e-286
+        {0x830A13896B78AAA9, 0x9845418C345644D6},  // 1e-285
+        {0x23CC986BC656D553, 0xBE5691EF416BD60C},  // 1e-284
+        {0x2CBFBE86B7EC8AA8, 0xEDEC366B11C6CB8F},  // 1e-283
+        {0x7BF7D71432F3D6A9, 0x94B3A202EB1C3F39},  // 1e-282
+        {0xDAF5CCD93FB0CC53, 0xB9E08A83A5E34F07},  // 1e-281
+        {0xD1B3400F8F9CFF68, 0xE858AD248F5C22C9},  // 1e-280
+        {0x23100809B9C21FA1, 0x91376C36D99995BE},  // 1e-279
+        {0xABD40A0C2832A78A, 0xB58547448FFFFB2D},  // 1e-278
+        {0x16C90C8F323F516C, 0xE2E69915B3FFF9F9},  // 1e-277
+        {0xAE3DA7D97F6792E3, 0x8DD01FAD907FFC3B},  // 1e-276
+        {0x99CD11CFDF41779C, 0xB1442798F49FFB4A},  // 1e-275
+        {0x40405643D711D583, 0xDD95317F31C7FA1D},  // 1e-274
+        {0x482835EA666B2572, 0x8A7D3EEF7F1CFC52},  // 1e-273
+        {0xDA3243650005EECF, 0xAD1C8EAB5EE43B66},  // 1e-272
+        {0x90BED43E40076A82, 0xD863B256369D4A40},  // 1e-271
+        {0x5A7744A6E804A291, 0x873E4F75E2224E68},  // 1e-270
+        {0x711515D0A205CB36, 0xA90DE3535AAAE202},  // 1e-269
+        {0x0D5A5B44CA873E03, 0xD3515C2831559A83},  // 1e-268
+        {0xE858790AFE9486C2, 0x8412D9991ED58091},  // 1e-267
+        {0x626E974DBE39A872, 0xA5178FFF668AE0B6},  // 1e-266
+        {0xFB0A3D212DC8128F, 0xCE5D73FF402D98E3},  // 1e-265
+        {0x7CE66634BC9D0B99, 0x80FA687F881C7F8E},  // 1e-264
+        {0x1C1FFFC1EBC44E80, 0xA139029F6A239F72},  // 1e-263
+        {0xA327FFB266B56220, 0xC987434744AC874E},  // 1e-262
+        {0x4BF1FF9F0062BAA8, 0xFBE9141915D7A922},  // 1e-261
+        {0x6F773FC3603DB4A9, 0x9D71AC8FADA6C9B5},  // 1e-260
+        {0xCB550FB4384D21D3, 0xC4CE17B399107C22},  // 1e-259
+        {0x7E2A53A146606A48, 0xF6019DA07F549B2B},  // 1e-258
+        {0x2EDA7444CBFC426D, 0x99C102844F94E0FB},  // 1e-257
+        {0xFA911155FEFB5308, 0xC0314325637A1939},  // 1e-256
+        {0x793555AB7EBA27CA, 0xF03D93EEBC589F88},  // 1e-255
+        {0x4BC1558B2F3458DE, 0x96267C7535B763B5},  // 1e-254
+        {0x9EB1AAEDFB016F16, 0xBBB01B9283253CA2},  // 1e-253
+        {0x465E15A979C1CADC, 0xEA9C227723EE8BCB},  // 1e-252
+        {0x0BFACD89EC191EC9, 0x92A1958A7675175F},  // 1e-251
+        {0xCEF980EC671F667B, 0xB749FAED14125D36},  // 1e-250
+        {0x82B7E12780E7401A, 0xE51C79A85916F484},  // 1e-249
+        {0xD1B2ECB8B0908810, 0x8F31CC0937AE58D2},  // 1e-248
+        {0x861FA7E6DCB4AA15, 0xB2FE3F0B8599EF07},  // 1e-247
+        {0x67A791E093E1D49A, 0xDFBDCECE67006AC9},  // 1e-246
+        {0xE0C8BB2C5C6D24E0, 0x8BD6A141006042BD},  // 1e-245
+        {0x58FAE9F773886E18, 0xAECC49914078536D},  // 1e-244
+        {0xAF39A475506A899E, 0xDA7F5BF590966848},  // 1e-243
+        {0x6D8406C952429603, 0x888F99797A5E012D},  // 1e-242
+        {0xC8E5087BA6D33B83, 0xAAB37FD7D8F58178},  // 1e-241
+        {0xFB1E4A9A90880A64, 0xD5605FCDCF32E1D6},  // 1e-240
+        {0x5CF2EEA09A55067F, 0x855C3BE0A17FCD26},  // 1e-239
+        {0xF42FAA48C0EA481E, 0xA6B34AD8C9DFC06F},  // 1e-238
+        {0xF13B94DAF124DA26, 0xD0601D8EFC57B08B},  // 1e-237
+        {0x76C53D08D6B70858, 0x823C12795DB6CE57},  // 1e-236
+        {0x54768C4B0C64CA6E, 0xA2CB1717B52481ED},  // 1e-235
+        {0xA9942F5DCF7DFD09, 0xCB7DDCDDA26DA268},  // 1e-234
+        {0xD3F93B35435D7C4C, 0xFE5D54150B090B02},  // 1e-233
+        {0xC47BC5014A1A6DAF, 0x9EFA548D26E5A6E1},  // 1e-232
+        {0x359AB6419CA1091B, 0xC6B8E9B0709F109A},  // 1e-231
+        {0xC30163D203C94B62, 0xF867241C8CC6D4C0},  // 1e-230
+        {0x79E0DE63425DCF1D, 0x9B407691D7FC44F8},  // 1e-229
+        {0x985915FC12F542E4, 0xC21094364DFB5636},  // 1e-228
+        {0x3E6F5B7B17B2939D, 0xF294B943E17A2BC4},  // 1e-227
+        {0xA705992CEECF9C42, 0x979CF3CA6CEC5B5A},  // 1e-226
+        {0x50C6FF782A838353, 0xBD8430BD08277231},  // 1e-225
+        {0xA4F8BF5635246428, 0xECE53CEC4A314EBD},  // 1e-224
+        {0x871B7795E136BE99, 0x940F4613AE5ED136},  // 1e-223
+        {0x28E2557B59846E3F, 0xB913179899F68584},  // 1e-222
+        {0x331AEADA2FE589CF, 0xE757DD7EC07426E5},  // 1e-221
+        {0x3FF0D2C85DEF7621, 0x9096EA6F3848984F},  // 1e-220
+        {0x0FED077A756B53A9, 0xB4BCA50B065ABE63},  // 1e-219
+        {0xD3E8495912C62894, 0xE1EBCE4DC7F16DFB},  // 1e-218
+        {0x64712DD7ABBBD95C, 0x8D3360F09CF6E4BD},  // 1e-217
+        {0xBD8D794D96AACFB3, 0xB080392CC4349DEC},  // 1e-216
+        {0xECF0D7A0FC5583A0, 0xDCA04777F541C567},  // 1e-215
+        {0xF41686C49DB57244, 0x89E42CAAF9491B60},  // 1e-214
+        {0x311C2875C522CED5, 0xAC5D37D5B79B6239},  // 1e-213
+        {0x7D633293366B828B, 0xD77485CB25823AC7},  // 1e-212
+        {0xAE5DFF9C02033197, 0x86A8D39EF77164BC},  // 1e-211
+        {0xD9F57F830283FDFC, 0xA8530886B54DBDEB},  // 1e-210
+        {0xD072DF63C324FD7B, 0xD267CAA862A12D66},  // 1e-209
+        {0x4247CB9E59F71E6D, 0x8380DEA93DA4BC60},  // 1e-208
+        {0x52D9BE85F074E608, 0xA46116538D0DEB78},  // 1e-207
+        {0x67902E276C921F8B, 0xCD795BE870516656},  // 1e-206
+        {0x00BA1CD8A3DB53B6, 0x806BD9714632DFF6},  // 1e-205
+        {0x80E8A40ECCD228A4, 0xA086CFCD97BF97F3},  // 1e-204
+        {0x6122CD128006B2CD, 0xC8A883C0FDAF7DF0},  // 1e-203
+        {0x796B805720085F81, 0xFAD2A4B13D1B5D6C},  // 1e-202
+        {0xCBE3303674053BB0, 0x9CC3A6EEC6311A63},  // 1e-201
+        {0xBEDBFC4411068A9C, 0xC3F490AA77BD60FC},  // 1e-200
+        {0xEE92FB5515482D44, 0xF4F1B4D515ACB93B},  // 1e-199
+        {0x751BDD152D4D1C4A, 0x991711052D8BF3C5},  // 1e-198
+        {0xD262D45A78A0635D, 0xBF5CD54678EEF0B6},  // 1e-197
+        {0x86FB897116C87C34, 0xEF340A98172AACE4},  // 1e-196
+        {0xD45D35E6AE3D4DA0, 0x9580869F0E7AAC0E},  // 1e-195
+        {0x8974836059CCA109, 0xBAE0A846D2195712},  // 1e-194
+        {0x2BD1A438703FC94B, 0xE998D258869FACD7},  // 1e-193
+        {0x7B6306A34627DDCF, 0x91FF83775423CC06},  // 1e-192
+        {0x1A3BC84C17B1D542, 0xB67F6455292CBF08},  // 1e-191
+        {0x20CABA5F1D9E4A93, 0xE41F3D6A7377EECA},  // 1e-190
+        {0x547EB47B7282EE9C, 0x8E938662882AF53E},  // 1e-189
+        {0xE99E619A4F23AA43, 0xB23867FB2A35B28D},  // 1e-188
+        {0x6405FA00E2EC94D4, 0xDEC681F9F4C31F31},  // 1e-187
+        {0xDE83BC408DD3DD04, 0x8B3C113C38F9F37E},  // 1e-186
+        {0x9624AB50B148D445, 0xAE0B158B4738705E},  // 1e-185
+        {0x3BADD624DD9B0957, 0xD98DDAEE19068C76},  // 1e-184
+        {0xE54CA5D70A80E5D6, 0x87F8A8D4CFA417C9},  // 1e-183
+        {0x5E9FCF4CCD211F4C, 0xA9F6D30A038D1DBC},  // 1e-182
+        {0x7647C3200069671F, 0xD47487CC8470652B},  // 1e-181
+        {0x29ECD9F40041E073, 0x84C8D4DFD2C63F3B},  // 1e-180
+        {0xF468107100525890, 0xA5FB0A17C777CF09},  // 1e-179
+        {0x7182148D4066EEB4, 0xCF79CC9DB955C2CC},  // 1e-178
+        {0xC6F14CD848405530, 0x81AC1FE293D599BF},  // 1e-177
+        {0xB8ADA00E5A506A7C, 0xA21727DB38CB002F},  // 1e-176
+        {0xA6D90811F0E4851C, 0xCA9CF1D206FDC03B},  // 1e-175
+        {0x908F4A166D1DA663, 0xFD442E4688BD304A},  // 1e-174
+        {0x9A598E4E043287FE, 0x9E4A9CEC15763E2E},  // 1e-173
+        {0x40EFF1E1853F29FD, 0xC5DD44271AD3CDBA},  // 1e-172
+        {0xD12BEE59E68EF47C, 0xF7549530E188C128},  // 1e-171
+        {0x82BB74F8301958CE, 0x9A94DD3E8CF578B9},  // 1e-170
+        {0xE36A52363C1FAF01, 0xC13A148E3032D6E7},  // 1e-169
+        {0xDC44E6C3CB279AC1, 0xF18899B1BC3F8CA1},  // 1e-168
+        {0x29AB103A5EF8C0B9, 0x96F5600F15A7B7E5},  // 1e-167
+        {0x7415D448F6B6F0E7, 0xBCB2B812DB11A5DE},  // 1e-166
+        {0x111B495B3464AD21, 0xEBDF661791D60F56},  // 1e-165
+        {0xCAB10DD900BEEC34, 0x936B9FCEBB25C995},  // 1e-164
+        {0x3D5D514F40EEA742, 0xB84687C269EF3BFB},  // 1e-163
+        {0x0CB4A5A3112A5112, 0xE65829B3046B0AFA},  // 1e-162
+        {0x47F0E785EABA72AB, 0x8FF71A0FE2C2E6DC},  // 1e-161
+        {0x59ED216765690F56, 0xB3F4E093DB73A093},  // 1e-160
+        {0x306869C13EC3532C, 0xE0F218B8D25088B8},  // 1e-159
+        {0x1E414218C73A13FB, 0x8C974F7383725573},  // 1e-158
+        {0xE5D1929EF90898FA, 0xAFBD2350644EEACF},  // 1e-157
+        {0xDF45F746B74ABF39, 0xDBAC6C247D62A583},  // 1e-156
+        {0x6B8BBA8C328EB783, 0x894BC396CE5DA772},  // 1e-155
+        {0x066EA92F3F326564, 0xAB9EB47C81F5114F},  // 1e-154
+        {0xC80A537B0EFEFEBD, 0xD686619BA27255A2},  // 1e-153
+        {0xBD06742CE95F5F36, 0x8613FD0145877585},  // 1e-152
+        {0x2C48113823B73704, 0xA798FC4196E952E7},  // 1e-151
+        {0xF75A15862CA504C5, 0xD17F3B51FCA3A7A0},  // 1e-150
+        {0x9A984D73DBE722FB, 0x82EF85133DE648C4},  // 1e-149
+        {0xC13E60D0D2E0EBBA, 0xA3AB66580D5FDAF5},  // 1e-148
+        {0x318DF905079926A8, 0xCC963FEE10B7D1B3},  // 1e-147
+        {0xFDF17746497F7052, 0xFFBBCFE994E5C61F},  // 1e-146
+        {0xFEB6EA8BEDEFA633, 0x9FD561F1FD0F9BD3},  // 1e-145
+        {0xFE64A52EE96B8FC0, 0xC7CABA6E7C5382C8},  // 1e-144
+        {0x3DFDCE7AA3C673B0, 0xF9BD690A1B68637B},  // 1e-143
+        {0x06BEA10CA65C084E, 0x9C1661A651213E2D},  // 1e-142
+        {0x486E494FCFF30A62, 0xC31BFA0FE5698DB8},  // 1e-141
+        {0x5A89DBA3C3EFCCFA, 0xF3E2F893DEC3F126},  // 1e-140
+        {0xF89629465A75E01C, 0x986DDB5C6B3A76B7},  // 1e-139
+        {0xF6BBB397F1135823, 0xBE89523386091465},  // 1e-138
+        {0x746AA07DED582E2C, 0xEE2BA6C0678B597F},  // 1e-137
+        {0xA8C2A44EB4571CDC, 0x94DB483840B717EF},  // 1e-136
+        {0x92F34D62616CE413, 0xBA121A4650E4DDEB},  // 1e-135
+        {0x77B020BAF9C81D17, 0xE896A0D7E51E1566},  // 1e-134
+        {0x0ACE1474DC1D122E, 0x915E2486EF32CD60},  // 1e-133
+        {0x0D819992132456BA, 0xB5B5ADA8AAFF80B8},  // 1e-132
+        {0x10E1FFF697ED6C69, 0xE3231912D5BF60E6},  // 1e-131
+        {0xCA8D3FFA1EF463C1, 0x8DF5EFABC5979C8F},  // 1e-130
+        {0xBD308FF8A6B17CB2, 0xB1736B96B6FD83B3},  // 1e-129
+        {0xAC7CB3F6D05DDBDE, 0xDDD0467C64BCE4A0},  // 1e-128
+        {0x6BCDF07A423AA96B, 0x8AA22C0DBEF60EE4},  // 1e-127
+        {0x86C16C98D2C953C6, 0xAD4AB7112EB3929D},  // 1e-126
+        {0xE871C7BF077BA8B7, 0xD89D64D57A607744},  // 1e-125
+        {0x11471CD764AD4972, 0x87625F056C7C4A8B},  // 1e-124
+        {0xD598E40D3DD89BCF, 0xA93AF6C6C79B5D2D},  // 1e-123
+        {0x4AFF1D108D4EC2C3, 0xD389B47879823479},  // 1e-122
+        {0xCEDF722A585139BA, 0x843610CB4BF160CB},  // 1e-121
+        {0xC2974EB4EE658828, 0xA54394FE1EEDB8FE},  // 1e-120
+        {0x733D226229FEEA32, 0xCE947A3DA6A9273E},  // 1e-119
+        {0x0806357D5A3F525F, 0x811CCC668829B887},  // 1e-118
+        {0xCA07C2DCB0CF26F7, 0xA163FF802A3426A8},  // 1e-117
+        {0xFC89B393DD02F0B5, 0xC9BCFF6034C13052},  // 1e-116
+        {0xBBAC2078D443ACE2, 0xFC2C3F3841F17C67},  // 1e-115
+        {0xD54B944B84AA4C0D, 0x9D9BA7832936EDC0},  // 1e-114
+        {0x0A9E795E65D4DF11, 0xC5029163F384A931},  // 1e-113
+        {0x4D4617B5FF4A16D5, 0xF64335BCF065D37D},  // 1e-112
+        {0x504BCED1BF8E4E45, 0x99EA0196163FA42E},  // 1e-111
+        {0xE45EC2862F71E1D6, 0xC06481FB9BCF8D39},  // 1e-110
+        {0x5D767327BB4E5A4C, 0xF07DA27A82C37088},  // 1e-109
+        {0x3A6A07F8D510F86F, 0x964E858C91BA2655},  // 1e-108
+        {0x890489F70A55368B, 0xBBE226EFB628AFEA},  // 1e-107
+        {0x2B45AC74CCEA842E, 0xEADAB0ABA3B2DBE5},  // 1e-106
+        {0x3B0B8BC90012929D, 0x92C8AE6B464FC96F},  // 1e-105
+        {0x09CE6EBB40173744, 0xB77ADA0617E3BBCB},  // 1e-104
+        {0xCC420A6A101D0515, 0xE55990879DDCAABD},  // 1e-103
+        {0x9FA946824A12232D, 0x8F57FA54C2A9EAB6},  // 1e-102
+        {0x47939822DC96ABF9, 0xB32DF8E9F3546564},  // 1e-101
+        {0x59787E2B93BC56F7, 0xDFF9772470297EBD},  // 1e-100
+        {0x57EB4EDB3C55B65A, 0x8BFBEA76C619EF36},  // 1e-99
+        {0xEDE622920B6B23F1, 0xAEFAE51477A06B03},  // 1e-98
+        {0xE95FAB368E45ECED, 0xDAB99E59958885C4},  // 1e-97
+        {0x11DBCB0218EBB414, 0x88B402F7FD75539B},  // 1e-96
+        {0xD652BDC29F26A119, 0xAAE103B5FCD2A881},  // 1e-95
+        {0x4BE76D3346F0495F, 0xD59944A37C0752A2},  // 1e-94
+        {0x6F70A4400C562DDB, 0x857FCAE62D8493A5},  // 1e-93
+        {0xCB4CCD500F6BB952, 0xA6DFBD9FB8E5B88E},  // 1e-92
+        {0x7E2000A41346A7A7, 0xD097AD07A71F26B2},  // 1e-91
+        {0x8ED400668C0C28C8, 0x825ECC24C873782F},  // 1e-90
+        {0x728900802F0F32FA, 0xA2F67F2DFA90563B},  // 1e-89
+        {0x4F2B40A03AD2FFB9, 0xCBB41EF979346BCA},  // 1e-88
+        {0xE2F610C84987BFA8, 0xFEA126B7D78186BC},  // 1e-87
+        {0x0DD9CA7D2DF4D7C9, 0x9F24B832E6B0F436},  // 1e-86
+        {0x91503D1C79720DBB, 0xC6EDE63FA05D3143},  // 1e-85
+        {0x75A44C6397CE912A, 0xF8A95FCF88747D94},  // 1e-84
+        {0xC986AFBE3EE11ABA, 0x9B69DBE1B548CE7C},  // 1e-83
+        {0xFBE85BADCE996168, 0xC24452DA229B021B},  // 1e-82
+        {0xFAE27299423FB9C3, 0xF2D56790AB41C2A2},  // 1e-81
+        {0xDCCD879FC967D41A, 0x97C560BA6B0919A5},  // 1e-80
+        {0x5400E987BBC1C920, 0xBDB6B8E905CB600F},  // 1e-79
+        {0x290123E9AAB23B68, 0xED246723473E3813},  // 1e-78
+        {0xF9A0B6720AAF6521, 0x9436C0760C86E30B},  // 1e-77
+        {0xF808E40E8D5B3E69, 0xB94470938FA89BCE},  // 1e-76
+        {0xB60B1D1230B20E04, 0xE7958CB87392C2C2},  // 1e-75
+        {0xB1C6F22B5E6F48C2, 0x90BD77F3483BB9B9},  // 1e-74
+        {0x1E38AEB6360B1AF3, 0xB4ECD5F01A4AA828},  // 1e-73
+        {0x25C6DA63C38DE1B0, 0xE2280B6C20DD5232},  // 1e-72
+        {0x579C487E5A38AD0E, 0x8D590723948A535F},  // 1e-71
+        {0x2D835A9DF0C6D851, 0xB0AF48EC79ACE837},  // 1e-70
+        {0xF8E431456CF88E65, 0xDCDB1B2798182244},  // 1e-69
+        {0x1B8E9ECB641B58FF, 0x8A08F0F8BF0F156B},  // 1e-68
+        {0xE272467E3D222F3F, 0xAC8B2D36EED2DAC5},  // 1e-67
+        {0x5B0ED81DCC6ABB0F, 0xD7ADF884AA879177},  // 1e-66
+        {0x98E947129FC2B4E9, 0x86CCBB52EA94BAEA},  // 1e-65
+        {0x3F2398D747B36224, 0xA87FEA27A539E9A5},  // 1e-64
+        {0x8EEC7F0D19A03AAD, 0xD29FE4B18E88640E},  // 1e-63
+        {0x1953CF68300424AC, 0x83A3EEEEF9153E89},  // 1e-62
+        {0x5FA8C3423C052DD7, 0xA48CEAAAB75A8E2B},  // 1e-61
+        {0x3792F412CB06794D, 0xCDB02555653131B6},  // 1e-60
+        {0xE2BBD88BBEE40BD0, 0x808E17555F3EBF11},  // 1e-59
+        {0x5B6ACEAEAE9D0EC4, 0xA0B19D2AB70E6ED6},  // 1e-58
+        {0xF245825A5A445275, 0xC8DE047564D20A8B},  // 1e-57
+        {0xEED6E2F0F0D56712, 0xFB158592BE068D2E},  // 1e-56
+        {0x55464DD69685606B, 0x9CED737BB6C4183D},  // 1e-55
+        {0xAA97E14C3C26B886, 0xC428D05AA4751E4C},  // 1e-54
+        {0xD53DD99F4B3066A8, 0xF53304714D9265DF},  // 1e-53
+        {0xE546A8038EFE4029, 0x993FE2C6D07B7FAB},  // 1e-52
+        {0xDE98520472BDD033, 0xBF8FDB78849A5F96},  // 1e-51
+        {0x963E66858F6D4440, 0xEF73D256A5C0F77C},  // 1e-50
+        {0xDDE7001379A44AA8, 0x95A8637627989AAD},  // 1e-49
+        {0x5560C018580D5D52, 0xBB127C53B17EC159},  // 1e-48
+        {0xAAB8F01E6E10B4A6, 0xE9D71B689DDE71AF},  // 1e-47
+        {0xCAB3961304CA70E8, 0x9226712162AB070D},  // 1e-46
+        {0x3D607B97C5FD0D22, 0xB6B00D69BB55C8D1},  // 1e-45
+        {0x8CB89A7DB77C506A, 0xE45C10C42A2B3B05},  // 1e-44
+        {0x77F3608E92ADB242, 0x8EB98A7A9A5B04E3},  // 1e-43
+        {0x55F038B237591ED3, 0xB267ED1940F1C61C},  // 1e-42
+        {0x6B6C46DEC52F6688, 0xDF01E85F912E37A3},  // 1e-41
+        {0x2323AC4B3B3DA015, 0x8B61313BBABCE2C6},  // 1e-40
+        {0xABEC975E0A0D081A, 0xAE397D8AA96C1B77},  // 1e-39
+        {0x96E7BD358C904A21, 0xD9C7DCED53C72255},  // 1e-38
+        {0x7E50D64177DA2E54, 0x881CEA14545C7575},  // 1e-37
+        {0xDDE50BD1D5D0B9E9, 0xAA242499697392D2},  // 1e-36
+        {0x955E4EC64B44E864, 0xD4AD2DBFC3D07787},  // 1e-35
+        {0xBD5AF13BEF0B113E, 0x84EC3C97DA624AB4},  // 1e-34
+        {0xECB1AD8AEACDD58E, 0xA6274BBDD0FADD61},  // 1e-33
+        {0x67DE18EDA5814AF2, 0xCFB11EAD453994BA},  // 1e-32
+        {0x80EACF948770CED7, 0x81CEB32C4B43FCF4},  // 1e-31
+        {0xA1258379A94D028D, 0xA2425FF75E14FC31},  // 1e-30
+        {0x096EE45813A04330, 0xCAD2F7F5359A3B3E},  // 1e-29
+        {0x8BCA9D6E188853FC, 0xFD87B5F28300CA0D},  // 1e-28
+        {0x775EA264CF55347D, 0x9E74D1B791E07E48},  // 1e-27
+        {0x95364AFE032A819D, 0xC612062576589DDA},  // 1e-26
+        {0x3A83DDBD83F52204, 0xF79687AED3EEC551},  // 1e-25
+        {0xC4926A9672793542, 0x9ABE14CD44753B52},  // 1e-24
+        {0x75B7053C0F178293, 0xC16D9A0095928A27},  // 1e-23
+        {0x5324C68B12DD6338, 0xF1C90080BAF72CB1},  // 1e-22
+        {0xD3F6FC16EBCA5E03, 0x971DA05074DA7BEE},  // 1e-21
+        {0x88F4BB1CA6BCF584, 0xBCE5086492111AEA},  // 1e-20
+        {0x2B31E9E3D06C32E5, 0xEC1E4A7DB69561A5},  // 1e-19
+        {0x3AFF322E62439FCF, 0x9392EE8E921D5D07},  // 1e-18
+        {0x09BEFEB9FAD487C2, 0xB877AA3236A4B449},  // 1e-17
+        {0x4C2EBE687989A9B3, 0xE69594BEC44DE15B},  // 1e-16
+        {0x0F9D37014BF60A10, 0x901D7CF73AB0ACD9},  // 1e-15
+        {0x538484C19EF38C94, 0xB424DC35095CD80F},  // 1e-14
+        {0x2865A5F206B06FB9, 0xE12E13424BB40E13},  // 1e-13
+        {0xF93F87B7442E45D3, 0x8CBCCC096F5088CB},  // 1e-12
+        {0xF78F69A51539D748, 0xAFEBFF0BCB24AAFE},  // 1e-11
+        {0xB573440E5A884D1B, 0xDBE6FECEBDEDD5BE},  // 1e-10
+        {0x31680A88F8953030, 0x89705F4136B4A597},  // 1e-9
+        {0xFDC20D2B36BA7C3D, 0xABCC77118461CEFC},  // 1e-8
+        {0x3D32907604691B4C, 0xD6BF94D5E57A42BC},  // 1e-7
+        {0xA63F9A49C2C1B10F, 0x8637BD05AF6C69B5},  // 1e-6
+        {0x0FCF80DC33721D53, 0xA7C5AC471B478423},  // 1e-5
+        {0xD3C36113404EA4A8, 0xD1B71758E219652B},  // 1e-4
+        {0x645A1CAC083126E9, 0x83126E978D4FDF3B},  // 1e-3
+        {0x3D70A3D70A3D70A3, 0xA3D70A3D70A3D70A},  // 1e-2
+        {0xCCCCCCCCCCCCCCCC, 0xCCCCCCCCCCCCCCCC},  // 1e-1
+        {0x0000000000000000, 0x8000000000000000},  // 1e0
+        {0x0000000000000000, 0xA000000000000000},  // 1e1
+        {0x0000000000000000, 0xC800000000000000},  // 1e2
+        {0x0000000000000000, 0xFA00000000000000},  // 1e3
+        {0x0000000000000000, 0x9C40000000000000},  // 1e4
+        {0x0000000000000000, 0xC350000000000000},  // 1e5
+        {0x0000000000000000, 0xF424000000000000},  // 1e6
+        {0x0000000000000000, 0x9896800000000000},  // 1e7
+        {0x0000000000000000, 0xBEBC200000000000},  // 1e8
+        {0x0000000000000000, 0xEE6B280000000000},  // 1e9
+        {0x0000000000000000, 0x9502F90000000000},  // 1e10
+        {0x0000000000000000, 0xBA43B74000000000},  // 1e11
+        {0x0000000000000000, 0xE8D4A51000000000},  // 1e12
+        {0x0000000000000000, 0x9184E72A00000000},  // 1e13
+        {0x0000000000000000, 0xB5E620F480000000},  // 1e14
+        {0x0000000000000000, 0xE35FA931A0000000},  // 1e15
+        {0x0000000000000000, 0x8E1BC9BF04000000},  // 1e16
+        {0x0000000000000000, 0xB1A2BC2EC5000000},  // 1e17
+        {0x0000000000000000, 0xDE0B6B3A76400000},  // 1e18
+        {0x0000000000000000, 0x8AC7230489E80000},  // 1e19
+        {0x0000000000000000, 0xAD78EBC5AC620000},  // 1e20
+        {0x0000000000000000, 0xD8D726B7177A8000},  // 1e21
+        {0x0000000000000000, 0x878678326EAC9000},  // 1e22
+        {0x0000000000000000, 0xA968163F0A57B400},  // 1e23
+        {0x0000000000000000, 0xD3C21BCECCEDA100},  // 1e24
+        {0x0000000000000000, 0x84595161401484A0},  // 1e25
+        {0x0000000000000000, 0xA56FA5B99019A5C8},  // 1e26
+        {0x0000000000000000, 0xCECB8F27F4200F3A},  // 1e27
+        {0x4000000000000000, 0x813F3978F8940984},  // 1e28
+        {0x5000000000000000, 0xA18F07D736B90BE5},  // 1e29
+        {0xA400000000000000, 0xC9F2C9CD04674EDE},  // 1e30
+        {0x4D00000000000000, 0xFC6F7C4045812296},  // 1e31
+        {0xF020000000000000, 0x9DC5ADA82B70B59D},  // 1e32
+        {0x6C28000000000000, 0xC5371912364CE305},  // 1e33
+        {0xC732000000000000, 0xF684DF56C3E01BC6},  // 1e34
+        {0x3C7F400000000000, 0x9A130B963A6C115C},  // 1e35
+        {0x4B9F100000000000, 0xC097CE7BC90715B3},  // 1e36
+        {0x1E86D40000000000, 0xF0BDC21ABB48DB20},  // 1e37
+        {0x1314448000000000, 0x96769950B50D88F4},  // 1e38
+        {0x17D955A000000000, 0xBC143FA4E250EB31},  // 1e39
+        {0x5DCFAB0800000000, 0xEB194F8E1AE525FD},  // 1e40
+        {0x5AA1CAE500000000, 0x92EFD1B8D0CF37BE},  // 1e41
+        {0xF14A3D9E40000000, 0xB7ABC627050305AD},  // 1e42
+        {0x6D9CCD05D0000000, 0xE596B7B0C643C719},  // 1e43
+        {0xE4820023A2000000, 0x8F7E32CE7BEA5C6F},  // 1e44
+        {0xDDA2802C8A800000, 0xB35DBF821AE4F38B},  // 1e45
+        {0xD50B2037AD200000, 0xE0352F62A19E306E},  // 1e46
+        {0x4526F422CC340000, 0x8C213D9DA502DE45},  // 1e47
+        {0x9670B12B7F410000, 0xAF298D050E4395D6},  // 1e48
+        {0x3C0CDD765F114000, 0xDAF3F04651D47B4C},  // 1e49
+        {0xA5880A69FB6AC800, 0x88D8762BF324CD0F},  // 1e50
+        {0x8EEA0D047A457A00, 0xAB0E93B6EFEE0053},  // 1e51
+        {0x72A4904598D6D880, 0xD5D238A4ABE98068},  // 1e52
+        {0x47A6DA2B7F864750, 0x85A36366EB71F041},  // 1e53
+        {0x999090B65F67D924, 0xA70C3C40A64E6C51},  // 1e54
+        {0xFFF4B4E3F741CF6D, 0xD0CF4B50CFE20765},  // 1e55
+        {0xBFF8F10E7A8921A4, 0x82818F1281ED449F},  // 1e56
+        {0xAFF72D52192B6A0D, 0xA321F2D7226895C7},  // 1e57
+        {0x9BF4F8A69F764490, 0xCBEA6F8CEB02BB39},  // 1e58
+        {0x02F236D04753D5B4, 0xFEE50B7025C36A08},  // 1e59
+        {0x01D762422C946590, 0x9F4F2726179A2245},  // 1e60
+        {0x424D3AD2B7B97EF5, 0xC722F0EF9D80AAD6},  // 1e61
+        {0xD2E0898765A7DEB2, 0xF8EBAD2B84E0D58B},  // 1e62
+        {0x63CC55F49F88EB2F, 0x9B934C3B330C8577},  // 1e63
+        {0x3CBF6B71C76B25FB, 0xC2781F49FFCFA6D5},  // 1e64
+        {0x8BEF464E3945EF7A, 0xF316271C7FC3908A},  // 1e65
+        {0x97758BF0E3CBB5AC, 0x97EDD871CFDA3A56},  // 1e66
+        {0x3D52EEED1CBEA317, 0xBDE94E8E43D0C8EC},  // 1e67
+        {0x4CA7AAA863EE4BDD, 0xED63A231D4C4FB27},  // 1e68
+        {0x8FE8CAA93E74EF6A, 0x945E455F24FB1CF8},  // 1e69
+        {0xB3E2FD538E122B44, 0xB975D6B6EE39E436},  // 1e70
+        {0x60DBBCA87196B616, 0xE7D34C64A9C85D44},  // 1e71
+        {0xBC8955E946FE31CD, 0x90E40FBEEA1D3A4A},  // 1e72
+        {0x6BABAB6398BDBE41, 0xB51D13AEA4A488DD},  // 1e73
+        {0xC696963C7EED2DD1, 0xE264589A4DCDAB14},  // 1e74
+        {0xFC1E1DE5CF543CA2, 0x8D7EB76070A08AEC},  // 1e75
+        {0x3B25A55F43294BCB, 0xB0DE65388CC8ADA8},  // 1e76
+        {0x49EF0EB713F39EBE, 0xDD15FE86AFFAD912},  // 1e77
+        {0x6E3569326C784337, 0x8A2DBF142DFCC7AB},  // 1e78
+        {0x49C2C37F07965404, 0xACB92ED9397BF996},  // 1e79
+        {0xDC33745EC97BE906, 0xD7E77A8F87DAF7FB},  // 1e80
+        {0x69A028BB3DED71A3, 0x86F0AC99B4E8DAFD},  // 1e81
+        {0xC40832EA0D68CE0C, 0xA8ACD7C0222311BC},  // 1e82
+        {0xF50A3FA490C30190, 0xD2D80DB02AABD62B},  // 1e83
+        {0x792667C6DA79E0FA, 0x83C7088E1AAB65DB},  // 1e84
+        {0x577001B891185938, 0xA4B8CAB1A1563F52},  // 1e85
+        {0xED4C0226B55E6F86, 0xCDE6FD5E09ABCF26},  // 1e86
+        {0x544F8158315B05B4, 0x80B05E5AC60B6178},  // 1e87
+        {0x696361AE3DB1C721, 0xA0DC75F1778E39D6},  // 1e88
+        {0x03BC3A19CD1E38E9, 0xC913936DD571C84C},  // 1e89
+        {0x04AB48A04065C723, 0xFB5878494ACE3A5F},  // 1e90
+        {0x62EB0D64283F9C76, 0x9D174B2DCEC0E47B},  // 1e91
+        {0x3BA5D0BD324F8394, 0xC45D1DF942711D9A},  // 1e92
+        {0xCA8F44EC7EE36479, 0xF5746577930D6500},  // 1e93
+        {0x7E998B13CF4E1ECB, 0x9968BF6ABBE85F20},  // 1e94
+        {0x9E3FEDD8C321A67E, 0xBFC2EF456AE276E8},  // 1e95
+        {0xC5CFE94EF3EA101E, 0xEFB3AB16C59B14A2},  // 1e96
+        {0xBBA1F1D158724A12, 0x95D04AEE3B80ECE5},  // 1e97
+        {0x2A8A6E45AE8EDC97, 0xBB445DA9CA61281F},  // 1e98
+        {0xF52D09D71A3293BD, 0xEA1575143CF97226},  // 1e99
+        {0x593C2626705F9C56, 0x924D692CA61BE758},  // 1e100
+        {0x6F8B2FB00C77836C, 0xB6E0C377CFA2E12E},  // 1e101
+        {0x0B6DFB9C0F956447, 0xE498F455C38B997A},  // 1e102
+        {0x4724BD4189BD5EAC, 0x8EDF98B59A373FEC},  // 1e103
+        {0x58EDEC91EC2CB657, 0xB2977EE300C50FE7},  // 1e104
+        {0x2F2967B66737E3ED, 0xDF3D5E9BC0F653E1},  // 1e105
+        {0xBD79E0D20082EE74, 0x8B865B215899F46C},  // 1e106
+        {0xECD8590680A3AA11, 0xAE67F1E9AEC07187},  // 1e107
+        {0xE80E6F4820CC9495, 0xDA01EE641A708DE9},  // 1e108
+        {0x3109058D147FDCDD, 0x884134FE908658B2},  // 1e109
+        {0xBD4B46F0599FD415, 0xAA51823E34A7EEDE},  // 1e110
+        {0x6C9E18AC7007C91A, 0xD4E5E2CDC1D1EA96},  // 1e111
+        {0x03E2CF6BC604DDB0, 0x850FADC09923329E},  // 1e112
+        {0x84DB8346B786151C, 0xA6539930BF6BFF45},  // 1e113
+        {0xE612641865679A63, 0xCFE87F7CEF46FF16},  // 1e114
+        {0x4FCB7E8F3F60C07E, 0x81F14FAE158C5F6E},  // 1e115
+        {0xE3BE5E330F38F09D, 0xA26DA3999AEF7749},  // 1e116
+        {0x5CADF5BFD3072CC5, 0xCB090C8001AB551C},  // 1e117
+        {0x73D9732FC7C8F7F6, 0xFDCB4FA002162A63},  // 1e118
+        {0x2867E7FDDCDD9AFA, 0x9E9F11C4014DDA7E},  // 1e119
+        {0xB281E1FD541501B8, 0xC646D63501A1511D},  // 1e120
+        {0x1F225A7CA91A4226, 0xF7D88BC24209A565},  // 1e121
+        {0x3375788DE9B06958, 0x9AE757596946075F},  // 1e122
+        {0x0052D6B1641C83AE, 0xC1A12D2FC3978937},  // 1e123
+        {0xC0678C5DBD23A49A, 0xF209787BB47D6B84},  // 1e124
+        {0xF840B7BA963646E0, 0x9745EB4D50CE6332},  // 1e125
+        {0xB650E5A93BC3D898, 0xBD176620A501FBFF},  // 1e126
+        {0xA3E51F138AB4CEBE, 0xEC5D3FA8CE427AFF},  // 1e127
+        {0xC66F336C36B10137, 0x93BA47C980E98CDF},  // 1e128
+        {0xB80B0047445D4184, 0xB8A8D9BBE123F017},  // 1e129
+        {0xA60DC059157491E5, 0xE6D3102AD96CEC1D},  // 1e130
+        {0x87C89837AD68DB2F, 0x9043EA1AC7E41392},  // 1e131
+        {0x29BABE4598C311FB, 0xB454E4A179DD1877},  // 1e132
+        {0xF4296DD6FEF3D67A, 0xE16A1DC9D8545E94},  // 1e133
+        {0x1899E4A65F58660C, 0x8CE2529E2734BB1D},  // 1e134
+        {0x5EC05DCFF72E7F8F, 0xB01AE745B101E9E4},  // 1e135
+        {0x76707543F4FA1F73, 0xDC21A1171D42645D},  // 1e136
+        {0x6A06494A791C53A8, 0x899504AE72497EBA},  // 1e137
+        {0x0487DB9D17636892, 0xABFA45DA0EDBDE69},  // 1e138
+        {0x45A9D2845D3C42B6, 0xD6F8D7509292D603},  // 1e139
+        {0x0B8A2392BA45A9B2, 0x865B86925B9BC5C2},  // 1e140
+        {0x8E6CAC7768D7141E, 0xA7F26836F282B732},  // 1e141
+        {0x3207D795430CD926, 0xD1EF0244AF2364FF},  // 1e142
+        {0x7F44E6BD49E807B8, 0x8335616AED761F1F},  // 1e143
+        {0x5F16206C9C6209A6, 0xA402B9C5A8D3A6E7},  // 1e144
+        {0x36DBA887C37A8C0F, 0xCD036837130890A1},  // 1e145
+        {0xC2494954DA2C9789, 0x802221226BE55A64},  // 1e146
+        {0xF2DB9BAA10B7BD6C, 0xA02AA96B06DEB0FD},  // 1e147
+        {0x6F92829494E5ACC7, 0xC83553C5C8965D3D},  // 1e148
+        {0xCB772339BA1F17F9, 0xFA42A8B73ABBF48C},  // 1e149
+        {0xFF2A760414536EFB, 0x9C69A97284B578D7},  // 1e150
+        {0xFEF5138519684ABA, 0xC38413CF25E2D70D},  // 1e151
+        {0x7EB258665FC25D69, 0xF46518C2EF5B8CD1},  // 1e152
+        {0xEF2F773FFBD97A61, 0x98BF2F79D5993802},  // 1e153
+        {0xAAFB550FFACFD8FA, 0xBEEEFB584AFF8603},  // 1e154
+        {0x95BA2A53F983CF38, 0xEEAABA2E5DBF6784},  // 1e155
+        {0xDD945A747BF26183, 0x952AB45CFA97A0B2},  // 1e156
+        {0x94F971119AEEF9E4, 0xBA756174393D88DF},  // 1e157
+        {0x7A37CD5601AAB85D, 0xE912B9D1478CEB17},  // 1e158
+        {0xAC62E055C10AB33A, 0x91ABB422CCB812EE},  // 1e159
+        {0x577B986B314D6009, 0xB616A12B7FE617AA},  // 1e160
+        {0xED5A7E85FDA0B80B, 0xE39C49765FDF9D94},  // 1e161
+        {0x14588F13BE847307, 0x8E41ADE9FBEBC27D},  // 1e162
+        {0x596EB2D8AE258FC8, 0xB1D219647AE6B31C},  // 1e163
+        {0x6FCA5F8ED9AEF3BB, 0xDE469FBD99A05FE3},  // 1e164
+        {0x25DE7BB9480D5854, 0x8AEC23D680043BEE},  // 1e165
+        {0xAF561AA79A10AE6A, 0xADA72CCC20054AE9},  // 1e166
+        {0x1B2BA1518094DA04, 0xD910F7FF28069DA4},  // 1e167
+        {0x90FB44D2F05D0842, 0x87AA9AFF79042286},  // 1e168
+        {0x353A1607AC744A53, 0xA99541BF57452B28},  // 1e169
+        {0x42889B8997915CE8, 0xD3FA922F2D1675F2},  // 1e170
+        {0x69956135FEBADA11, 0x847C9B5D7C2E09B7},  // 1e171
+        {0x43FAB9837E699095, 0xA59BC234DB398C25},  // 1e172
+        {0x94F967E45E03F4BB, 0xCF02B2C21207EF2E},  // 1e173
+        {0x1D1BE0EEBAC278F5, 0x8161AFB94B44F57D},  // 1e174
+        {0x6462D92A69731732, 0xA1BA1BA79E1632DC},  // 1e175
+        {0x7D7B8F7503CFDCFE, 0xCA28A291859BBF93},  // 1e176
+        {0x5CDA735244C3D43E, 0xFCB2CB35E702AF78},  // 1e177
+        {0x3A0888136AFA64A7, 0x9DEFBF01B061ADAB},  // 1e178
+        {0x088AAA1845B8FDD0, 0xC56BAEC21C7A1916},  // 1e179
+        {0x8AAD549E57273D45, 0xF6C69A72A3989F5B},  // 1e180
+        {0x36AC54E2F678864B, 0x9A3C2087A63F6399},  // 1e181
+        {0x84576A1BB416A7DD, 0xC0CB28A98FCF3C7F},  // 1e182
+        {0x656D44A2A11C51D5, 0xF0FDF2D3F3C30B9F},  // 1e183
+        {0x9F644AE5A4B1B325, 0x969EB7C47859E743},  // 1e184
+        {0x873D5D9F0DDE1FEE, 0xBC4665B596706114},  // 1e185
+        {0xA90CB506D155A7EA, 0xEB57FF22FC0C7959},  // 1e186
+        {0x09A7F12442D588F2, 0x9316FF75DD87CBD8},  // 1e187
+        {0x0C11ED6D538AEB2F, 0xB7DCBF5354E9BECE},  // 1e188
+        {0x8F1668C8A86DA5FA, 0xE5D3EF282A242E81},  // 1e189
+        {0xF96E017D694487BC, 0x8FA475791A569D10},  // 1e190
+        {0x37C981DCC395A9AC, 0xB38D92D760EC4455},  // 1e191
+        {0x85BBE253F47B1417, 0xE070F78D3927556A},  // 1e192
+        {0x93956D7478CCEC8E, 0x8C469AB843B89562},  // 1e193
+        {0x387AC8D1970027B2, 0xAF58416654A6BABB},  // 1e194
+        {0x06997B05FCC0319E, 0xDB2E51BFE9D0696A},  // 1e195
+        {0x441FECE3BDF81F03, 0x88FCF317F22241E2},  // 1e196
+        {0xD527E81CAD7626C3, 0xAB3C2FDDEEAAD25A},  // 1e197
+        {0x8A71E223D8D3B074, 0xD60B3BD56A5586F1},  // 1e198
+        {0xF6872D5667844E49, 0x85C7056562757456},  // 1e199
+        {0xB428F8AC016561DB, 0xA738C6BEBB12D16C},  // 1e200
+        {0xE13336D701BEBA52, 0xD106F86E69D785C7},  // 1e201
+        {0xECC0024661173473, 0x82A45B450226B39C},  // 1e202
+        {0x27F002D7F95D0190, 0xA34D721642B06084},  // 1e203
+        {0x31EC038DF7B441F4, 0xCC20CE9BD35C78A5},  // 1e204
+        {0x7E67047175A15271, 0xFF290242C83396CE},  // 1e205
+        {0x0F0062C6E984D386, 0x9F79A169BD203E41},  // 1e206
+        {0x52C07B78A3E60868, 0xC75809C42C684DD1},  // 1e207
+        {0xA7709A56CCDF8A82, 0xF92E0C3537826145},  // 1e208
+        {0x88A66076400BB691, 0x9BBCC7A142B17CCB},  // 1e209
+        {0x6ACFF893D00EA435, 0xC2ABF989935DDBFE},  // 1e210
+        {0x0583F6B8C4124D43, 0xF356F7EBF83552FE},  // 1e211
+        {0xC3727A337A8B704A, 0x98165AF37B2153DE},  // 1e212
+        {0x744F18C0592E4C5C, 0xBE1BF1B059E9A8D6},  // 1e213
+        {0x1162DEF06F79DF73, 0xEDA2EE1C7064130C},  // 1e214
+        {0x8ADDCB5645AC2BA8, 0x9485D4D1C63E8BE7},  // 1e215
+        {0x6D953E2BD7173692, 0xB9A74A0637CE2EE1},  // 1e216
+        {0xC8FA8DB6CCDD0437, 0xE8111C87C5C1BA99},  // 1e217
+        {0x1D9C9892400A22A2, 0x910AB1D4DB9914A0},  // 1e218
+        {0x2503BEB6D00CAB4B, 0xB54D5E4A127F59C8},  // 1e219
+        {0x2E44AE64840FD61D, 0xE2A0B5DC971F303A},  // 1e220
+        {0x5CEAECFED289E5D2, 0x8DA471A9DE737E24},  // 1e221
+        {0x7425A83E872C5F47, 0xB10D8E1456105DAD},  // 1e222
+        {0xD12F124E28F77719, 0xDD50F1996B947518},  // 1e223
+        {0x82BD6B70D99AAA6F, 0x8A5296FFE33CC92F},  // 1e224
+        {0x636CC64D1001550B, 0xACE73CBFDC0BFB7B},  // 1e225
+        {0x3C47F7E05401AA4E, 0xD8210BEFD30EFA5A},  // 1e226
+        {0x65ACFAEC34810A71, 0x8714A775E3E95C78},  // 1e227
+        {0x7F1839A741A14D0D, 0xA8D9D1535CE3B396},  // 1e228
+        {0x1EDE48111209A050, 0xD31045A8341CA07C},  // 1e229
+        {0x934AED0AAB460432, 0x83EA2B892091E44D},  // 1e230
+        {0xF81DA84D5617853F, 0xA4E4B66B68B65D60},  // 1e231
+        {0x36251260AB9D668E, 0xCE1DE40642E3F4B9},  // 1e232
+        {0xC1D72B7C6B426019, 0x80D2AE83E9CE78F3},  // 1e233
+        {0xB24CF65B8612F81F, 0xA1075A24E4421730},  // 1e234
+        {0xDEE033F26797B627, 0xC94930AE1D529CFC},  // 1e235
+        {0x169840EF017DA3B1, 0xFB9B7CD9A4A7443C},  // 1e236
+        {0x8E1F289560EE864E, 0x9D412E0806E88AA5},  // 1e237
+        {0xF1A6F2BAB92A27E2, 0xC491798A08A2AD4E},  // 1e238
+        {0xAE10AF696774B1DB, 0xF5B5D7EC8ACB58A2},  // 1e239
+        {0xACCA6DA1E0A8EF29, 0x9991A6F3D6BF1765},  // 1e240
+        {0x17FD090A58D32AF3, 0xBFF610B0CC6EDD3F},  // 1e241
+        {0xDDFC4B4CEF07F5B0, 0xEFF394DCFF8A948E},  // 1e242
+        {0x4ABDAF101564F98E, 0x95F83D0A1FB69CD9},  // 1e243
+        {0x9D6D1AD41ABE37F1, 0xBB764C4CA7A4440F},  // 1e244
+        {0x84C86189216DC5ED, 0xEA53DF5FD18D5513},  // 1e245
+        {0x32FD3CF5B4E49BB4, 0x92746B9BE2F8552C},  // 1e246
+        {0x3FBC8C33221DC2A1, 0xB7118682DBB66A77},  // 1e247
+        {0x0FABAF3FEAA5334A, 0xE4D5E82392A40515},  // 1e248
+        {0x29CB4D87F2A7400E, 0x8F05B1163BA6832D},  // 1e249
+        {0x743E20E9EF511012, 0xB2C71D5BCA9023F8},  // 1e250
+        {0x914DA9246B255416, 0xDF78E4B2BD342CF6},  // 1e251
+        {0x1AD089B6C2F7548E, 0x8BAB8EEFB6409C1A},  // 1e252
+        {0xA184AC2473B529B1, 0xAE9672ABA3D0C320},  // 1e253
+        {0xC9E5D72D90A2741E, 0xDA3C0F568CC4F3E8},  // 1e254
+        {0x7E2FA67C7A658892, 0x8865899617FB1871},  // 1e255
+        {0xDDBB901B98FEEAB7, 0xAA7EEBFB9DF9DE8D},  // 1e256
+        {0x552A74227F3EA565, 0xD51EA6FA85785631},  // 1e257
+        {0xD53A88958F87275F, 0x8533285C936B35DE},  // 1e258
+        {0x8A892ABAF368F137, 0xA67FF273B8460356},  // 1e259
+        {0x2D2B7569B0432D85, 0xD01FEF10A657842C},  // 1e260
+        {0x9C3B29620E29FC73, 0x8213F56A67F6B29B},  // 1e261
+        {0x8349F3BA91B47B8F, 0xA298F2C501F45F42},  // 1e262
+        {0x241C70A936219A73, 0xCB3F2F7642717713},  // 1e263
+        {0xED238CD383AA0110, 0xFE0EFB53D30DD4D7},  // 1e264
+        {0xF4363804324A40AA, 0x9EC95D1463E8A506},  // 1e265
+        {0xB143C6053EDCD0D5, 0xC67BB4597CE2CE48},  // 1e266
+        {0xDD94B7868E94050A, 0xF81AA16FDC1B81DA},  // 1e267
+        {0xCA7CF2B4191C8326, 0x9B10A4E5E9913128},  // 1e268
+        {0xFD1C2F611F63A3F0, 0xC1D4CE1F63F57D72},  // 1e269
+        {0xBC633B39673C8CEC, 0xF24A01A73CF2DCCF},  // 1e270
+        {0xD5BE0503E085D813, 0x976E41088617CA01},  // 1e271
+        {0x4B2D8644D8A74E18, 0xBD49D14AA79DBC82},  // 1e272
+        {0xDDF8E7D60ED1219E, 0xEC9C459D51852BA2},  // 1e273
+        {0xCABB90E5C942B503, 0x93E1AB8252F33B45},  // 1e274
+        {0x3D6A751F3B936243, 0xB8DA1662E7B00A17},  // 1e275
+        {0x0CC512670A783AD4, 0xE7109BFBA19C0C9D},  // 1e276
+        {0x27FB2B80668B24C5, 0x906A617D450187E2},  // 1e277
+        {0xB1F9F660802DEDF6, 0xB484F9DC9641E9DA},  // 1e278
+        {0x5E7873F8A0396973, 0xE1A63853BBD26451},  // 1e279
+        {0xDB0B487B6423E1E8, 0x8D07E33455637EB2},  // 1e280
+        {0x91CE1A9A3D2CDA62, 0xB049DC016ABC5E5F},  // 1e281
+        {0x7641A140CC7810FB, 0xDC5C5301C56B75F7},  // 1e282
+        {0xA9E904C87FCB0A9D, 0x89B9B3E11B6329BA},  // 1e283
+        {0x546345FA9FBDCD44, 0xAC2820D9623BF429},  // 1e284
+        {0xA97C177947AD4095, 0xD732290FBACAF133},  // 1e285
+        {0x49ED8EABCCCC485D, 0x867F59A9D4BED6C0},  // 1e286
+        {0x5C68F256BFFF5A74, 0xA81F301449EE8C70},  // 1e287
+        {0x73832EEC6FFF3111, 0xD226FC195C6A2F8C},  // 1e288
+};
+
+// wuffs_base__private_implementation__f64_powers_of_10 holds powers of 10 that
+// can be exactly represented by a float64 (what C calls a double).
+static const double wuffs_base__private_implementation__f64_powers_of_10[23] = {
+    1e0,  1e1,  1e2,  1e3,  1e4,  1e5,  1e6,  1e7,  1e8,  1e9,  1e10, 1e11,
+    1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22,
+};
+
+// ---------------- IEEE 754 Floating Point
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__lossy_value_u16  //
+wuffs_base__ieee_754_bit_representation__from_f64_to_u16_truncate(double f) {
+  uint64_t u = 0;
+  if (sizeof(uint64_t) == sizeof(double)) {
+    memcpy(&u, &f, sizeof(uint64_t));
+  }
+  uint16_t neg = ((uint16_t)((u >> 63) << 15));
+  u &= 0x7FFFFFFFFFFFFFFF;
+  uint64_t exp = u >> 52;
+  uint64_t man = u & 0x000FFFFFFFFFFFFF;
+
+  if (exp == 0x7FF) {
+    if (man == 0) {  // Infinity.
+      wuffs_base__lossy_value_u16 ret;
+      ret.value = neg | 0x7C00;
+      ret.lossy = false;
+      return ret;
+    }
+    // NaN. Shift the 52 mantissa bits to 10 mantissa bits, keeping the most
+    // significant mantissa bit (quiet vs signaling NaNs). Also set the low 9
+    // bits of ret.value so that the 10-bit mantissa is non-zero.
+    wuffs_base__lossy_value_u16 ret;
+    ret.value = neg | 0x7DFF | ((uint16_t)(man >> 42));
+    ret.lossy = false;
+    return ret;
+
+  } else if (exp > 0x40E) {  // Truncate to the largest finite f16.
+    wuffs_base__lossy_value_u16 ret;
+    ret.value = neg | 0x7BFF;
+    ret.lossy = true;
+    return ret;
+
+  } else if (exp <= 0x3E6) {  // Truncate to zero.
+    wuffs_base__lossy_value_u16 ret;
+    ret.value = neg;
+    ret.lossy = (u != 0);
+    return ret;
+
+  } else if (exp <= 0x3F0) {  // Normal f64, subnormal f16.
+    // Convert from a 53-bit mantissa (after realizing the implicit bit) to a
+    // 10-bit mantissa and then adjust for the exponent.
+    man |= 0x0010000000000000;
+    uint32_t shift = ((uint32_t)(1051 - exp));  // 1051 = 0x3F0 + 53 - 10.
+    uint64_t shifted_man = man >> shift;
+    wuffs_base__lossy_value_u16 ret;
+    ret.value = neg | ((uint16_t)shifted_man);
+    ret.lossy = (shifted_man << shift) != man;
+    return ret;
+  }
+
+  // Normal f64, normal f16.
+
+  // Re-bias from 1023 to 15 and shift above f16's 10 mantissa bits.
+  exp = (exp - 1008) << 10;  // 1008 = 1023 - 15 = 0x3FF - 0xF.
+
+  // Convert from a 52-bit mantissa (excluding the implicit bit) to a 10-bit
+  // mantissa (again excluding the implicit bit). We lose some information if
+  // any of the bottom 42 bits are non-zero.
+  wuffs_base__lossy_value_u16 ret;
+  ret.value = neg | ((uint16_t)exp) | ((uint16_t)(man >> 42));
+  ret.lossy = (man << 22) != 0;
+  return ret;
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__lossy_value_u32  //
+wuffs_base__ieee_754_bit_representation__from_f64_to_u32_truncate(double f) {
+  uint64_t u = 0;
+  if (sizeof(uint64_t) == sizeof(double)) {
+    memcpy(&u, &f, sizeof(uint64_t));
+  }
+  uint32_t neg = ((uint32_t)(u >> 63)) << 31;
+  u &= 0x7FFFFFFFFFFFFFFF;
+  uint64_t exp = u >> 52;
+  uint64_t man = u & 0x000FFFFFFFFFFFFF;
+
+  if (exp == 0x7FF) {
+    if (man == 0) {  // Infinity.
+      wuffs_base__lossy_value_u32 ret;
+      ret.value = neg | 0x7F800000;
+      ret.lossy = false;
+      return ret;
+    }
+    // NaN. Shift the 52 mantissa bits to 23 mantissa bits, keeping the most
+    // significant mantissa bit (quiet vs signaling NaNs). Also set the low 22
+    // bits of ret.value so that the 23-bit mantissa is non-zero.
+    wuffs_base__lossy_value_u32 ret;
+    ret.value = neg | 0x7FBFFFFF | ((uint32_t)(man >> 29));
+    ret.lossy = false;
+    return ret;
+
+  } else if (exp > 0x47E) {  // Truncate to the largest finite f32.
+    wuffs_base__lossy_value_u32 ret;
+    ret.value = neg | 0x7F7FFFFF;
+    ret.lossy = true;
+    return ret;
+
+  } else if (exp <= 0x369) {  // Truncate to zero.
+    wuffs_base__lossy_value_u32 ret;
+    ret.value = neg;
+    ret.lossy = (u != 0);
+    return ret;
+
+  } else if (exp <= 0x380) {  // Normal f64, subnormal f32.
+    // Convert from a 53-bit mantissa (after realizing the implicit bit) to a
+    // 23-bit mantissa and then adjust for the exponent.
+    man |= 0x0010000000000000;
+    uint32_t shift = ((uint32_t)(926 - exp));  // 926 = 0x380 + 53 - 23.
+    uint64_t shifted_man = man >> shift;
+    wuffs_base__lossy_value_u32 ret;
+    ret.value = neg | ((uint32_t)shifted_man);
+    ret.lossy = (shifted_man << shift) != man;
+    return ret;
+  }
+
+  // Normal f64, normal f32.
+
+  // Re-bias from 1023 to 127 and shift above f32's 23 mantissa bits.
+  exp = (exp - 896) << 23;  // 896 = 1023 - 127 = 0x3FF - 0x7F.
+
+  // Convert from a 52-bit mantissa (excluding the implicit bit) to a 23-bit
+  // mantissa (again excluding the implicit bit). We lose some information if
+  // any of the bottom 29 bits are non-zero.
+  wuffs_base__lossy_value_u32 ret;
+  ret.value = neg | ((uint32_t)exp) | ((uint32_t)(man >> 29));
+  ret.lossy = (man << 35) != 0;
+  return ret;
+}
+
+// --------
+
+#define WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE 2047
+#define WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION 800
+
+// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL is the largest N
+// such that ((10 << N) < (1 << 64)).
+#define WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL 60
+
+// wuffs_base__private_implementation__high_prec_dec (abbreviated as HPD) is a
+// fixed precision floating point decimal number, augmented with ±infinity
+// values, but it cannot represent NaN (Not a Number).
+//
+// "High precision" means that the mantissa holds 800 decimal digits. 800 is
+// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION.
+//
+// An HPD isn't for general purpose arithmetic, only for conversions to and
+// from IEEE 754 double-precision floating point, where the largest and
+// smallest positive, finite values are approximately 1.8e+308 and 4.9e-324.
+// HPD exponents above +2047 mean infinity, below -2047 mean zero. The ±2047
+// bounds are further away from zero than ±(324 + 800), where 800 and 2047 is
+// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION and
+// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE.
+//
+// digits[.. num_digits] are the number's digits in big-endian order. The
+// uint8_t values are in the range [0 ..= 9], not ['0' ..= '9'], where e.g. '7'
+// is the ASCII value 0x37.
+//
+// decimal_point is the index (within digits) of the decimal point. It may be
+// negative or be larger than num_digits, in which case the explicit digits are
+// padded with implicit zeroes.
+//
+// For example, if num_digits is 3 and digits is "\x07\x08\x09":
+//  - A decimal_point of -2 means ".00789"
+//  - A decimal_point of -1 means ".0789"
+//  - A decimal_point of +0 means ".789"
+//  - A decimal_point of +1 means "7.89"
+//  - A decimal_point of +2 means "78.9"
+//  - A decimal_point of +3 means "789."
+//  - A decimal_point of +4 means "7890."
+//  - A decimal_point of +5 means "78900."
+//
+// As above, a decimal_point higher than +2047 means that the overall value is
+// infinity, lower than -2047 means zero.
+//
+// negative is a sign bit. An HPD can distinguish positive and negative zero.
+//
+// truncated is whether there are more than
+// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION digits, and at
+// least one of those extra digits are non-zero. The existence of long-tail
+// digits can affect rounding.
+//
+// The "all fields are zero" value is valid, and represents the number +0.
+typedef struct wuffs_base__private_implementation__high_prec_dec__struct {
+  uint32_t num_digits;
+  int32_t decimal_point;
+  bool negative;
+  bool truncated;
+  uint8_t digits[WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION];
+} wuffs_base__private_implementation__high_prec_dec;
+
+// wuffs_base__private_implementation__high_prec_dec__trim trims trailing
+// zeroes from the h->digits[.. h->num_digits] slice. They have no benefit,
+// since we explicitly track h->decimal_point.
+//
+// Preconditions:
+//  - h is non-NULL.
+static inline void  //
+wuffs_base__private_implementation__high_prec_dec__trim(
+    wuffs_base__private_implementation__high_prec_dec* h) {
+  while ((h->num_digits > 0) && (h->digits[h->num_digits - 1] == 0)) {
+    h->num_digits--;
+  }
+}
+
+// wuffs_base__private_implementation__high_prec_dec__assign sets h to
+// represent the number x.
+//
+// Preconditions:
+//  - h is non-NULL.
+static void  //
+wuffs_base__private_implementation__high_prec_dec__assign(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    uint64_t x,
+    bool negative) {
+  uint32_t n = 0;
+
+  // Set h->digits.
+  if (x > 0) {
+    // Calculate the digits, working right-to-left. After we determine n (how
+    // many digits there are), copy from buf to h->digits.
+    //
+    // UINT64_MAX, 18446744073709551615, is 20 digits long. It can be faster to
+    // copy a constant number of bytes than a variable number (20 instead of
+    // n). Make buf large enough (and start writing to it from the middle) so
+    // that can we always copy 20 bytes: the slice buf[(20-n) .. (40-n)].
+    uint8_t buf[40] = {0};
+    uint8_t* ptr = &buf[20];
+    do {
+      uint64_t remaining = x / 10;
+      x -= remaining * 10;
+      ptr--;
+      *ptr = (uint8_t)x;
+      n++;
+      x = remaining;
+    } while (x > 0);
+    memcpy(h->digits, ptr, 20);
+  }
+
+  // Set h's other fields.
+  h->num_digits = n;
+  h->decimal_point = (int32_t)n;
+  h->negative = negative;
+  h->truncated = false;
+  wuffs_base__private_implementation__high_prec_dec__trim(h);
+}
+
+static wuffs_base__status  //
+wuffs_base__private_implementation__high_prec_dec__parse(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    wuffs_base__slice_u8 s,
+    uint32_t options) {
+  if (!h) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  h->num_digits = 0;
+  h->decimal_point = 0;
+  h->negative = false;
+  h->truncated = false;
+
+  uint8_t* p = s.ptr;
+  uint8_t* q = s.ptr + s.len;
+
+  if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
+    for (;; p++) {
+      if (p >= q) {
+        return wuffs_base__make_status(wuffs_base__error__bad_argument);
+      } else if (*p != '_') {
+        break;
+      }
+    }
+  }
+
+  // Parse sign.
+  do {
+    if (*p == '+') {
+      p++;
+    } else if (*p == '-') {
+      h->negative = true;
+      p++;
+    } else {
+      break;
+    }
+    if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
+      for (;; p++) {
+        if (p >= q) {
+          return wuffs_base__make_status(wuffs_base__error__bad_argument);
+        } else if (*p != '_') {
+          break;
+        }
+      }
+    }
+  } while (0);
+
+  // Parse digits, up to (and including) a '.', 'E' or 'e'. Examples for each
+  // limb in this if-else chain:
+  //  - "0.789"
+  //  - "1002.789"
+  //  - ".789"
+  //  - Other (invalid input).
+  uint32_t nd = 0;
+  int32_t dp = 0;
+  bool no_digits_before_separator = false;
+  if (('0' == *p) &&
+      !(options &
+        WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_MULTIPLE_LEADING_ZEROES)) {
+    p++;
+    for (;; p++) {
+      if (p >= q) {
+        goto after_all;
+      } else if (*p ==
+                 ((options &
+                   WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
+                      ? ','
+                      : '.')) {
+        p++;
+        goto after_sep;
+      } else if ((*p == 'E') || (*p == 'e')) {
+        p++;
+        goto after_exp;
+      } else if ((*p != '_') ||
+                 !(options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
+        return wuffs_base__make_status(wuffs_base__error__bad_argument);
+      }
+    }
+
+  } else if (('0' <= *p) && (*p <= '9')) {
+    if (*p == '0') {
+      for (; (p < q) && (*p == '0'); p++) {
+      }
+    } else {
+      h->digits[nd++] = (uint8_t)(*p - '0');
+      dp = (int32_t)nd;
+      p++;
+    }
+
+    for (;; p++) {
+      if (p >= q) {
+        goto after_all;
+      } else if (('0' <= *p) && (*p <= '9')) {
+        if (nd < WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
+          h->digits[nd++] = (uint8_t)(*p - '0');
+          dp = (int32_t)nd;
+        } else if ('0' != *p) {
+          // Long-tail non-zeroes set the truncated bit.
+          h->truncated = true;
+        }
+      } else if (*p ==
+                 ((options &
+                   WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
+                      ? ','
+                      : '.')) {
+        p++;
+        goto after_sep;
+      } else if ((*p == 'E') || (*p == 'e')) {
+        p++;
+        goto after_exp;
+      } else if ((*p != '_') ||
+                 !(options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
+        return wuffs_base__make_status(wuffs_base__error__bad_argument);
+      }
+    }
+
+  } else if (*p == ((options &
+                     WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
+                        ? ','
+                        : '.')) {
+    p++;
+    no_digits_before_separator = true;
+
+  } else {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+
+after_sep:
+  for (;; p++) {
+    if (p >= q) {
+      goto after_all;
+    } else if ('0' == *p) {
+      if (nd == 0) {
+        // Track leading zeroes implicitly.
+        dp--;
+      } else if (nd <
+                 WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
+        h->digits[nd++] = (uint8_t)(*p - '0');
+      }
+    } else if (('0' < *p) && (*p <= '9')) {
+      if (nd < WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
+        h->digits[nd++] = (uint8_t)(*p - '0');
+      } else {
+        // Long-tail non-zeroes set the truncated bit.
+        h->truncated = true;
+      }
+    } else if ((*p == 'E') || (*p == 'e')) {
+      p++;
+      goto after_exp;
+    } else if ((*p != '_') ||
+               !(options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
+      return wuffs_base__make_status(wuffs_base__error__bad_argument);
+    }
+  }
+
+after_exp:
+  do {
+    if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
+      for (;; p++) {
+        if (p >= q) {
+          return wuffs_base__make_status(wuffs_base__error__bad_argument);
+        } else if (*p != '_') {
+          break;
+        }
+      }
+    }
+
+    int32_t exp_sign = +1;
+    if (*p == '+') {
+      p++;
+    } else if (*p == '-') {
+      exp_sign = -1;
+      p++;
+    }
+
+    int32_t exp = 0;
+    const int32_t exp_large =
+        WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE +
+        WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION;
+    bool saw_exp_digits = false;
+    for (; p < q; p++) {
+      if ((*p == '_') &&
+          (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
+        // No-op.
+      } else if (('0' <= *p) && (*p <= '9')) {
+        saw_exp_digits = true;
+        if (exp < exp_large) {
+          exp = (10 * exp) + ((int32_t)(*p - '0'));
+        }
+      } else {
+        break;
+      }
+    }
+    if (!saw_exp_digits) {
+      return wuffs_base__make_status(wuffs_base__error__bad_argument);
+    }
+    dp += exp_sign * exp;
+  } while (0);
+
+after_all:
+  if (p != q) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  h->num_digits = nd;
+  if (nd == 0) {
+    if (no_digits_before_separator) {
+      return wuffs_base__make_status(wuffs_base__error__bad_argument);
+    }
+    h->decimal_point = 0;
+  } else if (dp <
+             -WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE) {
+    h->decimal_point =
+        -WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE - 1;
+  } else if (dp >
+             +WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE) {
+    h->decimal_point =
+        +WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE + 1;
+  } else {
+    h->decimal_point = dp;
+  }
+  wuffs_base__private_implementation__high_prec_dec__trim(h);
+  return wuffs_base__make_status(NULL);
+}
+
+// --------
+
+// wuffs_base__private_implementation__high_prec_dec__lshift_num_new_digits
+// returns the number of additional decimal digits when left-shifting by shift.
+//
+// See below for preconditions.
+static uint32_t  //
+wuffs_base__private_implementation__high_prec_dec__lshift_num_new_digits(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    uint32_t shift) {
+  // Masking with 0x3F should be unnecessary (assuming the preconditions) but
+  // it's cheap and ensures that we don't overflow the
+  // wuffs_base__private_implementation__hpd_left_shift array.
+  shift &= 63;
+
+  uint32_t x_a = wuffs_base__private_implementation__hpd_left_shift[shift];
+  uint32_t x_b = wuffs_base__private_implementation__hpd_left_shift[shift + 1];
+  uint32_t num_new_digits = x_a >> 11;
+  uint32_t pow5_a = 0x7FF & x_a;
+  uint32_t pow5_b = 0x7FF & x_b;
+
+  const uint8_t* pow5 =
+      &wuffs_base__private_implementation__powers_of_5[pow5_a];
+  uint32_t i = 0;
+  uint32_t n = pow5_b - pow5_a;
+  for (; i < n; i++) {
+    if (i >= h->num_digits) {
+      return num_new_digits - 1;
+    } else if (h->digits[i] == pow5[i]) {
+      continue;
+    } else if (h->digits[i] < pow5[i]) {
+      return num_new_digits - 1;
+    } else {
+      return num_new_digits;
+    }
+  }
+  return num_new_digits;
+}
+
+// --------
+
+// wuffs_base__private_implementation__high_prec_dec__rounded_integer returns
+// the integral (non-fractional) part of h, provided that it is 18 or fewer
+// decimal digits. For 19 or more digits, it returns UINT64_MAX. Note that:
+//  - (1 << 53) is    9007199254740992, which has 16 decimal digits.
+//  - (1 << 56) is   72057594037927936, which has 17 decimal digits.
+//  - (1 << 59) is  576460752303423488, which has 18 decimal digits.
+//  - (1 << 63) is 9223372036854775808, which has 19 decimal digits.
+// and that IEEE 754 double precision has 52 mantissa bits.
+//
+// That integral part is rounded-to-even: rounding 7.5 or 8.5 both give 8.
+//
+// h's negative bit is ignored: rounding -8.6 returns 9.
+//
+// See below for preconditions.
+static uint64_t  //
+wuffs_base__private_implementation__high_prec_dec__rounded_integer(
+    wuffs_base__private_implementation__high_prec_dec* h) {
+  if ((h->num_digits == 0) || (h->decimal_point < 0)) {
+    return 0;
+  } else if (h->decimal_point > 18) {
+    return UINT64_MAX;
+  }
+
+  uint32_t dp = (uint32_t)(h->decimal_point);
+  uint64_t n = 0;
+  uint32_t i = 0;
+  for (; i < dp; i++) {
+    n = (10 * n) + ((i < h->num_digits) ? h->digits[i] : 0);
+  }
+
+  bool round_up = false;
+  if (dp < h->num_digits) {
+    round_up = h->digits[dp] >= 5;
+    if ((h->digits[dp] == 5) && (dp + 1 == h->num_digits)) {
+      // We are exactly halfway. If we're truncated, round up, otherwise round
+      // to even.
+      round_up = h->truncated ||  //
+                 ((dp > 0) && (1 & h->digits[dp - 1]));
+    }
+  }
+  if (round_up) {
+    n++;
+  }
+
+  return n;
+}
+
+// wuffs_base__private_implementation__high_prec_dec__small_xshift shifts h's
+// number (where 'x' is 'l' or 'r' for left or right) by a small shift value.
+//
+// Preconditions:
+//  - h is non-NULL.
+//  - h->decimal_point is "not extreme".
+//  - shift is non-zero.
+//  - shift is "a small shift".
+//
+// "Not extreme" means within
+// ±WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE.
+//
+// "A small shift" means not more than
+// WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL.
+//
+// wuffs_base__private_implementation__high_prec_dec__rounded_integer and
+// wuffs_base__private_implementation__high_prec_dec__lshift_num_new_digits
+// have the same preconditions.
+//
+// wuffs_base__private_implementation__high_prec_dec__lshift keeps the first
+// two preconditions but not the last two. Its shift argument is signed and
+// does not need to be "small": zero is a no-op, positive means left shift and
+// negative means right shift.
+
+static void  //
+wuffs_base__private_implementation__high_prec_dec__small_lshift(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    uint32_t shift) {
+  if (h->num_digits == 0) {
+    return;
+  }
+  uint32_t num_new_digits =
+      wuffs_base__private_implementation__high_prec_dec__lshift_num_new_digits(
+          h, shift);
+  uint32_t rx = h->num_digits - 1;                   // Read  index.
+  uint32_t wx = h->num_digits - 1 + num_new_digits;  // Write index.
+  uint64_t n = 0;
+
+  // Repeat: pick up a digit, put down a digit, right to left.
+  while (((int32_t)rx) >= 0) {
+    n += ((uint64_t)(h->digits[rx])) << shift;
+    uint64_t quo = n / 10;
+    uint64_t rem = n - (10 * quo);
+    if (wx < WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
+      h->digits[wx] = (uint8_t)rem;
+    } else if (rem > 0) {
+      h->truncated = true;
+    }
+    n = quo;
+    wx--;
+    rx--;
+  }
+
+  // Put down leading digits, right to left.
+  while (n > 0) {
+    uint64_t quo = n / 10;
+    uint64_t rem = n - (10 * quo);
+    if (wx < WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
+      h->digits[wx] = (uint8_t)rem;
+    } else if (rem > 0) {
+      h->truncated = true;
+    }
+    n = quo;
+    wx--;
+  }
+
+  // Finish.
+  h->num_digits += num_new_digits;
+  if (h->num_digits >
+      WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
+    h->num_digits = WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION;
+  }
+  h->decimal_point += (int32_t)num_new_digits;
+  wuffs_base__private_implementation__high_prec_dec__trim(h);
+}
+
+static void  //
+wuffs_base__private_implementation__high_prec_dec__small_rshift(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    uint32_t shift) {
+  uint32_t rx = 0;  // Read  index.
+  uint32_t wx = 0;  // Write index.
+  uint64_t n = 0;
+
+  // Pick up enough leading digits to cover the first shift.
+  while ((n >> shift) == 0) {
+    if (rx < h->num_digits) {
+      // Read a digit.
+      n = (10 * n) + h->digits[rx++];
+    } else if (n == 0) {
+      // h's number used to be zero and remains zero.
+      return;
+    } else {
+      // Read sufficient implicit trailing zeroes.
+      while ((n >> shift) == 0) {
+        n = 10 * n;
+        rx++;
+      }
+      break;
+    }
+  }
+  h->decimal_point -= ((int32_t)(rx - 1));
+  if (h->decimal_point <
+      -WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE) {
+    // After the shift, h's number is effectively zero.
+    h->num_digits = 0;
+    h->decimal_point = 0;
+    h->truncated = false;
+    return;
+  }
+
+  // Repeat: pick up a digit, put down a digit, left to right.
+  uint64_t mask = (((uint64_t)(1)) << shift) - 1;
+  while (rx < h->num_digits) {
+    uint8_t new_digit = ((uint8_t)(n >> shift));
+    n = (10 * (n & mask)) + h->digits[rx++];
+    h->digits[wx++] = new_digit;
+  }
+
+  // Put down trailing digits, left to right.
+  while (n > 0) {
+    uint8_t new_digit = ((uint8_t)(n >> shift));
+    n = 10 * (n & mask);
+    if (wx < WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DIGITS_PRECISION) {
+      h->digits[wx++] = new_digit;
+    } else if (new_digit > 0) {
+      h->truncated = true;
+    }
+  }
+
+  // Finish.
+  h->num_digits = wx;
+  wuffs_base__private_implementation__high_prec_dec__trim(h);
+}
+
+static void  //
+wuffs_base__private_implementation__high_prec_dec__lshift(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    int32_t shift) {
+  if (shift > 0) {
+    while (shift > +WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL) {
+      wuffs_base__private_implementation__high_prec_dec__small_lshift(
+          h, WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL);
+      shift -= WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL;
+    }
+    wuffs_base__private_implementation__high_prec_dec__small_lshift(
+        h, ((uint32_t)(+shift)));
+  } else if (shift < 0) {
+    while (shift < -WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL) {
+      wuffs_base__private_implementation__high_prec_dec__small_rshift(
+          h, WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL);
+      shift += WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL;
+    }
+    wuffs_base__private_implementation__high_prec_dec__small_rshift(
+        h, ((uint32_t)(-shift)));
+  }
+}
+
+// --------
+
+// wuffs_base__private_implementation__high_prec_dec__round_etc rounds h's
+// number. For those functions that take an n argument, rounding produces at
+// most n digits (which is not necessarily at most n decimal places). Negative
+// n values are ignored, as well as any n greater than or equal to h's number
+// of digits. The etc__round_just_enough function implicitly chooses an n to
+// implement WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION.
+//
+// Preconditions:
+//  - h is non-NULL.
+//  - h->decimal_point is "not extreme".
+//
+// "Not extreme" means within
+// ±WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE.
+
+static void  //
+wuffs_base__private_implementation__high_prec_dec__round_down(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    int32_t n) {
+  if ((n < 0) || (h->num_digits <= (uint32_t)n)) {
+    return;
+  }
+  h->num_digits = (uint32_t)(n);
+  wuffs_base__private_implementation__high_prec_dec__trim(h);
+}
+
+static void  //
+wuffs_base__private_implementation__high_prec_dec__round_up(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    int32_t n) {
+  if ((n < 0) || (h->num_digits <= (uint32_t)n)) {
+    return;
+  }
+
+  for (n--; n >= 0; n--) {
+    if (h->digits[n] < 9) {
+      h->digits[n]++;
+      h->num_digits = (uint32_t)(n + 1);
+      return;
+    }
+  }
+
+  // The number is all 9s. Change to a single 1 and adjust the decimal point.
+  h->digits[0] = 1;
+  h->num_digits = 1;
+  h->decimal_point++;
+}
+
+static void  //
+wuffs_base__private_implementation__high_prec_dec__round_nearest(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    int32_t n) {
+  if ((n < 0) || (h->num_digits <= (uint32_t)n)) {
+    return;
+  }
+  bool up = h->digits[n] >= 5;
+  if ((h->digits[n] == 5) && ((n + 1) == ((int32_t)(h->num_digits)))) {
+    up = h->truncated ||  //
+         ((n > 0) && ((h->digits[n - 1] & 1) != 0));
+  }
+
+  if (up) {
+    wuffs_base__private_implementation__high_prec_dec__round_up(h, n);
+  } else {
+    wuffs_base__private_implementation__high_prec_dec__round_down(h, n);
+  }
+}
+
+static void  //
+wuffs_base__private_implementation__high_prec_dec__round_just_enough(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    int32_t exp2,
+    uint64_t mantissa) {
+  // The magic numbers 52 and 53 in this function are because IEEE 754 double
+  // precision has 52 mantissa bits.
+  //
+  // Let f be the floating point number represented by exp2 and mantissa (and
+  // also the number in h): the number (mantissa * (2 ** (exp2 - 52))).
+  //
+  // If f is zero or a small integer, we can return early.
+  if ((mantissa == 0) ||
+      ((exp2 < 53) && (h->decimal_point >= ((int32_t)(h->num_digits))))) {
+    return;
+  }
+
+  // The smallest normal f has an exp2 of -1022 and a mantissa of (1 << 52).
+  // Subnormal numbers have the same exp2 but a smaller mantissa.
+  static const int32_t min_incl_normal_exp2 = -1022;
+  static const uint64_t min_incl_normal_mantissa = 0x0010000000000000ul;
+
+  // Compute lower and upper bounds such that any number between them (possibly
+  // inclusive) will round to f. First, the lower bound. Our number f is:
+  //   ((mantissa + 0)         * (2 ** (  exp2 - 52)))
+  //
+  // The next lowest floating point number is:
+  //   ((mantissa - 1)         * (2 ** (  exp2 - 52)))
+  // unless (mantissa - 1) drops the (1 << 52) bit and exp2 is not the
+  // min_incl_normal_exp2. Either way, call it:
+  //   ((l_mantissa)           * (2 ** (l_exp2 - 52)))
+  //
+  // The lower bound is halfway between them (noting that 52 became 53):
+  //   (((2 * l_mantissa) + 1) * (2 ** (l_exp2 - 53)))
+  int32_t l_exp2 = exp2;
+  uint64_t l_mantissa = mantissa - 1;
+  if ((exp2 > min_incl_normal_exp2) && (mantissa <= min_incl_normal_mantissa)) {
+    l_exp2 = exp2 - 1;
+    l_mantissa = (2 * mantissa) - 1;
+  }
+  wuffs_base__private_implementation__high_prec_dec lower;
+  wuffs_base__private_implementation__high_prec_dec__assign(
+      &lower, (2 * l_mantissa) + 1, false);
+  wuffs_base__private_implementation__high_prec_dec__lshift(&lower,
+                                                            l_exp2 - 53);
+
+  // Next, the upper bound. Our number f is:
+  //   ((mantissa + 0)       * (2 ** (exp2 - 52)))
+  //
+  // The next highest floating point number is:
+  //   ((mantissa + 1)       * (2 ** (exp2 - 52)))
+  //
+  // The upper bound is halfway between them (noting that 52 became 53):
+  //   (((2 * mantissa) + 1) * (2 ** (exp2 - 53)))
+  wuffs_base__private_implementation__high_prec_dec upper;
+  wuffs_base__private_implementation__high_prec_dec__assign(
+      &upper, (2 * mantissa) + 1, false);
+  wuffs_base__private_implementation__high_prec_dec__lshift(&upper, exp2 - 53);
+
+  // The lower and upper bounds are possible outputs only if the original
+  // mantissa is even, so that IEEE round-to-even would round to the original
+  // mantissa and not its neighbors.
+  bool inclusive = (mantissa & 1) == 0;
+
+  // As we walk the digits, we want to know whether rounding up would fall
+  // within the upper bound. This is tracked by upper_delta:
+  //  - When -1, the digits of h and upper are the same so far.
+  //  - When +0, we saw a difference of 1 between h and upper on a previous
+  //    digit and subsequently only 9s for h and 0s for upper. Thus, rounding
+  //    up may fall outside of the bound if !inclusive.
+  //  - When +1, the difference is greater than 1 and we know that rounding up
+  //    falls within the bound.
+  //
+  // This is a state machine with three states. The numerical value for each
+  // state (-1, +0 or +1) isn't important, other than their order.
+  int upper_delta = -1;
+
+  // We can now figure out the shortest number of digits required. Walk the
+  // digits until h has distinguished itself from lower or upper.
+  //
+  // The zi and zd variables are indexes and digits, for z in l (lower), h (the
+  // number) and u (upper).
+  //
+  // The lower, h and upper numbers may have their decimal points at different
+  // places. In this case, upper is the longest, so we iterate ui starting from
+  // 0 and iterate li and hi starting from either 0 or -1.
+  int32_t ui = 0;
+  for (;; ui++) {
+    // Calculate hd, the middle number's digit.
+    int32_t hi = ui - upper.decimal_point + h->decimal_point;
+    if (hi >= ((int32_t)(h->num_digits))) {
+      break;
+    }
+    uint8_t hd = (((uint32_t)hi) < h->num_digits) ? h->digits[hi] : 0;
+
+    // Calculate ld, the lower bound's digit.
+    int32_t li = ui - upper.decimal_point + lower.decimal_point;
+    uint8_t ld = (((uint32_t)li) < lower.num_digits) ? lower.digits[li] : 0;
+
+    // We can round down (truncate) if lower has a different digit than h or if
+    // lower is inclusive and is exactly the result of rounding down (i.e. we
+    // have reached the final digit of lower).
+    bool can_round_down =
+        (ld != hd) ||  //
+        (inclusive && ((li + 1) == ((int32_t)(lower.num_digits))));
+
+    // Calculate ud, the upper bound's digit, and update upper_delta.
+    uint8_t ud = (((uint32_t)ui) < upper.num_digits) ? upper.digits[ui] : 0;
+    if (upper_delta < 0) {
+      if ((hd + 1) < ud) {
+        // For example:
+        // h     = 12345???
+        // upper = 12347???
+        upper_delta = +1;
+      } else if (hd != ud) {
+        // For example:
+        // h     = 12345???
+        // upper = 12346???
+        upper_delta = +0;
+      }
+    } else if (upper_delta == 0) {
+      if ((hd != 9) || (ud != 0)) {
+        // For example:
+        // h     = 1234598?
+        // upper = 1234600?
+        upper_delta = +1;
+      }
+    }
+
+    // We can round up if upper has a different digit than h and either upper
+    // is inclusive or upper is bigger than the result of rounding up.
+    bool can_round_up =
+        (upper_delta > 0) ||    //
+        ((upper_delta == 0) &&  //
+         (inclusive || ((ui + 1) < ((int32_t)(upper.num_digits)))));
+
+    // If we can round either way, round to nearest. If we can round only one
+    // way, do it. If we can't round, continue the loop.
+    if (can_round_down) {
+      if (can_round_up) {
+        wuffs_base__private_implementation__high_prec_dec__round_nearest(
+            h, hi + 1);
+        return;
+      } else {
+        wuffs_base__private_implementation__high_prec_dec__round_down(h,
+                                                                      hi + 1);
+        return;
+      }
+    } else {
+      if (can_round_up) {
+        wuffs_base__private_implementation__high_prec_dec__round_up(h, hi + 1);
+        return;
+      }
+    }
+  }
+}
+
+// --------
+
+// wuffs_base__private_implementation__parse_number_f64_eisel_lemire produces
+// the IEEE 754 double-precision value for an exact mantissa and base-10
+// exponent. For example:
+//  - when parsing "12345.678e+02", man is 12345678 and exp10 is -1.
+//  - when parsing "-12", man is 12 and exp10 is 0. Processing the leading
+//    minus sign is the responsibility of the caller, not this function.
+//
+// On success, it returns a non-negative int64_t such that the low 63 bits hold
+// the 11-bit exponent and 52-bit mantissa.
+//
+// On failure, it returns a negative value.
+//
+// The algorithm is based on an original idea by Michael Eisel that was refined
+// by Daniel Lemire. See
+// https://lemire.me/blog/2020/03/10/fast-float-parsing-in-practice/
+// and
+// https://nigeltao.github.io/blog/2020/eisel-lemire.html
+//
+// Preconditions:
+//  - man is non-zero.
+//  - exp10 is in the range [-307 ..= 288], the same range of the
+//    wuffs_base__private_implementation__powers_of_10 array.
+//
+// The exp10 range (and the fact that man is in the range [1 ..= UINT64_MAX],
+// approximately [1 ..= 1.85e+19]) means that (man * (10 ** exp10)) is in the
+// range [1e-307 ..= 1.85e+307]. This is entirely within the range of normal
+// (neither subnormal nor non-finite) f64 values: DBL_MIN and DBL_MAX are
+// approximately 2.23e–308 and 1.80e+308.
+static int64_t  //
+wuffs_base__private_implementation__parse_number_f64_eisel_lemire(
+    uint64_t man,
+    int32_t exp10) {
+  // Look up the (possibly truncated) base-2 representation of (10 ** exp10).
+  // The look-up table was constructed so that it is already normalized: the
+  // table entry's mantissa's MSB (most significant bit) is on.
+  const uint64_t* po10 =
+      &wuffs_base__private_implementation__powers_of_10[exp10 + 307][0];
+
+  // Normalize the man argument. The (man != 0) precondition means that a
+  // non-zero bit exists.
+  uint32_t clz = wuffs_base__count_leading_zeroes_u64(man);
+  man <<= clz;
+
+  // Calculate the return value's base-2 exponent. We might tweak it by ±1
+  // later, but its initial value comes from a linear scaling of exp10,
+  // converting from power-of-10 to power-of-2, and adjusting by clz.
+  //
+  // The magic constants are:
+  //  - 1087 = 1023 + 64. The 1023 is the f64 exponent bias. The 64 is because
+  //    the look-up table uses 64-bit mantissas.
+  //  - 217706 is such that the ratio 217706 / 65536 ≈ 3.321930 is close enough
+  //    (over the practical range of exp10) to log(10) / log(2) ≈ 3.321928.
+  //  - 65536 = 1<<16 is arbitrary but a power of 2, so division is a shift.
+  //
+  // Equality of the linearly-scaled value and the actual power-of-2, over the
+  // range of exp10 arguments that this function accepts, is confirmed by
+  // script/print-mpb-powers-of-10.go
+  uint64_t ret_exp2 =
+      ((uint64_t)(((217706 * exp10) >> 16) + 1087)) - ((uint64_t)clz);
+
+  // Multiply the two mantissas. Normalization means that both mantissas are at
+  // least (1<<63), so the 128-bit product must be at least (1<<126). The high
+  // 64 bits of the product, x_hi, must therefore be at least (1<<62).
+  //
+  // As a consequence, x_hi has either 0 or 1 leading zeroes. Shifting x_hi
+  // right by either 9 or 10 bits (depending on x_hi's MSB) will therefore
+  // leave the top 10 MSBs (bits 54 ..= 63) off and the 11th MSB (bit 53) on.
+  wuffs_base__multiply_u64__output x = wuffs_base__multiply_u64(man, po10[1]);
+  uint64_t x_hi = x.hi;
+  uint64_t x_lo = x.lo;
+
+  // Before we shift right by at least 9 bits, recall that the look-up table
+  // entry was possibly truncated. We have so far only calculated a lower bound
+  // for the product (man * e), where e is (10 ** exp10). The upper bound would
+  // add a further (man * 1) to the 128-bit product, which overflows the lower
+  // 64-bit limb if ((x_lo + man) < man).
+  //
+  // If overflow occurs, that adds 1 to x_hi. Since we're about to shift right
+  // by at least 9 bits, that carried 1 can be ignored unless the higher 64-bit
+  // limb's low 9 bits are all on.
+  //
+  // For example, parsing "9999999999999999999" will take the if-true branch
+  // here, since:
+  //  - x_hi = 0x4563918244F3FFFF
+  //  - x_lo = 0x8000000000000000
+  //  - man  = 0x8AC7230489E7FFFF
+  if (((x_hi & 0x1FF) == 0x1FF) && ((x_lo + man) < man)) {
+    // Refine our calculation of (man * e). Before, our approximation of e used
+    // a "low resolution" 64-bit mantissa. Now use a "high resolution" 128-bit
+    // mantissa. We've already calculated x = (man * bits_0_to_63_incl_of_e).
+    // Now calculate y = (man * bits_64_to_127_incl_of_e).
+    wuffs_base__multiply_u64__output y = wuffs_base__multiply_u64(man, po10[0]);
+    uint64_t y_hi = y.hi;
+    uint64_t y_lo = y.lo;
+
+    // Merge the 128-bit x and 128-bit y, which overlap by 64 bits, to
+    // calculate the 192-bit product of the 64-bit man by the 128-bit e.
+    // As we exit this if-block, we only care about the high 128 bits
+    // (merged_hi and merged_lo) of that 192-bit product.
+    //
+    // For example, parsing "1.234e-45" will take the if-true branch here,
+    // since:
+    //  - x_hi = 0x70B7E3696DB29FFF
+    //  - x_lo = 0xE040000000000000
+    //  - y_hi = 0x33718BBEAB0E0D7A
+    //  - y_lo = 0xA880000000000000
+    uint64_t merged_hi = x_hi;
+    uint64_t merged_lo = x_lo + y_hi;
+    if (merged_lo < x_lo) {
+      merged_hi++;  // Carry the overflow bit.
+    }
+
+    // The "high resolution" approximation of e is still a lower bound. Once
+    // again, see if the upper bound is large enough to produce a different
+    // result. This time, if it does, give up instead of reaching for an even
+    // more precise approximation to e.
+    //
+    // This three-part check is similar to the two-part check that guarded the
+    // if block that we're now in, but it has an extra term for the middle 64
+    // bits (checking that adding 1 to merged_lo would overflow).
+    //
+    // For example, parsing "5.9604644775390625e-8" will take the if-true
+    // branch here, since:
+    //  - merged_hi = 0x7FFFFFFFFFFFFFFF
+    //  - merged_lo = 0xFFFFFFFFFFFFFFFF
+    //  - y_lo      = 0x4DB3FFC120988200
+    //  - man       = 0xD3C21BCECCEDA100
+    if (((merged_hi & 0x1FF) == 0x1FF) && ((merged_lo + 1) == 0) &&
+        (y_lo + man < man)) {
+      return -1;
+    }
+
+    // Replace the 128-bit x with merged.
+    x_hi = merged_hi;
+    x_lo = merged_lo;
+  }
+
+  // As mentioned above, shifting x_hi right by either 9 or 10 bits will leave
+  // the top 10 MSBs (bits 54 ..= 63) off and the 11th MSB (bit 53) on. If the
+  // MSB (before shifting) was on, adjust ret_exp2 for the larger shift.
+  //
+  // Having bit 53 on (and higher bits off) means that ret_mantissa is a 54-bit
+  // number.
+  uint64_t msb = x_hi >> 63;
+  uint64_t ret_mantissa = x_hi >> (msb + 9);
+  ret_exp2 -= 1 ^ msb;
+
+  // IEEE 754 rounds to-nearest with ties rounded to-even. Rounding to-even can
+  // be tricky. If we're half-way between two exactly representable numbers
+  // (x's low 73 bits are zero and the next 2 bits that matter are "01"), give
+  // up instead of trying to pick the winner.
+  //
+  // Technically, we could tighten the condition by changing "73" to "73 or 74,
+  // depending on msb", but a flat "73" is simpler.
+  //
+  // For example, parsing "1e+23" will take the if-true branch here, since:
+  //  - x_hi          = 0x54B40B1F852BDA00
+  //  - ret_mantissa  = 0x002A5A058FC295ED
+  if ((x_lo == 0) && ((x_hi & 0x1FF) == 0) && ((ret_mantissa & 3) == 1)) {
+    return -1;
+  }
+
+  // If we're not halfway then it's rounding to-nearest. Starting with a 54-bit
+  // number, carry the lowest bit (bit 0) up if it's on. Regardless of whether
+  // it was on or off, shifting right by one then produces a 53-bit number. If
+  // carrying up overflowed, shift again.
+  ret_mantissa += ret_mantissa & 1;
+  ret_mantissa >>= 1;
+  // This if block is equivalent to (but benchmarks slightly faster than) the
+  // following branchless form:
+  //    uint64_t overflow_adjustment = ret_mantissa >> 53;
+  //    ret_mantissa >>= overflow_adjustment;
+  //    ret_exp2 += overflow_adjustment;
+  //
+  // For example, parsing "7.2057594037927933e+16" will take the if-true
+  // branch here, since:
+  //  - x_hi          = 0x7FFFFFFFFFFFFE80
+  //  - ret_mantissa  = 0x0020000000000000
+  if ((ret_mantissa >> 53) > 0) {
+    ret_mantissa >>= 1;
+    ret_exp2++;
+  }
+
+  // Starting with a 53-bit number, IEEE 754 double-precision normal numbers
+  // have an implicit mantissa bit. Mask that away and keep the low 52 bits.
+  ret_mantissa &= 0x000FFFFFFFFFFFFF;
+
+  // Pack the bits and return.
+  return ((int64_t)(ret_mantissa | (ret_exp2 << 52)));
+}
+
+// --------
+
+static wuffs_base__result_f64  //
+wuffs_base__private_implementation__parse_number_f64_special(
+    wuffs_base__slice_u8 s,
+    uint32_t options) {
+  do {
+    if (options & WUFFS_BASE__PARSE_NUMBER_FXX__REJECT_INF_AND_NAN) {
+      goto fail;
+    }
+
+    uint8_t* p = s.ptr;
+    uint8_t* q = s.ptr + s.len;
+
+    for (; (p < q) && (*p == '_'); p++) {
+    }
+    if (p >= q) {
+      goto fail;
+    }
+
+    // Parse sign.
+    bool negative = false;
+    do {
+      if (*p == '+') {
+        p++;
+      } else if (*p == '-') {
+        negative = true;
+        p++;
+      } else {
+        break;
+      }
+      for (; (p < q) && (*p == '_'); p++) {
+      }
+    } while (0);
+    if (p >= q) {
+      goto fail;
+    }
+
+    bool nan = false;
+    switch (p[0]) {
+      case 'I':
+      case 'i':
+        if (((q - p) < 3) ||                     //
+            ((p[1] != 'N') && (p[1] != 'n')) ||  //
+            ((p[2] != 'F') && (p[2] != 'f'))) {
+          goto fail;
+        }
+        p += 3;
+
+        if ((p >= q) || (*p == '_')) {
+          break;
+        } else if (((q - p) < 5) ||                     //
+                   ((p[0] != 'I') && (p[0] != 'i')) ||  //
+                   ((p[1] != 'N') && (p[1] != 'n')) ||  //
+                   ((p[2] != 'I') && (p[2] != 'i')) ||  //
+                   ((p[3] != 'T') && (p[3] != 't')) ||  //
+                   ((p[4] != 'Y') && (p[4] != 'y'))) {
+          goto fail;
+        }
+        p += 5;
+
+        if ((p >= q) || (*p == '_')) {
+          break;
+        }
+        goto fail;
+
+      case 'N':
+      case 'n':
+        if (((q - p) < 3) ||                     //
+            ((p[1] != 'A') && (p[1] != 'a')) ||  //
+            ((p[2] != 'N') && (p[2] != 'n'))) {
+          goto fail;
+        }
+        p += 3;
+
+        if ((p >= q) || (*p == '_')) {
+          nan = true;
+          break;
+        }
+        goto fail;
+
+      default:
+        goto fail;
+    }
+
+    // Finish.
+    for (; (p < q) && (*p == '_'); p++) {
+    }
+    if (p != q) {
+      goto fail;
+    }
+    wuffs_base__result_f64 ret;
+    ret.status.repr = NULL;
+    ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
+        (nan ? 0x7FFFFFFFFFFFFFFF : 0x7FF0000000000000) |
+        (negative ? 0x8000000000000000 : 0));
+    return ret;
+  } while (0);
+
+fail:
+  do {
+    wuffs_base__result_f64 ret;
+    ret.status.repr = wuffs_base__error__bad_argument;
+    ret.value = 0;
+    return ret;
+  } while (0);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__result_f64  //
+wuffs_base__private_implementation__high_prec_dec__to_f64(
+    wuffs_base__private_implementation__high_prec_dec* h,
+    uint32_t options) {
+  do {
+    // powers converts decimal powers of 10 to binary powers of 2. For example,
+    // (10000 >> 13) is 1. It stops before the elements exceed 60, also known
+    // as WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL.
+    static const uint32_t num_powers = 19;
+    static const uint8_t powers[19] = {
+        0,  3,  6,  9,  13, 16, 19, 23, 26, 29,  //
+        33, 36, 39, 43, 46, 49, 53, 56, 59,      //
+    };
+
+    // Handle zero and obvious extremes. The largest and smallest positive
+    // finite f64 values are approximately 1.8e+308 and 4.9e-324.
+    if ((h->num_digits == 0) || (h->decimal_point < -326)) {
+      goto zero;
+    } else if (h->decimal_point > 310) {
+      goto infinity;
+    }
+
+    // Try the fast Eisel-Lemire algorithm again. Calculating the (man, exp10)
+    // pair from the high_prec_dec h is more correct but slower than the
+    // approach taken in wuffs_base__parse_number_f64. The latter is optimized
+    // for the common cases (e.g. assuming no underscores or a leading '+'
+    // sign) rather than the full set of cases allowed by the Wuffs API.
+    if (h->num_digits <= 19) {
+      uint64_t man = 0;
+      uint32_t i;
+      for (i = 0; i < h->num_digits; i++) {
+        man = (10 * man) + h->digits[i];
+      }
+      int32_t exp10 = h->decimal_point - ((int32_t)(h->num_digits));
+      if ((man != 0) && (-307 <= exp10) && (exp10 <= 288)) {
+        int64_t r =
+            wuffs_base__private_implementation__parse_number_f64_eisel_lemire(
+                man, exp10);
+        if (r >= 0) {
+          wuffs_base__result_f64 ret;
+          ret.status.repr = NULL;
+          ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
+              ((uint64_t)r) | (((uint64_t)(h->negative)) << 63));
+          return ret;
+        }
+      }
+    }
+
+    // When Eisel-Lemire fails, fall back to Simple Decimal Conversion. See
+    // https://nigeltao.github.io/blog/2020/parse-number-f64-simple.html
+    //
+    // Scale by powers of 2 until we're in the range [½ .. 1], which gives us
+    // our exponent (in base-2). First we shift right, possibly a little too
+    // far, ending with a value certainly below 1 and possibly below ½...
+    const int32_t f64_bias = -1023;
+    int32_t exp2 = 0;
+    while (h->decimal_point > 0) {
+      uint32_t n = (uint32_t)(+h->decimal_point);
+      uint32_t shift =
+          (n < num_powers)
+              ? powers[n]
+              : WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL;
+
+      wuffs_base__private_implementation__high_prec_dec__small_rshift(h, shift);
+      if (h->decimal_point <
+          -WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE) {
+        goto zero;
+      }
+      exp2 += (int32_t)shift;
+    }
+    // ...then we shift left, putting us in [½ .. 1].
+    while (h->decimal_point <= 0) {
+      uint32_t shift;
+      if (h->decimal_point == 0) {
+        if (h->digits[0] >= 5) {
+          break;
+        }
+        shift = (h->digits[0] < 2) ? 2 : 1;
+      } else {
+        uint32_t n = (uint32_t)(-h->decimal_point);
+        shift = (n < num_powers)
+                    ? powers[n]
+                    : WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL;
+      }
+
+      wuffs_base__private_implementation__high_prec_dec__small_lshift(h, shift);
+      if (h->decimal_point >
+          +WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__DECIMAL_POINT__RANGE) {
+        goto infinity;
+      }
+      exp2 -= (int32_t)shift;
+    }
+
+    // We're in the range [½ .. 1] but f64 uses [1 .. 2].
+    exp2--;
+
+    // The minimum normal exponent is (f64_bias + 1).
+    while ((f64_bias + 1) > exp2) {
+      uint32_t n = (uint32_t)((f64_bias + 1) - exp2);
+      if (n > WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL) {
+        n = WUFFS_BASE__PRIVATE_IMPLEMENTATION__HPD__SHIFT__MAX_INCL;
+      }
+      wuffs_base__private_implementation__high_prec_dec__small_rshift(h, n);
+      exp2 += (int32_t)n;
+    }
+
+    // Check for overflow.
+    if ((exp2 - f64_bias) >= 0x07FF) {  // (1 << 11) - 1.
+      goto infinity;
+    }
+
+    // Extract 53 bits for the mantissa (in base-2).
+    wuffs_base__private_implementation__high_prec_dec__small_lshift(h, 53);
+    uint64_t man2 =
+        wuffs_base__private_implementation__high_prec_dec__rounded_integer(h);
+
+    // Rounding might have added one bit. If so, shift and re-check overflow.
+    if ((man2 >> 53) != 0) {
+      man2 >>= 1;
+      exp2++;
+      if ((exp2 - f64_bias) >= 0x07FF) {  // (1 << 11) - 1.
+        goto infinity;
+      }
+    }
+
+    // Handle subnormal numbers.
+    if ((man2 >> 52) == 0) {
+      exp2 = f64_bias;
+    }
+
+    // Pack the bits and return.
+    uint64_t exp2_bits =
+        (uint64_t)((exp2 - f64_bias) & 0x07FF);              // (1 << 11) - 1.
+    uint64_t bits = (man2 & 0x000FFFFFFFFFFFFF) |            // (1 << 52) - 1.
+                    (exp2_bits << 52) |                      //
+                    (h->negative ? 0x8000000000000000 : 0);  // (1 << 63).
+
+    wuffs_base__result_f64 ret;
+    ret.status.repr = NULL;
+    ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(bits);
+    return ret;
+  } while (0);
+
+zero:
+  do {
+    uint64_t bits = h->negative ? 0x8000000000000000 : 0;
+
+    wuffs_base__result_f64 ret;
+    ret.status.repr = NULL;
+    ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(bits);
+    return ret;
+  } while (0);
+
+infinity:
+  do {
+    if (options & WUFFS_BASE__PARSE_NUMBER_FXX__REJECT_INF_AND_NAN) {
+      wuffs_base__result_f64 ret;
+      ret.status.repr = wuffs_base__error__bad_argument;
+      ret.value = 0;
+      return ret;
+    }
+
+    uint64_t bits = h->negative ? 0xFFF0000000000000 : 0x7FF0000000000000;
+
+    wuffs_base__result_f64 ret;
+    ret.status.repr = NULL;
+    ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(bits);
+    return ret;
+  } while (0);
+}
+
+static inline bool  //
+wuffs_base__private_implementation__is_decimal_digit(uint8_t c) {
+  return ('0' <= c) && (c <= '9');
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__result_f64  //
+wuffs_base__parse_number_f64(wuffs_base__slice_u8 s, uint32_t options) {
+  // In practice, almost all "dd.ddddE±xxx" numbers can be represented
+  // losslessly by a uint64_t mantissa "dddddd" and an int32_t base-10
+  // exponent, adjusting "xxx" for the position (if present) of the decimal
+  // separator '.' or ','.
+  //
+  // This (u64 man, i32 exp10) data structure is superficially similar to the
+  // "Do It Yourself Floating Point" type from Loitsch (†), but the exponent
+  // here is base-10, not base-2.
+  //
+  // If s's number fits in a (man, exp10), parse that pair with the
+  // Eisel-Lemire algorithm. If not, or if Eisel-Lemire fails, parsing s with
+  // the fallback algorithm is slower but comprehensive.
+  //
+  // † "Printing Floating-Point Numbers Quickly and Accurately with Integers"
+  // (https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf).
+  // Florian Loitsch is also the primary contributor to
+  // https://github.com/google/double-conversion
+  do {
+    // Calculating that (man, exp10) pair needs to stay within s's bounds.
+    // Provided that s isn't extremely long, work on a NUL-terminated copy of
+    // s's contents. The NUL byte isn't a valid part of "±dd.ddddE±xxx".
+    //
+    // As the pointer p walks the contents, it's faster to repeatedly check "is
+    // *p a valid digit" than "is p within bounds and *p a valid digit".
+    if (s.len >= 256) {
+      goto fallback;
+    }
+    uint8_t z[256];
+    memcpy(&z[0], s.ptr, s.len);
+    z[s.len] = 0;
+    const uint8_t* p = &z[0];
+
+    // Look for a leading minus sign. Technically, we could also look for an
+    // optional plus sign, but the "script/process-json-numbers.c with -p"
+    // benchmark is noticably slower if we do. It's optional and, in practice,
+    // usually absent. Let the fallback catch it.
+    bool negative = (*p == '-');
+    if (negative) {
+      p++;
+    }
+
+    // After walking "dd.dddd", comparing p later with p now will produce the
+    // number of "d"s and "."s.
+    const uint8_t* const start_of_digits_ptr = p;
+
+    // Walk the "d"s before a '.', 'E', NUL byte, etc. If it starts with '0',
+    // it must be a single '0'. If it starts with a non-zero decimal digit, it
+    // can be a sequence of decimal digits.
+    //
+    // Update the man variable during the walk. It's OK if man overflows now.
+    // We'll detect that later.
+    uint64_t man;
+    if (*p == '0') {
+      man = 0;
+      p++;
+      if (wuffs_base__private_implementation__is_decimal_digit(*p)) {
+        goto fallback;
+      }
+    } else if (wuffs_base__private_implementation__is_decimal_digit(*p)) {
+      man = ((uint8_t)(*p - '0'));
+      p++;
+      for (; wuffs_base__private_implementation__is_decimal_digit(*p); p++) {
+        man = (10 * man) + ((uint8_t)(*p - '0'));
+      }
+    } else {
+      goto fallback;
+    }
+
+    // Walk the "d"s after the optional decimal separator ('.' or ','),
+    // updating the man and exp10 variables.
+    int32_t exp10 = 0;
+    if (*p ==
+        ((options & WUFFS_BASE__PARSE_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
+             ? ','
+             : '.')) {
+      p++;
+      const uint8_t* first_after_separator_ptr = p;
+      if (!wuffs_base__private_implementation__is_decimal_digit(*p)) {
+        goto fallback;
+      }
+      man = (10 * man) + ((uint8_t)(*p - '0'));
+      p++;
+      for (; wuffs_base__private_implementation__is_decimal_digit(*p); p++) {
+        man = (10 * man) + ((uint8_t)(*p - '0'));
+      }
+      exp10 = ((int32_t)(first_after_separator_ptr - p));
+    }
+
+    // Count the number of digits:
+    //  - for an input of "314159",  digit_count is 6.
+    //  - for an input of "3.14159", digit_count is 7.
+    //
+    // This is off-by-one if there is a decimal separator. That's OK for now.
+    // We'll correct for that later. The "script/process-json-numbers.c with
+    // -p" benchmark is noticably slower if we try to correct for that now.
+    uint32_t digit_count = (uint32_t)(p - start_of_digits_ptr);
+
+    // Update exp10 for the optional exponent, starting with 'E' or 'e'.
+    if ((*p | 0x20) == 'e') {
+      p++;
+      int32_t exp_sign = +1;
+      if (*p == '-') {
+        p++;
+        exp_sign = -1;
+      } else if (*p == '+') {
+        p++;
+      }
+      if (!wuffs_base__private_implementation__is_decimal_digit(*p)) {
+        goto fallback;
+      }
+      int32_t exp_num = ((uint8_t)(*p - '0'));
+      p++;
+      // The rest of the exp_num walking has a peculiar control flow but, once
+      // again, the "script/process-json-numbers.c with -p" benchmark is
+      // sensitive to alternative formulations.
+      if (wuffs_base__private_implementation__is_decimal_digit(*p)) {
+        exp_num = (10 * exp_num) + ((uint8_t)(*p - '0'));
+        p++;
+      }
+      if (wuffs_base__private_implementation__is_decimal_digit(*p)) {
+        exp_num = (10 * exp_num) + ((uint8_t)(*p - '0'));
+        p++;
+      }
+      while (wuffs_base__private_implementation__is_decimal_digit(*p)) {
+        if (exp_num > 0x1000000) {
+          goto fallback;
+        }
+        exp_num = (10 * exp_num) + ((uint8_t)(*p - '0'));
+        p++;
+      }
+      exp10 += exp_sign * exp_num;
+    }
+
+    // The Wuffs API is that the original slice has no trailing data. It also
+    // allows underscores, which we don't catch here but the fallback should.
+    if (p != &z[s.len]) {
+      goto fallback;
+    }
+
+    // Check that the uint64_t typed man variable has not overflowed, based on
+    // digit_count.
+    //
+    // For reference:
+    //   - (1 << 63) is  9223372036854775808, which has 19 decimal digits.
+    //   - (1 << 64) is 18446744073709551616, which has 20 decimal digits.
+    //   - 19 nines,  9999999999999999999, is  0x8AC7230489E7FFFF, which has 64
+    //     bits and 16 hexadecimal digits.
+    //   - 20 nines, 99999999999999999999, is 0x56BC75E2D630FFFFF, which has 67
+    //     bits and 17 hexadecimal digits.
+    if (digit_count > 19) {
+      // Even if we have more than 19 pseudo-digits, it's not yet definitely an
+      // overflow. Recall that digit_count might be off-by-one (too large) if
+      // there's a decimal separator. It will also over-report the number of
+      // meaningful digits if the input looks something like "0.000dddExxx".
+      //
+      // We adjust by the number of leading '0's and '.'s and re-compare to 19.
+      // Once again, technically, we could skip ','s too, but that perturbs the
+      // "script/process-json-numbers.c with -p" benchmark.
+      const uint8_t* q = start_of_digits_ptr;
+      for (; (*q == '0') || (*q == '.'); q++) {
+      }
+      digit_count -= (uint32_t)(q - start_of_digits_ptr);
+      if (digit_count > 19) {
+        goto fallback;
+      }
+    }
+
+    // The wuffs_base__private_implementation__parse_number_f64_eisel_lemire
+    // preconditions include that exp10 is in the range [-307 ..= 288].
+    if ((exp10 < -307) || (288 < exp10)) {
+      goto fallback;
+    }
+
+    // If both man and (10 ** exp10) are exactly representable by a double, we
+    // don't need to run the Eisel-Lemire algorithm.
+    if ((-22 <= exp10) && (exp10 <= 22) && ((man >> 53) == 0)) {
+      double d = (double)man;
+      if (exp10 >= 0) {
+        d *= wuffs_base__private_implementation__f64_powers_of_10[+exp10];
+      } else {
+        d /= wuffs_base__private_implementation__f64_powers_of_10[-exp10];
+      }
+      wuffs_base__result_f64 ret;
+      ret.status.repr = NULL;
+      ret.value = negative ? -d : +d;
+      return ret;
+    }
+
+    // The wuffs_base__private_implementation__parse_number_f64_eisel_lemire
+    // preconditions include that man is non-zero. Parsing "0" should be caught
+    // by the "If both man and (10 ** exp10)" above, but "0e99" might not.
+    if (man == 0) {
+      goto fallback;
+    }
+
+    // Our man and exp10 are in range. Run the Eisel-Lemire algorithm.
+    int64_t r =
+        wuffs_base__private_implementation__parse_number_f64_eisel_lemire(
+            man, exp10);
+    if (r < 0) {
+      goto fallback;
+    }
+    wuffs_base__result_f64 ret;
+    ret.status.repr = NULL;
+    ret.value = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
+        ((uint64_t)r) | (((uint64_t)negative) << 63));
+    return ret;
+  } while (0);
+
+fallback:
+  do {
+    wuffs_base__private_implementation__high_prec_dec h;
+    wuffs_base__status status =
+        wuffs_base__private_implementation__high_prec_dec__parse(&h, s,
+                                                                 options);
+    if (status.repr) {
+      return wuffs_base__private_implementation__parse_number_f64_special(
+          s, options);
+    }
+    return wuffs_base__private_implementation__high_prec_dec__to_f64(&h,
+                                                                     options);
+  } while (0);
+}
+
+// --------
+
+static inline size_t  //
+wuffs_base__private_implementation__render_inf(wuffs_base__slice_u8 dst,
+                                               bool neg,
+                                               uint32_t options) {
+  if (neg) {
+    if (dst.len < 4) {
+      return 0;
+    }
+    wuffs_base__poke_u32le__no_bounds_check(dst.ptr, 0x666E492D);  // '-Inf'le.
+    return 4;
+  }
+
+  if (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN) {
+    if (dst.len < 4) {
+      return 0;
+    }
+    wuffs_base__poke_u32le__no_bounds_check(dst.ptr, 0x666E492B);  // '+Inf'le.
+    return 4;
+  }
+
+  if (dst.len < 3) {
+    return 0;
+  }
+  wuffs_base__poke_u24le__no_bounds_check(dst.ptr, 0x666E49);  // 'Inf'le.
+  return 3;
+}
+
+static inline size_t  //
+wuffs_base__private_implementation__render_nan(wuffs_base__slice_u8 dst) {
+  if (dst.len < 3) {
+    return 0;
+  }
+  wuffs_base__poke_u24le__no_bounds_check(dst.ptr, 0x4E614E);  // 'NaN'le.
+  return 3;
+}
+
+static size_t  //
+wuffs_base__private_implementation__high_prec_dec__render_exponent_absent(
+    wuffs_base__slice_u8 dst,
+    wuffs_base__private_implementation__high_prec_dec* h,
+    uint32_t precision,
+    uint32_t options) {
+  size_t n = (h->negative ||
+              (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN))
+                 ? 1
+                 : 0;
+  if (h->decimal_point <= 0) {
+    n += 1;
+  } else {
+    n += (size_t)(h->decimal_point);
+  }
+  if (precision > 0) {
+    n += precision + 1;  // +1 for the '.'.
+  }
+
+  // Don't modify dst if the formatted number won't fit.
+  if (n > dst.len) {
+    return 0;
+  }
+
+  // Align-left or align-right.
+  uint8_t* ptr = (options & WUFFS_BASE__RENDER_NUMBER_XXX__ALIGN_RIGHT)
+                     ? &dst.ptr[dst.len - n]
+                     : &dst.ptr[0];
+
+  // Leading "±".
+  if (h->negative) {
+    *ptr++ = '-';
+  } else if (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN) {
+    *ptr++ = '+';
+  }
+
+  // Integral digits.
+  if (h->decimal_point <= 0) {
+    *ptr++ = '0';
+  } else {
+    uint32_t m =
+        wuffs_base__u32__min(h->num_digits, (uint32_t)(h->decimal_point));
+    uint32_t i = 0;
+    for (; i < m; i++) {
+      *ptr++ = (uint8_t)('0' | h->digits[i]);
+    }
+    for (; i < (uint32_t)(h->decimal_point); i++) {
+      *ptr++ = '0';
+    }
+  }
+
+  // Separator and then fractional digits.
+  if (precision > 0) {
+    *ptr++ =
+        (options & WUFFS_BASE__RENDER_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
+            ? ','
+            : '.';
+    uint32_t i = 0;
+    for (; i < precision; i++) {
+      uint32_t j = ((uint32_t)(h->decimal_point)) + i;
+      *ptr++ = (uint8_t)('0' | ((j < h->num_digits) ? h->digits[j] : 0));
+    }
+  }
+
+  return n;
+}
+
+static size_t  //
+wuffs_base__private_implementation__high_prec_dec__render_exponent_present(
+    wuffs_base__slice_u8 dst,
+    wuffs_base__private_implementation__high_prec_dec* h,
+    uint32_t precision,
+    uint32_t options) {
+  int32_t exp = 0;
+  if (h->num_digits > 0) {
+    exp = h->decimal_point - 1;
+  }
+  bool negative_exp = exp < 0;
+  if (negative_exp) {
+    exp = -exp;
+  }
+
+  size_t n = (h->negative ||
+              (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN))
+                 ? 4
+                 : 3;  // Mininum 3 bytes: first digit and then "e±".
+  if (precision > 0) {
+    n += precision + 1;  // +1 for the '.'.
+  }
+  n += (exp < 100) ? 2 : 3;
+
+  // Don't modify dst if the formatted number won't fit.
+  if (n > dst.len) {
+    return 0;
+  }
+
+  // Align-left or align-right.
+  uint8_t* ptr = (options & WUFFS_BASE__RENDER_NUMBER_XXX__ALIGN_RIGHT)
+                     ? &dst.ptr[dst.len - n]
+                     : &dst.ptr[0];
+
+  // Leading "±".
+  if (h->negative) {
+    *ptr++ = '-';
+  } else if (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN) {
+    *ptr++ = '+';
+  }
+
+  // Integral digit.
+  if (h->num_digits > 0) {
+    *ptr++ = (uint8_t)('0' | h->digits[0]);
+  } else {
+    *ptr++ = '0';
+  }
+
+  // Separator and then fractional digits.
+  if (precision > 0) {
+    *ptr++ =
+        (options & WUFFS_BASE__RENDER_NUMBER_FXX__DECIMAL_SEPARATOR_IS_A_COMMA)
+            ? ','
+            : '.';
+    uint32_t i = 1;
+    uint32_t j = wuffs_base__u32__min(h->num_digits, precision + 1);
+    for (; i < j; i++) {
+      *ptr++ = (uint8_t)('0' | h->digits[i]);
+    }
+    for (; i <= precision; i++) {
+      *ptr++ = '0';
+    }
+  }
+
+  // Exponent: "e±" and then 2 or 3 digits.
+  *ptr++ = 'e';
+  *ptr++ = negative_exp ? '-' : '+';
+  if (exp < 10) {
+    *ptr++ = '0';
+    *ptr++ = (uint8_t)('0' | exp);
+  } else if (exp < 100) {
+    *ptr++ = (uint8_t)('0' | (exp / 10));
+    *ptr++ = (uint8_t)('0' | (exp % 10));
+  } else {
+    int32_t e = exp / 100;
+    exp -= e * 100;
+    *ptr++ = (uint8_t)('0' | e);
+    *ptr++ = (uint8_t)('0' | (exp / 10));
+    *ptr++ = (uint8_t)('0' | (exp % 10));
+  }
+
+  return n;
+}
+
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__render_number_f64(wuffs_base__slice_u8 dst,
+                              double x,
+                              uint32_t precision,
+                              uint32_t options) {
+  // Decompose x (64 bits) into negativity (1 bit), base-2 exponent (11 bits
+  // with a -1023 bias) and mantissa (52 bits).
+  uint64_t bits = wuffs_base__ieee_754_bit_representation__from_f64_to_u64(x);
+  bool neg = (bits >> 63) != 0;
+  int32_t exp2 = ((int32_t)(bits >> 52)) & 0x7FF;
+  uint64_t man = bits & 0x000FFFFFFFFFFFFFul;
+
+  // Apply the exponent bias and set the implicit top bit of the mantissa,
+  // unless x is subnormal. Also take care of Inf and NaN.
+  if (exp2 == 0x7FF) {
+    if (man != 0) {
+      return wuffs_base__private_implementation__render_nan(dst);
+    }
+    return wuffs_base__private_implementation__render_inf(dst, neg, options);
+  } else if (exp2 == 0) {
+    exp2 = -1022;
+  } else {
+    exp2 -= 1023;
+    man |= 0x0010000000000000ul;
+  }
+
+  // Ensure that precision isn't too large.
+  if (precision > 4095) {
+    precision = 4095;
+  }
+
+  // Convert from the (neg, exp2, man) tuple to an HPD.
+  wuffs_base__private_implementation__high_prec_dec h;
+  wuffs_base__private_implementation__high_prec_dec__assign(&h, man, neg);
+  if (h.num_digits > 0) {
+    wuffs_base__private_implementation__high_prec_dec__lshift(
+        &h, exp2 - 52);  // 52 mantissa bits.
+  }
+
+  // Handle the "%e" and "%f" formats.
+  switch (options & (WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_ABSENT |
+                     WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_PRESENT)) {
+    case WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_ABSENT:  // The "%"f" format.
+      if (options & WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION) {
+        wuffs_base__private_implementation__high_prec_dec__round_just_enough(
+            &h, exp2, man);
+        int32_t p = ((int32_t)(h.num_digits)) - h.decimal_point;
+        precision = ((uint32_t)(wuffs_base__i32__max(0, p)));
+      } else {
+        wuffs_base__private_implementation__high_prec_dec__round_nearest(
+            &h, ((int32_t)precision) + h.decimal_point);
+      }
+      return wuffs_base__private_implementation__high_prec_dec__render_exponent_absent(
+          dst, &h, precision, options);
+
+    case WUFFS_BASE__RENDER_NUMBER_FXX__EXPONENT_PRESENT:  // The "%e" format.
+      if (options & WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION) {
+        wuffs_base__private_implementation__high_prec_dec__round_just_enough(
+            &h, exp2, man);
+        precision = (h.num_digits > 0) ? (h.num_digits - 1) : 0;
+      } else {
+        wuffs_base__private_implementation__high_prec_dec__round_nearest(
+            &h, ((int32_t)precision) + 1);
+      }
+      return wuffs_base__private_implementation__high_prec_dec__render_exponent_present(
+          dst, &h, precision, options);
+  }
+
+  // We have the "%g" format and so precision means the number of significant
+  // digits, not the number of digits after the decimal separator. Perform
+  // rounding and determine whether to use "%e" or "%f".
+  int32_t e_threshold = 0;
+  if (options & WUFFS_BASE__RENDER_NUMBER_FXX__JUST_ENOUGH_PRECISION) {
+    wuffs_base__private_implementation__high_prec_dec__round_just_enough(
+        &h, exp2, man);
+    precision = h.num_digits;
+    e_threshold = 6;
+  } else {
+    if (precision == 0) {
+      precision = 1;
+    }
+    wuffs_base__private_implementation__high_prec_dec__round_nearest(
+        &h, ((int32_t)precision));
+    e_threshold = ((int32_t)precision);
+    int32_t nd = ((int32_t)(h.num_digits));
+    if ((e_threshold > nd) && (nd >= h.decimal_point)) {
+      e_threshold = nd;
+    }
+  }
+
+  // Use the "%e" format if the exponent is large.
+  int32_t e = h.decimal_point - 1;
+  if ((e < -4) || (e_threshold <= e)) {
+    uint32_t p = wuffs_base__u32__min(precision, h.num_digits);
+    return wuffs_base__private_implementation__high_prec_dec__render_exponent_present(
+        dst, &h, (p > 0) ? (p - 1) : 0, options);
+  }
+
+  // Use the "%f" format otherwise.
+  int32_t p = ((int32_t)precision);
+  if (p > h.decimal_point) {
+    p = ((int32_t)(h.num_digits));
+  }
+  precision = ((uint32_t)(wuffs_base__i32__max(0, p - h.decimal_point)));
+  return wuffs_base__private_implementation__high_prec_dec__render_exponent_absent(
+      dst, &h, precision, options);
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE__FLOATCONV)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
+    defined(WUFFS_CONFIG__MODULE__BASE__INTCONV)
+
+// ---------------- Integer
+
+// wuffs_base__parse_number__foo_digits entries are 0x00 for invalid digits,
+// and (0x80 | v) for valid digits, where v is the 4 bit value.
+
+static const uint8_t wuffs_base__parse_number__decimal_digits[256] = {
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x00 ..= 0x07.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x08 ..= 0x0F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x10 ..= 0x17.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x18 ..= 0x1F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x20 ..= 0x27.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x28 ..= 0x2F.
+    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,  // 0x30 ..= 0x37. '0'-'7'.
+    0x88, 0x89, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x38 ..= 0x3F. '8'-'9'.
+
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x40 ..= 0x47.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x48 ..= 0x4F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x50 ..= 0x57.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x58 ..= 0x5F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x60 ..= 0x67.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x68 ..= 0x6F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x70 ..= 0x77.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x78 ..= 0x7F.
+
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x80 ..= 0x87.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x88 ..= 0x8F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x90 ..= 0x97.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x98 ..= 0x9F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xA0 ..= 0xA7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xA8 ..= 0xAF.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xB0 ..= 0xB7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xB8 ..= 0xBF.
+
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xC0 ..= 0xC7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xC8 ..= 0xCF.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xD0 ..= 0xD7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xD8 ..= 0xDF.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xE0 ..= 0xE7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xE8 ..= 0xEF.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xF0 ..= 0xF7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xF8 ..= 0xFF.
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+};
+
+static const uint8_t wuffs_base__parse_number__hexadecimal_digits[256] = {
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x00 ..= 0x07.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x08 ..= 0x0F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x10 ..= 0x17.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x18 ..= 0x1F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x20 ..= 0x27.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x28 ..= 0x2F.
+    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,  // 0x30 ..= 0x37. '0'-'7'.
+    0x88, 0x89, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x38 ..= 0x3F. '8'-'9'.
+
+    0x00, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x00,  // 0x40 ..= 0x47. 'A'-'F'.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x48 ..= 0x4F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x50 ..= 0x57.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x58 ..= 0x5F.
+    0x00, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x00,  // 0x60 ..= 0x67. 'a'-'f'.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x68 ..= 0x6F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x70 ..= 0x77.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x78 ..= 0x7F.
+
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x80 ..= 0x87.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x88 ..= 0x8F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x90 ..= 0x97.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x98 ..= 0x9F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xA0 ..= 0xA7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xA8 ..= 0xAF.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xB0 ..= 0xB7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xB8 ..= 0xBF.
+
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xC0 ..= 0xC7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xC8 ..= 0xCF.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xD0 ..= 0xD7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xD8 ..= 0xDF.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xE0 ..= 0xE7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xE8 ..= 0xEF.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xF0 ..= 0xF7.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0xF8 ..= 0xFF.
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+};
+
+static const uint8_t wuffs_base__private_implementation__encode_base16[16] = {
+    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,  // 0x00 ..= 0x07.
+    0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,  // 0x08 ..= 0x0F.
+};
+
+// --------
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__result_i64  //
+wuffs_base__parse_number_i64(wuffs_base__slice_u8 s, uint32_t options) {
+  uint8_t* p = s.ptr;
+  uint8_t* q = s.ptr + s.len;
+
+  if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
+    for (; (p < q) && (*p == '_'); p++) {
+    }
+  }
+
+  bool negative = false;
+  if (p >= q) {
+    goto fail_bad_argument;
+  } else if (*p == '-') {
+    p++;
+    negative = true;
+  } else if (*p == '+') {
+    p++;
+  }
+
+  do {
+    wuffs_base__result_u64 r = wuffs_base__parse_number_u64(
+        wuffs_base__make_slice_u8(p, (size_t)(q - p)), options);
+    if (r.status.repr != NULL) {
+      wuffs_base__result_i64 ret;
+      ret.status.repr = r.status.repr;
+      ret.value = 0;
+      return ret;
+    } else if (negative) {
+      if (r.value < 0x8000000000000000) {
+        wuffs_base__result_i64 ret;
+        ret.status.repr = NULL;
+        ret.value = -(int64_t)(r.value);
+        return ret;
+      } else if (r.value == 0x8000000000000000) {
+        wuffs_base__result_i64 ret;
+        ret.status.repr = NULL;
+        ret.value = INT64_MIN;
+        return ret;
+      }
+      goto fail_out_of_bounds;
+    } else if (r.value > 0x7FFFFFFFFFFFFFFF) {
+      goto fail_out_of_bounds;
+    } else {
+      wuffs_base__result_i64 ret;
+      ret.status.repr = NULL;
+      ret.value = +(int64_t)(r.value);
+      return ret;
+    }
+  } while (0);
+
+fail_bad_argument:
+  do {
+    wuffs_base__result_i64 ret;
+    ret.status.repr = wuffs_base__error__bad_argument;
+    ret.value = 0;
+    return ret;
+  } while (0);
+
+fail_out_of_bounds:
+  do {
+    wuffs_base__result_i64 ret;
+    ret.status.repr = wuffs_base__error__out_of_bounds;
+    ret.value = 0;
+    return ret;
+  } while (0);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__result_u64  //
+wuffs_base__parse_number_u64(wuffs_base__slice_u8 s, uint32_t options) {
+  uint8_t* p = s.ptr;
+  uint8_t* q = s.ptr + s.len;
+
+  if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
+    for (; (p < q) && (*p == '_'); p++) {
+    }
+  }
+
+  if (p >= q) {
+    goto fail_bad_argument;
+
+  } else if (*p == '0') {
+    p++;
+    if (p >= q) {
+      goto ok_zero;
+    }
+    if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
+      if (*p == '_') {
+        p++;
+        for (; p < q; p++) {
+          if (*p != '_') {
+            if (options &
+                WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_MULTIPLE_LEADING_ZEROES) {
+              goto decimal;
+            }
+            goto fail_bad_argument;
+          }
+        }
+        goto ok_zero;
+      }
+    }
+
+    if ((*p == 'x') || (*p == 'X')) {
+      p++;
+      if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
+        for (; (p < q) && (*p == '_'); p++) {
+        }
+      }
+      if (p < q) {
+        goto hexadecimal;
+      }
+
+    } else if ((*p == 'd') || (*p == 'D')) {
+      p++;
+      if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES) {
+        for (; (p < q) && (*p == '_'); p++) {
+        }
+      }
+      if (p < q) {
+        goto decimal;
+      }
+    }
+
+    if (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_MULTIPLE_LEADING_ZEROES) {
+      goto decimal;
+    }
+    goto fail_bad_argument;
+  }
+
+decimal:
+  do {
+    uint64_t v = wuffs_base__parse_number__decimal_digits[*p++];
+    if (v == 0) {
+      goto fail_bad_argument;
+    }
+    v &= 0x0F;
+
+    // UINT64_MAX is 18446744073709551615, which is ((10 * max10) + max1).
+    const uint64_t max10 = 1844674407370955161u;
+    const uint8_t max1 = 5;
+
+    for (; p < q; p++) {
+      if ((*p == '_') &&
+          (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
+        continue;
+      }
+      uint8_t digit = wuffs_base__parse_number__decimal_digits[*p];
+      if (digit == 0) {
+        goto fail_bad_argument;
+      }
+      digit &= 0x0F;
+      if ((v > max10) || ((v == max10) && (digit > max1))) {
+        goto fail_out_of_bounds;
+      }
+      v = (10 * v) + ((uint64_t)(digit));
+    }
+
+    wuffs_base__result_u64 ret;
+    ret.status.repr = NULL;
+    ret.value = v;
+    return ret;
+  } while (0);
+
+hexadecimal:
+  do {
+    uint64_t v = wuffs_base__parse_number__hexadecimal_digits[*p++];
+    if (v == 0) {
+      goto fail_bad_argument;
+    }
+    v &= 0x0F;
+
+    for (; p < q; p++) {
+      if ((*p == '_') &&
+          (options & WUFFS_BASE__PARSE_NUMBER_XXX__ALLOW_UNDERSCORES)) {
+        continue;
+      }
+      uint8_t digit = wuffs_base__parse_number__hexadecimal_digits[*p];
+      if (digit == 0) {
+        goto fail_bad_argument;
+      }
+      digit &= 0x0F;
+      if ((v >> 60) != 0) {
+        goto fail_out_of_bounds;
+      }
+      v = (v << 4) | ((uint64_t)(digit));
+    }
+
+    wuffs_base__result_u64 ret;
+    ret.status.repr = NULL;
+    ret.value = v;
+    return ret;
+  } while (0);
+
+ok_zero:
+  do {
+    wuffs_base__result_u64 ret;
+    ret.status.repr = NULL;
+    ret.value = 0;
+    return ret;
+  } while (0);
+
+fail_bad_argument:
+  do {
+    wuffs_base__result_u64 ret;
+    ret.status.repr = wuffs_base__error__bad_argument;
+    ret.value = 0;
+    return ret;
+  } while (0);
+
+fail_out_of_bounds:
+  do {
+    wuffs_base__result_u64 ret;
+    ret.status.repr = wuffs_base__error__out_of_bounds;
+    ret.value = 0;
+    return ret;
+  } while (0);
+}
+
+// --------
+
+// wuffs_base__render_number__first_hundred contains the decimal encodings of
+// the first one hundred numbers [0 ..= 99].
+static const uint8_t wuffs_base__render_number__first_hundred[200] = {
+    '0', '0', '0', '1', '0', '2', '0', '3', '0', '4',  //
+    '0', '5', '0', '6', '0', '7', '0', '8', '0', '9',  //
+    '1', '0', '1', '1', '1', '2', '1', '3', '1', '4',  //
+    '1', '5', '1', '6', '1', '7', '1', '8', '1', '9',  //
+    '2', '0', '2', '1', '2', '2', '2', '3', '2', '4',  //
+    '2', '5', '2', '6', '2', '7', '2', '8', '2', '9',  //
+    '3', '0', '3', '1', '3', '2', '3', '3', '3', '4',  //
+    '3', '5', '3', '6', '3', '7', '3', '8', '3', '9',  //
+    '4', '0', '4', '1', '4', '2', '4', '3', '4', '4',  //
+    '4', '5', '4', '6', '4', '7', '4', '8', '4', '9',  //
+    '5', '0', '5', '1', '5', '2', '5', '3', '5', '4',  //
+    '5', '5', '5', '6', '5', '7', '5', '8', '5', '9',  //
+    '6', '0', '6', '1', '6', '2', '6', '3', '6', '4',  //
+    '6', '5', '6', '6', '6', '7', '6', '8', '6', '9',  //
+    '7', '0', '7', '1', '7', '2', '7', '3', '7', '4',  //
+    '7', '5', '7', '6', '7', '7', '7', '8', '7', '9',  //
+    '8', '0', '8', '1', '8', '2', '8', '3', '8', '4',  //
+    '8', '5', '8', '6', '8', '7', '8', '8', '8', '9',  //
+    '9', '0', '9', '1', '9', '2', '9', '3', '9', '4',  //
+    '9', '5', '9', '6', '9', '7', '9', '8', '9', '9',  //
+};
+
+static size_t  //
+wuffs_base__private_implementation__render_number_u64(wuffs_base__slice_u8 dst,
+                                                      uint64_t x,
+                                                      uint32_t options,
+                                                      bool neg) {
+  uint8_t buf[WUFFS_BASE__U64__BYTE_LENGTH__MAX_INCL];
+  uint8_t* ptr = &buf[0] + sizeof(buf);
+
+  while (x >= 100) {
+    size_t index = ((size_t)((x % 100) * 2));
+    x /= 100;
+    uint8_t s0 = wuffs_base__render_number__first_hundred[index + 0];
+    uint8_t s1 = wuffs_base__render_number__first_hundred[index + 1];
+    ptr -= 2;
+    ptr[0] = s0;
+    ptr[1] = s1;
+  }
+
+  if (x < 10) {
+    ptr -= 1;
+    ptr[0] = (uint8_t)('0' + x);
+  } else {
+    size_t index = ((size_t)(x * 2));
+    uint8_t s0 = wuffs_base__render_number__first_hundred[index + 0];
+    uint8_t s1 = wuffs_base__render_number__first_hundred[index + 1];
+    ptr -= 2;
+    ptr[0] = s0;
+    ptr[1] = s1;
+  }
+
+  if (neg) {
+    ptr -= 1;
+    ptr[0] = '-';
+  } else if (options & WUFFS_BASE__RENDER_NUMBER_XXX__LEADING_PLUS_SIGN) {
+    ptr -= 1;
+    ptr[0] = '+';
+  }
+
+  size_t n = sizeof(buf) - ((size_t)(ptr - &buf[0]));
+  if (n > dst.len) {
+    return 0;
+  }
+  memcpy(dst.ptr + ((options & WUFFS_BASE__RENDER_NUMBER_XXX__ALIGN_RIGHT)
+                        ? (dst.len - n)
+                        : 0),
+         ptr, n);
+  return n;
+}
+
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__render_number_i64(wuffs_base__slice_u8 dst,
+                              int64_t x,
+                              uint32_t options) {
+  uint64_t u = (uint64_t)x;
+  bool neg = x < 0;
+  if (neg) {
+    u = 1 + ~u;
+  }
+  return wuffs_base__private_implementation__render_number_u64(dst, u, options,
+                                                               neg);
+}
+
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__render_number_u64(wuffs_base__slice_u8 dst,
+                              uint64_t x,
+                              uint32_t options) {
+  return wuffs_base__private_implementation__render_number_u64(dst, x, options,
+                                                               false);
+}
+
+// ---------------- Base-16
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_16__decode2(wuffs_base__slice_u8 dst,
+                             wuffs_base__slice_u8 src,
+                             bool src_closed,
+                             uint32_t options) {
+  wuffs_base__transform__output o;
+  size_t src_len2 = src.len / 2;
+  size_t len;
+  if (dst.len < src_len2) {
+    len = dst.len;
+    o.status.repr = wuffs_base__suspension__short_write;
+  } else {
+    len = src_len2;
+    if (!src_closed) {
+      o.status.repr = wuffs_base__suspension__short_read;
+    } else if (src.len & 1) {
+      o.status.repr = wuffs_base__error__bad_data;
+    } else {
+      o.status.repr = NULL;
+    }
+  }
+
+  uint8_t* d = dst.ptr;
+  uint8_t* s = src.ptr;
+  size_t n = len;
+
+  while (n--) {
+    *d = (uint8_t)((wuffs_base__parse_number__hexadecimal_digits[s[0]] << 4) |
+                   (wuffs_base__parse_number__hexadecimal_digits[s[1]] & 0x0F));
+    d += 1;
+    s += 2;
+  }
+
+  o.num_dst = len;
+  o.num_src = len * 2;
+  return o;
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_16__decode4(wuffs_base__slice_u8 dst,
+                             wuffs_base__slice_u8 src,
+                             bool src_closed,
+                             uint32_t options) {
+  wuffs_base__transform__output o;
+  size_t src_len4 = src.len / 4;
+  size_t len = dst.len < src_len4 ? dst.len : src_len4;
+  if (dst.len < src_len4) {
+    len = dst.len;
+    o.status.repr = wuffs_base__suspension__short_write;
+  } else {
+    len = src_len4;
+    if (!src_closed) {
+      o.status.repr = wuffs_base__suspension__short_read;
+    } else if (src.len & 1) {
+      o.status.repr = wuffs_base__error__bad_data;
+    } else {
+      o.status.repr = NULL;
+    }
+  }
+
+  uint8_t* d = dst.ptr;
+  uint8_t* s = src.ptr;
+  size_t n = len;
+
+  while (n--) {
+    *d = (uint8_t)((wuffs_base__parse_number__hexadecimal_digits[s[2]] << 4) |
+                   (wuffs_base__parse_number__hexadecimal_digits[s[3]] & 0x0F));
+    d += 1;
+    s += 4;
+  }
+
+  o.num_dst = len;
+  o.num_src = len * 4;
+  return o;
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_16__encode2(wuffs_base__slice_u8 dst,
+                             wuffs_base__slice_u8 src,
+                             bool src_closed,
+                             uint32_t options) {
+  wuffs_base__transform__output o;
+  size_t dst_len2 = dst.len / 2;
+  size_t len;
+  if (dst_len2 < src.len) {
+    len = dst_len2;
+    o.status.repr = wuffs_base__suspension__short_write;
+  } else {
+    len = src.len;
+    if (!src_closed) {
+      o.status.repr = wuffs_base__suspension__short_read;
+    } else {
+      o.status.repr = NULL;
+    }
+  }
+
+  uint8_t* d = dst.ptr;
+  uint8_t* s = src.ptr;
+  size_t n = len;
+
+  while (n--) {
+    uint8_t c = *s;
+    d[0] = wuffs_base__private_implementation__encode_base16[c >> 4];
+    d[1] = wuffs_base__private_implementation__encode_base16[c & 0x0F];
+    d += 2;
+    s += 1;
+  }
+
+  o.num_dst = len * 2;
+  o.num_src = len;
+  return o;
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_16__encode4(wuffs_base__slice_u8 dst,
+                             wuffs_base__slice_u8 src,
+                             bool src_closed,
+                             uint32_t options) {
+  wuffs_base__transform__output o;
+  size_t dst_len4 = dst.len / 4;
+  size_t len;
+  if (dst_len4 < src.len) {
+    len = dst_len4;
+    o.status.repr = wuffs_base__suspension__short_write;
+  } else {
+    len = src.len;
+    if (!src_closed) {
+      o.status.repr = wuffs_base__suspension__short_read;
+    } else {
+      o.status.repr = NULL;
+    }
+  }
+
+  uint8_t* d = dst.ptr;
+  uint8_t* s = src.ptr;
+  size_t n = len;
+
+  while (n--) {
+    uint8_t c = *s;
+    d[0] = '\\';
+    d[1] = 'x';
+    d[2] = wuffs_base__private_implementation__encode_base16[c >> 4];
+    d[3] = wuffs_base__private_implementation__encode_base16[c & 0x0F];
+    d += 4;
+    s += 1;
+  }
+
+  o.num_dst = len * 4;
+  o.num_src = len;
+  return o;
+}
+
+// ---------------- Base-64
+
+// The two base-64 alphabets, std and url, differ only in the last two codes.
+//  - std: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
+//  - url: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
+
+static const uint8_t wuffs_base__base_64__decode_std[256] = {
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x00 ..= 0x07.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x08 ..= 0x0F.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x10 ..= 0x17.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x18 ..= 0x1F.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x20 ..= 0x27.
+    0x80, 0x80, 0x80, 0x3E, 0x80, 0x80, 0x80, 0x3F,  // 0x28 ..= 0x2F.
+    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,  // 0x30 ..= 0x37.
+    0x3C, 0x3D, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x38 ..= 0x3F.
+
+    0x80, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,  // 0x40 ..= 0x47.
+    0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,  // 0x48 ..= 0x4F.
+    0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,  // 0x50 ..= 0x57.
+    0x17, 0x18, 0x19, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x58 ..= 0x5F.
+    0x80, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,  // 0x60 ..= 0x67.
+    0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,  // 0x68 ..= 0x6F.
+    0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,  // 0x70 ..= 0x77.
+    0x31, 0x32, 0x33, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x78 ..= 0x7F.
+
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x80 ..= 0x87.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x88 ..= 0x8F.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x90 ..= 0x97.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x98 ..= 0x9F.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xA0 ..= 0xA7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xA8 ..= 0xAF.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xB0 ..= 0xB7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xB8 ..= 0xBF.
+
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xC0 ..= 0xC7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xC8 ..= 0xCF.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xD0 ..= 0xD7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xD8 ..= 0xDF.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xE0 ..= 0xE7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xE8 ..= 0xEF.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xF0 ..= 0xF7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xF8 ..= 0xFF.
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+};
+
+static const uint8_t wuffs_base__base_64__decode_url[256] = {
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x00 ..= 0x07.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x08 ..= 0x0F.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x10 ..= 0x17.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x18 ..= 0x1F.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x20 ..= 0x27.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x3E, 0x80, 0x80,  // 0x28 ..= 0x2F.
+    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,  // 0x30 ..= 0x37.
+    0x3C, 0x3D, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x38 ..= 0x3F.
+
+    0x80, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,  // 0x40 ..= 0x47.
+    0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,  // 0x48 ..= 0x4F.
+    0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,  // 0x50 ..= 0x57.
+    0x17, 0x18, 0x19, 0x80, 0x80, 0x80, 0x80, 0x3F,  // 0x58 ..= 0x5F.
+    0x80, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,  // 0x60 ..= 0x67.
+    0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,  // 0x68 ..= 0x6F.
+    0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,  // 0x70 ..= 0x77.
+    0x31, 0x32, 0x33, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x78 ..= 0x7F.
+
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x80 ..= 0x87.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x88 ..= 0x8F.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x90 ..= 0x97.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0x98 ..= 0x9F.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xA0 ..= 0xA7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xA8 ..= 0xAF.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xB0 ..= 0xB7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xB8 ..= 0xBF.
+
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xC0 ..= 0xC7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xC8 ..= 0xCF.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xD0 ..= 0xD7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xD8 ..= 0xDF.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xE0 ..= 0xE7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xE8 ..= 0xEF.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xF0 ..= 0xF7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xF8 ..= 0xFF.
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+};
+
+static const uint8_t wuffs_base__base_64__encode_std[64] = {
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+    0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,  // 0x00 ..= 0x07.
+    0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,  // 0x08 ..= 0x0F.
+    0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,  // 0x10 ..= 0x17.
+    0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,  // 0x18 ..= 0x1F.
+    0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E,  // 0x20 ..= 0x27.
+    0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,  // 0x28 ..= 0x2F.
+    0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33,  // 0x30 ..= 0x37.
+    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2B, 0x2F,  // 0x38 ..= 0x3F.
+};
+
+static const uint8_t wuffs_base__base_64__encode_url[64] = {
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+    0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,  // 0x00 ..= 0x07.
+    0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,  // 0x08 ..= 0x0F.
+    0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,  // 0x10 ..= 0x17.
+    0x59, 0x5A, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,  // 0x18 ..= 0x1F.
+    0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E,  // 0x20 ..= 0x27.
+    0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76,  // 0x28 ..= 0x2F.
+    0x77, 0x78, 0x79, 0x7A, 0x30, 0x31, 0x32, 0x33,  // 0x30 ..= 0x37.
+    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x2D, 0x5F,  // 0x38 ..= 0x3F.
+};
+
+// --------
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_64__decode(wuffs_base__slice_u8 dst,
+                            wuffs_base__slice_u8 src,
+                            bool src_closed,
+                            uint32_t options) {
+  const uint8_t* alphabet = (options & WUFFS_BASE__BASE_64__URL_ALPHABET)
+                                ? wuffs_base__base_64__decode_url
+                                : wuffs_base__base_64__decode_std;
+  wuffs_base__transform__output o;
+  uint8_t* d_ptr = dst.ptr;
+  size_t d_len = dst.len;
+  const uint8_t* s_ptr = src.ptr;
+  size_t s_len = src.len;
+  bool pad = false;
+
+  while (s_len >= 4) {
+    uint32_t s = wuffs_base__peek_u32le__no_bounds_check(s_ptr);
+    uint32_t s0 = alphabet[0xFF & (s >> 0)];
+    uint32_t s1 = alphabet[0xFF & (s >> 8)];
+    uint32_t s2 = alphabet[0xFF & (s >> 16)];
+    uint32_t s3 = alphabet[0xFF & (s >> 24)];
+
+    if (((s0 | s1 | s2 | s3) & 0xC0) != 0) {
+      if (s_len > 4) {
+        o.status.repr = wuffs_base__error__bad_data;
+        goto done;
+      } else if (!src_closed) {
+        o.status.repr = wuffs_base__suspension__short_read;
+        goto done;
+      } else if ((options & WUFFS_BASE__BASE_64__DECODE_ALLOW_PADDING) &&
+                 (s_ptr[3] == '=')) {
+        pad = true;
+        if (s_ptr[2] == '=') {
+          goto src2;
+        }
+        goto src3;
+      }
+      o.status.repr = wuffs_base__error__bad_data;
+      goto done;
+    }
+
+    if (d_len < 3) {
+      o.status.repr = wuffs_base__suspension__short_write;
+      goto done;
+    }
+
+    s_ptr += 4;
+    s_len -= 4;
+    s = (s0 << 18) | (s1 << 12) | (s2 << 6) | (s3 << 0);
+    *d_ptr++ = (uint8_t)(s >> 16);
+    *d_ptr++ = (uint8_t)(s >> 8);
+    *d_ptr++ = (uint8_t)(s >> 0);
+    d_len -= 3;
+  }
+
+  if (!src_closed) {
+    o.status.repr = wuffs_base__suspension__short_read;
+    goto done;
+  }
+
+  if (s_len == 0) {
+    o.status.repr = NULL;
+    goto done;
+  } else if (s_len == 1) {
+    o.status.repr = wuffs_base__error__bad_data;
+    goto done;
+  } else if (s_len == 2) {
+    goto src2;
+  }
+
+src3:
+  do {
+    uint32_t s = wuffs_base__peek_u24le__no_bounds_check(s_ptr);
+    uint32_t s0 = alphabet[0xFF & (s >> 0)];
+    uint32_t s1 = alphabet[0xFF & (s >> 8)];
+    uint32_t s2 = alphabet[0xFF & (s >> 16)];
+    if ((s0 & 0xC0) || (s1 & 0xC0) || (s2 & 0xC3)) {
+      o.status.repr = wuffs_base__error__bad_data;
+      goto done;
+    }
+    if (d_len < 2) {
+      o.status.repr = wuffs_base__suspension__short_write;
+      goto done;
+    }
+    s_ptr += pad ? 4 : 3;
+    s = (s0 << 18) | (s1 << 12) | (s2 << 6);
+    *d_ptr++ = (uint8_t)(s >> 16);
+    *d_ptr++ = (uint8_t)(s >> 8);
+    o.status.repr = NULL;
+    goto done;
+  } while (0);
+
+src2:
+  do {
+    uint32_t s = wuffs_base__peek_u16le__no_bounds_check(s_ptr);
+    uint32_t s0 = alphabet[0xFF & (s >> 0)];
+    uint32_t s1 = alphabet[0xFF & (s >> 8)];
+    if ((s0 & 0xC0) || (s1 & 0xCF)) {
+      o.status.repr = wuffs_base__error__bad_data;
+      goto done;
+    }
+    if (d_len < 1) {
+      o.status.repr = wuffs_base__suspension__short_write;
+      goto done;
+    }
+    s_ptr += pad ? 4 : 2;
+    s = (s0 << 18) | (s1 << 12);
+    *d_ptr++ = (uint8_t)(s >> 16);
+    o.status.repr = NULL;
+    goto done;
+  } while (0);
+
+done:
+  o.num_dst = (size_t)(d_ptr - dst.ptr);
+  o.num_src = (size_t)(s_ptr - src.ptr);
+  return o;
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__transform__output  //
+wuffs_base__base_64__encode(wuffs_base__slice_u8 dst,
+                            wuffs_base__slice_u8 src,
+                            bool src_closed,
+                            uint32_t options) {
+  const uint8_t* alphabet = (options & WUFFS_BASE__BASE_64__URL_ALPHABET)
+                                ? wuffs_base__base_64__encode_url
+                                : wuffs_base__base_64__encode_std;
+  wuffs_base__transform__output o;
+  uint8_t* d_ptr = dst.ptr;
+  size_t d_len = dst.len;
+  const uint8_t* s_ptr = src.ptr;
+  size_t s_len = src.len;
+
+  do {
+    while (s_len >= 3) {
+      if (d_len < 4) {
+        o.status.repr = wuffs_base__suspension__short_write;
+        goto done;
+      }
+      uint32_t s = wuffs_base__peek_u24be__no_bounds_check(s_ptr);
+      s_ptr += 3;
+      s_len -= 3;
+      *d_ptr++ = alphabet[0x3F & (s >> 18)];
+      *d_ptr++ = alphabet[0x3F & (s >> 12)];
+      *d_ptr++ = alphabet[0x3F & (s >> 6)];
+      *d_ptr++ = alphabet[0x3F & (s >> 0)];
+      d_len -= 4;
+    }
+
+    if (!src_closed) {
+      o.status.repr = wuffs_base__suspension__short_read;
+      goto done;
+    }
+
+    if (s_len == 2) {
+      if (d_len <
+          ((options & WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING) ? 4 : 3)) {
+        o.status.repr = wuffs_base__suspension__short_write;
+        goto done;
+      }
+      uint32_t s = ((uint32_t)(wuffs_base__peek_u16be__no_bounds_check(s_ptr)))
+                   << 8;
+      s_ptr += 2;
+      *d_ptr++ = alphabet[0x3F & (s >> 18)];
+      *d_ptr++ = alphabet[0x3F & (s >> 12)];
+      *d_ptr++ = alphabet[0x3F & (s >> 6)];
+      if (options & WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING) {
+        *d_ptr++ = '=';
+      }
+      o.status.repr = NULL;
+      goto done;
+
+    } else if (s_len == 1) {
+      if (d_len <
+          ((options & WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING) ? 4 : 2)) {
+        o.status.repr = wuffs_base__suspension__short_write;
+        goto done;
+      }
+      uint32_t s = ((uint32_t)(wuffs_base__peek_u8__no_bounds_check(s_ptr)))
+                   << 16;
+      s_ptr += 1;
+      *d_ptr++ = alphabet[0x3F & (s >> 18)];
+      *d_ptr++ = alphabet[0x3F & (s >> 12)];
+      if (options & WUFFS_BASE__BASE_64__ENCODE_EMIT_PADDING) {
+        *d_ptr++ = '=';
+        *d_ptr++ = '=';
+      }
+      o.status.repr = NULL;
+      goto done;
+
+    } else {
+      o.status.repr = NULL;
+      goto done;
+    }
+  } while (0);
+
+done:
+  o.num_dst = (size_t)(d_ptr - dst.ptr);
+  o.num_src = (size_t)(s_ptr - src.ptr);
+  return o;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE__INTCONV)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
+    defined(WUFFS_CONFIG__MODULE__BASE__MAGIC)
+
+// ---------------- Magic Numbers
+
+WUFFS_BASE__MAYBE_STATIC int32_t  //
+wuffs_base__magic_number_guess_fourcc(wuffs_base__slice_u8 prefix) {
+  // table holds the 'magic numbers' (which are actually variable length
+  // strings). The strings may contain NUL bytes, so the "const char* magic"
+  // value starts with the length-minus-1 of the 'magic number'.
+  //
+  // Keep it sorted by magic[1], then magic[0] descending and finally by
+  // magic[2:]. When multiple entries match, the longest one wins.
+  //
+  // The fourcc field might be negated, in which case there's further
+  // specialization (see § below).
+  static struct {
+    int32_t fourcc;
+    const char* magic;
+  } table[] = {
+      {-0x30302020, "\x01\x00\x00"},          // '00  'be
+      {+0x424D5020, "\x01\x42\x4D"},          // BMP
+      {+0x47494620, "\x03\x47\x49\x46\x38"},  // GIF
+      {+0x54494646, "\x03\x49\x49\x2A\x00"},  // TIFF (little-endian)
+      {+0x54494646, "\x03\x4D\x4D\x00\x2A"},  // TIFF (big-endian)
+      {-0x52494646, "\x03\x52\x49\x46\x46"},  // RIFF
+      {+0x4E494520, "\x02\x6E\xC3\xAF"},      // NIE
+      {+0x504E4720, "\x03\x89\x50\x4E\x47"},  // PNG
+      {+0x4A504547, "\x01\xFF\xD8"},          // JPEG
+  };
+  static const size_t table_len = sizeof(table) / sizeof(table[0]);
+
+  if (prefix.len == 0) {
+    return -1;
+  }
+  uint8_t pre_first_byte = prefix.ptr[0];
+
+  int32_t fourcc = 0;
+  size_t i;
+  for (i = 0; i < table_len; i++) {
+    uint8_t mag_first_byte = ((uint8_t)(table[i].magic[1]));
+    if (pre_first_byte < mag_first_byte) {
+      break;
+    } else if (pre_first_byte > mag_first_byte) {
+      continue;
+    }
+    fourcc = table[i].fourcc;
+
+    uint8_t mag_remaining_len = ((uint8_t)(table[i].magic[0]));
+    if (mag_remaining_len == 0) {
+      goto match;
+    }
+
+    const char* mag_remaining_ptr = table[i].magic + 2;
+    uint8_t* pre_remaining_ptr = prefix.ptr + 1;
+    size_t pre_remaining_len = prefix.len - 1;
+    if (pre_remaining_len < mag_remaining_len) {
+      if (!memcmp(pre_remaining_ptr, mag_remaining_ptr, pre_remaining_len)) {
+        return -1;
+      }
+    } else {
+      if (!memcmp(pre_remaining_ptr, mag_remaining_ptr, mag_remaining_len)) {
+        goto match;
+      }
+    }
+  }
+  return 0;
+
+match:
+  // Negative FourCC values (see § above) are further specialized.
+  if (fourcc < 0) {
+    fourcc = -fourcc;
+
+    if (fourcc == 0x52494646) {  // 'RIFF'be
+      if (prefix.len < 16) {
+        return -1;
+      }
+      uint32_t x = wuffs_base__peek_u32be__no_bounds_check(prefix.ptr + 8);
+      if (x == 0x57454250) {  // 'WEBP'be
+        uint32_t y = wuffs_base__peek_u32be__no_bounds_check(prefix.ptr + 12);
+        if (y == 0x56503820) {         // 'VP8 'be
+          return 0x57503820;           // 'WP8 'be
+        } else if (y == 0x5650384C) {  // 'VP8L'be
+          return 0x5750384C;           // 'WP8L'be
+        }
+      }
+
+    } else if (fourcc == 0x30302020) {  // '00  'be
+      // Binary data starting with multiple 0x00 NUL bytes is quite common.
+      if (prefix.len < 4) {
+        return -1;
+      } else if ((prefix.ptr[2] != 0x00) &&
+                 ((prefix.ptr[2] >= 0x80) || (prefix.ptr[3] != 0x00))) {
+        // Roughly speaking, this could be a non-degenerate (non-0-width and
+        // non-0-height) WBMP image.
+        return 0x57424D50;  // 'WBMP'be
+      } else if (((prefix.ptr[2] == 0x01) || (prefix.ptr[2] == 0x02)) &&
+                 (prefix.ptr[3] == 0x00)) {
+        return 0x49434F20;  // 'ICO 'be
+      }
+      return 0;
+    }
+  }
+  return fourcc;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE__MAGIC)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
+    defined(WUFFS_CONFIG__MODULE__BASE__PIXCONV)
+
+// ---------------- Pixel Swizzler
+
+static inline uint32_t  //
+wuffs_base__swap_u32_argb_abgr(uint32_t u) {
+  uint32_t o = u & 0xFF00FF00ul;
+  uint32_t r = u & 0x00FF0000ul;
+  uint32_t b = u & 0x000000FFul;
+  return o | (r >> 16) | (b << 16);
+}
+
+static inline uint64_t  //
+wuffs_base__swap_u64_argb_abgr(uint64_t u) {
+  uint64_t o = u & 0xFFFF0000FFFF0000ull;
+  uint64_t r = u & 0x0000FFFF00000000ull;
+  uint64_t b = u & 0x000000000000FFFFull;
+  return o | (r >> 32) | (b << 32);
+}
+
+static inline uint32_t  //
+wuffs_base__color_u64__as__color_u32__swap_u32_argb_abgr(uint64_t c) {
+  uint32_t a = ((uint32_t)(0xFF & (c >> 56)));
+  uint32_t r = ((uint32_t)(0xFF & (c >> 40)));
+  uint32_t g = ((uint32_t)(0xFF & (c >> 24)));
+  uint32_t b = ((uint32_t)(0xFF & (c >> 8)));
+  return (a << 24) | (b << 16) | (g << 8) | (r << 0);
+}
+
+// --------
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__color_u32_argb_premul  //
+wuffs_base__pixel_buffer__color_u32_at(const wuffs_base__pixel_buffer* pb,
+                                       uint32_t x,
+                                       uint32_t y) {
+  if (!pb || (x >= pb->pixcfg.private_impl.width) ||
+      (y >= pb->pixcfg.private_impl.height)) {
+    return 0;
+  }
+
+  if (wuffs_base__pixel_format__is_planar(&pb->pixcfg.private_impl.pixfmt)) {
+    // TODO: support planar formats.
+    return 0;
+  }
+
+  size_t stride = pb->private_impl.planes[0].stride;
+  const uint8_t* row = pb->private_impl.planes[0].ptr + (stride * ((size_t)y));
+
+  switch (pb->pixcfg.private_impl.pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+      return wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x)));
+
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY: {
+      uint8_t* palette = pb->private_impl.planes[3].ptr;
+      return wuffs_base__peek_u32le__no_bounds_check(palette +
+                                                     (4 * ((size_t)row[x])));
+    }
+
+      // Common formats above. Rarer formats below.
+
+    case WUFFS_BASE__PIXEL_FORMAT__Y:
+      return 0xFF000000 | (0x00010101 * ((uint32_t)(row[x])));
+    case WUFFS_BASE__PIXEL_FORMAT__Y_16LE:
+      return 0xFF000000 | (0x00010101 * ((uint32_t)(row[(2 * x) + 1])));
+    case WUFFS_BASE__PIXEL_FORMAT__Y_16BE:
+      return 0xFF000000 | (0x00010101 * ((uint32_t)(row[(2 * x) + 0])));
+
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL: {
+      uint8_t* palette = pb->private_impl.planes[3].ptr;
+      return wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
+          wuffs_base__peek_u32le__no_bounds_check(palette +
+                                                  (4 * ((size_t)row[x]))));
+    }
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      return wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(
+          wuffs_base__peek_u16le__no_bounds_check(row + (2 * ((size_t)x))));
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      return 0xFF000000 |
+             wuffs_base__peek_u24le__no_bounds_check(row + (3 * ((size_t)x)));
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      return wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
+          wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x))));
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      return wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(
+          wuffs_base__peek_u64le__no_bounds_check(row + (8 * ((size_t)x))));
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+      return 0xFF000000 |
+             wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x)));
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      return wuffs_base__swap_u32_argb_abgr(
+          0xFF000000 |
+          wuffs_base__peek_u24le__no_bounds_check(row + (3 * ((size_t)x))));
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      return wuffs_base__swap_u32_argb_abgr(
+          wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
+              wuffs_base__peek_u32le__no_bounds_check(row +
+                                                      (4 * ((size_t)x)))));
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+      return wuffs_base__swap_u32_argb_abgr(
+          wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x))));
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      return wuffs_base__swap_u32_argb_abgr(
+          0xFF000000 |
+          wuffs_base__peek_u32le__no_bounds_check(row + (4 * ((size_t)x))));
+
+    default:
+      // TODO: support more formats.
+      break;
+  }
+
+  return 0;
+}
+
+// --------
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_base__pixel_buffer__set_color_u32_at(
+    wuffs_base__pixel_buffer* pb,
+    uint32_t x,
+    uint32_t y,
+    wuffs_base__color_u32_argb_premul color) {
+  if (!pb) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if ((x >= pb->pixcfg.private_impl.width) ||
+      (y >= pb->pixcfg.private_impl.height)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+
+  if (wuffs_base__pixel_format__is_planar(&pb->pixcfg.private_impl.pixfmt)) {
+    // TODO: support planar formats.
+    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
+  }
+
+  size_t stride = pb->private_impl.planes[0].stride;
+  uint8_t* row = pb->private_impl.planes[0].ptr + (stride * ((size_t)y));
+
+  switch (pb->pixcfg.private_impl.pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+      wuffs_base__poke_u32le__no_bounds_check(row + (4 * ((size_t)x)), color);
+      break;
+
+      // Common formats above. Rarer formats below.
+
+    case WUFFS_BASE__PIXEL_FORMAT__Y:
+      wuffs_base__poke_u8__no_bounds_check(
+          row + ((size_t)x),
+          wuffs_base__color_u32_argb_premul__as__color_u8_gray(color));
+      break;
+    case WUFFS_BASE__PIXEL_FORMAT__Y_16LE:
+      wuffs_base__poke_u16le__no_bounds_check(
+          row + (2 * ((size_t)x)),
+          wuffs_base__color_u32_argb_premul__as__color_u16_gray(color));
+      break;
+    case WUFFS_BASE__PIXEL_FORMAT__Y_16BE:
+      wuffs_base__poke_u16be__no_bounds_check(
+          row + (2 * ((size_t)x)),
+          wuffs_base__color_u32_argb_premul__as__color_u16_gray(color));
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
+      wuffs_base__poke_u8__no_bounds_check(
+          row + ((size_t)x), wuffs_base__pixel_palette__closest_element(
+                                 wuffs_base__pixel_buffer__palette(pb),
+                                 pb->pixcfg.private_impl.pixfmt, color));
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      wuffs_base__poke_u16le__no_bounds_check(
+          row + (2 * ((size_t)x)),
+          wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(color));
+      break;
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      wuffs_base__poke_u24le__no_bounds_check(row + (3 * ((size_t)x)), color);
+      break;
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      wuffs_base__poke_u32le__no_bounds_check(
+          row + (4 * ((size_t)x)),
+          wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
+              color));
+      break;
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      wuffs_base__poke_u64le__no_bounds_check(
+          row + (8 * ((size_t)x)),
+          wuffs_base__color_u32_argb_premul__as__color_u64_argb_nonpremul(
+              color));
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      wuffs_base__poke_u24le__no_bounds_check(
+          row + (3 * ((size_t)x)), wuffs_base__swap_u32_argb_abgr(color));
+      break;
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      wuffs_base__poke_u32le__no_bounds_check(
+          row + (4 * ((size_t)x)),
+          wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
+              wuffs_base__swap_u32_argb_abgr(color)));
+      break;
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      wuffs_base__poke_u32le__no_bounds_check(
+          row + (4 * ((size_t)x)), wuffs_base__swap_u32_argb_abgr(color));
+      break;
+
+    default:
+      // TODO: support more formats.
+      return wuffs_base__make_status(wuffs_base__error__unsupported_option);
+  }
+
+  return wuffs_base__make_status(NULL);
+}
+
+// --------
+
+static inline void  //
+wuffs_base__pixel_buffer__set_color_u32_fill_rect__xx(
+    wuffs_base__pixel_buffer* pb,
+    wuffs_base__rect_ie_u32 rect,
+    uint16_t color) {
+  size_t stride = pb->private_impl.planes[0].stride;
+  uint32_t width = wuffs_base__rect_ie_u32__width(&rect);
+  if ((stride == (2 * ((uint64_t)width))) && (rect.min_incl_x == 0)) {
+    uint8_t* ptr =
+        pb->private_impl.planes[0].ptr + (stride * ((size_t)rect.min_incl_y));
+    uint32_t height = wuffs_base__rect_ie_u32__height(&rect);
+    size_t n;
+    for (n = ((size_t)width) * ((size_t)height); n > 0; n--) {
+      wuffs_base__poke_u16le__no_bounds_check(ptr, color);
+      ptr += 2;
+    }
+    return;
+  }
+
+  uint32_t y;
+  for (y = rect.min_incl_y; y < rect.max_excl_y; y++) {
+    uint8_t* ptr = pb->private_impl.planes[0].ptr + (stride * ((size_t)y)) +
+                   (2 * ((size_t)rect.min_incl_x));
+    uint32_t n;
+    for (n = width; n > 0; n--) {
+      wuffs_base__poke_u16le__no_bounds_check(ptr, color);
+      ptr += 2;
+    }
+  }
+}
+
+static inline void  //
+wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxx(
+    wuffs_base__pixel_buffer* pb,
+    wuffs_base__rect_ie_u32 rect,
+    uint32_t color) {
+  size_t stride = pb->private_impl.planes[0].stride;
+  uint32_t width = wuffs_base__rect_ie_u32__width(&rect);
+  if ((stride == (3 * ((uint64_t)width))) && (rect.min_incl_x == 0)) {
+    uint8_t* ptr =
+        pb->private_impl.planes[0].ptr + (stride * ((size_t)rect.min_incl_y));
+    uint32_t height = wuffs_base__rect_ie_u32__height(&rect);
+    size_t n;
+    for (n = ((size_t)width) * ((size_t)height); n > 0; n--) {
+      wuffs_base__poke_u24le__no_bounds_check(ptr, color);
+      ptr += 3;
+    }
+    return;
+  }
+
+  uint32_t y;
+  for (y = rect.min_incl_y; y < rect.max_excl_y; y++) {
+    uint8_t* ptr = pb->private_impl.planes[0].ptr + (stride * ((size_t)y)) +
+                   (3 * ((size_t)rect.min_incl_x));
+    uint32_t n;
+    for (n = width; n > 0; n--) {
+      wuffs_base__poke_u24le__no_bounds_check(ptr, color);
+      ptr += 3;
+    }
+  }
+}
+
+static inline void  //
+wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxx(
+    wuffs_base__pixel_buffer* pb,
+    wuffs_base__rect_ie_u32 rect,
+    uint32_t color) {
+  size_t stride = pb->private_impl.planes[0].stride;
+  uint32_t width = wuffs_base__rect_ie_u32__width(&rect);
+  if ((stride == (4 * ((uint64_t)width))) && (rect.min_incl_x == 0)) {
+    uint8_t* ptr =
+        pb->private_impl.planes[0].ptr + (stride * ((size_t)rect.min_incl_y));
+    uint32_t height = wuffs_base__rect_ie_u32__height(&rect);
+    size_t n;
+    for (n = ((size_t)width) * ((size_t)height); n > 0; n--) {
+      wuffs_base__poke_u32le__no_bounds_check(ptr, color);
+      ptr += 4;
+    }
+    return;
+  }
+
+  uint32_t y;
+  for (y = rect.min_incl_y; y < rect.max_excl_y; y++) {
+    uint8_t* ptr = pb->private_impl.planes[0].ptr + (stride * ((size_t)y)) +
+                   (4 * ((size_t)rect.min_incl_x));
+    uint32_t n;
+    for (n = width; n > 0; n--) {
+      wuffs_base__poke_u32le__no_bounds_check(ptr, color);
+      ptr += 4;
+    }
+  }
+}
+
+static inline void  //
+wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxxxxxx(
+    wuffs_base__pixel_buffer* pb,
+    wuffs_base__rect_ie_u32 rect,
+    uint64_t color) {
+  size_t stride = pb->private_impl.planes[0].stride;
+  uint32_t width = wuffs_base__rect_ie_u32__width(&rect);
+  if ((stride == (8 * ((uint64_t)width))) && (rect.min_incl_x == 0)) {
+    uint8_t* ptr =
+        pb->private_impl.planes[0].ptr + (stride * ((size_t)rect.min_incl_y));
+    uint32_t height = wuffs_base__rect_ie_u32__height(&rect);
+    size_t n;
+    for (n = ((size_t)width) * ((size_t)height); n > 0; n--) {
+      wuffs_base__poke_u64le__no_bounds_check(ptr, color);
+      ptr += 8;
+    }
+    return;
+  }
+
+  uint32_t y;
+  for (y = rect.min_incl_y; y < rect.max_excl_y; y++) {
+    uint8_t* ptr = pb->private_impl.planes[0].ptr + (stride * ((size_t)y)) +
+                   (8 * ((size_t)rect.min_incl_x));
+    uint32_t n;
+    for (n = width; n > 0; n--) {
+      wuffs_base__poke_u64le__no_bounds_check(ptr, color);
+      ptr += 8;
+    }
+  }
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_base__pixel_buffer__set_color_u32_fill_rect(
+    wuffs_base__pixel_buffer* pb,
+    wuffs_base__rect_ie_u32 rect,
+    wuffs_base__color_u32_argb_premul color) {
+  if (!pb) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  } else if (wuffs_base__rect_ie_u32__is_empty(&rect)) {
+    return wuffs_base__make_status(NULL);
+  }
+  wuffs_base__rect_ie_u32 bounds =
+      wuffs_base__pixel_config__bounds(&pb->pixcfg);
+  if (!wuffs_base__rect_ie_u32__contains_rect(&bounds, rect)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+
+  if (wuffs_base__pixel_format__is_planar(&pb->pixcfg.private_impl.pixfmt)) {
+    // TODO: support planar formats.
+    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
+  }
+
+  switch (pb->pixcfg.private_impl.pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+      wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxx(pb, rect, color);
+      return wuffs_base__make_status(NULL);
+
+      // Common formats above. Rarer formats below.
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      wuffs_base__pixel_buffer__set_color_u32_fill_rect__xx(
+          pb, rect,
+          wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(color));
+      return wuffs_base__make_status(NULL);
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxx(pb, rect, color);
+      return wuffs_base__make_status(NULL);
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxx(
+          pb, rect,
+          wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
+              color));
+      return wuffs_base__make_status(NULL);
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxxxxxx(
+          pb, rect,
+          wuffs_base__color_u32_argb_premul__as__color_u64_argb_nonpremul(
+              color));
+      return wuffs_base__make_status(NULL);
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxx(
+          pb, rect,
+          wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
+              wuffs_base__swap_u32_argb_abgr(color)));
+      return wuffs_base__make_status(NULL);
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      wuffs_base__pixel_buffer__set_color_u32_fill_rect__xxxx(
+          pb, rect, wuffs_base__swap_u32_argb_abgr(color));
+      return wuffs_base__make_status(NULL);
+  }
+
+  uint32_t y;
+  for (y = rect.min_incl_y; y < rect.max_excl_y; y++) {
+    uint32_t x;
+    for (x = rect.min_incl_x; x < rect.max_excl_x; x++) {
+      wuffs_base__pixel_buffer__set_color_u32_at(pb, x, y, color);
+    }
+  }
+  return wuffs_base__make_status(NULL);
+}
+
+// --------
+
+WUFFS_BASE__MAYBE_STATIC uint8_t  //
+wuffs_base__pixel_palette__closest_element(
+    wuffs_base__slice_u8 palette_slice,
+    wuffs_base__pixel_format palette_format,
+    wuffs_base__color_u32_argb_premul c) {
+  size_t n = palette_slice.len / 4;
+  if (n > (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
+    n = (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4);
+  }
+  size_t best_index = 0;
+  uint64_t best_score = 0xFFFFFFFFFFFFFFFF;
+
+  // Work in 16-bit color.
+  uint32_t ca = 0x101 * (0xFF & (c >> 24));
+  uint32_t cr = 0x101 * (0xFF & (c >> 16));
+  uint32_t cg = 0x101 * (0xFF & (c >> 8));
+  uint32_t cb = 0x101 * (0xFF & (c >> 0));
+
+  switch (palette_format.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY: {
+      bool nonpremul = palette_format.repr ==
+                       WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL;
+
+      size_t i;
+      for (i = 0; i < n; i++) {
+        // Work in 16-bit color.
+        uint32_t pb = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 0]));
+        uint32_t pg = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 1]));
+        uint32_t pr = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 2]));
+        uint32_t pa = 0x101 * ((uint32_t)(palette_slice.ptr[(4 * i) + 3]));
+
+        // Convert to premultiplied alpha.
+        if (nonpremul && (pa != 0xFFFF)) {
+          pb = (pb * pa) / 0xFFFF;
+          pg = (pg * pa) / 0xFFFF;
+          pr = (pr * pa) / 0xFFFF;
+        }
+
+        // These deltas are conceptually int32_t (signed) but after squaring,
+        // it's equivalent to work in uint32_t (unsigned).
+        pb -= cb;
+        pg -= cg;
+        pr -= cr;
+        pa -= ca;
+        uint64_t score = ((uint64_t)(pb * pb)) + ((uint64_t)(pg * pg)) +
+                         ((uint64_t)(pr * pr)) + ((uint64_t)(pa * pa));
+        if (best_score > score) {
+          best_score = score;
+          best_index = i;
+        }
+      }
+      break;
+    }
+  }
+
+  return (uint8_t)best_index;
+}
+
+// --------
+
+static inline uint32_t  //
+wuffs_base__composite_nonpremul_nonpremul_u32_axxx(uint32_t dst_nonpremul,
+                                                   uint32_t src_nonpremul) {
+  // Extract 16-bit color components.
+  uint32_t sa = 0x101 * (0xFF & (src_nonpremul >> 24));
+  uint32_t sr = 0x101 * (0xFF & (src_nonpremul >> 16));
+  uint32_t sg = 0x101 * (0xFF & (src_nonpremul >> 8));
+  uint32_t sb = 0x101 * (0xFF & (src_nonpremul >> 0));
+  uint32_t da = 0x101 * (0xFF & (dst_nonpremul >> 24));
+  uint32_t dr = 0x101 * (0xFF & (dst_nonpremul >> 16));
+  uint32_t dg = 0x101 * (0xFF & (dst_nonpremul >> 8));
+  uint32_t db = 0x101 * (0xFF & (dst_nonpremul >> 0));
+
+  // Convert dst from nonpremul to premul.
+  dr = (dr * da) / 0xFFFF;
+  dg = (dg * da) / 0xFFFF;
+  db = (db * da) / 0xFFFF;
+
+  // Calculate the inverse of the src-alpha: how much of the dst to keep.
+  uint32_t ia = 0xFFFF - sa;
+
+  // Composite src (nonpremul) over dst (premul).
+  da = sa + ((da * ia) / 0xFFFF);
+  dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
+  dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
+  db = ((sb * sa) + (db * ia)) / 0xFFFF;
+
+  // Convert dst from premul to nonpremul.
+  if (da != 0) {
+    dr = (dr * 0xFFFF) / da;
+    dg = (dg * 0xFFFF) / da;
+    db = (db * 0xFFFF) / da;
+  }
+
+  // Convert from 16-bit color to 8-bit color.
+  da >>= 8;
+  dr >>= 8;
+  dg >>= 8;
+  db >>= 8;
+
+  // Combine components.
+  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
+}
+
+static inline uint64_t  //
+wuffs_base__composite_nonpremul_nonpremul_u64_axxx(uint64_t dst_nonpremul,
+                                                   uint64_t src_nonpremul) {
+  // Extract components.
+  uint64_t sa = 0xFFFF & (src_nonpremul >> 48);
+  uint64_t sr = 0xFFFF & (src_nonpremul >> 32);
+  uint64_t sg = 0xFFFF & (src_nonpremul >> 16);
+  uint64_t sb = 0xFFFF & (src_nonpremul >> 0);
+  uint64_t da = 0xFFFF & (dst_nonpremul >> 48);
+  uint64_t dr = 0xFFFF & (dst_nonpremul >> 32);
+  uint64_t dg = 0xFFFF & (dst_nonpremul >> 16);
+  uint64_t db = 0xFFFF & (dst_nonpremul >> 0);
+
+  // Convert dst from nonpremul to premul.
+  dr = (dr * da) / 0xFFFF;
+  dg = (dg * da) / 0xFFFF;
+  db = (db * da) / 0xFFFF;
+
+  // Calculate the inverse of the src-alpha: how much of the dst to keep.
+  uint64_t ia = 0xFFFF - sa;
+
+  // Composite src (nonpremul) over dst (premul).
+  da = sa + ((da * ia) / 0xFFFF);
+  dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
+  dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
+  db = ((sb * sa) + (db * ia)) / 0xFFFF;
+
+  // Convert dst from premul to nonpremul.
+  if (da != 0) {
+    dr = (dr * 0xFFFF) / da;
+    dg = (dg * 0xFFFF) / da;
+    db = (db * 0xFFFF) / da;
+  }
+
+  // Combine components.
+  return (db << 0) | (dg << 16) | (dr << 32) | (da << 48);
+}
+
+static inline uint32_t  //
+wuffs_base__composite_nonpremul_premul_u32_axxx(uint32_t dst_nonpremul,
+                                                uint32_t src_premul) {
+  // Extract 16-bit color components.
+  uint32_t sa = 0x101 * (0xFF & (src_premul >> 24));
+  uint32_t sr = 0x101 * (0xFF & (src_premul >> 16));
+  uint32_t sg = 0x101 * (0xFF & (src_premul >> 8));
+  uint32_t sb = 0x101 * (0xFF & (src_premul >> 0));
+  uint32_t da = 0x101 * (0xFF & (dst_nonpremul >> 24));
+  uint32_t dr = 0x101 * (0xFF & (dst_nonpremul >> 16));
+  uint32_t dg = 0x101 * (0xFF & (dst_nonpremul >> 8));
+  uint32_t db = 0x101 * (0xFF & (dst_nonpremul >> 0));
+
+  // Convert dst from nonpremul to premul.
+  dr = (dr * da) / 0xFFFF;
+  dg = (dg * da) / 0xFFFF;
+  db = (db * da) / 0xFFFF;
+
+  // Calculate the inverse of the src-alpha: how much of the dst to keep.
+  uint32_t ia = 0xFFFF - sa;
+
+  // Composite src (premul) over dst (premul).
+  da = sa + ((da * ia) / 0xFFFF);
+  dr = sr + ((dr * ia) / 0xFFFF);
+  dg = sg + ((dg * ia) / 0xFFFF);
+  db = sb + ((db * ia) / 0xFFFF);
+
+  // Convert dst from premul to nonpremul.
+  if (da != 0) {
+    dr = (dr * 0xFFFF) / da;
+    dg = (dg * 0xFFFF) / da;
+    db = (db * 0xFFFF) / da;
+  }
+
+  // Convert from 16-bit color to 8-bit color.
+  da >>= 8;
+  dr >>= 8;
+  dg >>= 8;
+  db >>= 8;
+
+  // Combine components.
+  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
+}
+
+static inline uint64_t  //
+wuffs_base__composite_nonpremul_premul_u64_axxx(uint64_t dst_nonpremul,
+                                                uint64_t src_premul) {
+  // Extract components.
+  uint64_t sa = 0xFFFF & (src_premul >> 48);
+  uint64_t sr = 0xFFFF & (src_premul >> 32);
+  uint64_t sg = 0xFFFF & (src_premul >> 16);
+  uint64_t sb = 0xFFFF & (src_premul >> 0);
+  uint64_t da = 0xFFFF & (dst_nonpremul >> 48);
+  uint64_t dr = 0xFFFF & (dst_nonpremul >> 32);
+  uint64_t dg = 0xFFFF & (dst_nonpremul >> 16);
+  uint64_t db = 0xFFFF & (dst_nonpremul >> 0);
+
+  // Convert dst from nonpremul to premul.
+  dr = (dr * da) / 0xFFFF;
+  dg = (dg * da) / 0xFFFF;
+  db = (db * da) / 0xFFFF;
+
+  // Calculate the inverse of the src-alpha: how much of the dst to keep.
+  uint64_t ia = 0xFFFF - sa;
+
+  // Composite src (premul) over dst (premul).
+  da = sa + ((da * ia) / 0xFFFF);
+  dr = sr + ((dr * ia) / 0xFFFF);
+  dg = sg + ((dg * ia) / 0xFFFF);
+  db = sb + ((db * ia) / 0xFFFF);
+
+  // Convert dst from premul to nonpremul.
+  if (da != 0) {
+    dr = (dr * 0xFFFF) / da;
+    dg = (dg * 0xFFFF) / da;
+    db = (db * 0xFFFF) / da;
+  }
+
+  // Combine components.
+  return (db << 0) | (dg << 16) | (dr << 32) | (da << 48);
+}
+
+static inline uint32_t  //
+wuffs_base__composite_premul_nonpremul_u32_axxx(uint32_t dst_premul,
+                                                uint32_t src_nonpremul) {
+  // Extract 16-bit color components.
+  uint32_t sa = 0x101 * (0xFF & (src_nonpremul >> 24));
+  uint32_t sr = 0x101 * (0xFF & (src_nonpremul >> 16));
+  uint32_t sg = 0x101 * (0xFF & (src_nonpremul >> 8));
+  uint32_t sb = 0x101 * (0xFF & (src_nonpremul >> 0));
+  uint32_t da = 0x101 * (0xFF & (dst_premul >> 24));
+  uint32_t dr = 0x101 * (0xFF & (dst_premul >> 16));
+  uint32_t dg = 0x101 * (0xFF & (dst_premul >> 8));
+  uint32_t db = 0x101 * (0xFF & (dst_premul >> 0));
+
+  // Calculate the inverse of the src-alpha: how much of the dst to keep.
+  uint32_t ia = 0xFFFF - sa;
+
+  // Composite src (nonpremul) over dst (premul).
+  da = sa + ((da * ia) / 0xFFFF);
+  dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
+  dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
+  db = ((sb * sa) + (db * ia)) / 0xFFFF;
+
+  // Convert from 16-bit color to 8-bit color.
+  da >>= 8;
+  dr >>= 8;
+  dg >>= 8;
+  db >>= 8;
+
+  // Combine components.
+  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
+}
+
+static inline uint64_t  //
+wuffs_base__composite_premul_nonpremul_u64_axxx(uint64_t dst_premul,
+                                                uint64_t src_nonpremul) {
+  // Extract components.
+  uint64_t sa = 0xFFFF & (src_nonpremul >> 48);
+  uint64_t sr = 0xFFFF & (src_nonpremul >> 32);
+  uint64_t sg = 0xFFFF & (src_nonpremul >> 16);
+  uint64_t sb = 0xFFFF & (src_nonpremul >> 0);
+  uint64_t da = 0xFFFF & (dst_premul >> 48);
+  uint64_t dr = 0xFFFF & (dst_premul >> 32);
+  uint64_t dg = 0xFFFF & (dst_premul >> 16);
+  uint64_t db = 0xFFFF & (dst_premul >> 0);
+
+  // Calculate the inverse of the src-alpha: how much of the dst to keep.
+  uint64_t ia = 0xFFFF - sa;
+
+  // Composite src (nonpremul) over dst (premul).
+  da = sa + ((da * ia) / 0xFFFF);
+  dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
+  dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
+  db = ((sb * sa) + (db * ia)) / 0xFFFF;
+
+  // Combine components.
+  return (db << 0) | (dg << 16) | (dr << 32) | (da << 48);
+}
+
+static inline uint32_t  //
+wuffs_base__composite_premul_premul_u32_axxx(uint32_t dst_premul,
+                                             uint32_t src_premul) {
+  // Extract 16-bit color components.
+  uint32_t sa = 0x101 * (0xFF & (src_premul >> 24));
+  uint32_t sr = 0x101 * (0xFF & (src_premul >> 16));
+  uint32_t sg = 0x101 * (0xFF & (src_premul >> 8));
+  uint32_t sb = 0x101 * (0xFF & (src_premul >> 0));
+  uint32_t da = 0x101 * (0xFF & (dst_premul >> 24));
+  uint32_t dr = 0x101 * (0xFF & (dst_premul >> 16));
+  uint32_t dg = 0x101 * (0xFF & (dst_premul >> 8));
+  uint32_t db = 0x101 * (0xFF & (dst_premul >> 0));
+
+  // Calculate the inverse of the src-alpha: how much of the dst to keep.
+  uint32_t ia = 0xFFFF - sa;
+
+  // Composite src (premul) over dst (premul).
+  da = sa + ((da * ia) / 0xFFFF);
+  dr = sr + ((dr * ia) / 0xFFFF);
+  dg = sg + ((dg * ia) / 0xFFFF);
+  db = sb + ((db * ia) / 0xFFFF);
+
+  // Convert from 16-bit color to 8-bit color.
+  da >>= 8;
+  dr >>= 8;
+  dg >>= 8;
+  db >>= 8;
+
+  // Combine components.
+  return (db << 0) | (dg << 8) | (dr << 16) | (da << 24);
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__squash_align4_bgr_565_8888(uint8_t* dst_ptr,
+                                                       size_t dst_len,
+                                                       const uint8_t* src_ptr,
+                                                       size_t src_len,
+                                                       bool nonpremul) {
+  size_t len = (dst_len < src_len ? dst_len : src_len) / 4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n--) {
+    uint32_t argb = wuffs_base__peek_u32le__no_bounds_check(s);
+    if (nonpremul) {
+      argb =
+          wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(argb);
+    }
+    uint32_t b5 = 0x1F & (argb >> (8 - 5));
+    uint32_t g6 = 0x3F & (argb >> (16 - 6));
+    uint32_t r5 = 0x1F & (argb >> (24 - 5));
+    uint32_t alpha = argb & 0xFF000000;
+    wuffs_base__poke_u32le__no_bounds_check(
+        d, alpha | (r5 << 11) | (g6 << 5) | (b5 << 0));
+    s += 4;
+    d += 4;
+  }
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__swap_rgb_bgr(uint8_t* dst_ptr,
+                                         size_t dst_len,
+                                         uint8_t* dst_palette_ptr,
+                                         size_t dst_palette_len,
+                                         const uint8_t* src_ptr,
+                                         size_t src_len) {
+  size_t len = (dst_len < src_len ? dst_len : src_len) / 3;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n--) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    uint8_t s2 = s[2];
+    d[0] = s2;
+    d[1] = s1;
+    d[2] = s0;
+    s += 3;
+    d += 3;
+  }
+  return len;
+}
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_sse42
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2")
+static uint64_t  //
+wuffs_base__pixel_swizzler__swap_rgbx_bgrx__sse42(uint8_t* dst_ptr,
+                                                  size_t dst_len,
+                                                  uint8_t* dst_palette_ptr,
+                                                  size_t dst_palette_len,
+                                                  const uint8_t* src_ptr,
+                                                  size_t src_len) {
+  size_t len = (dst_len < src_len ? dst_len : src_len) / 4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  __m128i shuffle = _mm_set_epi8(+0x0F, +0x0C, +0x0D, +0x0E,  //
+                                 +0x0B, +0x08, +0x09, +0x0A,  //
+                                 +0x07, +0x04, +0x05, +0x06,  //
+                                 +0x03, +0x00, +0x01, +0x02);
+
+  while (n >= 4) {
+    __m128i x;
+    x = _mm_lddqu_si128((const __m128i*)(const void*)s);
+    x = _mm_shuffle_epi8(x, shuffle);
+    _mm_storeu_si128((__m128i*)(void*)d, x);
+
+    s += 4 * 4;
+    d += 4 * 4;
+    n -= 4;
+  }
+
+  while (n--) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    uint8_t s2 = s[2];
+    uint8_t s3 = s[3];
+    d[0] = s2;
+    d[1] = s1;
+    d[2] = s0;
+    d[3] = s3;
+    s += 4;
+    d += 4;
+  }
+  return len;
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_sse42
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__swap_rgbx_bgrx(uint8_t* dst_ptr,
+                                           size_t dst_len,
+                                           uint8_t* dst_palette_ptr,
+                                           size_t dst_palette_len,
+                                           const uint8_t* src_ptr,
+                                           size_t src_len) {
+  size_t len = (dst_len < src_len ? dst_len : src_len) / 4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n--) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    uint8_t s2 = s[2];
+    uint8_t s3 = s[3];
+    d[0] = s2;
+    d[1] = s1;
+    d[2] = s0;
+    d[3] = s3;
+    s += 4;
+    d += 4;
+  }
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_1_1(uint8_t* dst_ptr,
+                                     size_t dst_len,
+                                     uint8_t* dst_palette_ptr,
+                                     size_t dst_palette_len,
+                                     const uint8_t* src_ptr,
+                                     size_t src_len) {
+  size_t len = (dst_len < src_len) ? dst_len : src_len;
+  if (len > 0) {
+    memmove(dst_ptr, src_ptr, len);
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_2_2(uint8_t* dst_ptr,
+                                     size_t dst_len,
+                                     uint8_t* dst_palette_ptr,
+                                     size_t dst_palette_len,
+                                     const uint8_t* src_ptr,
+                                     size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len2 < src_len2) ? dst_len2 : src_len2;
+  if (len > 0) {
+    memmove(dst_ptr, src_ptr, len * 2);
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_3_3(uint8_t* dst_ptr,
+                                     size_t dst_len,
+                                     uint8_t* dst_palette_ptr,
+                                     size_t dst_palette_len,
+                                     const uint8_t* src_ptr,
+                                     size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len3 = src_len / 3;
+  size_t len = (dst_len3 < src_len3) ? dst_len3 : src_len3;
+  if (len > 0) {
+    memmove(dst_ptr, src_ptr, len * 3);
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_4_4(uint8_t* dst_ptr,
+                                     size_t dst_len,
+                                     uint8_t* dst_palette_ptr,
+                                     size_t dst_palette_len,
+                                     const uint8_t* src_ptr,
+                                     size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  if (len > 0) {
+    memmove(dst_ptr, src_ptr, len * 4);
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__copy_8_8(uint8_t* dst_ptr,
+                                     size_t dst_len,
+                                     uint8_t* dst_palette_ptr,
+                                     size_t dst_palette_len,
+                                     const uint8_t* src_ptr,
+                                     size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len8 < src_len8) ? dst_len8 : src_len8;
+  if (len > 0) {
+    memmove(dst_ptr, src_ptr, len * 8);
+  }
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__bgr(uint8_t* dst_ptr,
+                                         size_t dst_len,
+                                         uint8_t* dst_palette_ptr,
+                                         size_t dst_palette_len,
+                                         const uint8_t* src_ptr,
+                                         size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len3 = src_len / 3;
+  size_t len = (dst_len2 < src_len3) ? dst_len2 : src_len3;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t b5 = s[0] >> 3;
+    uint32_t g6 = s[1] >> 2;
+    uint32_t r5 = s[2] >> 3;
+    uint32_t rgb_565 = (r5 << 11) | (g6 << 5) | (b5 << 0);
+    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)rgb_565);
+
+    s += 1 * 3;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__bgrx(uint8_t* dst_ptr,
+                                          size_t dst_len,
+                                          uint8_t* dst_palette_ptr,
+                                          size_t dst_palette_len,
+                                          const uint8_t* src_ptr,
+                                          size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t b5 = s[0] >> 3;
+    uint32_t g6 = s[1] >> 2;
+    uint32_t r5 = s[2] >> 3;
+    uint32_t rgb_565 = (r5 << 11) | (g6 << 5) | (b5 << 0);
+    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)rgb_565);
+
+    s += 1 * 4;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (0 * 2),
+        wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
+            wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
+                wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)))));
+
+    s += 1 * 4;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul_4x16le__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len2 < src_len8) ? dst_len2 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (0 * 2),
+        wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
+            wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(
+                wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8)))));
+
+    s += 1 * 8;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    // Extract 16-bit color components.
+    uint32_t sa = 0x101 * ((uint32_t)s[3]);
+    uint32_t sr = 0x101 * ((uint32_t)s[2]);
+    uint32_t sg = 0x101 * ((uint32_t)s[1]);
+    uint32_t sb = 0x101 * ((uint32_t)s[0]);
+
+    // Convert from 565 color to 16-bit color.
+    uint32_t old_rgb_565 = wuffs_base__peek_u16le__no_bounds_check(d + (0 * 2));
+    uint32_t old_r5 = 0x1F & (old_rgb_565 >> 11);
+    uint32_t dr = (0x8421 * old_r5) >> 4;
+    uint32_t old_g6 = 0x3F & (old_rgb_565 >> 5);
+    uint32_t dg = (0x1041 * old_g6) >> 2;
+    uint32_t old_b5 = 0x1F & (old_rgb_565 >> 0);
+    uint32_t db = (0x8421 * old_b5) >> 4;
+
+    // Calculate the inverse of the src-alpha: how much of the dst to keep.
+    uint32_t ia = 0xFFFF - sa;
+
+    // Composite src (nonpremul) over dst (premul).
+    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
+    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
+    db = ((sb * sa) + (db * ia)) / 0xFFFF;
+
+    // Convert from 16-bit color to 565 color and combine the components.
+    uint32_t new_r5 = 0x1F & (dr >> 11);
+    uint32_t new_g6 = 0x3F & (dg >> 10);
+    uint32_t new_b5 = 0x1F & (db >> 11);
+    uint32_t new_rgb_565 = (new_r5 << 11) | (new_g6 << 5) | (new_b5 << 0);
+    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)new_rgb_565);
+
+    s += 1 * 4;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul_4x16le__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len2 < src_len8) ? dst_len2 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    // Extract 16-bit color components.
+    uint32_t sa = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 6));
+    uint32_t sr = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 4));
+    uint32_t sg = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 2));
+    uint32_t sb = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 0));
+
+    // Convert from 565 color to 16-bit color.
+    uint32_t old_rgb_565 = wuffs_base__peek_u16le__no_bounds_check(d + (0 * 2));
+    uint32_t old_r5 = 0x1F & (old_rgb_565 >> 11);
+    uint32_t dr = (0x8421 * old_r5) >> 4;
+    uint32_t old_g6 = 0x3F & (old_rgb_565 >> 5);
+    uint32_t dg = (0x1041 * old_g6) >> 2;
+    uint32_t old_b5 = 0x1F & (old_rgb_565 >> 0);
+    uint32_t db = (0x8421 * old_b5) >> 4;
+
+    // Calculate the inverse of the src-alpha: how much of the dst to keep.
+    uint32_t ia = 0xFFFF - sa;
+
+    // Composite src (nonpremul) over dst (premul).
+    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
+    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
+    db = ((sb * sa) + (db * ia)) / 0xFFFF;
+
+    // Convert from 16-bit color to 565 color and combine the components.
+    uint32_t new_r5 = 0x1F & (dr >> 11);
+    uint32_t new_g6 = 0x3F & (dg >> 10);
+    uint32_t new_b5 = 0x1F & (db >> 11);
+    uint32_t new_rgb_565 = (new_r5 << 11) | (new_g6 << 5) | (new_b5 << 0);
+    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)new_rgb_565);
+
+    s += 1 * 8;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__bgra_premul__src(uint8_t* dst_ptr,
+                                                      size_t dst_len,
+                                                      uint8_t* dst_palette_ptr,
+                                                      size_t dst_palette_len,
+                                                      const uint8_t* src_ptr,
+                                                      size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (0 * 2), wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
+                         wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4))));
+
+    s += 1 * 4;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__bgra_premul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    // Extract 16-bit color components.
+    uint32_t sa = 0x101 * ((uint32_t)s[3]);
+    uint32_t sr = 0x101 * ((uint32_t)s[2]);
+    uint32_t sg = 0x101 * ((uint32_t)s[1]);
+    uint32_t sb = 0x101 * ((uint32_t)s[0]);
+
+    // Convert from 565 color to 16-bit color.
+    uint32_t old_rgb_565 = wuffs_base__peek_u16le__no_bounds_check(d + (0 * 2));
+    uint32_t old_r5 = 0x1F & (old_rgb_565 >> 11);
+    uint32_t dr = (0x8421 * old_r5) >> 4;
+    uint32_t old_g6 = 0x3F & (old_rgb_565 >> 5);
+    uint32_t dg = (0x1041 * old_g6) >> 2;
+    uint32_t old_b5 = 0x1F & (old_rgb_565 >> 0);
+    uint32_t db = (0x8421 * old_b5) >> 4;
+
+    // Calculate the inverse of the src-alpha: how much of the dst to keep.
+    uint32_t ia = 0xFFFF - sa;
+
+    // Composite src (premul) over dst (premul).
+    dr = sr + ((dr * ia) / 0xFFFF);
+    dg = sg + ((dg * ia) / 0xFFFF);
+    db = sb + ((db * ia) / 0xFFFF);
+
+    // Convert from 16-bit color to 565 color and combine the components.
+    uint32_t new_r5 = 0x1F & (dr >> 11);
+    uint32_t new_g6 = 0x3F & (dg >> 10);
+    uint32_t new_b5 = 0x1F & (db >> 11);
+    uint32_t new_rgb_565 = (new_r5 << 11) | (new_g6 << 5) | (new_b5 << 0);
+    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)new_rgb_565);
+
+    s += 1 * 4;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__rgb(uint8_t* dst_ptr,
+                                         size_t dst_len,
+                                         uint8_t* dst_palette_ptr,
+                                         size_t dst_palette_len,
+                                         const uint8_t* src_ptr,
+                                         size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len3 = src_len / 3;
+  size_t len = (dst_len2 < src_len3) ? dst_len2 : src_len3;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t r5 = s[0] >> 3;
+    uint32_t g6 = s[1] >> 2;
+    uint32_t b5 = s[2] >> 3;
+    uint32_t rgb_565 = (r5 << 11) | (g6 << 5) | (b5 << 0);
+    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)rgb_565);
+
+    s += 1 * 3;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__rgba_nonpremul__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (0 * 2),
+        wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
+            wuffs_base__swap_u32_argb_abgr(
+                wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
+                    wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4))))));
+
+    s += 1 * 4;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__rgba_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    // Extract 16-bit color components.
+    uint32_t sa = 0x101 * ((uint32_t)s[3]);
+    uint32_t sb = 0x101 * ((uint32_t)s[2]);
+    uint32_t sg = 0x101 * ((uint32_t)s[1]);
+    uint32_t sr = 0x101 * ((uint32_t)s[0]);
+
+    // Convert from 565 color to 16-bit color.
+    uint32_t old_rgb_565 = wuffs_base__peek_u16le__no_bounds_check(d + (0 * 2));
+    uint32_t old_r5 = 0x1F & (old_rgb_565 >> 11);
+    uint32_t dr = (0x8421 * old_r5) >> 4;
+    uint32_t old_g6 = 0x3F & (old_rgb_565 >> 5);
+    uint32_t dg = (0x1041 * old_g6) >> 2;
+    uint32_t old_b5 = 0x1F & (old_rgb_565 >> 0);
+    uint32_t db = (0x8421 * old_b5) >> 4;
+
+    // Calculate the inverse of the src-alpha: how much of the dst to keep.
+    uint32_t ia = 0xFFFF - sa;
+
+    // Composite src (nonpremul) over dst (premul).
+    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
+    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
+    db = ((sb * sa) + (db * ia)) / 0xFFFF;
+
+    // Convert from 16-bit color to 565 color and combine the components.
+    uint32_t new_r5 = 0x1F & (dr >> 11);
+    uint32_t new_g6 = 0x3F & (dg >> 10);
+    uint32_t new_b5 = 0x1F & (db >> 11);
+    uint32_t new_rgb_565 = (new_r5 << 11) | (new_g6 << 5) | (new_b5 << 0);
+    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)new_rgb_565);
+
+    s += 1 * 4;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__rgba_premul__src(uint8_t* dst_ptr,
+                                                      size_t dst_len,
+                                                      uint8_t* dst_palette_ptr,
+                                                      size_t dst_palette_len,
+                                                      const uint8_t* src_ptr,
+                                                      size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (0 * 2),
+        wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
+            wuffs_base__swap_u32_argb_abgr(
+                wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)))));
+
+    s += 1 * 4;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__rgba_premul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len2 < src_len4) ? dst_len2 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    // Extract 16-bit color components.
+    uint32_t sa = 0x101 * ((uint32_t)s[3]);
+    uint32_t sb = 0x101 * ((uint32_t)s[2]);
+    uint32_t sg = 0x101 * ((uint32_t)s[1]);
+    uint32_t sr = 0x101 * ((uint32_t)s[0]);
+
+    // Convert from 565 color to 16-bit color.
+    uint32_t old_rgb_565 = wuffs_base__peek_u16le__no_bounds_check(d + (0 * 2));
+    uint32_t old_r5 = 0x1F & (old_rgb_565 >> 11);
+    uint32_t dr = (0x8421 * old_r5) >> 4;
+    uint32_t old_g6 = 0x3F & (old_rgb_565 >> 5);
+    uint32_t dg = (0x1041 * old_g6) >> 2;
+    uint32_t old_b5 = 0x1F & (old_rgb_565 >> 0);
+    uint32_t db = (0x8421 * old_b5) >> 4;
+
+    // Calculate the inverse of the src-alpha: how much of the dst to keep.
+    uint32_t ia = 0xFFFF - sa;
+
+    // Composite src (premul) over dst (premul).
+    dr = sr + ((dr * ia) / 0xFFFF);
+    dg = sg + ((dg * ia) / 0xFFFF);
+    db = sb + ((db * ia) / 0xFFFF);
+
+    // Convert from 16-bit color to 565 color and combine the components.
+    uint32_t new_r5 = 0x1F & (dr >> 11);
+    uint32_t new_g6 = 0x3F & (dg >> 10);
+    uint32_t new_b5 = 0x1F & (db >> 11);
+    uint32_t new_rgb_565 = (new_r5 << 11) | (new_g6 << 5) | (new_b5 << 0);
+    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)new_rgb_565);
+
+    s += 1 * 4;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__y(uint8_t* dst_ptr,
+                                       size_t dst_len,
+                                       uint8_t* dst_palette_ptr,
+                                       size_t dst_palette_len,
+                                       const uint8_t* src_ptr,
+                                       size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t len = (dst_len2 < src_len) ? dst_len2 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t y5 = s[0] >> 3;
+    uint32_t y6 = s[0] >> 2;
+    uint32_t rgb_565 = (y5 << 11) | (y6 << 5) | (y5 << 0);
+    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)rgb_565);
+
+    s += 1 * 1;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__y_16be(uint8_t* dst_ptr,
+                                            size_t dst_len,
+                                            uint8_t* dst_palette_ptr,
+                                            size_t dst_palette_len,
+                                            const uint8_t* src_ptr,
+                                            size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len2 < src_len2) ? dst_len2 : src_len2;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t y5 = s[0] >> 3;
+    uint32_t y6 = s[0] >> 2;
+    uint32_t rgb_565 = (y5 << 11) | (y6 << 5) | (y5 << 0);
+    wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)rgb_565);
+
+    s += 1 * 2;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__index__src(uint8_t* dst_ptr,
+                                                size_t dst_len,
+                                                uint8_t* dst_palette_ptr,
+                                                size_t dst_palette_len,
+                                                const uint8_t* src_ptr,
+                                                size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len2 = dst_len / 2;
+  size_t len = (dst_len2 < src_len) ? dst_len2 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  const size_t loop_unroll_count = 4;
+
+  while (n >= loop_unroll_count) {
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (0 * 2), wuffs_base__peek_u16le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[0] * 4)));
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (1 * 2), wuffs_base__peek_u16le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[1] * 4)));
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (2 * 2), wuffs_base__peek_u16le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[2] * 4)));
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (3 * 2), wuffs_base__peek_u16le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[3] * 4)));
+
+    s += loop_unroll_count * 1;
+    d += loop_unroll_count * 2;
+    n -= loop_unroll_count;
+  }
+
+  while (n >= 1) {
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (0 * 2), wuffs_base__peek_u16le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[0] * 4)));
+
+    s += 1 * 1;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__index_bgra_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len2 = dst_len / 2;
+  size_t len = (dst_len2 < src_len) ? dst_len2 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(
+        wuffs_base__peek_u16le__no_bounds_check(d + (0 * 2)));
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    wuffs_base__poke_u16le__no_bounds_check(
+        d + (0 * 2),
+        wuffs_base__color_u32_argb_premul__as__color_u16_rgb_565(
+            wuffs_base__composite_premul_nonpremul_u32_axxx(d0, s0)));
+
+    s += 1 * 1;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr_565__index_binary_alpha__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len2 = dst_len / 2;
+  size_t len = (dst_len2 < src_len) ? dst_len2 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    if (s0) {
+      wuffs_base__poke_u16le__no_bounds_check(d + (0 * 2), (uint16_t)s0);
+    }
+
+    s += 1 * 1;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__bgr_565(uint8_t* dst_ptr,
+                                         size_t dst_len,
+                                         uint8_t* dst_palette_ptr,
+                                         size_t dst_palette_len,
+                                         const uint8_t* src_ptr,
+                                         size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len3 < src_len2) ? dst_len3 : src_len2;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(
+        wuffs_base__peek_u16le__no_bounds_check(s + (0 * 2)));
+    wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);
+
+    s += 1 * 2;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__bgra_nonpremul__src(uint8_t* dst_ptr,
+                                                     size_t dst_len,
+                                                     uint8_t* dst_palette_ptr,
+                                                     size_t dst_palette_len,
+                                                     const uint8_t* src_ptr,
+                                                     size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t s0 =
+        wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
+            wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+    wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);
+
+    s += 1 * 4;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__bgra_nonpremul_4x16le__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len3 < src_len8) ? dst_len3 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t s0 =
+        wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(
+            wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8)));
+    wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);
+
+    s += 1 * 8;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__bgra_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    // Extract 16-bit color components.
+    uint32_t sa = 0x101 * ((uint32_t)s[3]);
+    uint32_t sr = 0x101 * ((uint32_t)s[2]);
+    uint32_t sg = 0x101 * ((uint32_t)s[1]);
+    uint32_t sb = 0x101 * ((uint32_t)s[0]);
+    uint32_t dr = 0x101 * ((uint32_t)d[2]);
+    uint32_t dg = 0x101 * ((uint32_t)d[1]);
+    uint32_t db = 0x101 * ((uint32_t)d[0]);
+
+    // Calculate the inverse of the src-alpha: how much of the dst to keep.
+    uint32_t ia = 0xFFFF - sa;
+
+    // Composite src (nonpremul) over dst (premul).
+    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
+    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
+    db = ((sb * sa) + (db * ia)) / 0xFFFF;
+
+    // Convert from 16-bit color to 8-bit color.
+    d[0] = (uint8_t)(db >> 8);
+    d[1] = (uint8_t)(dg >> 8);
+    d[2] = (uint8_t)(dr >> 8);
+
+    s += 1 * 4;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__bgra_nonpremul_4x16le__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len3 < src_len8) ? dst_len3 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    // Extract 16-bit color components.
+    uint32_t sa = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 6));
+    uint32_t sr = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 4));
+    uint32_t sg = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 2));
+    uint32_t sb = ((uint32_t)wuffs_base__peek_u16le__no_bounds_check(s + 0));
+    uint32_t dr = 0x101 * ((uint32_t)d[2]);
+    uint32_t dg = 0x101 * ((uint32_t)d[1]);
+    uint32_t db = 0x101 * ((uint32_t)d[0]);
+
+    // Calculate the inverse of the src-alpha: how much of the dst to keep.
+    uint32_t ia = 0xFFFF - sa;
+
+    // Composite src (nonpremul) over dst (premul).
+    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
+    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
+    db = ((sb * sa) + (db * ia)) / 0xFFFF;
+
+    // Convert from 16-bit color to 8-bit color.
+    d[0] = (uint8_t)(db >> 8);
+    d[1] = (uint8_t)(dg >> 8);
+    d[2] = (uint8_t)(dr >> 8);
+
+    s += 1 * 8;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__bgra_premul__src(uint8_t* dst_ptr,
+                                                  size_t dst_len,
+                                                  uint8_t* dst_palette_ptr,
+                                                  size_t dst_palette_len,
+                                                  const uint8_t* src_ptr,
+                                                  size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    uint8_t s2 = s[2];
+    d[0] = s0;
+    d[1] = s1;
+    d[2] = s2;
+
+    s += 1 * 4;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__bgra_premul__src_over(uint8_t* dst_ptr,
+                                                       size_t dst_len,
+                                                       uint8_t* dst_palette_ptr,
+                                                       size_t dst_palette_len,
+                                                       const uint8_t* src_ptr,
+                                                       size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    // Extract 16-bit color components.
+    uint32_t sa = 0x101 * ((uint32_t)s[3]);
+    uint32_t sr = 0x101 * ((uint32_t)s[2]);
+    uint32_t sg = 0x101 * ((uint32_t)s[1]);
+    uint32_t sb = 0x101 * ((uint32_t)s[0]);
+    uint32_t dr = 0x101 * ((uint32_t)d[2]);
+    uint32_t dg = 0x101 * ((uint32_t)d[1]);
+    uint32_t db = 0x101 * ((uint32_t)d[0]);
+
+    // Calculate the inverse of the src-alpha: how much of the dst to keep.
+    uint32_t ia = 0xFFFF - sa;
+
+    // Composite src (premul) over dst (premul).
+    dr = sr + ((dr * ia) / 0xFFFF);
+    dg = sg + ((dg * ia) / 0xFFFF);
+    db = sb + ((db * ia) / 0xFFFF);
+
+    // Convert from 16-bit color to 8-bit color.
+    d[0] = (uint8_t)(db >> 8);
+    d[1] = (uint8_t)(dg >> 8);
+    d[2] = (uint8_t)(dr >> 8);
+
+    s += 1 * 4;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__rgba_nonpremul__src(uint8_t* dst_ptr,
+                                                     size_t dst_len,
+                                                     uint8_t* dst_palette_ptr,
+                                                     size_t dst_palette_len,
+                                                     const uint8_t* src_ptr,
+                                                     size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
+        wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(
+            wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4))));
+    wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);
+
+    s += 1 * 4;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__rgba_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    // Extract 16-bit color components.
+    uint32_t sa = 0x101 * ((uint32_t)s[3]);
+    uint32_t sb = 0x101 * ((uint32_t)s[2]);
+    uint32_t sg = 0x101 * ((uint32_t)s[1]);
+    uint32_t sr = 0x101 * ((uint32_t)s[0]);
+    uint32_t dr = 0x101 * ((uint32_t)d[2]);
+    uint32_t dg = 0x101 * ((uint32_t)d[1]);
+    uint32_t db = 0x101 * ((uint32_t)d[0]);
+
+    // Calculate the inverse of the src-alpha: how much of the dst to keep.
+    uint32_t ia = 0xFFFF - sa;
+
+    // Composite src (nonpremul) over dst (premul).
+    dr = ((sr * sa) + (dr * ia)) / 0xFFFF;
+    dg = ((sg * sa) + (dg * ia)) / 0xFFFF;
+    db = ((sb * sa) + (db * ia)) / 0xFFFF;
+
+    // Convert from 16-bit color to 8-bit color.
+    d[0] = (uint8_t)(db >> 8);
+    d[1] = (uint8_t)(dg >> 8);
+    d[2] = (uint8_t)(dr >> 8);
+
+    s += 1 * 4;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__rgba_premul__src(uint8_t* dst_ptr,
+                                                  size_t dst_len,
+                                                  uint8_t* dst_palette_ptr,
+                                                  size_t dst_palette_len,
+                                                  const uint8_t* src_ptr,
+                                                  size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    uint8_t s2 = s[2];
+    d[0] = s2;
+    d[1] = s1;
+    d[2] = s0;
+
+    s += 1 * 4;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgr__rgba_premul__src_over(uint8_t* dst_ptr,
+                                                       size_t dst_len,
+                                                       uint8_t* dst_palette_ptr,
+                                                       size_t dst_palette_len,
+                                                       const uint8_t* src_ptr,
+                                                       size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    // Extract 16-bit color components.
+    uint32_t sa = 0x101 * ((uint32_t)s[3]);
+    uint32_t sb = 0x101 * ((uint32_t)s[2]);
+    uint32_t sg = 0x101 * ((uint32_t)s[1]);
+    uint32_t sr = 0x101 * ((uint32_t)s[0]);
+    uint32_t dr = 0x101 * ((uint32_t)d[2]);
+    uint32_t dg = 0x101 * ((uint32_t)d[1]);
+    uint32_t db = 0x101 * ((uint32_t)d[0]);
+
+    // Calculate the inverse of the src-alpha: how much of the dst to keep.
+    uint32_t ia = 0xFFFF - sa;
+
+    // Composite src (premul) over dst (premul).
+    dr = sr + ((dr * ia) / 0xFFFF);
+    dg = sg + ((dg * ia) / 0xFFFF);
+    db = sb + ((db * ia) / 0xFFFF);
+
+    // Convert from 16-bit color to 8-bit color.
+    d[0] = (uint8_t)(db >> 8);
+    d[1] = (uint8_t)(dg >> 8);
+    d[2] = (uint8_t)(dr >> 8);
+
+    s += 1 * 4;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__composite_nonpremul_nonpremul_u32_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul_4x16le__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__color_u64__as__color_u32(
+                         wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8))));
+
+    s += 1 * 8;
+    d += 1 * 4;
+    n -= 1;
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul_4x16le__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint64_t d0 = wuffs_base__color_u32__as__color_u64(
+        wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4)));
+    uint64_t s0 = wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__color_u64__as__color_u32(
+            wuffs_base__composite_nonpremul_nonpremul_u64_axxx(d0, s0)));
+
+    s += 1 * 8;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_premul__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_premul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__composite_nonpremul_premul_u32_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul__index_bgra_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len4 = dst_len / 4;
+  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__composite_nonpremul_nonpremul_u32_axxx(d0, s0));
+
+    s += 1 * 1;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
+    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
+        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__composite_nonpremul_nonpremul_u32_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_premul__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
+        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_premul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
+    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
+        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__composite_nonpremul_premul_u32_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__bgra_nonpremul__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len8 < src_len4) ? dst_len8 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    uint8_t s2 = s[2];
+    uint8_t s3 = s[3];
+    d[0] = s0;
+    d[1] = s0;
+    d[2] = s1;
+    d[3] = s1;
+    d[4] = s2;
+    d[5] = s2;
+    d[6] = s3;
+    d[7] = s3;
+
+    s += 1 * 4;
+    d += 1 * 8;
+    n -= 1;
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__bgra_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len8 < src_len4) ? dst_len8 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    uint64_t d0 = wuffs_base__peek_u64le__no_bounds_check(d + (0 * 8));
+    uint64_t s0 = wuffs_base__color_u32__as__color_u64(
+        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+    wuffs_base__poke_u64le__no_bounds_check(
+        d + (0 * 8),
+        wuffs_base__composite_nonpremul_nonpremul_u64_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 8;
+    n -= 1;
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__bgra_nonpremul_4x16le__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len8 < src_len8) ? dst_len8 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    uint64_t d0 = wuffs_base__peek_u64le__no_bounds_check(d + (0 * 8));
+    uint64_t s0 = wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8));
+    wuffs_base__poke_u64le__no_bounds_check(
+        d + (0 * 8),
+        wuffs_base__composite_nonpremul_nonpremul_u64_axxx(d0, s0));
+
+    s += 1 * 8;
+    d += 1 * 8;
+    n -= 1;
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__bgra_premul__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len8 < src_len4) ? dst_len8 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    uint64_t s0 = wuffs_base__color_u32__as__color_u64(
+        wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
+            wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4))));
+    wuffs_base__poke_u64le__no_bounds_check(d + (0 * 8), s0);
+
+    s += 1 * 4;
+    d += 1 * 8;
+    n -= 1;
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__bgra_premul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len8 < src_len4) ? dst_len8 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    uint64_t d0 = wuffs_base__peek_u64le__no_bounds_check(d + (0 * 8));
+    uint64_t s0 = wuffs_base__color_u32__as__color_u64(
+        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+    wuffs_base__poke_u64le__no_bounds_check(
+        d + (0 * 8), wuffs_base__composite_nonpremul_premul_u64_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 8;
+    n -= 1;
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__index_bgra_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len8 = dst_len / 8;
+  size_t len = (dst_len8 < src_len) ? dst_len8 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint64_t d0 = wuffs_base__peek_u64le__no_bounds_check(d + (0 * 8));
+    uint64_t s0 = wuffs_base__color_u32__as__color_u64(
+        wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                ((size_t)s[0] * 4)));
+    wuffs_base__poke_u64le__no_bounds_check(
+        d + (0 * 8),
+        wuffs_base__composite_nonpremul_nonpremul_u64_axxx(d0, s0));
+
+    s += 1 * 1;
+    d += 1 * 8;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__rgba_nonpremul__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len8 < src_len4) ? dst_len8 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    uint8_t s2 = s[2];
+    uint8_t s3 = s[3];
+    d[0] = s2;
+    d[1] = s2;
+    d[2] = s1;
+    d[3] = s1;
+    d[4] = s0;
+    d[5] = s0;
+    d[6] = s3;
+    d[7] = s3;
+
+    s += 1 * 4;
+    d += 1 * 8;
+    n -= 1;
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__rgba_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len8 < src_len4) ? dst_len8 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    uint64_t d0 = wuffs_base__peek_u64le__no_bounds_check(d + (0 * 8));
+    uint64_t s0 =
+        wuffs_base__color_u32__as__color_u64(wuffs_base__swap_u32_argb_abgr(
+            wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4))));
+    wuffs_base__poke_u64le__no_bounds_check(
+        d + (0 * 8),
+        wuffs_base__composite_nonpremul_nonpremul_u64_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 8;
+    n -= 1;
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__rgba_premul__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len8 < src_len4) ? dst_len8 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    uint64_t s0 = wuffs_base__color_u32__as__color_u64(
+        wuffs_base__color_u32_argb_premul__as__color_u32_argb_nonpremul(
+            wuffs_base__swap_u32_argb_abgr(
+                wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)))));
+    wuffs_base__poke_u64le__no_bounds_check(d + (0 * 8), s0);
+
+    s += 1 * 4;
+    d += 1 * 8;
+    n -= 1;
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__rgba_premul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len8 < src_len4) ? dst_len8 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    uint64_t d0 = wuffs_base__peek_u64le__no_bounds_check(d + (0 * 8));
+    uint64_t s0 =
+        wuffs_base__color_u32__as__color_u64(wuffs_base__swap_u32_argb_abgr(
+            wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4))));
+    wuffs_base__poke_u64le__no_bounds_check(
+        d + (0 * 8), wuffs_base__composite_nonpremul_premul_u64_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 8;
+    n -= 1;
+  }
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul_4x16le__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint64_t s0 = wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(s0));
+
+    s += 1 * 8;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__composite_premul_nonpremul_u32_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul_4x16le__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint64_t d0 = wuffs_base__color_u32__as__color_u64(
+        wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4)));
+    uint64_t s0 = wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__color_u64__as__color_u32(
+            wuffs_base__composite_premul_nonpremul_u64_axxx(d0, s0)));
+
+    s += 1 * 8;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__bgra_premul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__composite_premul_premul_u32_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__index_bgra_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len4 = dst_len / 4;
+  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__composite_premul_nonpremul_u32_axxx(d0, s0));
+
+    s += 1 * 1;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
+        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__color_u32_argb_nonpremul__as__color_u32_argb_premul(s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
+    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
+        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__composite_premul_nonpremul_u32_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul_4x16le__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint64_t s0 = wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__swap_u32_argb_abgr(
+            wuffs_base__color_u64_argb_nonpremul__as__color_u32_argb_premul(
+                s0)));
+
+    s += 1 * 8;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul_4x16le__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint64_t d0 = wuffs_base__color_u32__as__color_u64(
+        wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4)));
+    uint64_t s0 = wuffs_base__swap_u64_argb_abgr(
+        wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__color_u64__as__color_u32(
+            wuffs_base__composite_premul_nonpremul_u64_axxx(d0, s0)));
+
+    s += 1 * 8;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgra_premul__rgba_premul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint32_t d0 = wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4));
+    uint32_t s0 = wuffs_base__swap_u32_argb_abgr(
+        wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__composite_premul_premul_u32_axxx(d0, s0));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgrw__bgr(uint8_t* dst_ptr,
+                                      size_t dst_len,
+                                      uint8_t* dst_palette_ptr,
+                                      size_t dst_palette_len,
+                                      const uint8_t* src_ptr,
+                                      size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len3 = src_len / 3;
+  size_t len = (dst_len4 < src_len3) ? dst_len4 : src_len3;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        0xFF000000 | wuffs_base__peek_u24le__no_bounds_check(s + (0 * 3)));
+
+    s += 1 * 3;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgrw__bgr_565(uint8_t* dst_ptr,
+                                          size_t dst_len,
+                                          uint8_t* dst_palette_ptr,
+                                          size_t dst_palette_len,
+                                          const uint8_t* src_ptr,
+                                          size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len4 < src_len2) ? dst_len4 : src_len2;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(
+                         wuffs_base__peek_u16le__no_bounds_check(s + (0 * 2))));
+
+    s += 1 * 2;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgrw__bgrx(uint8_t* dst_ptr,
+                                       size_t dst_len,
+                                       uint8_t* dst_palette_ptr,
+                                       size_t dst_palette_len,
+                                       const uint8_t* src_ptr,
+                                       size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        0xFF000000 | wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_sse42
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2")
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgrw__rgb__sse42(uint8_t* dst_ptr,
+                                             size_t dst_len,
+                                             uint8_t* dst_palette_ptr,
+                                             size_t dst_palette_len,
+                                             const uint8_t* src_ptr,
+                                             size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len3 = src_len / 3;
+  size_t len = (dst_len4 < src_len3) ? dst_len4 : src_len3;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  __m128i shuffle = _mm_set_epi8(+0x00, +0x09, +0x0A, +0x0B,  //
+                                 +0x00, +0x06, +0x07, +0x08,  //
+                                 +0x00, +0x03, +0x04, +0x05,  //
+                                 +0x00, +0x00, +0x01, +0x02);
+  __m128i or_ff = _mm_set_epi8(-0x01, +0x00, +0x00, +0x00,  //
+                               -0x01, +0x00, +0x00, +0x00,  //
+                               -0x01, +0x00, +0x00, +0x00,  //
+                               -0x01, +0x00, +0x00, +0x00);
+
+  while (n >= 6) {
+    __m128i x;
+    x = _mm_lddqu_si128((const __m128i*)(const void*)s);
+    x = _mm_shuffle_epi8(x, shuffle);
+    x = _mm_or_si128(x, or_ff);
+    _mm_storeu_si128((__m128i*)(void*)d, x);
+
+    s += 4 * 3;
+    d += 4 * 4;
+    n -= 4;
+  }
+
+  while (n >= 1) {
+    uint8_t b0 = s[0];
+    uint8_t b1 = s[1];
+    uint8_t b2 = s[2];
+    d[0] = b2;
+    d[1] = b1;
+    d[2] = b0;
+    d[3] = 0xFF;
+
+    s += 1 * 3;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_sse42
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgrw__rgb(uint8_t* dst_ptr,
+                                      size_t dst_len,
+                                      uint8_t* dst_palette_ptr,
+                                      size_t dst_palette_len,
+                                      const uint8_t* src_ptr,
+                                      size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len3 = src_len / 3;
+  size_t len = (dst_len4 < src_len3) ? dst_len4 : src_len3;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint8_t b0 = s[0];
+    uint8_t b1 = s[1];
+    uint8_t b2 = s[2];
+    d[0] = b2;
+    d[1] = b1;
+    d[2] = b0;
+    d[3] = 0xFF;
+
+    s += 1 * 3;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgrw__rgbx(uint8_t* dst_ptr,
+                                       size_t dst_len,
+                                       uint8_t* dst_palette_ptr,
+                                       size_t dst_palette_len,
+                                       const uint8_t* src_ptr,
+                                       size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len4 < src_len4) ? dst_len4 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint8_t b0 = s[0];
+    uint8_t b1 = s[1];
+    uint8_t b2 = s[2];
+    d[0] = b2;
+    d[1] = b1;
+    d[2] = b0;
+    d[3] = 0xFF;
+
+    s += 1 * 4;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgrw_4x16le__bgr(uint8_t* dst_ptr,
+                                             size_t dst_len,
+                                             uint8_t* dst_palette_ptr,
+                                             size_t dst_palette_len,
+                                             const uint8_t* src_ptr,
+                                             size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len3 = src_len / 3;
+  size_t len = (dst_len8 < src_len3) ? dst_len8 : src_len3;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    uint8_t s2 = s[2];
+    d[0] = s0;
+    d[1] = s0;
+    d[2] = s1;
+    d[3] = s1;
+    d[4] = s2;
+    d[5] = s2;
+    d[6] = 0xFF;
+    d[7] = 0xFF;
+
+    s += 1 * 3;
+    d += 1 * 8;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgrw_4x16le__bgr_565(uint8_t* dst_ptr,
+                                                 size_t dst_len,
+                                                 uint8_t* dst_palette_ptr,
+                                                 size_t dst_palette_len,
+                                                 const uint8_t* src_ptr,
+                                                 size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len8 < src_len2) ? dst_len8 : src_len2;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    wuffs_base__poke_u64le__no_bounds_check(
+        d + (0 * 8),
+        wuffs_base__color_u32__as__color_u64(
+            wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(
+                wuffs_base__peek_u16le__no_bounds_check(s + (0 * 2)))));
+
+    s += 1 * 2;
+    d += 1 * 8;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgrw_4x16le__bgrx(uint8_t* dst_ptr,
+                                              size_t dst_len,
+                                              uint8_t* dst_palette_ptr,
+                                              size_t dst_palette_len,
+                                              const uint8_t* src_ptr,
+                                              size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len8 < src_len4) ? dst_len8 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    uint8_t s2 = s[2];
+    d[0] = s0;
+    d[1] = s0;
+    d[2] = s1;
+    d[3] = s1;
+    d[4] = s2;
+    d[5] = s2;
+    d[6] = 0xFF;
+    d[7] = 0xFF;
+
+    s += 1 * 4;
+    d += 1 * 8;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__bgrw_4x16le__rgb(uint8_t* dst_ptr,
+                                             size_t dst_len,
+                                             uint8_t* dst_palette_ptr,
+                                             size_t dst_palette_len,
+                                             const uint8_t* src_ptr,
+                                             size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len3 = src_len / 3;
+  size_t len = (dst_len8 < src_len3) ? dst_len8 : src_len3;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    uint8_t s2 = s[2];
+    d[0] = s2;
+    d[1] = s2;
+    d[2] = s1;
+    d[3] = s1;
+    d[4] = s0;
+    d[5] = s0;
+    d[6] = 0xFF;
+    d[7] = 0xFF;
+
+    s += 1 * 3;
+    d += 1 * 8;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__rgba_nonpremul__bgra_nonpremul_4x16le__src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+
+  size_t n = len;
+  while (n >= 1) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__color_u64__as__color_u32__swap_u32_argb_abgr(
+                         wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8))));
+
+    s += 1 * 8;
+    d += 1 * 4;
+    n -= 1;
+  }
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__rgba_nonpremul__bgra_nonpremul_4x16le__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len8 = src_len / 8;
+  size_t len = (dst_len4 < src_len8) ? dst_len4 : src_len8;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint64_t d0 = wuffs_base__color_u32__as__color_u64(
+        wuffs_base__peek_u32le__no_bounds_check(d + (0 * 4)));
+    uint64_t s0 = wuffs_base__swap_u64_argb_abgr(
+        wuffs_base__peek_u64le__no_bounds_check(s + (0 * 8)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__color_u64__as__color_u32(
+            wuffs_base__composite_nonpremul_nonpremul_u64_axxx(d0, s0)));
+
+    s += 1 * 8;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__rgbw__bgr_565(uint8_t* dst_ptr,
+                                          size_t dst_len,
+                                          uint8_t* dst_palette_ptr,
+                                          size_t dst_palette_len,
+                                          const uint8_t* src_ptr,
+                                          size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len4 < src_len2) ? dst_len4 : src_len2;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4),
+        wuffs_base__swap_u32_argb_abgr(
+            wuffs_base__color_u16_rgb_565__as__color_u32_argb_premul(
+                wuffs_base__peek_u16le__no_bounds_check(s + (0 * 2)))));
+
+    s += 1 * 2;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxx__index__src(uint8_t* dst_ptr,
+                                            size_t dst_len,
+                                            uint8_t* dst_palette_ptr,
+                                            size_t dst_palette_len,
+                                            const uint8_t* src_ptr,
+                                            size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len3 = dst_len / 3;
+  size_t len = (dst_len3 < src_len) ? dst_len3 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  const size_t loop_unroll_count = 4;
+
+  // The comparison in the while condition is ">", not ">=", because with
+  // ">=", the last 4-byte store could write past the end of the dst slice.
+  //
+  // Each 4-byte store writes one too many bytes, but a subsequent store
+  // will overwrite that with the correct byte. There is always another
+  // store, whether a 4-byte store in this loop or a 1-byte store in the
+  // next loop.
+  while (n > loop_unroll_count) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 3), wuffs_base__peek_u32le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[0] * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (1 * 3), wuffs_base__peek_u32le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[1] * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (2 * 3), wuffs_base__peek_u32le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[2] * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (3 * 3), wuffs_base__peek_u32le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[3] * 4)));
+
+    s += loop_unroll_count * 1;
+    d += loop_unroll_count * 3;
+    n -= loop_unroll_count;
+  }
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);
+
+    s += 1 * 1;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxx__index_bgra_nonpremul__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len3 = dst_len / 3;
+  size_t len = (dst_len3 < src_len) ? dst_len3 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint32_t d0 =
+        wuffs_base__peek_u24le__no_bounds_check(d + (0 * 3)) | 0xFF000000;
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    wuffs_base__poke_u24le__no_bounds_check(
+        d + (0 * 3), wuffs_base__composite_premul_nonpremul_u32_axxx(d0, s0));
+
+    s += 1 * 1;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxx__index_binary_alpha__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len3 = dst_len / 3;
+  size_t len = (dst_len3 < src_len) ? dst_len3 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  const size_t loop_unroll_count = 4;
+
+  while (n >= loop_unroll_count) {
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    if (s0) {
+      wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);
+    }
+    uint32_t s1 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[1] * 4));
+    if (s1) {
+      wuffs_base__poke_u24le__no_bounds_check(d + (1 * 3), s1);
+    }
+    uint32_t s2 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[2] * 4));
+    if (s2) {
+      wuffs_base__poke_u24le__no_bounds_check(d + (2 * 3), s2);
+    }
+    uint32_t s3 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[3] * 4));
+    if (s3) {
+      wuffs_base__poke_u24le__no_bounds_check(d + (3 * 3), s3);
+    }
+
+    s += loop_unroll_count * 1;
+    d += loop_unroll_count * 3;
+    n -= loop_unroll_count;
+  }
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    if (s0) {
+      wuffs_base__poke_u24le__no_bounds_check(d + (0 * 3), s0);
+    }
+
+    s += 1 * 1;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxx__xxxx(uint8_t* dst_ptr,
+                                      size_t dst_len,
+                                      uint8_t* dst_palette_ptr,
+                                      size_t dst_palette_len,
+                                      const uint8_t* src_ptr,
+                                      size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len4 = src_len / 4;
+  size_t len = (dst_len3 < src_len4) ? dst_len3 : src_len4;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    wuffs_base__poke_u24le__no_bounds_check(
+        d + (0 * 3), wuffs_base__peek_u32le__no_bounds_check(s + (0 * 4)));
+
+    s += 1 * 4;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxx__y(uint8_t* dst_ptr,
+                                   size_t dst_len,
+                                   uint8_t* dst_palette_ptr,
+                                   size_t dst_palette_len,
+                                   const uint8_t* src_ptr,
+                                   size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t len = (dst_len3 < src_len) ? dst_len3 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint8_t s0 = s[0];
+    d[0] = s0;
+    d[1] = s0;
+    d[2] = s0;
+
+    s += 1 * 1;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxx__y_16be(uint8_t* dst_ptr,
+                                        size_t dst_len,
+                                        uint8_t* dst_palette_ptr,
+                                        size_t dst_palette_len,
+                                        const uint8_t* src_ptr,
+                                        size_t src_len) {
+  size_t dst_len3 = dst_len / 3;
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len3 < src_len2) ? dst_len3 : src_len2;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  // TODO: unroll.
+
+  while (n >= 1) {
+    uint8_t s0 = s[0];
+    d[0] = s0;
+    d[1] = s0;
+    d[2] = s0;
+
+    s += 1 * 2;
+    d += 1 * 3;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxxx__index__src(uint8_t* dst_ptr,
+                                             size_t dst_len,
+                                             uint8_t* dst_palette_ptr,
+                                             size_t dst_palette_len,
+                                             const uint8_t* src_ptr,
+                                             size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len4 = dst_len / 4;
+  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  const size_t loop_unroll_count = 4;
+
+  while (n >= loop_unroll_count) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__peek_u32le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[0] * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (1 * 4), wuffs_base__peek_u32le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[1] * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (2 * 4), wuffs_base__peek_u32le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[2] * 4)));
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (3 * 4), wuffs_base__peek_u32le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[3] * 4)));
+
+    s += loop_unroll_count * 1;
+    d += loop_unroll_count * 4;
+    n -= loop_unroll_count;
+  }
+
+  while (n >= 1) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), wuffs_base__peek_u32le__no_bounds_check(
+                         dst_palette_ptr + ((size_t)s[0] * 4)));
+
+    s += 1 * 1;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxxx__index_binary_alpha__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len4 = dst_len / 4;
+  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  const size_t loop_unroll_count = 4;
+
+  while (n >= loop_unroll_count) {
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    if (s0) {
+      wuffs_base__poke_u32le__no_bounds_check(d + (0 * 4), s0);
+    }
+    uint32_t s1 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[1] * 4));
+    if (s1) {
+      wuffs_base__poke_u32le__no_bounds_check(d + (1 * 4), s1);
+    }
+    uint32_t s2 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[2] * 4));
+    if (s2) {
+      wuffs_base__poke_u32le__no_bounds_check(d + (2 * 4), s2);
+    }
+    uint32_t s3 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[3] * 4));
+    if (s3) {
+      wuffs_base__poke_u32le__no_bounds_check(d + (3 * 4), s3);
+    }
+
+    s += loop_unroll_count * 1;
+    d += loop_unroll_count * 4;
+    n -= loop_unroll_count;
+  }
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    if (s0) {
+      wuffs_base__poke_u32le__no_bounds_check(d + (0 * 4), s0);
+    }
+
+    s += 1 * 1;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_sse42
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2")
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxxx__y__sse42(uint8_t* dst_ptr,
+                                           size_t dst_len,
+                                           uint8_t* dst_palette_ptr,
+                                           size_t dst_palette_len,
+                                           const uint8_t* src_ptr,
+                                           size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  __m128i shuffle = _mm_set_epi8(+0x03, +0x03, +0x03, +0x03,  //
+                                 +0x02, +0x02, +0x02, +0x02,  //
+                                 +0x01, +0x01, +0x01, +0x01,  //
+                                 +0x00, +0x00, +0x00, +0x00);
+  __m128i or_ff = _mm_set_epi8(-0x01, +0x00, +0x00, +0x00,  //
+                               -0x01, +0x00, +0x00, +0x00,  //
+                               -0x01, +0x00, +0x00, +0x00,  //
+                               -0x01, +0x00, +0x00, +0x00);
+
+  while (n >= 4) {
+    __m128i x;
+    x = _mm_cvtsi32_si128((int)(wuffs_base__peek_u32le__no_bounds_check(s)));
+    x = _mm_shuffle_epi8(x, shuffle);
+    x = _mm_or_si128(x, or_ff);
+    _mm_storeu_si128((__m128i*)(void*)d, x);
+
+    s += 4 * 1;
+    d += 4 * 4;
+    n -= 4;
+  }
+
+  while (n >= 1) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), 0xFF000000 | (0x010101 * (uint32_t)s[0]));
+
+    s += 1 * 1;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_sse42
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxxx__y(uint8_t* dst_ptr,
+                                    size_t dst_len,
+                                    uint8_t* dst_palette_ptr,
+                                    size_t dst_palette_len,
+                                    const uint8_t* src_ptr,
+                                    size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t len = (dst_len4 < src_len) ? dst_len4 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), 0xFF000000 | (0x010101 * (uint32_t)s[0]));
+
+    s += 1 * 1;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxxx__y_16be(uint8_t* dst_ptr,
+                                         size_t dst_len,
+                                         uint8_t* dst_palette_ptr,
+                                         size_t dst_palette_len,
+                                         const uint8_t* src_ptr,
+                                         size_t src_len) {
+  size_t dst_len4 = dst_len / 4;
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len4 < src_len2) ? dst_len4 : src_len2;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    wuffs_base__poke_u32le__no_bounds_check(
+        d + (0 * 4), 0xFF000000 | (0x010101 * (uint32_t)s[0]));
+
+    s += 1 * 2;
+    d += 1 * 4;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxxxxxxx__index__src(uint8_t* dst_ptr,
+                                                 size_t dst_len,
+                                                 uint8_t* dst_palette_ptr,
+                                                 size_t dst_palette_len,
+                                                 const uint8_t* src_ptr,
+                                                 size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len8 = dst_len / 8;
+  size_t len = (dst_len8 < src_len) ? dst_len8 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    wuffs_base__poke_u64le__no_bounds_check(
+        d + (0 * 8), wuffs_base__color_u32__as__color_u64(
+                         wuffs_base__peek_u32le__no_bounds_check(
+                             dst_palette_ptr + ((size_t)s[0] * 4))));
+
+    s += 1 * 1;
+    d += 1 * 8;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxxxxxxx__index_binary_alpha__src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    const uint8_t* src_ptr,
+    size_t src_len) {
+  if (dst_palette_len !=
+      WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+    return 0;
+  }
+  size_t dst_len8 = dst_len / 8;
+  size_t len = (dst_len8 < src_len) ? dst_len8 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint32_t s0 = wuffs_base__peek_u32le__no_bounds_check(dst_palette_ptr +
+                                                          ((size_t)s[0] * 4));
+    if (s0) {
+      wuffs_base__poke_u64le__no_bounds_check(
+          d + (0 * 8), wuffs_base__color_u32__as__color_u64(s0));
+    }
+
+    s += 1 * 1;
+    d += 1 * 8;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxxxxxxx__y(uint8_t* dst_ptr,
+                                        size_t dst_len,
+                                        uint8_t* dst_palette_ptr,
+                                        size_t dst_palette_len,
+                                        const uint8_t* src_ptr,
+                                        size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t len = (dst_len8 < src_len) ? dst_len8 : src_len;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    wuffs_base__poke_u64le__no_bounds_check(
+        d + (0 * 8), 0xFFFF000000000000 | (0x010101010101 * (uint64_t)s[0]));
+
+    s += 1 * 1;
+    d += 1 * 8;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__xxxxxxxx__y_16be(uint8_t* dst_ptr,
+                                             size_t dst_len,
+                                             uint8_t* dst_palette_ptr,
+                                             size_t dst_palette_len,
+                                             const uint8_t* src_ptr,
+                                             size_t src_len) {
+  size_t dst_len8 = dst_len / 8;
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len8 < src_len2) ? dst_len8 : src_len2;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint64_t s0 =
+        ((uint64_t)(wuffs_base__peek_u16be__no_bounds_check(s + (0 * 2))));
+    wuffs_base__poke_u64le__no_bounds_check(
+        d + (0 * 8), 0xFFFF000000000000 | (0x000100010001 * s0));
+
+    s += 1 * 2;
+    d += 1 * 8;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__y__y_16be(uint8_t* dst_ptr,
+                                      size_t dst_len,
+                                      uint8_t* dst_palette_ptr,
+                                      size_t dst_palette_len,
+                                      const uint8_t* src_ptr,
+                                      size_t src_len) {
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len < src_len2) ? dst_len : src_len2;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    d[0] = s[0];
+
+    s += 1 * 2;
+    d += 1 * 1;
+    n -= 1;
+  }
+
+  return len;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__y_16le__y_16be(uint8_t* dst_ptr,
+                                           size_t dst_len,
+                                           uint8_t* dst_palette_ptr,
+                                           size_t dst_palette_len,
+                                           const uint8_t* src_ptr,
+                                           size_t src_len) {
+  size_t dst_len2 = dst_len / 2;
+  size_t src_len2 = src_len / 2;
+  size_t len = (dst_len2 < src_len2) ? dst_len2 : src_len2;
+  uint8_t* d = dst_ptr;
+  const uint8_t* s = src_ptr;
+  size_t n = len;
+
+  while (n >= 1) {
+    uint8_t s0 = s[0];
+    uint8_t s1 = s[1];
+    d[0] = s1;
+    d[1] = s0;
+
+    s += 1 * 2;
+    d += 1 * 2;
+    n -= 1;
+  }
+
+  return len;
+}
+
+// --------
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__transparent_black_src(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    uint64_t num_pixels,
+    uint32_t dst_pixfmt_bytes_per_pixel) {
+  uint64_t n = ((uint64_t)dst_len) / dst_pixfmt_bytes_per_pixel;
+  if (n > num_pixels) {
+    n = num_pixels;
+  }
+  memset(dst_ptr, 0, ((size_t)(n * dst_pixfmt_bytes_per_pixel)));
+  return n;
+}
+
+static uint64_t  //
+wuffs_base__pixel_swizzler__transparent_black_src_over(
+    uint8_t* dst_ptr,
+    size_t dst_len,
+    uint8_t* dst_palette_ptr,
+    size_t dst_palette_len,
+    uint64_t num_pixels,
+    uint32_t dst_pixfmt_bytes_per_pixel) {
+  uint64_t n = ((uint64_t)dst_len) / dst_pixfmt_bytes_per_pixel;
+  if (n > num_pixels) {
+    n = num_pixels;
+  }
+  return n;
+}
+
+// --------
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__y(wuffs_base__pixel_swizzler* p,
+                                       wuffs_base__pixel_format dst_pixfmt,
+                                       wuffs_base__slice_u8 dst_palette,
+                                       wuffs_base__slice_u8 src_palette,
+                                       wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__Y:
+      return wuffs_base__pixel_swizzler__copy_1_1;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      return wuffs_base__pixel_swizzler__bgr_565__y;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      return wuffs_base__pixel_swizzler__xxx__y;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+      if (wuffs_base__cpu_arch__have_x86_sse42()) {
+        return wuffs_base__pixel_swizzler__xxxx__y__sse42;
+      }
+#endif
+      return wuffs_base__pixel_swizzler__xxxx__y;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL_4X16LE:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL_4X16LE:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL_4X16LE:
+      return wuffs_base__pixel_swizzler__xxxxxxxx__y;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__y_16be(wuffs_base__pixel_swizzler* p,
+                                            wuffs_base__pixel_format dst_pixfmt,
+                                            wuffs_base__slice_u8 dst_palette,
+                                            wuffs_base__slice_u8 src_palette,
+                                            wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__Y:
+      return wuffs_base__pixel_swizzler__y__y_16be;
+
+    case WUFFS_BASE__PIXEL_FORMAT__Y_16LE:
+      return wuffs_base__pixel_swizzler__y_16le__y_16be;
+
+    case WUFFS_BASE__PIXEL_FORMAT__Y_16BE:
+      return wuffs_base__pixel_swizzler__copy_2_2;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      return wuffs_base__pixel_swizzler__bgr_565__y_16be;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      return wuffs_base__pixel_swizzler__xxx__y_16be;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      return wuffs_base__pixel_swizzler__xxxx__y_16be;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL_4X16LE:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL_4X16LE:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL_4X16LE:
+      return wuffs_base__pixel_swizzler__xxxxxxxx__y_16be;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__indexed__bgra_nonpremul(
+    wuffs_base__pixel_swizzler* p,
+    wuffs_base__pixel_format dst_pixfmt,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src_palette,
+    wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
+      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+          WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__copy_1_1;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          if (wuffs_base__pixel_swizzler__squash_align4_bgr_565_8888(
+                  dst_palette.ptr, dst_palette.len, src_palette.ptr,
+                  src_palette.len, true) !=
+              (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
+            return NULL;
+          }
+          return wuffs_base__pixel_swizzler__bgr_565__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+              WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+            return NULL;
+          }
+          return wuffs_base__pixel_swizzler__bgr_565__index_bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          if (wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src(
+                  dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
+                  src_palette.len) !=
+              (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
+            return NULL;
+          }
+          return wuffs_base__pixel_swizzler__xxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+              WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+            return NULL;
+          }
+          return wuffs_base__pixel_swizzler__xxx__index_bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+          WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__xxxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__index_bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+          WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__xxxxxxxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__index_bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          if (wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src(
+                  dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
+                  src_palette.len) !=
+              (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
+            return NULL;
+          }
+          return wuffs_base__pixel_swizzler__xxxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+              WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+            return NULL;
+          }
+          return wuffs_base__pixel_swizzler__bgra_premul__index_bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      // TODO.
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(
+              dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
+              src_palette.len) !=
+          (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__xxxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__index_bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          if (wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src(
+                  dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
+                  src_palette.len) !=
+              (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
+            return NULL;
+          }
+          return wuffs_base__pixel_swizzler__xxxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(
+                  dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
+                  src_palette.len) !=
+              (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
+            return NULL;
+          }
+          return wuffs_base__pixel_swizzler__bgra_premul__index_bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      // TODO.
+      break;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__indexed__bgra_binary(
+    wuffs_base__pixel_swizzler* p,
+    wuffs_base__pixel_format dst_pixfmt,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src_palette,
+    wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
+      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+          WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__copy_1_1;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      if (wuffs_base__pixel_swizzler__squash_align4_bgr_565_8888(
+              dst_palette.ptr, dst_palette.len, src_palette.ptr,
+              src_palette.len, false) !=
+          (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr_565__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr_565__index_binary_alpha__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+          WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__xxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__xxx__index_binary_alpha__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+          WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__xxxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__xxxx__index_binary_alpha__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL_4X16LE:
+      if (wuffs_base__slice_u8__copy_from_slice(dst_palette, src_palette) !=
+          WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__xxxxxxxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__xxxxxxxx__index_binary_alpha__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(
+              dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
+              src_palette.len) !=
+          (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__xxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__xxx__index_binary_alpha__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+      if (wuffs_base__pixel_swizzler__swap_rgbx_bgrx(
+              dst_palette.ptr, dst_palette.len, NULL, 0, src_palette.ptr,
+              src_palette.len) !=
+          (WUFFS_BASE__PIXEL_FORMAT__INDEXED__PALETTE_BYTE_LENGTH / 4)) {
+        return NULL;
+      }
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__xxxx__index__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__xxxx__index_binary_alpha__src_over;
+      }
+      return NULL;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__bgr_565(
+    wuffs_base__pixel_swizzler* p,
+    wuffs_base__pixel_format dst_pixfmt,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src_palette,
+    wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      return wuffs_base__pixel_swizzler__copy_2_2;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      return wuffs_base__pixel_swizzler__bgr__bgr_565;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+      return wuffs_base__pixel_swizzler__bgrw__bgr_565;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL_4X16LE:
+      return wuffs_base__pixel_swizzler__bgrw_4x16le__bgr_565;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      return wuffs_base__pixel_swizzler__rgbw__bgr_565;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__bgr(wuffs_base__pixel_swizzler* p,
+                                         wuffs_base__pixel_format dst_pixfmt,
+                                         wuffs_base__slice_u8 dst_palette,
+                                         wuffs_base__slice_u8 src_palette,
+                                         wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      return wuffs_base__pixel_swizzler__bgr_565__bgr;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      return wuffs_base__pixel_swizzler__copy_3_3;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+      return wuffs_base__pixel_swizzler__bgrw__bgr;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL_4X16LE:
+      return wuffs_base__pixel_swizzler__bgrw_4x16le__bgr;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      return wuffs_base__pixel_swizzler__swap_rgb_bgr;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+      if (wuffs_base__cpu_arch__have_x86_sse42()) {
+        return wuffs_base__pixel_swizzler__bgrw__rgb__sse42;
+      }
+#endif
+      return wuffs_base__pixel_swizzler__bgrw__rgb;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__bgra_nonpremul(
+    wuffs_base__pixel_swizzler* p,
+    wuffs_base__pixel_format dst_pixfmt,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src_palette,
+    wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr__bgra_nonpremul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr__bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__copy_4_4;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__bgra_nonpremul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+      // TODO.
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      // TODO.
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+          if (wuffs_base__cpu_arch__have_x86_sse42()) {
+            return wuffs_base__pixel_swizzler__swap_rgbx_bgrx__sse42;
+          }
+#endif
+          return wuffs_base__pixel_swizzler__swap_rgbx_bgrx;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      // TODO.
+      break;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__bgra_nonpremul_4x16le(
+    wuffs_base__pixel_swizzler* p,
+    wuffs_base__pixel_format dst_pixfmt,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src_palette,
+    wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul_4x16le__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr_565__bgra_nonpremul_4x16le__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr__bgra_nonpremul_4x16le__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr__bgra_nonpremul_4x16le__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul_4x16le__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul_4x16le__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__copy_8_8;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__bgra_nonpremul_4x16le__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul_4x16le__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul_4x16le__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+      // TODO.
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      // TODO.
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__rgba_nonpremul__bgra_nonpremul_4x16le__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__rgba_nonpremul__bgra_nonpremul_4x16le__src_over;
+      }
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul_4x16le__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul_4x16le__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      // TODO.
+      break;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__bgra_premul(
+    wuffs_base__pixel_swizzler* p,
+    wuffs_base__pixel_format dst_pixfmt,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src_palette,
+    wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr_565__bgra_premul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr_565__bgra_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr__bgra_premul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr__bgra_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_premul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__bgra_premul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__bgra_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__copy_4_4;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_premul__bgra_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_premul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+          if (wuffs_base__cpu_arch__have_x86_sse42()) {
+            return wuffs_base__pixel_swizzler__swap_rgbx_bgrx__sse42;
+          }
+#endif
+          return wuffs_base__pixel_swizzler__swap_rgbx_bgrx;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_premul__rgba_premul__src_over;
+      }
+      return NULL;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__bgrx(wuffs_base__pixel_swizzler* p,
+                                          wuffs_base__pixel_format dst_pixfmt,
+                                          wuffs_base__slice_u8 dst_palette,
+                                          wuffs_base__slice_u8 src_palette,
+                                          wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      return wuffs_base__pixel_swizzler__bgr_565__bgrx;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      return wuffs_base__pixel_swizzler__xxx__xxxx;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+      return wuffs_base__pixel_swizzler__bgrw__bgrx;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      return wuffs_base__pixel_swizzler__bgrw_4x16le__bgrx;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+      return wuffs_base__pixel_swizzler__copy_4_4;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      // TODO.
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      return wuffs_base__pixel_swizzler__bgrw__rgbx;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__rgb(wuffs_base__pixel_swizzler* p,
+                                         wuffs_base__pixel_format dst_pixfmt,
+                                         wuffs_base__slice_u8 dst_palette,
+                                         wuffs_base__slice_u8 src_palette,
+                                         wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      return wuffs_base__pixel_swizzler__bgr_565__rgb;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      return wuffs_base__pixel_swizzler__swap_rgb_bgr;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+      if (wuffs_base__cpu_arch__have_x86_sse42()) {
+        return wuffs_base__pixel_swizzler__bgrw__rgb__sse42;
+      }
+#endif
+      return wuffs_base__pixel_swizzler__bgrw__rgb;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      return wuffs_base__pixel_swizzler__bgrw_4x16le__rgb;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      return wuffs_base__pixel_swizzler__copy_3_3;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      return wuffs_base__pixel_swizzler__bgrw__bgr;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__rgba_nonpremul(
+    wuffs_base__pixel_swizzler* p,
+    wuffs_base__pixel_format dst_pixfmt,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src_palette,
+    wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr_565__rgba_nonpremul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr_565__rgba_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr__rgba_nonpremul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr__rgba_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+          if (wuffs_base__cpu_arch__have_x86_sse42()) {
+            return wuffs_base__pixel_swizzler__swap_rgbx_bgrx__sse42;
+          }
+#endif
+          return wuffs_base__pixel_swizzler__swap_rgbx_bgrx;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__rgba_nonpremul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__rgba_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_premul__rgba_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+      // TODO.
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      // TODO.
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__copy_4_4;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_premul__bgra_nonpremul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_BINARY:
+    case WUFFS_BASE__PIXEL_FORMAT__RGBX:
+      // TODO.
+      break;
+  }
+  return NULL;
+}
+
+static wuffs_base__pixel_swizzler__func  //
+wuffs_base__pixel_swizzler__prepare__rgba_premul(
+    wuffs_base__pixel_swizzler* p,
+    wuffs_base__pixel_format dst_pixfmt,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src_palette,
+    wuffs_base__pixel_blend blend) {
+  switch (dst_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr_565__rgba_premul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr_565__rgba_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgr__rgba_premul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgr__rgba_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_premul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__rgba_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__rgba_premul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul_4x16le__rgba_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+          if (wuffs_base__cpu_arch__have_x86_sse42()) {
+            return wuffs_base__pixel_swizzler__swap_rgbx_bgrx__sse42;
+          }
+#endif
+          return wuffs_base__pixel_swizzler__swap_rgbx_bgrx;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_premul__rgba_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_premul__src;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_nonpremul__bgra_premul__src_over;
+      }
+      return NULL;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+      switch (blend) {
+        case WUFFS_BASE__PIXEL_BLEND__SRC:
+          return wuffs_base__pixel_swizzler__copy_4_4;
+        case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+          return wuffs_base__pixel_swizzler__bgra_premul__bgra_premul__src_over;
+      }
+      return NULL;
+  }
+  return NULL;
+}
+
+// --------
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status  //
+wuffs_base__pixel_swizzler__prepare(wuffs_base__pixel_swizzler* p,
+                                    wuffs_base__pixel_format dst_pixfmt,
+                                    wuffs_base__slice_u8 dst_palette,
+                                    wuffs_base__pixel_format src_pixfmt,
+                                    wuffs_base__slice_u8 src_palette,
+                                    wuffs_base__pixel_blend blend) {
+  if (!p) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  p->private_impl.func = NULL;
+  p->private_impl.transparent_black_func = NULL;
+  p->private_impl.dst_pixfmt_bytes_per_pixel = 0;
+  p->private_impl.src_pixfmt_bytes_per_pixel = 0;
+
+  wuffs_base__pixel_swizzler__func func = NULL;
+  wuffs_base__pixel_swizzler__transparent_black_func transparent_black_func =
+      NULL;
+
+  uint32_t dst_pixfmt_bits_per_pixel =
+      wuffs_base__pixel_format__bits_per_pixel(&dst_pixfmt);
+  if ((dst_pixfmt_bits_per_pixel == 0) ||
+      ((dst_pixfmt_bits_per_pixel & 7) != 0)) {
+    return wuffs_base__make_status(
+        wuffs_base__error__unsupported_pixel_swizzler_option);
+  }
+
+  uint32_t src_pixfmt_bits_per_pixel =
+      wuffs_base__pixel_format__bits_per_pixel(&src_pixfmt);
+  if ((src_pixfmt_bits_per_pixel == 0) ||
+      ((src_pixfmt_bits_per_pixel & 7) != 0)) {
+    return wuffs_base__make_status(
+        wuffs_base__error__unsupported_pixel_swizzler_option);
+  }
+
+  // TODO: support many more formats.
+
+  switch (blend) {
+    case WUFFS_BASE__PIXEL_BLEND__SRC:
+      transparent_black_func =
+          wuffs_base__pixel_swizzler__transparent_black_src;
+      break;
+
+    case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+      transparent_black_func =
+          wuffs_base__pixel_swizzler__transparent_black_src_over;
+      break;
+  }
+
+  switch (src_pixfmt.repr) {
+    case WUFFS_BASE__PIXEL_FORMAT__Y:
+      func = wuffs_base__pixel_swizzler__prepare__y(p, dst_pixfmt, dst_palette,
+                                                    src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__Y_16BE:
+      func = wuffs_base__pixel_swizzler__prepare__y_16be(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_NONPREMUL:
+      func = wuffs_base__pixel_swizzler__prepare__indexed__bgra_nonpremul(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__INDEXED__BGRA_BINARY:
+      func = wuffs_base__pixel_swizzler__prepare__indexed__bgra_binary(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      func = wuffs_base__pixel_swizzler__prepare__bgr_565(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      func = wuffs_base__pixel_swizzler__prepare__bgr(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      func = wuffs_base__pixel_swizzler__prepare__bgra_nonpremul(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      func = wuffs_base__pixel_swizzler__prepare__bgra_nonpremul_4x16le(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+      func = wuffs_base__pixel_swizzler__prepare__bgra_premul(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__BGRX:
+      func = wuffs_base__pixel_swizzler__prepare__bgrx(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGB:
+      func = wuffs_base__pixel_swizzler__prepare__rgb(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      func = wuffs_base__pixel_swizzler__prepare__rgba_nonpremul(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+
+    case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+      func = wuffs_base__pixel_swizzler__prepare__rgba_premul(
+          p, dst_pixfmt, dst_palette, src_palette, blend);
+      break;
+  }
+
+  p->private_impl.func = func;
+  p->private_impl.transparent_black_func = transparent_black_func;
+  p->private_impl.dst_pixfmt_bytes_per_pixel = dst_pixfmt_bits_per_pixel / 8;
+  p->private_impl.src_pixfmt_bytes_per_pixel = src_pixfmt_bits_per_pixel / 8;
+  return wuffs_base__make_status(
+      func ? NULL : wuffs_base__error__unsupported_pixel_swizzler_option);
+}
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_base__pixel_swizzler__limited_swizzle_u32_interleaved_from_reader(
+    const wuffs_base__pixel_swizzler* p,
+    uint32_t up_to_num_pixels,
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    const uint8_t** ptr_iop_r,
+    const uint8_t* io2_r) {
+  if (p && p->private_impl.func) {
+    const uint8_t* iop_r = *ptr_iop_r;
+    uint64_t src_len = wuffs_base__u64__min(
+        ((uint64_t)up_to_num_pixels) *
+            ((uint64_t)p->private_impl.src_pixfmt_bytes_per_pixel),
+        ((uint64_t)(io2_r - iop_r)));
+    uint64_t n =
+        (*p->private_impl.func)(dst.ptr, dst.len, dst_palette.ptr,
+                                dst_palette.len, iop_r, (size_t)src_len);
+    *ptr_iop_r += n * p->private_impl.src_pixfmt_bytes_per_pixel;
+    return n;
+  }
+  return 0;
+}
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_base__pixel_swizzler__swizzle_interleaved_from_reader(
+    const wuffs_base__pixel_swizzler* p,
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    const uint8_t** ptr_iop_r,
+    const uint8_t* io2_r) {
+  if (p && p->private_impl.func) {
+    const uint8_t* iop_r = *ptr_iop_r;
+    uint64_t src_len = ((uint64_t)(io2_r - iop_r));
+    uint64_t n =
+        (*p->private_impl.func)(dst.ptr, dst.len, dst_palette.ptr,
+                                dst_palette.len, iop_r, (size_t)src_len);
+    *ptr_iop_r += n * p->private_impl.src_pixfmt_bytes_per_pixel;
+    return n;
+  }
+  return 0;
+}
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(
+    const wuffs_base__pixel_swizzler* p,
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    wuffs_base__slice_u8 src) {
+  if (p && p->private_impl.func) {
+    return (*p->private_impl.func)(dst.ptr, dst.len, dst_palette.ptr,
+                                   dst_palette.len, src.ptr, src.len);
+  }
+  return 0;
+}
+
+WUFFS_BASE__MAYBE_STATIC uint64_t  //
+wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(
+    const wuffs_base__pixel_swizzler* p,
+    wuffs_base__slice_u8 dst,
+    wuffs_base__slice_u8 dst_palette,
+    uint64_t num_pixels) {
+  if (p && p->private_impl.transparent_black_func) {
+    return (*p->private_impl.transparent_black_func)(
+        dst.ptr, dst.len, dst_palette.ptr, dst_palette.len, num_pixels,
+        p->private_impl.dst_pixfmt_bytes_per_pixel);
+  }
+  return 0;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE__PIXCONV)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BASE) || \
+    defined(WUFFS_CONFIG__MODULE__BASE__UTF8)
+
+// ---------------- Unicode and UTF-8
+
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__utf_8__encode(wuffs_base__slice_u8 dst, uint32_t code_point) {
+  if (code_point <= 0x7F) {
+    if (dst.len >= 1) {
+      dst.ptr[0] = (uint8_t)(code_point);
+      return 1;
+    }
+
+  } else if (code_point <= 0x07FF) {
+    if (dst.len >= 2) {
+      dst.ptr[0] = (uint8_t)(0xC0 | ((code_point >> 6)));
+      dst.ptr[1] = (uint8_t)(0x80 | ((code_point >> 0) & 0x3F));
+      return 2;
+    }
+
+  } else if (code_point <= 0xFFFF) {
+    if ((dst.len >= 3) && ((code_point < 0xD800) || (0xDFFF < code_point))) {
+      dst.ptr[0] = (uint8_t)(0xE0 | ((code_point >> 12)));
+      dst.ptr[1] = (uint8_t)(0x80 | ((code_point >> 6) & 0x3F));
+      dst.ptr[2] = (uint8_t)(0x80 | ((code_point >> 0) & 0x3F));
+      return 3;
+    }
+
+  } else if (code_point <= 0x10FFFF) {
+    if (dst.len >= 4) {
+      dst.ptr[0] = (uint8_t)(0xF0 | ((code_point >> 18)));
+      dst.ptr[1] = (uint8_t)(0x80 | ((code_point >> 12) & 0x3F));
+      dst.ptr[2] = (uint8_t)(0x80 | ((code_point >> 6) & 0x3F));
+      dst.ptr[3] = (uint8_t)(0x80 | ((code_point >> 0) & 0x3F));
+      return 4;
+    }
+  }
+
+  return 0;
+}
+
+// wuffs_base__utf_8__byte_length_minus_1 is the byte length (minus 1) of a
+// UTF-8 encoded code point, based on the encoding's initial byte.
+//  - 0x00 is 1-byte UTF-8 (ASCII).
+//  - 0x01 is the start of 2-byte UTF-8.
+//  - 0x02 is the start of 3-byte UTF-8.
+//  - 0x03 is the start of 4-byte UTF-8.
+//  - 0x40 is a UTF-8 tail byte.
+//  - 0x80 is invalid UTF-8.
+//
+// RFC 3629 (UTF-8) gives this grammar for valid UTF-8:
+//    UTF8-1      = %x00-7F
+//    UTF8-2      = %xC2-DF UTF8-tail
+//    UTF8-3      = %xE0 %xA0-BF UTF8-tail / %xE1-EC 2( UTF8-tail ) /
+//                  %xED %x80-9F UTF8-tail / %xEE-EF 2( UTF8-tail )
+//    UTF8-4      = %xF0 %x90-BF 2( UTF8-tail ) / %xF1-F3 3( UTF8-tail ) /
+//                  %xF4 %x80-8F 2( UTF8-tail )
+//    UTF8-tail   = %x80-BF
+static const uint8_t wuffs_base__utf_8__byte_length_minus_1[256] = {
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x00 ..= 0x07.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x08 ..= 0x0F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x10 ..= 0x17.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x18 ..= 0x1F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x20 ..= 0x27.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x28 ..= 0x2F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x30 ..= 0x37.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x38 ..= 0x3F.
+
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x40 ..= 0x47.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x48 ..= 0x4F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x50 ..= 0x57.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x58 ..= 0x5F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x60 ..= 0x67.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x68 ..= 0x6F.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x70 ..= 0x77.
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  // 0x78 ..= 0x7F.
+
+    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x80 ..= 0x87.
+    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x88 ..= 0x8F.
+    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x90 ..= 0x97.
+    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x98 ..= 0x9F.
+    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0xA0 ..= 0xA7.
+    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0xA8 ..= 0xAF.
+    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0xB0 ..= 0xB7.
+    0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0xB8 ..= 0xBF.
+
+    0x80, 0x80, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,  // 0xC0 ..= 0xC7.
+    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,  // 0xC8 ..= 0xCF.
+    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,  // 0xD0 ..= 0xD7.
+    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,  // 0xD8 ..= 0xDF.
+    0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  // 0xE0 ..= 0xE7.
+    0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  // 0xE8 ..= 0xEF.
+    0x03, 0x03, 0x03, 0x03, 0x03, 0x80, 0x80, 0x80,  // 0xF0 ..= 0xF7.
+    0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,  // 0xF8 ..= 0xFF.
+    // 0     1     2     3     4     5     6     7
+    // 8     9     A     B     C     D     E     F
+};
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__utf_8__next__output  //
+wuffs_base__utf_8__next(const uint8_t* s_ptr, size_t s_len) {
+  if (s_len == 0) {
+    return wuffs_base__make_utf_8__next__output(0, 0);
+  }
+  uint32_t c = s_ptr[0];
+  switch (wuffs_base__utf_8__byte_length_minus_1[c & 0xFF]) {
+    case 0:
+      return wuffs_base__make_utf_8__next__output(c, 1);
+
+    case 1:
+      if (s_len < 2) {
+        break;
+      }
+      c = wuffs_base__peek_u16le__no_bounds_check(s_ptr);
+      if ((c & 0xC000) != 0x8000) {
+        break;
+      }
+      c = (0x0007C0 & (c << 6)) | (0x00003F & (c >> 8));
+      return wuffs_base__make_utf_8__next__output(c, 2);
+
+    case 2:
+      if (s_len < 3) {
+        break;
+      }
+      c = wuffs_base__peek_u24le__no_bounds_check(s_ptr);
+      if ((c & 0xC0C000) != 0x808000) {
+        break;
+      }
+      c = (0x00F000 & (c << 12)) | (0x000FC0 & (c >> 2)) |
+          (0x00003F & (c >> 16));
+      if ((c <= 0x07FF) || ((0xD800 <= c) && (c <= 0xDFFF))) {
+        break;
+      }
+      return wuffs_base__make_utf_8__next__output(c, 3);
+
+    case 3:
+      if (s_len < 4) {
+        break;
+      }
+      c = wuffs_base__peek_u32le__no_bounds_check(s_ptr);
+      if ((c & 0xC0C0C000) != 0x80808000) {
+        break;
+      }
+      c = (0x1C0000 & (c << 18)) | (0x03F000 & (c << 4)) |
+          (0x000FC0 & (c >> 10)) | (0x00003F & (c >> 24));
+      if ((c <= 0xFFFF) || (0x110000 <= c)) {
+        break;
+      }
+      return wuffs_base__make_utf_8__next__output(c, 4);
+  }
+
+  return wuffs_base__make_utf_8__next__output(
+      WUFFS_BASE__UNICODE_REPLACEMENT_CHARACTER, 1);
+}
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__utf_8__next__output  //
+wuffs_base__utf_8__next_from_end(const uint8_t* s_ptr, size_t s_len) {
+  if (s_len == 0) {
+    return wuffs_base__make_utf_8__next__output(0, 0);
+  }
+  const uint8_t* ptr = &s_ptr[s_len - 1];
+  if (*ptr < 0x80) {
+    return wuffs_base__make_utf_8__next__output(*ptr, 1);
+
+  } else if (*ptr < 0xC0) {
+    const uint8_t* too_far = &s_ptr[(s_len > 4) ? (s_len - 4) : 0];
+    uint32_t n = 1;
+    while (ptr != too_far) {
+      ptr--;
+      n++;
+      if (*ptr < 0x80) {
+        break;
+      } else if (*ptr < 0xC0) {
+        continue;
+      }
+      wuffs_base__utf_8__next__output o = wuffs_base__utf_8__next(ptr, n);
+      if (o.byte_length != n) {
+        break;
+      }
+      return o;
+    }
+  }
+
+  return wuffs_base__make_utf_8__next__output(
+      WUFFS_BASE__UNICODE_REPLACEMENT_CHARACTER, 1);
+}
+
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__utf_8__longest_valid_prefix(const uint8_t* s_ptr, size_t s_len) {
+  // TODO: possibly optimize the all-ASCII case (4 or 8 bytes at a time).
+  //
+  // TODO: possibly optimize this by manually inlining the
+  // wuffs_base__utf_8__next calls.
+  size_t original_len = s_len;
+  while (s_len > 0) {
+    wuffs_base__utf_8__next__output o = wuffs_base__utf_8__next(s_ptr, s_len);
+    if ((o.code_point > 0x7F) && (o.byte_length == 1)) {
+      break;
+    }
+    s_ptr += o.byte_length;
+    s_len -= o.byte_length;
+  }
+  return original_len - s_len;
+}
+
+WUFFS_BASE__MAYBE_STATIC size_t  //
+wuffs_base__ascii__longest_valid_prefix(const uint8_t* s_ptr, size_t s_len) {
+  // TODO: possibly optimize this by checking 4 or 8 bytes at a time.
+  const uint8_t* original_ptr = s_ptr;
+  const uint8_t* p = s_ptr;
+  const uint8_t* q = s_ptr + s_len;
+  for (; (p != q) && ((*p & 0x80) == 0); p++) {
+  }
+  return (size_t)(p - original_ptr);
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE) ||
+        // defined(WUFFS_CONFIG__MODULE__BASE__UTF8)
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ADLER32)
+
+// ---------------- Status Codes Implementations
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__empty_struct
+wuffs_adler32__hasher__up(
+    wuffs_adler32__hasher* self,
+    wuffs_base__slice_u8 a_x);
+
+static wuffs_base__empty_struct
+wuffs_adler32__hasher__up__choosy_default(
+    wuffs_adler32__hasher* self,
+    wuffs_base__slice_u8 a_x);
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+static wuffs_base__empty_struct
+wuffs_adler32__hasher__up_arm_neon(
+    wuffs_adler32__hasher* self,
+    wuffs_base__slice_u8 a_x);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+static wuffs_base__empty_struct
+wuffs_adler32__hasher__up_x86_sse42(
+    wuffs_adler32__hasher* self,
+    wuffs_base__slice_u8 a_x);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+
+// ---------------- VTables
+
+const wuffs_base__hasher_u32__func_ptrs
+wuffs_adler32__hasher__func_ptrs_for__wuffs_base__hasher_u32 = {
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_adler32__hasher__set_quirk_enabled),
+  (uint32_t(*)(void*,
+      wuffs_base__slice_u8))(&wuffs_adler32__hasher__update_u32),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_adler32__hasher__initialize(
+    wuffs_adler32__hasher* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.choosy_up = &wuffs_adler32__hasher__up__choosy_default;
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__hasher_u32.vtable_name =
+      wuffs_base__hasher_u32__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__hasher_u32.function_pointers =
+      (const void*)(&wuffs_adler32__hasher__func_ptrs_for__wuffs_base__hasher_u32);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_adler32__hasher*
+wuffs_adler32__hasher__alloc() {
+  wuffs_adler32__hasher* x =
+      (wuffs_adler32__hasher*)(calloc(sizeof(wuffs_adler32__hasher), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_adler32__hasher__initialize(
+      x, sizeof(wuffs_adler32__hasher), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_adler32__hasher() {
+  return sizeof(wuffs_adler32__hasher);
+}
+
+// ---------------- Function Implementations
+
+// -------- func adler32.hasher.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_adler32__hasher__set_quirk_enabled(
+    wuffs_adler32__hasher* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func adler32.hasher.update_u32
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_adler32__hasher__update_u32(
+    wuffs_adler32__hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  if (!self) {
+    return 0;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return 0;
+  }
+
+  if ( ! self->private_impl.f_started) {
+    self->private_impl.f_started = true;
+    self->private_impl.f_state = 1;
+    self->private_impl.choosy_up = (
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+        wuffs_base__cpu_arch__have_arm_neon() ? &wuffs_adler32__hasher__up_arm_neon :
+#endif
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_adler32__hasher__up_x86_sse42 :
+#endif
+        self->private_impl.choosy_up);
+  }
+  wuffs_adler32__hasher__up(self, a_x);
+  return self->private_impl.f_state;
+}
+
+// -------- func adler32.hasher.up
+
+static wuffs_base__empty_struct
+wuffs_adler32__hasher__up(
+    wuffs_adler32__hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  return (*self->private_impl.choosy_up)(self, a_x);
+}
+
+static wuffs_base__empty_struct
+wuffs_adler32__hasher__up__choosy_default(
+    wuffs_adler32__hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  uint32_t v_s1 = 0;
+  uint32_t v_s2 = 0;
+  wuffs_base__slice_u8 v_remaining = {0};
+  wuffs_base__slice_u8 v_p = {0};
+
+  v_s1 = ((self->private_impl.f_state) & 0xFFFF);
+  v_s2 = ((self->private_impl.f_state) >> (32 - (16)));
+  while (((uint64_t)(a_x.len)) > 0) {
+    v_remaining = wuffs_base__slice_u8__subslice_j(a_x, 0);
+    if (((uint64_t)(a_x.len)) > 5552) {
+      v_remaining = wuffs_base__slice_u8__subslice_i(a_x, 5552);
+      a_x = wuffs_base__slice_u8__subslice_j(a_x, 5552);
+    }
+    {
+      wuffs_base__slice_u8 i_slice_p = a_x;
+      v_p.ptr = i_slice_p.ptr;
+      v_p.len = 1;
+      uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 8) * 8);
+      while (v_p.ptr < i_end0_p) {
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+      }
+      v_p.len = 1;
+      uint8_t* i_end1_p = i_slice_p.ptr + i_slice_p.len;
+      while (v_p.ptr < i_end1_p) {
+        v_s1 += ((uint32_t)(v_p.ptr[0]));
+        v_s2 += v_s1;
+        v_p.ptr += 1;
+      }
+      v_p.len = 0;
+    }
+    v_s1 %= 65521;
+    v_s2 %= 65521;
+    a_x = v_remaining;
+  }
+  self->private_impl.f_state = (((v_s2 & 65535) << 16) | (v_s1 & 65535));
+  return wuffs_base__make_empty_struct();
+}
+
+// ‼ WUFFS MULTI-FILE SECTION +arm_neon
+// -------- func adler32.hasher.up_arm_neon
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+static wuffs_base__empty_struct
+wuffs_adler32__hasher__up_arm_neon(
+    wuffs_adler32__hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  uint32_t v_s1 = 0;
+  uint32_t v_s2 = 0;
+  wuffs_base__slice_u8 v_remaining = {0};
+  wuffs_base__slice_u8 v_p = {0};
+  uint8x16_t v_p__left = {0};
+  uint8x16_t v_p_right = {0};
+  uint32x4_t v_v1 = {0};
+  uint32x4_t v_v2 = {0};
+  uint16x8_t v_col0 = {0};
+  uint16x8_t v_col1 = {0};
+  uint16x8_t v_col2 = {0};
+  uint16x8_t v_col3 = {0};
+  uint32x2_t v_sum1 = {0};
+  uint32x2_t v_sum2 = {0};
+  uint32x2_t v_sum12 = {0};
+  uint32_t v_num_iterate_bytes = 0;
+  uint64_t v_tail_index = 0;
+
+  v_s1 = ((self->private_impl.f_state) & 0xFFFF);
+  v_s2 = ((self->private_impl.f_state) >> (32 - (16)));
+  while ((((uint64_t)(a_x.len)) > 0) && ((15 & ((uint32_t)(0xFFF & (uintptr_t)(a_x.ptr)))) != 0)) {
+    v_s1 += ((uint32_t)(a_x.ptr[0]));
+    v_s2 += v_s1;
+    a_x = wuffs_base__slice_u8__subslice_i(a_x, 1);
+  }
+  v_s1 %= 65521;
+  v_s2 %= 65521;
+  while (((uint64_t)(a_x.len)) > 0) {
+    v_remaining = wuffs_base__slice_u8__subslice_j(a_x, 0);
+    if (((uint64_t)(a_x.len)) > 5536) {
+      v_remaining = wuffs_base__slice_u8__subslice_i(a_x, 5536);
+      a_x = wuffs_base__slice_u8__subslice_j(a_x, 5536);
+    }
+    v_num_iterate_bytes = ((uint32_t)((((uint64_t)(a_x.len)) & 4294967264)));
+    v_s2 += ((uint32_t)(v_s1 * v_num_iterate_bytes));
+    v_v1 = vdupq_n_u32(0);
+    v_v2 = vdupq_n_u32(0);
+    v_col0 = vdupq_n_u16(0);
+    v_col1 = vdupq_n_u16(0);
+    v_col2 = vdupq_n_u16(0);
+    v_col3 = vdupq_n_u16(0);
+    {
+      wuffs_base__slice_u8 i_slice_p = a_x;
+      v_p.ptr = i_slice_p.ptr;
+      v_p.len = 32;
+      uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 32) * 32);
+      while (v_p.ptr < i_end0_p) {
+        v_p__left = vld1q_u8(v_p.ptr);
+        v_p_right = vld1q_u8(v_p.ptr + 16);
+        v_v2 = vaddq_u32(v_v2, v_v1);
+        v_v1 = vpadalq_u16(v_v1, vpadalq_u8(vpaddlq_u8(v_p__left), v_p_right));
+        v_col0 = vaddw_u8(v_col0, vget_low_u8(v_p__left));
+        v_col1 = vaddw_u8(v_col1, vget_high_u8(v_p__left));
+        v_col2 = vaddw_u8(v_col2, vget_low_u8(v_p_right));
+        v_col3 = vaddw_u8(v_col3, vget_high_u8(v_p_right));
+        v_p.ptr += 32;
+      }
+      v_p.len = 0;
+    }
+    v_v2 = vshlq_n_u32(v_v2, 5);
+    v_v2 = vmlal_u16(v_v2, vget_low_u16(v_col0), ((uint16x4_t){32, 31, 30, 29}));
+    v_v2 = vmlal_u16(v_v2, vget_high_u16(v_col0), ((uint16x4_t){28, 27, 26, 25}));
+    v_v2 = vmlal_u16(v_v2, vget_low_u16(v_col1), ((uint16x4_t){24, 23, 22, 21}));
+    v_v2 = vmlal_u16(v_v2, vget_high_u16(v_col1), ((uint16x4_t){20, 19, 18, 17}));
+    v_v2 = vmlal_u16(v_v2, vget_low_u16(v_col2), ((uint16x4_t){16, 15, 14, 13}));
+    v_v2 = vmlal_u16(v_v2, vget_high_u16(v_col2), ((uint16x4_t){12, 11, 10, 9}));
+    v_v2 = vmlal_u16(v_v2, vget_low_u16(v_col3), ((uint16x4_t){8, 7, 6, 5}));
+    v_v2 = vmlal_u16(v_v2, vget_high_u16(v_col3), ((uint16x4_t){4, 3, 2, 1}));
+    v_sum1 = vpadd_u32(vget_low_u32(v_v1), vget_high_u32(v_v1));
+    v_sum2 = vpadd_u32(vget_low_u32(v_v2), vget_high_u32(v_v2));
+    v_sum12 = vpadd_u32(v_sum1, v_sum2);
+    v_s1 += vget_lane_u32(v_sum12, 0);
+    v_s2 += vget_lane_u32(v_sum12, 1);
+    v_tail_index = (((uint64_t)(a_x.len)) & 18446744073709551584u);
+    if (v_tail_index < ((uint64_t)(a_x.len))) {
+      {
+        wuffs_base__slice_u8 i_slice_p = wuffs_base__slice_u8__subslice_i(a_x, v_tail_index);
+        v_p.ptr = i_slice_p.ptr;
+        v_p.len = 1;
+        uint8_t* i_end0_p = i_slice_p.ptr + i_slice_p.len;
+        while (v_p.ptr < i_end0_p) {
+          v_s1 += ((uint32_t)(v_p.ptr[0]));
+          v_s2 += v_s1;
+          v_p.ptr += 1;
+        }
+        v_p.len = 0;
+      }
+    }
+    v_s1 %= 65521;
+    v_s2 %= 65521;
+    a_x = v_remaining;
+  }
+  self->private_impl.f_state = (((v_s2 & 65535) << 16) | (v_s1 & 65535));
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+// ‼ WUFFS MULTI-FILE SECTION -arm_neon
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_sse42
+// -------- func adler32.hasher.up_x86_sse42
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2")
+static wuffs_base__empty_struct
+wuffs_adler32__hasher__up_x86_sse42(
+    wuffs_adler32__hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  uint32_t v_s1 = 0;
+  uint32_t v_s2 = 0;
+  wuffs_base__slice_u8 v_remaining = {0};
+  wuffs_base__slice_u8 v_p = {0};
+  __m128i v_zeroes = {0};
+  __m128i v_ones = {0};
+  __m128i v_weights__left = {0};
+  __m128i v_weights_right = {0};
+  __m128i v_q__left = {0};
+  __m128i v_q_right = {0};
+  __m128i v_v1 = {0};
+  __m128i v_v2 = {0};
+  __m128i v_v2j = {0};
+  __m128i v_v2k = {0};
+  uint32_t v_num_iterate_bytes = 0;
+  uint64_t v_tail_index = 0;
+
+  v_zeroes = _mm_set1_epi16((int16_t)(0));
+  v_ones = _mm_set1_epi16((int16_t)(1));
+  v_weights__left = _mm_set_epi8((int8_t)(17), (int8_t)(18), (int8_t)(19), (int8_t)(20), (int8_t)(21), (int8_t)(22), (int8_t)(23), (int8_t)(24), (int8_t)(25), (int8_t)(26), (int8_t)(27), (int8_t)(28), (int8_t)(29), (int8_t)(30), (int8_t)(31), (int8_t)(32));
+  v_weights_right = _mm_set_epi8((int8_t)(1), (int8_t)(2), (int8_t)(3), (int8_t)(4), (int8_t)(5), (int8_t)(6), (int8_t)(7), (int8_t)(8), (int8_t)(9), (int8_t)(10), (int8_t)(11), (int8_t)(12), (int8_t)(13), (int8_t)(14), (int8_t)(15), (int8_t)(16));
+  v_s1 = ((self->private_impl.f_state) & 0xFFFF);
+  v_s2 = ((self->private_impl.f_state) >> (32 - (16)));
+  while (((uint64_t)(a_x.len)) > 0) {
+    v_remaining = wuffs_base__slice_u8__subslice_j(a_x, 0);
+    if (((uint64_t)(a_x.len)) > 5536) {
+      v_remaining = wuffs_base__slice_u8__subslice_i(a_x, 5536);
+      a_x = wuffs_base__slice_u8__subslice_j(a_x, 5536);
+    }
+    v_num_iterate_bytes = ((uint32_t)((((uint64_t)(a_x.len)) & 4294967264)));
+    v_s2 += ((uint32_t)(v_s1 * v_num_iterate_bytes));
+    v_v1 = _mm_setzero_si128();
+    v_v2j = _mm_setzero_si128();
+    v_v2k = _mm_setzero_si128();
+    {
+      wuffs_base__slice_u8 i_slice_p = a_x;
+      v_p.ptr = i_slice_p.ptr;
+      v_p.len = 32;
+      uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 32) * 32);
+      while (v_p.ptr < i_end0_p) {
+        v_q__left = _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr));
+        v_q_right = _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 16));
+        v_v2j = _mm_add_epi32(v_v2j, v_v1);
+        v_v1 = _mm_add_epi32(v_v1, _mm_sad_epu8(v_q__left, v_zeroes));
+        v_v1 = _mm_add_epi32(v_v1, _mm_sad_epu8(v_q_right, v_zeroes));
+        v_v2k = _mm_add_epi32(v_v2k, _mm_madd_epi16(v_ones, _mm_maddubs_epi16(v_q__left, v_weights__left)));
+        v_v2k = _mm_add_epi32(v_v2k, _mm_madd_epi16(v_ones, _mm_maddubs_epi16(v_q_right, v_weights_right)));
+        v_p.ptr += 32;
+      }
+      v_p.len = 0;
+    }
+    v_v1 = _mm_add_epi32(v_v1, _mm_shuffle_epi32(v_v1, (int32_t)(177)));
+    v_v1 = _mm_add_epi32(v_v1, _mm_shuffle_epi32(v_v1, (int32_t)(78)));
+    v_s1 += ((uint32_t)(_mm_cvtsi128_si32(v_v1)));
+    v_v2 = _mm_add_epi32(v_v2k, _mm_slli_epi32(v_v2j, (int32_t)(5)));
+    v_v2 = _mm_add_epi32(v_v2, _mm_shuffle_epi32(v_v2, (int32_t)(177)));
+    v_v2 = _mm_add_epi32(v_v2, _mm_shuffle_epi32(v_v2, (int32_t)(78)));
+    v_s2 += ((uint32_t)(_mm_cvtsi128_si32(v_v2)));
+    v_tail_index = (((uint64_t)(a_x.len)) & 18446744073709551584u);
+    if (v_tail_index < ((uint64_t)(a_x.len))) {
+      {
+        wuffs_base__slice_u8 i_slice_p = wuffs_base__slice_u8__subslice_i(a_x, v_tail_index);
+        v_p.ptr = i_slice_p.ptr;
+        v_p.len = 1;
+        uint8_t* i_end0_p = i_slice_p.ptr + i_slice_p.len;
+        while (v_p.ptr < i_end0_p) {
+          v_s1 += ((uint32_t)(v_p.ptr[0]));
+          v_s2 += v_s1;
+          v_p.ptr += 1;
+        }
+        v_p.len = 0;
+      }
+    }
+    v_s1 %= 65521;
+    v_s2 %= 65521;
+    a_x = v_remaining;
+  }
+  self->private_impl.f_state = (((v_s2 & 65535) << 16) | (v_s1 & 65535));
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_sse42
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ADLER32)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BMP)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_bmp__error__bad_header[] = "#bmp: bad header";
+const char wuffs_bmp__error__bad_rle_compression[] = "#bmp: bad RLE compression";
+const char wuffs_bmp__error__unsupported_bmp_file[] = "#bmp: unsupported BMP file";
+const char wuffs_bmp__note__internal_note_short_read[] = "@bmp: internal note: short read";
+
+// ---------------- Private Consts
+
+#define WUFFS_BMP__COMPRESSION_NONE 0
+
+#define WUFFS_BMP__COMPRESSION_RLE8 1
+
+#define WUFFS_BMP__COMPRESSION_RLE4 2
+
+#define WUFFS_BMP__COMPRESSION_BITFIELDS 3
+
+#define WUFFS_BMP__COMPRESSION_JPEG 4
+
+#define WUFFS_BMP__COMPRESSION_PNG 5
+
+#define WUFFS_BMP__COMPRESSION_ALPHABITFIELDS 6
+
+#define WUFFS_BMP__COMPRESSION_LOW_BIT_DEPTH 256
+
+#define WUFFS_BMP__RLE_STATE_NEUTRAL 0
+
+#define WUFFS_BMP__RLE_STATE_RUN 1
+
+#define WUFFS_BMP__RLE_STATE_ESCAPE 2
+
+#define WUFFS_BMP__RLE_STATE_LITERAL 3
+
+#define WUFFS_BMP__RLE_STATE_DELTA_X 4
+
+#define WUFFS_BMP__RLE_STATE_DELTA_Y 5
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__status
+wuffs_bmp__decoder__swizzle_none(
+    wuffs_bmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_bmp__decoder__swizzle_rle(
+    wuffs_bmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_bmp__decoder__swizzle_bitfields(
+    wuffs_bmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_bmp__decoder__swizzle_low_bit_depth(
+    wuffs_bmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_bmp__decoder__read_palette(
+    wuffs_bmp__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_bmp__decoder__process_masks(
+    wuffs_bmp__decoder* self);
+
+// ---------------- VTables
+
+const wuffs_base__image_decoder__func_ptrs
+wuffs_bmp__decoder__func_ptrs_for__wuffs_base__image_decoder = {
+  (wuffs_base__status(*)(void*,
+      wuffs_base__pixel_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__pixel_blend,
+      wuffs_base__slice_u8,
+      wuffs_base__decode_frame_options*))(&wuffs_bmp__decoder__decode_frame),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__frame_config*,
+      wuffs_base__io_buffer*))(&wuffs_bmp__decoder__decode_frame_config),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__image_config*,
+      wuffs_base__io_buffer*))(&wuffs_bmp__decoder__decode_image_config),
+  (wuffs_base__rect_ie_u32(*)(const void*))(&wuffs_bmp__decoder__frame_dirty_rect),
+  (uint32_t(*)(const void*))(&wuffs_bmp__decoder__num_animation_loops),
+  (uint64_t(*)(const void*))(&wuffs_bmp__decoder__num_decoded_frame_configs),
+  (uint64_t(*)(const void*))(&wuffs_bmp__decoder__num_decoded_frames),
+  (wuffs_base__status(*)(void*,
+      uint64_t,
+      uint64_t))(&wuffs_bmp__decoder__restart_frame),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_bmp__decoder__set_quirk_enabled),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_bmp__decoder__set_report_metadata),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__io_buffer*,
+      wuffs_base__more_information*,
+      wuffs_base__io_buffer*))(&wuffs_bmp__decoder__tell_me_more),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_bmp__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_bmp__decoder__initialize(
+    wuffs_bmp__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__image_decoder.vtable_name =
+      wuffs_base__image_decoder__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__image_decoder.function_pointers =
+      (const void*)(&wuffs_bmp__decoder__func_ptrs_for__wuffs_base__image_decoder);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_bmp__decoder*
+wuffs_bmp__decoder__alloc() {
+  wuffs_bmp__decoder* x =
+      (wuffs_bmp__decoder*)(calloc(sizeof(wuffs_bmp__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_bmp__decoder__initialize(
+      x, sizeof(wuffs_bmp__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_bmp__decoder() {
+  return sizeof(wuffs_bmp__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func bmp.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_bmp__decoder__set_quirk_enabled(
+    wuffs_bmp__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func bmp.decoder.decode_image_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_bmp__decoder__decode_image_config(
+    wuffs_bmp__decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_magic = 0;
+  uint32_t v_width = 0;
+  uint32_t v_height = 0;
+  uint32_t v_planes = 0;
+  uint32_t v_dst_pixfmt = 0;
+  uint32_t v_byte_width = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if ((self->private_impl.f_call_sequence != 0) || (self->private_impl.f_io_redirect_fourcc == 1)) {
+      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+      goto exit;
+    } else if (self->private_impl.f_io_redirect_fourcc != 0) {
+      status = wuffs_base__make_status(wuffs_base__note__i_o_redirect);
+      goto ok;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_0 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_image_config[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
+          if (num_bits_0 == 8) {
+            t_0 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0)) << 56;
+        }
+      }
+      v_magic = t_0;
+    }
+    if (v_magic != 19778) {
+      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
+      goto exit;
+    }
+    self->private_data.s_decode_image_config[0].scratch = 8;
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+    if (self->private_data.s_decode_image_config[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+      self->private_data.s_decode_image_config[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+      iop_a_src = io2_a_src;
+      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+      goto suspend;
+    }
+    iop_a_src += self->private_data.s_decode_image_config[0].scratch;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+      uint32_t t_1;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_1 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_image_config[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
+          if (num_bits_1 == 24) {
+            t_1 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_1 += 8;
+          *scratch |= ((uint64_t)(num_bits_1)) << 56;
+        }
+      }
+      self->private_impl.f_padding = t_1;
+    }
+    if (self->private_impl.f_padding < 14) {
+      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
+      goto exit;
+    }
+    self->private_impl.f_padding -= 14;
+    self->private_impl.f_io_redirect_pos = wuffs_base__u64__sat_add(((uint64_t)(self->private_impl.f_padding)), wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src))));
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+      uint32_t t_2;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_2 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_image_config[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
+          if (num_bits_2 == 24) {
+            t_2 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_2 += 8;
+          *scratch |= ((uint64_t)(num_bits_2)) << 56;
+        }
+      }
+      self->private_impl.f_bitmap_info_len = t_2;
+    }
+    if (self->private_impl.f_padding < self->private_impl.f_bitmap_info_len) {
+      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
+      goto exit;
+    }
+    self->private_impl.f_padding -= self->private_impl.f_bitmap_info_len;
+    if (self->private_impl.f_bitmap_info_len == 12) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+        uint32_t t_3;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_3 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_3 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_3;
+            if (num_bits_3 == 8) {
+              t_3 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_3 += 8;
+            *scratch |= ((uint64_t)(num_bits_3)) << 56;
+          }
+        }
+        self->private_impl.f_width = t_3;
+      }
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
+        uint32_t t_4;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_4 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
+            if (num_bits_4 == 8) {
+              t_4 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_4 += 8;
+            *scratch |= ((uint64_t)(num_bits_4)) << 56;
+          }
+        }
+        self->private_impl.f_height = t_4;
+      }
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(12);
+        uint32_t t_5;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_5 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(13);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_5 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_5;
+            if (num_bits_5 == 8) {
+              t_5 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_5 += 8;
+            *scratch |= ((uint64_t)(num_bits_5)) << 56;
+          }
+        }
+        v_planes = t_5;
+      }
+      if (v_planes != 1) {
+        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+        goto exit;
+      }
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
+        uint32_t t_6;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_6 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(15);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_6 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_6;
+            if (num_bits_6 == 8) {
+              t_6 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_6 += 8;
+            *scratch |= ((uint64_t)(num_bits_6)) << 56;
+          }
+        }
+        self->private_impl.f_bits_per_pixel = t_6;
+      }
+    } else if (self->private_impl.f_bitmap_info_len == 16) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
+        uint32_t t_7;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+          t_7 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+          iop_a_src += 4;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(17);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_7 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_7;
+            if (num_bits_7 == 24) {
+              t_7 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_7 += 8;
+            *scratch |= ((uint64_t)(num_bits_7)) << 56;
+          }
+        }
+        v_width = t_7;
+      }
+      if (v_width >= 2147483648) {
+        status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
+        goto exit;
+      }
+      self->private_impl.f_width = v_width;
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(18);
+        uint32_t t_8;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+          t_8 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+          iop_a_src += 4;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(19);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_8 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_8;
+            if (num_bits_8 == 24) {
+              t_8 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_8 += 8;
+            *scratch |= ((uint64_t)(num_bits_8)) << 56;
+          }
+        }
+        v_height = t_8;
+      }
+      if (v_height >= 2147483648) {
+        status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
+        goto exit;
+      }
+      self->private_impl.f_height = v_height;
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(20);
+        uint32_t t_9;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_9 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(21);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_9 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_9;
+            if (num_bits_9 == 8) {
+              t_9 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_9 += 8;
+            *scratch |= ((uint64_t)(num_bits_9)) << 56;
+          }
+        }
+        v_planes = t_9;
+      }
+      if (v_planes != 1) {
+        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+        goto exit;
+      }
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(22);
+        uint32_t t_10;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_10 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(23);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_10 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_10;
+            if (num_bits_10 == 8) {
+              t_10 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_10 += 8;
+            *scratch |= ((uint64_t)(num_bits_10)) << 56;
+          }
+        }
+        self->private_impl.f_bits_per_pixel = t_10;
+      }
+    } else {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(24);
+        uint32_t t_11;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+          t_11 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+          iop_a_src += 4;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(25);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_11 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_11;
+            if (num_bits_11 == 24) {
+              t_11 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_11 += 8;
+            *scratch |= ((uint64_t)(num_bits_11)) << 56;
+          }
+        }
+        v_width = t_11;
+      }
+      if (v_width >= 2147483648) {
+        status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
+        goto exit;
+      }
+      self->private_impl.f_width = v_width;
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(26);
+        uint32_t t_12;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+          t_12 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+          iop_a_src += 4;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(27);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_12 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_12;
+            if (num_bits_12 == 24) {
+              t_12 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_12 += 8;
+            *scratch |= ((uint64_t)(num_bits_12)) << 56;
+          }
+        }
+        v_height = t_12;
+      }
+      if (v_height == 2147483648) {
+        status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
+        goto exit;
+      } else if (v_height >= 2147483648) {
+        self->private_impl.f_height = (((uint32_t)(0 - v_height)) & 2147483647);
+        self->private_impl.f_top_down = true;
+      } else {
+        self->private_impl.f_height = v_height;
+      }
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(28);
+        uint32_t t_13;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_13 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(29);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_13 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_13;
+            if (num_bits_13 == 8) {
+              t_13 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_13 += 8;
+            *scratch |= ((uint64_t)(num_bits_13)) << 56;
+          }
+        }
+        v_planes = t_13;
+      }
+      if (v_planes != 1) {
+        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+        goto exit;
+      }
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(30);
+        uint32_t t_14;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_14 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(31);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_14 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_14;
+            if (num_bits_14 == 8) {
+              t_14 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_14 += 8;
+            *scratch |= ((uint64_t)(num_bits_14)) << 56;
+          }
+        }
+        self->private_impl.f_bits_per_pixel = t_14;
+      }
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(32);
+        uint32_t t_15;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+          t_15 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+          iop_a_src += 4;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(33);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_15 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_15;
+            if (num_bits_15 == 24) {
+              t_15 = ((uint32_t)(*scratch));
+              break;
+            }
+            num_bits_15 += 8;
+            *scratch |= ((uint64_t)(num_bits_15)) << 56;
+          }
+        }
+        self->private_impl.f_compression = t_15;
+      }
+      if (self->private_impl.f_bits_per_pixel == 0) {
+        if (self->private_impl.f_compression == 4) {
+          self->private_impl.f_io_redirect_fourcc = 1246774599;
+          status = wuffs_base__make_status(wuffs_base__note__i_o_redirect);
+          goto ok;
+        } else if (self->private_impl.f_compression == 5) {
+          self->private_impl.f_io_redirect_fourcc = 1347307296;
+          status = wuffs_base__make_status(wuffs_base__note__i_o_redirect);
+          goto ok;
+        }
+        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+        goto exit;
+      }
+      self->private_data.s_decode_image_config[0].scratch = 20;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(34);
+      if (self->private_data.s_decode_image_config[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_decode_image_config[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_decode_image_config[0].scratch;
+      if (self->private_impl.f_bitmap_info_len == 40) {
+        if (self->private_impl.f_bits_per_pixel >= 16) {
+          if (self->private_impl.f_padding >= 16) {
+            self->private_impl.f_bitmap_info_len = 56;
+            self->private_impl.f_padding -= 16;
+          } else if (self->private_impl.f_padding >= 12) {
+            self->private_impl.f_bitmap_info_len = 52;
+            self->private_impl.f_padding -= 12;
+          }
+        }
+      } else if ((self->private_impl.f_bitmap_info_len != 52) &&
+          (self->private_impl.f_bitmap_info_len != 56) &&
+          (self->private_impl.f_bitmap_info_len != 64) &&
+          (self->private_impl.f_bitmap_info_len != 108) &&
+          (self->private_impl.f_bitmap_info_len != 124)) {
+        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+        goto exit;
+      }
+      if (self->private_impl.f_compression == 6) {
+        self->private_impl.f_compression = 3;
+      }
+      if (self->private_impl.f_compression == 3) {
+        if (self->private_impl.f_bitmap_info_len >= 52) {
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(35);
+            uint32_t t_16;
+            if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+              t_16 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+              iop_a_src += 4;
+            } else {
+              self->private_data.s_decode_image_config[0].scratch = 0;
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(36);
+              while (true) {
+                if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                  goto suspend;
+                }
+                uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+                uint32_t num_bits_16 = ((uint32_t)(*scratch >> 56));
+                *scratch <<= 8;
+                *scratch >>= 8;
+                *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_16;
+                if (num_bits_16 == 24) {
+                  t_16 = ((uint32_t)(*scratch));
+                  break;
+                }
+                num_bits_16 += 8;
+                *scratch |= ((uint64_t)(num_bits_16)) << 56;
+              }
+            }
+            self->private_impl.f_channel_masks[2] = t_16;
+          }
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(37);
+            uint32_t t_17;
+            if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+              t_17 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+              iop_a_src += 4;
+            } else {
+              self->private_data.s_decode_image_config[0].scratch = 0;
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(38);
+              while (true) {
+                if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                  goto suspend;
+                }
+                uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+                uint32_t num_bits_17 = ((uint32_t)(*scratch >> 56));
+                *scratch <<= 8;
+                *scratch >>= 8;
+                *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_17;
+                if (num_bits_17 == 24) {
+                  t_17 = ((uint32_t)(*scratch));
+                  break;
+                }
+                num_bits_17 += 8;
+                *scratch |= ((uint64_t)(num_bits_17)) << 56;
+              }
+            }
+            self->private_impl.f_channel_masks[1] = t_17;
+          }
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(39);
+            uint32_t t_18;
+            if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+              t_18 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+              iop_a_src += 4;
+            } else {
+              self->private_data.s_decode_image_config[0].scratch = 0;
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(40);
+              while (true) {
+                if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                  goto suspend;
+                }
+                uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+                uint32_t num_bits_18 = ((uint32_t)(*scratch >> 56));
+                *scratch <<= 8;
+                *scratch >>= 8;
+                *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_18;
+                if (num_bits_18 == 24) {
+                  t_18 = ((uint32_t)(*scratch));
+                  break;
+                }
+                num_bits_18 += 8;
+                *scratch |= ((uint64_t)(num_bits_18)) << 56;
+              }
+            }
+            self->private_impl.f_channel_masks[0] = t_18;
+          }
+          if (self->private_impl.f_bitmap_info_len >= 56) {
+            {
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(41);
+              uint32_t t_19;
+              if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+                t_19 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+                iop_a_src += 4;
+              } else {
+                self->private_data.s_decode_image_config[0].scratch = 0;
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT(42);
+                while (true) {
+                  if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                    status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                    goto suspend;
+                  }
+                  uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+                  uint32_t num_bits_19 = ((uint32_t)(*scratch >> 56));
+                  *scratch <<= 8;
+                  *scratch >>= 8;
+                  *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_19;
+                  if (num_bits_19 == 24) {
+                    t_19 = ((uint32_t)(*scratch));
+                    break;
+                  }
+                  num_bits_19 += 8;
+                  *scratch |= ((uint64_t)(num_bits_19)) << 56;
+                }
+              }
+              self->private_impl.f_channel_masks[3] = t_19;
+            }
+            self->private_data.s_decode_image_config[0].scratch = ((uint32_t)(self->private_impl.f_bitmap_info_len - 56));
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(43);
+            if (self->private_data.s_decode_image_config[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+              self->private_data.s_decode_image_config[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+              iop_a_src = io2_a_src;
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            iop_a_src += self->private_data.s_decode_image_config[0].scratch;
+          }
+          if ((self->private_impl.f_channel_masks[0] == 255) && (self->private_impl.f_channel_masks[1] == 65280) && (self->private_impl.f_channel_masks[2] == 16711680)) {
+            if (self->private_impl.f_bits_per_pixel == 24) {
+              self->private_impl.f_compression = 0;
+            } else if (self->private_impl.f_bits_per_pixel == 32) {
+              if ((self->private_impl.f_channel_masks[3] == 0) || (self->private_impl.f_channel_masks[3] == 4278190080)) {
+                self->private_impl.f_compression = 0;
+              }
+            }
+          }
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(44);
+          status = wuffs_bmp__decoder__process_masks(self);
+          if (status.repr) {
+            goto suspend;
+          }
+        }
+      } else if (self->private_impl.f_bitmap_info_len >= 40) {
+        self->private_data.s_decode_image_config[0].scratch = (self->private_impl.f_bitmap_info_len - 40);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(45);
+        if (self->private_data.s_decode_image_config[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+          self->private_data.s_decode_image_config[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+          iop_a_src = io2_a_src;
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        iop_a_src += self->private_data.s_decode_image_config[0].scratch;
+      } else {
+        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+        goto exit;
+      }
+    }
+    if (self->private_impl.f_compression != 3) {
+      if (self->private_impl.f_bits_per_pixel < 16) {
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(46);
+        status = wuffs_bmp__decoder__read_palette(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+      }
+    }
+    if (self->private_impl.f_compression == 0) {
+      if ((self->private_impl.f_bits_per_pixel == 1) || (self->private_impl.f_bits_per_pixel == 2) || (self->private_impl.f_bits_per_pixel == 4)) {
+        self->private_impl.f_src_pixfmt = 2198077448;
+        self->private_impl.f_compression = 256;
+      } else if (self->private_impl.f_bits_per_pixel == 8) {
+        self->private_impl.f_src_pixfmt = 2198077448;
+      } else if (self->private_impl.f_bits_per_pixel == 16) {
+        self->private_impl.f_compression = 3;
+        self->private_impl.f_channel_masks[0] = 31;
+        self->private_impl.f_channel_masks[1] = 992;
+        self->private_impl.f_channel_masks[2] = 31744;
+        self->private_impl.f_channel_masks[3] = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(47);
+        status = wuffs_bmp__decoder__process_masks(self);
+        if (status.repr) {
+          goto suspend;
+        }
+        self->private_impl.f_src_pixfmt = 2164308923;
+      } else if (self->private_impl.f_bits_per_pixel == 24) {
+        self->private_impl.f_src_pixfmt = 2147485832;
+      } else if (self->private_impl.f_bits_per_pixel == 32) {
+        if (self->private_impl.f_channel_masks[3] == 0) {
+          self->private_impl.f_src_pixfmt = 2415954056;
+        } else {
+          self->private_impl.f_src_pixfmt = 2164295816;
+        }
+      } else {
+        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+        goto exit;
+      }
+    } else if (self->private_impl.f_compression == 1) {
+      if (self->private_impl.f_bits_per_pixel == 8) {
+        self->private_impl.f_src_pixfmt = 2198077448;
+      } else {
+        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+        goto exit;
+      }
+    } else if (self->private_impl.f_compression == 2) {
+      if (self->private_impl.f_bits_per_pixel == 4) {
+        self->private_impl.f_src_pixfmt = 2198077448;
+      } else {
+        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+        goto exit;
+      }
+    } else if (self->private_impl.f_compression == 3) {
+      if ((self->private_impl.f_bits_per_pixel == 16) || (self->private_impl.f_bits_per_pixel == 32)) {
+        self->private_impl.f_src_pixfmt = 2164308923;
+      } else {
+        status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+        goto exit;
+      }
+    } else {
+      status = wuffs_base__make_status(wuffs_bmp__error__unsupported_bmp_file);
+      goto exit;
+    }
+    if (((self->private_impl.f_bitmap_info_len < 40) || (self->private_impl.f_bitmap_info_len == 64)) &&
+        (self->private_impl.f_bits_per_pixel != 1) &&
+        (self->private_impl.f_bits_per_pixel != 4) &&
+        (self->private_impl.f_bits_per_pixel != 8) &&
+        (self->private_impl.f_bits_per_pixel != 24)) {
+      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
+      goto exit;
+    }
+    if (self->private_impl.f_bits_per_pixel == 1) {
+      v_byte_width = ((self->private_impl.f_width >> 3) + (((self->private_impl.f_width & 7) + 7) >> 3));
+      self->private_impl.f_pad_per_row = ((4 - (v_byte_width & 3)) & 3);
+    } else if (self->private_impl.f_bits_per_pixel == 2) {
+      v_byte_width = ((self->private_impl.f_width >> 2) + (((self->private_impl.f_width & 3) + 3) >> 2));
+      self->private_impl.f_pad_per_row = ((4 - (v_byte_width & 3)) & 3);
+    } else if (self->private_impl.f_bits_per_pixel == 4) {
+      v_byte_width = ((self->private_impl.f_width >> 1) + (self->private_impl.f_width & 1));
+      self->private_impl.f_pad_per_row = ((4 - (v_byte_width & 3)) & 3);
+    } else if (self->private_impl.f_bits_per_pixel == 8) {
+      self->private_impl.f_pad_per_row = ((4 - (self->private_impl.f_width & 3)) & 3);
+    } else if (self->private_impl.f_bits_per_pixel == 16) {
+      self->private_impl.f_pad_per_row = ((self->private_impl.f_width & 1) * 2);
+    } else if (self->private_impl.f_bits_per_pixel == 24) {
+      self->private_impl.f_pad_per_row = (self->private_impl.f_width & 3);
+    } else if (self->private_impl.f_bits_per_pixel == 32) {
+      self->private_impl.f_pad_per_row = 0;
+    }
+    self->private_impl.f_frame_config_io_position = wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)));
+    if (a_dst != NULL) {
+      v_dst_pixfmt = 2164295816;
+      if ((self->private_impl.f_channel_num_bits[0] > 8) ||
+          (self->private_impl.f_channel_num_bits[1] > 8) ||
+          (self->private_impl.f_channel_num_bits[2] > 8) ||
+          (self->private_impl.f_channel_num_bits[3] > 8)) {
+        v_dst_pixfmt = 2164308923;
+      }
+      wuffs_base__image_config__set(
+          a_dst,
+          v_dst_pixfmt,
+          0,
+          self->private_impl.f_width,
+          self->private_impl.f_height,
+          self->private_impl.f_frame_config_io_position,
+          (self->private_impl.f_channel_masks[3] == 0));
+    }
+    self->private_impl.f_call_sequence = 3;
+
+    ok:
+    self->private_impl.p_decode_image_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_image_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func bmp.decoder.decode_frame_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_bmp__decoder__decode_frame_config(
+    wuffs_bmp__decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 2)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence < 3) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_bmp__decoder__decode_image_config(self, NULL, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+    } else if (self->private_impl.f_call_sequence == 3) {
+      if (self->private_impl.f_frame_config_io_position != wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)))) {
+        status = wuffs_base__make_status(wuffs_base__error__bad_restart);
+        goto exit;
+      }
+    } else if (self->private_impl.f_call_sequence == 4) {
+      self->private_impl.f_call_sequence = 255;
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    } else {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    }
+    if (a_dst != NULL) {
+      wuffs_base__frame_config__set(
+          a_dst,
+          wuffs_base__utility__make_rect_ie_u32(
+          0,
+          0,
+          self->private_impl.f_width,
+          self->private_impl.f_height),
+          ((wuffs_base__flicks)(0)),
+          0,
+          self->private_impl.f_frame_config_io_position,
+          0,
+          true,
+          false,
+          4278190080);
+    }
+    self->private_impl.f_call_sequence = 4;
+
+    ok:
+    self->private_impl.p_decode_frame_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_frame_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 2 : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func bmp.decoder.decode_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_bmp__decoder__decode_frame(
+    wuffs_bmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 3)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
+  if (coro_susp_point) {
+    v_status = self->private_data.s_decode_frame[0].v_status;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence < 4) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_bmp__decoder__decode_frame_config(self, NULL, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+    } else if (self->private_impl.f_call_sequence == 4) {
+    } else {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    }
+    self->private_data.s_decode_frame[0].scratch = self->private_impl.f_padding;
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+    if (self->private_data.s_decode_frame[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+      self->private_data.s_decode_frame[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+      iop_a_src = io2_a_src;
+      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+      goto suspend;
+    }
+    iop_a_src += self->private_data.s_decode_frame[0].scratch;
+    if ((self->private_impl.f_width > 0) && (self->private_impl.f_height > 0)) {
+      self->private_impl.f_dst_x = 0;
+      if (self->private_impl.f_top_down) {
+        self->private_impl.f_dst_y = 0;
+        self->private_impl.f_dst_y_inc = 1;
+      } else {
+        self->private_impl.f_dst_y = ((uint32_t)(self->private_impl.f_height - 1));
+        self->private_impl.f_dst_y_inc = 4294967295;
+      }
+      v_status = wuffs_base__pixel_swizzler__prepare(&self->private_impl.f_swizzler,
+          wuffs_base__pixel_buffer__pixel_format(a_dst),
+          wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8((self->private_data.f_scratch) + 1024, 1024)),
+          wuffs_base__utility__make_pixel_format(self->private_impl.f_src_pixfmt),
+          wuffs_base__make_slice_u8(self->private_data.f_src_palette, 1024),
+          a_blend);
+      if ( ! wuffs_base__status__is_ok(&v_status)) {
+        status = v_status;
+        if (wuffs_base__status__is_error(&status)) {
+          goto exit;
+        } else if (wuffs_base__status__is_suspension(&status)) {
+          status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+          goto exit;
+        }
+        goto ok;
+      }
+      while (true) {
+        if (self->private_impl.f_compression == 0) {
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          v_status = wuffs_bmp__decoder__swizzle_none(self, a_dst, a_src);
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+        } else if (self->private_impl.f_compression < 3) {
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          v_status = wuffs_bmp__decoder__swizzle_rle(self, a_dst, a_src);
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+        } else if (self->private_impl.f_compression == 3) {
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          v_status = wuffs_bmp__decoder__swizzle_bitfields(self, a_dst, a_src);
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+        } else {
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          v_status = wuffs_bmp__decoder__swizzle_low_bit_depth(self, a_dst, a_src);
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+        }
+        if (wuffs_base__status__is_ok(&v_status)) {
+          goto label__0__break;
+        } else if (v_status.repr != wuffs_bmp__note__internal_note_short_read) {
+          status = v_status;
+          if (wuffs_base__status__is_error(&status)) {
+            goto exit;
+          } else if (wuffs_base__status__is_suspension(&status)) {
+            status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+            goto exit;
+          }
+          goto ok;
+        }
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+      }
+      label__0__break:;
+      self->private_data.s_decode_frame[0].scratch = self->private_impl.f_pending_pad;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+      if (self->private_data.s_decode_frame[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_decode_frame[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_decode_frame[0].scratch;
+      self->private_impl.f_pending_pad = 0;
+    }
+    self->private_impl.f_call_sequence = 255;
+
+    ok:
+    self->private_impl.p_decode_frame[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 3 : 0;
+  self->private_data.s_decode_frame[0].v_status = v_status;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func bmp.decoder.swizzle_none
+
+static wuffs_base__status
+wuffs_bmp__decoder__swizzle_none(
+    wuffs_bmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  wuffs_base__pixel_format v_dst_pixfmt = {0};
+  uint32_t v_dst_bits_per_pixel = 0;
+  uint64_t v_dst_bytes_per_pixel = 0;
+  uint64_t v_dst_bytes_per_row = 0;
+  wuffs_base__slice_u8 v_dst_palette = {0};
+  wuffs_base__table_u8 v_tab = {0};
+  wuffs_base__slice_u8 v_dst = {0};
+  uint64_t v_i = 0;
+  uint64_t v_n = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
+  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
+  if ((v_dst_bits_per_pixel & 7) != 0) {
+    status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
+    goto exit;
+  }
+  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
+  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
+  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8((self->private_data.f_scratch) + 1024, 1024));
+  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
+  label__outer__continue:;
+  while (true) {
+    while (self->private_impl.f_pending_pad > 0) {
+      if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+        status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
+        goto ok;
+      }
+      self->private_impl.f_pending_pad -= 1;
+      iop_a_src += 1;
+    }
+    label__inner__continue:;
+    while (true) {
+      if (self->private_impl.f_dst_x == self->private_impl.f_width) {
+        self->private_impl.f_dst_x = 0;
+        self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
+        if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
+          if (self->private_impl.f_height > 0) {
+            self->private_impl.f_pending_pad = self->private_impl.f_pad_per_row;
+          }
+          goto label__outer__break;
+        } else if (self->private_impl.f_pad_per_row != 0) {
+          self->private_impl.f_pending_pad = self->private_impl.f_pad_per_row;
+          goto label__outer__continue;
+        }
+      }
+      v_dst = wuffs_base__table_u8__row_u32(v_tab, self->private_impl.f_dst_y);
+      if (v_dst_bytes_per_row < ((uint64_t)(v_dst.len))) {
+        v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row);
+      }
+      v_i = (((uint64_t)(self->private_impl.f_dst_x)) * v_dst_bytes_per_pixel);
+      if (v_i >= ((uint64_t)(v_dst.len))) {
+        goto label__inner__continue;
+      }
+      v_n = wuffs_base__pixel_swizzler__swizzle_interleaved_from_reader(
+          &self->private_impl.f_swizzler,
+          wuffs_base__slice_u8__subslice_i(v_dst, v_i),
+          v_dst_palette,
+          &iop_a_src,
+          io2_a_src);
+      if (v_n == 0) {
+        status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
+        goto ok;
+      }
+      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
+    }
+  }
+  label__outer__break:;
+  status = wuffs_base__make_status(NULL);
+  goto ok;
+
+  ok:
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func bmp.decoder.swizzle_rle
+
+static wuffs_base__status
+wuffs_bmp__decoder__swizzle_rle(
+    wuffs_bmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  wuffs_base__pixel_format v_dst_pixfmt = {0};
+  uint32_t v_dst_bits_per_pixel = 0;
+  uint64_t v_dst_bytes_per_pixel = 0;
+  uint64_t v_dst_bytes_per_row = 0;
+  wuffs_base__slice_u8 v_dst_palette = {0};
+  wuffs_base__table_u8 v_tab = {0};
+  wuffs_base__slice_u8 v_row = {0};
+  wuffs_base__slice_u8 v_dst = {0};
+  uint64_t v_i = 0;
+  uint64_t v_n = 0;
+  uint32_t v_p0 = 0;
+  uint8_t v_code = 0;
+  uint8_t v_indexes[2] = {0};
+  uint32_t v_rle_state = 0;
+  uint32_t v_chunk_bits = 0;
+  uint32_t v_chunk_count = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
+  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
+  if ((v_dst_bits_per_pixel & 7) != 0) {
+    status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
+    goto exit;
+  }
+  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
+  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
+  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8((self->private_data.f_scratch) + 1024, 1024));
+  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
+  v_rle_state = self->private_impl.f_rle_state;
+  label__outer__continue:;
+  while (true) {
+    v_row = wuffs_base__table_u8__row_u32(v_tab, self->private_impl.f_dst_y);
+    if (v_dst_bytes_per_row < ((uint64_t)(v_row.len))) {
+      v_row = wuffs_base__slice_u8__subslice_j(v_row, v_dst_bytes_per_row);
+    }
+    label__middle__continue:;
+    while (true) {
+      v_i = (((uint64_t)(self->private_impl.f_dst_x)) * v_dst_bytes_per_pixel);
+      if (v_i <= ((uint64_t)(v_row.len))) {
+        v_dst = wuffs_base__slice_u8__subslice_i(v_row, v_i);
+      } else {
+        v_dst = wuffs_base__utility__empty_slice_u8();
+      }
+      while (true) {
+        label__inner__continue:;
+        while (true) {
+          if (v_rle_state == 0) {
+            if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
+              goto label__goto_suspend__break;
+            }
+            v_code = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+            iop_a_src += 1;
+            if (v_code == 0) {
+              v_rle_state = 2;
+              goto label__inner__continue;
+            }
+            self->private_impl.f_rle_length = ((uint32_t)(v_code));
+            v_rle_state = 1;
+            goto label__inner__continue;
+          } else if (v_rle_state == 1) {
+            if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
+              goto label__goto_suspend__break;
+            }
+            v_code = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+            iop_a_src += 1;
+            if (self->private_impl.f_bits_per_pixel == 8) {
+              v_p0 = 0;
+              while (v_p0 < self->private_impl.f_rle_length) {
+                self->private_data.f_scratch[v_p0] = v_code;
+                v_p0 += 1;
+              }
+            } else {
+              v_indexes[0] = ((uint8_t)((v_code >> 4)));
+              v_indexes[1] = (v_code & 15);
+              v_p0 = 0;
+              while (v_p0 < self->private_impl.f_rle_length) {
+                self->private_data.f_scratch[(v_p0 + 0)] = v_indexes[0];
+                self->private_data.f_scratch[(v_p0 + 1)] = v_indexes[1];
+                v_p0 += 2;
+              }
+            }
+            wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, v_dst_palette, wuffs_base__slice_u8__subslice_j(wuffs_base__make_slice_u8(self->private_data.f_scratch, 2048), self->private_impl.f_rle_length));
+            wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, self->private_impl.f_rle_length);
+            v_rle_state = 0;
+            goto label__middle__continue;
+          } else if (v_rle_state == 2) {
+            if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
+              goto label__goto_suspend__break;
+            }
+            v_code = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+            iop_a_src += 1;
+            if (v_code < 2) {
+              if ((self->private_impl.f_dst_y >= self->private_impl.f_height) && (v_code == 0)) {
+                status = wuffs_base__make_status(wuffs_bmp__error__bad_rle_compression);
+                goto exit;
+              }
+              wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(&self->private_impl.f_swizzler, v_dst, v_dst_palette, 18446744073709551615u);
+              self->private_impl.f_dst_x = 0;
+              self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
+              if (v_code > 0) {
+                goto label__outer__break;
+              }
+              v_rle_state = 0;
+              goto label__outer__continue;
+            } else if (v_code == 2) {
+              v_rle_state = 4;
+              goto label__inner__continue;
+            }
+            self->private_impl.f_rle_length = ((uint32_t)(v_code));
+            self->private_impl.f_rle_padded = ((self->private_impl.f_bits_per_pixel == 8) && ((v_code & 1) != 0));
+            v_rle_state = 3;
+            goto label__inner__continue;
+          } else if (v_rle_state == 3) {
+            if (self->private_impl.f_bits_per_pixel == 8) {
+              v_n = wuffs_base__pixel_swizzler__limited_swizzle_u32_interleaved_from_reader(
+                  &self->private_impl.f_swizzler,
+                  self->private_impl.f_rle_length,
+                  v_dst,
+                  v_dst_palette,
+                  &iop_a_src,
+                  io2_a_src);
+              wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
+              wuffs_base__u32__sat_sub_indirect(&self->private_impl.f_rle_length, ((uint32_t)((v_n & 4294967295))));
+            } else {
+              v_chunk_count = ((self->private_impl.f_rle_length + 3) / 4);
+              v_p0 = 0;
+              while ((v_chunk_count > 0) && (((uint64_t)(io2_a_src - iop_a_src)) >= 2)) {
+                v_chunk_bits = ((uint32_t)(wuffs_base__peek_u16be__no_bounds_check(iop_a_src)));
+                iop_a_src += 2;
+                self->private_data.f_scratch[(v_p0 + 0)] = ((uint8_t)((15 & (v_chunk_bits >> 12))));
+                self->private_data.f_scratch[(v_p0 + 1)] = ((uint8_t)((15 & (v_chunk_bits >> 8))));
+                self->private_data.f_scratch[(v_p0 + 2)] = ((uint8_t)((15 & (v_chunk_bits >> 4))));
+                self->private_data.f_scratch[(v_p0 + 3)] = ((uint8_t)((15 & (v_chunk_bits >> 0))));
+                v_p0 = ((v_p0 & 255) + 4);
+                v_chunk_count -= 1;
+              }
+              v_p0 = wuffs_base__u32__min(v_p0, self->private_impl.f_rle_length);
+              wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, v_dst_palette, wuffs_base__slice_u8__subslice_j(wuffs_base__make_slice_u8(self->private_data.f_scratch, 2048), v_p0));
+              wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, v_p0);
+              wuffs_base__u32__sat_sub_indirect(&self->private_impl.f_rle_length, v_p0);
+            }
+            if (self->private_impl.f_rle_length > 0) {
+              goto label__goto_suspend__break;
+            }
+            if (self->private_impl.f_rle_padded) {
+              if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
+                goto label__goto_suspend__break;
+              }
+              iop_a_src += 1;
+              self->private_impl.f_rle_padded = false;
+            }
+            v_rle_state = 0;
+            goto label__middle__continue;
+          } else if (v_rle_state == 4) {
+            if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
+              goto label__goto_suspend__break;
+            }
+            self->private_impl.f_rle_delta_x = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+            iop_a_src += 1;
+            v_rle_state = 5;
+            goto label__inner__continue;
+          }
+          if (((uint64_t)(io2_a_src - iop_a_src)) < 1) {
+            goto label__goto_suspend__break;
+          }
+          v_code = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+          iop_a_src += 1;
+          if (self->private_impl.f_rle_delta_x > 0) {
+            wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(&self->private_impl.f_swizzler, v_dst, v_dst_palette, ((uint64_t)(self->private_impl.f_rle_delta_x)));
+            wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)(self->private_impl.f_rle_delta_x)));
+            self->private_impl.f_rle_delta_x = 0;
+            if (self->private_impl.f_dst_x > self->private_impl.f_width) {
+              status = wuffs_base__make_status(wuffs_bmp__error__bad_rle_compression);
+              goto exit;
+            }
+          }
+          if (v_code > 0) {
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+            v_code -= 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+            while (true) {
+              self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
+              if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
+                status = wuffs_base__make_status(wuffs_bmp__error__bad_rle_compression);
+                goto exit;
+              }
+              v_row = wuffs_base__table_u8__row_u32(v_tab, self->private_impl.f_dst_y);
+              if (v_dst_bytes_per_row < ((uint64_t)(v_row.len))) {
+                v_row = wuffs_base__slice_u8__subslice_j(v_row, v_dst_bytes_per_row);
+              }
+              if (v_code <= 0) {
+                wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(&self->private_impl.f_swizzler, v_row, v_dst_palette, ((uint64_t)(self->private_impl.f_dst_x)));
+                goto label__0__break;
+              }
+              wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(&self->private_impl.f_swizzler, v_row, v_dst_palette, 18446744073709551615u);
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+              v_code -= 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+            }
+            label__0__break:;
+          }
+          v_rle_state = 0;
+          goto label__middle__continue;
+        }
+      }
+      label__goto_suspend__break:;
+      self->private_impl.f_rle_state = v_rle_state;
+      status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
+      goto ok;
+    }
+  }
+  label__outer__break:;
+  while (self->private_impl.f_dst_y < self->private_impl.f_height) {
+    v_row = wuffs_base__table_u8__row_u32(v_tab, self->private_impl.f_dst_y);
+    if (v_dst_bytes_per_row < ((uint64_t)(v_row.len))) {
+      v_row = wuffs_base__slice_u8__subslice_j(v_row, v_dst_bytes_per_row);
+    }
+    wuffs_base__pixel_swizzler__swizzle_interleaved_transparent_black(&self->private_impl.f_swizzler, v_row, v_dst_palette, 18446744073709551615u);
+    self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
+  }
+  status = wuffs_base__make_status(NULL);
+  goto ok;
+
+  ok:
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func bmp.decoder.swizzle_bitfields
+
+static wuffs_base__status
+wuffs_bmp__decoder__swizzle_bitfields(
+    wuffs_bmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  wuffs_base__pixel_format v_dst_pixfmt = {0};
+  uint32_t v_dst_bits_per_pixel = 0;
+  uint64_t v_dst_bytes_per_pixel = 0;
+  uint64_t v_dst_bytes_per_row = 0;
+  wuffs_base__slice_u8 v_dst_palette = {0};
+  wuffs_base__table_u8 v_tab = {0};
+  wuffs_base__slice_u8 v_dst = {0};
+  uint64_t v_i = 0;
+  uint64_t v_n = 0;
+  uint32_t v_p0 = 0;
+  uint32_t v_p1 = 0;
+  uint32_t v_p1_temp = 0;
+  uint32_t v_num_bits = 0;
+  uint32_t v_c = 0;
+  uint32_t v_c32 = 0;
+  uint32_t v_channel = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
+  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
+  if ((v_dst_bits_per_pixel & 7) != 0) {
+    status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
+    goto exit;
+  }
+  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
+  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
+  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8((self->private_data.f_scratch) + 1024, 1024));
+  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
+  label__outer__continue:;
+  while (true) {
+    while (self->private_impl.f_pending_pad > 0) {
+      if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+        status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
+        goto ok;
+      }
+      self->private_impl.f_pending_pad -= 1;
+      iop_a_src += 1;
+    }
+    label__inner__continue:;
+    while (true) {
+      if (self->private_impl.f_dst_x == self->private_impl.f_width) {
+        self->private_impl.f_dst_x = 0;
+        self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
+        if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
+          if (self->private_impl.f_height > 0) {
+            self->private_impl.f_pending_pad = self->private_impl.f_pad_per_row;
+          }
+          goto label__outer__break;
+        } else if (self->private_impl.f_pad_per_row != 0) {
+          self->private_impl.f_pending_pad = self->private_impl.f_pad_per_row;
+          goto label__outer__continue;
+        }
+      }
+      v_p1_temp = ((uint32_t)(self->private_impl.f_width - self->private_impl.f_dst_x));
+      v_p1 = wuffs_base__u32__min(v_p1_temp, 256);
+      v_p0 = 0;
+      while (v_p0 < v_p1) {
+        if (self->private_impl.f_bits_per_pixel == 16) {
+          if (((uint64_t)(io2_a_src - iop_a_src)) < 2) {
+            goto label__0__break;
+          }
+          v_c32 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+          iop_a_src += 2;
+        } else {
+          if (((uint64_t)(io2_a_src - iop_a_src)) < 4) {
+            goto label__0__break;
+          }
+          v_c32 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+          iop_a_src += 4;
+        }
+        v_channel = 0;
+        while (v_channel < 4) {
+          if (self->private_impl.f_channel_num_bits[v_channel] == 0) {
+            self->private_data.f_scratch[((8 * v_p0) + (2 * v_channel) + 0)] = 255;
+            self->private_data.f_scratch[((8 * v_p0) + (2 * v_channel) + 1)] = 255;
+          } else {
+            v_c = ((v_c32 & self->private_impl.f_channel_masks[v_channel]) >> self->private_impl.f_channel_shifts[v_channel]);
+            v_num_bits = ((uint32_t)(self->private_impl.f_channel_num_bits[v_channel]));
+            while (v_num_bits < 16) {
+              v_c |= ((uint32_t)(v_c << v_num_bits));
+              v_num_bits *= 2;
+            }
+            v_c >>= (v_num_bits - 16);
+            self->private_data.f_scratch[((8 * v_p0) + (2 * v_channel) + 0)] = ((uint8_t)((255 & (v_c >> 0))));
+            self->private_data.f_scratch[((8 * v_p0) + (2 * v_channel) + 1)] = ((uint8_t)((255 & (v_c >> 8))));
+          }
+          v_channel += 1;
+        }
+        v_p0 += 1;
+      }
+      label__0__break:;
+      v_dst = wuffs_base__table_u8__row_u32(v_tab, self->private_impl.f_dst_y);
+      if (v_dst_bytes_per_row < ((uint64_t)(v_dst.len))) {
+        v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row);
+      }
+      v_i = (((uint64_t)(self->private_impl.f_dst_x)) * v_dst_bytes_per_pixel);
+      if (v_i >= ((uint64_t)(v_dst.len))) {
+        goto label__inner__continue;
+      }
+      v_n = wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__slice_u8__subslice_j(wuffs_base__make_slice_u8(self->private_data.f_scratch, 2048), (8 * v_p0)));
+      if (v_n == 0) {
+        status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
+        goto ok;
+      }
+      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
+    }
+  }
+  label__outer__break:;
+  status = wuffs_base__make_status(NULL);
+  goto ok;
+
+  ok:
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func bmp.decoder.swizzle_low_bit_depth
+
+static wuffs_base__status
+wuffs_bmp__decoder__swizzle_low_bit_depth(
+    wuffs_bmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  wuffs_base__pixel_format v_dst_pixfmt = {0};
+  uint32_t v_dst_bits_per_pixel = 0;
+  uint64_t v_dst_bytes_per_pixel = 0;
+  uint64_t v_dst_bytes_per_row = 0;
+  wuffs_base__slice_u8 v_dst_palette = {0};
+  wuffs_base__table_u8 v_tab = {0};
+  wuffs_base__slice_u8 v_dst = {0};
+  uint64_t v_i = 0;
+  uint64_t v_n = 0;
+  uint32_t v_p0 = 0;
+  uint32_t v_chunk_bits = 0;
+  uint32_t v_chunk_count = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
+  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
+  if ((v_dst_bits_per_pixel & 7) != 0) {
+    status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
+    goto exit;
+  }
+  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
+  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
+  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8((self->private_data.f_scratch) + 1024, 1024));
+  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
+  label__loop__continue:;
+  while (true) {
+    if (self->private_impl.f_dst_x == self->private_impl.f_width) {
+      self->private_impl.f_dst_x = 0;
+      self->private_impl.f_dst_y += self->private_impl.f_dst_y_inc;
+      if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
+        goto label__loop__break;
+      }
+    }
+    v_dst = wuffs_base__table_u8__row_u32(v_tab, self->private_impl.f_dst_y);
+    if (v_dst_bytes_per_row < ((uint64_t)(v_dst.len))) {
+      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row);
+    }
+    v_i = (((uint64_t)(self->private_impl.f_dst_x)) * v_dst_bytes_per_pixel);
+    if (v_i >= ((uint64_t)(v_dst.len))) {
+      goto label__loop__continue;
+    }
+    v_dst = wuffs_base__slice_u8__subslice_i(v_dst, v_i);
+    v_p0 = 0;
+    if (self->private_impl.f_bits_per_pixel == 1) {
+      v_chunk_count = ((wuffs_base__u32__sat_sub(self->private_impl.f_width, self->private_impl.f_dst_x) + 31) / 32);
+      v_chunk_count = wuffs_base__u32__min(v_chunk_count, 16);
+      while ((v_chunk_count > 0) && (((uint64_t)(io2_a_src - iop_a_src)) >= 4)) {
+        v_chunk_bits = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+        self->private_data.f_scratch[(v_p0 + 0)] = ((uint8_t)((1 & (v_chunk_bits >> 31))));
+        self->private_data.f_scratch[(v_p0 + 1)] = ((uint8_t)((1 & (v_chunk_bits >> 30))));
+        self->private_data.f_scratch[(v_p0 + 2)] = ((uint8_t)((1 & (v_chunk_bits >> 29))));
+        self->private_data.f_scratch[(v_p0 + 3)] = ((uint8_t)((1 & (v_chunk_bits >> 28))));
+        self->private_data.f_scratch[(v_p0 + 4)] = ((uint8_t)((1 & (v_chunk_bits >> 27))));
+        self->private_data.f_scratch[(v_p0 + 5)] = ((uint8_t)((1 & (v_chunk_bits >> 26))));
+        self->private_data.f_scratch[(v_p0 + 6)] = ((uint8_t)((1 & (v_chunk_bits >> 25))));
+        self->private_data.f_scratch[(v_p0 + 7)] = ((uint8_t)((1 & (v_chunk_bits >> 24))));
+        self->private_data.f_scratch[(v_p0 + 8)] = ((uint8_t)((1 & (v_chunk_bits >> 23))));
+        self->private_data.f_scratch[(v_p0 + 9)] = ((uint8_t)((1 & (v_chunk_bits >> 22))));
+        self->private_data.f_scratch[(v_p0 + 10)] = ((uint8_t)((1 & (v_chunk_bits >> 21))));
+        self->private_data.f_scratch[(v_p0 + 11)] = ((uint8_t)((1 & (v_chunk_bits >> 20))));
+        self->private_data.f_scratch[(v_p0 + 12)] = ((uint8_t)((1 & (v_chunk_bits >> 19))));
+        self->private_data.f_scratch[(v_p0 + 13)] = ((uint8_t)((1 & (v_chunk_bits >> 18))));
+        self->private_data.f_scratch[(v_p0 + 14)] = ((uint8_t)((1 & (v_chunk_bits >> 17))));
+        self->private_data.f_scratch[(v_p0 + 15)] = ((uint8_t)((1 & (v_chunk_bits >> 16))));
+        self->private_data.f_scratch[(v_p0 + 16)] = ((uint8_t)((1 & (v_chunk_bits >> 15))));
+        self->private_data.f_scratch[(v_p0 + 17)] = ((uint8_t)((1 & (v_chunk_bits >> 14))));
+        self->private_data.f_scratch[(v_p0 + 18)] = ((uint8_t)((1 & (v_chunk_bits >> 13))));
+        self->private_data.f_scratch[(v_p0 + 19)] = ((uint8_t)((1 & (v_chunk_bits >> 12))));
+        self->private_data.f_scratch[(v_p0 + 20)] = ((uint8_t)((1 & (v_chunk_bits >> 11))));
+        self->private_data.f_scratch[(v_p0 + 21)] = ((uint8_t)((1 & (v_chunk_bits >> 10))));
+        self->private_data.f_scratch[(v_p0 + 22)] = ((uint8_t)((1 & (v_chunk_bits >> 9))));
+        self->private_data.f_scratch[(v_p0 + 23)] = ((uint8_t)((1 & (v_chunk_bits >> 8))));
+        self->private_data.f_scratch[(v_p0 + 24)] = ((uint8_t)((1 & (v_chunk_bits >> 7))));
+        self->private_data.f_scratch[(v_p0 + 25)] = ((uint8_t)((1 & (v_chunk_bits >> 6))));
+        self->private_data.f_scratch[(v_p0 + 26)] = ((uint8_t)((1 & (v_chunk_bits >> 5))));
+        self->private_data.f_scratch[(v_p0 + 27)] = ((uint8_t)((1 & (v_chunk_bits >> 4))));
+        self->private_data.f_scratch[(v_p0 + 28)] = ((uint8_t)((1 & (v_chunk_bits >> 3))));
+        self->private_data.f_scratch[(v_p0 + 29)] = ((uint8_t)((1 & (v_chunk_bits >> 2))));
+        self->private_data.f_scratch[(v_p0 + 30)] = ((uint8_t)((1 & (v_chunk_bits >> 1))));
+        self->private_data.f_scratch[(v_p0 + 31)] = ((uint8_t)((1 & (v_chunk_bits >> 0))));
+        v_p0 = ((v_p0 & 511) + 32);
+        v_chunk_count -= 1;
+      }
+    } else if (self->private_impl.f_bits_per_pixel == 2) {
+      v_chunk_count = ((wuffs_base__u32__sat_sub(self->private_impl.f_width, self->private_impl.f_dst_x) + 15) / 16);
+      v_chunk_count = wuffs_base__u32__min(v_chunk_count, 32);
+      while ((v_chunk_count > 0) && (((uint64_t)(io2_a_src - iop_a_src)) >= 4)) {
+        v_chunk_bits = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+        self->private_data.f_scratch[(v_p0 + 0)] = ((uint8_t)((3 & (v_chunk_bits >> 30))));
+        self->private_data.f_scratch[(v_p0 + 1)] = ((uint8_t)((3 & (v_chunk_bits >> 28))));
+        self->private_data.f_scratch[(v_p0 + 2)] = ((uint8_t)((3 & (v_chunk_bits >> 26))));
+        self->private_data.f_scratch[(v_p0 + 3)] = ((uint8_t)((3 & (v_chunk_bits >> 24))));
+        self->private_data.f_scratch[(v_p0 + 4)] = ((uint8_t)((3 & (v_chunk_bits >> 22))));
+        self->private_data.f_scratch[(v_p0 + 5)] = ((uint8_t)((3 & (v_chunk_bits >> 20))));
+        self->private_data.f_scratch[(v_p0 + 6)] = ((uint8_t)((3 & (v_chunk_bits >> 18))));
+        self->private_data.f_scratch[(v_p0 + 7)] = ((uint8_t)((3 & (v_chunk_bits >> 16))));
+        self->private_data.f_scratch[(v_p0 + 8)] = ((uint8_t)((3 & (v_chunk_bits >> 14))));
+        self->private_data.f_scratch[(v_p0 + 9)] = ((uint8_t)((3 & (v_chunk_bits >> 12))));
+        self->private_data.f_scratch[(v_p0 + 10)] = ((uint8_t)((3 & (v_chunk_bits >> 10))));
+        self->private_data.f_scratch[(v_p0 + 11)] = ((uint8_t)((3 & (v_chunk_bits >> 8))));
+        self->private_data.f_scratch[(v_p0 + 12)] = ((uint8_t)((3 & (v_chunk_bits >> 6))));
+        self->private_data.f_scratch[(v_p0 + 13)] = ((uint8_t)((3 & (v_chunk_bits >> 4))));
+        self->private_data.f_scratch[(v_p0 + 14)] = ((uint8_t)((3 & (v_chunk_bits >> 2))));
+        self->private_data.f_scratch[(v_p0 + 15)] = ((uint8_t)((3 & (v_chunk_bits >> 0))));
+        v_p0 = ((v_p0 & 511) + 16);
+        v_chunk_count -= 1;
+      }
+    } else if (self->private_impl.f_bits_per_pixel == 4) {
+      v_chunk_count = ((wuffs_base__u32__sat_sub(self->private_impl.f_width, self->private_impl.f_dst_x) + 7) / 8);
+      v_chunk_count = wuffs_base__u32__min(v_chunk_count, 64);
+      while ((v_chunk_count > 0) && (((uint64_t)(io2_a_src - iop_a_src)) >= 4)) {
+        v_chunk_bits = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+        self->private_data.f_scratch[(v_p0 + 0)] = ((uint8_t)((15 & (v_chunk_bits >> 28))));
+        self->private_data.f_scratch[(v_p0 + 1)] = ((uint8_t)((15 & (v_chunk_bits >> 24))));
+        self->private_data.f_scratch[(v_p0 + 2)] = ((uint8_t)((15 & (v_chunk_bits >> 20))));
+        self->private_data.f_scratch[(v_p0 + 3)] = ((uint8_t)((15 & (v_chunk_bits >> 16))));
+        self->private_data.f_scratch[(v_p0 + 4)] = ((uint8_t)((15 & (v_chunk_bits >> 12))));
+        self->private_data.f_scratch[(v_p0 + 5)] = ((uint8_t)((15 & (v_chunk_bits >> 8))));
+        self->private_data.f_scratch[(v_p0 + 6)] = ((uint8_t)((15 & (v_chunk_bits >> 4))));
+        self->private_data.f_scratch[(v_p0 + 7)] = ((uint8_t)((15 & (v_chunk_bits >> 0))));
+        v_p0 = ((v_p0 & 511) + 8);
+        v_chunk_count -= 1;
+      }
+    }
+    v_p0 = wuffs_base__u32__min(v_p0, wuffs_base__u32__sat_sub(self->private_impl.f_width, self->private_impl.f_dst_x));
+    v_n = wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, v_dst_palette, wuffs_base__slice_u8__subslice_j(wuffs_base__make_slice_u8(self->private_data.f_scratch, 2048), v_p0));
+    if (v_n == 0) {
+      status = wuffs_base__make_status(wuffs_bmp__note__internal_note_short_read);
+      goto ok;
+    }
+    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
+  }
+  label__loop__break:;
+  status = wuffs_base__make_status(NULL);
+  goto ok;
+
+  ok:
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func bmp.decoder.frame_dirty_rect
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_bmp__decoder__frame_dirty_rect(
+    const wuffs_bmp__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+
+  return wuffs_base__utility__make_rect_ie_u32(
+      0,
+      0,
+      self->private_impl.f_width,
+      self->private_impl.f_height);
+}
+
+// -------- func bmp.decoder.num_animation_loops
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_bmp__decoder__num_animation_loops(
+    const wuffs_bmp__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return 0;
+}
+
+// -------- func bmp.decoder.num_decoded_frame_configs
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_bmp__decoder__num_decoded_frame_configs(
+    const wuffs_bmp__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  if (self->private_impl.f_call_sequence > 3) {
+    return 1;
+  }
+  return 0;
+}
+
+// -------- func bmp.decoder.num_decoded_frames
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_bmp__decoder__num_decoded_frames(
+    const wuffs_bmp__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  if (self->private_impl.f_call_sequence > 4) {
+    return 1;
+  }
+  return 0;
+}
+
+// -------- func bmp.decoder.restart_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_bmp__decoder__restart_frame(
+    wuffs_bmp__decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+
+  if (self->private_impl.f_call_sequence < 3) {
+    return wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+  }
+  if (a_index != 0) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  self->private_impl.f_call_sequence = 3;
+  self->private_impl.f_frame_config_io_position = a_io_position;
+  return wuffs_base__make_status(NULL);
+}
+
+// -------- func bmp.decoder.set_report_metadata
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_bmp__decoder__set_report_metadata(
+    wuffs_bmp__decoder* self,
+    uint32_t a_fourcc,
+    bool a_report) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func bmp.decoder.tell_me_more
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_bmp__decoder__tell_me_more(
+    wuffs_bmp__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 4)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  if (self->private_impl.f_io_redirect_fourcc <= 1) {
+    status = wuffs_base__make_status(wuffs_base__error__no_more_information);
+    goto exit;
+  }
+  if (a_minfo != NULL) {
+    wuffs_base__more_information__set(a_minfo,
+        1,
+        self->private_impl.f_io_redirect_fourcc,
+        0,
+        self->private_impl.f_io_redirect_pos,
+        18446744073709551615u);
+  }
+  self->private_impl.f_io_redirect_fourcc = 1;
+
+  goto ok;
+  ok:
+  goto exit;
+  exit:
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func bmp.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_bmp__decoder__workbuf_len(
+    const wuffs_bmp__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(0, 0);
+}
+
+// -------- func bmp.decoder.read_palette
+
+static wuffs_base__status
+wuffs_bmp__decoder__read_palette(
+    wuffs_bmp__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_i = 0;
+  uint32_t v_argb = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_read_palette[0];
+  if (coro_susp_point) {
+    v_i = self->private_data.s_read_palette[0].v_i;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_bitmap_info_len == 12) {
+      while ((v_i < 256) && (self->private_impl.f_padding >= 3)) {
+        self->private_impl.f_padding -= 3;
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+          uint32_t t_0;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
+            t_0 = ((uint32_t)(wuffs_base__peek_u24le__no_bounds_check(iop_a_src)));
+            iop_a_src += 3;
+          } else {
+            self->private_data.s_read_palette[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_read_palette[0].scratch;
+              uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
+              *scratch <<= 8;
+              *scratch >>= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
+              if (num_bits_0 == 16) {
+                t_0 = ((uint32_t)(*scratch));
+                break;
+              }
+              num_bits_0 += 8;
+              *scratch |= ((uint64_t)(num_bits_0)) << 56;
+            }
+          }
+          v_argb = t_0;
+        }
+        v_argb |= 4278190080;
+        self->private_data.f_src_palette[((4 * v_i) + 0)] = ((uint8_t)(((v_argb >> 0) & 255)));
+        self->private_data.f_src_palette[((4 * v_i) + 1)] = ((uint8_t)(((v_argb >> 8) & 255)));
+        self->private_data.f_src_palette[((4 * v_i) + 2)] = ((uint8_t)(((v_argb >> 16) & 255)));
+        self->private_data.f_src_palette[((4 * v_i) + 3)] = ((uint8_t)(((v_argb >> 24) & 255)));
+        v_i += 1;
+      }
+    } else {
+      while ((v_i < 256) && (self->private_impl.f_padding >= 4)) {
+        self->private_impl.f_padding -= 4;
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          uint32_t t_1;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_1 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_read_palette[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_read_palette[0].scratch;
+              uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
+              *scratch <<= 8;
+              *scratch >>= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
+              if (num_bits_1 == 24) {
+                t_1 = ((uint32_t)(*scratch));
+                break;
+              }
+              num_bits_1 += 8;
+              *scratch |= ((uint64_t)(num_bits_1)) << 56;
+            }
+          }
+          v_argb = t_1;
+        }
+        v_argb |= 4278190080;
+        self->private_data.f_src_palette[((4 * v_i) + 0)] = ((uint8_t)(((v_argb >> 0) & 255)));
+        self->private_data.f_src_palette[((4 * v_i) + 1)] = ((uint8_t)(((v_argb >> 8) & 255)));
+        self->private_data.f_src_palette[((4 * v_i) + 2)] = ((uint8_t)(((v_argb >> 16) & 255)));
+        self->private_data.f_src_palette[((4 * v_i) + 3)] = ((uint8_t)(((v_argb >> 24) & 255)));
+        v_i += 1;
+      }
+    }
+    while (v_i < 256) {
+      self->private_data.f_src_palette[((4 * v_i) + 0)] = 0;
+      self->private_data.f_src_palette[((4 * v_i) + 1)] = 0;
+      self->private_data.f_src_palette[((4 * v_i) + 2)] = 0;
+      self->private_data.f_src_palette[((4 * v_i) + 3)] = 255;
+      v_i += 1;
+    }
+
+    goto ok;
+    ok:
+    self->private_impl.p_read_palette[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_read_palette[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_read_palette[0].v_i = v_i;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func bmp.decoder.process_masks
+
+static wuffs_base__status
+wuffs_bmp__decoder__process_masks(
+    wuffs_bmp__decoder* self) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_i = 0;
+  uint32_t v_mask = 0;
+  uint32_t v_n = 0;
+
+  while (v_i < 4) {
+    v_mask = self->private_impl.f_channel_masks[v_i];
+    if (v_mask != 0) {
+      v_n = 0;
+      while ((v_mask & 1) == 0) {
+        v_n += 1;
+        v_mask >>= 1;
+      }
+      self->private_impl.f_channel_shifts[v_i] = ((uint8_t)((v_n & 31)));
+      v_n = 0;
+      while ((v_mask & 1) == 1) {
+        v_n += 1;
+        v_mask >>= 1;
+      }
+      if ((v_mask != 0) || (v_n > 32)) {
+        status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
+        goto exit;
+      }
+      self->private_impl.f_channel_num_bits[v_i] = ((uint8_t)(v_n));
+    } else if (v_i != 3) {
+      status = wuffs_base__make_status(wuffs_bmp__error__bad_header);
+      goto exit;
+    }
+    v_i += 1;
+  }
+
+  goto ok;
+  ok:
+  goto exit;
+  exit:
+  return status;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BMP)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__CBOR)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_cbor__error__bad_input[] = "#cbor: bad input";
+const char wuffs_cbor__error__unsupported_recursion_depth[] = "#cbor: unsupported recursion depth";
+const char wuffs_cbor__error__internal_error_inconsistent_i_o[] = "#cbor: internal error: inconsistent I/O";
+const char wuffs_cbor__error__internal_error_inconsistent_token_length[] = "#cbor: internal error: inconsistent token length";
+
+// ---------------- Private Consts
+
+static const uint32_t
+WUFFS_CBOR__LITERALS[4] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  8388612, 8388616, 8388610, 8388609,
+};
+
+static const uint8_t
+WUFFS_CBOR__TOKEN_LENGTHS[32] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,
+  1, 1, 1, 1, 1, 1, 1, 1,
+  2, 3, 5, 9, 0, 0, 0, 1,
+};
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+// ---------------- VTables
+
+const wuffs_base__token_decoder__func_ptrs
+wuffs_cbor__decoder__func_ptrs_for__wuffs_base__token_decoder = {
+  (wuffs_base__status(*)(void*,
+      wuffs_base__token_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__slice_u8))(&wuffs_cbor__decoder__decode_tokens),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_cbor__decoder__set_quirk_enabled),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_cbor__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_cbor__decoder__initialize(
+    wuffs_cbor__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__token_decoder.vtable_name =
+      wuffs_base__token_decoder__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__token_decoder.function_pointers =
+      (const void*)(&wuffs_cbor__decoder__func_ptrs_for__wuffs_base__token_decoder);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_cbor__decoder*
+wuffs_cbor__decoder__alloc() {
+  wuffs_cbor__decoder* x =
+      (wuffs_cbor__decoder*)(calloc(sizeof(wuffs_cbor__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_cbor__decoder__initialize(
+      x, sizeof(wuffs_cbor__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_cbor__decoder() {
+  return sizeof(wuffs_cbor__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func cbor.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_cbor__decoder__set_quirk_enabled(
+    wuffs_cbor__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func cbor.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_cbor__decoder__workbuf_len(
+    const wuffs_cbor__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__empty_range_ii_u64();
+}
+
+// -------- func cbor.decoder.decode_tokens
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_cbor__decoder__decode_tokens(
+    wuffs_cbor__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint64_t v_string_length = 0;
+  uint64_t v_n64 = 0;
+  uint32_t v_depth = 0;
+  uint32_t v_stack_byte = 0;
+  uint32_t v_stack_bit = 0;
+  uint32_t v_stack_val = 0;
+  uint32_t v_token_length = 0;
+  uint32_t v_vminor = 0;
+  uint32_t v_vminor_alt = 0;
+  uint32_t v_continued = 0;
+  uint8_t v_c = 0;
+  uint8_t v_c_major = 0;
+  uint8_t v_c_minor = 0;
+  bool v_tagged = false;
+  uint8_t v_indefinite_string_major_type = 0;
+
+  wuffs_base__token* iop_a_dst = NULL;
+  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_tokens[0];
+  if (coro_susp_point) {
+    v_string_length = self->private_data.s_decode_tokens[0].v_string_length;
+    v_depth = self->private_data.s_decode_tokens[0].v_depth;
+    v_token_length = self->private_data.s_decode_tokens[0].v_token_length;
+    v_tagged = self->private_data.s_decode_tokens[0].v_tagged;
+    v_indefinite_string_major_type = self->private_data.s_decode_tokens[0].v_indefinite_string_major_type;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_end_of_data) {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    }
+    label__outer__continue:;
+    while (true) {
+      while (true) {
+        while (true) {
+          if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 1) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+            goto label__outer__continue;
+          }
+          if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+            if (a_src && a_src->meta.closed) {
+              status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
+              goto exit;
+            }
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+            goto label__outer__continue;
+          }
+          v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+          if ((v_indefinite_string_major_type != 0) && (v_indefinite_string_major_type != (v_c >> 5))) {
+            if (v_c != 255) {
+              status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
+              goto exit;
+            }
+            v_vminor = 4194560;
+            if (v_indefinite_string_major_type == 3) {
+              v_vminor |= 19;
+            }
+            v_indefinite_string_major_type = 0;
+            iop_a_src += 1;
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            goto label__goto_parsed_a_leaf_value__break;
+          }
+          iop_a_src += 1;
+          v_c_major = ((uint8_t)((v_c >> 5)));
+          v_c_minor = (v_c & 31);
+          if (v_c_minor < 24) {
+            v_string_length = ((uint64_t)(v_c_minor));
+          } else {
+            while (true) {
+              if (v_c_minor == 24) {
+                if (((uint64_t)(io2_a_src - iop_a_src)) >= 1) {
+                  v_string_length = ((uint64_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src)));
+                  iop_a_src += 1;
+                  goto label__goto_have_string_length__break;
+                }
+              } else if (v_c_minor == 25) {
+                if (((uint64_t)(io2_a_src - iop_a_src)) >= 2) {
+                  v_string_length = ((uint64_t)(wuffs_base__peek_u16be__no_bounds_check(iop_a_src)));
+                  iop_a_src += 2;
+                  goto label__goto_have_string_length__break;
+                }
+              } else if (v_c_minor == 26) {
+                if (((uint64_t)(io2_a_src - iop_a_src)) >= 4) {
+                  v_string_length = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
+                  iop_a_src += 4;
+                  goto label__goto_have_string_length__break;
+                }
+              } else if (v_c_minor == 27) {
+                if (((uint64_t)(io2_a_src - iop_a_src)) >= 8) {
+                  v_string_length = wuffs_base__peek_u64be__no_bounds_check(iop_a_src);
+                  iop_a_src += 8;
+                  goto label__goto_have_string_length__break;
+                }
+              } else {
+                v_string_length = 0;
+                goto label__goto_have_string_length__break;
+              }
+              if (iop_a_src > io1_a_src) {
+                iop_a_src--;
+                if (a_src && a_src->meta.closed) {
+                  status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
+                  goto exit;
+                }
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+                v_c_major = 0;
+                v_c_minor = 0;
+                goto label__outer__continue;
+              }
+              status = wuffs_base__make_status(wuffs_cbor__error__internal_error_inconsistent_i_o);
+              goto exit;
+            }
+            label__goto_have_string_length__break:;
+          }
+          if (v_c_major == 0) {
+            if (v_c_minor < 26) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)((14680064 | ((uint32_t)((v_string_length & 65535)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__goto_parsed_a_leaf_value__break;
+            } else if (v_c_minor < 28) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)((14680064 | ((uint32_t)((v_string_length >> 46)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                  (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (~(v_string_length & 70368744177663) << WUFFS_BASE__TOKEN__VALUE_EXTENSION__SHIFT) |
+                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__goto_parsed_a_leaf_value__break;
+            }
+          } else if (v_c_major == 1) {
+            if (v_c_minor < 26) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)((12582912 | (2097151 - ((uint32_t)((v_string_length & 65535))))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__goto_parsed_a_leaf_value__break;
+            } else if (v_c_minor < 28) {
+              if (v_string_length < 9223372036854775808u) {
+                *iop_a_dst++ = wuffs_base__make_token(
+                    (((uint64_t)((12582912 | (2097151 - ((uint32_t)((v_string_length >> 46))))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                    (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                    (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                *iop_a_dst++ = wuffs_base__make_token(
+                    (~((18446744073709551615u - v_string_length) & 70368744177663) << WUFFS_BASE__TOKEN__VALUE_EXTENSION__SHIFT) |
+                    (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              } else {
+                *iop_a_dst++ = wuffs_base__make_token(
+                    (((uint64_t)(787997)) << WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT) |
+                    (((uint64_t)(16777216)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                    (((uint64_t)(9)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              }
+              goto label__goto_parsed_a_leaf_value__break;
+            }
+          } else if (v_c_major == 2) {
+            if (v_c_minor < 28) {
+              if (v_string_length == 0) {
+                *iop_a_dst++ = wuffs_base__make_token(
+                    (((uint64_t)(4194560)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                    (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                goto label__goto_parsed_a_leaf_value__break;
+              }
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(4194560)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            } else if (v_c_minor == 31) {
+              if (v_indefinite_string_major_type != 0) {
+                goto label__goto_fail__break;
+              }
+              v_indefinite_string_major_type = 2;
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(4194560)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__outer__continue;
+            } else {
+              goto label__goto_fail__break;
+            }
+            label__0__continue:;
+            while (true) {
+              if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
+                goto label__0__continue;
+              }
+              v_n64 = wuffs_base__u64__min(v_string_length, ((uint64_t)(io2_a_src - iop_a_src)));
+              v_token_length = ((uint32_t)((v_n64 & 65535)));
+              if (v_n64 > 65535) {
+                v_token_length = 65535;
+              } else if (v_token_length <= 0) {
+                if (a_src && a_src->meta.closed) {
+                  status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
+                  goto exit;
+                }
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
+                goto label__0__continue;
+              }
+              if (((uint64_t)(io2_a_src - iop_a_src)) < ((uint64_t)(v_token_length))) {
+                status = wuffs_base__make_status(wuffs_cbor__error__internal_error_inconsistent_token_length);
+                goto exit;
+              }
+              v_string_length -= ((uint64_t)(v_token_length));
+              v_continued = 0;
+              if ((v_string_length > 0) || (v_indefinite_string_major_type > 0)) {
+                v_continued = 1;
+              }
+              iop_a_src += v_token_length;
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(4194816)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(v_continued)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                  (((uint64_t)(v_token_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              if (v_string_length > 0) {
+                goto label__0__continue;
+              } else if (v_indefinite_string_major_type > 0) {
+                goto label__outer__continue;
+              }
+              goto label__goto_parsed_a_leaf_value__break;
+            }
+          } else if (v_c_major == 3) {
+            if (v_c_minor < 28) {
+              if (v_string_length == 0) {
+                *iop_a_dst++ = wuffs_base__make_token(
+                    (((uint64_t)(4194579)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                    (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                goto label__goto_parsed_a_leaf_value__break;
+              }
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(4194579)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            } else if (v_c_minor == 31) {
+              if (v_indefinite_string_major_type != 0) {
+                goto label__goto_fail__break;
+              }
+              v_indefinite_string_major_type = 3;
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(4194579)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__outer__continue;
+            } else {
+              goto label__goto_fail__break;
+            }
+            label__1__continue:;
+            while (true) {
+              if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(6);
+                goto label__1__continue;
+              }
+              v_n64 = wuffs_base__u64__min(v_string_length, 65535);
+              v_n64 = ((uint64_t)(wuffs_base__utf_8__longest_valid_prefix(iop_a_src,
+                  ((size_t)(wuffs_base__u64__min(((uint64_t)(io2_a_src - iop_a_src)), v_n64))))));
+              v_token_length = ((uint32_t)((v_n64 & 65535)));
+              if (v_token_length <= 0) {
+                if ((a_src && a_src->meta.closed) || (((uint64_t)(io2_a_src - iop_a_src)) >= 4)) {
+                  status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
+                  goto exit;
+                }
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(7);
+                goto label__1__continue;
+              }
+              if (((uint64_t)(io2_a_src - iop_a_src)) < ((uint64_t)(v_token_length))) {
+                status = wuffs_base__make_status(wuffs_cbor__error__internal_error_inconsistent_token_length);
+                goto exit;
+              }
+              v_string_length -= ((uint64_t)(v_token_length));
+              v_continued = 0;
+              if ((v_string_length > 0) || (v_indefinite_string_major_type > 0)) {
+                v_continued = 1;
+              }
+              iop_a_src += v_token_length;
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(v_continued)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                  (((uint64_t)(v_token_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              if (v_string_length > 0) {
+                goto label__1__continue;
+              } else if (v_indefinite_string_major_type > 0) {
+                goto label__outer__continue;
+              }
+              goto label__goto_parsed_a_leaf_value__break;
+            }
+          } else if (v_c_major == 4) {
+            if (WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor] == 0) {
+              goto label__goto_fail__break;
+            } else if (v_depth >= 1024) {
+              v_token_length = ((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor]));
+              while ((v_token_length > 0) && (iop_a_src > io1_a_src)) {
+                iop_a_src--;
+                v_token_length -= 1;
+              }
+              status = wuffs_base__make_status(wuffs_cbor__error__unsupported_recursion_depth);
+              goto exit;
+            }
+            v_vminor = 2105361;
+            v_vminor_alt = 2101282;
+            if (v_depth > 0) {
+              v_stack_byte = ((v_depth - 1) / 16);
+              v_stack_bit = (((v_depth - 1) & 15) * 2);
+              if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
+                v_vminor = 2105377;
+                v_vminor_alt = 2105378;
+              } else {
+                v_vminor = 2105409;
+                v_vminor_alt = 2113570;
+              }
+            }
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            if (v_c_minor == 0) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(v_vminor_alt)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__goto_parsed_a_leaf_value__break;
+            }
+            v_stack_byte = (v_depth / 16);
+            v_stack_bit = ((v_depth & 15) * 2);
+            self->private_data.f_stack[v_stack_byte] &= (4294967295 ^ (((uint32_t)(3)) << v_stack_bit));
+            self->private_data.f_container_num_remaining[v_depth] = v_string_length;
+            v_depth += 1;
+            v_tagged = false;
+            goto label__outer__continue;
+          } else if (v_c_major == 5) {
+            if (WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor] == 0) {
+              goto label__goto_fail__break;
+            } else if (v_depth >= 1024) {
+              v_token_length = ((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor]));
+              while ((v_token_length > 0) && (iop_a_src > io1_a_src)) {
+                iop_a_src--;
+                v_token_length -= 1;
+              }
+              status = wuffs_base__make_status(wuffs_cbor__error__unsupported_recursion_depth);
+              goto exit;
+            }
+            v_vminor = 2113553;
+            v_vminor_alt = 2101314;
+            if (v_depth > 0) {
+              v_stack_byte = ((v_depth - 1) / 16);
+              v_stack_bit = (((v_depth - 1) & 15) * 2);
+              if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
+                v_vminor = 2113569;
+                v_vminor_alt = 2105410;
+              } else {
+                v_vminor = 2113601;
+                v_vminor_alt = 2113602;
+              }
+            }
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            if (v_c_minor == 0) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(v_vminor_alt)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__goto_parsed_a_leaf_value__break;
+            }
+            v_stack_byte = (v_depth / 16);
+            v_stack_bit = ((v_depth & 15) * 2);
+            self->private_data.f_stack[v_stack_byte] |= (((uint32_t)(3)) << v_stack_bit);
+            self->private_data.f_container_num_remaining[v_depth] = v_string_length;
+            v_depth += 1;
+            v_tagged = false;
+            goto label__outer__continue;
+          } else if (v_c_major == 6) {
+            if (v_c_minor >= 28) {
+              goto label__goto_fail__break;
+            }
+            if (v_string_length < 262144) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(787997)) << WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT) |
+                  (((uint64_t)((4194304 | ((uint32_t)(v_string_length))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            } else {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(787997)) << WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT) |
+                  (((uint64_t)((4194304 | ((uint32_t)((v_string_length >> 46)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                  (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (~(v_string_length & 70368744177663) << WUFFS_BASE__TOKEN__VALUE_EXTENSION__SHIFT) |
+                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            }
+            v_tagged = true;
+            goto label__outer__continue;
+          } else if (v_c_major == 7) {
+            if (v_c_minor < 20) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(787997)) << WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT) |
+                  (((uint64_t)((8388608 | ((uint32_t)((v_string_length & 255)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__goto_parsed_a_leaf_value__break;
+            } else if (v_c_minor < 24) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(WUFFS_CBOR__LITERALS[(v_c_minor & 3)])) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__goto_parsed_a_leaf_value__break;
+            } else if (v_c_minor == 24) {
+              if (v_string_length < 24) {
+                if ( ! (iop_a_src > io1_a_src)) {
+                  status = wuffs_base__make_status(wuffs_cbor__error__internal_error_inconsistent_i_o);
+                  goto exit;
+                }
+                iop_a_src--;
+                goto label__goto_fail__break;
+              }
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(787997)) << WUFFS_BASE__TOKEN__VALUE_MAJOR__SHIFT) |
+                  (((uint64_t)((8388608 | ((uint32_t)((v_string_length & 255)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(2)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__goto_parsed_a_leaf_value__break;
+            } else if (v_c_minor < 28) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(10490113)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(((uint32_t)(WUFFS_CBOR__TOKEN_LENGTHS[v_c_minor])))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__goto_parsed_a_leaf_value__break;
+            } else if (v_c_minor == 31) {
+              if (v_tagged || (v_depth <= 0)) {
+                goto label__goto_fail__break;
+              }
+              v_depth -= 1;
+              if (self->private_data.f_container_num_remaining[v_depth] != 0) {
+                goto label__goto_fail__break;
+              }
+              v_stack_byte = (v_depth / 16);
+              v_stack_bit = ((v_depth & 15) * 2);
+              v_stack_val = (3 & (self->private_data.f_stack[v_stack_byte] >> v_stack_bit));
+              if (v_stack_val == 1) {
+                goto label__goto_fail__break;
+              }
+              if (v_stack_val != 3) {
+                v_vminor_alt = 2097186;
+              } else {
+                v_vminor_alt = 2097218;
+              }
+              if (v_depth <= 0) {
+                v_vminor_alt |= 4096;
+              } else {
+                v_stack_byte = ((v_depth - 1) / 16);
+                v_stack_bit = (((v_depth - 1) & 15) * 2);
+                if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
+                  v_vminor_alt |= 8192;
+                } else {
+                  v_vminor_alt |= 16384;
+                }
+              }
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(v_vminor_alt)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__goto_parsed_a_leaf_value__break;
+            }
+          }
+          goto label__goto_fail__break;
+        }
+        label__goto_fail__break:;
+        if (iop_a_src > io1_a_src) {
+          iop_a_src--;
+          status = wuffs_base__make_status(wuffs_cbor__error__bad_input);
+          goto exit;
+        }
+        status = wuffs_base__make_status(wuffs_cbor__error__internal_error_inconsistent_i_o);
+        goto exit;
+      }
+      label__goto_parsed_a_leaf_value__break:;
+      v_tagged = false;
+      while (v_depth > 0) {
+        v_stack_byte = ((v_depth - 1) / 16);
+        v_stack_bit = (((v_depth - 1) & 15) * 2);
+        self->private_data.f_stack[v_stack_byte] ^= (((uint32_t)(1)) << (v_stack_bit + 1));
+        if (1 == (3 & (self->private_data.f_stack[v_stack_byte] >> v_stack_bit))) {
+          goto label__outer__continue;
+        }
+        if (self->private_data.f_container_num_remaining[(v_depth - 1)] <= 0) {
+          goto label__outer__continue;
+        }
+        self->private_data.f_container_num_remaining[(v_depth - 1)] -= 1;
+        if (self->private_data.f_container_num_remaining[(v_depth - 1)] > 0) {
+          goto label__outer__continue;
+        }
+        label__2__continue:;
+        while (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(8);
+          goto label__2__continue;
+        }
+        v_depth -= 1;
+        v_stack_byte = (v_depth / 16);
+        v_stack_bit = ((v_depth & 15) * 2);
+        if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
+          v_vminor_alt = 2097186;
+        } else {
+          v_vminor_alt = 2097218;
+        }
+        if (v_depth <= 0) {
+          v_vminor_alt |= 4096;
+        } else {
+          v_stack_byte = ((v_depth - 1) / 16);
+          v_stack_bit = (((v_depth - 1) & 15) * 2);
+          if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
+            v_vminor_alt |= 8192;
+          } else {
+            v_vminor_alt |= 16384;
+          }
+        }
+        *iop_a_dst++ = wuffs_base__make_token(
+            (((uint64_t)(v_vminor_alt)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+            (((uint64_t)(0)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+      }
+      goto label__outer__break;
+    }
+    label__outer__break:;
+    self->private_impl.f_end_of_data = true;
+
+    ok:
+    self->private_impl.p_decode_tokens[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_tokens[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+  self->private_data.s_decode_tokens[0].v_string_length = v_string_length;
+  self->private_data.s_decode_tokens[0].v_depth = v_depth;
+  self->private_data.s_decode_tokens[0].v_token_length = v_token_length;
+  self->private_data.s_decode_tokens[0].v_tagged = v_tagged;
+  self->private_data.s_decode_tokens[0].v_indefinite_string_major_type = v_indefinite_string_major_type;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__CBOR)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__CRC32)
+
+// ---------------- Status Codes Implementations
+
+// ---------------- Private Consts
+
+static const uint32_t
+WUFFS_CRC32__IEEE_TABLE[16][256] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  {
+    0, 1996959894, 3993919788, 2567524794, 124634137, 1886057615, 3915621685, 2657392035,
+    249268274, 2044508324, 3772115230, 2547177864, 162941995, 2125561021, 3887607047, 2428444049,
+    498536548, 1789927666, 4089016648, 2227061214, 450548861, 1843258603, 4107580753, 2211677639,
+    325883990, 1684777152, 4251122042, 2321926636, 335633487, 1661365465, 4195302755, 2366115317,
+    997073096, 1281953886, 3579855332, 2724688242, 1006888145, 1258607687, 3524101629, 2768942443,
+    901097722, 1119000684, 3686517206, 2898065728, 853044451, 1172266101, 3705015759, 2882616665,
+    651767980, 1373503546, 3369554304, 3218104598, 565507253, 1454621731, 3485111705, 3099436303,
+    671266974, 1594198024, 3322730930, 2970347812, 795835527, 1483230225, 3244367275, 3060149565,
+    1994146192, 31158534, 2563907772, 4023717930, 1907459465, 112637215, 2680153253, 3904427059,
+    2013776290, 251722036, 2517215374, 3775830040, 2137656763, 141376813, 2439277719, 3865271297,
+    1802195444, 476864866, 2238001368, 4066508878, 1812370925, 453092731, 2181625025, 4111451223,
+    1706088902, 314042704, 2344532202, 4240017532, 1658658271, 366619977, 2362670323, 4224994405,
+    1303535960, 984961486, 2747007092, 3569037538, 1256170817, 1037604311, 2765210733, 3554079995,
+    1131014506, 879679996, 2909243462, 3663771856, 1141124467, 855842277, 2852801631, 3708648649,
+    1342533948, 654459306, 3188396048, 3373015174, 1466479909, 544179635, 3110523913, 3462522015,
+    1591671054, 702138776, 2966460450, 3352799412, 1504918807, 783551873, 3082640443, 3233442989,
+    3988292384, 2596254646, 62317068, 1957810842, 3939845945, 2647816111, 81470997, 1943803523,
+    3814918930, 2489596804, 225274430, 2053790376, 3826175755, 2466906013, 167816743, 2097651377,
+    4027552580, 2265490386, 503444072, 1762050814, 4150417245, 2154129355, 426522225, 1852507879,
+    4275313526, 2312317920, 282753626, 1742555852, 4189708143, 2394877945, 397917763, 1622183637,
+    3604390888, 2714866558, 953729732, 1340076626, 3518719985, 2797360999, 1068828381, 1219638859,
+    3624741850, 2936675148, 906185462, 1090812512, 3747672003, 2825379669, 829329135, 1181335161,
+    3412177804, 3160834842, 628085408, 1382605366, 3423369109, 3138078467, 570562233, 1426400815,
+    3317316542, 2998733608, 733239954, 1555261956, 3268935591, 3050360625, 752459403, 1541320221,
+    2607071920, 3965973030, 1969922972, 40735498, 2617837225, 3943577151, 1913087877, 83908371,
+    2512341634, 3803740692, 2075208622, 213261112, 2463272603, 3855990285, 2094854071, 198958881,
+    2262029012, 4057260610, 1759359992, 534414190, 2176718541, 4139329115, 1873836001, 414664567,
+    2282248934, 4279200368, 1711684554, 285281116, 2405801727, 4167216745, 1634467795, 376229701,
+    2685067896, 3608007406, 1308918612, 956543938, 2808555105, 3495958263, 1231636301, 1047427035,
+    2932959818, 3654703836, 1088359270, 936918000, 2847714899, 3736837829, 1202900863, 817233897,
+    3183342108, 3401237130, 1404277552, 615818150, 3134207493, 3453421203, 1423857449, 601450431,
+    3009837614, 3294710456, 1567103746, 711928724, 3020668471, 3272380065, 1510334235, 755167117,
+  }, {
+    0, 421212481, 842424962, 724390851, 1684849924, 2105013317, 1448781702, 1329698503,
+    3369699848, 3519200073, 4210026634, 3824474571, 2897563404, 3048111693, 2659397006, 2274893007,
+    1254232657, 1406739216, 2029285587, 1643069842, 783210325, 934667796, 479770071, 92505238,
+    2182846553, 2600511768, 2955803355, 2838940570, 3866582365, 4285295644, 3561045983, 3445231262,
+    2508465314, 2359236067, 2813478432, 3198777185, 4058571174, 3908292839, 3286139684, 3670389349,
+    1566420650, 1145479147, 1869335592, 1987116393, 959540142, 539646703, 185010476, 303839341,
+    3745920755, 3327985586, 3983561841, 4100678960, 3140154359, 2721170102, 2300350837, 2416418868,
+    396344571, 243568058, 631889529, 1018359608, 1945336319, 1793607870, 1103436669, 1490954812,
+    4034481925, 3915546180, 3259968903, 3679722694, 2484439553, 2366552896, 2787371139, 3208174018,
+    950060301, 565965900, 177645455, 328046286, 1556873225, 1171730760, 1861902987, 2011255754,
+    3132841300, 2745199637, 2290958294, 2442530455, 3738671184, 3352078609, 3974232786, 4126854035,
+    1919080284, 1803150877, 1079293406, 1498383519, 370020952, 253043481, 607678682, 1025720731,
+    1711106983, 2095471334, 1472923941, 1322268772, 26324643, 411738082, 866634785, 717028704,
+    2904875439, 3024081134, 2668790573, 2248782444, 3376948395, 3495106026, 4219356713, 3798300520,
+    792689142, 908347575, 487136116, 68299317, 1263779058, 1380486579, 2036719216, 1618931505,
+    3890672638, 4278043327, 3587215740, 3435896893, 2206873338, 2593195963, 2981909624, 2829542713,
+    998479947, 580430090, 162921161, 279890824, 1609522511, 1190423566, 1842954189, 1958874764,
+    4082766403, 3930137346, 3245109441, 3631694208, 2536953671, 2385372678, 2768287173, 3155920004,
+    1900120602, 1750776667, 1131931800, 1517083097, 355290910, 204897887, 656092572, 1040194781,
+    3113746450, 2692952403, 2343461520, 2461357009, 3723805974, 3304059991, 4022511508, 4141455061,
+    2919742697, 3072101800, 2620513899, 2234183466, 3396041197, 3547351212, 4166851439, 3779471918,
+    1725839073, 2143618976, 1424512099, 1307796770, 45282277, 464110244, 813994343, 698327078,
+    3838160568, 4259225593, 3606301754, 3488152955, 2158586812, 2578602749, 2996767038, 2877569151,
+    740041904, 889656817, 506086962, 120682355, 1215357364, 1366020341, 2051441462, 1667084919,
+    3422213966, 3538019855, 4190942668, 3772220557, 2945847882, 3062702859, 2644537544, 2226864521,
+    52649286, 439905287, 823476164, 672009861, 1733269570, 2119477507, 1434057408, 1281543041,
+    2167981343, 2552493150, 3004082077, 2853541596, 3847487515, 4233048410, 3613549209, 3464057816,
+    1239502615, 1358593622, 2077699477, 1657543892, 764250643, 882293586, 532408465, 111204816,
+    1585378284, 1197851309, 1816695150, 1968414767, 974272232, 587794345, 136598634, 289367339,
+    2527558116, 2411481253, 2760973158, 3179948583, 4073438432, 3956313505, 3237863010, 3655790371,
+    347922877, 229101820, 646611775, 1066513022, 1892689081, 1774917112, 1122387515, 1543337850,
+    3697634229, 3313392372, 3998419255, 4148705398, 3087642289, 2702352368, 2319436851, 2468674930,
+  }, {
+    0, 29518391, 59036782, 38190681, 118073564, 114017003, 76381362, 89069189,
+    236147128, 265370511, 228034006, 206958561, 152762724, 148411219, 178138378, 190596925,
+    472294256, 501532999, 530741022, 509615401, 456068012, 451764635, 413917122, 426358261,
+    305525448, 334993663, 296822438, 275991697, 356276756, 352202787, 381193850, 393929805,
+    944588512, 965684439, 1003065998, 973863097, 1061482044, 1049003019, 1019230802, 1023561829,
+    912136024, 933002607, 903529270, 874031361, 827834244, 815125939, 852716522, 856752605,
+    611050896, 631869351, 669987326, 640506825, 593644876, 580921211, 551983394, 556069653,
+    712553512, 733666847, 704405574, 675154545, 762387700, 749958851, 787859610, 792175277,
+    1889177024, 1901651959, 1931368878, 1927033753, 2006131996, 1985040171, 1947726194, 1976933189,
+    2122964088, 2135668303, 2098006038, 2093965857, 2038461604, 2017599123, 2047123658, 2076625661,
+    1824272048, 1836991623, 1866005214, 1861914857, 1807058540, 1786244187, 1748062722, 1777547317,
+    1655668488, 1668093247, 1630251878, 1625932113, 1705433044, 1684323811, 1713505210, 1742760333,
+    1222101792, 1226154263, 1263738702, 1251046777, 1339974652, 1310460363, 1281013650, 1301863845,
+    1187289752, 1191637167, 1161842422, 1149379777, 1103966788, 1074747507, 1112139306, 1133218845,
+    1425107024, 1429406311, 1467333694, 1454888457, 1408811148, 1379576507, 1350309090, 1371438805,
+    1524775400, 1528845279, 1499917702, 1487177649, 1575719220, 1546255107, 1584350554, 1605185389,
+    3778354048, 3774312887, 3803303918, 3816007129, 3862737756, 3892238699, 3854067506, 3833203973,
+    4012263992, 4007927823, 3970080342, 3982554209, 3895452388, 3924658387, 3953866378, 3932773565,
+    4245928176, 4241609415, 4271336606, 4283762345, 4196012076, 4225268251, 4187931714, 4166823541,
+    4076923208, 4072833919, 4035198246, 4047918865, 4094247316, 4123732899, 4153251322, 4132437965,
+    3648544096, 3636082519, 3673983246, 3678331705, 3732010428, 3753090955, 3723829714, 3694611429,
+    3614117080, 3601426159, 3572488374, 3576541825, 3496125444, 3516976691, 3555094634, 3525581405,
+    3311336976, 3298595879, 3336186494, 3340255305, 3260503756, 3281337595, 3251864226, 3222399125,
+    3410866088, 3398419871, 3368647622, 3372945905, 3427010420, 3448139075, 3485520666, 3456284973,
+    2444203584, 2423127159, 2452308526, 2481530905, 2527477404, 2539934891, 2502093554, 2497740997,
+    2679949304, 2659102159, 2620920726, 2650438049, 2562027300, 2574714131, 2603727690, 2599670141,
+    2374579504, 2353749767, 2383274334, 2412743529, 2323684844, 2336421851, 2298759554, 2294686645,
+    2207933576, 2186809023, 2149495014, 2178734801, 2224278612, 2236720739, 2266437690, 2262135309,
+    2850214048, 2820717207, 2858812622, 2879680249, 2934667388, 2938704459, 2909776914, 2897069605,
+    2817622296, 2788420399, 2759153014, 2780249921, 2700618180, 2704950259, 2742877610, 2730399645,
+    3049550800, 3020298727, 3057690558, 3078802825, 2999835404, 3004150075, 2974355298, 2961925461,
+    3151438440, 3121956959, 3092510214, 3113327665, 3168701108, 3172786307, 3210370778, 3197646061,
+  }, {
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+    53374294, 3134568126, 2879970503, 307431215, 2303854645, 816436189, 567589284, 2553242188,
+    3405478781, 1929420949, 1652411116, 3682996484, 1082596894, 4185703926, 3892424591, 1375368295,
+    91404282, 3163122706, 2918450795, 336584067, 2400113305, 922028401, 663249672, 2658384096,
+    2392450098, 929185754, 639587747, 2682555979, 82149713, 3172883129, 2892181696, 362343208,
+    1091578037, 4176212829, 3918960932, 1349337804, 3412872662, 1922537022, 1676344391, 3658557359,
+    1111377379, 4224032267, 3937989746, 1396912026, 3359776896, 1908013928, 1623494929, 3644803833,
+    2377615716, 877417100, 623982837, 2630542109, 130804743, 3190831087, 2941083030, 381060734,
+    106748588, 3215393092, 2933549885, 388083925, 2350956495, 903570471, 614862430, 2640172470,
+    3386185259, 1882115523, 1632872378, 3634920530, 1135178568, 4199721120, 3945775833, 1389631793,
+    1317531835, 4152109907, 3858841898, 1610259138, 3304822232, 2097172016, 1820140617, 3582394273,
+    2165193788, 955639764, 696815021, 2423477829, 192043359, 2995356343, 2750736590, 437203750,
+    182808564, 3005133852, 2724453989, 462947725, 2157513367, 962777471, 673168134, 2447663342,
+    3312231283, 2090301595, 1844056802, 3557935370, 1326499344, 4142603768, 3885397889, 1584245865,
+    3326266917, 2142836173, 1858371508, 3611272284, 1279175494, 4123357358, 3837270743, 1564721471,
+    164299426, 2955991370, 2706223923, 414607579, 2209834945, 978107433, 724686416, 2462715320,
+    2183156074, 1004243586, 715579643, 2472360723, 140260361, 2980573153, 2698675608, 421617264,
+    1302961645, 4099032581, 3845074044, 1557460884, 3352688782, 2116952934, 1867729183, 3601371895,
+    2222754758, 1032278062, 754596439, 2499928511, 234942117, 3086693709, 2793824052, 528319708,
+    1274365761, 4061043881, 3816027856, 1518873912, 3246989858, 2020800970, 1762628531, 3505670235,
+    3223196809, 2045103969, 1754834200, 3512958704, 1247965674, 4086934018, 3806642299, 1528765331,
+    261609486, 3060532198, 2802936223, 518697591, 2246819181, 1007707781, 762121468, 2492913428,
+    213497176, 3041029808, 2755593417, 499441441, 2261110843, 1061030867, 776167850, 2545465922,
+    3274734047, 2060165687, 1807140942, 3528266662, 1229724860, 4038575956, 3788156205, 1479636677,
+    1222322711, 4045468159, 3764231046, 1504067694, 3265744756, 2069664924, 1780612837, 3554288909,
+    2270357136, 1051278712, 802445057, 2519698665, 221152243, 3033880603, 2779263586, 475261322,
+  }, {
+    0, 2926088593, 2275419491, 701019378, 3560000647, 2052709654, 1402038756, 4261017717,
+    1930665807, 3715829470, 4105419308, 1524313021, 2804077512, 155861593, 545453739, 2397726522,
+    3861331614, 1213181711, 1636244477, 3488582252, 840331801, 2625561480, 3048626042, 467584747,
+    2503254481, 995897408, 311723186, 3170637091, 1090907478, 4016929991, 3332753461, 1758288292,
+    390036349, 3109546732, 2426363422, 1056427919, 3272488954, 1835443819, 1152258713, 3938878216,
+    1680663602, 3393484195, 3817652561, 1306808512, 2954733749, 510998820, 935169494, 2580880455,
+    4044899811, 1601229938, 1991794816, 3637571857, 623446372, 2336332021, 2726898695, 216120726,
+    2181814956, 744704829, 95158223, 2881711710, 1446680107, 4166125498, 3516576584, 2146575065,
+    780072698, 2148951915, 2849952665, 129384968, 4199529085, 1411853292, 2112855838, 3548843663,
+    1567451573, 4077254692, 3670887638, 1957027143, 2304517426, 657765539, 251396177, 2694091200,
+    3361327204, 1714510325, 1341779207, 3784408214, 476611811, 2986349938, 2613617024, 899690513,
+    3142211371, 354600634, 1021997640, 2458051545, 1870338988, 3239283261, 3906682575, 1186180958,
+    960597383, 2536053782, 3202459876, 277428597, 3983589632, 1125666961, 1792074851, 3300423154,
+    1246892744, 3829039961, 3455203243, 1671079482, 2657312335, 806080478, 432241452, 3081497277,
+    3748049689, 1896751752, 1489409658, 4138600427, 190316446, 2772397583, 2365053693, 580864876,
+    2893360214, 35503559, 735381813, 2243795108, 2017747153, 3593269568, 4293150130, 1368183843,
+    1560145396, 4069882981, 3680356503, 1966430470, 2295112051, 648294626, 258769936, 2701399425,
+    804156091, 2173100842, 2823706584, 103204425, 4225711676, 1438101421, 2088704863, 3524758222,
+    3134903146, 347226875, 1031468553, 2467456920, 1860935661, 3229814396, 3914054286, 1193487135,
+    3385412645, 1738661300, 1315531078, 3758225623, 502792354, 3012596019, 2589468097, 875607120,
+    1271043721, 3853125400, 3429020650, 1644831355, 2683558414, 832261023, 408158061, 3057348348,
+    953223622, 2528745559, 3211865253, 286899508, 3974120769, 1116263632, 1799381026, 3307794867,
+    2917509143, 59586950, 709201268, 2217549029, 2043995280, 3619452161, 4269064691, 1344032866,
+    3740677976, 1889445577, 1498812987, 4148069290, 180845535, 2762992206, 2372361916, 588238637,
+    1921194766, 3706423967, 4112727661, 1531686908, 2796705673, 148555288, 554857194, 2407195515,
+    26248257, 2952271312, 2251333922, 676868275, 3584149702, 2076793175, 1375858085, 4234771508,
+    2493785488, 986493953, 319029491, 3178008930, 1083533591, 4009621638, 3342158964, 1767759333,
+    3887577823, 1239362382, 1612160956, 3464433197, 864482904, 2649647049, 3022443323, 441336490,
+    1706844275, 3419730402, 3793503504, 1282724993, 2978819316, 535149925, 908921239, 2554697734,
+    380632892, 3100077741, 2433735263, 1063734222, 3265180603, 1828069930, 1161729752, 3948283721,
+    2207997677, 770953084, 71007118, 2857626143, 1470763626, 4190274555, 3490330377, 2120394392,
+    4035494306, 1591758899, 1999168705, 3644880208, 616140069, 2328960180, 2736367686, 225524183,
+  },
+};
+
+static const uint8_t
+WUFFS_CRC32__IEEE_X86_SSE42_K1K2[16] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  212, 43, 68, 84, 1, 0, 0, 0,
+  150, 21, 228, 198, 1, 0, 0, 0,
+};
+
+static const uint8_t
+WUFFS_CRC32__IEEE_X86_SSE42_K3K4[16] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  208, 151, 25, 117, 1, 0, 0, 0,
+  158, 0, 170, 204, 0, 0, 0, 0,
+};
+
+static const uint8_t
+WUFFS_CRC32__IEEE_X86_SSE42_K5ZZ[16] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  36, 97, 205, 99, 1, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+static const uint8_t
+WUFFS_CRC32__IEEE_X86_SSE42_PXMU[16] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  65, 6, 113, 219, 1, 0, 0, 0,
+  65, 22, 1, 247, 1, 0, 0, 0,
+};
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__up(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x);
+
+static wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__up__choosy_default(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x);
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
+static wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__up_arm_crc32(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+static wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__up_x86_avx2(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+static wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__up_x86_sse42(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+
+// ---------------- VTables
+
+const wuffs_base__hasher_u32__func_ptrs
+wuffs_crc32__ieee_hasher__func_ptrs_for__wuffs_base__hasher_u32 = {
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_crc32__ieee_hasher__set_quirk_enabled),
+  (uint32_t(*)(void*,
+      wuffs_base__slice_u8))(&wuffs_crc32__ieee_hasher__update_u32),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_crc32__ieee_hasher__initialize(
+    wuffs_crc32__ieee_hasher* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.choosy_up = &wuffs_crc32__ieee_hasher__up__choosy_default;
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__hasher_u32.vtable_name =
+      wuffs_base__hasher_u32__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__hasher_u32.function_pointers =
+      (const void*)(&wuffs_crc32__ieee_hasher__func_ptrs_for__wuffs_base__hasher_u32);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_crc32__ieee_hasher*
+wuffs_crc32__ieee_hasher__alloc() {
+  wuffs_crc32__ieee_hasher* x =
+      (wuffs_crc32__ieee_hasher*)(calloc(sizeof(wuffs_crc32__ieee_hasher), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_crc32__ieee_hasher__initialize(
+      x, sizeof(wuffs_crc32__ieee_hasher), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_crc32__ieee_hasher() {
+  return sizeof(wuffs_crc32__ieee_hasher);
+}
+
+// ---------------- Function Implementations
+
+// -------- func crc32.ieee_hasher.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__set_quirk_enabled(
+    wuffs_crc32__ieee_hasher* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func crc32.ieee_hasher.update_u32
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_crc32__ieee_hasher__update_u32(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  if (!self) {
+    return 0;
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return 0;
+  }
+
+  if (self->private_impl.f_state == 0) {
+    self->private_impl.choosy_up = (
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
+        wuffs_base__cpu_arch__have_arm_crc32() ? &wuffs_crc32__ieee_hasher__up_arm_crc32 :
+#endif
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+        wuffs_base__cpu_arch__have_x86_avx2() ? &wuffs_crc32__ieee_hasher__up_x86_avx2 :
+#endif
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_crc32__ieee_hasher__up_x86_sse42 :
+#endif
+        self->private_impl.choosy_up);
+  }
+  wuffs_crc32__ieee_hasher__up(self, a_x);
+  return self->private_impl.f_state;
+}
+
+// -------- func crc32.ieee_hasher.up
+
+static wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__up(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  return (*self->private_impl.choosy_up)(self, a_x);
+}
+
+static wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__up__choosy_default(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  uint32_t v_s = 0;
+  wuffs_base__slice_u8 v_p = {0};
+
+  v_s = (4294967295 ^ self->private_impl.f_state);
+  {
+    wuffs_base__slice_u8 i_slice_p = a_x;
+    v_p.ptr = i_slice_p.ptr;
+    v_p.len = 16;
+    uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 32) * 32);
+    while (v_p.ptr < i_end0_p) {
+      v_s ^= ((((uint32_t)(v_p.ptr[0])) << 0) |
+          (((uint32_t)(v_p.ptr[1])) << 8) |
+          (((uint32_t)(v_p.ptr[2])) << 16) |
+          (((uint32_t)(v_p.ptr[3])) << 24));
+      v_s = (WUFFS_CRC32__IEEE_TABLE[0][v_p.ptr[15]] ^
+          WUFFS_CRC32__IEEE_TABLE[1][v_p.ptr[14]] ^
+          WUFFS_CRC32__IEEE_TABLE[2][v_p.ptr[13]] ^
+          WUFFS_CRC32__IEEE_TABLE[3][v_p.ptr[12]] ^
+          WUFFS_CRC32__IEEE_TABLE[4][v_p.ptr[11]] ^
+          WUFFS_CRC32__IEEE_TABLE[5][v_p.ptr[10]] ^
+          WUFFS_CRC32__IEEE_TABLE[6][v_p.ptr[9]] ^
+          WUFFS_CRC32__IEEE_TABLE[7][v_p.ptr[8]] ^
+          WUFFS_CRC32__IEEE_TABLE[8][v_p.ptr[7]] ^
+          WUFFS_CRC32__IEEE_TABLE[9][v_p.ptr[6]] ^
+          WUFFS_CRC32__IEEE_TABLE[10][v_p.ptr[5]] ^
+          WUFFS_CRC32__IEEE_TABLE[11][v_p.ptr[4]] ^
+          WUFFS_CRC32__IEEE_TABLE[12][(255 & (v_s >> 24))] ^
+          WUFFS_CRC32__IEEE_TABLE[13][(255 & (v_s >> 16))] ^
+          WUFFS_CRC32__IEEE_TABLE[14][(255 & (v_s >> 8))] ^
+          WUFFS_CRC32__IEEE_TABLE[15][(255 & (v_s >> 0))]);
+      v_p.ptr += 16;
+      v_s ^= ((((uint32_t)(v_p.ptr[0])) << 0) |
+          (((uint32_t)(v_p.ptr[1])) << 8) |
+          (((uint32_t)(v_p.ptr[2])) << 16) |
+          (((uint32_t)(v_p.ptr[3])) << 24));
+      v_s = (WUFFS_CRC32__IEEE_TABLE[0][v_p.ptr[15]] ^
+          WUFFS_CRC32__IEEE_TABLE[1][v_p.ptr[14]] ^
+          WUFFS_CRC32__IEEE_TABLE[2][v_p.ptr[13]] ^
+          WUFFS_CRC32__IEEE_TABLE[3][v_p.ptr[12]] ^
+          WUFFS_CRC32__IEEE_TABLE[4][v_p.ptr[11]] ^
+          WUFFS_CRC32__IEEE_TABLE[5][v_p.ptr[10]] ^
+          WUFFS_CRC32__IEEE_TABLE[6][v_p.ptr[9]] ^
+          WUFFS_CRC32__IEEE_TABLE[7][v_p.ptr[8]] ^
+          WUFFS_CRC32__IEEE_TABLE[8][v_p.ptr[7]] ^
+          WUFFS_CRC32__IEEE_TABLE[9][v_p.ptr[6]] ^
+          WUFFS_CRC32__IEEE_TABLE[10][v_p.ptr[5]] ^
+          WUFFS_CRC32__IEEE_TABLE[11][v_p.ptr[4]] ^
+          WUFFS_CRC32__IEEE_TABLE[12][(255 & (v_s >> 24))] ^
+          WUFFS_CRC32__IEEE_TABLE[13][(255 & (v_s >> 16))] ^
+          WUFFS_CRC32__IEEE_TABLE[14][(255 & (v_s >> 8))] ^
+          WUFFS_CRC32__IEEE_TABLE[15][(255 & (v_s >> 0))]);
+      v_p.ptr += 16;
+    }
+    v_p.len = 16;
+    uint8_t* i_end1_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 16) * 16);
+    while (v_p.ptr < i_end1_p) {
+      v_s ^= ((((uint32_t)(v_p.ptr[0])) << 0) |
+          (((uint32_t)(v_p.ptr[1])) << 8) |
+          (((uint32_t)(v_p.ptr[2])) << 16) |
+          (((uint32_t)(v_p.ptr[3])) << 24));
+      v_s = (WUFFS_CRC32__IEEE_TABLE[0][v_p.ptr[15]] ^
+          WUFFS_CRC32__IEEE_TABLE[1][v_p.ptr[14]] ^
+          WUFFS_CRC32__IEEE_TABLE[2][v_p.ptr[13]] ^
+          WUFFS_CRC32__IEEE_TABLE[3][v_p.ptr[12]] ^
+          WUFFS_CRC32__IEEE_TABLE[4][v_p.ptr[11]] ^
+          WUFFS_CRC32__IEEE_TABLE[5][v_p.ptr[10]] ^
+          WUFFS_CRC32__IEEE_TABLE[6][v_p.ptr[9]] ^
+          WUFFS_CRC32__IEEE_TABLE[7][v_p.ptr[8]] ^
+          WUFFS_CRC32__IEEE_TABLE[8][v_p.ptr[7]] ^
+          WUFFS_CRC32__IEEE_TABLE[9][v_p.ptr[6]] ^
+          WUFFS_CRC32__IEEE_TABLE[10][v_p.ptr[5]] ^
+          WUFFS_CRC32__IEEE_TABLE[11][v_p.ptr[4]] ^
+          WUFFS_CRC32__IEEE_TABLE[12][(255 & (v_s >> 24))] ^
+          WUFFS_CRC32__IEEE_TABLE[13][(255 & (v_s >> 16))] ^
+          WUFFS_CRC32__IEEE_TABLE[14][(255 & (v_s >> 8))] ^
+          WUFFS_CRC32__IEEE_TABLE[15][(255 & (v_s >> 0))]);
+      v_p.ptr += 16;
+    }
+    v_p.len = 1;
+    uint8_t* i_end2_p = i_slice_p.ptr + i_slice_p.len;
+    while (v_p.ptr < i_end2_p) {
+      v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ v_p.ptr[0])] ^ (v_s >> 8));
+      v_p.ptr += 1;
+    }
+    v_p.len = 0;
+  }
+  self->private_impl.f_state = (4294967295 ^ v_s);
+  return wuffs_base__make_empty_struct();
+}
+
+// ‼ WUFFS MULTI-FILE SECTION +arm_crc32
+// -------- func crc32.ieee_hasher.up_arm_crc32
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
+static wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__up_arm_crc32(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  wuffs_base__slice_u8 v_p = {0};
+  uint32_t v_s = 0;
+
+  v_s = (4294967295 ^ self->private_impl.f_state);
+  while ((((uint64_t)(a_x.len)) > 0) && ((15 & ((uint32_t)(0xFFF & (uintptr_t)(a_x.ptr)))) != 0)) {
+    v_s = __crc32b(v_s, a_x.ptr[0]);
+    a_x = wuffs_base__slice_u8__subslice_i(a_x, 1);
+  }
+  {
+    wuffs_base__slice_u8 i_slice_p = a_x;
+    v_p.ptr = i_slice_p.ptr;
+    v_p.len = 8;
+    uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 128) * 128);
+    while (v_p.ptr < i_end0_p) {
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+    }
+    v_p.len = 8;
+    uint8_t* i_end1_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 8) * 8);
+    while (v_p.ptr < i_end1_p) {
+      v_s = __crc32d(v_s, wuffs_base__peek_u64le__no_bounds_check(v_p.ptr));
+      v_p.ptr += 8;
+    }
+    v_p.len = 1;
+    uint8_t* i_end2_p = i_slice_p.ptr + i_slice_p.len;
+    while (v_p.ptr < i_end2_p) {
+      v_s = __crc32b(v_s, v_p.ptr[0]);
+      v_p.ptr += 1;
+    }
+    v_p.len = 0;
+  }
+  self->private_impl.f_state = (4294967295 ^ v_s);
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_CRC32)
+// ‼ WUFFS MULTI-FILE SECTION -arm_crc32
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_avx2
+// -------- func crc32.ieee_hasher.up_x86_avx2
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2,avx2")
+static wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__up_x86_avx2(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  uint32_t v_s = 0;
+  wuffs_base__slice_u8 v_p = {0};
+  __m128i v_k = {0};
+  __m128i v_x0 = {0};
+  __m128i v_x1 = {0};
+  __m128i v_x2 = {0};
+  __m128i v_x3 = {0};
+  __m128i v_y0 = {0};
+  __m128i v_y1 = {0};
+  __m128i v_y2 = {0};
+  __m128i v_y3 = {0};
+  uint64_t v_tail_index = 0;
+
+  v_s = (4294967295 ^ self->private_impl.f_state);
+  while ((((uint64_t)(a_x.len)) > 0) && ((15 & ((uint32_t)(0xFFF & (uintptr_t)(a_x.ptr)))) != 0)) {
+    v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ a_x.ptr[0])] ^ (v_s >> 8));
+    a_x = wuffs_base__slice_u8__subslice_i(a_x, 1);
+  }
+  if (((uint64_t)(a_x.len)) < 64) {
+    {
+      wuffs_base__slice_u8 i_slice_p = a_x;
+      v_p.ptr = i_slice_p.ptr;
+      v_p.len = 1;
+      uint8_t* i_end0_p = i_slice_p.ptr + i_slice_p.len;
+      while (v_p.ptr < i_end0_p) {
+        v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ v_p.ptr[0])] ^ (v_s >> 8));
+        v_p.ptr += 1;
+      }
+      v_p.len = 0;
+    }
+    self->private_impl.f_state = (4294967295 ^ v_s);
+    return wuffs_base__make_empty_struct();
+  }
+  v_x0 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 0));
+  v_x1 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 16));
+  v_x2 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 32));
+  v_x3 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 48));
+  v_x0 = _mm_xor_si128(v_x0, _mm_cvtsi32_si128((int32_t)(v_s)));
+  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_K1K2));
+  {
+    wuffs_base__slice_u8 i_slice_p = wuffs_base__slice_u8__subslice_i(a_x, 64);
+    v_p.ptr = i_slice_p.ptr;
+    v_p.len = 64;
+    uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 64) * 64);
+    while (v_p.ptr < i_end0_p) {
+      v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
+      v_y1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(0));
+      v_y2 = _mm_clmulepi64_si128(v_x2, v_k, (int32_t)(0));
+      v_y3 = _mm_clmulepi64_si128(v_x3, v_k, (int32_t)(0));
+      v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
+      v_x1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(17));
+      v_x2 = _mm_clmulepi64_si128(v_x2, v_k, (int32_t)(17));
+      v_x3 = _mm_clmulepi64_si128(v_x3, v_k, (int32_t)(17));
+      v_x0 = _mm_xor_si128(_mm_xor_si128(v_x0, v_y0), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 0)));
+      v_x1 = _mm_xor_si128(_mm_xor_si128(v_x1, v_y1), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 16)));
+      v_x2 = _mm_xor_si128(_mm_xor_si128(v_x2, v_y2), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 32)));
+      v_x3 = _mm_xor_si128(_mm_xor_si128(v_x3, v_y3), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 48)));
+      v_p.ptr += 64;
+    }
+    v_p.len = 0;
+  }
+  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_K3K4));
+  v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
+  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
+  v_x0 = _mm_xor_si128(v_x0, v_x1);
+  v_x0 = _mm_xor_si128(v_x0, v_y0);
+  v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
+  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
+  v_x0 = _mm_xor_si128(v_x0, v_x2);
+  v_x0 = _mm_xor_si128(v_x0, v_y0);
+  v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
+  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
+  v_x0 = _mm_xor_si128(v_x0, v_x3);
+  v_x0 = _mm_xor_si128(v_x0, v_y0);
+  v_x1 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(16));
+  v_x2 = _mm_set_epi32((int32_t)(0), (int32_t)(4294967295), (int32_t)(0), (int32_t)(4294967295));
+  v_x0 = _mm_srli_si128(v_x0, (int32_t)(8));
+  v_x0 = _mm_xor_si128(v_x0, v_x1);
+  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_K5ZZ));
+  v_x1 = _mm_srli_si128(v_x0, (int32_t)(4));
+  v_x0 = _mm_and_si128(v_x0, v_x2);
+  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
+  v_x0 = _mm_xor_si128(v_x0, v_x1);
+  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_PXMU));
+  v_x1 = _mm_and_si128(v_x0, v_x2);
+  v_x1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(16));
+  v_x1 = _mm_and_si128(v_x1, v_x2);
+  v_x1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(0));
+  v_x0 = _mm_xor_si128(v_x0, v_x1);
+  v_s = ((uint32_t)(_mm_extract_epi32(v_x0, (int32_t)(1))));
+  v_tail_index = (((uint64_t)(a_x.len)) & 18446744073709551552u);
+  if (v_tail_index < ((uint64_t)(a_x.len))) {
+    {
+      wuffs_base__slice_u8 i_slice_p = wuffs_base__slice_u8__subslice_i(a_x, v_tail_index);
+      v_p.ptr = i_slice_p.ptr;
+      v_p.len = 1;
+      uint8_t* i_end0_p = i_slice_p.ptr + i_slice_p.len;
+      while (v_p.ptr < i_end0_p) {
+        v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ v_p.ptr[0])] ^ (v_s >> 8));
+        v_p.ptr += 1;
+      }
+      v_p.len = 0;
+    }
+  }
+  self->private_impl.f_state = (4294967295 ^ v_s);
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_avx2
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_sse42
+// -------- func crc32.ieee_hasher.up_x86_sse42
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2")
+static wuffs_base__empty_struct
+wuffs_crc32__ieee_hasher__up_x86_sse42(
+    wuffs_crc32__ieee_hasher* self,
+    wuffs_base__slice_u8 a_x) {
+  uint32_t v_s = 0;
+  wuffs_base__slice_u8 v_p = {0};
+  __m128i v_k = {0};
+  __m128i v_x0 = {0};
+  __m128i v_x1 = {0};
+  __m128i v_x2 = {0};
+  __m128i v_x3 = {0};
+  __m128i v_y0 = {0};
+  __m128i v_y1 = {0};
+  __m128i v_y2 = {0};
+  __m128i v_y3 = {0};
+  uint64_t v_tail_index = 0;
+
+  v_s = (4294967295 ^ self->private_impl.f_state);
+  while ((((uint64_t)(a_x.len)) > 0) && ((15 & ((uint32_t)(0xFFF & (uintptr_t)(a_x.ptr)))) != 0)) {
+    v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ a_x.ptr[0])] ^ (v_s >> 8));
+    a_x = wuffs_base__slice_u8__subslice_i(a_x, 1);
+  }
+  if (((uint64_t)(a_x.len)) < 64) {
+    {
+      wuffs_base__slice_u8 i_slice_p = a_x;
+      v_p.ptr = i_slice_p.ptr;
+      v_p.len = 1;
+      uint8_t* i_end0_p = i_slice_p.ptr + i_slice_p.len;
+      while (v_p.ptr < i_end0_p) {
+        v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ v_p.ptr[0])] ^ (v_s >> 8));
+        v_p.ptr += 1;
+      }
+      v_p.len = 0;
+    }
+    self->private_impl.f_state = (4294967295 ^ v_s);
+    return wuffs_base__make_empty_struct();
+  }
+  v_x0 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 0));
+  v_x1 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 16));
+  v_x2 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 32));
+  v_x3 = _mm_lddqu_si128((const __m128i*)(const void*)(a_x.ptr + 48));
+  v_x0 = _mm_xor_si128(v_x0, _mm_cvtsi32_si128((int32_t)(v_s)));
+  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_K1K2));
+  {
+    wuffs_base__slice_u8 i_slice_p = wuffs_base__slice_u8__subslice_i(a_x, 64);
+    v_p.ptr = i_slice_p.ptr;
+    v_p.len = 64;
+    uint8_t* i_end0_p = v_p.ptr + (((i_slice_p.len - (size_t)(v_p.ptr - i_slice_p.ptr)) / 64) * 64);
+    while (v_p.ptr < i_end0_p) {
+      v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
+      v_y1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(0));
+      v_y2 = _mm_clmulepi64_si128(v_x2, v_k, (int32_t)(0));
+      v_y3 = _mm_clmulepi64_si128(v_x3, v_k, (int32_t)(0));
+      v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
+      v_x1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(17));
+      v_x2 = _mm_clmulepi64_si128(v_x2, v_k, (int32_t)(17));
+      v_x3 = _mm_clmulepi64_si128(v_x3, v_k, (int32_t)(17));
+      v_x0 = _mm_xor_si128(_mm_xor_si128(v_x0, v_y0), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 0)));
+      v_x1 = _mm_xor_si128(_mm_xor_si128(v_x1, v_y1), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 16)));
+      v_x2 = _mm_xor_si128(_mm_xor_si128(v_x2, v_y2), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 32)));
+      v_x3 = _mm_xor_si128(_mm_xor_si128(v_x3, v_y3), _mm_lddqu_si128((const __m128i*)(const void*)(v_p.ptr + 48)));
+      v_p.ptr += 64;
+    }
+    v_p.len = 0;
+  }
+  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_K3K4));
+  v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
+  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
+  v_x0 = _mm_xor_si128(v_x0, v_x1);
+  v_x0 = _mm_xor_si128(v_x0, v_y0);
+  v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
+  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
+  v_x0 = _mm_xor_si128(v_x0, v_x2);
+  v_x0 = _mm_xor_si128(v_x0, v_y0);
+  v_y0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
+  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(17));
+  v_x0 = _mm_xor_si128(v_x0, v_x3);
+  v_x0 = _mm_xor_si128(v_x0, v_y0);
+  v_x1 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(16));
+  v_x2 = _mm_set_epi32((int32_t)(0), (int32_t)(4294967295), (int32_t)(0), (int32_t)(4294967295));
+  v_x0 = _mm_srli_si128(v_x0, (int32_t)(8));
+  v_x0 = _mm_xor_si128(v_x0, v_x1);
+  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_K5ZZ));
+  v_x1 = _mm_srli_si128(v_x0, (int32_t)(4));
+  v_x0 = _mm_and_si128(v_x0, v_x2);
+  v_x0 = _mm_clmulepi64_si128(v_x0, v_k, (int32_t)(0));
+  v_x0 = _mm_xor_si128(v_x0, v_x1);
+  v_k = _mm_lddqu_si128((const __m128i*)(const void*)(WUFFS_CRC32__IEEE_X86_SSE42_PXMU));
+  v_x1 = _mm_and_si128(v_x0, v_x2);
+  v_x1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(16));
+  v_x1 = _mm_and_si128(v_x1, v_x2);
+  v_x1 = _mm_clmulepi64_si128(v_x1, v_k, (int32_t)(0));
+  v_x0 = _mm_xor_si128(v_x0, v_x1);
+  v_s = ((uint32_t)(_mm_extract_epi32(v_x0, (int32_t)(1))));
+  v_tail_index = (((uint64_t)(a_x.len)) & 18446744073709551552u);
+  if (v_tail_index < ((uint64_t)(a_x.len))) {
+    {
+      wuffs_base__slice_u8 i_slice_p = wuffs_base__slice_u8__subslice_i(a_x, v_tail_index);
+      v_p.ptr = i_slice_p.ptr;
+      v_p.len = 1;
+      uint8_t* i_end0_p = i_slice_p.ptr + i_slice_p.len;
+      while (v_p.ptr < i_end0_p) {
+        v_s = (WUFFS_CRC32__IEEE_TABLE[0][(((uint8_t)((v_s & 255))) ^ v_p.ptr[0])] ^ (v_s >> 8));
+        v_p.ptr += 1;
+      }
+      v_p.len = 0;
+    }
+  }
+  self->private_impl.f_state = (4294967295 ^ v_s);
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_sse42
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__CRC32)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__DEFLATE)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_deflate__error__bad_huffman_code_over_subscribed[] = "#deflate: bad Huffman code (over-subscribed)";
+const char wuffs_deflate__error__bad_huffman_code_under_subscribed[] = "#deflate: bad Huffman code (under-subscribed)";
+const char wuffs_deflate__error__bad_huffman_code_length_count[] = "#deflate: bad Huffman code length count";
+const char wuffs_deflate__error__bad_huffman_code_length_repetition[] = "#deflate: bad Huffman code length repetition";
+const char wuffs_deflate__error__bad_huffman_code[] = "#deflate: bad Huffman code";
+const char wuffs_deflate__error__bad_huffman_minimum_code_length[] = "#deflate: bad Huffman minimum code length";
+const char wuffs_deflate__error__bad_block[] = "#deflate: bad block";
+const char wuffs_deflate__error__bad_distance[] = "#deflate: bad distance";
+const char wuffs_deflate__error__bad_distance_code_count[] = "#deflate: bad distance code count";
+const char wuffs_deflate__error__bad_literal_length_code_count[] = "#deflate: bad literal/length code count";
+const char wuffs_deflate__error__inconsistent_stored_block_length[] = "#deflate: inconsistent stored block length";
+const char wuffs_deflate__error__missing_end_of_block_code[] = "#deflate: missing end-of-block code";
+const char wuffs_deflate__error__no_huffman_codes[] = "#deflate: no Huffman codes";
+const char wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state[] = "#deflate: internal error: inconsistent Huffman decoder state";
+const char wuffs_deflate__error__internal_error_inconsistent_i_o[] = "#deflate: internal error: inconsistent I/O";
+const char wuffs_deflate__error__internal_error_inconsistent_distance[] = "#deflate: internal error: inconsistent distance";
+const char wuffs_deflate__error__internal_error_inconsistent_n_bits[] = "#deflate: internal error: inconsistent n_bits";
+
+// ---------------- Private Consts
+
+static const uint8_t
+WUFFS_DEFLATE__CODE_ORDER[19] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  16, 17, 18, 0, 8, 7, 9, 6,
+  10, 5, 11, 4, 12, 3, 13, 2,
+  14, 1, 15,
+};
+
+static const uint8_t
+WUFFS_DEFLATE__REVERSE8[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  0, 128, 64, 192, 32, 160, 96, 224,
+  16, 144, 80, 208, 48, 176, 112, 240,
+  8, 136, 72, 200, 40, 168, 104, 232,
+  24, 152, 88, 216, 56, 184, 120, 248,
+  4, 132, 68, 196, 36, 164, 100, 228,
+  20, 148, 84, 212, 52, 180, 116, 244,
+  12, 140, 76, 204, 44, 172, 108, 236,
+  28, 156, 92, 220, 60, 188, 124, 252,
+  2, 130, 66, 194, 34, 162, 98, 226,
+  18, 146, 82, 210, 50, 178, 114, 242,
+  10, 138, 74, 202, 42, 170, 106, 234,
+  26, 154, 90, 218, 58, 186, 122, 250,
+  6, 134, 70, 198, 38, 166, 102, 230,
+  22, 150, 86, 214, 54, 182, 118, 246,
+  14, 142, 78, 206, 46, 174, 110, 238,
+  30, 158, 94, 222, 62, 190, 126, 254,
+  1, 129, 65, 193, 33, 161, 97, 225,
+  17, 145, 81, 209, 49, 177, 113, 241,
+  9, 137, 73, 201, 41, 169, 105, 233,
+  25, 153, 89, 217, 57, 185, 121, 249,
+  5, 133, 69, 197, 37, 165, 101, 229,
+  21, 149, 85, 213, 53, 181, 117, 245,
+  13, 141, 77, 205, 45, 173, 109, 237,
+  29, 157, 93, 221, 61, 189, 125, 253,
+  3, 131, 67, 195, 35, 163, 99, 227,
+  19, 147, 83, 211, 51, 179, 115, 243,
+  11, 139, 75, 203, 43, 171, 107, 235,
+  27, 155, 91, 219, 59, 187, 123, 251,
+  7, 135, 71, 199, 39, 167, 103, 231,
+  23, 151, 87, 215, 55, 183, 119, 247,
+  15, 143, 79, 207, 47, 175, 111, 239,
+  31, 159, 95, 223, 63, 191, 127, 255,
+};
+
+static const uint32_t
+WUFFS_DEFLATE__LCODE_MAGIC_NUMBERS[32] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  1073741824, 1073742080, 1073742336, 1073742592, 1073742848, 1073743104, 1073743360, 1073743616,
+  1073743888, 1073744400, 1073744912, 1073745424, 1073745952, 1073746976, 1073748000, 1073749024,
+  1073750064, 1073752112, 1073754160, 1073756208, 1073758272, 1073762368, 1073766464, 1073770560,
+  1073774672, 1073782864, 1073791056, 1073799248, 1073807104, 134217728, 134217728, 134217728,
+};
+
+static const uint32_t
+WUFFS_DEFLATE__DCODE_MAGIC_NUMBERS[32] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  1073741824, 1073742080, 1073742336, 1073742592, 1073742864, 1073743376, 1073743904, 1073744928,
+  1073745968, 1073748016, 1073750080, 1073754176, 1073758288, 1073766480, 1073774688, 1073791072,
+  1073807472, 1073840240, 1073873024, 1073938560, 1074004112, 1074135184, 1074266272, 1074528416,
+  1074790576, 1075314864, 1075839168, 1076887744, 1077936336, 1080033488, 134217728, 134217728,
+};
+
+#define WUFFS_DEFLATE__HUFFS_TABLE_SIZE 1024
+
+#define WUFFS_DEFLATE__HUFFS_TABLE_MASK 1023
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_blocks(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_uncompressed(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_deflate__decoder__init_fixed_huffman(
+    wuffs_deflate__decoder* self);
+
+static wuffs_base__status
+wuffs_deflate__decoder__init_dynamic_huffman(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_deflate__decoder__init_huff(
+    wuffs_deflate__decoder* self,
+    uint32_t a_which,
+    uint32_t a_n_codes0,
+    uint32_t a_n_codes1,
+    uint32_t a_base_symbol);
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+static wuffs_base__status
+wuffs_deflate__decoder__decode_huffman_bmi2(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_huffman_fast32(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_huffman_fast64(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_huffman_fast64__choosy_default(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_huffman_slow(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+// ---------------- VTables
+
+const wuffs_base__io_transformer__func_ptrs
+wuffs_deflate__decoder__func_ptrs_for__wuffs_base__io_transformer = {
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_deflate__decoder__set_quirk_enabled),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__io_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__slice_u8))(&wuffs_deflate__decoder__transform_io),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_deflate__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_deflate__decoder__initialize(
+    wuffs_deflate__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.choosy_decode_huffman_fast64 = &wuffs_deflate__decoder__decode_huffman_fast64__choosy_default;
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__io_transformer.vtable_name =
+      wuffs_base__io_transformer__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__io_transformer.function_pointers =
+      (const void*)(&wuffs_deflate__decoder__func_ptrs_for__wuffs_base__io_transformer);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_deflate__decoder*
+wuffs_deflate__decoder__alloc() {
+  wuffs_deflate__decoder* x =
+      (wuffs_deflate__decoder*)(calloc(sizeof(wuffs_deflate__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_deflate__decoder__initialize(
+      x, sizeof(wuffs_deflate__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_deflate__decoder() {
+  return sizeof(wuffs_deflate__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func deflate.decoder.add_history
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_deflate__decoder__add_history(
+    wuffs_deflate__decoder* self,
+    wuffs_base__slice_u8 a_hist) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  wuffs_base__slice_u8 v_s = {0};
+  uint64_t v_n_copied = 0;
+  uint32_t v_already_full = 0;
+
+  v_s = a_hist;
+  if (((uint64_t)(v_s.len)) >= 32768) {
+    v_s = wuffs_base__slice_u8__suffix(v_s, 32768);
+    wuffs_base__slice_u8__copy_from_slice(wuffs_base__make_slice_u8(self->private_data.f_history, 32768), v_s);
+    self->private_impl.f_history_index = 32768;
+  } else {
+    v_n_copied = wuffs_base__slice_u8__copy_from_slice(wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 32768), (self->private_impl.f_history_index & 32767)), v_s);
+    if (v_n_copied < ((uint64_t)(v_s.len))) {
+      v_s = wuffs_base__slice_u8__subslice_i(v_s, v_n_copied);
+      v_n_copied = wuffs_base__slice_u8__copy_from_slice(wuffs_base__make_slice_u8(self->private_data.f_history, 32768), v_s);
+      self->private_impl.f_history_index = (((uint32_t)((v_n_copied & 32767))) + 32768);
+    } else {
+      v_already_full = 0;
+      if (self->private_impl.f_history_index >= 32768) {
+        v_already_full = 32768;
+      }
+      self->private_impl.f_history_index = ((self->private_impl.f_history_index & 32767) + ((uint32_t)((v_n_copied & 32767))) + v_already_full);
+    }
+  }
+  wuffs_base__slice_u8__copy_from_slice(wuffs_base__make_slice_u8((self->private_data.f_history) + 32768, 257), wuffs_base__make_slice_u8(self->private_data.f_history, 33025));
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func deflate.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_deflate__decoder__set_quirk_enabled(
+    wuffs_deflate__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func deflate.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_deflate__decoder__workbuf_len(
+    const wuffs_deflate__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- func deflate.decoder.transform_io
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_deflate__decoder__transform_io(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint64_t v_mark = 0;
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_transform_io[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.choosy_decode_huffman_fast64 = (
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+        wuffs_base__cpu_arch__have_x86_bmi2() ? &wuffs_deflate__decoder__decode_huffman_bmi2 :
+#endif
+        self->private_impl.choosy_decode_huffman_fast64);
+    while (true) {
+      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
+      {
+        if (a_dst) {
+          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+        }
+        wuffs_base__status t_0 = wuffs_deflate__decoder__decode_blocks(self, a_dst, a_src);
+        v_status = t_0;
+        if (a_dst) {
+          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+        }
+      }
+      if ( ! wuffs_base__status__is_suspension(&v_status)) {
+        status = v_status;
+        if (wuffs_base__status__is_error(&status)) {
+          goto exit;
+        } else if (wuffs_base__status__is_suspension(&status)) {
+          status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+          goto exit;
+        }
+        goto ok;
+      }
+      wuffs_base__u64__sat_add_indirect(&self->private_impl.f_transformed_history_count, wuffs_base__io__count_since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst))));
+      wuffs_deflate__decoder__add_history(self, wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)), io0_a_dst));
+      status = v_status;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+    }
+
+    ok:
+    self->private_impl.p_transform_io[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_transform_io[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func deflate.decoder.decode_blocks
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_blocks(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_final = 0;
+  uint32_t v_b0 = 0;
+  uint32_t v_type = 0;
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_blocks[0];
+  if (coro_susp_point) {
+    v_final = self->private_data.s_decode_blocks[0].v_final;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    label__outer__continue:;
+    while (v_final == 0) {
+      while (self->private_impl.f_n_bits < 3) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint32_t t_0 = *iop_a_src++;
+          v_b0 = t_0;
+        }
+        self->private_impl.f_bits |= (v_b0 << (self->private_impl.f_n_bits & 3));
+        self->private_impl.f_n_bits = ((self->private_impl.f_n_bits & 3) + 8);
+      }
+      v_final = (self->private_impl.f_bits & 1);
+      v_type = ((self->private_impl.f_bits >> 1) & 3);
+      self->private_impl.f_bits >>= 3;
+      self->private_impl.f_n_bits -= 3;
+      if (v_type == 0) {
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        status = wuffs_deflate__decoder__decode_uncompressed(self, a_dst, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+        goto label__outer__continue;
+      } else if (v_type == 1) {
+        v_status = wuffs_deflate__decoder__init_fixed_huffman(self);
+        if ( ! wuffs_base__status__is_ok(&v_status)) {
+          status = v_status;
+          if (wuffs_base__status__is_error(&status)) {
+            goto exit;
+          } else if (wuffs_base__status__is_suspension(&status)) {
+            status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+            goto exit;
+          }
+          goto ok;
+        }
+      } else if (v_type == 2) {
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+        status = wuffs_deflate__decoder__init_dynamic_huffman(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+      } else {
+        status = wuffs_base__make_status(wuffs_deflate__error__bad_block);
+        goto exit;
+      }
+      self->private_impl.f_end_of_block = false;
+      while (true) {
+        if (sizeof(void*) == 4) {
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          v_status = wuffs_deflate__decoder__decode_huffman_fast32(self, a_dst, a_src);
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+        } else {
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          v_status = wuffs_deflate__decoder__decode_huffman_fast64(self, a_dst, a_src);
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+        }
+        if (wuffs_base__status__is_error(&v_status)) {
+          status = v_status;
+          goto exit;
+        }
+        if (self->private_impl.f_end_of_block) {
+          goto label__outer__continue;
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        status = wuffs_deflate__decoder__decode_huffman_slow(self, a_dst, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+        if (self->private_impl.f_end_of_block) {
+          goto label__outer__continue;
+        }
+      }
+    }
+
+    ok:
+    self->private_impl.p_decode_blocks[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_blocks[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_blocks[0].v_final = v_final;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func deflate.decoder.decode_uncompressed
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_uncompressed(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_length = 0;
+  uint32_t v_n_copied = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_uncompressed[0];
+  if (coro_susp_point) {
+    v_length = self->private_data.s_decode_uncompressed[0].v_length;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+      goto exit;
+    }
+    self->private_impl.f_n_bits = 0;
+    self->private_impl.f_bits = 0;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_0 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_uncompressed[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_uncompressed[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
+          if (num_bits_0 == 24) {
+            t_0 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0)) << 56;
+        }
+      }
+      v_length = t_0;
+    }
+    if ((((v_length) & 0xFFFF) + ((v_length) >> (32 - (16)))) != 65535) {
+      status = wuffs_base__make_status(wuffs_deflate__error__inconsistent_stored_block_length);
+      goto exit;
+    }
+    v_length = ((v_length) & 0xFFFF);
+    while (true) {
+      v_n_copied = wuffs_base__io_writer__limited_copy_u32_from_reader(
+          &iop_a_dst, io2_a_dst,v_length, &iop_a_src, io2_a_src);
+      if (v_length <= v_n_copied) {
+        status = wuffs_base__make_status(NULL);
+        goto ok;
+      }
+      v_length -= v_n_copied;
+      if (((uint64_t)(io2_a_dst - iop_a_dst)) == 0) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+      } else {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
+      }
+    }
+
+    ok:
+    self->private_impl.p_decode_uncompressed[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_uncompressed[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_uncompressed[0].v_length = v_length;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func deflate.decoder.init_fixed_huffman
+
+static wuffs_base__status
+wuffs_deflate__decoder__init_fixed_huffman(
+    wuffs_deflate__decoder* self) {
+  uint32_t v_i = 0;
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+
+  while (v_i < 144) {
+    self->private_data.f_code_lengths[v_i] = 8;
+    v_i += 1;
+  }
+  while (v_i < 256) {
+    self->private_data.f_code_lengths[v_i] = 9;
+    v_i += 1;
+  }
+  while (v_i < 280) {
+    self->private_data.f_code_lengths[v_i] = 7;
+    v_i += 1;
+  }
+  while (v_i < 288) {
+    self->private_data.f_code_lengths[v_i] = 8;
+    v_i += 1;
+  }
+  while (v_i < 320) {
+    self->private_data.f_code_lengths[v_i] = 5;
+    v_i += 1;
+  }
+  v_status = wuffs_deflate__decoder__init_huff(self,
+      0,
+      0,
+      288,
+      257);
+  if (wuffs_base__status__is_error(&v_status)) {
+    return v_status;
+  }
+  v_status = wuffs_deflate__decoder__init_huff(self,
+      1,
+      288,
+      320,
+      0);
+  if (wuffs_base__status__is_error(&v_status)) {
+    return v_status;
+  }
+  return wuffs_base__make_status(NULL);
+}
+
+// -------- func deflate.decoder.init_dynamic_huffman
+
+static wuffs_base__status
+wuffs_deflate__decoder__init_dynamic_huffman(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_bits = 0;
+  uint32_t v_n_bits = 0;
+  uint32_t v_b0 = 0;
+  uint32_t v_n_lit = 0;
+  uint32_t v_n_dist = 0;
+  uint32_t v_n_clen = 0;
+  uint32_t v_i = 0;
+  uint32_t v_b1 = 0;
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+  uint32_t v_mask = 0;
+  uint32_t v_table_entry = 0;
+  uint32_t v_table_entry_n_bits = 0;
+  uint32_t v_b2 = 0;
+  uint32_t v_n_extra_bits = 0;
+  uint8_t v_rep_symbol = 0;
+  uint32_t v_rep_count = 0;
+  uint32_t v_b3 = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_init_dynamic_huffman[0];
+  if (coro_susp_point) {
+    v_bits = self->private_data.s_init_dynamic_huffman[0].v_bits;
+    v_n_bits = self->private_data.s_init_dynamic_huffman[0].v_n_bits;
+    v_n_lit = self->private_data.s_init_dynamic_huffman[0].v_n_lit;
+    v_n_dist = self->private_data.s_init_dynamic_huffman[0].v_n_dist;
+    v_n_clen = self->private_data.s_init_dynamic_huffman[0].v_n_clen;
+    v_i = self->private_data.s_init_dynamic_huffman[0].v_i;
+    v_mask = self->private_data.s_init_dynamic_huffman[0].v_mask;
+    v_table_entry = self->private_data.s_init_dynamic_huffman[0].v_table_entry;
+    v_n_extra_bits = self->private_data.s_init_dynamic_huffman[0].v_n_extra_bits;
+    v_rep_symbol = self->private_data.s_init_dynamic_huffman[0].v_rep_symbol;
+    v_rep_count = self->private_data.s_init_dynamic_huffman[0].v_rep_count;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    v_bits = self->private_impl.f_bits;
+    v_n_bits = self->private_impl.f_n_bits;
+    while (v_n_bits < 14) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        uint32_t t_0 = *iop_a_src++;
+        v_b0 = t_0;
+      }
+      v_bits |= (v_b0 << v_n_bits);
+      v_n_bits += 8;
+    }
+    v_n_lit = (((v_bits) & 0x1F) + 257);
+    if (v_n_lit > 286) {
+      status = wuffs_base__make_status(wuffs_deflate__error__bad_literal_length_code_count);
+      goto exit;
+    }
+    v_bits >>= 5;
+    v_n_dist = (((v_bits) & 0x1F) + 1);
+    if (v_n_dist > 30) {
+      status = wuffs_base__make_status(wuffs_deflate__error__bad_distance_code_count);
+      goto exit;
+    }
+    v_bits >>= 5;
+    v_n_clen = (((v_bits) & 0xF) + 4);
+    v_bits >>= 4;
+    v_n_bits -= 14;
+    v_i = 0;
+    while (v_i < v_n_clen) {
+      while (v_n_bits < 3) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint32_t t_1 = *iop_a_src++;
+          v_b1 = t_1;
+        }
+        v_bits |= (v_b1 << v_n_bits);
+        v_n_bits += 8;
+      }
+      self->private_data.f_code_lengths[WUFFS_DEFLATE__CODE_ORDER[v_i]] = ((uint8_t)((v_bits & 7)));
+      v_bits >>= 3;
+      v_n_bits -= 3;
+      v_i += 1;
+    }
+    while (v_i < 19) {
+      self->private_data.f_code_lengths[WUFFS_DEFLATE__CODE_ORDER[v_i]] = 0;
+      v_i += 1;
+    }
+    v_status = wuffs_deflate__decoder__init_huff(self,
+        0,
+        0,
+        19,
+        4095);
+    if (wuffs_base__status__is_error(&v_status)) {
+      status = v_status;
+      goto exit;
+    }
+    v_mask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
+    v_i = 0;
+    label__0__continue:;
+    while (v_i < (v_n_lit + v_n_dist)) {
+      while (true) {
+        v_table_entry = self->private_data.f_huffs[0][(v_bits & v_mask)];
+        v_table_entry_n_bits = (v_table_entry & 15);
+        if (v_n_bits >= v_table_entry_n_bits) {
+          v_bits >>= v_table_entry_n_bits;
+          v_n_bits -= v_table_entry_n_bits;
+          goto label__1__break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint32_t t_2 = *iop_a_src++;
+          v_b2 = t_2;
+        }
+        v_bits |= (v_b2 << v_n_bits);
+        v_n_bits += 8;
+      }
+      label__1__break:;
+      if ((v_table_entry >> 24) != 128) {
+        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        goto exit;
+      }
+      v_table_entry = ((v_table_entry >> 8) & 255);
+      if (v_table_entry < 16) {
+        self->private_data.f_code_lengths[v_i] = ((uint8_t)(v_table_entry));
+        v_i += 1;
+        goto label__0__continue;
+      }
+      v_n_extra_bits = 0;
+      v_rep_symbol = 0;
+      v_rep_count = 0;
+      if (v_table_entry == 16) {
+        v_n_extra_bits = 2;
+        if (v_i <= 0) {
+          status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code_length_repetition);
+          goto exit;
+        }
+        v_rep_symbol = (self->private_data.f_code_lengths[(v_i - 1)] & 15);
+        v_rep_count = 3;
+      } else if (v_table_entry == 17) {
+        v_n_extra_bits = 3;
+        v_rep_symbol = 0;
+        v_rep_count = 3;
+      } else if (v_table_entry == 18) {
+        v_n_extra_bits = 7;
+        v_rep_symbol = 0;
+        v_rep_count = 11;
+      } else {
+        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        goto exit;
+      }
+      while (v_n_bits < v_n_extra_bits) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint32_t t_3 = *iop_a_src++;
+          v_b3 = t_3;
+        }
+        v_bits |= (v_b3 << v_n_bits);
+        v_n_bits += 8;
+      }
+      v_rep_count += ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_n_extra_bits));
+      v_bits >>= v_n_extra_bits;
+      v_n_bits -= v_n_extra_bits;
+      while (v_rep_count > 0) {
+        if (v_i >= (v_n_lit + v_n_dist)) {
+          status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code_length_count);
+          goto exit;
+        }
+        self->private_data.f_code_lengths[v_i] = v_rep_symbol;
+        v_i += 1;
+        v_rep_count -= 1;
+      }
+    }
+    if (v_i != (v_n_lit + v_n_dist)) {
+      status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code_length_count);
+      goto exit;
+    }
+    if (self->private_data.f_code_lengths[256] == 0) {
+      status = wuffs_base__make_status(wuffs_deflate__error__missing_end_of_block_code);
+      goto exit;
+    }
+    v_status = wuffs_deflate__decoder__init_huff(self,
+        0,
+        0,
+        v_n_lit,
+        257);
+    if (wuffs_base__status__is_error(&v_status)) {
+      status = v_status;
+      goto exit;
+    }
+    v_status = wuffs_deflate__decoder__init_huff(self,
+        1,
+        v_n_lit,
+        (v_n_lit + v_n_dist),
+        0);
+    if (wuffs_base__status__is_error(&v_status)) {
+      status = v_status;
+      goto exit;
+    }
+    self->private_impl.f_bits = v_bits;
+    self->private_impl.f_n_bits = v_n_bits;
+
+    goto ok;
+    ok:
+    self->private_impl.p_init_dynamic_huffman[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_init_dynamic_huffman[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_init_dynamic_huffman[0].v_bits = v_bits;
+  self->private_data.s_init_dynamic_huffman[0].v_n_bits = v_n_bits;
+  self->private_data.s_init_dynamic_huffman[0].v_n_lit = v_n_lit;
+  self->private_data.s_init_dynamic_huffman[0].v_n_dist = v_n_dist;
+  self->private_data.s_init_dynamic_huffman[0].v_n_clen = v_n_clen;
+  self->private_data.s_init_dynamic_huffman[0].v_i = v_i;
+  self->private_data.s_init_dynamic_huffman[0].v_mask = v_mask;
+  self->private_data.s_init_dynamic_huffman[0].v_table_entry = v_table_entry;
+  self->private_data.s_init_dynamic_huffman[0].v_n_extra_bits = v_n_extra_bits;
+  self->private_data.s_init_dynamic_huffman[0].v_rep_symbol = v_rep_symbol;
+  self->private_data.s_init_dynamic_huffman[0].v_rep_count = v_rep_count;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func deflate.decoder.init_huff
+
+static wuffs_base__status
+wuffs_deflate__decoder__init_huff(
+    wuffs_deflate__decoder* self,
+    uint32_t a_which,
+    uint32_t a_n_codes0,
+    uint32_t a_n_codes1,
+    uint32_t a_base_symbol) {
+  uint16_t v_counts[16] = {0};
+  uint32_t v_i = 0;
+  uint32_t v_remaining = 0;
+  uint16_t v_offsets[16] = {0};
+  uint32_t v_n_symbols = 0;
+  uint32_t v_count = 0;
+  uint16_t v_symbols[320] = {0};
+  uint32_t v_min_cl = 0;
+  uint32_t v_max_cl = 0;
+  uint32_t v_initial_high_bits = 0;
+  uint32_t v_prev_cl = 0;
+  uint32_t v_prev_redirect_key = 0;
+  uint32_t v_top = 0;
+  uint32_t v_next_top = 0;
+  uint32_t v_code = 0;
+  uint32_t v_key = 0;
+  uint32_t v_value = 0;
+  uint32_t v_cl = 0;
+  uint32_t v_redirect_key = 0;
+  uint32_t v_j = 0;
+  uint32_t v_reversed_key = 0;
+  uint32_t v_symbol = 0;
+  uint32_t v_high_bits = 0;
+  uint32_t v_delta = 0;
+
+  v_i = a_n_codes0;
+  while (v_i < a_n_codes1) {
+    if (v_counts[(self->private_data.f_code_lengths[v_i] & 15)] >= 320) {
+      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+    }
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+    v_counts[(self->private_data.f_code_lengths[v_i] & 15)] += 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+    v_i += 1;
+  }
+  if ((((uint32_t)(v_counts[0])) + a_n_codes0) == a_n_codes1) {
+    return wuffs_base__make_status(wuffs_deflate__error__no_huffman_codes);
+  }
+  v_remaining = 1;
+  v_i = 1;
+  while (v_i <= 15) {
+    if (v_remaining > 1073741824) {
+      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+    }
+    v_remaining <<= 1;
+    if (v_remaining < ((uint32_t)(v_counts[v_i]))) {
+      return wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code_over_subscribed);
+    }
+    v_remaining -= ((uint32_t)(v_counts[v_i]));
+    v_i += 1;
+  }
+  if (v_remaining != 0) {
+    if ((a_which == 1) &&
+        (v_counts[1] == 1) &&
+        (self->private_data.f_code_lengths[a_n_codes0] == 1) &&
+        ((((uint32_t)(v_counts[0])) + a_n_codes0 + 1) == a_n_codes1)) {
+      self->private_impl.f_n_huffs_bits[1] = 1;
+      self->private_data.f_huffs[1][0] = (WUFFS_DEFLATE__DCODE_MAGIC_NUMBERS[0] | 1);
+      self->private_data.f_huffs[1][1] = (WUFFS_DEFLATE__DCODE_MAGIC_NUMBERS[31] | 1);
+      return wuffs_base__make_status(NULL);
+    }
+    return wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code_under_subscribed);
+  }
+  v_i = 1;
+  while (v_i <= 15) {
+    v_offsets[v_i] = ((uint16_t)(v_n_symbols));
+    v_count = ((uint32_t)(v_counts[v_i]));
+    if (v_n_symbols > (320 - v_count)) {
+      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+    }
+    v_n_symbols = (v_n_symbols + v_count);
+    v_i += 1;
+  }
+  if (v_n_symbols > 288) {
+    return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+  }
+  v_i = a_n_codes0;
+  while (v_i < a_n_codes1) {
+    if (v_i < a_n_codes0) {
+      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+    }
+    if (self->private_data.f_code_lengths[v_i] != 0) {
+      if (v_offsets[(self->private_data.f_code_lengths[v_i] & 15)] >= 320) {
+        return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+      }
+      v_symbols[v_offsets[(self->private_data.f_code_lengths[v_i] & 15)]] = ((uint16_t)((v_i - a_n_codes0)));
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+      v_offsets[(self->private_data.f_code_lengths[v_i] & 15)] += 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+    }
+    v_i += 1;
+  }
+  v_min_cl = 1;
+  while (true) {
+    if (v_counts[v_min_cl] != 0) {
+      goto label__0__break;
+    }
+    if (v_min_cl >= 9) {
+      return wuffs_base__make_status(wuffs_deflate__error__bad_huffman_minimum_code_length);
+    }
+    v_min_cl += 1;
+  }
+  label__0__break:;
+  v_max_cl = 15;
+  while (true) {
+    if (v_counts[v_max_cl] != 0) {
+      goto label__1__break;
+    }
+    if (v_max_cl <= 1) {
+      return wuffs_base__make_status(wuffs_deflate__error__no_huffman_codes);
+    }
+    v_max_cl -= 1;
+  }
+  label__1__break:;
+  if (v_max_cl <= 9) {
+    self->private_impl.f_n_huffs_bits[a_which] = v_max_cl;
+  } else {
+    self->private_impl.f_n_huffs_bits[a_which] = 9;
+  }
+  v_i = 0;
+  if ((v_n_symbols != ((uint32_t)(v_offsets[v_max_cl]))) || (v_n_symbols != ((uint32_t)(v_offsets[15])))) {
+    return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+  }
+  if ((a_n_codes0 + ((uint32_t)(v_symbols[0]))) >= 320) {
+    return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+  }
+  v_initial_high_bits = 512;
+  if (v_max_cl < 9) {
+    v_initial_high_bits = (((uint32_t)(1)) << v_max_cl);
+  }
+  v_prev_cl = ((uint32_t)((self->private_data.f_code_lengths[(a_n_codes0 + ((uint32_t)(v_symbols[0])))] & 15)));
+  v_prev_redirect_key = 4294967295;
+  v_top = 0;
+  v_next_top = 512;
+  v_code = 0;
+  v_key = 0;
+  v_value = 0;
+  while (true) {
+    if ((a_n_codes0 + ((uint32_t)(v_symbols[v_i]))) >= 320) {
+      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+    }
+    v_cl = ((uint32_t)((self->private_data.f_code_lengths[(a_n_codes0 + ((uint32_t)(v_symbols[v_i])))] & 15)));
+    if (v_cl > v_prev_cl) {
+      v_code <<= (v_cl - v_prev_cl);
+      if (v_code >= 32768) {
+        return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+      }
+    }
+    v_prev_cl = v_cl;
+    v_key = v_code;
+    if (v_cl > 9) {
+      v_cl -= 9;
+      v_redirect_key = ((v_key >> v_cl) & 511);
+      v_key = ((v_key) & WUFFS_BASE__LOW_BITS_MASK__U32(v_cl));
+      if (v_prev_redirect_key != v_redirect_key) {
+        v_prev_redirect_key = v_redirect_key;
+        v_remaining = (((uint32_t)(1)) << v_cl);
+        v_j = v_prev_cl;
+        while (v_j <= 15) {
+          if (v_remaining <= ((uint32_t)(v_counts[v_j]))) {
+            goto label__2__break;
+          }
+          v_remaining -= ((uint32_t)(v_counts[v_j]));
+          if (v_remaining > 1073741824) {
+            return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+          }
+          v_remaining <<= 1;
+          v_j += 1;
+        }
+        label__2__break:;
+        if ((v_j <= 9) || (15 < v_j)) {
+          return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        }
+        v_j -= 9;
+        v_initial_high_bits = (((uint32_t)(1)) << v_j);
+        v_top = v_next_top;
+        if ((v_top + (((uint32_t)(1)) << v_j)) > 1024) {
+          return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        }
+        v_next_top = (v_top + (((uint32_t)(1)) << v_j));
+        v_redirect_key = (((uint32_t)(WUFFS_DEFLATE__REVERSE8[(v_redirect_key >> 1)])) | ((v_redirect_key & 1) << 8));
+        self->private_data.f_huffs[a_which][v_redirect_key] = (268435465 | (v_top << 8) | (v_j << 4));
+      }
+    }
+    if ((v_key >= 512) || (v_counts[v_prev_cl] <= 0)) {
+      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+    }
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+    v_counts[v_prev_cl] -= 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+    v_reversed_key = (((uint32_t)(WUFFS_DEFLATE__REVERSE8[(v_key >> 1)])) | ((v_key & 1) << 8));
+    v_reversed_key >>= (9 - v_cl);
+    v_symbol = ((uint32_t)(v_symbols[v_i]));
+    if (v_symbol == 256) {
+      v_value = (536870912 | v_cl);
+    } else if ((v_symbol < 256) && (a_which == 0)) {
+      v_value = (2147483648 | (v_symbol << 8) | v_cl);
+    } else if (v_symbol >= a_base_symbol) {
+      v_symbol -= a_base_symbol;
+      if (a_which == 0) {
+        v_value = (WUFFS_DEFLATE__LCODE_MAGIC_NUMBERS[(v_symbol & 31)] | v_cl);
+      } else {
+        v_value = (WUFFS_DEFLATE__DCODE_MAGIC_NUMBERS[(v_symbol & 31)] | v_cl);
+      }
+    } else {
+      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+    }
+    v_high_bits = v_initial_high_bits;
+    v_delta = (((uint32_t)(1)) << v_cl);
+    while (v_high_bits >= v_delta) {
+      v_high_bits -= v_delta;
+      if ((v_top + ((v_high_bits | v_reversed_key) & 511)) >= 1024) {
+        return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+      }
+      self->private_data.f_huffs[a_which][(v_top + ((v_high_bits | v_reversed_key) & 511))] = v_value;
+    }
+    v_i += 1;
+    if (v_i >= v_n_symbols) {
+      goto label__3__break;
+    }
+    v_code += 1;
+    if (v_code >= 32768) {
+      return wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+    }
+  }
+  label__3__break:;
+  return wuffs_base__make_status(NULL);
+}
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_bmi2
+// -------- func deflate.decoder.decode_huffman_bmi2
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("bmi2")
+static wuffs_base__status
+wuffs_deflate__decoder__decode_huffman_bmi2(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint64_t v_bits = 0;
+  uint32_t v_n_bits = 0;
+  uint32_t v_table_entry = 0;
+  uint32_t v_table_entry_n_bits = 0;
+  uint64_t v_lmask = 0;
+  uint64_t v_dmask = 0;
+  uint32_t v_redir_top = 0;
+  uint32_t v_redir_mask = 0;
+  uint32_t v_length = 0;
+  uint32_t v_dist_minus_1 = 0;
+  uint32_t v_hlen = 0;
+  uint32_t v_hdist = 0;
+  uint32_t v_hdist_adjustment = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
+    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+    goto exit;
+  }
+  v_bits = ((uint64_t)(self->private_impl.f_bits));
+  v_n_bits = self->private_impl.f_n_bits;
+  v_lmask = ((((uint64_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
+  v_dmask = ((((uint64_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
+  if (self->private_impl.f_transformed_history_count < (a_dst ? a_dst->meta.pos : 0)) {
+    status = wuffs_base__make_status(wuffs_base__error__bad_i_o_position);
+    goto exit;
+  }
+  v_hdist_adjustment = ((uint32_t)(((self->private_impl.f_transformed_history_count - (a_dst ? a_dst->meta.pos : 0)) & 4294967295)));
+  label__loop__continue:;
+  while ((((uint64_t)(io2_a_dst - iop_a_dst)) >= 266) && (((uint64_t)(io2_a_src - iop_a_src)) >= 8)) {
+    v_bits |= ((uint64_t)(wuffs_base__peek_u64le__no_bounds_check(iop_a_src) << (v_n_bits & 63)));
+    iop_a_src += ((63 - (v_n_bits & 63)) >> 3);
+    v_n_bits |= 56;
+    v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
+    v_table_entry_n_bits = (v_table_entry & 15);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    if ((v_table_entry >> 31) != 0) {
+      (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))), iop_a_dst += 1);
+      goto label__loop__continue;
+    } else if ((v_table_entry >> 30) != 0) {
+    } else if ((v_table_entry >> 29) != 0) {
+      self->private_impl.f_end_of_block = true;
+      goto label__loop__break;
+    } else if ((v_table_entry >> 28) != 0) {
+      v_redir_top = ((v_table_entry >> 8) & 65535);
+      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+      v_table_entry = self->private_data.f_huffs[0][((v_redir_top + (((uint32_t)((v_bits & 4294967295))) & v_redir_mask)) & 1023)];
+      v_table_entry_n_bits = (v_table_entry & 15);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+      if ((v_table_entry >> 31) != 0) {
+        (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))), iop_a_dst += 1);
+        goto label__loop__continue;
+      } else if ((v_table_entry >> 30) != 0) {
+      } else if ((v_table_entry >> 29) != 0) {
+        self->private_impl.f_end_of_block = true;
+        goto label__loop__break;
+      } else if ((v_table_entry >> 28) != 0) {
+        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        goto exit;
+      } else if ((v_table_entry >> 27) != 0) {
+        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+        goto exit;
+      } else {
+        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        goto exit;
+      }
+    } else if ((v_table_entry >> 27) != 0) {
+      status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+      goto exit;
+    } else {
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+      goto exit;
+    }
+    v_length = (((v_table_entry >> 8) & 255) + 3);
+    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+    if (v_table_entry_n_bits > 0) {
+      v_length = (((v_length + 253 + ((uint32_t)(((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U64(v_table_entry_n_bits))))) & 255) + 3);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+    }
+    v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
+    v_table_entry_n_bits = (v_table_entry & 15);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    if ((v_table_entry >> 28) == 1) {
+      v_redir_top = ((v_table_entry >> 8) & 65535);
+      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+      v_table_entry = self->private_data.f_huffs[1][((v_redir_top + (((uint32_t)((v_bits & 4294967295))) & v_redir_mask)) & 1023)];
+      v_table_entry_n_bits = (v_table_entry & 15);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+    }
+    if ((v_table_entry >> 24) != 64) {
+      if ((v_table_entry >> 24) == 8) {
+        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+        goto exit;
+      }
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+      goto exit;
+    }
+    v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
+    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+    v_dist_minus_1 = ((v_dist_minus_1 + ((uint32_t)(((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U64(v_table_entry_n_bits))))) & 32767);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    while (true) {
+      if (((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) {
+        v_hlen = 0;
+        v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) - ((uint64_t)(iop_a_dst - io0_a_dst)))));
+        if (v_length > v_hdist) {
+          v_length -= v_hdist;
+          v_hlen = v_hdist;
+        } else {
+          v_hlen = v_length;
+          v_length = 0;
+        }
+        v_hdist += v_hdist_adjustment;
+        if (self->private_impl.f_history_index < v_hdist) {
+          status = wuffs_base__make_status(wuffs_deflate__error__bad_distance);
+          goto exit;
+        }
+        v_hdist = (self->private_impl.f_history_index - v_hdist);
+        wuffs_base__io_writer__limited_copy_u32_from_slice(
+            &iop_a_dst, io2_a_dst,v_hlen, wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 33025), (v_hdist & 32767)));
+        if (v_length == 0) {
+          goto label__loop__continue;
+        }
+        if ((((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) || (((uint64_t)(v_length)) > ((uint64_t)(io2_a_dst - iop_a_dst))) || (((uint64_t)((v_length + 8))) > ((uint64_t)(io2_a_dst - iop_a_dst)))) {
+          status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_distance);
+          goto exit;
+        }
+      }
+      if ((v_dist_minus_1 + 1) >= 8) {
+        wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_fast(
+            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+      } else if ((v_dist_minus_1 + 1) == 1) {
+        wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_distance_1_fast(
+            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+      } else {
+        wuffs_base__io_writer__limited_copy_u32_from_history_fast(
+            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+      }
+      goto label__0__break;
+    }
+    label__0__break:;
+  }
+  label__loop__break:;
+  if (v_n_bits > 63) {
+    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+    goto exit;
+  }
+  while (v_n_bits >= 8) {
+    v_n_bits -= 8;
+    if (iop_a_src > io1_a_src) {
+      iop_a_src--;
+    } else {
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_i_o);
+      goto exit;
+    }
+  }
+  self->private_impl.f_bits = ((uint32_t)((v_bits & ((((uint64_t)(1)) << v_n_bits) - 1))));
+  self->private_impl.f_n_bits = v_n_bits;
+  if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> self->private_impl.f_n_bits) != 0)) {
+    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+    goto exit;
+  }
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_bmi2
+
+// -------- func deflate.decoder.decode_huffman_fast32
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_huffman_fast32(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_bits = 0;
+  uint32_t v_n_bits = 0;
+  uint32_t v_table_entry = 0;
+  uint32_t v_table_entry_n_bits = 0;
+  uint32_t v_lmask = 0;
+  uint32_t v_dmask = 0;
+  uint32_t v_redir_top = 0;
+  uint32_t v_redir_mask = 0;
+  uint32_t v_length = 0;
+  uint32_t v_dist_minus_1 = 0;
+  uint32_t v_hlen = 0;
+  uint32_t v_hdist = 0;
+  uint32_t v_hdist_adjustment = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
+    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+    goto exit;
+  }
+  v_bits = self->private_impl.f_bits;
+  v_n_bits = self->private_impl.f_n_bits;
+  v_lmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
+  v_dmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
+  if (self->private_impl.f_transformed_history_count < (a_dst ? a_dst->meta.pos : 0)) {
+    status = wuffs_base__make_status(wuffs_base__error__bad_i_o_position);
+    goto exit;
+  }
+  v_hdist_adjustment = ((uint32_t)(((self->private_impl.f_transformed_history_count - (a_dst ? a_dst->meta.pos : 0)) & 4294967295)));
+  label__loop__continue:;
+  while ((((uint64_t)(io2_a_dst - iop_a_dst)) >= 266) && (((uint64_t)(io2_a_src - iop_a_src)) >= 12)) {
+    if (v_n_bits < 15) {
+      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+      iop_a_src += 1;
+      v_n_bits += 8;
+      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+      iop_a_src += 1;
+      v_n_bits += 8;
+    } else {
+    }
+    v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
+    v_table_entry_n_bits = (v_table_entry & 15);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    if ((v_table_entry >> 31) != 0) {
+      (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))), iop_a_dst += 1);
+      goto label__loop__continue;
+    } else if ((v_table_entry >> 30) != 0) {
+    } else if ((v_table_entry >> 29) != 0) {
+      self->private_impl.f_end_of_block = true;
+      goto label__loop__break;
+    } else if ((v_table_entry >> 28) != 0) {
+      if (v_n_bits < 15) {
+        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+        iop_a_src += 1;
+        v_n_bits += 8;
+        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+        iop_a_src += 1;
+        v_n_bits += 8;
+      } else {
+      }
+      v_redir_top = ((v_table_entry >> 8) & 65535);
+      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+      v_table_entry = self->private_data.f_huffs[0][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
+      v_table_entry_n_bits = (v_table_entry & 15);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+      if ((v_table_entry >> 31) != 0) {
+        (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))), iop_a_dst += 1);
+        goto label__loop__continue;
+      } else if ((v_table_entry >> 30) != 0) {
+      } else if ((v_table_entry >> 29) != 0) {
+        self->private_impl.f_end_of_block = true;
+        goto label__loop__break;
+      } else if ((v_table_entry >> 28) != 0) {
+        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        goto exit;
+      } else if ((v_table_entry >> 27) != 0) {
+        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+        goto exit;
+      } else {
+        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        goto exit;
+      }
+    } else if ((v_table_entry >> 27) != 0) {
+      status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+      goto exit;
+    } else {
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+      goto exit;
+    }
+    v_length = (((v_table_entry >> 8) & 255) + 3);
+    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+    if (v_table_entry_n_bits > 0) {
+      if (v_n_bits < 15) {
+        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+        iop_a_src += 1;
+        v_n_bits += 8;
+        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+        iop_a_src += 1;
+        v_n_bits += 8;
+      } else {
+      }
+      v_length = (((v_length + 253 + ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) & 255) + 3);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+    } else {
+    }
+    if (v_n_bits < 15) {
+      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+      iop_a_src += 1;
+      v_n_bits += 8;
+      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+      iop_a_src += 1;
+      v_n_bits += 8;
+    } else {
+    }
+    v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
+    v_table_entry_n_bits = (v_table_entry & 15);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    if ((v_table_entry >> 28) == 1) {
+      if (v_n_bits < 15) {
+        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+        iop_a_src += 1;
+        v_n_bits += 8;
+        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+        iop_a_src += 1;
+        v_n_bits += 8;
+      } else {
+      }
+      v_redir_top = ((v_table_entry >> 8) & 65535);
+      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+      v_table_entry = self->private_data.f_huffs[1][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
+      v_table_entry_n_bits = (v_table_entry & 15);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+    } else {
+    }
+    if ((v_table_entry >> 24) != 64) {
+      if ((v_table_entry >> 24) == 8) {
+        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+        goto exit;
+      }
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+      goto exit;
+    }
+    v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
+    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+    if (v_n_bits < v_table_entry_n_bits) {
+      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+      iop_a_src += 1;
+      v_n_bits += 8;
+      v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+      iop_a_src += 1;
+      v_n_bits += 8;
+    }
+    v_dist_minus_1 = ((v_dist_minus_1 + ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) & 32767);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    while (true) {
+      if (((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) {
+        v_hlen = 0;
+        v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) - ((uint64_t)(iop_a_dst - io0_a_dst)))));
+        if (v_length > v_hdist) {
+          v_length -= v_hdist;
+          v_hlen = v_hdist;
+        } else {
+          v_hlen = v_length;
+          v_length = 0;
+        }
+        v_hdist += v_hdist_adjustment;
+        if (self->private_impl.f_history_index < v_hdist) {
+          status = wuffs_base__make_status(wuffs_deflate__error__bad_distance);
+          goto exit;
+        }
+        v_hdist = (self->private_impl.f_history_index - v_hdist);
+        wuffs_base__io_writer__limited_copy_u32_from_slice(
+            &iop_a_dst, io2_a_dst,v_hlen, wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 33025), (v_hdist & 32767)));
+        if (v_length == 0) {
+          goto label__loop__continue;
+        }
+        if ((((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) || (((uint64_t)(v_length)) > ((uint64_t)(io2_a_dst - iop_a_dst))) || (((uint64_t)((v_length + 8))) > ((uint64_t)(io2_a_dst - iop_a_dst)))) {
+          status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_distance);
+          goto exit;
+        }
+      }
+      if ((v_dist_minus_1 + 1) >= 8) {
+        wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_fast(
+            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+      } else {
+        wuffs_base__io_writer__limited_copy_u32_from_history_fast(
+            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+      }
+      goto label__0__break;
+    }
+    label__0__break:;
+  }
+  label__loop__break:;
+  while (v_n_bits >= 8) {
+    v_n_bits -= 8;
+    if (iop_a_src > io1_a_src) {
+      iop_a_src--;
+    } else {
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_i_o);
+      goto exit;
+    }
+  }
+  self->private_impl.f_bits = (v_bits & ((((uint32_t)(1)) << v_n_bits) - 1));
+  self->private_impl.f_n_bits = v_n_bits;
+  if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> self->private_impl.f_n_bits) != 0)) {
+    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+    goto exit;
+  }
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func deflate.decoder.decode_huffman_fast64
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_huffman_fast64(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  return (*self->private_impl.choosy_decode_huffman_fast64)(self, a_dst, a_src);
+}
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_huffman_fast64__choosy_default(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint64_t v_bits = 0;
+  uint32_t v_n_bits = 0;
+  uint32_t v_table_entry = 0;
+  uint32_t v_table_entry_n_bits = 0;
+  uint64_t v_lmask = 0;
+  uint64_t v_dmask = 0;
+  uint32_t v_redir_top = 0;
+  uint32_t v_redir_mask = 0;
+  uint32_t v_length = 0;
+  uint32_t v_dist_minus_1 = 0;
+  uint32_t v_hlen = 0;
+  uint32_t v_hdist = 0;
+  uint32_t v_hdist_adjustment = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
+    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+    goto exit;
+  }
+  v_bits = ((uint64_t)(self->private_impl.f_bits));
+  v_n_bits = self->private_impl.f_n_bits;
+  v_lmask = ((((uint64_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
+  v_dmask = ((((uint64_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
+  if (self->private_impl.f_transformed_history_count < (a_dst ? a_dst->meta.pos : 0)) {
+    status = wuffs_base__make_status(wuffs_base__error__bad_i_o_position);
+    goto exit;
+  }
+  v_hdist_adjustment = ((uint32_t)(((self->private_impl.f_transformed_history_count - (a_dst ? a_dst->meta.pos : 0)) & 4294967295)));
+  label__loop__continue:;
+  while ((((uint64_t)(io2_a_dst - iop_a_dst)) >= 266) && (((uint64_t)(io2_a_src - iop_a_src)) >= 8)) {
+    v_bits |= ((uint64_t)(wuffs_base__peek_u64le__no_bounds_check(iop_a_src) << (v_n_bits & 63)));
+    iop_a_src += ((63 - (v_n_bits & 63)) >> 3);
+    v_n_bits |= 56;
+    v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
+    v_table_entry_n_bits = (v_table_entry & 15);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    if ((v_table_entry >> 31) != 0) {
+      (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))), iop_a_dst += 1);
+      goto label__loop__continue;
+    } else if ((v_table_entry >> 30) != 0) {
+    } else if ((v_table_entry >> 29) != 0) {
+      self->private_impl.f_end_of_block = true;
+      goto label__loop__break;
+    } else if ((v_table_entry >> 28) != 0) {
+      v_redir_top = ((v_table_entry >> 8) & 65535);
+      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+      v_table_entry = self->private_data.f_huffs[0][((v_redir_top + (((uint32_t)((v_bits & 4294967295))) & v_redir_mask)) & 1023)];
+      v_table_entry_n_bits = (v_table_entry & 15);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+      if ((v_table_entry >> 31) != 0) {
+        (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(((v_table_entry >> 8) & 255)))), iop_a_dst += 1);
+        goto label__loop__continue;
+      } else if ((v_table_entry >> 30) != 0) {
+      } else if ((v_table_entry >> 29) != 0) {
+        self->private_impl.f_end_of_block = true;
+        goto label__loop__break;
+      } else if ((v_table_entry >> 28) != 0) {
+        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        goto exit;
+      } else if ((v_table_entry >> 27) != 0) {
+        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+        goto exit;
+      } else {
+        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        goto exit;
+      }
+    } else if ((v_table_entry >> 27) != 0) {
+      status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+      goto exit;
+    } else {
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+      goto exit;
+    }
+    v_length = (((v_table_entry >> 8) & 255) + 3);
+    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+    if (v_table_entry_n_bits > 0) {
+      v_length = (((v_length + 253 + ((uint32_t)(((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U64(v_table_entry_n_bits))))) & 255) + 3);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+    }
+    v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
+    v_table_entry_n_bits = (v_table_entry & 15);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    if ((v_table_entry >> 28) == 1) {
+      v_redir_top = ((v_table_entry >> 8) & 65535);
+      v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+      v_table_entry = self->private_data.f_huffs[1][((v_redir_top + (((uint32_t)((v_bits & 4294967295))) & v_redir_mask)) & 1023)];
+      v_table_entry_n_bits = (v_table_entry & 15);
+      v_bits >>= v_table_entry_n_bits;
+      v_n_bits -= v_table_entry_n_bits;
+    }
+    if ((v_table_entry >> 24) != 64) {
+      if ((v_table_entry >> 24) == 8) {
+        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+        goto exit;
+      }
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+      goto exit;
+    }
+    v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
+    v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+    v_dist_minus_1 = ((v_dist_minus_1 + ((uint32_t)(((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U64(v_table_entry_n_bits))))) & 32767);
+    v_bits >>= v_table_entry_n_bits;
+    v_n_bits -= v_table_entry_n_bits;
+    while (true) {
+      if (((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) {
+        v_hlen = 0;
+        v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) - ((uint64_t)(iop_a_dst - io0_a_dst)))));
+        if (v_length > v_hdist) {
+          v_length -= v_hdist;
+          v_hlen = v_hdist;
+        } else {
+          v_hlen = v_length;
+          v_length = 0;
+        }
+        v_hdist += v_hdist_adjustment;
+        if (self->private_impl.f_history_index < v_hdist) {
+          status = wuffs_base__make_status(wuffs_deflate__error__bad_distance);
+          goto exit;
+        }
+        v_hdist = (self->private_impl.f_history_index - v_hdist);
+        wuffs_base__io_writer__limited_copy_u32_from_slice(
+            &iop_a_dst, io2_a_dst,v_hlen, wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 33025), (v_hdist & 32767)));
+        if (v_length == 0) {
+          goto label__loop__continue;
+        }
+        if ((((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) || (((uint64_t)(v_length)) > ((uint64_t)(io2_a_dst - iop_a_dst))) || (((uint64_t)((v_length + 8))) > ((uint64_t)(io2_a_dst - iop_a_dst)))) {
+          status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_distance);
+          goto exit;
+        }
+      }
+      if ((v_dist_minus_1 + 1) >= 8) {
+        wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_fast(
+            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+      } else if ((v_dist_minus_1 + 1) == 1) {
+        wuffs_base__io_writer__limited_copy_u32_from_history_8_byte_chunks_distance_1_fast(
+            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+      } else {
+        wuffs_base__io_writer__limited_copy_u32_from_history_fast(
+            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+      }
+      goto label__0__break;
+    }
+    label__0__break:;
+  }
+  label__loop__break:;
+  if (v_n_bits > 63) {
+    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+    goto exit;
+  }
+  while (v_n_bits >= 8) {
+    v_n_bits -= 8;
+    if (iop_a_src > io1_a_src) {
+      iop_a_src--;
+    } else {
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_i_o);
+      goto exit;
+    }
+  }
+  self->private_impl.f_bits = ((uint32_t)((v_bits & ((((uint64_t)(1)) << v_n_bits) - 1))));
+  self->private_impl.f_n_bits = v_n_bits;
+  if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> self->private_impl.f_n_bits) != 0)) {
+    status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+    goto exit;
+  }
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func deflate.decoder.decode_huffman_slow
+
+static wuffs_base__status
+wuffs_deflate__decoder__decode_huffman_slow(
+    wuffs_deflate__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_bits = 0;
+  uint32_t v_n_bits = 0;
+  uint32_t v_table_entry = 0;
+  uint32_t v_table_entry_n_bits = 0;
+  uint32_t v_lmask = 0;
+  uint32_t v_dmask = 0;
+  uint32_t v_b0 = 0;
+  uint32_t v_redir_top = 0;
+  uint32_t v_redir_mask = 0;
+  uint32_t v_b1 = 0;
+  uint32_t v_length = 0;
+  uint32_t v_b2 = 0;
+  uint32_t v_b3 = 0;
+  uint32_t v_b4 = 0;
+  uint32_t v_dist_minus_1 = 0;
+  uint32_t v_b5 = 0;
+  uint32_t v_n_copied = 0;
+  uint32_t v_hlen = 0;
+  uint32_t v_hdist = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_huffman_slow[0];
+  if (coro_susp_point) {
+    v_bits = self->private_data.s_decode_huffman_slow[0].v_bits;
+    v_n_bits = self->private_data.s_decode_huffman_slow[0].v_n_bits;
+    v_table_entry = self->private_data.s_decode_huffman_slow[0].v_table_entry;
+    v_table_entry_n_bits = self->private_data.s_decode_huffman_slow[0].v_table_entry_n_bits;
+    v_lmask = self->private_data.s_decode_huffman_slow[0].v_lmask;
+    v_dmask = self->private_data.s_decode_huffman_slow[0].v_dmask;
+    v_redir_top = self->private_data.s_decode_huffman_slow[0].v_redir_top;
+    v_redir_mask = self->private_data.s_decode_huffman_slow[0].v_redir_mask;
+    v_length = self->private_data.s_decode_huffman_slow[0].v_length;
+    v_dist_minus_1 = self->private_data.s_decode_huffman_slow[0].v_dist_minus_1;
+    v_hlen = self->private_data.s_decode_huffman_slow[0].v_hlen;
+    v_hdist = self->private_data.s_decode_huffman_slow[0].v_hdist;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+      goto exit;
+    }
+    v_bits = self->private_impl.f_bits;
+    v_n_bits = self->private_impl.f_n_bits;
+    v_lmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[0]) - 1);
+    v_dmask = ((((uint32_t)(1)) << self->private_impl.f_n_huffs_bits[1]) - 1);
+    label__loop__continue:;
+    while ( ! (self->private_impl.p_decode_huffman_slow[0] != 0)) {
+      while (true) {
+        v_table_entry = self->private_data.f_huffs[0][(v_bits & v_lmask)];
+        v_table_entry_n_bits = (v_table_entry & 15);
+        if (v_n_bits >= v_table_entry_n_bits) {
+          v_bits >>= v_table_entry_n_bits;
+          v_n_bits -= v_table_entry_n_bits;
+          goto label__0__break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint32_t t_0 = *iop_a_src++;
+          v_b0 = t_0;
+        }
+        v_bits |= (v_b0 << v_n_bits);
+        v_n_bits += 8;
+      }
+      label__0__break:;
+      if ((v_table_entry >> 31) != 0) {
+        self->private_data.s_decode_huffman_slow[0].scratch = ((uint8_t)(((v_table_entry >> 8) & 255)));
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        if (iop_a_dst == io2_a_dst) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+          goto suspend;
+        }
+        *iop_a_dst++ = ((uint8_t)(self->private_data.s_decode_huffman_slow[0].scratch));
+        goto label__loop__continue;
+      } else if ((v_table_entry >> 30) != 0) {
+      } else if ((v_table_entry >> 29) != 0) {
+        self->private_impl.f_end_of_block = true;
+        goto label__loop__break;
+      } else if ((v_table_entry >> 28) != 0) {
+        v_redir_top = ((v_table_entry >> 8) & 65535);
+        v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+        while (true) {
+          v_table_entry = self->private_data.f_huffs[0][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
+          v_table_entry_n_bits = (v_table_entry & 15);
+          if (v_n_bits >= v_table_entry_n_bits) {
+            v_bits >>= v_table_entry_n_bits;
+            v_n_bits -= v_table_entry_n_bits;
+            goto label__1__break;
+          }
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint32_t t_1 = *iop_a_src++;
+            v_b1 = t_1;
+          }
+          v_bits |= (v_b1 << v_n_bits);
+          v_n_bits += 8;
+        }
+        label__1__break:;
+        if ((v_table_entry >> 31) != 0) {
+          self->private_data.s_decode_huffman_slow[0].scratch = ((uint8_t)(((v_table_entry >> 8) & 255)));
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+          if (iop_a_dst == io2_a_dst) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+            goto suspend;
+          }
+          *iop_a_dst++ = ((uint8_t)(self->private_data.s_decode_huffman_slow[0].scratch));
+          goto label__loop__continue;
+        } else if ((v_table_entry >> 30) != 0) {
+        } else if ((v_table_entry >> 29) != 0) {
+          self->private_impl.f_end_of_block = true;
+          goto label__loop__break;
+        } else if ((v_table_entry >> 28) != 0) {
+          status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+          goto exit;
+        } else if ((v_table_entry >> 27) != 0) {
+          status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+          goto exit;
+        } else {
+          status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+          goto exit;
+        }
+      } else if ((v_table_entry >> 27) != 0) {
+        status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+        goto exit;
+      } else {
+        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        goto exit;
+      }
+      v_length = (((v_table_entry >> 8) & 255) + 3);
+      v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+      if (v_table_entry_n_bits > 0) {
+        while (v_n_bits < v_table_entry_n_bits) {
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint32_t t_2 = *iop_a_src++;
+            v_b2 = t_2;
+          }
+          v_bits |= (v_b2 << v_n_bits);
+          v_n_bits += 8;
+        }
+        v_length = (((v_length + 253 + ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) & 255) + 3);
+        v_bits >>= v_table_entry_n_bits;
+        v_n_bits -= v_table_entry_n_bits;
+      }
+      while (true) {
+        v_table_entry = self->private_data.f_huffs[1][(v_bits & v_dmask)];
+        v_table_entry_n_bits = (v_table_entry & 15);
+        if (v_n_bits >= v_table_entry_n_bits) {
+          v_bits >>= v_table_entry_n_bits;
+          v_n_bits -= v_table_entry_n_bits;
+          goto label__2__break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint32_t t_3 = *iop_a_src++;
+          v_b3 = t_3;
+        }
+        v_bits |= (v_b3 << v_n_bits);
+        v_n_bits += 8;
+      }
+      label__2__break:;
+      if ((v_table_entry >> 28) == 1) {
+        v_redir_top = ((v_table_entry >> 8) & 65535);
+        v_redir_mask = ((((uint32_t)(1)) << ((v_table_entry >> 4) & 15)) - 1);
+        while (true) {
+          v_table_entry = self->private_data.f_huffs[1][((v_redir_top + (v_bits & v_redir_mask)) & 1023)];
+          v_table_entry_n_bits = (v_table_entry & 15);
+          if (v_n_bits >= v_table_entry_n_bits) {
+            v_bits >>= v_table_entry_n_bits;
+            v_n_bits -= v_table_entry_n_bits;
+            goto label__3__break;
+          }
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint32_t t_4 = *iop_a_src++;
+            v_b4 = t_4;
+          }
+          v_bits |= (v_b4 << v_n_bits);
+          v_n_bits += 8;
+        }
+        label__3__break:;
+      }
+      if ((v_table_entry >> 24) != 64) {
+        if ((v_table_entry >> 24) == 8) {
+          status = wuffs_base__make_status(wuffs_deflate__error__bad_huffman_code);
+          goto exit;
+        }
+        status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_huffman_decoder_state);
+        goto exit;
+      }
+      v_dist_minus_1 = ((v_table_entry >> 8) & 32767);
+      v_table_entry_n_bits = ((v_table_entry >> 4) & 15);
+      if (v_table_entry_n_bits > 0) {
+        while (v_n_bits < v_table_entry_n_bits) {
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint32_t t_5 = *iop_a_src++;
+            v_b5 = t_5;
+          }
+          v_bits |= (v_b5 << v_n_bits);
+          v_n_bits += 8;
+        }
+        v_dist_minus_1 = ((v_dist_minus_1 + ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_table_entry_n_bits))) & 32767);
+        v_bits >>= v_table_entry_n_bits;
+        v_n_bits -= v_table_entry_n_bits;
+      }
+      while (true) {
+        if (((uint64_t)((v_dist_minus_1 + 1))) > ((uint64_t)(iop_a_dst - io0_a_dst))) {
+          v_hdist = ((uint32_t)((((uint64_t)((v_dist_minus_1 + 1))) - ((uint64_t)(iop_a_dst - io0_a_dst)))));
+          if (v_length > v_hdist) {
+            v_length -= v_hdist;
+            v_hlen = v_hdist;
+          } else {
+            v_hlen = v_length;
+            v_length = 0;
+          }
+          v_hdist += ((uint32_t)((((uint64_t)(self->private_impl.f_transformed_history_count - (a_dst ? a_dst->meta.pos : 0))) & 4294967295)));
+          if (self->private_impl.f_history_index < v_hdist) {
+            status = wuffs_base__make_status(wuffs_deflate__error__bad_distance);
+            goto exit;
+          }
+          v_hdist = (self->private_impl.f_history_index - v_hdist);
+          while (true) {
+            v_n_copied = wuffs_base__io_writer__limited_copy_u32_from_slice(
+                &iop_a_dst, io2_a_dst,v_hlen, wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 32768), (v_hdist & 32767)));
+            if (v_hlen <= v_n_copied) {
+              v_hlen = 0;
+              goto label__4__break;
+            }
+            if (v_n_copied > 0) {
+              v_hlen -= v_n_copied;
+              v_hdist = (((uint32_t)(v_hdist + v_n_copied)) & 32767);
+              if (v_hdist == 0) {
+                goto label__4__break;
+              }
+            }
+            status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(9);
+          }
+          label__4__break:;
+          if (v_hlen > 0) {
+            while (true) {
+              v_n_copied = wuffs_base__io_writer__limited_copy_u32_from_slice(
+                  &iop_a_dst, io2_a_dst,v_hlen, wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_history, 32768), (v_hdist & 32767)));
+              if (v_hlen <= v_n_copied) {
+                v_hlen = 0;
+                goto label__5__break;
+              }
+              v_hlen -= v_n_copied;
+              v_hdist += v_n_copied;
+              status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
+            }
+            label__5__break:;
+          }
+          if (v_length == 0) {
+            goto label__loop__continue;
+          }
+        }
+        v_n_copied = wuffs_base__io_writer__limited_copy_u32_from_history(
+            &iop_a_dst, io0_a_dst, io2_a_dst, v_length, (v_dist_minus_1 + 1));
+        if (v_length <= v_n_copied) {
+          v_length = 0;
+          goto label__6__break;
+        }
+        v_length -= v_n_copied;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
+      }
+      label__6__break:;
+    }
+    label__loop__break:;
+    self->private_impl.f_bits = v_bits;
+    self->private_impl.f_n_bits = v_n_bits;
+    if ((self->private_impl.f_n_bits >= 8) || ((self->private_impl.f_bits >> (self->private_impl.f_n_bits & 7)) != 0)) {
+      status = wuffs_base__make_status(wuffs_deflate__error__internal_error_inconsistent_n_bits);
+      goto exit;
+    }
+
+    ok:
+    self->private_impl.p_decode_huffman_slow[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_huffman_slow[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_huffman_slow[0].v_bits = v_bits;
+  self->private_data.s_decode_huffman_slow[0].v_n_bits = v_n_bits;
+  self->private_data.s_decode_huffman_slow[0].v_table_entry = v_table_entry;
+  self->private_data.s_decode_huffman_slow[0].v_table_entry_n_bits = v_table_entry_n_bits;
+  self->private_data.s_decode_huffman_slow[0].v_lmask = v_lmask;
+  self->private_data.s_decode_huffman_slow[0].v_dmask = v_dmask;
+  self->private_data.s_decode_huffman_slow[0].v_redir_top = v_redir_top;
+  self->private_data.s_decode_huffman_slow[0].v_redir_mask = v_redir_mask;
+  self->private_data.s_decode_huffman_slow[0].v_length = v_length;
+  self->private_data.s_decode_huffman_slow[0].v_dist_minus_1 = v_dist_minus_1;
+  self->private_data.s_decode_huffman_slow[0].v_hlen = v_hlen;
+  self->private_data.s_decode_huffman_slow[0].v_hdist = v_hdist;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__DEFLATE)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__LZW)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_lzw__error__bad_code[] = "#lzw: bad code";
+const char wuffs_lzw__error__internal_error_inconsistent_i_o[] = "#lzw: internal error: inconsistent I/O";
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__empty_struct
+wuffs_lzw__decoder__read_from(
+    wuffs_lzw__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_lzw__decoder__write_to(
+    wuffs_lzw__decoder* self,
+    wuffs_base__io_buffer* a_dst);
+
+// ---------------- VTables
+
+const wuffs_base__io_transformer__func_ptrs
+wuffs_lzw__decoder__func_ptrs_for__wuffs_base__io_transformer = {
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_lzw__decoder__set_quirk_enabled),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__io_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__slice_u8))(&wuffs_lzw__decoder__transform_io),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_lzw__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_lzw__decoder__initialize(
+    wuffs_lzw__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__io_transformer.vtable_name =
+      wuffs_base__io_transformer__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__io_transformer.function_pointers =
+      (const void*)(&wuffs_lzw__decoder__func_ptrs_for__wuffs_base__io_transformer);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_lzw__decoder*
+wuffs_lzw__decoder__alloc() {
+  wuffs_lzw__decoder* x =
+      (wuffs_lzw__decoder*)(calloc(sizeof(wuffs_lzw__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_lzw__decoder__initialize(
+      x, sizeof(wuffs_lzw__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_lzw__decoder() {
+  return sizeof(wuffs_lzw__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func lzw.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_lzw__decoder__set_quirk_enabled(
+    wuffs_lzw__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func lzw.decoder.set_literal_width
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_lzw__decoder__set_literal_width(
+    wuffs_lzw__decoder* self,
+    uint32_t a_lw) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (a_lw > 8) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_empty_struct();
+  }
+
+  self->private_impl.f_set_literal_width_arg = (a_lw + 1);
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func lzw.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_lzw__decoder__workbuf_len(
+    const wuffs_lzw__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(0, 0);
+}
+
+// -------- func lzw.decoder.transform_io
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_lzw__decoder__transform_io(
+    wuffs_lzw__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_i = 0;
+
+  uint32_t coro_susp_point = self->private_impl.p_transform_io[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.f_literal_width = 8;
+    if (self->private_impl.f_set_literal_width_arg > 0) {
+      self->private_impl.f_literal_width = (self->private_impl.f_set_literal_width_arg - 1);
+    }
+    self->private_impl.f_clear_code = (((uint32_t)(1)) << self->private_impl.f_literal_width);
+    self->private_impl.f_end_code = (self->private_impl.f_clear_code + 1);
+    self->private_impl.f_save_code = self->private_impl.f_end_code;
+    self->private_impl.f_prev_code = self->private_impl.f_end_code;
+    self->private_impl.f_width = (self->private_impl.f_literal_width + 1);
+    self->private_impl.f_bits = 0;
+    self->private_impl.f_n_bits = 0;
+    self->private_impl.f_output_ri = 0;
+    self->private_impl.f_output_wi = 0;
+    v_i = 0;
+    while (v_i < self->private_impl.f_clear_code) {
+      self->private_data.f_lm1s[v_i] = 0;
+      self->private_data.f_suffixes[v_i][0] = ((uint8_t)(v_i));
+      v_i += 1;
+    }
+    label__0__continue:;
+    while (true) {
+      wuffs_lzw__decoder__read_from(self, a_src);
+      if (self->private_impl.f_output_wi > 0) {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        status = wuffs_lzw__decoder__write_to(self, a_dst);
+        if (status.repr) {
+          goto suspend;
+        }
+      }
+      if (self->private_impl.f_read_from_return_value == 0) {
+        goto label__0__break;
+      } else if (self->private_impl.f_read_from_return_value == 1) {
+        goto label__0__continue;
+      } else if (self->private_impl.f_read_from_return_value == 2) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+      } else if (self->private_impl.f_read_from_return_value == 3) {
+        status = wuffs_base__make_status(wuffs_lzw__error__bad_code);
+        goto exit;
+      } else {
+        status = wuffs_base__make_status(wuffs_lzw__error__internal_error_inconsistent_i_o);
+        goto exit;
+      }
+    }
+    label__0__break:;
+
+    ok:
+    self->private_impl.p_transform_io[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_transform_io[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+
+  goto exit;
+  exit:
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func lzw.decoder.read_from
+
+static wuffs_base__empty_struct
+wuffs_lzw__decoder__read_from(
+    wuffs_lzw__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  uint32_t v_clear_code = 0;
+  uint32_t v_end_code = 0;
+  uint32_t v_save_code = 0;
+  uint32_t v_prev_code = 0;
+  uint32_t v_width = 0;
+  uint32_t v_bits = 0;
+  uint32_t v_n_bits = 0;
+  uint32_t v_output_wi = 0;
+  uint32_t v_code = 0;
+  uint32_t v_c = 0;
+  uint32_t v_o = 0;
+  uint32_t v_steps = 0;
+  uint8_t v_first_byte = 0;
+  uint16_t v_lm1_b = 0;
+  uint16_t v_lm1_a = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  v_clear_code = self->private_impl.f_clear_code;
+  v_end_code = self->private_impl.f_end_code;
+  v_save_code = self->private_impl.f_save_code;
+  v_prev_code = self->private_impl.f_prev_code;
+  v_width = self->private_impl.f_width;
+  v_bits = self->private_impl.f_bits;
+  v_n_bits = self->private_impl.f_n_bits;
+  v_output_wi = self->private_impl.f_output_wi;
+  while (true) {
+    if (v_n_bits < v_width) {
+      if (((uint64_t)(io2_a_src - iop_a_src)) >= 4) {
+        v_bits |= ((uint32_t)(wuffs_base__peek_u32le__no_bounds_check(iop_a_src) << v_n_bits));
+        iop_a_src += ((31 - v_n_bits) >> 3);
+        v_n_bits |= 24;
+      } else if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+        self->private_impl.f_read_from_return_value = 2;
+        goto label__0__break;
+      } else {
+        v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+        iop_a_src += 1;
+        v_n_bits += 8;
+        if (v_n_bits >= v_width) {
+        } else if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          self->private_impl.f_read_from_return_value = 2;
+          goto label__0__break;
+        } else {
+          v_bits |= (((uint32_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src))) << v_n_bits);
+          iop_a_src += 1;
+          v_n_bits += 8;
+          if (v_n_bits < v_width) {
+            self->private_impl.f_read_from_return_value = 4;
+            goto label__0__break;
+          }
+        }
+      }
+    }
+    v_code = ((v_bits) & WUFFS_BASE__LOW_BITS_MASK__U32(v_width));
+    v_bits >>= v_width;
+    v_n_bits -= v_width;
+    if (v_code < v_clear_code) {
+      self->private_data.f_output[v_output_wi] = ((uint8_t)(v_code));
+      v_output_wi = ((v_output_wi + 1) & 8191);
+      if (v_save_code <= 4095) {
+        v_lm1_a = (((uint16_t)(self->private_data.f_lm1s[v_prev_code] + 1)) & 4095);
+        self->private_data.f_lm1s[v_save_code] = v_lm1_a;
+        if ((v_lm1_a % 8) != 0) {
+          self->private_impl.f_prefixes[v_save_code] = self->private_impl.f_prefixes[v_prev_code];
+          memcpy(self->private_data.f_suffixes[v_save_code],self->private_data.f_suffixes[v_prev_code], sizeof(self->private_data.f_suffixes[v_save_code]));
+          self->private_data.f_suffixes[v_save_code][(v_lm1_a % 8)] = ((uint8_t)(v_code));
+        } else {
+          self->private_impl.f_prefixes[v_save_code] = ((uint16_t)(v_prev_code));
+          self->private_data.f_suffixes[v_save_code][0] = ((uint8_t)(v_code));
+        }
+        v_save_code += 1;
+        if (v_width < 12) {
+          v_width += (1 & (v_save_code >> v_width));
+        }
+        v_prev_code = v_code;
+      }
+    } else if (v_code <= v_end_code) {
+      if (v_code == v_end_code) {
+        self->private_impl.f_read_from_return_value = 0;
+        goto label__0__break;
+      }
+      v_save_code = v_end_code;
+      v_prev_code = v_end_code;
+      v_width = (self->private_impl.f_literal_width + 1);
+    } else if (v_code <= v_save_code) {
+      v_c = v_code;
+      if (v_code == v_save_code) {
+        v_c = v_prev_code;
+      }
+      v_o = ((v_output_wi + (((uint32_t)(self->private_data.f_lm1s[v_c])) & 4294967288)) & 8191);
+      v_output_wi = ((v_output_wi + 1 + ((uint32_t)(self->private_data.f_lm1s[v_c]))) & 8191);
+      v_steps = (((uint32_t)(self->private_data.f_lm1s[v_c])) >> 3);
+      while (true) {
+        memcpy((self->private_data.f_output)+(v_o), (self->private_data.f_suffixes[v_c]), 8);
+        if (v_steps <= 0) {
+          goto label__1__break;
+        }
+        v_steps -= 1;
+        v_o = (((uint32_t)(v_o - 8)) & 8191);
+        v_c = ((uint32_t)(self->private_impl.f_prefixes[v_c]));
+      }
+      label__1__break:;
+      v_first_byte = self->private_data.f_suffixes[v_c][0];
+      if (v_code == v_save_code) {
+        self->private_data.f_output[v_output_wi] = v_first_byte;
+        v_output_wi = ((v_output_wi + 1) & 8191);
+      }
+      if (v_save_code <= 4095) {
+        v_lm1_b = (((uint16_t)(self->private_data.f_lm1s[v_prev_code] + 1)) & 4095);
+        self->private_data.f_lm1s[v_save_code] = v_lm1_b;
+        if ((v_lm1_b % 8) != 0) {
+          self->private_impl.f_prefixes[v_save_code] = self->private_impl.f_prefixes[v_prev_code];
+          memcpy(self->private_data.f_suffixes[v_save_code],self->private_data.f_suffixes[v_prev_code], sizeof(self->private_data.f_suffixes[v_save_code]));
+          self->private_data.f_suffixes[v_save_code][(v_lm1_b % 8)] = v_first_byte;
+        } else {
+          self->private_impl.f_prefixes[v_save_code] = ((uint16_t)(v_prev_code));
+          self->private_data.f_suffixes[v_save_code][0] = ((uint8_t)(v_first_byte));
+        }
+        v_save_code += 1;
+        if (v_width < 12) {
+          v_width += (1 & (v_save_code >> v_width));
+        }
+        v_prev_code = v_code;
+      }
+    } else {
+      self->private_impl.f_read_from_return_value = 3;
+      goto label__0__break;
+    }
+    if (v_output_wi > 4095) {
+      self->private_impl.f_read_from_return_value = 1;
+      goto label__0__break;
+    }
+  }
+  label__0__break:;
+  if (self->private_impl.f_read_from_return_value != 2) {
+    while (v_n_bits >= 8) {
+      v_n_bits -= 8;
+      if (iop_a_src > io1_a_src) {
+        iop_a_src--;
+      } else {
+        self->private_impl.f_read_from_return_value = 4;
+        goto label__2__break;
+      }
+    }
+    label__2__break:;
+  }
+  self->private_impl.f_save_code = v_save_code;
+  self->private_impl.f_prev_code = v_prev_code;
+  self->private_impl.f_width = v_width;
+  self->private_impl.f_bits = v_bits;
+  self->private_impl.f_n_bits = v_n_bits;
+  self->private_impl.f_output_wi = v_output_wi;
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func lzw.decoder.write_to
+
+static wuffs_base__status
+wuffs_lzw__decoder__write_to(
+    wuffs_lzw__decoder* self,
+    wuffs_base__io_buffer* a_dst) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  wuffs_base__slice_u8 v_s = {0};
+  uint64_t v_n = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_write_to[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    while (self->private_impl.f_output_wi > 0) {
+      if (self->private_impl.f_output_ri > self->private_impl.f_output_wi) {
+        status = wuffs_base__make_status(wuffs_lzw__error__internal_error_inconsistent_i_o);
+        goto exit;
+      }
+      v_s = wuffs_base__slice_u8__subslice_ij(wuffs_base__make_slice_u8(self->private_data.f_output,
+          8199),
+          self->private_impl.f_output_ri,
+          self->private_impl.f_output_wi);
+      v_n = wuffs_base__io_writer__copy_from_slice(&iop_a_dst, io2_a_dst,v_s);
+      if (v_n == ((uint64_t)(v_s.len))) {
+        self->private_impl.f_output_ri = 0;
+        self->private_impl.f_output_wi = 0;
+        status = wuffs_base__make_status(NULL);
+        goto ok;
+      }
+      self->private_impl.f_output_ri = (((uint32_t)(self->private_impl.f_output_ri + ((uint32_t)((v_n & 4294967295))))) & 8191);
+      status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+    }
+
+    ok:
+    self->private_impl.p_write_to[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_write_to[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func lzw.decoder.flush
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__slice_u8
+wuffs_lzw__decoder__flush(
+    wuffs_lzw__decoder* self) {
+  if (!self) {
+    return wuffs_base__make_slice_u8(NULL, 0);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_slice_u8(NULL, 0);
+  }
+
+  wuffs_base__slice_u8 v_s = {0};
+
+  if (self->private_impl.f_output_ri <= self->private_impl.f_output_wi) {
+    v_s = wuffs_base__slice_u8__subslice_ij(wuffs_base__make_slice_u8(self->private_data.f_output,
+        8199),
+        self->private_impl.f_output_ri,
+        self->private_impl.f_output_wi);
+  }
+  self->private_impl.f_output_ri = 0;
+  self->private_impl.f_output_wi = 0;
+  return v_s;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__LZW)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GIF)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_gif__error__bad_extension_label[] = "#gif: bad extension label";
+const char wuffs_gif__error__bad_frame_size[] = "#gif: bad frame size";
+const char wuffs_gif__error__bad_graphic_control[] = "#gif: bad graphic control";
+const char wuffs_gif__error__bad_header[] = "#gif: bad header";
+const char wuffs_gif__error__bad_literal_width[] = "#gif: bad literal width";
+const char wuffs_gif__error__bad_palette[] = "#gif: bad palette";
+const char wuffs_gif__error__internal_error_inconsistent_ri_wi[] = "#gif: internal error: inconsistent ri/wi";
+
+// ---------------- Private Consts
+
+static const uint32_t
+WUFFS_GIF__INTERLACE_START[5] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  4294967295, 1, 2, 4, 0,
+};
+
+static const uint8_t
+WUFFS_GIF__INTERLACE_DELTA[5] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  1, 2, 4, 8, 8,
+};
+
+static const uint8_t
+WUFFS_GIF__INTERLACE_COUNT[5] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  0, 1, 2, 4, 8,
+};
+
+static const uint8_t
+WUFFS_GIF__ANIMEXTS1DOT0[11] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  65, 78, 73, 77, 69, 88, 84, 83,
+  49, 46, 48,
+};
+
+static const uint8_t
+WUFFS_GIF__NETSCAPE2DOT0[11] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  78, 69, 84, 83, 67, 65, 80, 69,
+  50, 46, 48,
+};
+
+static const uint8_t
+WUFFS_GIF__ICCRGBG1012[11] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  73, 67, 67, 82, 71, 66, 71, 49,
+  48, 49, 50,
+};
+
+static const uint8_t
+WUFFS_GIF__XMPDATAXMP[11] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  88, 77, 80, 32, 68, 97, 116, 97,
+  88, 77, 80,
+};
+
+#define WUFFS_GIF__QUIRKS_BASE 1041635328
+
+#define WUFFS_GIF__QUIRKS_COUNT 7
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__status
+wuffs_gif__decoder__skip_frame(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__empty_struct
+wuffs_gif__decoder__reset_gc(
+    wuffs_gif__decoder* self);
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_up_to_id_part1(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_header(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_lsd(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_extension(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_gif__decoder__skip_blocks(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_ae(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_gc(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_id_part0(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_id_part1(
+    wuffs_gif__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend);
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_id_part2(
+    wuffs_gif__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+
+static wuffs_base__status
+wuffs_gif__decoder__copy_to_image_buffer(
+    wuffs_gif__decoder* self,
+    wuffs_base__pixel_buffer* a_pb,
+    wuffs_base__slice_u8 a_src);
+
+// ---------------- VTables
+
+const wuffs_base__image_decoder__func_ptrs
+wuffs_gif__decoder__func_ptrs_for__wuffs_base__image_decoder = {
+  (wuffs_base__status(*)(void*,
+      wuffs_base__pixel_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__pixel_blend,
+      wuffs_base__slice_u8,
+      wuffs_base__decode_frame_options*))(&wuffs_gif__decoder__decode_frame),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__frame_config*,
+      wuffs_base__io_buffer*))(&wuffs_gif__decoder__decode_frame_config),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__image_config*,
+      wuffs_base__io_buffer*))(&wuffs_gif__decoder__decode_image_config),
+  (wuffs_base__rect_ie_u32(*)(const void*))(&wuffs_gif__decoder__frame_dirty_rect),
+  (uint32_t(*)(const void*))(&wuffs_gif__decoder__num_animation_loops),
+  (uint64_t(*)(const void*))(&wuffs_gif__decoder__num_decoded_frame_configs),
+  (uint64_t(*)(const void*))(&wuffs_gif__decoder__num_decoded_frames),
+  (wuffs_base__status(*)(void*,
+      uint64_t,
+      uint64_t))(&wuffs_gif__decoder__restart_frame),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_gif__decoder__set_quirk_enabled),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_gif__decoder__set_report_metadata),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__io_buffer*,
+      wuffs_base__more_information*,
+      wuffs_base__io_buffer*))(&wuffs_gif__decoder__tell_me_more),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_gif__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_gif__decoder__initialize(
+    wuffs_gif__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  {
+    wuffs_base__status z = wuffs_lzw__decoder__initialize(
+        &self->private_data.f_lzw, sizeof(self->private_data.f_lzw), WUFFS_VERSION, options);
+    if (z.repr) {
+      return z;
+    }
+  }
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__image_decoder.vtable_name =
+      wuffs_base__image_decoder__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__image_decoder.function_pointers =
+      (const void*)(&wuffs_gif__decoder__func_ptrs_for__wuffs_base__image_decoder);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_gif__decoder*
+wuffs_gif__decoder__alloc() {
+  wuffs_gif__decoder* x =
+      (wuffs_gif__decoder*)(calloc(sizeof(wuffs_gif__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_gif__decoder__initialize(
+      x, sizeof(wuffs_gif__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_gif__decoder() {
+  return sizeof(wuffs_gif__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func gif.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_gif__decoder__set_quirk_enabled(
+    wuffs_gif__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if ((self->private_impl.f_call_sequence == 0) && (a_quirk >= 1041635328)) {
+    a_quirk -= 1041635328;
+    if (a_quirk < 7) {
+      self->private_impl.f_quirks[a_quirk] = a_enabled;
+    }
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func gif.decoder.decode_image_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gif__decoder__decode_image_config(
+    wuffs_gif__decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  bool v_ffio = false;
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence == 0) {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_gif__decoder__decode_header(self, a_src);
+      if (status.repr) {
+        goto suspend;
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      status = wuffs_gif__decoder__decode_lsd(self, a_src);
+      if (status.repr) {
+        goto suspend;
+      }
+    } else if (self->private_impl.f_call_sequence != 2) {
+      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+      goto exit;
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+    status = wuffs_gif__decoder__decode_up_to_id_part1(self, a_src);
+    if (status.repr) {
+      goto suspend;
+    }
+    v_ffio =  ! self->private_impl.f_gc_has_transparent_index;
+    if ( ! self->private_impl.f_quirks[2]) {
+      v_ffio = (v_ffio &&
+          (self->private_impl.f_frame_rect_x0 == 0) &&
+          (self->private_impl.f_frame_rect_y0 == 0) &&
+          (self->private_impl.f_frame_rect_x1 == self->private_impl.f_width) &&
+          (self->private_impl.f_frame_rect_y1 == self->private_impl.f_height));
+    } else if (v_ffio) {
+      self->private_impl.f_black_color_u32_argb_premul = 4278190080;
+    }
+    if (self->private_impl.f_background_color_u32_argb_premul == 77) {
+      self->private_impl.f_background_color_u32_argb_premul = self->private_impl.f_black_color_u32_argb_premul;
+    }
+    if (a_dst != NULL) {
+      wuffs_base__image_config__set(
+          a_dst,
+          2198077448,
+          0,
+          self->private_impl.f_width,
+          self->private_impl.f_height,
+          self->private_impl.f_frame_config_io_position,
+          v_ffio);
+    }
+    self->private_impl.f_call_sequence = 3;
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_image_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_image_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+
+  goto exit;
+  exit:
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func gif.decoder.set_report_metadata
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_gif__decoder__set_report_metadata(
+    wuffs_gif__decoder* self,
+    uint32_t a_fourcc,
+    bool a_report) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (a_fourcc == 1229144912) {
+    self->private_impl.f_report_metadata_iccp = a_report;
+  } else if (a_fourcc == 1481461792) {
+    self->private_impl.f_report_metadata_xmp = a_report;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func gif.decoder.tell_me_more
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gif__decoder__tell_me_more(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 2)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint64_t v_chunk_length = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_tell_me_more[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence != 1) {
+      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+      goto exit;
+    }
+    if (self->private_impl.f_metadata_fourcc == 0) {
+      status = wuffs_base__make_status(wuffs_base__error__no_more_information);
+      goto exit;
+    }
+    while (true) {
+      label__0__continue:;
+      while (true) {
+        if (wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src))) != self->private_impl.f_metadata_io_position) {
+          if (a_minfo != NULL) {
+            wuffs_base__more_information__set(a_minfo,
+                2,
+                0,
+                self->private_impl.f_metadata_io_position,
+                0,
+                0);
+          }
+          status = wuffs_base__make_status(wuffs_base__suspension__mispositioned_read);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+          goto label__0__continue;
+        }
+        if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          if (a_minfo != NULL) {
+            wuffs_base__more_information__set(a_minfo,
+                0,
+                0,
+                0,
+                0,
+                0);
+          }
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+          goto label__0__continue;
+        }
+        goto label__0__break;
+      }
+      label__0__break:;
+      v_chunk_length = ((uint64_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src)));
+      if (v_chunk_length <= 0) {
+        iop_a_src += 1;
+        goto label__1__break;
+      }
+      if (self->private_impl.f_metadata_fourcc == 1481461792) {
+        v_chunk_length += 1;
+      } else {
+        iop_a_src += 1;
+      }
+      self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add(wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src))), v_chunk_length);
+      if (a_minfo != NULL) {
+        wuffs_base__more_information__set(a_minfo,
+            3,
+            self->private_impl.f_metadata_fourcc,
+            0,
+            wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src))),
+            self->private_impl.f_metadata_io_position);
+      }
+      status = wuffs_base__make_status(wuffs_base__suspension__even_more_information);
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+    }
+    label__1__break:;
+    if (a_minfo != NULL) {
+      wuffs_base__more_information__set(a_minfo,
+          3,
+          self->private_impl.f_metadata_fourcc,
+          0,
+          self->private_impl.f_metadata_io_position,
+          self->private_impl.f_metadata_io_position);
+    }
+    self->private_impl.f_call_sequence = 2;
+    self->private_impl.f_metadata_fourcc = 0;
+    self->private_impl.f_metadata_io_position = 0;
+    status = wuffs_base__make_status(NULL);
+    goto ok;
+
+    ok:
+    self->private_impl.p_tell_me_more[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_tell_me_more[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 2 : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func gif.decoder.num_animation_loops
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_gif__decoder__num_animation_loops(
+    const wuffs_gif__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  if (self->private_impl.f_seen_num_animation_loops_value) {
+    return self->private_impl.f_num_animation_loops_value;
+  }
+  return 1;
+}
+
+// -------- func gif.decoder.num_decoded_frame_configs
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_gif__decoder__num_decoded_frame_configs(
+    const wuffs_gif__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return self->private_impl.f_num_decoded_frame_configs_value;
+}
+
+// -------- func gif.decoder.num_decoded_frames
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_gif__decoder__num_decoded_frames(
+    const wuffs_gif__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return self->private_impl.f_num_decoded_frames_value;
+}
+
+// -------- func gif.decoder.frame_dirty_rect
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_gif__decoder__frame_dirty_rect(
+    const wuffs_gif__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+
+  return wuffs_base__utility__make_rect_ie_u32(
+      wuffs_base__u32__min(self->private_impl.f_frame_rect_x0, self->private_impl.f_width),
+      wuffs_base__u32__min(self->private_impl.f_frame_rect_y0, self->private_impl.f_height),
+      wuffs_base__u32__min(self->private_impl.f_frame_rect_x1, self->private_impl.f_width),
+      wuffs_base__u32__min(self->private_impl.f_dirty_max_excl_y, self->private_impl.f_height));
+}
+
+// -------- func gif.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_gif__decoder__workbuf_len(
+    const wuffs_gif__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(0, 0);
+}
+
+// -------- func gif.decoder.restart_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gif__decoder__restart_frame(
+    wuffs_gif__decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+
+  if (self->private_impl.f_call_sequence < 3) {
+    return wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+  }
+  self->private_impl.f_delayed_num_decoded_frames = false;
+  self->private_impl.f_end_of_data = false;
+  self->private_impl.f_restarted = true;
+  self->private_impl.f_frame_config_io_position = a_io_position;
+  self->private_impl.f_num_decoded_frame_configs_value = a_index;
+  self->private_impl.f_num_decoded_frames_value = a_index;
+  wuffs_gif__decoder__reset_gc(self);
+  return wuffs_base__make_status(NULL);
+}
+
+// -------- func gif.decoder.decode_frame_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gif__decoder__decode_frame_config(
+    wuffs_gif__decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 3)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_background_color = 0;
+  uint8_t v_flags = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
+  if (coro_susp_point) {
+    v_background_color = self->private_data.s_decode_frame_config[0].v_background_color;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.f_ignore_metadata = true;
+    self->private_impl.f_dirty_max_excl_y = 0;
+    if ( ! self->private_impl.f_end_of_data) {
+      if (self->private_impl.f_call_sequence == 0) {
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        status = wuffs_gif__decoder__decode_image_config(self, NULL, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+      } else if (self->private_impl.f_call_sequence != 3) {
+        if (self->private_impl.f_call_sequence == 4) {
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          status = wuffs_gif__decoder__skip_frame(self, a_src);
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+          if (status.repr) {
+            goto suspend;
+          }
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+        status = wuffs_gif__decoder__decode_up_to_id_part1(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+      }
+    }
+    if (self->private_impl.f_end_of_data) {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    }
+    v_background_color = self->private_impl.f_black_color_u32_argb_premul;
+    if ( ! self->private_impl.f_gc_has_transparent_index) {
+      v_background_color = self->private_impl.f_background_color_u32_argb_premul;
+      if (self->private_impl.f_quirks[1] && (self->private_impl.f_num_decoded_frame_configs_value == 0)) {
+        while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
+        }
+        v_flags = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+        if ((v_flags & 128) != 0) {
+          v_background_color = self->private_impl.f_black_color_u32_argb_premul;
+        }
+      }
+    }
+    if (a_dst != NULL) {
+      wuffs_base__frame_config__set(
+          a_dst,
+          wuffs_base__utility__make_rect_ie_u32(
+          wuffs_base__u32__min(self->private_impl.f_frame_rect_x0, self->private_impl.f_width),
+          wuffs_base__u32__min(self->private_impl.f_frame_rect_y0, self->private_impl.f_height),
+          wuffs_base__u32__min(self->private_impl.f_frame_rect_x1, self->private_impl.f_width),
+          wuffs_base__u32__min(self->private_impl.f_frame_rect_y1, self->private_impl.f_height)),
+          ((wuffs_base__flicks)(self->private_impl.f_gc_duration)),
+          self->private_impl.f_num_decoded_frame_configs_value,
+          self->private_impl.f_frame_config_io_position,
+          self->private_impl.f_gc_disposal,
+          ! self->private_impl.f_gc_has_transparent_index,
+          false,
+          v_background_color);
+    }
+    wuffs_base__u64__sat_add_indirect(&self->private_impl.f_num_decoded_frame_configs_value, 1);
+    self->private_impl.f_call_sequence = 4;
+
+    ok:
+    self->private_impl.p_decode_frame_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_frame_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 3 : 0;
+  self->private_data.s_decode_frame_config[0].v_background_color = v_background_color;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func gif.decoder.skip_frame
+
+static wuffs_base__status
+wuffs_gif__decoder__skip_frame(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_flags = 0;
+  uint8_t v_lw = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_skip_frame[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_flags = t_0;
+    }
+    if ((v_flags & 128) != 0) {
+      self->private_data.s_skip_frame[0].scratch = (((uint32_t)(3)) << (1 + (v_flags & 7)));
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      if (self->private_data.s_skip_frame[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_skip_frame[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_skip_frame[0].scratch;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_1 = *iop_a_src++;
+      v_lw = t_1;
+    }
+    if (v_lw > 8) {
+      status = wuffs_base__make_status(wuffs_gif__error__bad_literal_width);
+      goto exit;
+    }
+    if (a_src) {
+      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+    status = wuffs_gif__decoder__skip_blocks(self, a_src);
+    if (a_src) {
+      iop_a_src = a_src->data.ptr + a_src->meta.ri;
+    }
+    if (status.repr) {
+      goto suspend;
+    }
+    if (self->private_impl.f_quirks[0]) {
+      self->private_impl.f_delayed_num_decoded_frames = true;
+    } else {
+      wuffs_base__u64__sat_add_indirect(&self->private_impl.f_num_decoded_frames_value, 1);
+    }
+    wuffs_gif__decoder__reset_gc(self);
+
+    goto ok;
+    ok:
+    self->private_impl.p_skip_frame[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_skip_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gif__decoder__decode_frame(
+    wuffs_gif__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 4)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.f_ignore_metadata = true;
+    if (self->private_impl.f_call_sequence != 4) {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_gif__decoder__decode_frame_config(self, NULL, a_src);
+      if (status.repr) {
+        goto suspend;
+      }
+    }
+    if (self->private_impl.f_quirks[5] && ((self->private_impl.f_frame_rect_x0 == self->private_impl.f_frame_rect_x1) || (self->private_impl.f_frame_rect_y0 == self->private_impl.f_frame_rect_y1))) {
+      status = wuffs_base__make_status(wuffs_gif__error__bad_frame_size);
+      goto exit;
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+    status = wuffs_gif__decoder__decode_id_part1(self, a_dst, a_src, a_blend);
+    if (status.repr) {
+      goto suspend;
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+    status = wuffs_gif__decoder__decode_id_part2(self, a_dst, a_src, a_workbuf);
+    if (status.repr) {
+      goto suspend;
+    }
+    wuffs_base__u64__sat_add_indirect(&self->private_impl.f_num_decoded_frames_value, 1);
+    wuffs_gif__decoder__reset_gc(self);
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_frame[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 4 : 0;
+
+  goto exit;
+  exit:
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func gif.decoder.reset_gc
+
+static wuffs_base__empty_struct
+wuffs_gif__decoder__reset_gc(
+    wuffs_gif__decoder* self) {
+  self->private_impl.f_call_sequence = 5;
+  self->private_impl.f_gc_has_transparent_index = false;
+  self->private_impl.f_gc_transparent_index = 0;
+  self->private_impl.f_gc_disposal = 0;
+  self->private_impl.f_gc_duration = 0;
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func gif.decoder.decode_up_to_id_part1
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_up_to_id_part1(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_block_type = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_up_to_id_part1[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if ( ! self->private_impl.f_restarted) {
+      if (self->private_impl.f_call_sequence != 2) {
+        self->private_impl.f_frame_config_io_position = wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)));
+      }
+    } else if (self->private_impl.f_frame_config_io_position != wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)))) {
+      status = wuffs_base__make_status(wuffs_base__error__bad_restart);
+      goto exit;
+    } else {
+      self->private_impl.f_restarted = false;
+    }
+    while (true) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_block_type = t_0;
+      }
+      if (v_block_type == 33) {
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        status = wuffs_gif__decoder__decode_extension(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+      } else if (v_block_type == 44) {
+        if (self->private_impl.f_delayed_num_decoded_frames) {
+          self->private_impl.f_delayed_num_decoded_frames = false;
+          wuffs_base__u64__sat_add_indirect(&self->private_impl.f_num_decoded_frames_value, 1);
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+        status = wuffs_gif__decoder__decode_id_part0(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+        goto label__0__break;
+      } else {
+        if (self->private_impl.f_delayed_num_decoded_frames) {
+          self->private_impl.f_delayed_num_decoded_frames = false;
+          wuffs_base__u64__sat_add_indirect(&self->private_impl.f_num_decoded_frames_value, 1);
+        }
+        self->private_impl.f_end_of_data = true;
+        goto label__0__break;
+      }
+    }
+    label__0__break:;
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_up_to_id_part1[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_up_to_id_part1[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_header
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_header(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_c[6] = {0};
+  uint32_t v_i = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_header[0];
+  if (coro_susp_point) {
+    memcpy(v_c, self->private_data.s_decode_header[0].v_c, sizeof(v_c));
+    v_i = self->private_data.s_decode_header[0].v_i;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    while (v_i < 6) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_c[v_i] = t_0;
+      }
+      v_i += 1;
+    }
+    if ((v_c[0] != 71) ||
+        (v_c[1] != 73) ||
+        (v_c[2] != 70) ||
+        (v_c[3] != 56) ||
+        ((v_c[4] != 55) && (v_c[4] != 57)) ||
+        (v_c[5] != 97)) {
+      status = wuffs_base__make_status(wuffs_gif__error__bad_header);
+      goto exit;
+    }
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_header[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_header[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  memcpy(self->private_data.s_decode_header[0].v_c, v_c, sizeof(v_c));
+  self->private_data.s_decode_header[0].v_i = v_i;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_lsd
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_lsd(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_flags = 0;
+  uint8_t v_background_color_index = 0;
+  uint32_t v_num_palette_entries = 0;
+  uint32_t v_i = 0;
+  uint32_t v_j = 0;
+  uint32_t v_argb = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_lsd[0];
+  if (coro_susp_point) {
+    v_flags = self->private_data.s_decode_lsd[0].v_flags;
+    v_background_color_index = self->private_data.s_decode_lsd[0].v_background_color_index;
+    v_num_palette_entries = self->private_data.s_decode_lsd[0].v_num_palette_entries;
+    v_i = self->private_data.s_decode_lsd[0].v_i;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_0 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_lsd[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
+          if (num_bits_0 == 8) {
+            t_0 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0)) << 56;
+        }
+      }
+      self->private_impl.f_width = t_0;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint32_t t_1;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_1 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_lsd[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
+          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
+          if (num_bits_1 == 8) {
+            t_1 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_1 += 8;
+          *scratch |= ((uint64_t)(num_bits_1)) << 56;
+        }
+      }
+      self->private_impl.f_height = t_1;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_2 = *iop_a_src++;
+      v_flags = t_2;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_3 = *iop_a_src++;
+      v_background_color_index = t_3;
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+    if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+      goto suspend;
+    }
+    iop_a_src++;
+    v_i = 0;
+    self->private_impl.f_has_global_palette = ((v_flags & 128) != 0);
+    if (self->private_impl.f_has_global_palette) {
+      v_num_palette_entries = (((uint32_t)(1)) << (1 + (v_flags & 7)));
+      while (v_i < v_num_palette_entries) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+          uint32_t t_4;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
+            t_4 = ((uint32_t)(wuffs_base__peek_u24be__no_bounds_check(iop_a_src)));
+            iop_a_src += 3;
+          } else {
+            self->private_data.s_decode_lsd[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_lsd[0].scratch;
+              uint32_t num_bits_4 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_4);
+              if (num_bits_4 == 16) {
+                t_4 = ((uint32_t)(*scratch >> 40));
+                break;
+              }
+              num_bits_4 += 8;
+              *scratch |= ((uint64_t)(num_bits_4));
+            }
+          }
+          v_argb = t_4;
+        }
+        v_argb |= 4278190080;
+        self->private_data.f_palettes[0][((4 * v_i) + 0)] = ((uint8_t)(((v_argb >> 0) & 255)));
+        self->private_data.f_palettes[0][((4 * v_i) + 1)] = ((uint8_t)(((v_argb >> 8) & 255)));
+        self->private_data.f_palettes[0][((4 * v_i) + 2)] = ((uint8_t)(((v_argb >> 16) & 255)));
+        self->private_data.f_palettes[0][((4 * v_i) + 3)] = ((uint8_t)(((v_argb >> 24) & 255)));
+        v_i += 1;
+      }
+      if (self->private_impl.f_quirks[2]) {
+        if ((v_background_color_index != 0) && (((uint32_t)(v_background_color_index)) < v_num_palette_entries)) {
+          v_j = (4 * ((uint32_t)(v_background_color_index)));
+          self->private_impl.f_background_color_u32_argb_premul = ((((uint32_t)(self->private_data.f_palettes[0][(v_j + 0)])) << 0) |
+              (((uint32_t)(self->private_data.f_palettes[0][(v_j + 1)])) << 8) |
+              (((uint32_t)(self->private_data.f_palettes[0][(v_j + 2)])) << 16) |
+              (((uint32_t)(self->private_data.f_palettes[0][(v_j + 3)])) << 24));
+        } else {
+          self->private_impl.f_background_color_u32_argb_premul = 77;
+        }
+      }
+    }
+    while (v_i < 256) {
+      self->private_data.f_palettes[0][((4 * v_i) + 0)] = 0;
+      self->private_data.f_palettes[0][((4 * v_i) + 1)] = 0;
+      self->private_data.f_palettes[0][((4 * v_i) + 2)] = 0;
+      self->private_data.f_palettes[0][((4 * v_i) + 3)] = 255;
+      v_i += 1;
+    }
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_lsd[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_lsd[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_lsd[0].v_flags = v_flags;
+  self->private_data.s_decode_lsd[0].v_background_color_index = v_background_color_index;
+  self->private_data.s_decode_lsd[0].v_num_palette_entries = v_num_palette_entries;
+  self->private_data.s_decode_lsd[0].v_i = v_i;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_extension
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_extension(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_label = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_extension[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_label = t_0;
+    }
+    if (v_label == 249) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      status = wuffs_gif__decoder__decode_gc(self, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+      status = wuffs_base__make_status(NULL);
+      goto ok;
+    } else if (v_label == 255) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      status = wuffs_gif__decoder__decode_ae(self, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+      status = wuffs_base__make_status(NULL);
+      goto ok;
+    }
+    if (a_src) {
+      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+    status = wuffs_gif__decoder__skip_blocks(self, a_src);
+    if (a_src) {
+      iop_a_src = a_src->data.ptr + a_src->meta.ri;
+    }
+    if (status.repr) {
+      goto suspend;
+    }
+
+    ok:
+    self->private_impl.p_decode_extension[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_extension[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.skip_blocks
+
+static wuffs_base__status
+wuffs_gif__decoder__skip_blocks(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_block_size = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_skip_blocks[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    while (true) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_block_size = t_0;
+      }
+      if (v_block_size == 0) {
+        status = wuffs_base__make_status(NULL);
+        goto ok;
+      }
+      self->private_data.s_skip_blocks[0].scratch = ((uint32_t)(v_block_size));
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      if (self->private_data.s_skip_blocks[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_skip_blocks[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_skip_blocks[0].scratch;
+    }
+
+    ok:
+    self->private_impl.p_skip_blocks[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_skip_blocks[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_ae
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_ae(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_c = 0;
+  uint8_t v_block_size = 0;
+  bool v_is_animexts = false;
+  bool v_is_netscape = false;
+  bool v_is_iccp = false;
+  bool v_is_xmp = false;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_ae[0];
+  if (coro_susp_point) {
+    v_block_size = self->private_data.s_decode_ae[0].v_block_size;
+    v_is_animexts = self->private_data.s_decode_ae[0].v_is_animexts;
+    v_is_netscape = self->private_data.s_decode_ae[0].v_is_netscape;
+    v_is_iccp = self->private_data.s_decode_ae[0].v_is_iccp;
+    v_is_xmp = self->private_data.s_decode_ae[0].v_is_xmp;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    while (true) {
+      if (self->private_impl.f_metadata_fourcc != 0) {
+        status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
+        goto ok;
+      }
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_block_size = t_0;
+      }
+      if (v_block_size == 0) {
+        status = wuffs_base__make_status(NULL);
+        goto ok;
+      }
+      if (v_block_size != 11) {
+        self->private_data.s_decode_ae[0].scratch = ((uint32_t)(v_block_size));
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        if (self->private_data.s_decode_ae[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+          self->private_data.s_decode_ae[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+          iop_a_src = io2_a_src;
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        iop_a_src += self->private_data.s_decode_ae[0].scratch;
+        goto label__goto_done__break;
+      }
+      v_is_animexts = true;
+      v_is_netscape = true;
+      v_is_iccp = true;
+      v_is_xmp = true;
+      v_block_size = 0;
+      while (v_block_size < 11) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint8_t t_1 = *iop_a_src++;
+          v_c = t_1;
+        }
+        v_is_animexts = (v_is_animexts && (v_c == WUFFS_GIF__ANIMEXTS1DOT0[v_block_size]));
+        v_is_netscape = (v_is_netscape && (v_c == WUFFS_GIF__NETSCAPE2DOT0[v_block_size]));
+        v_is_iccp = (v_is_iccp && (v_c == WUFFS_GIF__ICCRGBG1012[v_block_size]));
+        v_is_xmp = (v_is_xmp && (v_c == WUFFS_GIF__XMPDATAXMP[v_block_size]));
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+        v_block_size += 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+      }
+      if (v_is_animexts || v_is_netscape) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint8_t t_2 = *iop_a_src++;
+          v_block_size = t_2;
+        }
+        if (v_block_size != 3) {
+          self->private_data.s_decode_ae[0].scratch = ((uint32_t)(v_block_size));
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+          if (self->private_data.s_decode_ae[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+            self->private_data.s_decode_ae[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+            iop_a_src = io2_a_src;
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          iop_a_src += self->private_data.s_decode_ae[0].scratch;
+          goto label__goto_done__break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint8_t t_3 = *iop_a_src++;
+          v_c = t_3;
+        }
+        if (v_c != 1) {
+          self->private_data.s_decode_ae[0].scratch = 2;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+          if (self->private_data.s_decode_ae[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+            self->private_data.s_decode_ae[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+            iop_a_src = io2_a_src;
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          iop_a_src += self->private_data.s_decode_ae[0].scratch;
+          goto label__goto_done__break;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+          uint32_t t_4;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+            t_4 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+            iop_a_src += 2;
+          } else {
+            self->private_data.s_decode_ae[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_ae[0].scratch;
+              uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
+              *scratch <<= 8;
+              *scratch >>= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
+              if (num_bits_4 == 8) {
+                t_4 = ((uint32_t)(*scratch));
+                break;
+              }
+              num_bits_4 += 8;
+              *scratch |= ((uint64_t)(num_bits_4)) << 56;
+            }
+          }
+          self->private_impl.f_num_animation_loops_value = t_4;
+        }
+        self->private_impl.f_seen_num_animation_loops_value = true;
+        if ((0 < self->private_impl.f_num_animation_loops_value) && (self->private_impl.f_num_animation_loops_value <= 65535)) {
+          self->private_impl.f_num_animation_loops_value += 1;
+        }
+      } else if (self->private_impl.f_ignore_metadata) {
+      } else if (v_is_iccp && self->private_impl.f_report_metadata_iccp) {
+        self->private_impl.f_metadata_fourcc = 1229144912;
+        self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)));
+        self->private_impl.f_call_sequence = 1;
+        status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
+        goto ok;
+      } else if (v_is_xmp && self->private_impl.f_report_metadata_xmp) {
+        self->private_impl.f_metadata_fourcc = 1481461792;
+        self->private_impl.f_metadata_io_position = wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)));
+        self->private_impl.f_call_sequence = 1;
+        status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
+        goto ok;
+      }
+      goto label__goto_done__break;
+    }
+    label__goto_done__break:;
+    if (a_src) {
+      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+    }
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
+    status = wuffs_gif__decoder__skip_blocks(self, a_src);
+    if (a_src) {
+      iop_a_src = a_src->data.ptr + a_src->meta.ri;
+    }
+    if (status.repr) {
+      goto suspend;
+    }
+
+    ok:
+    self->private_impl.p_decode_ae[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_ae[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_ae[0].v_block_size = v_block_size;
+  self->private_data.s_decode_ae[0].v_is_animexts = v_is_animexts;
+  self->private_data.s_decode_ae[0].v_is_netscape = v_is_netscape;
+  self->private_data.s_decode_ae[0].v_is_iccp = v_is_iccp;
+  self->private_data.s_decode_ae[0].v_is_xmp = v_is_xmp;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_gc
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_gc(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_c = 0;
+  uint8_t v_flags = 0;
+  uint16_t v_gc_duration_centiseconds = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_gc[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_c = t_0;
+    }
+    if (v_c != 4) {
+      status = wuffs_base__make_status(wuffs_gif__error__bad_graphic_control);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_1 = *iop_a_src++;
+      v_flags = t_1;
+    }
+    self->private_impl.f_gc_has_transparent_index = ((v_flags & 1) != 0);
+    v_flags = ((v_flags >> 2) & 7);
+    if (v_flags == 2) {
+      self->private_impl.f_gc_disposal = 1;
+    } else if ((v_flags == 3) || (v_flags == 4)) {
+      self->private_impl.f_gc_disposal = 2;
+    } else {
+      self->private_impl.f_gc_disposal = 0;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint16_t t_2;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_2 = wuffs_base__peek_u16le__no_bounds_check(iop_a_src);
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_gc[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_gc[0].scratch;
+          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
+          if (num_bits_2 == 8) {
+            t_2 = ((uint16_t)(*scratch));
+            break;
+          }
+          num_bits_2 += 8;
+          *scratch |= ((uint64_t)(num_bits_2)) << 56;
+        }
+      }
+      v_gc_duration_centiseconds = t_2;
+    }
+    self->private_impl.f_gc_duration = (((uint64_t)(v_gc_duration_centiseconds)) * 7056000);
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_3 = *iop_a_src++;
+      self->private_impl.f_gc_transparent_index = t_3;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_4 = *iop_a_src++;
+      v_c = t_4;
+    }
+    if (v_c != 0) {
+      status = wuffs_base__make_status(wuffs_gif__error__bad_graphic_control);
+      goto exit;
+    }
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_gc[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_gc[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_id_part0
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_id_part0(
+    wuffs_gif__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_id_part0[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_0 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_id_part0[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
+          if (num_bits_0 == 8) {
+            t_0 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0)) << 56;
+        }
+      }
+      self->private_impl.f_frame_rect_x0 = t_0;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint32_t t_1;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_1 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_id_part0[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
+          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
+          if (num_bits_1 == 8) {
+            t_1 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_1 += 8;
+          *scratch |= ((uint64_t)(num_bits_1)) << 56;
+        }
+      }
+      self->private_impl.f_frame_rect_y0 = t_1;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      uint32_t t_2;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_2 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_id_part0[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
+          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
+          if (num_bits_2 == 8) {
+            t_2 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_2 += 8;
+          *scratch |= ((uint64_t)(num_bits_2)) << 56;
+        }
+      }
+      self->private_impl.f_frame_rect_x1 = t_2;
+    }
+    self->private_impl.f_frame_rect_x1 += self->private_impl.f_frame_rect_x0;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+      uint32_t t_3;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_3 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_id_part0[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_id_part0[0].scratch;
+          uint32_t num_bits_3 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_3;
+          if (num_bits_3 == 8) {
+            t_3 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_3 += 8;
+          *scratch |= ((uint64_t)(num_bits_3)) << 56;
+        }
+      }
+      self->private_impl.f_frame_rect_y1 = t_3;
+    }
+    self->private_impl.f_frame_rect_y1 += self->private_impl.f_frame_rect_y0;
+    self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
+    self->private_impl.f_dst_y = self->private_impl.f_frame_rect_y0;
+    if ((self->private_impl.f_call_sequence == 0) &&  ! self->private_impl.f_quirks[4]) {
+      self->private_impl.f_width = wuffs_base__u32__max(self->private_impl.f_width, self->private_impl.f_frame_rect_x1);
+      self->private_impl.f_height = wuffs_base__u32__max(self->private_impl.f_height, self->private_impl.f_frame_rect_y1);
+    }
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_id_part0[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_id_part0[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_id_part1
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_id_part1(
+    wuffs_gif__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_flags = 0;
+  uint8_t v_which_palette = 0;
+  uint32_t v_num_palette_entries = 0;
+  uint32_t v_i = 0;
+  uint32_t v_argb = 0;
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+  uint8_t v_lw = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_id_part1[0];
+  if (coro_susp_point) {
+    v_which_palette = self->private_data.s_decode_id_part1[0].v_which_palette;
+    v_num_palette_entries = self->private_data.s_decode_id_part1[0].v_num_palette_entries;
+    v_i = self->private_data.s_decode_id_part1[0].v_i;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_flags = t_0;
+    }
+    if ((v_flags & 64) != 0) {
+      self->private_impl.f_interlace = 4;
+    } else {
+      self->private_impl.f_interlace = 0;
+    }
+    v_which_palette = 1;
+    if ((v_flags & 128) != 0) {
+      v_num_palette_entries = (((uint32_t)(1)) << (1 + (v_flags & 7)));
+      v_i = 0;
+      while (v_i < v_num_palette_entries) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          uint32_t t_1;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
+            t_1 = ((uint32_t)(wuffs_base__peek_u24be__no_bounds_check(iop_a_src)));
+            iop_a_src += 3;
+          } else {
+            self->private_data.s_decode_id_part1[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_id_part1[0].scratch;
+              uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
+              if (num_bits_1 == 16) {
+                t_1 = ((uint32_t)(*scratch >> 40));
+                break;
+              }
+              num_bits_1 += 8;
+              *scratch |= ((uint64_t)(num_bits_1));
+            }
+          }
+          v_argb = t_1;
+        }
+        v_argb |= 4278190080;
+        self->private_data.f_palettes[1][((4 * v_i) + 0)] = ((uint8_t)(((v_argb >> 0) & 255)));
+        self->private_data.f_palettes[1][((4 * v_i) + 1)] = ((uint8_t)(((v_argb >> 8) & 255)));
+        self->private_data.f_palettes[1][((4 * v_i) + 2)] = ((uint8_t)(((v_argb >> 16) & 255)));
+        self->private_data.f_palettes[1][((4 * v_i) + 3)] = ((uint8_t)(((v_argb >> 24) & 255)));
+        v_i += 1;
+      }
+      while (v_i < 256) {
+        self->private_data.f_palettes[1][((4 * v_i) + 0)] = 0;
+        self->private_data.f_palettes[1][((4 * v_i) + 1)] = 0;
+        self->private_data.f_palettes[1][((4 * v_i) + 2)] = 0;
+        self->private_data.f_palettes[1][((4 * v_i) + 3)] = 255;
+        v_i += 1;
+      }
+    } else if (self->private_impl.f_quirks[6] &&  ! self->private_impl.f_has_global_palette) {
+      status = wuffs_base__make_status(wuffs_gif__error__bad_palette);
+      goto exit;
+    } else if (self->private_impl.f_gc_has_transparent_index) {
+      wuffs_base__slice_u8__copy_from_slice(wuffs_base__make_slice_u8(self->private_data.f_palettes[1], 1024), wuffs_base__make_slice_u8(self->private_data.f_palettes[0], 1024));
+    } else {
+      v_which_palette = 0;
+    }
+    if (self->private_impl.f_gc_has_transparent_index) {
+      self->private_data.f_palettes[1][((4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 0)] = 0;
+      self->private_data.f_palettes[1][((4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 1)] = 0;
+      self->private_data.f_palettes[1][((4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 2)] = 0;
+      self->private_data.f_palettes[1][((4 * ((uint32_t)(self->private_impl.f_gc_transparent_index))) + 3)] = 0;
+    }
+    v_status = wuffs_base__pixel_swizzler__prepare(&self->private_impl.f_swizzler,
+        wuffs_base__pixel_buffer__pixel_format(a_dst),
+        wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024)),
+        wuffs_base__utility__make_pixel_format(2198077448),
+        wuffs_base__make_slice_u8(self->private_data.f_palettes[v_which_palette], 1024),
+        a_blend);
+    if ( ! wuffs_base__status__is_ok(&v_status)) {
+      status = v_status;
+      if (wuffs_base__status__is_error(&status)) {
+        goto exit;
+      } else if (wuffs_base__status__is_suspension(&status)) {
+        status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+        goto exit;
+      }
+      goto ok;
+    }
+    if (self->private_impl.f_previous_lzw_decode_ended_abruptly) {
+      wuffs_base__ignore_status(wuffs_lzw__decoder__initialize(&self->private_data.f_lzw,
+          sizeof (wuffs_lzw__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_2 = *iop_a_src++;
+      v_lw = t_2;
+    }
+    if (v_lw > 8) {
+      status = wuffs_base__make_status(wuffs_gif__error__bad_literal_width);
+      goto exit;
+    }
+    wuffs_lzw__decoder__set_literal_width(&self->private_data.f_lzw, ((uint32_t)(v_lw)));
+    self->private_impl.f_previous_lzw_decode_ended_abruptly = true;
+
+    ok:
+    self->private_impl.p_decode_id_part1[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_id_part1[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_id_part1[0].v_which_palette = v_which_palette;
+  self->private_data.s_decode_id_part1[0].v_num_palette_entries = v_num_palette_entries;
+  self->private_data.s_decode_id_part1[0].v_i = v_i;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.decode_id_part2
+
+static wuffs_base__status
+wuffs_gif__decoder__decode_id_part2(
+    wuffs_gif__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf) {
+  wuffs_base__io_buffer empty_io_buffer = wuffs_base__empty_io_buffer();
+
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint64_t v_block_size = 0;
+  bool v_need_block_size = false;
+  uint32_t v_n_copied = 0;
+  uint64_t v_n_compressed = 0;
+  wuffs_base__io_buffer u_r = wuffs_base__empty_io_buffer();
+  wuffs_base__io_buffer* v_r = &u_r;
+  const uint8_t* iop_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io0_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_v_r WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint64_t v_mark = 0;
+  wuffs_base__status v_lzw_status = wuffs_base__make_status(NULL);
+  wuffs_base__status v_copy_status = wuffs_base__make_status(NULL);
+  wuffs_base__slice_u8 v_uncompressed = {0};
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_id_part2[0];
+  if (coro_susp_point) {
+    v_block_size = self->private_data.s_decode_id_part2[0].v_block_size;
+    v_need_block_size = self->private_data.s_decode_id_part2[0].v_need_block_size;
+    v_lzw_status = self->private_data.s_decode_id_part2[0].v_lzw_status;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    v_need_block_size = true;
+    label__outer__continue:;
+    while (true) {
+      if (v_need_block_size) {
+        v_need_block_size = false;
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t t_0 = *iop_a_src++;
+          v_block_size = t_0;
+        }
+      }
+      if (v_block_size == 0) {
+        goto label__outer__break;
+      }
+      while (((uint64_t)(io2_a_src - iop_a_src)) == 0) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+      }
+      if (self->private_impl.f_compressed_ri == self->private_impl.f_compressed_wi) {
+        self->private_impl.f_compressed_ri = 0;
+        self->private_impl.f_compressed_wi = 0;
+      }
+      while (self->private_impl.f_compressed_wi <= 3841) {
+        v_n_compressed = wuffs_base__u64__min(v_block_size, ((uint64_t)(io2_a_src - iop_a_src)));
+        if (v_n_compressed <= 0) {
+          goto label__0__break;
+        }
+        v_n_copied = wuffs_base__io_reader__limited_copy_u32_to_slice(
+            &iop_a_src, io2_a_src,((uint32_t)((v_n_compressed & 4294967295))), wuffs_base__slice_u8__subslice_i(wuffs_base__make_slice_u8(self->private_data.f_compressed, 4096), self->private_impl.f_compressed_wi));
+        wuffs_base__u64__sat_add_indirect(&self->private_impl.f_compressed_wi, ((uint64_t)(v_n_copied)));
+        wuffs_base__u64__sat_sub_indirect(&v_block_size, ((uint64_t)(v_n_copied)));
+        if (v_block_size > 0) {
+          goto label__0__break;
+        }
+        if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          v_need_block_size = true;
+          goto label__0__break;
+        }
+        v_block_size = ((uint64_t)(wuffs_base__peek_u8be__no_bounds_check(iop_a_src)));
+        iop_a_src += 1;
+      }
+      label__0__break:;
+      label__inner__continue:;
+      while (true) {
+        if ((self->private_impl.f_compressed_ri > self->private_impl.f_compressed_wi) || (self->private_impl.f_compressed_wi > 4096)) {
+          status = wuffs_base__make_status(wuffs_gif__error__internal_error_inconsistent_ri_wi);
+          goto exit;
+        }
+        {
+          wuffs_base__io_buffer* o_0_v_r = v_r;
+          const uint8_t *o_0_iop_v_r = iop_v_r;
+          const uint8_t *o_0_io0_v_r = io0_v_r;
+          const uint8_t *o_0_io1_v_r = io1_v_r;
+          const uint8_t *o_0_io2_v_r = io2_v_r;
+          v_r = wuffs_base__io_reader__set(
+              &u_r,
+              &iop_v_r,
+              &io0_v_r,
+              &io1_v_r,
+              &io2_v_r,
+              wuffs_base__slice_u8__subslice_ij(wuffs_base__make_slice_u8(self->private_data.f_compressed,
+              4096),
+              self->private_impl.f_compressed_ri,
+              self->private_impl.f_compressed_wi),
+              0);
+          v_mark = ((uint64_t)(iop_v_r - io0_v_r));
+          {
+            u_r.meta.ri = ((size_t)(iop_v_r - u_r.data.ptr));
+            wuffs_base__status t_1 = wuffs_lzw__decoder__transform_io(&self->private_data.f_lzw, &empty_io_buffer, v_r, wuffs_base__utility__empty_slice_u8());
+            v_lzw_status = t_1;
+            iop_v_r = u_r.data.ptr + u_r.meta.ri;
+          }
+          wuffs_base__u64__sat_add_indirect(&self->private_impl.f_compressed_ri, wuffs_base__io__count_since(v_mark, ((uint64_t)(iop_v_r - io0_v_r))));
+          v_r = o_0_v_r;
+          iop_v_r = o_0_iop_v_r;
+          io0_v_r = o_0_io0_v_r;
+          io1_v_r = o_0_io1_v_r;
+          io2_v_r = o_0_io2_v_r;
+        }
+        v_uncompressed = wuffs_lzw__decoder__flush(&self->private_data.f_lzw);
+        if (((uint64_t)(v_uncompressed.len)) > 0) {
+          v_copy_status = wuffs_gif__decoder__copy_to_image_buffer(self, a_dst, v_uncompressed);
+          if (wuffs_base__status__is_error(&v_copy_status)) {
+            status = v_copy_status;
+            goto exit;
+          }
+        }
+        if (wuffs_base__status__is_ok(&v_lzw_status)) {
+          self->private_impl.f_previous_lzw_decode_ended_abruptly = false;
+          if (v_need_block_size || (v_block_size > 0)) {
+            self->private_data.s_decode_id_part2[0].scratch = ((uint32_t)(v_block_size));
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+            if (self->private_data.s_decode_id_part2[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+              self->private_data.s_decode_id_part2[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+              iop_a_src = io2_a_src;
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            iop_a_src += self->private_data.s_decode_id_part2[0].scratch;
+            if (a_src) {
+              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+            }
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+            status = wuffs_gif__decoder__skip_blocks(self, a_src);
+            if (a_src) {
+              iop_a_src = a_src->data.ptr + a_src->meta.ri;
+            }
+            if (status.repr) {
+              goto suspend;
+            }
+          }
+          goto label__outer__break;
+        } else if (v_lzw_status.repr == wuffs_base__suspension__short_read) {
+          goto label__outer__continue;
+        } else if (v_lzw_status.repr == wuffs_base__suspension__short_write) {
+          goto label__inner__continue;
+        }
+        status = v_lzw_status;
+        if (wuffs_base__status__is_error(&status)) {
+          goto exit;
+        } else if (wuffs_base__status__is_suspension(&status)) {
+          status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+          goto exit;
+        }
+        goto ok;
+      }
+    }
+    label__outer__break:;
+    self->private_impl.f_compressed_ri = 0;
+    self->private_impl.f_compressed_wi = 0;
+    if ((self->private_impl.f_dst_y < self->private_impl.f_frame_rect_y1) && (self->private_impl.f_frame_rect_x0 != self->private_impl.f_frame_rect_x1) && (self->private_impl.f_frame_rect_y0 != self->private_impl.f_frame_rect_y1)) {
+      status = wuffs_base__make_status(wuffs_base__error__not_enough_data);
+      goto exit;
+    }
+
+    ok:
+    self->private_impl.p_decode_id_part2[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_id_part2[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_id_part2[0].v_block_size = v_block_size;
+  self->private_data.s_decode_id_part2[0].v_need_block_size = v_need_block_size;
+  self->private_data.s_decode_id_part2[0].v_lzw_status = v_lzw_status;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func gif.decoder.copy_to_image_buffer
+
+static wuffs_base__status
+wuffs_gif__decoder__copy_to_image_buffer(
+    wuffs_gif__decoder* self,
+    wuffs_base__pixel_buffer* a_pb,
+    wuffs_base__slice_u8 a_src) {
+  wuffs_base__slice_u8 v_dst = {0};
+  wuffs_base__slice_u8 v_src = {0};
+  uint64_t v_width_in_bytes = 0;
+  uint64_t v_n = 0;
+  uint64_t v_src_ri = 0;
+  wuffs_base__pixel_format v_pixfmt = {0};
+  uint32_t v_bytes_per_pixel = 0;
+  uint32_t v_bits_per_pixel = 0;
+  wuffs_base__table_u8 v_tab = {0};
+  uint64_t v_i = 0;
+  uint64_t v_j = 0;
+  uint32_t v_replicate_y0 = 0;
+  uint32_t v_replicate_y1 = 0;
+  wuffs_base__slice_u8 v_replicate_dst = {0};
+  wuffs_base__slice_u8 v_replicate_src = {0};
+
+  v_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_pb);
+  v_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_pixfmt);
+  if ((v_bits_per_pixel & 7) != 0) {
+    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
+  }
+  v_bytes_per_pixel = (v_bits_per_pixel >> 3);
+  v_width_in_bytes = (((uint64_t)(self->private_impl.f_width)) * ((uint64_t)(v_bytes_per_pixel)));
+  v_tab = wuffs_base__pixel_buffer__plane(a_pb, 0);
+  label__0__continue:;
+  while (v_src_ri < ((uint64_t)(a_src.len))) {
+    v_src = wuffs_base__slice_u8__subslice_i(a_src, v_src_ri);
+    if (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1) {
+      if (self->private_impl.f_quirks[3]) {
+        return wuffs_base__make_status(NULL);
+      }
+      return wuffs_base__make_status(wuffs_base__error__too_much_data);
+    }
+    v_dst = wuffs_base__table_u8__row_u32(v_tab, self->private_impl.f_dst_y);
+    if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
+      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, 0);
+    } else if (v_width_in_bytes < ((uint64_t)(v_dst.len))) {
+      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_width_in_bytes);
+    }
+    v_i = (((uint64_t)(self->private_impl.f_dst_x)) * ((uint64_t)(v_bytes_per_pixel)));
+    if (v_i < ((uint64_t)(v_dst.len))) {
+      v_j = (((uint64_t)(self->private_impl.f_frame_rect_x1)) * ((uint64_t)(v_bytes_per_pixel)));
+      if ((v_i <= v_j) && (v_j <= ((uint64_t)(v_dst.len)))) {
+        v_dst = wuffs_base__slice_u8__subslice_ij(v_dst, v_i, v_j);
+      } else {
+        v_dst = wuffs_base__slice_u8__subslice_i(v_dst, v_i);
+      }
+      v_n = wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024), v_src);
+      wuffs_base__u64__sat_add_indirect(&v_src_ri, v_n);
+      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
+      self->private_impl.f_dirty_max_excl_y = wuffs_base__u32__max(self->private_impl.f_dirty_max_excl_y, wuffs_base__u32__sat_add(self->private_impl.f_dst_y, 1));
+    }
+    if (self->private_impl.f_frame_rect_x1 <= self->private_impl.f_dst_x) {
+      self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
+      if (self->private_impl.f_interlace == 0) {
+        wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_y, 1);
+        goto label__0__continue;
+      }
+      if ((self->private_impl.f_num_decoded_frames_value == 0) &&  ! self->private_impl.f_gc_has_transparent_index && (self->private_impl.f_interlace > 1)) {
+        v_replicate_src = wuffs_base__table_u8__row_u32(v_tab, self->private_impl.f_dst_y);
+        v_replicate_y0 = wuffs_base__u32__sat_add(self->private_impl.f_dst_y, 1);
+        v_replicate_y1 = wuffs_base__u32__sat_add(self->private_impl.f_dst_y, ((uint32_t)(WUFFS_GIF__INTERLACE_COUNT[self->private_impl.f_interlace])));
+        v_replicate_y1 = wuffs_base__u32__min(v_replicate_y1, self->private_impl.f_frame_rect_y1);
+        while (v_replicate_y0 < v_replicate_y1) {
+          v_replicate_dst = wuffs_base__table_u8__row_u32(v_tab, v_replicate_y0);
+          wuffs_base__slice_u8__copy_from_slice(v_replicate_dst, v_replicate_src);
+          v_replicate_y0 += 1;
+        }
+        self->private_impl.f_dirty_max_excl_y = wuffs_base__u32__max(self->private_impl.f_dirty_max_excl_y, v_replicate_y1);
+      }
+      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_y, ((uint32_t)(WUFFS_GIF__INTERLACE_DELTA[self->private_impl.f_interlace])));
+      while ((self->private_impl.f_interlace > 0) && (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1)) {
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+        self->private_impl.f_interlace -= 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+        self->private_impl.f_dst_y = wuffs_base__u32__sat_add(self->private_impl.f_frame_rect_y0, WUFFS_GIF__INTERLACE_START[self->private_impl.f_interlace]);
+      }
+      goto label__0__continue;
+    }
+    if (((uint64_t)(a_src.len)) == v_src_ri) {
+      goto label__0__break;
+    } else if (((uint64_t)(a_src.len)) < v_src_ri) {
+      return wuffs_base__make_status(wuffs_gif__error__internal_error_inconsistent_ri_wi);
+    }
+    v_n = ((uint64_t)((self->private_impl.f_frame_rect_x1 - self->private_impl.f_dst_x)));
+    v_n = wuffs_base__u64__min(v_n, (((uint64_t)(a_src.len)) - v_src_ri));
+    wuffs_base__u64__sat_add_indirect(&v_src_ri, v_n);
+    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
+    if (self->private_impl.f_frame_rect_x1 <= self->private_impl.f_dst_x) {
+      self->private_impl.f_dst_x = self->private_impl.f_frame_rect_x0;
+      wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_y, ((uint32_t)(WUFFS_GIF__INTERLACE_DELTA[self->private_impl.f_interlace])));
+      while ((self->private_impl.f_interlace > 0) && (self->private_impl.f_dst_y >= self->private_impl.f_frame_rect_y1)) {
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+        self->private_impl.f_interlace -= 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+        self->private_impl.f_dst_y = wuffs_base__u32__sat_add(self->private_impl.f_frame_rect_y0, WUFFS_GIF__INTERLACE_START[self->private_impl.f_interlace]);
+      }
+      goto label__0__continue;
+    }
+    if (v_src_ri != ((uint64_t)(a_src.len))) {
+      return wuffs_base__make_status(wuffs_gif__error__internal_error_inconsistent_ri_wi);
+    }
+    goto label__0__break;
+  }
+  label__0__break:;
+  return wuffs_base__make_status(NULL);
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GIF)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GZIP)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_gzip__error__bad_checksum[] = "#gzip: bad checksum";
+const char wuffs_gzip__error__bad_compression_method[] = "#gzip: bad compression method";
+const char wuffs_gzip__error__bad_encoding_flags[] = "#gzip: bad encoding flags";
+const char wuffs_gzip__error__bad_header[] = "#gzip: bad header";
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+// ---------------- VTables
+
+const wuffs_base__io_transformer__func_ptrs
+wuffs_gzip__decoder__func_ptrs_for__wuffs_base__io_transformer = {
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_gzip__decoder__set_quirk_enabled),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__io_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__slice_u8))(&wuffs_gzip__decoder__transform_io),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_gzip__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_gzip__decoder__initialize(
+    wuffs_gzip__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  {
+    wuffs_base__status z = wuffs_crc32__ieee_hasher__initialize(
+        &self->private_data.f_checksum, sizeof(self->private_data.f_checksum), WUFFS_VERSION, options);
+    if (z.repr) {
+      return z;
+    }
+  }
+  {
+    wuffs_base__status z = wuffs_deflate__decoder__initialize(
+        &self->private_data.f_flate, sizeof(self->private_data.f_flate), WUFFS_VERSION, options);
+    if (z.repr) {
+      return z;
+    }
+  }
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__io_transformer.vtable_name =
+      wuffs_base__io_transformer__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__io_transformer.function_pointers =
+      (const void*)(&wuffs_gzip__decoder__func_ptrs_for__wuffs_base__io_transformer);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_gzip__decoder*
+wuffs_gzip__decoder__alloc() {
+  wuffs_gzip__decoder* x =
+      (wuffs_gzip__decoder*)(calloc(sizeof(wuffs_gzip__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_gzip__decoder__initialize(
+      x, sizeof(wuffs_gzip__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_gzip__decoder() {
+  return sizeof(wuffs_gzip__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func gzip.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_gzip__decoder__set_quirk_enabled(
+    wuffs_gzip__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (a_quirk == 1) {
+    self->private_impl.f_ignore_checksum = a_enabled;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func gzip.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_gzip__decoder__workbuf_len(
+    const wuffs_gzip__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- func gzip.decoder.transform_io
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_gzip__decoder__transform_io(
+    wuffs_gzip__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_c = 0;
+  uint8_t v_flags = 0;
+  uint16_t v_xlen = 0;
+  uint64_t v_mark = 0;
+  uint32_t v_checksum_got = 0;
+  uint32_t v_decoded_length_got = 0;
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+  uint32_t v_checksum_want = 0;
+  uint32_t v_decoded_length_want = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_transform_io[0];
+  if (coro_susp_point) {
+    v_flags = self->private_data.s_transform_io[0].v_flags;
+    v_checksum_got = self->private_data.s_transform_io[0].v_checksum_got;
+    v_decoded_length_got = self->private_data.s_transform_io[0].v_decoded_length_got;
+    v_checksum_want = self->private_data.s_transform_io[0].v_checksum_want;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_0 = *iop_a_src++;
+      v_c = t_0;
+    }
+    if (v_c != 31) {
+      status = wuffs_base__make_status(wuffs_gzip__error__bad_header);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_1 = *iop_a_src++;
+      v_c = t_1;
+    }
+    if (v_c != 139) {
+      status = wuffs_base__make_status(wuffs_gzip__error__bad_header);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_2 = *iop_a_src++;
+      v_c = t_2;
+    }
+    if (v_c != 8) {
+      status = wuffs_base__make_status(wuffs_gzip__error__bad_compression_method);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_3 = *iop_a_src++;
+      v_flags = t_3;
+    }
+    self->private_data.s_transform_io[0].scratch = 6;
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+    if (self->private_data.s_transform_io[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+      self->private_data.s_transform_io[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+      iop_a_src = io2_a_src;
+      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+      goto suspend;
+    }
+    iop_a_src += self->private_data.s_transform_io[0].scratch;
+    if ((v_flags & 4) != 0) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+        uint16_t t_4;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_4 = wuffs_base__peek_u16le__no_bounds_check(iop_a_src);
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_transform_io[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
+            uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
+            if (num_bits_4 == 8) {
+              t_4 = ((uint16_t)(*scratch));
+              break;
+            }
+            num_bits_4 += 8;
+            *scratch |= ((uint64_t)(num_bits_4)) << 56;
+          }
+        }
+        v_xlen = t_4;
+      }
+      self->private_data.s_transform_io[0].scratch = ((uint32_t)(v_xlen));
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+      if (self->private_data.s_transform_io[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_transform_io[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_transform_io[0].scratch;
+    }
+    if ((v_flags & 8) != 0) {
+      while (true) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint8_t t_5 = *iop_a_src++;
+          v_c = t_5;
+        }
+        if (v_c == 0) {
+          goto label__0__break;
+        }
+      }
+      label__0__break:;
+    }
+    if ((v_flags & 16) != 0) {
+      while (true) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint8_t t_6 = *iop_a_src++;
+          v_c = t_6;
+        }
+        if (v_c == 0) {
+          goto label__1__break;
+        }
+      }
+      label__1__break:;
+    }
+    if ((v_flags & 2) != 0) {
+      self->private_data.s_transform_io[0].scratch = 2;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
+      if (self->private_data.s_transform_io[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_transform_io[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_transform_io[0].scratch;
+    }
+    if ((v_flags & 224) != 0) {
+      status = wuffs_base__make_status(wuffs_gzip__error__bad_encoding_flags);
+      goto exit;
+    }
+    while (true) {
+      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
+      {
+        if (a_dst) {
+          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        wuffs_base__status t_7 = wuffs_deflate__decoder__transform_io(&self->private_data.f_flate, a_dst, a_src, a_workbuf);
+        v_status = t_7;
+        if (a_dst) {
+          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+        }
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+      }
+      if ( ! self->private_impl.f_ignore_checksum) {
+        v_checksum_got = wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_checksum, wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)), io0_a_dst));
+        v_decoded_length_got += ((uint32_t)((wuffs_base__io__count_since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst))) & 4294967295)));
+      }
+      if (wuffs_base__status__is_ok(&v_status)) {
+        goto label__2__break;
+      }
+      status = v_status;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(12);
+    }
+    label__2__break:;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(13);
+      uint32_t t_8;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_8 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_transform_io[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
+          uint32_t num_bits_8 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_8;
+          if (num_bits_8 == 24) {
+            t_8 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_8 += 8;
+          *scratch |= ((uint64_t)(num_bits_8)) << 56;
+        }
+      }
+      v_checksum_want = t_8;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(15);
+      uint32_t t_9;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_9 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_transform_io[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
+          uint32_t num_bits_9 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_9;
+          if (num_bits_9 == 24) {
+            t_9 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_9 += 8;
+          *scratch |= ((uint64_t)(num_bits_9)) << 56;
+        }
+      }
+      v_decoded_length_want = t_9;
+    }
+    if ( ! self->private_impl.f_ignore_checksum && ((v_checksum_got != v_checksum_want) || (v_decoded_length_got != v_decoded_length_want))) {
+      status = wuffs_base__make_status(wuffs_gzip__error__bad_checksum);
+      goto exit;
+    }
+
+    ok:
+    self->private_impl.p_transform_io[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_transform_io[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+  self->private_data.s_transform_io[0].v_flags = v_flags;
+  self->private_data.s_transform_io[0].v_checksum_got = v_checksum_got;
+  self->private_data.s_transform_io[0].v_decoded_length_got = v_decoded_length_got;
+  self->private_data.s_transform_io[0].v_checksum_want = v_checksum_want;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GZIP)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__JSON)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_json__error__bad_c0_control_code[] = "#json: bad C0 control code";
+const char wuffs_json__error__bad_utf_8[] = "#json: bad UTF-8";
+const char wuffs_json__error__bad_backslash_escape[] = "#json: bad backslash-escape";
+const char wuffs_json__error__bad_input[] = "#json: bad input";
+const char wuffs_json__error__bad_new_line_in_a_string[] = "#json: bad new-line in a string";
+const char wuffs_json__error__bad_quirk_combination[] = "#json: bad quirk combination";
+const char wuffs_json__error__unsupported_number_length[] = "#json: unsupported number length";
+const char wuffs_json__error__unsupported_recursion_depth[] = "#json: unsupported recursion depth";
+const char wuffs_json__error__internal_error_inconsistent_i_o[] = "#json: internal error: inconsistent I/O";
+
+// ---------------- Private Consts
+
+#define WUFFS_JSON__DECODER_NUMBER_LENGTH_MAX_INCL 99
+
+static const uint8_t
+WUFFS_JSON__LUT_BACKSLASHES[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 3, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 162, 0, 0, 0, 0, 5,
+  0, 0, 0, 0, 0, 0, 0, 175,
+  7, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 4,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 220, 0, 0, 0,
+  0, 1, 136, 0, 0, 2, 140, 0,
+  0, 0, 0, 0, 0, 0, 138, 0,
+  0, 0, 141, 0, 137, 0, 6, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+static const uint8_t
+WUFFS_JSON__LUT_QUIRKY_BACKSLASHES_QUIRKS[8] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  0, 1, 3, 4, 5, 6, 7, 10,
+};
+
+static const uint8_t
+WUFFS_JSON__LUT_QUIRKY_BACKSLASHES_CHARS[8] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  0, 7, 27, 10, 63, 39, 11, 0,
+};
+
+static const uint8_t
+WUFFS_JSON__LUT_CHARS[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  128, 129, 130, 131, 132, 133, 134, 135,
+  136, 137, 138, 139, 140, 141, 142, 143,
+  144, 145, 146, 147, 148, 149, 150, 151,
+  152, 153, 154, 155, 156, 157, 158, 159,
+  0, 0, 1, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 2, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  16, 16, 16, 16, 16, 16, 16, 16,
+  16, 16, 16, 16, 16, 16, 16, 16,
+  16, 16, 16, 16, 16, 16, 16, 16,
+  16, 16, 16, 16, 16, 16, 16, 16,
+  16, 16, 16, 16, 16, 16, 16, 16,
+  16, 16, 16, 16, 16, 16, 16, 16,
+  16, 16, 16, 16, 16, 16, 16, 16,
+  16, 16, 16, 16, 16, 16, 16, 16,
+  32, 32, 3, 3, 3, 3, 3, 3,
+  3, 3, 3, 3, 3, 3, 3, 3,
+  3, 3, 3, 3, 3, 3, 3, 3,
+  3, 3, 3, 3, 3, 3, 3, 3,
+  4, 4, 4, 4, 4, 4, 4, 4,
+  4, 4, 4, 4, 4, 4, 4, 4,
+  5, 5, 5, 5, 5, 32, 32, 32,
+  32, 32, 32, 32, 32, 32, 32, 32,
+};
+
+#define WUFFS_JSON__CLASS_WHITESPACE 0
+
+#define WUFFS_JSON__CLASS_STRING 1
+
+#define WUFFS_JSON__CLASS_COMMA 2
+
+#define WUFFS_JSON__CLASS_COLON 3
+
+#define WUFFS_JSON__CLASS_NUMBER 4
+
+#define WUFFS_JSON__CLASS_OPEN_CURLY_BRACE 5
+
+#define WUFFS_JSON__CLASS_CLOSE_CURLY_BRACE 6
+
+#define WUFFS_JSON__CLASS_OPEN_SQUARE_BRACKET 7
+
+#define WUFFS_JSON__CLASS_CLOSE_SQUARE_BRACKET 8
+
+#define WUFFS_JSON__CLASS_FALSE 9
+
+#define WUFFS_JSON__CLASS_TRUE 10
+
+#define WUFFS_JSON__CLASS_NULL_NAN_INF 11
+
+#define WUFFS_JSON__CLASS_COMMENT 12
+
+#define WUFFS_JSON__EXPECT_VALUE 7858
+
+#define WUFFS_JSON__EXPECT_NON_STRING_VALUE 7856
+
+#define WUFFS_JSON__EXPECT_STRING 4098
+
+#define WUFFS_JSON__EXPECT_COMMA 4100
+
+#define WUFFS_JSON__EXPECT_COLON 4104
+
+#define WUFFS_JSON__EXPECT_NUMBER 4112
+
+#define WUFFS_JSON__EXPECT_CLOSE_CURLY_BRACE 4160
+
+#define WUFFS_JSON__EXPECT_CLOSE_SQUARE_BRACKET 4352
+
+static const uint8_t
+WUFFS_JSON__LUT_CLASSES[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 0, 0, 15, 15, 0, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  0, 15, 1, 15, 15, 15, 15, 15,
+  15, 15, 15, 11, 2, 4, 15, 12,
+  4, 4, 4, 4, 4, 4, 4, 4,
+  4, 4, 3, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 11, 15, 15, 15, 15, 11, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 7, 15, 8, 15, 15,
+  15, 15, 15, 15, 15, 15, 9, 15,
+  15, 11, 15, 15, 15, 15, 11, 15,
+  15, 15, 15, 15, 10, 15, 15, 15,
+  15, 15, 15, 5, 15, 6, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+  15, 15, 15, 15, 15, 15, 15, 15,
+};
+
+static const uint8_t
+WUFFS_JSON__LUT_DECIMAL_DIGITS[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  128, 129, 130, 131, 132, 133, 134, 135,
+  136, 137, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+static const uint8_t
+WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  128, 129, 130, 131, 132, 133, 134, 135,
+  136, 137, 0, 0, 0, 0, 0, 0,
+  0, 138, 139, 140, 141, 142, 143, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 138, 139, 140, 141, 142, 143, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+#define WUFFS_JSON__QUIRKS_BASE 1225364480
+
+#define WUFFS_JSON__QUIRKS_COUNT 21
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static uint32_t
+wuffs_json__decoder__decode_number(
+    wuffs_json__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static uint32_t
+wuffs_json__decoder__decode_digits(
+    wuffs_json__decoder* self,
+    wuffs_base__io_buffer* a_src,
+    uint32_t a_n);
+
+static wuffs_base__status
+wuffs_json__decoder__decode_leading(
+    wuffs_json__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_json__decoder__decode_comment(
+    wuffs_json__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_json__decoder__decode_inf_nan(
+    wuffs_json__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_json__decoder__decode_trailer(
+    wuffs_json__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+// ---------------- VTables
+
+const wuffs_base__token_decoder__func_ptrs
+wuffs_json__decoder__func_ptrs_for__wuffs_base__token_decoder = {
+  (wuffs_base__status(*)(void*,
+      wuffs_base__token_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__slice_u8))(&wuffs_json__decoder__decode_tokens),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_json__decoder__set_quirk_enabled),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_json__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_json__decoder__initialize(
+    wuffs_json__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__token_decoder.vtable_name =
+      wuffs_base__token_decoder__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__token_decoder.function_pointers =
+      (const void*)(&wuffs_json__decoder__func_ptrs_for__wuffs_base__token_decoder);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_json__decoder*
+wuffs_json__decoder__alloc() {
+  wuffs_json__decoder* x =
+      (wuffs_json__decoder*)(calloc(sizeof(wuffs_json__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_json__decoder__initialize(
+      x, sizeof(wuffs_json__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_json__decoder() {
+  return sizeof(wuffs_json__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func json.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_json__decoder__set_quirk_enabled(
+    wuffs_json__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (a_quirk >= 1225364480) {
+    a_quirk -= 1225364480;
+    if (a_quirk < 21) {
+      self->private_impl.f_quirks[a_quirk] = a_enabled;
+    }
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func json.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_json__decoder__workbuf_len(
+    const wuffs_json__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__empty_range_ii_u64();
+}
+
+// -------- func json.decoder.decode_tokens
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_json__decoder__decode_tokens(
+    wuffs_json__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_vminor = 0;
+  uint32_t v_number_length = 0;
+  uint32_t v_number_status = 0;
+  uint32_t v_string_length = 0;
+  uint32_t v_whitespace_length = 0;
+  uint32_t v_depth = 0;
+  uint32_t v_stack_byte = 0;
+  uint32_t v_stack_bit = 0;
+  uint32_t v_match = 0;
+  uint32_t v_c4 = 0;
+  uint8_t v_c = 0;
+  uint8_t v_backslash = 0;
+  uint8_t v_char = 0;
+  uint8_t v_class = 0;
+  uint32_t v_multi_byte_utf8 = 0;
+  uint8_t v_backslash_x_ok = 0;
+  uint8_t v_backslash_x_value = 0;
+  uint32_t v_backslash_x_string = 0;
+  uint8_t v_uni4_ok = 0;
+  uint64_t v_uni4_string = 0;
+  uint32_t v_uni4_value = 0;
+  uint32_t v_uni4_high_surrogate = 0;
+  uint8_t v_uni8_ok = 0;
+  uint64_t v_uni8_string = 0;
+  uint32_t v_uni8_value = 0;
+  uint32_t v_expect = 0;
+  uint32_t v_expect_after_value = 0;
+
+  wuffs_base__token* iop_a_dst = NULL;
+  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_tokens[0];
+  if (coro_susp_point) {
+    v_depth = self->private_data.s_decode_tokens[0].v_depth;
+    v_expect = self->private_data.s_decode_tokens[0].v_expect;
+    v_expect_after_value = self->private_data.s_decode_tokens[0].v_expect_after_value;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_end_of_data) {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    }
+    if (self->private_impl.f_quirks[18]) {
+      if (self->private_impl.f_quirks[11] || self->private_impl.f_quirks[12] || self->private_impl.f_quirks[17]) {
+        status = wuffs_base__make_status(wuffs_json__error__bad_quirk_combination);
+        goto exit;
+      }
+    }
+    if (self->private_impl.f_quirks[15] || self->private_impl.f_quirks[16]) {
+      if (a_dst) {
+        a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+      }
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_json__decoder__decode_leading(self, a_dst, a_src);
+      if (a_dst) {
+        iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+      }
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+    }
+    v_expect = 7858;
+    label__outer__continue:;
+    while (true) {
+      while (true) {
+        if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+          goto label__outer__continue;
+        }
+        v_whitespace_length = 0;
+        v_c = 0;
+        v_class = 0;
+        while (true) {
+          if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+            if (v_whitespace_length > 0) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(v_whitespace_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              v_whitespace_length = 0;
+            }
+            if (a_src && a_src->meta.closed) {
+              status = wuffs_base__make_status(wuffs_json__error__bad_input);
+              goto exit;
+            }
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+            v_whitespace_length = 0;
+            goto label__outer__continue;
+          }
+          v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+          v_class = WUFFS_JSON__LUT_CLASSES[v_c];
+          if (v_class != 0) {
+            goto label__ws__break;
+          }
+          iop_a_src += 1;
+          if (v_whitespace_length >= 65534) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(65535)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            v_whitespace_length = 0;
+            goto label__outer__continue;
+          }
+          v_whitespace_length += 1;
+        }
+        label__ws__break:;
+        if (v_whitespace_length > 0) {
+          *iop_a_dst++ = wuffs_base__make_token(
+              (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+              (((uint64_t)(v_whitespace_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+          v_whitespace_length = 0;
+          if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+            goto label__outer__continue;
+          }
+        }
+        if (0 == (v_expect & (((uint32_t)(1)) << v_class))) {
+          status = wuffs_base__make_status(wuffs_json__error__bad_input);
+          goto exit;
+        }
+        if (v_class == 1) {
+          *iop_a_dst++ = wuffs_base__make_token(
+              (((uint64_t)(4194579)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+          iop_a_src += 1;
+          label__string_loop_outer__continue:;
+          while (true) {
+            if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
+              goto label__string_loop_outer__continue;
+            }
+            v_string_length = 0;
+            label__string_loop_inner__continue:;
+            while (true) {
+              if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+                if (v_string_length > 0) {
+                  *iop_a_dst++ = wuffs_base__make_token(
+                      (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                      (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                  v_string_length = 0;
+                }
+                if (a_src && a_src->meta.closed) {
+                  status = wuffs_base__make_status(wuffs_json__error__bad_input);
+                  goto exit;
+                }
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
+                v_string_length = 0;
+                goto label__string_loop_outer__continue;
+              }
+              while (((uint64_t)(io2_a_src - iop_a_src)) > 4) {
+                v_c4 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+                if (0 != (WUFFS_JSON__LUT_CHARS[(255 & (v_c4 >> 0))] |
+                    WUFFS_JSON__LUT_CHARS[(255 & (v_c4 >> 8))] |
+                    WUFFS_JSON__LUT_CHARS[(255 & (v_c4 >> 16))] |
+                    WUFFS_JSON__LUT_CHARS[(255 & (v_c4 >> 24))])) {
+                  goto label__0__break;
+                }
+                iop_a_src += 4;
+                if (v_string_length > 65527) {
+                  *iop_a_dst++ = wuffs_base__make_token(
+                      (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                      (((uint64_t)((v_string_length + 4))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                  v_string_length = 0;
+                  goto label__string_loop_outer__continue;
+                }
+                v_string_length += 4;
+              }
+              label__0__break:;
+              v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+              v_char = WUFFS_JSON__LUT_CHARS[v_c];
+              if (v_char == 0) {
+                iop_a_src += 1;
+                if (v_string_length >= 65531) {
+                  *iop_a_dst++ = wuffs_base__make_token(
+                      (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                      (((uint64_t)(65532)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                  v_string_length = 0;
+                  goto label__string_loop_outer__continue;
+                }
+                v_string_length += 1;
+                goto label__string_loop_inner__continue;
+              } else if (v_char == 1) {
+                if (v_string_length != 0) {
+                  *iop_a_dst++ = wuffs_base__make_token(
+                      (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                      (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                  v_string_length = 0;
+                }
+                goto label__string_loop_outer__break;
+              } else if (v_char == 2) {
+                if (v_string_length > 0) {
+                  *iop_a_dst++ = wuffs_base__make_token(
+                      (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                      (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                  v_string_length = 0;
+                  if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+                    goto label__string_loop_outer__continue;
+                  }
+                }
+                if (((uint64_t)(io2_a_src - iop_a_src)) < 2) {
+                  if (a_src && a_src->meta.closed) {
+                    status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
+                    goto exit;
+                  }
+                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                  WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(6);
+                  v_string_length = 0;
+                  v_char = 0;
+                  goto label__string_loop_outer__continue;
+                }
+                v_c = ((uint8_t)((wuffs_base__peek_u16le__no_bounds_check(iop_a_src) >> 8)));
+                v_backslash = WUFFS_JSON__LUT_BACKSLASHES[v_c];
+                if ((v_backslash & 128) != 0) {
+                  iop_a_src += 2;
+                  *iop_a_dst++ = wuffs_base__make_token(
+                      (((uint64_t)((6291456 | ((uint32_t)((v_backslash & 127)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                      (((uint64_t)(2)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                  goto label__string_loop_outer__continue;
+                } else if (v_backslash != 0) {
+                  if (self->private_impl.f_quirks[WUFFS_JSON__LUT_QUIRKY_BACKSLASHES_QUIRKS[(v_backslash & 7)]]) {
+                    iop_a_src += 2;
+                    *iop_a_dst++ = wuffs_base__make_token(
+                        (((uint64_t)((6291456 | ((uint32_t)(WUFFS_JSON__LUT_QUIRKY_BACKSLASHES_CHARS[(v_backslash & 7)]))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                        (((uint64_t)(2)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                    goto label__string_loop_outer__continue;
+                  }
+                } else if (v_c == 117) {
+                  if (((uint64_t)(io2_a_src - iop_a_src)) < 6) {
+                    if (a_src && a_src->meta.closed) {
+                      status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
+                      goto exit;
+                    }
+                    status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(7);
+                    v_string_length = 0;
+                    v_char = 0;
+                    goto label__string_loop_outer__continue;
+                  }
+                  v_uni4_string = (((uint64_t)(wuffs_base__peek_u48le__no_bounds_check(iop_a_src))) >> 16);
+                  v_uni4_value = 0;
+                  v_uni4_ok = 128;
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 0))];
+                  v_uni4_ok &= v_c;
+                  v_uni4_value |= (((uint32_t)((v_c & 15))) << 12);
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 8))];
+                  v_uni4_ok &= v_c;
+                  v_uni4_value |= (((uint32_t)((v_c & 15))) << 8);
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 16))];
+                  v_uni4_ok &= v_c;
+                  v_uni4_value |= (((uint32_t)((v_c & 15))) << 4);
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 24))];
+                  v_uni4_ok &= v_c;
+                  v_uni4_value |= (((uint32_t)((v_c & 15))) << 0);
+                  if (v_uni4_ok == 0) {
+                  } else if ((v_uni4_value < 55296) || (57343 < v_uni4_value)) {
+                    iop_a_src += 6;
+                    *iop_a_dst++ = wuffs_base__make_token(
+                        (((uint64_t)((6291456 | v_uni4_value))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                        (((uint64_t)(6)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                    goto label__string_loop_outer__continue;
+                  } else if (v_uni4_value >= 56320) {
+                  } else {
+                    if (((uint64_t)(io2_a_src - iop_a_src)) < 12) {
+                      if (a_src && a_src->meta.closed) {
+                        if (self->private_impl.f_quirks[20]) {
+                          iop_a_src += 6;
+                          *iop_a_dst++ = wuffs_base__make_token(
+                              (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                              (((uint64_t)(6)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                          goto label__string_loop_outer__continue;
+                        }
+                        status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
+                        goto exit;
+                      }
+                      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(8);
+                      v_string_length = 0;
+                      v_uni4_value = 0;
+                      v_char = 0;
+                      goto label__string_loop_outer__continue;
+                    }
+                    v_uni4_string = (wuffs_base__peek_u64le__no_bounds_check(iop_a_src + 4) >> 16);
+                    if (((255 & (v_uni4_string >> 0)) != 92) || ((255 & (v_uni4_string >> 8)) != 117)) {
+                      v_uni4_high_surrogate = 0;
+                      v_uni4_value = 0;
+                      v_uni4_ok = 0;
+                    } else {
+                      v_uni4_high_surrogate = (65536 + ((v_uni4_value - 55296) << 10));
+                      v_uni4_value = 0;
+                      v_uni4_ok = 128;
+                      v_uni4_string >>= 16;
+                      v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 0))];
+                      v_uni4_ok &= v_c;
+                      v_uni4_value |= (((uint32_t)((v_c & 15))) << 12);
+                      v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 8))];
+                      v_uni4_ok &= v_c;
+                      v_uni4_value |= (((uint32_t)((v_c & 15))) << 8);
+                      v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 16))];
+                      v_uni4_ok &= v_c;
+                      v_uni4_value |= (((uint32_t)((v_c & 15))) << 4);
+                      v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni4_string >> 24))];
+                      v_uni4_ok &= v_c;
+                      v_uni4_value |= (((uint32_t)((v_c & 15))) << 0);
+                    }
+                    if ((v_uni4_ok != 0) && (56320 <= v_uni4_value) && (v_uni4_value <= 57343)) {
+                      v_uni4_value -= 56320;
+                      iop_a_src += 12;
+                      *iop_a_dst++ = wuffs_base__make_token(
+                          (((uint64_t)((6291456 | v_uni4_high_surrogate | v_uni4_value))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                          (((uint64_t)(12)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                      goto label__string_loop_outer__continue;
+                    }
+                  }
+                  if (self->private_impl.f_quirks[20]) {
+                    if (((uint64_t)(io2_a_src - iop_a_src)) < 6) {
+                      status = wuffs_base__make_status(wuffs_json__error__internal_error_inconsistent_i_o);
+                      goto exit;
+                    }
+                    iop_a_src += 6;
+                    *iop_a_dst++ = wuffs_base__make_token(
+                        (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                        (((uint64_t)(6)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                    goto label__string_loop_outer__continue;
+                  }
+                } else if ((v_c == 85) && self->private_impl.f_quirks[2]) {
+                  if (((uint64_t)(io2_a_src - iop_a_src)) < 10) {
+                    if (a_src && a_src->meta.closed) {
+                      status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
+                      goto exit;
+                    }
+                    status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(9);
+                    v_string_length = 0;
+                    v_char = 0;
+                    goto label__string_loop_outer__continue;
+                  }
+                  v_uni8_string = wuffs_base__peek_u64le__no_bounds_check(iop_a_src + 2);
+                  v_uni8_value = 0;
+                  v_uni8_ok = 128;
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 0))];
+                  v_uni8_ok &= v_c;
+                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 28);
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 8))];
+                  v_uni8_ok &= v_c;
+                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 24);
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 16))];
+                  v_uni8_ok &= v_c;
+                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 20);
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 24))];
+                  v_uni8_ok &= v_c;
+                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 16);
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 32))];
+                  v_uni8_ok &= v_c;
+                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 12);
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 40))];
+                  v_uni8_ok &= v_c;
+                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 8);
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 48))];
+                  v_uni8_ok &= v_c;
+                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 4);
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_uni8_string >> 56))];
+                  v_uni8_ok &= v_c;
+                  v_uni8_value |= (((uint32_t)((v_c & 15))) << 0);
+                  if (v_uni8_ok == 0) {
+                  } else if ((v_uni8_value < 55296) || ((57343 < v_uni8_value) && (v_uni8_value <= 1114111))) {
+                    iop_a_src += 10;
+                    *iop_a_dst++ = wuffs_base__make_token(
+                        (((uint64_t)((6291456 | (v_uni8_value & 2097151)))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                        (((uint64_t)(10)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                    goto label__string_loop_outer__continue;
+                  } else if (self->private_impl.f_quirks[20]) {
+                    iop_a_src += 10;
+                    *iop_a_dst++ = wuffs_base__make_token(
+                        (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                        (((uint64_t)(10)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                    goto label__string_loop_outer__continue;
+                  }
+                } else if ((v_c == 120) && self->private_impl.f_quirks[9]) {
+                  if (((uint64_t)(io2_a_src - iop_a_src)) < 4) {
+                    if (a_src && a_src->meta.closed) {
+                      status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
+                      goto exit;
+                    }
+                    status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
+                    v_string_length = 0;
+                    v_char = 0;
+                    goto label__string_loop_outer__continue;
+                  }
+                  v_backslash_x_string = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+                  v_backslash_x_ok = 128;
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_backslash_x_string >> 16))];
+                  v_backslash_x_ok &= v_c;
+                  v_backslash_x_value = ((uint8_t)(((v_c & 15) << 4)));
+                  v_c = WUFFS_JSON__LUT_HEXADECIMAL_DIGITS[(255 & (v_backslash_x_string >> 24))];
+                  v_backslash_x_ok &= v_c;
+                  v_backslash_x_value = ((uint8_t)((v_backslash_x_value | (v_c & 15))));
+                  if ((v_backslash_x_ok == 0) || ((v_backslash_x_string & 65535) != 30812)) {
+                    status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
+                    goto exit;
+                  }
+                  iop_a_src += 4;
+                  *iop_a_dst++ = wuffs_base__make_token(
+                      (((uint64_t)((6291456 | ((uint32_t)(v_backslash_x_value))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                      (((uint64_t)(4)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                  goto label__string_loop_outer__continue;
+                }
+                status = wuffs_base__make_status(wuffs_json__error__bad_backslash_escape);
+                goto exit;
+              } else if (v_char == 3) {
+                if (((uint64_t)(io2_a_src - iop_a_src)) < 2) {
+                  if (v_string_length > 0) {
+                    *iop_a_dst++ = wuffs_base__make_token(
+                        (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                        (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                    v_string_length = 0;
+                    if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+                      goto label__string_loop_outer__continue;
+                    }
+                  }
+                  if (a_src && a_src->meta.closed) {
+                    if (self->private_impl.f_quirks[20]) {
+                      *iop_a_dst++ = wuffs_base__make_token(
+                          (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                      iop_a_src += 1;
+                      goto label__string_loop_outer__continue;
+                    }
+                    status = wuffs_base__make_status(wuffs_json__error__bad_utf_8);
+                    goto exit;
+                  }
+                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                  WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
+                  v_string_length = 0;
+                  v_char = 0;
+                  goto label__string_loop_outer__continue;
+                }
+                v_multi_byte_utf8 = ((uint32_t)(wuffs_base__peek_u16le__no_bounds_check(iop_a_src)));
+                if ((v_multi_byte_utf8 & 49152) == 32768) {
+                  v_multi_byte_utf8 = ((1984 & ((uint32_t)(v_multi_byte_utf8 << 6))) | (63 & (v_multi_byte_utf8 >> 8)));
+                  iop_a_src += 2;
+                  if (v_string_length >= 65528) {
+                    *iop_a_dst++ = wuffs_base__make_token(
+                        (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                        (((uint64_t)((v_string_length + 2))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                    v_string_length = 0;
+                    goto label__string_loop_outer__continue;
+                  }
+                  v_string_length += 2;
+                  goto label__string_loop_inner__continue;
+                }
+              } else if (v_char == 4) {
+                if (((uint64_t)(io2_a_src - iop_a_src)) < 3) {
+                  if (v_string_length > 0) {
+                    *iop_a_dst++ = wuffs_base__make_token(
+                        (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                        (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                    v_string_length = 0;
+                    if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+                      goto label__string_loop_outer__continue;
+                    }
+                  }
+                  if (a_src && a_src->meta.closed) {
+                    if (self->private_impl.f_quirks[20]) {
+                      *iop_a_dst++ = wuffs_base__make_token(
+                          (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                      iop_a_src += 1;
+                      goto label__string_loop_outer__continue;
+                    }
+                    status = wuffs_base__make_status(wuffs_json__error__bad_utf_8);
+                    goto exit;
+                  }
+                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                  WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(12);
+                  v_string_length = 0;
+                  v_char = 0;
+                  goto label__string_loop_outer__continue;
+                }
+                v_multi_byte_utf8 = ((uint32_t)(wuffs_base__peek_u24le__no_bounds_check(iop_a_src)));
+                if ((v_multi_byte_utf8 & 12632064) == 8421376) {
+                  v_multi_byte_utf8 = ((61440 & ((uint32_t)(v_multi_byte_utf8 << 12))) | (4032 & (v_multi_byte_utf8 >> 2)) | (63 & (v_multi_byte_utf8 >> 16)));
+                  if ((2047 < v_multi_byte_utf8) && ((v_multi_byte_utf8 < 55296) || (57343 < v_multi_byte_utf8))) {
+                    iop_a_src += 3;
+                    if (v_string_length >= 65528) {
+                      *iop_a_dst++ = wuffs_base__make_token(
+                          (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                          (((uint64_t)((v_string_length + 3))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                      v_string_length = 0;
+                      goto label__string_loop_outer__continue;
+                    }
+                    v_string_length += 3;
+                    goto label__string_loop_inner__continue;
+                  }
+                }
+              } else if (v_char == 5) {
+                if (((uint64_t)(io2_a_src - iop_a_src)) < 4) {
+                  if (v_string_length > 0) {
+                    *iop_a_dst++ = wuffs_base__make_token(
+                        (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                        (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                        (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                    v_string_length = 0;
+                    if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+                      goto label__string_loop_outer__continue;
+                    }
+                  }
+                  if (a_src && a_src->meta.closed) {
+                    if (self->private_impl.f_quirks[20]) {
+                      *iop_a_dst++ = wuffs_base__make_token(
+                          (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                      iop_a_src += 1;
+                      goto label__string_loop_outer__continue;
+                    }
+                    status = wuffs_base__make_status(wuffs_json__error__bad_utf_8);
+                    goto exit;
+                  }
+                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                  WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(13);
+                  v_string_length = 0;
+                  v_char = 0;
+                  goto label__string_loop_outer__continue;
+                }
+                v_multi_byte_utf8 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+                if ((v_multi_byte_utf8 & 3233857536) == 2155905024) {
+                  v_multi_byte_utf8 = ((1835008 & ((uint32_t)(v_multi_byte_utf8 << 18))) |
+                      (258048 & ((uint32_t)(v_multi_byte_utf8 << 4))) |
+                      (4032 & (v_multi_byte_utf8 >> 10)) |
+                      (63 & (v_multi_byte_utf8 >> 24)));
+                  if ((65535 < v_multi_byte_utf8) && (v_multi_byte_utf8 <= 1114111)) {
+                    iop_a_src += 4;
+                    if (v_string_length >= 65528) {
+                      *iop_a_dst++ = wuffs_base__make_token(
+                          (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                          (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                          (((uint64_t)((v_string_length + 4))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                      v_string_length = 0;
+                      goto label__string_loop_outer__continue;
+                    }
+                    v_string_length += 4;
+                    goto label__string_loop_inner__continue;
+                  }
+                }
+              }
+              if (v_string_length > 0) {
+                *iop_a_dst++ = wuffs_base__make_token(
+                    (((uint64_t)(4194819)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                    (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                    (((uint64_t)(v_string_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                v_string_length = 0;
+                if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+                  goto label__string_loop_outer__continue;
+                }
+              }
+              if ((v_char & 128) != 0) {
+                if (self->private_impl.f_quirks[0]) {
+                  *iop_a_dst++ = wuffs_base__make_token(
+                      (((uint64_t)((6291456 | ((uint32_t)((v_char & 127)))))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                      (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                  iop_a_src += 1;
+                  goto label__string_loop_outer__continue;
+                }
+                if (v_char == 138) {
+                  status = wuffs_base__make_status(wuffs_json__error__bad_new_line_in_a_string);
+                  goto exit;
+                }
+                status = wuffs_base__make_status(wuffs_json__error__bad_c0_control_code);
+                goto exit;
+              }
+              if (self->private_impl.f_quirks[20]) {
+                *iop_a_dst++ = wuffs_base__make_token(
+                    (((uint64_t)(6356989)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                    (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                    (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+                iop_a_src += 1;
+                goto label__string_loop_outer__continue;
+              }
+              status = wuffs_base__make_status(wuffs_json__error__bad_utf_8);
+              goto exit;
+            }
+          }
+          label__string_loop_outer__break:;
+          label__1__continue:;
+          while (true) {
+            if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+              if (a_src && a_src->meta.closed) {
+                status = wuffs_base__make_status(wuffs_json__error__bad_input);
+                goto exit;
+              }
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(14);
+              goto label__1__continue;
+            }
+            if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(15);
+              goto label__1__continue;
+            }
+            iop_a_src += 1;
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(4194579)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            goto label__1__break;
+          }
+          label__1__break:;
+          if (0 == (v_expect & (((uint32_t)(1)) << 4))) {
+            v_expect = 4104;
+            goto label__outer__continue;
+          }
+          goto label__goto_parsed_a_leaf_value__break;
+        } else if (v_class == 2) {
+          iop_a_src += 1;
+          *iop_a_dst++ = wuffs_base__make_token(
+              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+          if (0 == (v_expect & (((uint32_t)(1)) << 8))) {
+            if (self->private_impl.f_quirks[13]) {
+              v_expect = 4162;
+            } else {
+              v_expect = 4098;
+            }
+          } else {
+            if (self->private_impl.f_quirks[13]) {
+              v_expect = 8114;
+            } else {
+              v_expect = 7858;
+            }
+          }
+          goto label__outer__continue;
+        } else if (v_class == 3) {
+          iop_a_src += 1;
+          *iop_a_dst++ = wuffs_base__make_token(
+              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+          v_expect = 7858;
+          goto label__outer__continue;
+        } else if (v_class == 4) {
+          while (true) {
+            if (a_src) {
+              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+            }
+            v_number_length = wuffs_json__decoder__decode_number(self, a_src);
+            if (a_src) {
+              iop_a_src = a_src->data.ptr + a_src->meta.ri;
+            }
+            v_number_status = (v_number_length >> 8);
+            v_vminor = 10486787;
+            if ((v_number_length & 128) != 0) {
+              v_vminor = 10486785;
+            }
+            v_number_length = (v_number_length & 127);
+            if (v_number_status == 0) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(v_number_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              goto label__2__break;
+            }
+            while (v_number_length > 0) {
+              v_number_length -= 1;
+              if (iop_a_src > io1_a_src) {
+                iop_a_src--;
+              } else {
+                status = wuffs_base__make_status(wuffs_json__error__internal_error_inconsistent_i_o);
+                goto exit;
+              }
+            }
+            if (v_number_status == 1) {
+              if (self->private_impl.f_quirks[14]) {
+                if (a_dst) {
+                  a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+                }
+                if (a_src) {
+                  a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+                }
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
+                status = wuffs_json__decoder__decode_inf_nan(self, a_dst, a_src);
+                if (a_dst) {
+                  iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+                }
+                if (a_src) {
+                  iop_a_src = a_src->data.ptr + a_src->meta.ri;
+                }
+                if (status.repr) {
+                  goto suspend;
+                }
+                goto label__2__break;
+              }
+              status = wuffs_base__make_status(wuffs_json__error__bad_input);
+              goto exit;
+            } else if (v_number_status == 2) {
+              status = wuffs_base__make_status(wuffs_json__error__unsupported_number_length);
+              goto exit;
+            } else {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(17);
+              while (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(18);
+              }
+            }
+          }
+          label__2__break:;
+          goto label__goto_parsed_a_leaf_value__break;
+        } else if (v_class == 5) {
+          v_vminor = 2113553;
+          if (v_depth == 0) {
+          } else if (0 != (v_expect_after_value & (((uint32_t)(1)) << 6))) {
+            v_vminor = 2113601;
+          } else {
+            v_vminor = 2113569;
+          }
+          if (v_depth >= 1024) {
+            status = wuffs_base__make_status(wuffs_json__error__unsupported_recursion_depth);
+            goto exit;
+          }
+          v_stack_byte = (v_depth / 32);
+          v_stack_bit = (v_depth & 31);
+          self->private_data.f_stack[v_stack_byte] |= (((uint32_t)(1)) << v_stack_bit);
+          v_depth += 1;
+          iop_a_src += 1;
+          *iop_a_dst++ = wuffs_base__make_token(
+              (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+          v_expect = 4162;
+          v_expect_after_value = 4164;
+          goto label__outer__continue;
+        } else if (v_class == 6) {
+          iop_a_src += 1;
+          if (v_depth <= 1) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(2101314)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            goto label__outer__break;
+          }
+          v_depth -= 1;
+          v_stack_byte = ((v_depth - 1) / 32);
+          v_stack_bit = ((v_depth - 1) & 31);
+          if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(2105410)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            v_expect = 4356;
+            v_expect_after_value = 4356;
+          } else {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(2113602)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            v_expect = 4164;
+            v_expect_after_value = 4164;
+          }
+          goto label__outer__continue;
+        } else if (v_class == 7) {
+          v_vminor = 2105361;
+          if (v_depth == 0) {
+          } else if (0 != (v_expect_after_value & (((uint32_t)(1)) << 6))) {
+            v_vminor = 2105409;
+          } else {
+            v_vminor = 2105377;
+          }
+          if (v_depth >= 1024) {
+            status = wuffs_base__make_status(wuffs_json__error__unsupported_recursion_depth);
+            goto exit;
+          }
+          v_stack_byte = (v_depth / 32);
+          v_stack_bit = (v_depth & 31);
+          self->private_data.f_stack[v_stack_byte] &= (4294967295 ^ (((uint32_t)(1)) << v_stack_bit));
+          v_depth += 1;
+          iop_a_src += 1;
+          *iop_a_dst++ = wuffs_base__make_token(
+              (((uint64_t)(v_vminor)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+              (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+          v_expect = 8114;
+          v_expect_after_value = 4356;
+          goto label__outer__continue;
+        } else if (v_class == 8) {
+          iop_a_src += 1;
+          if (v_depth <= 1) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(2101282)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            goto label__outer__break;
+          }
+          v_depth -= 1;
+          v_stack_byte = ((v_depth - 1) / 32);
+          v_stack_bit = ((v_depth - 1) & 31);
+          if (0 == (self->private_data.f_stack[v_stack_byte] & (((uint32_t)(1)) << v_stack_bit))) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(2105378)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            v_expect = 4356;
+            v_expect_after_value = 4356;
+          } else {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(2113570)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            v_expect = 4164;
+            v_expect_after_value = 4164;
+          }
+          goto label__outer__continue;
+        } else if (v_class == 9) {
+          v_match = wuffs_base__io_reader__match7(iop_a_src, io2_a_src, a_src,111546413966853);
+          if (v_match == 0) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(8388612)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(5)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            if (((uint64_t)(io2_a_src - iop_a_src)) < 5) {
+              status = wuffs_base__make_status(wuffs_json__error__internal_error_inconsistent_i_o);
+              goto exit;
+            }
+            iop_a_src += 5;
+            goto label__goto_parsed_a_leaf_value__break;
+          } else if (v_match == 1) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(19);
+            goto label__outer__continue;
+          }
+        } else if (v_class == 10) {
+          v_match = wuffs_base__io_reader__match7(iop_a_src, io2_a_src, a_src,435762131972);
+          if (v_match == 0) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(8388616)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(4)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            if (((uint64_t)(io2_a_src - iop_a_src)) < 4) {
+              status = wuffs_base__make_status(wuffs_json__error__internal_error_inconsistent_i_o);
+              goto exit;
+            }
+            iop_a_src += 4;
+            goto label__goto_parsed_a_leaf_value__break;
+          } else if (v_match == 1) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(20);
+            goto label__outer__continue;
+          }
+        } else if (v_class == 11) {
+          v_match = wuffs_base__io_reader__match7(iop_a_src, io2_a_src, a_src,465676103172);
+          if (v_match == 0) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(8388610)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(4)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            if (((uint64_t)(io2_a_src - iop_a_src)) < 4) {
+              status = wuffs_base__make_status(wuffs_json__error__internal_error_inconsistent_i_o);
+              goto exit;
+            }
+            iop_a_src += 4;
+            goto label__goto_parsed_a_leaf_value__break;
+          } else if (v_match == 1) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(21);
+            goto label__outer__continue;
+          }
+          if (self->private_impl.f_quirks[14]) {
+            if (a_dst) {
+              a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+            }
+            if (a_src) {
+              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+            }
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(22);
+            status = wuffs_json__decoder__decode_inf_nan(self, a_dst, a_src);
+            if (a_dst) {
+              iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+            }
+            if (a_src) {
+              iop_a_src = a_src->data.ptr + a_src->meta.ri;
+            }
+            if (status.repr) {
+              goto suspend;
+            }
+            goto label__goto_parsed_a_leaf_value__break;
+          }
+        } else if (v_class == 12) {
+          if (self->private_impl.f_quirks[11] || self->private_impl.f_quirks[12]) {
+            if (a_dst) {
+              a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+            }
+            if (a_src) {
+              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+            }
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(23);
+            status = wuffs_json__decoder__decode_comment(self, a_dst, a_src);
+            if (a_dst) {
+              iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+            }
+            if (a_src) {
+              iop_a_src = a_src->data.ptr + a_src->meta.ri;
+            }
+            if (status.repr) {
+              goto suspend;
+            }
+            if (self->private_impl.f_comment_type > 0) {
+              goto label__outer__continue;
+            }
+          }
+        }
+        status = wuffs_base__make_status(wuffs_json__error__bad_input);
+        goto exit;
+      }
+      label__goto_parsed_a_leaf_value__break:;
+      if (v_depth == 0) {
+        goto label__outer__break;
+      }
+      v_expect = v_expect_after_value;
+    }
+    label__outer__break:;
+    if (self->private_impl.f_quirks[17] || self->private_impl.f_quirks[18]) {
+      if (a_dst) {
+        a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+      }
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(24);
+      status = wuffs_json__decoder__decode_trailer(self, a_dst, a_src);
+      if (a_dst) {
+        iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+      }
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+    }
+    self->private_impl.f_end_of_data = true;
+
+    ok:
+    self->private_impl.p_decode_tokens[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_tokens[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+  self->private_data.s_decode_tokens[0].v_depth = v_depth;
+  self->private_data.s_decode_tokens[0].v_expect = v_expect;
+  self->private_data.s_decode_tokens[0].v_expect_after_value = v_expect_after_value;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func json.decoder.decode_number
+
+static uint32_t
+wuffs_json__decoder__decode_number(
+    wuffs_json__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  uint8_t v_c = 0;
+  uint32_t v_n = 0;
+  uint32_t v_floating_point = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  while (true) {
+    v_n = 0;
+    if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+      if ( ! (a_src && a_src->meta.closed)) {
+        v_n |= 768;
+      }
+      goto label__goto_done__break;
+    }
+    v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+    if (v_c != 45) {
+    } else {
+      v_n += 1;
+      iop_a_src += 1;
+      if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+        if ( ! (a_src && a_src->meta.closed)) {
+          v_n |= 768;
+        }
+        v_n |= 256;
+        goto label__goto_done__break;
+      }
+      v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+    }
+    if (v_c == 48) {
+      v_n += 1;
+      iop_a_src += 1;
+    } else {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      v_n = wuffs_json__decoder__decode_digits(self, a_src, v_n);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (v_n > 99) {
+        goto label__goto_done__break;
+      }
+    }
+    if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+      if ( ! (a_src && a_src->meta.closed)) {
+        v_n |= 768;
+      }
+      goto label__goto_done__break;
+    }
+    v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+    if (v_c != 46) {
+    } else {
+      if (v_n >= 99) {
+        v_n |= 512;
+        goto label__goto_done__break;
+      }
+      v_n += 1;
+      iop_a_src += 1;
+      v_floating_point = 128;
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      v_n = wuffs_json__decoder__decode_digits(self, a_src, v_n);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (v_n > 99) {
+        goto label__goto_done__break;
+      }
+      if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+        if ( ! (a_src && a_src->meta.closed)) {
+          v_n |= 768;
+        }
+        goto label__goto_done__break;
+      }
+      v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+    }
+    if ((v_c != 69) && (v_c != 101)) {
+      goto label__goto_done__break;
+    }
+    if (v_n >= 99) {
+      v_n |= 512;
+      goto label__goto_done__break;
+    }
+    v_n += 1;
+    iop_a_src += 1;
+    v_floating_point = 128;
+    if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+      if ( ! (a_src && a_src->meta.closed)) {
+        v_n |= 768;
+      }
+      v_n |= 256;
+      goto label__goto_done__break;
+    }
+    v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+    if ((v_c != 43) && (v_c != 45)) {
+    } else {
+      if (v_n >= 99) {
+        v_n |= 512;
+        goto label__goto_done__break;
+      }
+      v_n += 1;
+      iop_a_src += 1;
+    }
+    if (a_src) {
+      a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+    }
+    v_n = wuffs_json__decoder__decode_digits(self, a_src, v_n);
+    if (a_src) {
+      iop_a_src = a_src->data.ptr + a_src->meta.ri;
+    }
+    goto label__goto_done__break;
+  }
+  label__goto_done__break:;
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+  return (v_n | v_floating_point);
+}
+
+// -------- func json.decoder.decode_digits
+
+static uint32_t
+wuffs_json__decoder__decode_digits(
+    wuffs_json__decoder* self,
+    wuffs_base__io_buffer* a_src,
+    uint32_t a_n) {
+  uint8_t v_c = 0;
+  uint32_t v_n = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  v_n = a_n;
+  while (true) {
+    if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+      if ( ! (a_src && a_src->meta.closed)) {
+        v_n |= 768;
+      }
+      goto label__0__break;
+    }
+    v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+    if (0 == WUFFS_JSON__LUT_DECIMAL_DIGITS[v_c]) {
+      goto label__0__break;
+    }
+    if (v_n >= 99) {
+      v_n |= 512;
+      goto label__0__break;
+    }
+    v_n += 1;
+    iop_a_src += 1;
+  }
+  label__0__break:;
+  if (v_n == a_n) {
+    v_n |= 256;
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+  return v_n;
+}
+
+// -------- func json.decoder.decode_leading
+
+static wuffs_base__status
+wuffs_json__decoder__decode_leading(
+    wuffs_json__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_c = 0;
+  uint32_t v_u = 0;
+
+  wuffs_base__token* iop_a_dst = NULL;
+  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_leading[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.f_allow_leading_ars = self->private_impl.f_quirks[15];
+    self->private_impl.f_allow_leading_ubom = self->private_impl.f_quirks[16];
+    label__0__continue:;
+    while (self->private_impl.f_allow_leading_ars || self->private_impl.f_allow_leading_ubom) {
+      if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+        goto label__0__continue;
+      }
+      if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+        if (a_src && a_src->meta.closed) {
+          goto label__0__break;
+        }
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+        goto label__0__continue;
+      }
+      v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+      if ((v_c == 30) && self->private_impl.f_allow_leading_ars) {
+        self->private_impl.f_allow_leading_ars = false;
+        iop_a_src += 1;
+        *iop_a_dst++ = wuffs_base__make_token(
+            (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+            (((uint64_t)(1)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+        goto label__0__continue;
+      } else if ((v_c == 239) && self->private_impl.f_allow_leading_ubom) {
+        if (((uint64_t)(io2_a_src - iop_a_src)) < 3) {
+          if (a_src && a_src->meta.closed) {
+            goto label__0__break;
+          }
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+          goto label__0__continue;
+        }
+        v_u = ((uint32_t)(wuffs_base__peek_u24le__no_bounds_check(iop_a_src)));
+        if (v_u == 12565487) {
+          self->private_impl.f_allow_leading_ubom = false;
+          iop_a_src += 3;
+          *iop_a_dst++ = wuffs_base__make_token(
+              (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+              (((uint64_t)(3)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+          goto label__0__continue;
+        }
+      }
+      goto label__0__break;
+    }
+    label__0__break:;
+
+    ok:
+    self->private_impl.p_decode_leading[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_leading[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func json.decoder.decode_comment
+
+static wuffs_base__status
+wuffs_json__decoder__decode_comment(
+    wuffs_json__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_c = 0;
+  uint16_t v_c2 = 0;
+  uint32_t v_length = 0;
+
+  wuffs_base__token* iop_a_dst = NULL;
+  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_comment[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.f_comment_type = 0;
+    label__0__continue:;
+    while ((((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) || (((uint64_t)(io2_a_src - iop_a_src)) <= 1)) {
+      if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+        goto label__0__continue;
+      }
+      if (a_src && a_src->meta.closed) {
+        status = wuffs_base__make_status(NULL);
+        goto ok;
+      }
+      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+    }
+    v_c2 = wuffs_base__peek_u16le__no_bounds_check(iop_a_src);
+    if ((v_c2 == 10799) && self->private_impl.f_quirks[11]) {
+      iop_a_src += 2;
+      v_length = 2;
+      label__comment_block__continue:;
+      while (true) {
+        if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+          v_length = 0;
+          goto label__comment_block__continue;
+        }
+        while (true) {
+          if (((uint64_t)(io2_a_src - iop_a_src)) <= 1) {
+            if (v_length > 0) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(2)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                  (((uint64_t)(v_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            }
+            if (a_src && a_src->meta.closed) {
+              status = wuffs_base__make_status(wuffs_json__error__bad_input);
+              goto exit;
+            }
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
+            v_length = 0;
+            goto label__comment_block__continue;
+          }
+          v_c2 = wuffs_base__peek_u16le__no_bounds_check(iop_a_src);
+          if (v_c2 == 12074) {
+            iop_a_src += 2;
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(2)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)((v_length + 2))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            self->private_impl.f_comment_type = 1;
+            status = wuffs_base__make_status(NULL);
+            goto ok;
+          }
+          iop_a_src += 1;
+          if (v_length >= 65533) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(2)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                (((uint64_t)((v_length + 1))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            v_length = 0;
+            goto label__comment_block__continue;
+          }
+          v_length += 1;
+        }
+      }
+    } else if ((v_c2 == 12079) && self->private_impl.f_quirks[12]) {
+      iop_a_src += 2;
+      v_length = 2;
+      label__comment_line__continue:;
+      while (true) {
+        if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
+          v_length = 0;
+          goto label__comment_line__continue;
+        }
+        while (true) {
+          if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+            if (a_src && a_src->meta.closed) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(4)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(v_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+              self->private_impl.f_comment_type = 2;
+              status = wuffs_base__make_status(NULL);
+              goto ok;
+            } else if (v_length > 0) {
+              *iop_a_dst++ = wuffs_base__make_token(
+                  (((uint64_t)(4)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                  (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                  (((uint64_t)(v_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            }
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(6);
+            v_length = 0;
+            goto label__comment_line__continue;
+          }
+          v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+          if (v_c == 10) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(4)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(v_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            self->private_impl.f_comment_type = 2;
+            status = wuffs_base__make_status(NULL);
+            goto ok;
+          }
+          iop_a_src += 1;
+          if (v_length >= 65533) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(4)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(1)) << WUFFS_BASE__TOKEN__CONTINUED__SHIFT) |
+                (((uint64_t)((v_length + 1))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            v_length = 0;
+            goto label__comment_line__continue;
+          }
+          v_length += 1;
+        }
+      }
+    }
+
+    ok:
+    self->private_impl.p_decode_comment[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_comment[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func json.decoder.decode_inf_nan
+
+static wuffs_base__status
+wuffs_json__decoder__decode_inf_nan(
+    wuffs_json__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_c4 = 0;
+  uint32_t v_neg = 0;
+
+  wuffs_base__token* iop_a_dst = NULL;
+  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_inf_nan[0];
+  if (coro_susp_point) {
+    v_neg = self->private_data.s_decode_inf_nan[0].v_neg;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    label__0__continue:;
+    while (true) {
+      if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+        goto label__0__continue;
+      }
+      if (((uint64_t)(io2_a_src - iop_a_src)) <= 2) {
+        if (a_src && a_src->meta.closed) {
+          status = wuffs_base__make_status(wuffs_json__error__bad_input);
+          goto exit;
+        }
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+        goto label__0__continue;
+      }
+      v_c4 = ((uint32_t)(wuffs_base__peek_u24le__no_bounds_check(iop_a_src)));
+      if ((v_c4 | 2105376) == 6712937) {
+        if (((uint64_t)(io2_a_src - iop_a_src)) > 7) {
+          if ((wuffs_base__peek_u64le__no_bounds_check(iop_a_src) | 2314885530818453536) == 8751735898823356009) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(10485792)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(8)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            iop_a_src += 8;
+            status = wuffs_base__make_status(NULL);
+            goto ok;
+          }
+        } else if ( ! (a_src && a_src->meta.closed)) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+          goto label__0__continue;
+        }
+        *iop_a_dst++ = wuffs_base__make_token(
+            (((uint64_t)(10485792)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+            (((uint64_t)(3)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+        iop_a_src += 3;
+        status = wuffs_base__make_status(NULL);
+        goto ok;
+      } else if ((v_c4 | 2105376) == 7233902) {
+        *iop_a_dst++ = wuffs_base__make_token(
+            (((uint64_t)(10485888)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+            (((uint64_t)(3)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+        iop_a_src += 3;
+        status = wuffs_base__make_status(NULL);
+        goto ok;
+      } else if ((v_c4 & 255) == 43) {
+        v_neg = 0;
+      } else if ((v_c4 & 255) == 45) {
+        v_neg = 1;
+      } else {
+        status = wuffs_base__make_status(wuffs_json__error__bad_input);
+        goto exit;
+      }
+      if (((uint64_t)(io2_a_src - iop_a_src)) <= 3) {
+        if (a_src && a_src->meta.closed) {
+          status = wuffs_base__make_status(wuffs_json__error__bad_input);
+          goto exit;
+        }
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
+        goto label__0__continue;
+      }
+      v_c4 = (wuffs_base__peek_u32le__no_bounds_check(iop_a_src) >> 8);
+      if ((v_c4 | 2105376) == 6712937) {
+        if (((uint64_t)(io2_a_src - iop_a_src)) > 8) {
+          if ((wuffs_base__peek_u64le__no_bounds_check(iop_a_src + 1) | 2314885530818453536) == 8751735898823356009) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)((10485760 | (((uint32_t)(32)) >> v_neg)))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(9)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            iop_a_src += 9;
+            status = wuffs_base__make_status(NULL);
+            goto ok;
+          }
+        } else if ( ! (a_src && a_src->meta.closed)) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
+          goto label__0__continue;
+        }
+        *iop_a_dst++ = wuffs_base__make_token(
+            (((uint64_t)((10485760 | (((uint32_t)(32)) >> v_neg)))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+            (((uint64_t)(4)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+        iop_a_src += 4;
+        status = wuffs_base__make_status(NULL);
+        goto ok;
+      } else if ((v_c4 | 2105376) == 7233902) {
+        *iop_a_dst++ = wuffs_base__make_token(
+            (((uint64_t)((10485760 | (((uint32_t)(128)) >> v_neg)))) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+            (((uint64_t)(4)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+        iop_a_src += 4;
+        status = wuffs_base__make_status(NULL);
+        goto ok;
+      }
+      status = wuffs_base__make_status(wuffs_json__error__bad_input);
+      goto exit;
+    }
+
+    ok:
+    self->private_impl.p_decode_inf_nan[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_inf_nan[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_inf_nan[0].v_neg = v_neg;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func json.decoder.decode_trailer
+
+static wuffs_base__status
+wuffs_json__decoder__decode_trailer(
+    wuffs_json__decoder* self,
+    wuffs_base__token_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_c = 0;
+  uint32_t v_whitespace_length = 0;
+
+  wuffs_base__token* iop_a_dst = NULL;
+  wuffs_base__token* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  wuffs_base__token* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_trailer[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_quirks[18]) {
+      self->private_impl.f_trailer_stop = 10;
+    } else {
+      self->private_impl.f_trailer_stop = 0;
+    }
+    label__outer__continue:;
+    while (true) {
+      if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+        v_whitespace_length = 0;
+        goto label__outer__continue;
+      }
+      while (true) {
+        if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+          if (v_whitespace_length > 0) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(v_whitespace_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            v_whitespace_length = 0;
+          }
+          if (a_src && a_src->meta.closed) {
+            goto label__outer__break;
+          }
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+          v_whitespace_length = 0;
+          goto label__outer__continue;
+        }
+        v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+        if (WUFFS_JSON__LUT_CLASSES[v_c] != 0) {
+          if (v_whitespace_length > 0) {
+            *iop_a_dst++ = wuffs_base__make_token(
+                (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+                (((uint64_t)(v_whitespace_length)) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+            v_whitespace_length = 0;
+          }
+          if (self->private_impl.f_trailer_stop > 0) {
+            status = wuffs_base__make_status(wuffs_json__error__bad_input);
+            goto exit;
+          }
+          if (a_dst) {
+            a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+          }
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          status = wuffs_json__decoder__decode_comment(self, a_dst, a_src);
+          if (a_dst) {
+            iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+          }
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+          if (status.repr) {
+            goto suspend;
+          }
+          v_c = 0;
+          v_whitespace_length = 0;
+          if (self->private_impl.f_comment_type > 0) {
+            goto label__outer__continue;
+          }
+          status = wuffs_base__make_status(NULL);
+          goto ok;
+        }
+        iop_a_src += 1;
+        if ((v_whitespace_length >= 65534) || (v_c == self->private_impl.f_trailer_stop)) {
+          *iop_a_dst++ = wuffs_base__make_token(
+              (((uint64_t)(0)) << WUFFS_BASE__TOKEN__VALUE_MINOR__SHIFT) |
+              (((uint64_t)((v_whitespace_length + 1))) << WUFFS_BASE__TOKEN__LENGTH__SHIFT));
+          v_whitespace_length = 0;
+          if (v_c == self->private_impl.f_trailer_stop) {
+            status = wuffs_base__make_status(NULL);
+            goto ok;
+          }
+          goto label__outer__continue;
+        }
+        v_whitespace_length += 1;
+      }
+    }
+    label__outer__break:;
+
+    ok:
+    self->private_impl.p_decode_trailer[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_trailer[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__JSON)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__NIE)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_nie__error__bad_header[] = "#nie: bad header";
+const char wuffs_nie__error__unsupported_nie_file[] = "#nie: unsupported NIE file";
+const char wuffs_nie__note__internal_note_short_read[] = "@nie: internal note: short read";
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+static wuffs_base__status
+wuffs_nie__decoder__swizzle(
+    wuffs_nie__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src);
+
+// ---------------- VTables
+
+const wuffs_base__image_decoder__func_ptrs
+wuffs_nie__decoder__func_ptrs_for__wuffs_base__image_decoder = {
+  (wuffs_base__status(*)(void*,
+      wuffs_base__pixel_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__pixel_blend,
+      wuffs_base__slice_u8,
+      wuffs_base__decode_frame_options*))(&wuffs_nie__decoder__decode_frame),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__frame_config*,
+      wuffs_base__io_buffer*))(&wuffs_nie__decoder__decode_frame_config),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__image_config*,
+      wuffs_base__io_buffer*))(&wuffs_nie__decoder__decode_image_config),
+  (wuffs_base__rect_ie_u32(*)(const void*))(&wuffs_nie__decoder__frame_dirty_rect),
+  (uint32_t(*)(const void*))(&wuffs_nie__decoder__num_animation_loops),
+  (uint64_t(*)(const void*))(&wuffs_nie__decoder__num_decoded_frame_configs),
+  (uint64_t(*)(const void*))(&wuffs_nie__decoder__num_decoded_frames),
+  (wuffs_base__status(*)(void*,
+      uint64_t,
+      uint64_t))(&wuffs_nie__decoder__restart_frame),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_nie__decoder__set_quirk_enabled),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_nie__decoder__set_report_metadata),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__io_buffer*,
+      wuffs_base__more_information*,
+      wuffs_base__io_buffer*))(&wuffs_nie__decoder__tell_me_more),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_nie__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_nie__decoder__initialize(
+    wuffs_nie__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__image_decoder.vtable_name =
+      wuffs_base__image_decoder__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__image_decoder.function_pointers =
+      (const void*)(&wuffs_nie__decoder__func_ptrs_for__wuffs_base__image_decoder);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_nie__decoder*
+wuffs_nie__decoder__alloc() {
+  wuffs_nie__decoder* x =
+      (wuffs_nie__decoder*)(calloc(sizeof(wuffs_nie__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_nie__decoder__initialize(
+      x, sizeof(wuffs_nie__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_nie__decoder() {
+  return sizeof(wuffs_nie__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func nie.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_nie__decoder__set_quirk_enabled(
+    wuffs_nie__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func nie.decoder.decode_image_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_nie__decoder__decode_image_config(
+    wuffs_nie__decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_a = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence != 0) {
+      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_0 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_image_config[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
+          if (num_bits_0 == 24) {
+            t_0 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0)) << 56;
+        }
+      }
+      v_a = t_0;
+    }
+    if (v_a != 1169146734) {
+      status = wuffs_base__make_status(wuffs_nie__error__bad_header);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint32_t t_1;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_1 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_image_config[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+          uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
+          if (num_bits_1 == 24) {
+            t_1 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_1 += 8;
+          *scratch |= ((uint64_t)(num_bits_1)) << 56;
+        }
+      }
+      v_a = t_1;
+    }
+    if (v_a == 879649535) {
+      self->private_impl.f_pixfmt = 2164295816;
+    } else if (v_a == 946758399) {
+      self->private_impl.f_pixfmt = 2164308923;
+    } else if (v_a == 879780607) {
+      status = wuffs_base__make_status(wuffs_nie__error__unsupported_nie_file);
+      goto exit;
+    } else if (v_a == 946889471) {
+      status = wuffs_base__make_status(wuffs_nie__error__unsupported_nie_file);
+      goto exit;
+    } else {
+      status = wuffs_base__make_status(wuffs_nie__error__bad_header);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      uint32_t t_2;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_2 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_image_config[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+          uint32_t num_bits_2 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_2;
+          if (num_bits_2 == 24) {
+            t_2 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_2 += 8;
+          *scratch |= ((uint64_t)(num_bits_2)) << 56;
+        }
+      }
+      v_a = t_2;
+    }
+    if (v_a >= 2147483648) {
+      status = wuffs_base__make_status(wuffs_nie__error__bad_header);
+      goto exit;
+    }
+    self->private_impl.f_width = v_a;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+      uint32_t t_3;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_3 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_image_config[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+          uint32_t num_bits_3 = ((uint32_t)(*scratch >> 56));
+          *scratch <<= 8;
+          *scratch >>= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_3;
+          if (num_bits_3 == 24) {
+            t_3 = ((uint32_t)(*scratch));
+            break;
+          }
+          num_bits_3 += 8;
+          *scratch |= ((uint64_t)(num_bits_3)) << 56;
+        }
+      }
+      v_a = t_3;
+    }
+    if (v_a >= 2147483648) {
+      status = wuffs_base__make_status(wuffs_nie__error__bad_header);
+      goto exit;
+    }
+    self->private_impl.f_height = v_a;
+    if (a_dst != NULL) {
+      wuffs_base__image_config__set(
+          a_dst,
+          self->private_impl.f_pixfmt,
+          0,
+          self->private_impl.f_width,
+          self->private_impl.f_height,
+          16,
+          false);
+    }
+    self->private_impl.f_call_sequence = 3;
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_image_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_image_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func nie.decoder.decode_frame_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_nie__decoder__decode_frame_config(
+    wuffs_nie__decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 2)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence < 3) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_nie__decoder__decode_image_config(self, NULL, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+    } else if (self->private_impl.f_call_sequence == 3) {
+      if (16 != wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)))) {
+        status = wuffs_base__make_status(wuffs_base__error__bad_restart);
+        goto exit;
+      }
+    } else if (self->private_impl.f_call_sequence == 4) {
+      self->private_impl.f_call_sequence = 255;
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    } else {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    }
+    if (a_dst != NULL) {
+      wuffs_base__frame_config__set(
+          a_dst,
+          wuffs_base__utility__make_rect_ie_u32(
+          0,
+          0,
+          self->private_impl.f_width,
+          self->private_impl.f_height),
+          ((wuffs_base__flicks)(0)),
+          0,
+          16,
+          0,
+          false,
+          false,
+          0);
+    }
+    self->private_impl.f_call_sequence = 4;
+
+    ok:
+    self->private_impl.p_decode_frame_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_frame_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 2 : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func nie.decoder.decode_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_nie__decoder__decode_frame(
+    wuffs_nie__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 3)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence < 4) {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_nie__decoder__decode_frame_config(self, NULL, a_src);
+      if (status.repr) {
+        goto suspend;
+      }
+    } else if (self->private_impl.f_call_sequence == 4) {
+    } else {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    }
+    self->private_impl.f_dst_x = 0;
+    self->private_impl.f_dst_y = 0;
+    v_status = wuffs_base__pixel_swizzler__prepare(&self->private_impl.f_swizzler,
+        wuffs_base__pixel_buffer__pixel_format(a_dst),
+        wuffs_base__pixel_buffer__palette(a_dst),
+        wuffs_base__utility__make_pixel_format(self->private_impl.f_pixfmt),
+        wuffs_base__utility__empty_slice_u8(),
+        a_blend);
+    if ( ! wuffs_base__status__is_ok(&v_status)) {
+      status = v_status;
+      if (wuffs_base__status__is_error(&status)) {
+        goto exit;
+      } else if (wuffs_base__status__is_suspension(&status)) {
+        status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+        goto exit;
+      }
+      goto ok;
+    }
+    while (true) {
+      v_status = wuffs_nie__decoder__swizzle(self, a_dst, a_src);
+      if (wuffs_base__status__is_ok(&v_status)) {
+        goto label__0__break;
+      } else if (v_status.repr != wuffs_nie__note__internal_note_short_read) {
+        status = v_status;
+        if (wuffs_base__status__is_error(&status)) {
+          goto exit;
+        } else if (wuffs_base__status__is_suspension(&status)) {
+          status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+          goto exit;
+        }
+        goto ok;
+      }
+      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+    }
+    label__0__break:;
+    self->private_impl.f_call_sequence = 255;
+
+    ok:
+    self->private_impl.p_decode_frame[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 3 : 0;
+
+  goto exit;
+  exit:
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func nie.decoder.swizzle
+
+static wuffs_base__status
+wuffs_nie__decoder__swizzle(
+    wuffs_nie__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  wuffs_base__pixel_format v_dst_pixfmt = {0};
+  uint32_t v_dst_bits_per_pixel = 0;
+  uint64_t v_dst_bytes_per_pixel = 0;
+  uint64_t v_dst_bytes_per_row = 0;
+  wuffs_base__table_u8 v_tab = {0};
+  wuffs_base__slice_u8 v_dst = {0};
+  uint64_t v_i = 0;
+  uint64_t v_n = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
+  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
+  if ((v_dst_bits_per_pixel & 7) != 0) {
+    status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
+    goto exit;
+  }
+  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
+  v_dst_bytes_per_row = (((uint64_t)(self->private_impl.f_width)) * v_dst_bytes_per_pixel);
+  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
+  label__0__continue:;
+  while (true) {
+    if (self->private_impl.f_dst_x == self->private_impl.f_width) {
+      self->private_impl.f_dst_x = 0;
+      self->private_impl.f_dst_y += 1;
+      if (self->private_impl.f_dst_y >= self->private_impl.f_height) {
+        goto label__0__break;
+      }
+    }
+    v_dst = wuffs_base__table_u8__row_u32(v_tab, self->private_impl.f_dst_y);
+    if (v_dst_bytes_per_row < ((uint64_t)(v_dst.len))) {
+      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row);
+    }
+    v_i = (((uint64_t)(self->private_impl.f_dst_x)) * v_dst_bytes_per_pixel);
+    if (v_i >= ((uint64_t)(v_dst.len))) {
+      goto label__0__continue;
+    }
+    v_n = wuffs_base__pixel_swizzler__swizzle_interleaved_from_reader(
+        &self->private_impl.f_swizzler,
+        wuffs_base__slice_u8__subslice_i(v_dst, v_i),
+        wuffs_base__pixel_buffer__palette(a_dst),
+        &iop_a_src,
+        io2_a_src);
+    if (v_n == 0) {
+      status = wuffs_base__make_status(wuffs_nie__note__internal_note_short_read);
+      goto ok;
+    }
+    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_dst_x, ((uint32_t)((v_n & 4294967295))));
+  }
+  label__0__break:;
+  status = wuffs_base__make_status(NULL);
+  goto ok;
+
+  ok:
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func nie.decoder.frame_dirty_rect
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_nie__decoder__frame_dirty_rect(
+    const wuffs_nie__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+
+  return wuffs_base__utility__make_rect_ie_u32(
+      0,
+      0,
+      self->private_impl.f_width,
+      self->private_impl.f_height);
+}
+
+// -------- func nie.decoder.num_animation_loops
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_nie__decoder__num_animation_loops(
+    const wuffs_nie__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return 0;
+}
+
+// -------- func nie.decoder.num_decoded_frame_configs
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_nie__decoder__num_decoded_frame_configs(
+    const wuffs_nie__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  if (self->private_impl.f_call_sequence > 3) {
+    return 1;
+  }
+  return 0;
+}
+
+// -------- func nie.decoder.num_decoded_frames
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_nie__decoder__num_decoded_frames(
+    const wuffs_nie__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  if (self->private_impl.f_call_sequence > 4) {
+    return 1;
+  }
+  return 0;
+}
+
+// -------- func nie.decoder.restart_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_nie__decoder__restart_frame(
+    wuffs_nie__decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+
+  if (self->private_impl.f_call_sequence < 3) {
+    return wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+  }
+  if ((a_index != 0) || (a_io_position != 16)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  self->private_impl.f_call_sequence = 3;
+  return wuffs_base__make_status(NULL);
+}
+
+// -------- func nie.decoder.set_report_metadata
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_nie__decoder__set_report_metadata(
+    wuffs_nie__decoder* self,
+    uint32_t a_fourcc,
+    bool a_report) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func nie.decoder.tell_me_more
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_nie__decoder__tell_me_more(
+    wuffs_nie__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 4)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  status = wuffs_base__make_status(wuffs_base__error__no_more_information);
+  goto exit;
+
+  goto ok;
+  ok:
+  goto exit;
+  exit:
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func nie.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_nie__decoder__workbuf_len(
+    const wuffs_nie__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(0, 0);
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__NIE)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ZLIB)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_zlib__note__dictionary_required[] = "@zlib: dictionary required";
+const char wuffs_zlib__error__bad_checksum[] = "#zlib: bad checksum";
+const char wuffs_zlib__error__bad_compression_method[] = "#zlib: bad compression method";
+const char wuffs_zlib__error__bad_compression_window_size[] = "#zlib: bad compression window size";
+const char wuffs_zlib__error__bad_parity_check[] = "#zlib: bad parity check";
+const char wuffs_zlib__error__incorrect_dictionary[] = "#zlib: incorrect dictionary";
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+// ---------------- VTables
+
+const wuffs_base__io_transformer__func_ptrs
+wuffs_zlib__decoder__func_ptrs_for__wuffs_base__io_transformer = {
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_zlib__decoder__set_quirk_enabled),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__io_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__slice_u8))(&wuffs_zlib__decoder__transform_io),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_zlib__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_zlib__decoder__initialize(
+    wuffs_zlib__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  {
+    wuffs_base__status z = wuffs_adler32__hasher__initialize(
+        &self->private_data.f_checksum, sizeof(self->private_data.f_checksum), WUFFS_VERSION, options);
+    if (z.repr) {
+      return z;
+    }
+  }
+  {
+    wuffs_base__status z = wuffs_adler32__hasher__initialize(
+        &self->private_data.f_dict_id_hasher, sizeof(self->private_data.f_dict_id_hasher), WUFFS_VERSION, options);
+    if (z.repr) {
+      return z;
+    }
+  }
+  {
+    wuffs_base__status z = wuffs_deflate__decoder__initialize(
+        &self->private_data.f_flate, sizeof(self->private_data.f_flate), WUFFS_VERSION, options);
+    if (z.repr) {
+      return z;
+    }
+  }
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__io_transformer.vtable_name =
+      wuffs_base__io_transformer__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__io_transformer.function_pointers =
+      (const void*)(&wuffs_zlib__decoder__func_ptrs_for__wuffs_base__io_transformer);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_zlib__decoder*
+wuffs_zlib__decoder__alloc() {
+  wuffs_zlib__decoder* x =
+      (wuffs_zlib__decoder*)(calloc(sizeof(wuffs_zlib__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_zlib__decoder__initialize(
+      x, sizeof(wuffs_zlib__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_zlib__decoder() {
+  return sizeof(wuffs_zlib__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func zlib.decoder.dictionary_id
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_zlib__decoder__dictionary_id(
+    const wuffs_zlib__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return self->private_impl.f_dict_id_want;
+}
+
+// -------- func zlib.decoder.add_dictionary
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_zlib__decoder__add_dictionary(
+    wuffs_zlib__decoder* self,
+    wuffs_base__slice_u8 a_dict) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (self->private_impl.f_header_complete) {
+    self->private_impl.f_bad_call_sequence = true;
+  } else {
+    self->private_impl.f_dict_id_got = wuffs_adler32__hasher__update_u32(&self->private_data.f_dict_id_hasher, a_dict);
+    wuffs_deflate__decoder__add_history(&self->private_data.f_flate, a_dict);
+  }
+  self->private_impl.f_got_dictionary = true;
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func zlib.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_zlib__decoder__set_quirk_enabled(
+    wuffs_zlib__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (a_quirk == 1) {
+    self->private_impl.f_ignore_checksum = a_enabled;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func zlib.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_zlib__decoder__workbuf_len(
+    const wuffs_zlib__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(1, 1);
+}
+
+// -------- func zlib.decoder.transform_io
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_zlib__decoder__transform_io(
+    wuffs_zlib__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint16_t v_x = 0;
+  uint32_t v_checksum_got = 0;
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+  uint32_t v_checksum_want = 0;
+  uint64_t v_mark = 0;
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_transform_io[0];
+  if (coro_susp_point) {
+    v_checksum_got = self->private_data.s_transform_io[0].v_checksum_got;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_bad_call_sequence) {
+      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+      goto exit;
+    } else if ( ! self->private_impl.f_want_dictionary) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        uint16_t t_0;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_0 = wuffs_base__peek_u16be__no_bounds_check(iop_a_src);
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_transform_io[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
+            uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+            *scratch >>= 8;
+            *scratch <<= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+            if (num_bits_0 == 8) {
+              t_0 = ((uint16_t)(*scratch >> 48));
+              break;
+            }
+            num_bits_0 += 8;
+            *scratch |= ((uint64_t)(num_bits_0));
+          }
+        }
+        v_x = t_0;
+      }
+      if (((v_x >> 8) & 15) != 8) {
+        status = wuffs_base__make_status(wuffs_zlib__error__bad_compression_method);
+        goto exit;
+      }
+      if ((v_x >> 12) > 7) {
+        status = wuffs_base__make_status(wuffs_zlib__error__bad_compression_window_size);
+        goto exit;
+      }
+      if ((v_x % 31) != 0) {
+        status = wuffs_base__make_status(wuffs_zlib__error__bad_parity_check);
+        goto exit;
+      }
+      self->private_impl.f_want_dictionary = ((v_x & 32) != 0);
+      if (self->private_impl.f_want_dictionary) {
+        self->private_impl.f_dict_id_got = 1;
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          uint32_t t_1;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_1 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_transform_io[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
+              uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
+              if (num_bits_1 == 24) {
+                t_1 = ((uint32_t)(*scratch >> 32));
+                break;
+              }
+              num_bits_1 += 8;
+              *scratch |= ((uint64_t)(num_bits_1));
+            }
+          }
+          self->private_impl.f_dict_id_want = t_1;
+        }
+        status = wuffs_base__make_status(wuffs_zlib__note__dictionary_required);
+        goto ok;
+      } else if (self->private_impl.f_got_dictionary) {
+        status = wuffs_base__make_status(wuffs_zlib__error__incorrect_dictionary);
+        goto exit;
+      }
+    } else if (self->private_impl.f_dict_id_got != self->private_impl.f_dict_id_want) {
+      if (self->private_impl.f_got_dictionary) {
+        status = wuffs_base__make_status(wuffs_zlib__error__incorrect_dictionary);
+        goto exit;
+      }
+      status = wuffs_base__make_status(wuffs_zlib__note__dictionary_required);
+      goto ok;
+    }
+    self->private_impl.f_header_complete = true;
+    while (true) {
+      v_mark = ((uint64_t)(iop_a_dst - io0_a_dst));
+      {
+        if (a_dst) {
+          a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        wuffs_base__status t_2 = wuffs_deflate__decoder__transform_io(&self->private_data.f_flate, a_dst, a_src, a_workbuf);
+        v_status = t_2;
+        if (a_dst) {
+          iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+        }
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+      }
+      if ( ! self->private_impl.f_ignore_checksum) {
+        v_checksum_got = wuffs_adler32__hasher__update_u32(&self->private_data.f_checksum, wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_dst - io0_a_dst)), io0_a_dst));
+      }
+      if (wuffs_base__status__is_ok(&v_status)) {
+        goto label__0__break;
+      }
+      status = v_status;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
+    }
+    label__0__break:;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+      uint32_t t_3;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_3 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_transform_io[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_transform_io[0].scratch;
+          uint32_t num_bits_3 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
+          if (num_bits_3 == 24) {
+            t_3 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_3 += 8;
+          *scratch |= ((uint64_t)(num_bits_3));
+        }
+      }
+      v_checksum_want = t_3;
+    }
+    if ( ! self->private_impl.f_ignore_checksum && (v_checksum_got != v_checksum_want)) {
+      status = wuffs_base__make_status(wuffs_zlib__error__bad_checksum);
+      goto exit;
+    }
+
+    ok:
+    self->private_impl.p_transform_io[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_transform_io[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+  self->private_data.s_transform_io[0].v_checksum_got = v_checksum_got;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__ZLIB)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__PNG)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_png__error__bad_animation_sequence_number[] = "#png: bad animation sequence number";
+const char wuffs_png__error__bad_checksum[] = "#png: bad checksum";
+const char wuffs_png__error__bad_chunk[] = "#png: bad chunk";
+const char wuffs_png__error__bad_filter[] = "#png: bad filter";
+const char wuffs_png__error__bad_header[] = "#png: bad header";
+const char wuffs_png__error__bad_text_chunk_not_latin_1[] = "#png: bad text chunk (not Latin-1)";
+const char wuffs_png__error__missing_palette[] = "#png: missing palette";
+const char wuffs_png__error__unsupported_png_compression_method[] = "#png: unsupported PNG compression method";
+const char wuffs_png__error__unsupported_png_file[] = "#png: unsupported PNG file";
+const char wuffs_png__error__internal_error_inconsistent_i_o[] = "#png: internal error: inconsistent I/O";
+const char wuffs_png__error__internal_error_inconsistent_chunk_type[] = "#png: internal error: inconsistent chunk type";
+const char wuffs_png__error__internal_error_inconsistent_frame_bounds[] = "#png: internal error: inconsistent frame bounds";
+const char wuffs_png__error__internal_error_inconsistent_workbuf_length[] = "#png: internal error: inconsistent workbuf length";
+const char wuffs_png__error__internal_error_zlib_decoder_did_not_exhaust_its_input[] = "#png: internal error: zlib decoder did not exhaust its input";
+
+// ---------------- Private Consts
+
+#define WUFFS_PNG__ANCILLARY_BIT 32
+
+static const uint8_t
+WUFFS_PNG__INTERLACING[8][6] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  {
+    0, 0, 0, 0, 0, 0,
+  }, {
+    3, 7, 0, 3, 7, 0,
+  }, {
+    3, 3, 4, 3, 7, 0,
+  }, {
+    2, 3, 0, 3, 3, 4,
+  }, {
+    2, 1, 2, 2, 3, 0,
+  }, {
+    1, 1, 0, 2, 1, 2,
+  }, {
+    1, 0, 1, 1, 1, 0,
+  }, {
+    0, 0, 0, 1, 0, 1,
+  },
+};
+
+static const uint8_t
+WUFFS_PNG__LOW_BIT_DEPTH_MULTIPLIERS[8] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  0, 255, 85, 0, 17, 0, 0, 0,
+};
+
+static const uint8_t
+WUFFS_PNG__LOW_BIT_DEPTH_NUM_PACKS[8] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  0, 8, 4, 0, 2, 0, 0, 0,
+};
+
+static const uint8_t
+WUFFS_PNG__NUM_CHANNELS[8] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  1, 0, 3, 1, 2, 0, 4, 0,
+};
+
+static const uint16_t
+WUFFS_PNG__LATIN_1[256] WUFFS_BASE__POTENTIALLY_UNUSED = {
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  32, 33, 34, 35, 36, 37, 38, 39,
+  40, 41, 42, 43, 44, 45, 46, 47,
+  48, 49, 50, 51, 52, 53, 54, 55,
+  56, 57, 58, 59, 60, 61, 62, 63,
+  64, 65, 66, 67, 68, 69, 70, 71,
+  72, 73, 74, 75, 76, 77, 78, 79,
+  80, 81, 82, 83, 84, 85, 86, 87,
+  88, 89, 90, 91, 92, 93, 94, 95,
+  96, 97, 98, 99, 100, 101, 102, 103,
+  104, 105, 106, 107, 108, 109, 110, 111,
+  112, 113, 114, 115, 116, 117, 118, 119,
+  120, 121, 122, 123, 124, 125, 126, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 41410, 41666, 41922, 42178, 42434, 42690, 42946,
+  43202, 43458, 43714, 43970, 44226, 44482, 44738, 44994,
+  45250, 45506, 45762, 46018, 46274, 46530, 46786, 47042,
+  47298, 47554, 47810, 48066, 48322, 48578, 48834, 49090,
+  32963, 33219, 33475, 33731, 33987, 34243, 34499, 34755,
+  35011, 35267, 35523, 35779, 36035, 36291, 36547, 36803,
+  37059, 37315, 37571, 37827, 38083, 38339, 38595, 38851,
+  39107, 39363, 39619, 39875, 40131, 40387, 40643, 40899,
+  41155, 41411, 41667, 41923, 42179, 42435, 42691, 42947,
+  43203, 43459, 43715, 43971, 44227, 44483, 44739, 44995,
+  45251, 45507, 45763, 46019, 46275, 46531, 46787, 47043,
+  47299, 47555, 47811, 48067, 48323, 48579, 48835, 49091,
+};
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1_distance_4_arm_neon(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3_distance_4_arm_neon(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_3_arm_neon(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_4_arm_neon(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1__choosy_default(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1_distance_3_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1_distance_4_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_2(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3__choosy_default(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3_distance_3_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3_distance_4_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4__choosy_default(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_3_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_4_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1_distance_4_x86_sse42(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3_distance_4_x86_sse42(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_3_x86_sse42(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_4_x86_sse42(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev);
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+
+static wuffs_base__status
+wuffs_png__decoder__decode_ihdr(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__assign_filter_distance(
+    wuffs_png__decoder* self);
+
+static uint64_t
+wuffs_png__decoder__calculate_bytes_per_row(
+    const wuffs_png__decoder* self,
+    uint32_t a_width);
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__choose_filter_implementations(
+    wuffs_png__decoder* self);
+
+static wuffs_base__status
+wuffs_png__decoder__decode_other_chunk(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_png__decoder__decode_actl(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_png__decoder__decode_chrm(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_png__decoder__decode_fctl(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_png__decoder__decode_gama(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_png__decoder__decode_iccp(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_png__decoder__decode_plte(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_png__decoder__decode_srgb(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_png__decoder__decode_trns(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_png__decoder__skip_frame(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src);
+
+static wuffs_base__status
+wuffs_png__decoder__decode_pass(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf);
+
+static wuffs_base__status
+wuffs_png__decoder__filter_and_swizzle(
+    wuffs_png__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__slice_u8 a_workbuf);
+
+static wuffs_base__status
+wuffs_png__decoder__filter_and_swizzle__choosy_default(
+    wuffs_png__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__slice_u8 a_workbuf);
+
+static wuffs_base__status
+wuffs_png__decoder__filter_and_swizzle_tricky(
+    wuffs_png__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__slice_u8 a_workbuf);
+
+// ---------------- VTables
+
+const wuffs_base__image_decoder__func_ptrs
+wuffs_png__decoder__func_ptrs_for__wuffs_base__image_decoder = {
+  (wuffs_base__status(*)(void*,
+      wuffs_base__pixel_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__pixel_blend,
+      wuffs_base__slice_u8,
+      wuffs_base__decode_frame_options*))(&wuffs_png__decoder__decode_frame),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__frame_config*,
+      wuffs_base__io_buffer*))(&wuffs_png__decoder__decode_frame_config),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__image_config*,
+      wuffs_base__io_buffer*))(&wuffs_png__decoder__decode_image_config),
+  (wuffs_base__rect_ie_u32(*)(const void*))(&wuffs_png__decoder__frame_dirty_rect),
+  (uint32_t(*)(const void*))(&wuffs_png__decoder__num_animation_loops),
+  (uint64_t(*)(const void*))(&wuffs_png__decoder__num_decoded_frame_configs),
+  (uint64_t(*)(const void*))(&wuffs_png__decoder__num_decoded_frames),
+  (wuffs_base__status(*)(void*,
+      uint64_t,
+      uint64_t))(&wuffs_png__decoder__restart_frame),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_png__decoder__set_quirk_enabled),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_png__decoder__set_report_metadata),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__io_buffer*,
+      wuffs_base__more_information*,
+      wuffs_base__io_buffer*))(&wuffs_png__decoder__tell_me_more),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_png__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_png__decoder__initialize(
+    wuffs_png__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.choosy_filter_1 = &wuffs_png__decoder__filter_1__choosy_default;
+  self->private_impl.choosy_filter_3 = &wuffs_png__decoder__filter_3__choosy_default;
+  self->private_impl.choosy_filter_4 = &wuffs_png__decoder__filter_4__choosy_default;
+  self->private_impl.choosy_filter_and_swizzle = &wuffs_png__decoder__filter_and_swizzle__choosy_default;
+
+  {
+    wuffs_base__status z = wuffs_crc32__ieee_hasher__initialize(
+        &self->private_data.f_crc32, sizeof(self->private_data.f_crc32), WUFFS_VERSION, options);
+    if (z.repr) {
+      return z;
+    }
+  }
+  {
+    wuffs_base__status z = wuffs_zlib__decoder__initialize(
+        &self->private_data.f_zlib, sizeof(self->private_data.f_zlib), WUFFS_VERSION, options);
+    if (z.repr) {
+      return z;
+    }
+  }
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__image_decoder.vtable_name =
+      wuffs_base__image_decoder__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__image_decoder.function_pointers =
+      (const void*)(&wuffs_png__decoder__func_ptrs_for__wuffs_base__image_decoder);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_png__decoder*
+wuffs_png__decoder__alloc() {
+  wuffs_png__decoder* x =
+      (wuffs_png__decoder*)(calloc(sizeof(wuffs_png__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_png__decoder__initialize(
+      x, sizeof(wuffs_png__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_png__decoder() {
+  return sizeof(wuffs_png__decoder);
+}
+
+// ---------------- Function Implementations
+
+// ‼ WUFFS MULTI-FILE SECTION +arm_neon
+// -------- func png.decoder.filter_1_distance_4_arm_neon
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1_distance_4_arm_neon(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr) {
+  wuffs_base__slice_u8 v_curr = {0};
+  uint8x8_t v_fa = {0};
+  uint8x8_t v_fx = {0};
+
+  {
+    wuffs_base__slice_u8 i_slice_curr = a_curr;
+    v_curr.ptr = i_slice_curr.ptr;
+    v_curr.len = 4;
+    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
+    while (v_curr.ptr < i_end0_curr) {
+      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_fx = vadd_u8(v_fx, v_fa);
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+      v_fa = v_fx;
+      v_curr.ptr += 4;
+      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_fx = vadd_u8(v_fx, v_fa);
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+      v_fa = v_fx;
+      v_curr.ptr += 4;
+    }
+    v_curr.len = 4;
+    uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+    while (v_curr.ptr < i_end1_curr) {
+      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_fx = vadd_u8(v_fx, v_fa);
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+      v_fa = v_fx;
+      v_curr.ptr += 4;
+    }
+    v_curr.len = 0;
+  }
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+// ‼ WUFFS MULTI-FILE SECTION -arm_neon
+
+// ‼ WUFFS MULTI-FILE SECTION +arm_neon
+// -------- func png.decoder.filter_3_distance_4_arm_neon
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3_distance_4_arm_neon(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  wuffs_base__slice_u8 v_curr = {0};
+  wuffs_base__slice_u8 v_prev = {0};
+  uint8x8_t v_fa = {0};
+  uint8x8_t v_fb = {0};
+  uint8x8_t v_fx = {0};
+
+  if (((uint64_t)(a_prev.len)) == 0) {
+    {
+      wuffs_base__slice_u8 i_slice_curr = a_curr;
+      v_curr.ptr = i_slice_curr.ptr;
+      v_curr.len = 4;
+      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
+      while (v_curr.ptr < i_end0_curr) {
+        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+        v_fa = v_fx;
+        v_curr.ptr += 4;
+        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+        v_fa = v_fx;
+        v_curr.ptr += 4;
+      }
+      v_curr.len = 4;
+      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+      while (v_curr.ptr < i_end1_curr) {
+        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+        v_fa = v_fx;
+        v_curr.ptr += 4;
+      }
+      v_curr.len = 0;
+    }
+  } else {
+    {
+      wuffs_base__slice_u8 i_slice_curr = a_curr;
+      v_curr.ptr = i_slice_curr.ptr;
+      wuffs_base__slice_u8 i_slice_prev = a_prev;
+      v_prev.ptr = i_slice_prev.ptr;
+      i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
+      v_curr.len = 4;
+      v_prev.len = 4;
+      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
+      while (v_curr.ptr < i_end0_curr) {
+        v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+        v_fa = v_fx;
+        v_curr.ptr += 4;
+        v_prev.ptr += 4;
+        v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+        v_fa = v_fx;
+        v_curr.ptr += 4;
+        v_prev.ptr += 4;
+      }
+      v_curr.len = 4;
+      v_prev.len = 4;
+      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+      while (v_curr.ptr < i_end1_curr) {
+        v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+        v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_fx = vadd_u8(v_fx, vhadd_u8(v_fa, v_fb));
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+        v_fa = v_fx;
+        v_curr.ptr += 4;
+        v_prev.ptr += 4;
+      }
+      v_curr.len = 0;
+      v_prev.len = 0;
+    }
+  }
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+// ‼ WUFFS MULTI-FILE SECTION -arm_neon
+
+// ‼ WUFFS MULTI-FILE SECTION +arm_neon
+// -------- func png.decoder.filter_4_distance_3_arm_neon
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_3_arm_neon(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  wuffs_base__slice_u8 v_curr = {0};
+  wuffs_base__slice_u8 v_prev = {0};
+  uint8x8_t v_fa = {0};
+  uint8x8_t v_fb = {0};
+  uint8x8_t v_fc = {0};
+  uint8x8_t v_fx = {0};
+  uint16x8_t v_fafb = {0};
+  uint16x8_t v_fcfc = {0};
+  uint16x8_t v_pa = {0};
+  uint16x8_t v_pb = {0};
+  uint16x8_t v_pc = {0};
+  uint16x8_t v_cmpab = {0};
+  uint16x8_t v_cmpac = {0};
+  uint8x8_t v_picka = {0};
+  uint8x8_t v_pickb = {0};
+
+  {
+    wuffs_base__slice_u8 i_slice_curr = a_curr;
+    v_curr.ptr = i_slice_curr.ptr;
+    wuffs_base__slice_u8 i_slice_prev = a_prev;
+    v_prev.ptr = i_slice_prev.ptr;
+    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
+    v_curr.len = 4;
+    v_prev.len = 4;
+    uint8_t* i_end0_curr = v_curr.ptr + wuffs_base__iterate_total_advance((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)), 7, 6);
+    while (v_curr.ptr < i_end0_curr) {
+      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_fafb = vaddl_u8(v_fa, v_fb);
+      v_fcfc = vaddl_u8(v_fc, v_fc);
+      v_pa = vabdl_u8(v_fb, v_fc);
+      v_pb = vabdl_u8(v_fa, v_fc);
+      v_pc = vabdq_u16(v_fafb, v_fcfc);
+      v_cmpab = vcleq_u16(v_pa, v_pb);
+      v_cmpac = vcleq_u16(v_pa, v_pc);
+      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
+      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
+      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
+      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+      v_fc = v_fb;
+      v_fa = v_fx;
+      v_curr.ptr += 3;
+      v_prev.ptr += 3;
+      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_fafb = vaddl_u8(v_fa, v_fb);
+      v_fcfc = vaddl_u8(v_fc, v_fc);
+      v_pa = vabdl_u8(v_fb, v_fc);
+      v_pb = vabdl_u8(v_fa, v_fc);
+      v_pc = vabdq_u16(v_fafb, v_fcfc);
+      v_cmpab = vcleq_u16(v_pa, v_pb);
+      v_cmpac = vcleq_u16(v_pa, v_pc);
+      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
+      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
+      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
+      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+      v_fc = v_fb;
+      v_fa = v_fx;
+      v_curr.ptr += 3;
+      v_prev.ptr += 3;
+    }
+    v_curr.len = 4;
+    v_prev.len = 4;
+    uint8_t* i_end1_curr = v_curr.ptr + wuffs_base__iterate_total_advance((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)), 4, 3);
+    while (v_curr.ptr < i_end1_curr) {
+      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_fafb = vaddl_u8(v_fa, v_fb);
+      v_fcfc = vaddl_u8(v_fc, v_fc);
+      v_pa = vabdl_u8(v_fb, v_fc);
+      v_pb = vabdl_u8(v_fa, v_fc);
+      v_pc = vabdq_u16(v_fafb, v_fcfc);
+      v_cmpab = vcleq_u16(v_pa, v_pb);
+      v_cmpac = vcleq_u16(v_pa, v_pc);
+      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
+      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
+      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
+      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+      v_fc = v_fb;
+      v_fa = v_fx;
+      v_curr.ptr += 3;
+      v_prev.ptr += 3;
+    }
+    v_curr.len = 3;
+    v_prev.len = 3;
+    uint8_t* i_end2_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
+    while (v_curr.ptr < i_end2_curr) {
+      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u24le__no_bounds_check(v_prev.ptr)));
+      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u24le__no_bounds_check(v_curr.ptr)));
+      v_fafb = vaddl_u8(v_fa, v_fb);
+      v_fcfc = vaddl_u8(v_fc, v_fc);
+      v_pa = vabdl_u8(v_fb, v_fc);
+      v_pb = vabdl_u8(v_fa, v_fc);
+      v_pc = vabdq_u16(v_fafb, v_fcfc);
+      v_cmpab = vcleq_u16(v_pa, v_pb);
+      v_cmpac = vcleq_u16(v_pa, v_pc);
+      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
+      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
+      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
+      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+      v_curr.ptr += 3;
+      v_prev.ptr += 3;
+    }
+    v_curr.len = 0;
+    v_prev.len = 0;
+  }
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+// ‼ WUFFS MULTI-FILE SECTION -arm_neon
+
+// ‼ WUFFS MULTI-FILE SECTION +arm_neon
+// -------- func png.decoder.filter_4_distance_4_arm_neon
+
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_4_arm_neon(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  wuffs_base__slice_u8 v_curr = {0};
+  wuffs_base__slice_u8 v_prev = {0};
+  uint8x8_t v_fa = {0};
+  uint8x8_t v_fb = {0};
+  uint8x8_t v_fc = {0};
+  uint8x8_t v_fx = {0};
+  uint16x8_t v_fafb = {0};
+  uint16x8_t v_fcfc = {0};
+  uint16x8_t v_pa = {0};
+  uint16x8_t v_pb = {0};
+  uint16x8_t v_pc = {0};
+  uint16x8_t v_cmpab = {0};
+  uint16x8_t v_cmpac = {0};
+  uint8x8_t v_picka = {0};
+  uint8x8_t v_pickb = {0};
+
+  {
+    wuffs_base__slice_u8 i_slice_curr = a_curr;
+    v_curr.ptr = i_slice_curr.ptr;
+    wuffs_base__slice_u8 i_slice_prev = a_prev;
+    v_prev.ptr = i_slice_prev.ptr;
+    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
+    v_curr.len = 4;
+    v_prev.len = 4;
+    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
+    while (v_curr.ptr < i_end0_curr) {
+      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_fafb = vaddl_u8(v_fa, v_fb);
+      v_fcfc = vaddl_u8(v_fc, v_fc);
+      v_pa = vabdl_u8(v_fb, v_fc);
+      v_pb = vabdl_u8(v_fa, v_fc);
+      v_pc = vabdq_u16(v_fafb, v_fcfc);
+      v_cmpab = vcleq_u16(v_pa, v_pb);
+      v_cmpac = vcleq_u16(v_pa, v_pc);
+      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
+      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
+      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+      v_fc = v_fb;
+      v_fa = v_fx;
+      v_curr.ptr += 4;
+      v_prev.ptr += 4;
+      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_fafb = vaddl_u8(v_fa, v_fb);
+      v_fcfc = vaddl_u8(v_fc, v_fc);
+      v_pa = vabdl_u8(v_fb, v_fc);
+      v_pb = vabdl_u8(v_fa, v_fc);
+      v_pc = vabdq_u16(v_fafb, v_fcfc);
+      v_cmpab = vcleq_u16(v_pa, v_pb);
+      v_cmpac = vcleq_u16(v_pa, v_pc);
+      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
+      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
+      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+      v_fc = v_fb;
+      v_fa = v_fx;
+      v_curr.ptr += 4;
+      v_prev.ptr += 4;
+    }
+    v_curr.len = 4;
+    v_prev.len = 4;
+    uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+    while (v_curr.ptr < i_end1_curr) {
+      v_fb = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_fx = vreinterpret_u8_u32(vdup_n_u32(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_fafb = vaddl_u8(v_fa, v_fb);
+      v_fcfc = vaddl_u8(v_fc, v_fc);
+      v_pa = vabdl_u8(v_fb, v_fc);
+      v_pb = vabdl_u8(v_fa, v_fc);
+      v_pc = vabdq_u16(v_fafb, v_fcfc);
+      v_cmpab = vcleq_u16(v_pa, v_pb);
+      v_cmpac = vcleq_u16(v_pa, v_pc);
+      v_picka = vmovn_u16(vandq_u16(v_cmpab, v_cmpac));
+      v_pickb = vmovn_u16(vcleq_u16(v_pb, v_pc));
+      v_fx = vadd_u8(v_fx, vbsl_u8(v_picka, v_fa, vbsl_u8(v_pickb, v_fb, v_fc)));
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, vget_lane_u32(vreinterpret_u32_u8(v_fx), 0));
+      v_fc = v_fb;
+      v_fa = v_fx;
+      v_curr.ptr += 4;
+      v_prev.ptr += 4;
+    }
+    v_curr.len = 0;
+    v_prev.len = 0;
+  }
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+// ‼ WUFFS MULTI-FILE SECTION -arm_neon
+
+// -------- func png.decoder.filter_1
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr) {
+  return (*self->private_impl.choosy_filter_1)(self, a_curr);
+}
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1__choosy_default(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr) {
+  uint64_t v_filter_distance = 0;
+  uint8_t v_fa = 0;
+  uint64_t v_i_start = 0;
+  uint64_t v_i = 0;
+
+  v_filter_distance = ((uint64_t)(self->private_impl.f_filter_distance));
+  v_i_start = 0;
+  while (v_i_start < v_filter_distance) {
+    v_fa = 0;
+    v_i = v_i_start;
+    while (v_i < ((uint64_t)(a_curr.len))) {
+      a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + v_fa));
+      v_fa = a_curr.ptr[v_i];
+      v_i += v_filter_distance;
+    }
+    v_i_start += 1;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.filter_1_distance_3_fallback
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1_distance_3_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr) {
+  wuffs_base__slice_u8 v_curr = {0};
+  uint8_t v_fa0 = 0;
+  uint8_t v_fa1 = 0;
+  uint8_t v_fa2 = 0;
+
+  {
+    wuffs_base__slice_u8 i_slice_curr = a_curr;
+    v_curr.ptr = i_slice_curr.ptr;
+    v_curr.len = 3;
+    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 6) * 6);
+    while (v_curr.ptr < i_end0_curr) {
+      v_fa0 = ((uint8_t)(v_fa0 + v_curr.ptr[0]));
+      v_curr.ptr[0] = v_fa0;
+      v_fa1 = ((uint8_t)(v_fa1 + v_curr.ptr[1]));
+      v_curr.ptr[1] = v_fa1;
+      v_fa2 = ((uint8_t)(v_fa2 + v_curr.ptr[2]));
+      v_curr.ptr[2] = v_fa2;
+      v_curr.ptr += 3;
+      v_fa0 = ((uint8_t)(v_fa0 + v_curr.ptr[0]));
+      v_curr.ptr[0] = v_fa0;
+      v_fa1 = ((uint8_t)(v_fa1 + v_curr.ptr[1]));
+      v_curr.ptr[1] = v_fa1;
+      v_fa2 = ((uint8_t)(v_fa2 + v_curr.ptr[2]));
+      v_curr.ptr[2] = v_fa2;
+      v_curr.ptr += 3;
+    }
+    v_curr.len = 3;
+    uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
+    while (v_curr.ptr < i_end1_curr) {
+      v_fa0 = ((uint8_t)(v_fa0 + v_curr.ptr[0]));
+      v_curr.ptr[0] = v_fa0;
+      v_fa1 = ((uint8_t)(v_fa1 + v_curr.ptr[1]));
+      v_curr.ptr[1] = v_fa1;
+      v_fa2 = ((uint8_t)(v_fa2 + v_curr.ptr[2]));
+      v_curr.ptr[2] = v_fa2;
+      v_curr.ptr += 3;
+    }
+    v_curr.len = 0;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.filter_1_distance_4_fallback
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1_distance_4_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr) {
+  wuffs_base__slice_u8 v_curr = {0};
+  uint8_t v_fa0 = 0;
+  uint8_t v_fa1 = 0;
+  uint8_t v_fa2 = 0;
+  uint8_t v_fa3 = 0;
+
+  {
+    wuffs_base__slice_u8 i_slice_curr = a_curr;
+    v_curr.ptr = i_slice_curr.ptr;
+    v_curr.len = 4;
+    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+    while (v_curr.ptr < i_end0_curr) {
+      v_fa0 = ((uint8_t)(v_fa0 + v_curr.ptr[0]));
+      v_curr.ptr[0] = v_fa0;
+      v_fa1 = ((uint8_t)(v_fa1 + v_curr.ptr[1]));
+      v_curr.ptr[1] = v_fa1;
+      v_fa2 = ((uint8_t)(v_fa2 + v_curr.ptr[2]));
+      v_curr.ptr[2] = v_fa2;
+      v_fa3 = ((uint8_t)(v_fa3 + v_curr.ptr[3]));
+      v_curr.ptr[3] = v_fa3;
+      v_curr.ptr += 4;
+    }
+    v_curr.len = 0;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.filter_2
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_2(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  uint64_t v_n = 0;
+  uint64_t v_i = 0;
+
+  v_n = wuffs_base__u64__min(((uint64_t)(a_curr.len)), ((uint64_t)(a_prev.len)));
+  v_i = 0;
+  while (v_i < v_n) {
+    a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + a_prev.ptr[v_i]));
+    v_i += 1;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.filter_3
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  return (*self->private_impl.choosy_filter_3)(self, a_curr, a_prev);
+}
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3__choosy_default(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  uint64_t v_filter_distance = 0;
+  uint64_t v_n = 0;
+  uint64_t v_i = 0;
+
+  v_filter_distance = ((uint64_t)(self->private_impl.f_filter_distance));
+  if (((uint64_t)(a_prev.len)) == 0) {
+    v_i = v_filter_distance;
+    while (v_i < ((uint64_t)(a_curr.len))) {
+      a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + (a_curr.ptr[(v_i - v_filter_distance)] / 2)));
+      v_i += 1;
+    }
+  } else {
+    v_n = wuffs_base__u64__min(((uint64_t)(a_curr.len)), ((uint64_t)(a_prev.len)));
+    v_i = 0;
+    while ((v_i < v_n) && (v_i < v_filter_distance)) {
+      a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + (a_prev.ptr[v_i] / 2)));
+      v_i += 1;
+    }
+    v_i = v_filter_distance;
+    while (v_i < v_n) {
+      a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + ((uint8_t)(((((uint32_t)(a_curr.ptr[(v_i - v_filter_distance)])) + ((uint32_t)(a_prev.ptr[v_i]))) / 2)))));
+      v_i += 1;
+    }
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.filter_3_distance_3_fallback
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3_distance_3_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  wuffs_base__slice_u8 v_curr = {0};
+  wuffs_base__slice_u8 v_prev = {0};
+  uint8_t v_fa0 = 0;
+  uint8_t v_fa1 = 0;
+  uint8_t v_fa2 = 0;
+
+  if (((uint64_t)(a_prev.len)) == 0) {
+    {
+      wuffs_base__slice_u8 i_slice_curr = a_curr;
+      v_curr.ptr = i_slice_curr.ptr;
+      v_curr.len = 3;
+      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 6) * 6);
+      while (v_curr.ptr < i_end0_curr) {
+        v_fa0 = ((uint8_t)((v_fa0 / 2) + v_curr.ptr[0]));
+        v_curr.ptr[0] = v_fa0;
+        v_fa1 = ((uint8_t)((v_fa1 / 2) + v_curr.ptr[1]));
+        v_curr.ptr[1] = v_fa1;
+        v_fa2 = ((uint8_t)((v_fa2 / 2) + v_curr.ptr[2]));
+        v_curr.ptr[2] = v_fa2;
+        v_curr.ptr += 3;
+        v_fa0 = ((uint8_t)((v_fa0 / 2) + v_curr.ptr[0]));
+        v_curr.ptr[0] = v_fa0;
+        v_fa1 = ((uint8_t)((v_fa1 / 2) + v_curr.ptr[1]));
+        v_curr.ptr[1] = v_fa1;
+        v_fa2 = ((uint8_t)((v_fa2 / 2) + v_curr.ptr[2]));
+        v_curr.ptr[2] = v_fa2;
+        v_curr.ptr += 3;
+      }
+      v_curr.len = 3;
+      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
+      while (v_curr.ptr < i_end1_curr) {
+        v_fa0 = ((uint8_t)((v_fa0 / 2) + v_curr.ptr[0]));
+        v_curr.ptr[0] = v_fa0;
+        v_fa1 = ((uint8_t)((v_fa1 / 2) + v_curr.ptr[1]));
+        v_curr.ptr[1] = v_fa1;
+        v_fa2 = ((uint8_t)((v_fa2 / 2) + v_curr.ptr[2]));
+        v_curr.ptr[2] = v_fa2;
+        v_curr.ptr += 3;
+      }
+      v_curr.len = 0;
+    }
+  } else {
+    {
+      wuffs_base__slice_u8 i_slice_curr = a_curr;
+      v_curr.ptr = i_slice_curr.ptr;
+      wuffs_base__slice_u8 i_slice_prev = a_prev;
+      v_prev.ptr = i_slice_prev.ptr;
+      i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
+      v_curr.len = 3;
+      v_prev.len = 3;
+      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 6) * 6);
+      while (v_curr.ptr < i_end0_curr) {
+        v_fa0 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa0)) + ((uint32_t)(v_prev.ptr[0]))) / 2))) + v_curr.ptr[0]));
+        v_curr.ptr[0] = v_fa0;
+        v_fa1 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa1)) + ((uint32_t)(v_prev.ptr[1]))) / 2))) + v_curr.ptr[1]));
+        v_curr.ptr[1] = v_fa1;
+        v_fa2 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa2)) + ((uint32_t)(v_prev.ptr[2]))) / 2))) + v_curr.ptr[2]));
+        v_curr.ptr[2] = v_fa2;
+        v_curr.ptr += 3;
+        v_prev.ptr += 3;
+        v_fa0 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa0)) + ((uint32_t)(v_prev.ptr[0]))) / 2))) + v_curr.ptr[0]));
+        v_curr.ptr[0] = v_fa0;
+        v_fa1 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa1)) + ((uint32_t)(v_prev.ptr[1]))) / 2))) + v_curr.ptr[1]));
+        v_curr.ptr[1] = v_fa1;
+        v_fa2 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa2)) + ((uint32_t)(v_prev.ptr[2]))) / 2))) + v_curr.ptr[2]));
+        v_curr.ptr[2] = v_fa2;
+        v_curr.ptr += 3;
+        v_prev.ptr += 3;
+      }
+      v_curr.len = 3;
+      v_prev.len = 3;
+      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
+      while (v_curr.ptr < i_end1_curr) {
+        v_fa0 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa0)) + ((uint32_t)(v_prev.ptr[0]))) / 2))) + v_curr.ptr[0]));
+        v_curr.ptr[0] = v_fa0;
+        v_fa1 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa1)) + ((uint32_t)(v_prev.ptr[1]))) / 2))) + v_curr.ptr[1]));
+        v_curr.ptr[1] = v_fa1;
+        v_fa2 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa2)) + ((uint32_t)(v_prev.ptr[2]))) / 2))) + v_curr.ptr[2]));
+        v_curr.ptr[2] = v_fa2;
+        v_curr.ptr += 3;
+        v_prev.ptr += 3;
+      }
+      v_curr.len = 0;
+      v_prev.len = 0;
+    }
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.filter_3_distance_4_fallback
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3_distance_4_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  wuffs_base__slice_u8 v_curr = {0};
+  wuffs_base__slice_u8 v_prev = {0};
+  uint8_t v_fa0 = 0;
+  uint8_t v_fa1 = 0;
+  uint8_t v_fa2 = 0;
+  uint8_t v_fa3 = 0;
+
+  if (((uint64_t)(a_prev.len)) == 0) {
+    {
+      wuffs_base__slice_u8 i_slice_curr = a_curr;
+      v_curr.ptr = i_slice_curr.ptr;
+      v_curr.len = 4;
+      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+      while (v_curr.ptr < i_end0_curr) {
+        v_fa0 = ((uint8_t)((v_fa0 / 2) + v_curr.ptr[0]));
+        v_curr.ptr[0] = v_fa0;
+        v_fa1 = ((uint8_t)((v_fa1 / 2) + v_curr.ptr[1]));
+        v_curr.ptr[1] = v_fa1;
+        v_fa2 = ((uint8_t)((v_fa2 / 2) + v_curr.ptr[2]));
+        v_curr.ptr[2] = v_fa2;
+        v_fa3 = ((uint8_t)((v_fa3 / 2) + v_curr.ptr[3]));
+        v_curr.ptr[3] = v_fa3;
+        v_curr.ptr += 4;
+      }
+      v_curr.len = 0;
+    }
+  } else {
+    {
+      wuffs_base__slice_u8 i_slice_curr = a_curr;
+      v_curr.ptr = i_slice_curr.ptr;
+      wuffs_base__slice_u8 i_slice_prev = a_prev;
+      v_prev.ptr = i_slice_prev.ptr;
+      i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
+      v_curr.len = 4;
+      v_prev.len = 4;
+      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+      while (v_curr.ptr < i_end0_curr) {
+        v_fa0 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa0)) + ((uint32_t)(v_prev.ptr[0]))) / 2))) + v_curr.ptr[0]));
+        v_curr.ptr[0] = v_fa0;
+        v_fa1 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa1)) + ((uint32_t)(v_prev.ptr[1]))) / 2))) + v_curr.ptr[1]));
+        v_curr.ptr[1] = v_fa1;
+        v_fa2 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa2)) + ((uint32_t)(v_prev.ptr[2]))) / 2))) + v_curr.ptr[2]));
+        v_curr.ptr[2] = v_fa2;
+        v_fa3 = ((uint8_t)(((uint8_t)(((((uint32_t)(v_fa3)) + ((uint32_t)(v_prev.ptr[3]))) / 2))) + v_curr.ptr[3]));
+        v_curr.ptr[3] = v_fa3;
+        v_curr.ptr += 4;
+        v_prev.ptr += 4;
+      }
+      v_curr.len = 0;
+      v_prev.len = 0;
+    }
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.filter_4
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  return (*self->private_impl.choosy_filter_4)(self, a_curr, a_prev);
+}
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4__choosy_default(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  uint64_t v_filter_distance = 0;
+  uint64_t v_n = 0;
+  uint64_t v_i = 0;
+  uint32_t v_fa = 0;
+  uint32_t v_fb = 0;
+  uint32_t v_fc = 0;
+  uint32_t v_pp = 0;
+  uint32_t v_pa = 0;
+  uint32_t v_pb = 0;
+  uint32_t v_pc = 0;
+
+  v_filter_distance = ((uint64_t)(self->private_impl.f_filter_distance));
+  v_n = wuffs_base__u64__min(((uint64_t)(a_curr.len)), ((uint64_t)(a_prev.len)));
+  v_i = 0;
+  while ((v_i < v_n) && (v_i < v_filter_distance)) {
+    a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + a_prev.ptr[v_i]));
+    v_i += 1;
+  }
+  v_i = v_filter_distance;
+  while (v_i < v_n) {
+    v_fa = ((uint32_t)(a_curr.ptr[(v_i - v_filter_distance)]));
+    v_fb = ((uint32_t)(a_prev.ptr[v_i]));
+    v_fc = ((uint32_t)(a_prev.ptr[(v_i - v_filter_distance)]));
+    v_pp = ((uint32_t)(((uint32_t)(v_fa + v_fb)) - v_fc));
+    v_pa = ((uint32_t)(v_pp - v_fa));
+    if (v_pa >= 2147483648) {
+      v_pa = ((uint32_t)(0 - v_pa));
+    }
+    v_pb = ((uint32_t)(v_pp - v_fb));
+    if (v_pb >= 2147483648) {
+      v_pb = ((uint32_t)(0 - v_pb));
+    }
+    v_pc = ((uint32_t)(v_pp - v_fc));
+    if (v_pc >= 2147483648) {
+      v_pc = ((uint32_t)(0 - v_pc));
+    }
+    if ((v_pa <= v_pb) && (v_pa <= v_pc)) {
+    } else if (v_pb <= v_pc) {
+      v_fa = v_fb;
+    } else {
+      v_fa = v_fc;
+    }
+    a_curr.ptr[v_i] = ((uint8_t)(a_curr.ptr[v_i] + ((uint8_t)((v_fa & 255)))));
+    v_i += 1;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.filter_4_distance_3_fallback
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_3_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  wuffs_base__slice_u8 v_curr = {0};
+  wuffs_base__slice_u8 v_prev = {0};
+  uint32_t v_fa0 = 0;
+  uint32_t v_fa1 = 0;
+  uint32_t v_fa2 = 0;
+  uint32_t v_fb0 = 0;
+  uint32_t v_fb1 = 0;
+  uint32_t v_fb2 = 0;
+  uint32_t v_fc0 = 0;
+  uint32_t v_fc1 = 0;
+  uint32_t v_fc2 = 0;
+  uint32_t v_pp0 = 0;
+  uint32_t v_pp1 = 0;
+  uint32_t v_pp2 = 0;
+  uint32_t v_pa0 = 0;
+  uint32_t v_pa1 = 0;
+  uint32_t v_pa2 = 0;
+  uint32_t v_pb0 = 0;
+  uint32_t v_pb1 = 0;
+  uint32_t v_pb2 = 0;
+  uint32_t v_pc0 = 0;
+  uint32_t v_pc1 = 0;
+  uint32_t v_pc2 = 0;
+
+  {
+    wuffs_base__slice_u8 i_slice_curr = a_curr;
+    v_curr.ptr = i_slice_curr.ptr;
+    wuffs_base__slice_u8 i_slice_prev = a_prev;
+    v_prev.ptr = i_slice_prev.ptr;
+    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
+    v_curr.len = 3;
+    v_prev.len = 3;
+    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
+    while (v_curr.ptr < i_end0_curr) {
+      v_fb0 = ((uint32_t)(v_prev.ptr[0]));
+      v_pp0 = ((uint32_t)(((uint32_t)(v_fa0 + v_fb0)) - v_fc0));
+      v_pa0 = ((uint32_t)(v_pp0 - v_fa0));
+      if (v_pa0 >= 2147483648) {
+        v_pa0 = ((uint32_t)(0 - v_pa0));
+      }
+      v_pb0 = ((uint32_t)(v_pp0 - v_fb0));
+      if (v_pb0 >= 2147483648) {
+        v_pb0 = ((uint32_t)(0 - v_pb0));
+      }
+      v_pc0 = ((uint32_t)(v_pp0 - v_fc0));
+      if (v_pc0 >= 2147483648) {
+        v_pc0 = ((uint32_t)(0 - v_pc0));
+      }
+      if ((v_pa0 <= v_pb0) && (v_pa0 <= v_pc0)) {
+      } else if (v_pb0 <= v_pc0) {
+        v_fa0 = v_fb0;
+      } else {
+        v_fa0 = v_fc0;
+      }
+      v_curr.ptr[0] = ((uint8_t)(v_curr.ptr[0] + ((uint8_t)((v_fa0 & 255)))));
+      v_fa0 = ((uint32_t)(v_curr.ptr[0]));
+      v_fc0 = v_fb0;
+      v_fb1 = ((uint32_t)(v_prev.ptr[1]));
+      v_pp1 = ((uint32_t)(((uint32_t)(v_fa1 + v_fb1)) - v_fc1));
+      v_pa1 = ((uint32_t)(v_pp1 - v_fa1));
+      if (v_pa1 >= 2147483648) {
+        v_pa1 = ((uint32_t)(0 - v_pa1));
+      }
+      v_pb1 = ((uint32_t)(v_pp1 - v_fb1));
+      if (v_pb1 >= 2147483648) {
+        v_pb1 = ((uint32_t)(0 - v_pb1));
+      }
+      v_pc1 = ((uint32_t)(v_pp1 - v_fc1));
+      if (v_pc1 >= 2147483648) {
+        v_pc1 = ((uint32_t)(0 - v_pc1));
+      }
+      if ((v_pa1 <= v_pb1) && (v_pa1 <= v_pc1)) {
+      } else if (v_pb1 <= v_pc1) {
+        v_fa1 = v_fb1;
+      } else {
+        v_fa1 = v_fc1;
+      }
+      v_curr.ptr[1] = ((uint8_t)(v_curr.ptr[1] + ((uint8_t)((v_fa1 & 255)))));
+      v_fa1 = ((uint32_t)(v_curr.ptr[1]));
+      v_fc1 = v_fb1;
+      v_fb2 = ((uint32_t)(v_prev.ptr[2]));
+      v_pp2 = ((uint32_t)(((uint32_t)(v_fa2 + v_fb2)) - v_fc2));
+      v_pa2 = ((uint32_t)(v_pp2 - v_fa2));
+      if (v_pa2 >= 2147483648) {
+        v_pa2 = ((uint32_t)(0 - v_pa2));
+      }
+      v_pb2 = ((uint32_t)(v_pp2 - v_fb2));
+      if (v_pb2 >= 2147483648) {
+        v_pb2 = ((uint32_t)(0 - v_pb2));
+      }
+      v_pc2 = ((uint32_t)(v_pp2 - v_fc2));
+      if (v_pc2 >= 2147483648) {
+        v_pc2 = ((uint32_t)(0 - v_pc2));
+      }
+      if ((v_pa2 <= v_pb2) && (v_pa2 <= v_pc2)) {
+      } else if (v_pb2 <= v_pc2) {
+        v_fa2 = v_fb2;
+      } else {
+        v_fa2 = v_fc2;
+      }
+      v_curr.ptr[2] = ((uint8_t)(v_curr.ptr[2] + ((uint8_t)((v_fa2 & 255)))));
+      v_fa2 = ((uint32_t)(v_curr.ptr[2]));
+      v_fc2 = v_fb2;
+      v_curr.ptr += 3;
+      v_prev.ptr += 3;
+    }
+    v_curr.len = 0;
+    v_prev.len = 0;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.filter_4_distance_4_fallback
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_4_fallback(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  wuffs_base__slice_u8 v_curr = {0};
+  wuffs_base__slice_u8 v_prev = {0};
+  uint32_t v_fa0 = 0;
+  uint32_t v_fa1 = 0;
+  uint32_t v_fa2 = 0;
+  uint32_t v_fa3 = 0;
+  uint32_t v_fb0 = 0;
+  uint32_t v_fb1 = 0;
+  uint32_t v_fb2 = 0;
+  uint32_t v_fb3 = 0;
+  uint32_t v_fc0 = 0;
+  uint32_t v_fc1 = 0;
+  uint32_t v_fc2 = 0;
+  uint32_t v_fc3 = 0;
+  uint32_t v_pp0 = 0;
+  uint32_t v_pp1 = 0;
+  uint32_t v_pp2 = 0;
+  uint32_t v_pp3 = 0;
+  uint32_t v_pa0 = 0;
+  uint32_t v_pa1 = 0;
+  uint32_t v_pa2 = 0;
+  uint32_t v_pa3 = 0;
+  uint32_t v_pb0 = 0;
+  uint32_t v_pb1 = 0;
+  uint32_t v_pb2 = 0;
+  uint32_t v_pb3 = 0;
+  uint32_t v_pc0 = 0;
+  uint32_t v_pc1 = 0;
+  uint32_t v_pc2 = 0;
+  uint32_t v_pc3 = 0;
+
+  {
+    wuffs_base__slice_u8 i_slice_curr = a_curr;
+    v_curr.ptr = i_slice_curr.ptr;
+    wuffs_base__slice_u8 i_slice_prev = a_prev;
+    v_prev.ptr = i_slice_prev.ptr;
+    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
+    v_curr.len = 4;
+    v_prev.len = 4;
+    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+    while (v_curr.ptr < i_end0_curr) {
+      v_fb0 = ((uint32_t)(v_prev.ptr[0]));
+      v_pp0 = ((uint32_t)(((uint32_t)(v_fa0 + v_fb0)) - v_fc0));
+      v_pa0 = ((uint32_t)(v_pp0 - v_fa0));
+      if (v_pa0 >= 2147483648) {
+        v_pa0 = ((uint32_t)(0 - v_pa0));
+      }
+      v_pb0 = ((uint32_t)(v_pp0 - v_fb0));
+      if (v_pb0 >= 2147483648) {
+        v_pb0 = ((uint32_t)(0 - v_pb0));
+      }
+      v_pc0 = ((uint32_t)(v_pp0 - v_fc0));
+      if (v_pc0 >= 2147483648) {
+        v_pc0 = ((uint32_t)(0 - v_pc0));
+      }
+      if ((v_pa0 <= v_pb0) && (v_pa0 <= v_pc0)) {
+      } else if (v_pb0 <= v_pc0) {
+        v_fa0 = v_fb0;
+      } else {
+        v_fa0 = v_fc0;
+      }
+      v_curr.ptr[0] = ((uint8_t)(v_curr.ptr[0] + ((uint8_t)((v_fa0 & 255)))));
+      v_fa0 = ((uint32_t)(v_curr.ptr[0]));
+      v_fc0 = v_fb0;
+      v_fb1 = ((uint32_t)(v_prev.ptr[1]));
+      v_pp1 = ((uint32_t)(((uint32_t)(v_fa1 + v_fb1)) - v_fc1));
+      v_pa1 = ((uint32_t)(v_pp1 - v_fa1));
+      if (v_pa1 >= 2147483648) {
+        v_pa1 = ((uint32_t)(0 - v_pa1));
+      }
+      v_pb1 = ((uint32_t)(v_pp1 - v_fb1));
+      if (v_pb1 >= 2147483648) {
+        v_pb1 = ((uint32_t)(0 - v_pb1));
+      }
+      v_pc1 = ((uint32_t)(v_pp1 - v_fc1));
+      if (v_pc1 >= 2147483648) {
+        v_pc1 = ((uint32_t)(0 - v_pc1));
+      }
+      if ((v_pa1 <= v_pb1) && (v_pa1 <= v_pc1)) {
+      } else if (v_pb1 <= v_pc1) {
+        v_fa1 = v_fb1;
+      } else {
+        v_fa1 = v_fc1;
+      }
+      v_curr.ptr[1] = ((uint8_t)(v_curr.ptr[1] + ((uint8_t)((v_fa1 & 255)))));
+      v_fa1 = ((uint32_t)(v_curr.ptr[1]));
+      v_fc1 = v_fb1;
+      v_fb2 = ((uint32_t)(v_prev.ptr[2]));
+      v_pp2 = ((uint32_t)(((uint32_t)(v_fa2 + v_fb2)) - v_fc2));
+      v_pa2 = ((uint32_t)(v_pp2 - v_fa2));
+      if (v_pa2 >= 2147483648) {
+        v_pa2 = ((uint32_t)(0 - v_pa2));
+      }
+      v_pb2 = ((uint32_t)(v_pp2 - v_fb2));
+      if (v_pb2 >= 2147483648) {
+        v_pb2 = ((uint32_t)(0 - v_pb2));
+      }
+      v_pc2 = ((uint32_t)(v_pp2 - v_fc2));
+      if (v_pc2 >= 2147483648) {
+        v_pc2 = ((uint32_t)(0 - v_pc2));
+      }
+      if ((v_pa2 <= v_pb2) && (v_pa2 <= v_pc2)) {
+      } else if (v_pb2 <= v_pc2) {
+        v_fa2 = v_fb2;
+      } else {
+        v_fa2 = v_fc2;
+      }
+      v_curr.ptr[2] = ((uint8_t)(v_curr.ptr[2] + ((uint8_t)((v_fa2 & 255)))));
+      v_fa2 = ((uint32_t)(v_curr.ptr[2]));
+      v_fc2 = v_fb2;
+      v_fb3 = ((uint32_t)(v_prev.ptr[3]));
+      v_pp3 = ((uint32_t)(((uint32_t)(v_fa3 + v_fb3)) - v_fc3));
+      v_pa3 = ((uint32_t)(v_pp3 - v_fa3));
+      if (v_pa3 >= 2147483648) {
+        v_pa3 = ((uint32_t)(0 - v_pa3));
+      }
+      v_pb3 = ((uint32_t)(v_pp3 - v_fb3));
+      if (v_pb3 >= 2147483648) {
+        v_pb3 = ((uint32_t)(0 - v_pb3));
+      }
+      v_pc3 = ((uint32_t)(v_pp3 - v_fc3));
+      if (v_pc3 >= 2147483648) {
+        v_pc3 = ((uint32_t)(0 - v_pc3));
+      }
+      if ((v_pa3 <= v_pb3) && (v_pa3 <= v_pc3)) {
+      } else if (v_pb3 <= v_pc3) {
+        v_fa3 = v_fb3;
+      } else {
+        v_fa3 = v_fc3;
+      }
+      v_curr.ptr[3] = ((uint8_t)(v_curr.ptr[3] + ((uint8_t)((v_fa3 & 255)))));
+      v_fa3 = ((uint32_t)(v_curr.ptr[3]));
+      v_fc3 = v_fb3;
+      v_curr.ptr += 4;
+      v_prev.ptr += 4;
+    }
+    v_curr.len = 0;
+    v_prev.len = 0;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_sse42
+// -------- func png.decoder.filter_1_distance_4_x86_sse42
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2")
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_1_distance_4_x86_sse42(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr) {
+  wuffs_base__slice_u8 v_curr = {0};
+  __m128i v_x128 = {0};
+  __m128i v_a128 = {0};
+
+  {
+    wuffs_base__slice_u8 i_slice_curr = a_curr;
+    v_curr.ptr = i_slice_curr.ptr;
+    v_curr.len = 4;
+    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
+    while (v_curr.ptr < i_end0_curr) {
+      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_x128 = _mm_add_epi8(v_x128, v_a128);
+      v_a128 = v_x128;
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+      v_curr.ptr += 4;
+      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_x128 = _mm_add_epi8(v_x128, v_a128);
+      v_a128 = v_x128;
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+      v_curr.ptr += 4;
+    }
+    v_curr.len = 4;
+    uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+    while (v_curr.ptr < i_end1_curr) {
+      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_x128 = _mm_add_epi8(v_x128, v_a128);
+      v_a128 = v_x128;
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+      v_curr.ptr += 4;
+    }
+    v_curr.len = 0;
+  }
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_sse42
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_sse42
+// -------- func png.decoder.filter_3_distance_4_x86_sse42
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2")
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_3_distance_4_x86_sse42(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  wuffs_base__slice_u8 v_curr = {0};
+  wuffs_base__slice_u8 v_prev = {0};
+  __m128i v_x128 = {0};
+  __m128i v_a128 = {0};
+  __m128i v_b128 = {0};
+  __m128i v_p128 = {0};
+  __m128i v_k128 = {0};
+
+  if (((uint64_t)(a_prev.len)) == 0) {
+    v_k128 = _mm_set1_epi8((int8_t)(254));
+    {
+      wuffs_base__slice_u8 i_slice_curr = a_curr;
+      v_curr.ptr = i_slice_curr.ptr;
+      v_curr.len = 4;
+      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
+      while (v_curr.ptr < i_end0_curr) {
+        v_p128 = _mm_avg_epu8(_mm_and_si128(v_a128, v_k128), v_b128);
+        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_x128 = _mm_add_epi8(v_x128, v_p128);
+        v_a128 = v_x128;
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+        v_curr.ptr += 4;
+        v_p128 = _mm_avg_epu8(_mm_and_si128(v_a128, v_k128), v_b128);
+        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_x128 = _mm_add_epi8(v_x128, v_p128);
+        v_a128 = v_x128;
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+        v_curr.ptr += 4;
+      }
+      v_curr.len = 4;
+      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+      while (v_curr.ptr < i_end1_curr) {
+        v_p128 = _mm_avg_epu8(_mm_and_si128(v_a128, v_k128), v_b128);
+        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_x128 = _mm_add_epi8(v_x128, v_p128);
+        v_a128 = v_x128;
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+        v_curr.ptr += 4;
+      }
+      v_curr.len = 0;
+    }
+  } else {
+    v_k128 = _mm_set1_epi8((int8_t)(1));
+    {
+      wuffs_base__slice_u8 i_slice_curr = a_curr;
+      v_curr.ptr = i_slice_curr.ptr;
+      wuffs_base__slice_u8 i_slice_prev = a_prev;
+      v_prev.ptr = i_slice_prev.ptr;
+      i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
+      v_curr.len = 4;
+      v_prev.len = 4;
+      uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
+      while (v_curr.ptr < i_end0_curr) {
+        v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+        v_p128 = _mm_avg_epu8(v_a128, v_b128);
+        v_p128 = _mm_sub_epi8(v_p128, _mm_and_si128(v_k128, _mm_xor_si128(v_a128, v_b128)));
+        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_x128 = _mm_add_epi8(v_x128, v_p128);
+        v_a128 = v_x128;
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+        v_curr.ptr += 4;
+        v_prev.ptr += 4;
+        v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+        v_p128 = _mm_avg_epu8(v_a128, v_b128);
+        v_p128 = _mm_sub_epi8(v_p128, _mm_and_si128(v_k128, _mm_xor_si128(v_a128, v_b128)));
+        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_x128 = _mm_add_epi8(v_x128, v_p128);
+        v_a128 = v_x128;
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+        v_curr.ptr += 4;
+        v_prev.ptr += 4;
+      }
+      v_curr.len = 4;
+      v_prev.len = 4;
+      uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+      while (v_curr.ptr < i_end1_curr) {
+        v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+        v_p128 = _mm_avg_epu8(v_a128, v_b128);
+        v_p128 = _mm_sub_epi8(v_p128, _mm_and_si128(v_k128, _mm_xor_si128(v_a128, v_b128)));
+        v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+        v_x128 = _mm_add_epi8(v_x128, v_p128);
+        v_a128 = v_x128;
+        wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+        v_curr.ptr += 4;
+        v_prev.ptr += 4;
+      }
+      v_curr.len = 0;
+      v_prev.len = 0;
+    }
+  }
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_sse42
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_sse42
+// -------- func png.decoder.filter_4_distance_3_x86_sse42
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2")
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_3_x86_sse42(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  wuffs_base__slice_u8 v_curr = {0};
+  wuffs_base__slice_u8 v_prev = {0};
+  __m128i v_x128 = {0};
+  __m128i v_a128 = {0};
+  __m128i v_b128 = {0};
+  __m128i v_c128 = {0};
+  __m128i v_p128 = {0};
+  __m128i v_pa128 = {0};
+  __m128i v_pb128 = {0};
+  __m128i v_pc128 = {0};
+  __m128i v_smallest128 = {0};
+  __m128i v_z128 = {0};
+
+  {
+    wuffs_base__slice_u8 i_slice_curr = a_curr;
+    v_curr.ptr = i_slice_curr.ptr;
+    wuffs_base__slice_u8 i_slice_prev = a_prev;
+    v_prev.ptr = i_slice_prev.ptr;
+    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
+    v_curr.len = 4;
+    v_prev.len = 4;
+    uint8_t* i_end0_curr = v_curr.ptr + wuffs_base__iterate_total_advance((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)), 7, 6);
+    while (v_curr.ptr < i_end0_curr) {
+      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
+      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
+      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
+      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
+      v_pa128 = _mm_abs_epi16(v_pa128);
+      v_pb128 = _mm_abs_epi16(v_pb128);
+      v_pc128 = _mm_abs_epi16(v_pc128);
+      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
+      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
+      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
+      v_x128 = _mm_add_epi8(v_x128, v_p128);
+      v_a128 = v_x128;
+      v_c128 = v_b128;
+      v_x128 = _mm_packus_epi16(v_x128, v_x128);
+      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+      v_curr.ptr += 3;
+      v_prev.ptr += 3;
+      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
+      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
+      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
+      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
+      v_pa128 = _mm_abs_epi16(v_pa128);
+      v_pb128 = _mm_abs_epi16(v_pb128);
+      v_pc128 = _mm_abs_epi16(v_pc128);
+      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
+      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
+      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
+      v_x128 = _mm_add_epi8(v_x128, v_p128);
+      v_a128 = v_x128;
+      v_c128 = v_b128;
+      v_x128 = _mm_packus_epi16(v_x128, v_x128);
+      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+      v_curr.ptr += 3;
+      v_prev.ptr += 3;
+    }
+    v_curr.len = 4;
+    v_prev.len = 4;
+    uint8_t* i_end1_curr = v_curr.ptr + wuffs_base__iterate_total_advance((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)), 4, 3);
+    while (v_curr.ptr < i_end1_curr) {
+      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
+      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
+      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
+      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
+      v_pa128 = _mm_abs_epi16(v_pa128);
+      v_pb128 = _mm_abs_epi16(v_pb128);
+      v_pc128 = _mm_abs_epi16(v_pc128);
+      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
+      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
+      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
+      v_x128 = _mm_add_epi8(v_x128, v_p128);
+      v_a128 = v_x128;
+      v_c128 = v_b128;
+      v_x128 = _mm_packus_epi16(v_x128, v_x128);
+      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+      v_curr.ptr += 3;
+      v_prev.ptr += 3;
+    }
+    v_curr.len = 3;
+    v_prev.len = 3;
+    uint8_t* i_end2_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 3) * 3);
+    while (v_curr.ptr < i_end2_curr) {
+      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u24le__no_bounds_check(v_prev.ptr)));
+      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
+      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
+      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
+      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
+      v_pa128 = _mm_abs_epi16(v_pa128);
+      v_pb128 = _mm_abs_epi16(v_pb128);
+      v_pc128 = _mm_abs_epi16(v_pc128);
+      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
+      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
+      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u24le__no_bounds_check(v_curr.ptr)));
+      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
+      v_x128 = _mm_add_epi8(v_x128, v_p128);
+      v_x128 = _mm_packus_epi16(v_x128, v_x128);
+      wuffs_base__poke_u24le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+      v_curr.ptr += 3;
+      v_prev.ptr += 3;
+    }
+    v_curr.len = 0;
+    v_prev.len = 0;
+  }
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_sse42
+
+// ‼ WUFFS MULTI-FILE SECTION +x86_sse42
+// -------- func png.decoder.filter_4_distance_4_x86_sse42
+
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+WUFFS_BASE__MAYBE_ATTRIBUTE_TARGET("pclmul,popcnt,sse4.2")
+static wuffs_base__empty_struct
+wuffs_png__decoder__filter_4_distance_4_x86_sse42(
+    wuffs_png__decoder* self,
+    wuffs_base__slice_u8 a_curr,
+    wuffs_base__slice_u8 a_prev) {
+  wuffs_base__slice_u8 v_curr = {0};
+  wuffs_base__slice_u8 v_prev = {0};
+  __m128i v_x128 = {0};
+  __m128i v_a128 = {0};
+  __m128i v_b128 = {0};
+  __m128i v_c128 = {0};
+  __m128i v_p128 = {0};
+  __m128i v_pa128 = {0};
+  __m128i v_pb128 = {0};
+  __m128i v_pc128 = {0};
+  __m128i v_smallest128 = {0};
+  __m128i v_z128 = {0};
+
+  {
+    wuffs_base__slice_u8 i_slice_curr = a_curr;
+    v_curr.ptr = i_slice_curr.ptr;
+    wuffs_base__slice_u8 i_slice_prev = a_prev;
+    v_prev.ptr = i_slice_prev.ptr;
+    i_slice_curr.len = ((size_t)(wuffs_base__u64__min(i_slice_curr.len, i_slice_prev.len)));
+    v_curr.len = 4;
+    v_prev.len = 4;
+    uint8_t* i_end0_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 8) * 8);
+    while (v_curr.ptr < i_end0_curr) {
+      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
+      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
+      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
+      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
+      v_pa128 = _mm_abs_epi16(v_pa128);
+      v_pb128 = _mm_abs_epi16(v_pb128);
+      v_pc128 = _mm_abs_epi16(v_pc128);
+      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
+      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
+      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
+      v_x128 = _mm_add_epi8(v_x128, v_p128);
+      v_a128 = v_x128;
+      v_c128 = v_b128;
+      v_x128 = _mm_packus_epi16(v_x128, v_x128);
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+      v_curr.ptr += 4;
+      v_prev.ptr += 4;
+      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
+      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
+      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
+      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
+      v_pa128 = _mm_abs_epi16(v_pa128);
+      v_pb128 = _mm_abs_epi16(v_pb128);
+      v_pc128 = _mm_abs_epi16(v_pc128);
+      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
+      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
+      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
+      v_x128 = _mm_add_epi8(v_x128, v_p128);
+      v_a128 = v_x128;
+      v_c128 = v_b128;
+      v_x128 = _mm_packus_epi16(v_x128, v_x128);
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+      v_curr.ptr += 4;
+      v_prev.ptr += 4;
+    }
+    v_curr.len = 4;
+    v_prev.len = 4;
+    uint8_t* i_end1_curr = v_curr.ptr + (((i_slice_curr.len - (size_t)(v_curr.ptr - i_slice_curr.ptr)) / 4) * 4);
+    while (v_curr.ptr < i_end1_curr) {
+      v_b128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_prev.ptr)));
+      v_b128 = _mm_unpacklo_epi8(v_b128, v_z128);
+      v_pa128 = _mm_sub_epi16(v_b128, v_c128);
+      v_pb128 = _mm_sub_epi16(v_a128, v_c128);
+      v_pc128 = _mm_add_epi16(v_pa128, v_pb128);
+      v_pa128 = _mm_abs_epi16(v_pa128);
+      v_pb128 = _mm_abs_epi16(v_pb128);
+      v_pc128 = _mm_abs_epi16(v_pc128);
+      v_smallest128 = _mm_min_epi16(v_pc128, _mm_min_epi16(v_pb128, v_pa128));
+      v_p128 = _mm_blendv_epi8(_mm_blendv_epi8(v_c128, v_b128, _mm_cmpeq_epi16(v_smallest128, v_pb128)), v_a128, _mm_cmpeq_epi16(v_smallest128, v_pa128));
+      v_x128 = _mm_cvtsi32_si128((int32_t)(wuffs_base__peek_u32le__no_bounds_check(v_curr.ptr)));
+      v_x128 = _mm_unpacklo_epi8(v_x128, v_z128);
+      v_x128 = _mm_add_epi8(v_x128, v_p128);
+      v_a128 = v_x128;
+      v_c128 = v_b128;
+      v_x128 = _mm_packus_epi16(v_x128, v_x128);
+      wuffs_base__poke_u32le__no_bounds_check(v_curr.ptr, ((uint32_t)(_mm_cvtsi128_si32(v_x128))));
+      v_curr.ptr += 4;
+      v_prev.ptr += 4;
+    }
+    v_curr.len = 0;
+    v_prev.len = 0;
+  }
+  return wuffs_base__make_empty_struct();
+}
+#endif  // defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+// ‼ WUFFS MULTI-FILE SECTION -x86_sse42
+
+// -------- func png.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_png__decoder__set_quirk_enabled(
+    wuffs_png__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (a_quirk == 1) {
+    self->private_impl.f_ignore_checksum = a_enabled;
+    wuffs_zlib__decoder__set_quirk_enabled(&self->private_data.f_zlib, a_quirk, a_enabled);
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.decode_image_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_png__decoder__decode_image_config(
+    wuffs_png__decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint64_t v_magic = 0;
+  uint64_t v_mark = 0;
+  uint32_t v_checksum_have = 0;
+  uint32_t v_checksum_want = 0;
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
+  if (coro_susp_point) {
+    v_checksum_have = self->private_data.s_decode_image_config[0].v_checksum_have;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence == 2) {
+      if (self->private_impl.f_metadata_fourcc != 0) {
+        self->private_impl.f_call_sequence = 1;
+        status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
+        goto ok;
+      }
+    } else if (self->private_impl.f_call_sequence != 0) {
+      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+      goto exit;
+    } else {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        uint64_t t_0;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 8)) {
+          t_0 = wuffs_base__peek_u64le__no_bounds_check(iop_a_src);
+          iop_a_src += 8;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_0 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_0;
+            if (num_bits_0 == 56) {
+              t_0 = ((uint64_t)(*scratch));
+              break;
+            }
+            num_bits_0 += 8;
+            *scratch |= ((uint64_t)(num_bits_0)) << 56;
+          }
+        }
+        v_magic = t_0;
+      }
+      if (v_magic != 727905341920923785) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_header);
+        goto exit;
+      }
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+        uint64_t t_1;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 8)) {
+          t_1 = wuffs_base__peek_u64le__no_bounds_check(iop_a_src);
+          iop_a_src += 8;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
+            *scratch <<= 8;
+            *scratch >>= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
+            if (num_bits_1 == 56) {
+              t_1 = ((uint64_t)(*scratch));
+              break;
+            }
+            num_bits_1 += 8;
+            *scratch |= ((uint64_t)(num_bits_1)) << 56;
+          }
+        }
+        v_magic = t_1;
+      }
+      if (v_magic != 5927942488114331648) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_header);
+        goto exit;
+      }
+      self->private_impl.f_chunk_type_array[0] = 73;
+      self->private_impl.f_chunk_type_array[1] = 72;
+      self->private_impl.f_chunk_type_array[2] = 68;
+      self->private_impl.f_chunk_type_array[3] = 82;
+      wuffs_base__ignore_status(wuffs_crc32__ieee_hasher__initialize(&self->private_data.f_crc32,
+          sizeof (wuffs_crc32__ieee_hasher), WUFFS_VERSION, WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
+      wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__make_slice_u8(self->private_impl.f_chunk_type_array, 4));
+      while (true) {
+        v_mark = ((uint64_t)(iop_a_src - io0_a_src));
+        {
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          wuffs_base__status t_2 = wuffs_png__decoder__decode_ihdr(self, a_src);
+          v_status = t_2;
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+        }
+        if ( ! self->private_impl.f_ignore_checksum) {
+          v_checksum_have = wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_src - io0_a_src)), io0_a_src));
+        }
+        if (wuffs_base__status__is_ok(&v_status)) {
+          goto label__0__break;
+        }
+        status = v_status;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
+      }
+      label__0__break:;
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+        uint32_t t_3;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+          t_3 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+          iop_a_src += 4;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_3 = ((uint32_t)(*scratch & 0xFF));
+            *scratch >>= 8;
+            *scratch <<= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
+            if (num_bits_3 == 24) {
+              t_3 = ((uint32_t)(*scratch >> 32));
+              break;
+            }
+            num_bits_3 += 8;
+            *scratch |= ((uint64_t)(num_bits_3));
+          }
+        }
+        v_checksum_want = t_3;
+      }
+      if ( ! self->private_impl.f_ignore_checksum && (v_checksum_have != v_checksum_want)) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_checksum);
+        goto exit;
+      }
+    }
+    while (true) {
+      while (((uint64_t)(io2_a_src - iop_a_src)) < 8) {
+        if (a_src && a_src->meta.closed) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(8);
+      }
+      self->private_impl.f_chunk_length = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+      self->private_impl.f_chunk_type = ((uint32_t)((wuffs_base__peek_u64le__no_bounds_check(iop_a_src) >> 32)));
+      if (self->private_impl.f_chunk_type == 1413563465) {
+        if ( ! self->private_impl.f_seen_actl || self->private_impl.f_seen_fctl) {
+          goto label__1__break;
+        }
+        self->private_impl.f_seen_idat = true;
+      } else if (self->private_impl.f_chunk_type == 1413571686) {
+        if (self->private_impl.f_seen_idat && self->private_impl.f_seen_fctl) {
+          goto label__1__break;
+        }
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      iop_a_src += 8;
+      if ( ! self->private_impl.f_ignore_checksum && ((self->private_impl.f_chunk_type & 32) == 0)) {
+        self->private_impl.f_chunk_type_array[0] = ((uint8_t)(((self->private_impl.f_chunk_type >> 0) & 255)));
+        self->private_impl.f_chunk_type_array[1] = ((uint8_t)(((self->private_impl.f_chunk_type >> 8) & 255)));
+        self->private_impl.f_chunk_type_array[2] = ((uint8_t)(((self->private_impl.f_chunk_type >> 16) & 255)));
+        self->private_impl.f_chunk_type_array[3] = ((uint8_t)(((self->private_impl.f_chunk_type >> 24) & 255)));
+        wuffs_base__ignore_status(wuffs_crc32__ieee_hasher__initialize(&self->private_data.f_crc32,
+            sizeof (wuffs_crc32__ieee_hasher), WUFFS_VERSION, WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
+        wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__make_slice_u8(self->private_impl.f_chunk_type_array, 4));
+      }
+      while (true) {
+        v_mark = ((uint64_t)(iop_a_src - io0_a_src));
+        {
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          wuffs_base__status t_4 = wuffs_png__decoder__decode_other_chunk(self, a_src);
+          v_status = t_4;
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+        }
+        if ( ! self->private_impl.f_ignore_checksum && ((self->private_impl.f_chunk_type & 32) == 0)) {
+          v_checksum_have = wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__io__since(v_mark, ((uint64_t)(iop_a_src - io0_a_src)), io0_a_src));
+        }
+        if (wuffs_base__status__is_ok(&v_status)) {
+          goto label__2__break;
+        }
+        status = v_status;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(9);
+      }
+      label__2__break:;
+      if (self->private_impl.f_metadata_fourcc != 0) {
+        self->private_impl.f_call_sequence = 1;
+        status = wuffs_base__make_status(wuffs_base__note__metadata_reported);
+        goto ok;
+      }
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
+        uint32_t t_5;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+          t_5 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+          iop_a_src += 4;
+        } else {
+          self->private_data.s_decode_image_config[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_image_config[0].scratch;
+            uint32_t num_bits_5 = ((uint32_t)(*scratch & 0xFF));
+            *scratch >>= 8;
+            *scratch <<= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_5);
+            if (num_bits_5 == 24) {
+              t_5 = ((uint32_t)(*scratch >> 32));
+              break;
+            }
+            num_bits_5 += 8;
+            *scratch |= ((uint64_t)(num_bits_5));
+          }
+        }
+        v_checksum_want = t_5;
+      }
+      if ( ! self->private_impl.f_ignore_checksum && ((self->private_impl.f_chunk_type & 32) == 0) && (v_checksum_have != v_checksum_want)) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_checksum);
+        goto exit;
+      }
+    }
+    label__1__break:;
+    if ((self->private_impl.f_color_type == 3) &&  ! self->private_impl.f_seen_plte) {
+      status = wuffs_base__make_status(wuffs_png__error__missing_palette);
+      goto exit;
+    }
+    self->private_impl.f_frame_config_io_position = wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)));
+    self->private_impl.f_first_config_io_position = self->private_impl.f_frame_config_io_position;
+    if (a_dst != NULL) {
+      wuffs_base__image_config__set(
+          a_dst,
+          self->private_impl.f_dst_pixfmt,
+          0,
+          self->private_impl.f_width,
+          self->private_impl.f_height,
+          self->private_impl.f_first_config_io_position,
+          ((self->private_impl.f_color_type <= 3) &&  ! self->private_impl.f_seen_trns));
+    }
+    if ( ! self->private_impl.f_seen_actl) {
+      self->private_impl.f_num_animation_frames_value = 1;
+      self->private_impl.f_first_rect_x0 = 0;
+      self->private_impl.f_first_rect_y0 = 0;
+      self->private_impl.f_first_rect_x1 = self->private_impl.f_width;
+      self->private_impl.f_first_rect_y1 = self->private_impl.f_height;
+      self->private_impl.f_first_duration = 0;
+      self->private_impl.f_first_disposal = 0;
+      self->private_impl.f_first_overwrite_instead_of_blend = false;
+    }
+    self->private_impl.f_call_sequence = 3;
+
+    ok:
+    self->private_impl.p_decode_image_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_image_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+  self->private_data.s_decode_image_config[0].v_checksum_have = v_checksum_have;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func png.decoder.decode_ihdr
+
+static wuffs_base__status
+wuffs_png__decoder__decode_ihdr(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_a32 = 0;
+  uint8_t v_a8 = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_ihdr[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_0 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_ihdr[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_ihdr[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+          if (num_bits_0 == 24) {
+            t_0 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0));
+        }
+      }
+      v_a32 = t_0;
+    }
+    if ((v_a32 == 0) || (v_a32 >= 2147483648)) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_header);
+      goto exit;
+    } else if (v_a32 >= 16777216) {
+      status = wuffs_base__make_status(wuffs_png__error__unsupported_png_file);
+      goto exit;
+    }
+    self->private_impl.f_width = v_a32;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint32_t t_1;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_1 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_ihdr[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_ihdr[0].scratch;
+          uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
+          if (num_bits_1 == 24) {
+            t_1 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_1 += 8;
+          *scratch |= ((uint64_t)(num_bits_1));
+        }
+      }
+      v_a32 = t_1;
+    }
+    if ((v_a32 == 0) || (v_a32 >= 2147483648)) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_header);
+      goto exit;
+    } else if (v_a32 >= 16777216) {
+      status = wuffs_base__make_status(wuffs_png__error__unsupported_png_file);
+      goto exit;
+    }
+    self->private_impl.f_height = v_a32;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_2 = *iop_a_src++;
+      v_a8 = t_2;
+    }
+    if (v_a8 > 16) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_header);
+      goto exit;
+    }
+    self->private_impl.f_depth = v_a8;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_3 = *iop_a_src++;
+      v_a8 = t_3;
+    }
+    if ((v_a8 == 1) || (v_a8 == 5) || (v_a8 > 6)) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_header);
+      goto exit;
+    }
+    self->private_impl.f_color_type = v_a8;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_4 = *iop_a_src++;
+      v_a8 = t_4;
+    }
+    if (v_a8 != 0) {
+      status = wuffs_base__make_status(wuffs_png__error__unsupported_png_compression_method);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_5 = *iop_a_src++;
+      v_a8 = t_5;
+    }
+    if (v_a8 != 0) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_header);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_6 = *iop_a_src++;
+      v_a8 = t_6;
+    }
+    if (v_a8 == 0) {
+      self->private_impl.f_interlace_pass = 0;
+    } else if (v_a8 == 1) {
+      self->private_impl.f_interlace_pass = 1;
+      self->private_impl.choosy_filter_and_swizzle = (
+          &wuffs_png__decoder__filter_and_swizzle_tricky);
+    } else {
+      status = wuffs_base__make_status(wuffs_png__error__bad_header);
+      goto exit;
+    }
+    self->private_impl.f_filter_distance = 0;
+    wuffs_png__decoder__assign_filter_distance(self);
+    if (self->private_impl.f_filter_distance == 0) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_header);
+      goto exit;
+    }
+    self->private_impl.f_overall_workbuf_length = (((uint64_t)(self->private_impl.f_height)) * (1 + wuffs_png__decoder__calculate_bytes_per_row(self, self->private_impl.f_width)));
+    wuffs_png__decoder__choose_filter_implementations(self);
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_ihdr[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_ihdr[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.assign_filter_distance
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__assign_filter_distance(
+    wuffs_png__decoder* self) {
+  if (self->private_impl.f_depth < 8) {
+    if ((self->private_impl.f_depth != 1) && (self->private_impl.f_depth != 2) && (self->private_impl.f_depth != 4)) {
+      return wuffs_base__make_empty_struct();
+    } else if (self->private_impl.f_color_type == 0) {
+      self->private_impl.f_dst_pixfmt = 536870920;
+      self->private_impl.f_src_pixfmt = 536870920;
+    } else if (self->private_impl.f_color_type == 3) {
+      self->private_impl.f_dst_pixfmt = 2198077448;
+      self->private_impl.f_src_pixfmt = 2198077448;
+    } else {
+      return wuffs_base__make_empty_struct();
+    }
+    self->private_impl.f_filter_distance = 1;
+    self->private_impl.choosy_filter_and_swizzle = (
+        &wuffs_png__decoder__filter_and_swizzle_tricky);
+  } else if (self->private_impl.f_color_type == 0) {
+    if (self->private_impl.f_depth == 8) {
+      self->private_impl.f_dst_pixfmt = 536870920;
+      self->private_impl.f_src_pixfmt = 536870920;
+      self->private_impl.f_filter_distance = 1;
+    } else if (self->private_impl.f_depth == 16) {
+      self->private_impl.f_dst_pixfmt = 536870923;
+      self->private_impl.f_src_pixfmt = 537919499;
+      self->private_impl.f_filter_distance = 2;
+    }
+  } else if (self->private_impl.f_color_type == 2) {
+    if (self->private_impl.f_depth == 8) {
+      self->private_impl.f_dst_pixfmt = 2147485832;
+      self->private_impl.f_src_pixfmt = 2684356744;
+      self->private_impl.f_filter_distance = 3;
+    } else if (self->private_impl.f_depth == 16) {
+      self->private_impl.f_dst_pixfmt = 2164308923;
+      self->private_impl.f_src_pixfmt = 2164308923;
+      self->private_impl.f_filter_distance = 6;
+      self->private_impl.choosy_filter_and_swizzle = (
+          &wuffs_png__decoder__filter_and_swizzle_tricky);
+    }
+  } else if (self->private_impl.f_color_type == 3) {
+    if (self->private_impl.f_depth == 8) {
+      self->private_impl.f_dst_pixfmt = 2198077448;
+      self->private_impl.f_src_pixfmt = 2198077448;
+      self->private_impl.f_filter_distance = 1;
+    }
+  } else if (self->private_impl.f_color_type == 4) {
+    if (self->private_impl.f_depth == 8) {
+      self->private_impl.f_dst_pixfmt = 2164295816;
+      self->private_impl.f_src_pixfmt = 2164295816;
+      self->private_impl.f_filter_distance = 2;
+      self->private_impl.choosy_filter_and_swizzle = (
+          &wuffs_png__decoder__filter_and_swizzle_tricky);
+    } else if (self->private_impl.f_depth == 16) {
+      self->private_impl.f_dst_pixfmt = 2164308923;
+      self->private_impl.f_src_pixfmt = 2164308923;
+      self->private_impl.f_filter_distance = 4;
+      self->private_impl.choosy_filter_and_swizzle = (
+          &wuffs_png__decoder__filter_and_swizzle_tricky);
+    }
+  } else if (self->private_impl.f_color_type == 6) {
+    if (self->private_impl.f_depth == 8) {
+      self->private_impl.f_dst_pixfmt = 2164295816;
+      self->private_impl.f_src_pixfmt = 2701166728;
+      self->private_impl.f_filter_distance = 4;
+    } else if (self->private_impl.f_depth == 16) {
+      self->private_impl.f_dst_pixfmt = 2164308923;
+      self->private_impl.f_src_pixfmt = 2164308923;
+      self->private_impl.f_filter_distance = 8;
+      self->private_impl.choosy_filter_and_swizzle = (
+          &wuffs_png__decoder__filter_and_swizzle_tricky);
+    }
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.calculate_bytes_per_row
+
+static uint64_t
+wuffs_png__decoder__calculate_bytes_per_row(
+    const wuffs_png__decoder* self,
+    uint32_t a_width) {
+  uint64_t v_bytes_per_channel = 0;
+
+  if (self->private_impl.f_depth == 1) {
+    return ((uint64_t)(((a_width + 7) / 8)));
+  } else if (self->private_impl.f_depth == 2) {
+    return ((uint64_t)(((a_width + 3) / 4)));
+  } else if (self->private_impl.f_depth == 4) {
+    return ((uint64_t)(((a_width + 1) / 2)));
+  }
+  v_bytes_per_channel = ((uint64_t)((self->private_impl.f_depth >> 3)));
+  return (((uint64_t)(a_width)) * v_bytes_per_channel * ((uint64_t)(WUFFS_PNG__NUM_CHANNELS[self->private_impl.f_color_type])));
+}
+
+// -------- func png.decoder.choose_filter_implementations
+
+static wuffs_base__empty_struct
+wuffs_png__decoder__choose_filter_implementations(
+    wuffs_png__decoder* self) {
+  if (self->private_impl.f_filter_distance == 3) {
+    self->private_impl.choosy_filter_1 = (
+        &wuffs_png__decoder__filter_1_distance_3_fallback);
+    self->private_impl.choosy_filter_3 = (
+        &wuffs_png__decoder__filter_3_distance_3_fallback);
+    self->private_impl.choosy_filter_4 = (
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+        wuffs_base__cpu_arch__have_arm_neon() ? &wuffs_png__decoder__filter_4_distance_3_arm_neon :
+#endif
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_png__decoder__filter_4_distance_3_x86_sse42 :
+#endif
+        &wuffs_png__decoder__filter_4_distance_3_fallback);
+  } else if (self->private_impl.f_filter_distance == 4) {
+    self->private_impl.choosy_filter_1 = (
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+        wuffs_base__cpu_arch__have_arm_neon() ? &wuffs_png__decoder__filter_1_distance_4_arm_neon :
+#endif
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_png__decoder__filter_1_distance_4_x86_sse42 :
+#endif
+        &wuffs_png__decoder__filter_1_distance_4_fallback);
+    self->private_impl.choosy_filter_3 = (
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+        wuffs_base__cpu_arch__have_arm_neon() ? &wuffs_png__decoder__filter_3_distance_4_arm_neon :
+#endif
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_png__decoder__filter_3_distance_4_x86_sse42 :
+#endif
+        &wuffs_png__decoder__filter_3_distance_4_fallback);
+    self->private_impl.choosy_filter_4 = (
+#if defined(WUFFS_BASE__CPU_ARCH__ARM_NEON)
+        wuffs_base__cpu_arch__have_arm_neon() ? &wuffs_png__decoder__filter_4_distance_4_arm_neon :
+#endif
+#if defined(WUFFS_BASE__CPU_ARCH__X86_FAMILY)
+        wuffs_base__cpu_arch__have_x86_sse42() ? &wuffs_png__decoder__filter_4_distance_4_x86_sse42 :
+#endif
+        &wuffs_png__decoder__filter_4_distance_4_fallback);
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.decode_other_chunk
+
+static wuffs_base__status
+wuffs_png__decoder__decode_other_chunk(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_other_chunk[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_chunk_type == 1163152464) {
+      if (self->private_impl.f_seen_plte || (self->private_impl.f_color_type != 3)) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_png__decoder__decode_plte(self, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+      self->private_impl.f_seen_plte = true;
+    } else if ((self->private_impl.f_chunk_type & 32) == 0) {
+      if (self->private_impl.f_chunk_type != 1413563465) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+    } else if (self->private_impl.f_chunk_type == 1280598881) {
+      if (self->private_impl.f_seen_actl) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      status = wuffs_png__decoder__decode_actl(self, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+      self->private_impl.f_seen_actl = true;
+    } else if (self->private_impl.f_chunk_type == 1297238115) {
+      if (self->private_impl.f_report_metadata_chrm) {
+        if (self->private_impl.f_seen_chrm) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+        status = wuffs_png__decoder__decode_chrm(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+        self->private_impl.f_seen_chrm = true;
+      }
+    } else if (self->private_impl.f_chunk_type == 1280598886) {
+      if (self->private_impl.f_seen_fctl) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+      status = wuffs_png__decoder__decode_fctl(self, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+      self->private_impl.f_seen_fctl = true;
+    } else if (self->private_impl.f_chunk_type == 1095582055) {
+      if (self->private_impl.f_report_metadata_gama) {
+        if (self->private_impl.f_seen_gama) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+        status = wuffs_png__decoder__decode_gama(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+        self->private_impl.f_seen_gama = true;
+      }
+    } else if (self->private_impl.f_chunk_type == 1346585449) {
+      if (self->private_impl.f_report_metadata_iccp) {
+        if (self->private_impl.f_seen_iccp) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+        status = wuffs_png__decoder__decode_iccp(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+        self->private_impl.f_seen_iccp = true;
+      }
+    } else if (self->private_impl.f_chunk_type == 1111970419) {
+      if (self->private_impl.f_report_metadata_srgb) {
+        if (self->private_impl.f_seen_srgb) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+        status = wuffs_png__decoder__decode_srgb(self, a_src);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+        self->private_impl.f_seen_srgb = true;
+      }
+    } else if (self->private_impl.f_chunk_type == 1397641844) {
+      if (self->private_impl.f_seen_trns || (self->private_impl.f_color_type > 3) || ((self->private_impl.f_color_type == 3) &&  ! self->private_impl.f_seen_plte)) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+      status = wuffs_png__decoder__decode_trns(self, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+      self->private_impl.f_seen_trns = true;
+    } else if ((self->private_impl.f_chunk_type == 1951945833) || (self->private_impl.f_chunk_type == 1951942004) || (self->private_impl.f_chunk_type == 1951945850)) {
+      if (self->private_impl.f_report_metadata_kvp) {
+        self->private_impl.f_metadata_flavor = 4;
+        self->private_impl.f_metadata_fourcc = 1263947851;
+        self->private_impl.f_metadata_x = 0;
+        self->private_impl.f_metadata_y = 0;
+        self->private_impl.f_metadata_z = 0;
+      }
+    }
+    if (self->private_impl.f_metadata_fourcc == 0) {
+      self->private_data.s_decode_other_chunk[0].scratch = self->private_impl.f_chunk_length;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+      if (self->private_data.s_decode_other_chunk[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_decode_other_chunk[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_decode_other_chunk[0].scratch;
+    }
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_other_chunk[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_other_chunk[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.decode_actl
+
+static wuffs_base__status
+wuffs_png__decoder__decode_actl(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_actl[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_chunk_length != 8) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    } else if (self->private_impl.f_interlace_pass > 0) {
+      status = wuffs_base__make_status(wuffs_png__error__unsupported_png_file);
+      goto exit;
+    }
+    self->private_impl.f_chunk_length = 0;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_0 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_actl[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_actl[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+          if (num_bits_0 == 24) {
+            t_0 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0));
+        }
+      }
+      self->private_impl.f_num_animation_frames_value = t_0;
+    }
+    if (self->private_impl.f_num_animation_frames_value == 0) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint32_t t_1;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_1 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_actl[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_actl[0].scratch;
+          uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
+          if (num_bits_1 == 24) {
+            t_1 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_1 += 8;
+          *scratch |= ((uint64_t)(num_bits_1));
+        }
+      }
+      self->private_impl.f_num_animation_loops_value = t_1;
+    }
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_actl[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_actl[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.decode_chrm
+
+static wuffs_base__status
+wuffs_png__decoder__decode_chrm(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint64_t v_u = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_chrm[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_chunk_length != 32) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+    self->private_impl.f_chunk_length = 0;
+    self->private_impl.f_metadata_flavor = 5;
+    self->private_impl.f_metadata_fourcc = 1128813133;
+    self->private_impl.f_metadata_x = 0;
+    self->private_impl.f_metadata_y = 0;
+    self->private_impl.f_metadata_z = 0;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint64_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_0 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_chrm[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_chrm[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+          if (num_bits_0 == 24) {
+            t_0 = ((uint64_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0));
+        }
+      }
+      v_u = t_0;
+    }
+    self->private_impl.f_metadata_x |= ((16777215 & v_u) << 0);
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint64_t t_1;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_1 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_chrm[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_chrm[0].scratch;
+          uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
+          if (num_bits_1 == 24) {
+            t_1 = ((uint64_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_1 += 8;
+          *scratch |= ((uint64_t)(num_bits_1));
+        }
+      }
+      v_u = t_1;
+    }
+    self->private_impl.f_metadata_x |= ((16777215 & v_u) << 24);
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      uint64_t t_2;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_2 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_chrm[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_chrm[0].scratch;
+          uint32_t num_bits_2 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_2);
+          if (num_bits_2 == 24) {
+            t_2 = ((uint64_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_2 += 8;
+          *scratch |= ((uint64_t)(num_bits_2));
+        }
+      }
+      v_u = t_2;
+    }
+    self->private_impl.f_metadata_x |= ((uint64_t)((16777215 & v_u) << 48));
+    self->private_impl.f_metadata_y |= ((16777215 & v_u) >> 16);
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+      uint64_t t_3;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_3 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_chrm[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_chrm[0].scratch;
+          uint32_t num_bits_3 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
+          if (num_bits_3 == 24) {
+            t_3 = ((uint64_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_3 += 8;
+          *scratch |= ((uint64_t)(num_bits_3));
+        }
+      }
+      v_u = t_3;
+    }
+    self->private_impl.f_metadata_y |= ((16777215 & v_u) << 8);
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+      uint64_t t_4;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_4 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_chrm[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_chrm[0].scratch;
+          uint32_t num_bits_4 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_4);
+          if (num_bits_4 == 24) {
+            t_4 = ((uint64_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_4 += 8;
+          *scratch |= ((uint64_t)(num_bits_4));
+        }
+      }
+      v_u = t_4;
+    }
+    self->private_impl.f_metadata_y |= ((16777215 & v_u) << 32);
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
+      uint64_t t_5;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_5 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_chrm[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(12);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_chrm[0].scratch;
+          uint32_t num_bits_5 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_5);
+          if (num_bits_5 == 24) {
+            t_5 = ((uint64_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_5 += 8;
+          *scratch |= ((uint64_t)(num_bits_5));
+        }
+      }
+      v_u = t_5;
+    }
+    self->private_impl.f_metadata_y |= ((uint64_t)((16777215 & v_u) << 56));
+    self->private_impl.f_metadata_z |= ((16777215 & v_u) >> 8);
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(13);
+      uint64_t t_6;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_6 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_chrm[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_chrm[0].scratch;
+          uint32_t num_bits_6 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_6);
+          if (num_bits_6 == 24) {
+            t_6 = ((uint64_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_6 += 8;
+          *scratch |= ((uint64_t)(num_bits_6));
+        }
+      }
+      v_u = t_6;
+    }
+    self->private_impl.f_metadata_z |= ((16777215 & v_u) << 16);
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(15);
+      uint64_t t_7;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_7 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_chrm[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_chrm[0].scratch;
+          uint32_t num_bits_7 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_7);
+          if (num_bits_7 == 24) {
+            t_7 = ((uint64_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_7 += 8;
+          *scratch |= ((uint64_t)(num_bits_7));
+        }
+      }
+      v_u = t_7;
+    }
+    self->private_impl.f_metadata_z |= ((16777215 & v_u) << 40);
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_chrm[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_chrm[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.decode_fctl
+
+static wuffs_base__status
+wuffs_png__decoder__decode_fctl(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_x0 = 0;
+  uint32_t v_y0 = 0;
+  uint32_t v_x1 = 0;
+  uint32_t v_y1 = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_fctl[0];
+  if (coro_susp_point) {
+    v_x0 = self->private_data.s_decode_fctl[0].v_x0;
+    v_x1 = self->private_data.s_decode_fctl[0].v_x1;
+    v_y1 = self->private_data.s_decode_fctl[0].v_y1;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_chunk_length != 26) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+    self->private_impl.f_chunk_length = 0;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint32_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_0 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_fctl[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_fctl[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+          if (num_bits_0 == 24) {
+            t_0 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0));
+        }
+      }
+      v_x0 = t_0;
+    }
+    if (v_x0 != self->private_impl.f_next_animation_seq_num) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_animation_sequence_number);
+      goto exit;
+    } else if (self->private_impl.f_next_animation_seq_num >= 4294967295) {
+      status = wuffs_base__make_status(wuffs_png__error__unsupported_png_file);
+      goto exit;
+    }
+    self->private_impl.f_next_animation_seq_num += 1;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+      uint32_t t_1;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_1 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_fctl[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_fctl[0].scratch;
+          uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
+          if (num_bits_1 == 24) {
+            t_1 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_1 += 8;
+          *scratch |= ((uint64_t)(num_bits_1));
+        }
+      }
+      v_x1 = t_1;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      uint32_t t_2;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_2 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_fctl[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_fctl[0].scratch;
+          uint32_t num_bits_2 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_2);
+          if (num_bits_2 == 24) {
+            t_2 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_2 += 8;
+          *scratch |= ((uint64_t)(num_bits_2));
+        }
+      }
+      v_y1 = t_2;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+      uint32_t t_3;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_3 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_fctl[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_fctl[0].scratch;
+          uint32_t num_bits_3 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
+          if (num_bits_3 == 24) {
+            t_3 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_3 += 8;
+          *scratch |= ((uint64_t)(num_bits_3));
+        }
+      }
+      v_x0 = t_3;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+      uint32_t t_4;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_4 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_fctl[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_fctl[0].scratch;
+          uint32_t num_bits_4 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_4);
+          if (num_bits_4 == 24) {
+            t_4 = ((uint32_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_4 += 8;
+          *scratch |= ((uint64_t)(num_bits_4));
+        }
+      }
+      v_y0 = t_4;
+    }
+    v_x1 += v_x0;
+    v_y1 += v_y0;
+    if ((v_x0 >= v_x1) ||
+        (v_x0 > self->private_impl.f_width) ||
+        (v_x1 > self->private_impl.f_width) ||
+        (v_y0 >= v_y1) ||
+        (v_y0 > self->private_impl.f_height) ||
+        (v_y1 > self->private_impl.f_height)) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+    self->private_impl.f_frame_rect_x0 = v_x0;
+    self->private_impl.f_frame_rect_y0 = v_y0;
+    self->private_impl.f_frame_rect_x1 = v_x1;
+    self->private_impl.f_frame_rect_y1 = v_y1;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
+      uint32_t t_5;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_5 = ((uint32_t)(wuffs_base__peek_u16be__no_bounds_check(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_fctl[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(12);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_fctl[0].scratch;
+          uint32_t num_bits_5 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_5);
+          if (num_bits_5 == 8) {
+            t_5 = ((uint32_t)(*scratch >> 48));
+            break;
+          }
+          num_bits_5 += 8;
+          *scratch |= ((uint64_t)(num_bits_5));
+        }
+      }
+      v_x0 = t_5;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(13);
+      uint32_t t_6;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+        t_6 = ((uint32_t)(wuffs_base__peek_u16be__no_bounds_check(iop_a_src)));
+        iop_a_src += 2;
+      } else {
+        self->private_data.s_decode_fctl[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_fctl[0].scratch;
+          uint32_t num_bits_6 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_6);
+          if (num_bits_6 == 8) {
+            t_6 = ((uint32_t)(*scratch >> 48));
+            break;
+          }
+          num_bits_6 += 8;
+          *scratch |= ((uint64_t)(num_bits_6));
+        }
+      }
+      v_x1 = t_6;
+    }
+    if (v_x1 <= 0) {
+      self->private_impl.f_frame_duration = (((uint64_t)(v_x0)) * 7056000);
+    } else {
+      self->private_impl.f_frame_duration = ((((uint64_t)(v_x0)) * 705600000) / ((uint64_t)(v_x1)));
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(15);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint32_t t_7 = *iop_a_src++;
+      v_x0 = t_7;
+    }
+    if (v_x0 == 0) {
+      self->private_impl.f_frame_disposal = 0;
+    } else if (v_x0 == 1) {
+      self->private_impl.f_frame_disposal = 1;
+    } else if (v_x0 == 2) {
+      self->private_impl.f_frame_disposal = 2;
+    } else {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(16);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint32_t t_8 = *iop_a_src++;
+      v_x0 = t_8;
+    }
+    if (v_x0 == 0) {
+      self->private_impl.f_frame_overwrite_instead_of_blend = true;
+    } else if (v_x0 == 1) {
+      self->private_impl.f_frame_overwrite_instead_of_blend = false;
+    } else {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+    if (self->private_impl.f_num_decoded_frame_configs_value == 0) {
+      self->private_impl.f_first_rect_x0 = self->private_impl.f_frame_rect_x0;
+      self->private_impl.f_first_rect_y0 = self->private_impl.f_frame_rect_y0;
+      self->private_impl.f_first_rect_x1 = self->private_impl.f_frame_rect_x1;
+      self->private_impl.f_first_rect_y1 = self->private_impl.f_frame_rect_y1;
+      self->private_impl.f_first_duration = self->private_impl.f_frame_duration;
+      self->private_impl.f_first_disposal = self->private_impl.f_frame_disposal;
+      self->private_impl.f_first_overwrite_instead_of_blend = self->private_impl.f_frame_overwrite_instead_of_blend;
+    }
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_fctl[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_fctl[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_fctl[0].v_x0 = v_x0;
+  self->private_data.s_decode_fctl[0].v_x1 = v_x1;
+  self->private_data.s_decode_fctl[0].v_y1 = v_y1;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.decode_gama
+
+static wuffs_base__status
+wuffs_png__decoder__decode_gama(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_gama[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_chunk_length != 4) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+    self->private_impl.f_chunk_length = 0;
+    self->private_impl.f_metadata_flavor = 5;
+    self->private_impl.f_metadata_fourcc = 1195461953;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      uint64_t t_0;
+      if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+        t_0 = ((uint64_t)(wuffs_base__peek_u32be__no_bounds_check(iop_a_src)));
+        iop_a_src += 4;
+      } else {
+        self->private_data.s_decode_gama[0].scratch = 0;
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+        while (true) {
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint64_t* scratch = &self->private_data.s_decode_gama[0].scratch;
+          uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+          *scratch >>= 8;
+          *scratch <<= 8;
+          *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+          if (num_bits_0 == 24) {
+            t_0 = ((uint64_t)(*scratch >> 32));
+            break;
+          }
+          num_bits_0 += 8;
+          *scratch |= ((uint64_t)(num_bits_0));
+        }
+      }
+      self->private_impl.f_metadata_x = t_0;
+    }
+    self->private_impl.f_metadata_y = 0;
+    self->private_impl.f_metadata_z = 0;
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_gama[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_gama[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.decode_iccp
+
+static wuffs_base__status
+wuffs_png__decoder__decode_iccp(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_c = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_iccp[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    while (true) {
+      if (self->private_impl.f_chunk_length <= 0) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      self->private_impl.f_chunk_length -= 1;
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_c = t_0;
+      }
+      if (v_c == 0) {
+        goto label__0__break;
+      }
+    }
+    label__0__break:;
+    if (self->private_impl.f_chunk_length <= 0) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+    self->private_impl.f_chunk_length -= 1;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint8_t t_1 = *iop_a_src++;
+      v_c = t_1;
+    }
+    if (v_c != 0) {
+      status = wuffs_base__make_status(wuffs_png__error__unsupported_png_compression_method);
+      goto exit;
+    }
+    self->private_impl.f_metadata_is_zlib_compressed = true;
+    self->private_impl.f_metadata_flavor = 4;
+    self->private_impl.f_metadata_fourcc = 1229144912;
+    self->private_impl.f_metadata_x = 0;
+    self->private_impl.f_metadata_y = 0;
+    self->private_impl.f_metadata_z = 0;
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_iccp[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_iccp[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.decode_plte
+
+static wuffs_base__status
+wuffs_png__decoder__decode_plte(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_num_entries = 0;
+  uint32_t v_i = 0;
+  uint32_t v_argb = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_plte[0];
+  if (coro_susp_point) {
+    v_num_entries = self->private_data.s_decode_plte[0].v_num_entries;
+    v_i = self->private_data.s_decode_plte[0].v_i;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if ((self->private_impl.f_chunk_length > 768) || ((self->private_impl.f_chunk_length % 3) != 0)) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+    v_num_entries = (((uint32_t)(self->private_impl.f_chunk_length)) / 3);
+    self->private_impl.f_chunk_length = 0;
+    while (v_i < v_num_entries) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        uint32_t t_0;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 3)) {
+          t_0 = ((uint32_t)(wuffs_base__peek_u24be__no_bounds_check(iop_a_src)));
+          iop_a_src += 3;
+        } else {
+          self->private_data.s_decode_plte[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_plte[0].scratch;
+            uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+            *scratch >>= 8;
+            *scratch <<= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+            if (num_bits_0 == 16) {
+              t_0 = ((uint32_t)(*scratch >> 40));
+              break;
+            }
+            num_bits_0 += 8;
+            *scratch |= ((uint64_t)(num_bits_0));
+          }
+        }
+        v_argb = t_0;
+      }
+      v_argb |= 4278190080;
+      self->private_data.f_src_palette[((4 * v_i) + 0)] = ((uint8_t)(((v_argb >> 0) & 255)));
+      self->private_data.f_src_palette[((4 * v_i) + 1)] = ((uint8_t)(((v_argb >> 8) & 255)));
+      self->private_data.f_src_palette[((4 * v_i) + 2)] = ((uint8_t)(((v_argb >> 16) & 255)));
+      self->private_data.f_src_palette[((4 * v_i) + 3)] = ((uint8_t)(((v_argb >> 24) & 255)));
+      v_i += 1;
+    }
+    while (v_i < 256) {
+      self->private_data.f_src_palette[((4 * v_i) + 0)] = 0;
+      self->private_data.f_src_palette[((4 * v_i) + 1)] = 0;
+      self->private_data.f_src_palette[((4 * v_i) + 2)] = 0;
+      self->private_data.f_src_palette[((4 * v_i) + 3)] = 255;
+      v_i += 1;
+    }
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_plte[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_plte[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_plte[0].v_num_entries = v_num_entries;
+  self->private_data.s_decode_plte[0].v_i = v_i;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.decode_srgb
+
+static wuffs_base__status
+wuffs_png__decoder__decode_srgb(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_srgb[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_chunk_length != 1) {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+    self->private_impl.f_chunk_length = 0;
+    self->private_impl.f_metadata_flavor = 5;
+    self->private_impl.f_metadata_fourcc = 1397901122;
+    {
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      uint64_t t_0 = *iop_a_src++;
+      self->private_impl.f_metadata_x = t_0;
+    }
+    self->private_impl.f_metadata_y = 0;
+    self->private_impl.f_metadata_z = 0;
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_srgb[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_srgb[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.decode_trns
+
+static wuffs_base__status
+wuffs_png__decoder__decode_trns(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_i = 0;
+  uint32_t v_n = 0;
+  uint64_t v_u = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_trns[0];
+  if (coro_susp_point) {
+    v_i = self->private_data.s_decode_trns[0].v_i;
+    v_n = self->private_data.s_decode_trns[0].v_n;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_color_type == 0) {
+      self->private_impl.choosy_filter_and_swizzle = (
+          &wuffs_png__decoder__filter_and_swizzle_tricky);
+      if (self->private_impl.f_depth <= 8) {
+        self->private_impl.f_dst_pixfmt = 2164295816;
+        self->private_impl.f_src_pixfmt = 2164295816;
+      } else {
+        self->private_impl.f_dst_pixfmt = 2164308923;
+        self->private_impl.f_src_pixfmt = 2164308923;
+      }
+      if (self->private_impl.f_chunk_length != 2) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      self->private_impl.f_chunk_length = 0;
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        uint64_t t_0;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 2)) {
+          t_0 = ((uint64_t)(wuffs_base__peek_u16be__no_bounds_check(iop_a_src)));
+          iop_a_src += 2;
+        } else {
+          self->private_data.s_decode_trns[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_trns[0].scratch;
+            uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+            *scratch >>= 8;
+            *scratch <<= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+            if (num_bits_0 == 8) {
+              t_0 = ((uint64_t)(*scratch >> 48));
+              break;
+            }
+            num_bits_0 += 8;
+            *scratch |= ((uint64_t)(num_bits_0));
+          }
+        }
+        v_u = t_0;
+      }
+      if (self->private_impl.f_depth <= 1) {
+        self->private_impl.f_remap_transparency = (((v_u & 1) * 16777215) | 4278190080);
+      } else if (self->private_impl.f_depth <= 2) {
+        self->private_impl.f_remap_transparency = (((v_u & 3) * 5592405) | 4278190080);
+      } else if (self->private_impl.f_depth <= 4) {
+        self->private_impl.f_remap_transparency = (((v_u & 15) * 1118481) | 4278190080);
+      } else if (self->private_impl.f_depth <= 8) {
+        self->private_impl.f_remap_transparency = (((v_u & 255) * 65793) | 4278190080);
+      } else {
+        self->private_impl.f_remap_transparency = ((v_u * 4295032833) | 18446462598732840960u);
+      }
+    } else if (self->private_impl.f_color_type == 2) {
+      self->private_impl.choosy_filter_and_swizzle = (
+          &wuffs_png__decoder__filter_and_swizzle_tricky);
+      if (self->private_impl.f_depth <= 8) {
+        self->private_impl.f_dst_pixfmt = 2164295816;
+        self->private_impl.f_src_pixfmt = 2164295816;
+      } else {
+        self->private_impl.f_dst_pixfmt = 2164308923;
+        self->private_impl.f_src_pixfmt = 2164308923;
+      }
+      if (self->private_impl.f_chunk_length != 6) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      self->private_impl.f_chunk_length = 0;
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+        uint64_t t_1;
+        if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 6)) {
+          t_1 = ((uint64_t)(wuffs_base__peek_u48be__no_bounds_check(iop_a_src)));
+          iop_a_src += 6;
+        } else {
+          self->private_data.s_decode_trns[0].scratch = 0;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+          while (true) {
+            if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              goto suspend;
+            }
+            uint64_t* scratch = &self->private_data.s_decode_trns[0].scratch;
+            uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
+            *scratch >>= 8;
+            *scratch <<= 8;
+            *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
+            if (num_bits_1 == 40) {
+              t_1 = ((uint64_t)(*scratch >> 16));
+              break;
+            }
+            num_bits_1 += 8;
+            *scratch |= ((uint64_t)(num_bits_1));
+          }
+        }
+        v_u = t_1;
+      }
+      if (self->private_impl.f_depth <= 8) {
+        self->private_impl.f_remap_transparency = ((255 & (v_u >> 0)) |
+            (65280 & (v_u >> 8)) |
+            (16711680 & (v_u >> 16)) |
+            4278190080);
+      } else {
+        self->private_impl.f_remap_transparency = (v_u | 18446462598732840960u);
+      }
+    } else if (self->private_impl.f_color_type == 3) {
+      self->private_impl.f_dst_pixfmt = 2164523016;
+      self->private_impl.f_src_pixfmt = 2164523016;
+      if (self->private_impl.f_chunk_length > 256) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      v_n = ((uint32_t)(self->private_impl.f_chunk_length));
+      self->private_impl.f_chunk_length = 0;
+      while (v_i < v_n) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint8_t t_2 = *iop_a_src++;
+          self->private_data.f_src_palette[((4 * v_i) + 3)] = t_2;
+        }
+        v_i += 1;
+      }
+    } else {
+      status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+      goto exit;
+    }
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_trns[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_trns[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_data.s_decode_trns[0].v_i = v_i;
+  self->private_data.s_decode_trns[0].v_n = v_n;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.decode_frame_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_png__decoder__decode_frame_config(
+    wuffs_png__decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 2)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence == 255) {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    } else if (self->private_impl.f_call_sequence < 3) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_png__decoder__decode_image_config(self, NULL, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+    } else if (self->private_impl.f_call_sequence == 3) {
+      if (self->private_impl.f_frame_config_io_position != wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)))) {
+        status = wuffs_base__make_status(wuffs_base__error__bad_restart);
+        goto exit;
+      }
+    } else if (self->private_impl.f_call_sequence == 4) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+      status = wuffs_png__decoder__skip_frame(self, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+      if (self->private_impl.f_call_sequence == 255) {
+        status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+        goto ok;
+      }
+    }
+    if (self->private_impl.f_num_decoded_frame_configs_value == 0) {
+      self->private_impl.f_frame_rect_x0 = self->private_impl.f_first_rect_x0;
+      self->private_impl.f_frame_rect_y0 = self->private_impl.f_first_rect_y0;
+      self->private_impl.f_frame_rect_x1 = self->private_impl.f_first_rect_x1;
+      self->private_impl.f_frame_rect_y1 = self->private_impl.f_first_rect_y1;
+      self->private_impl.f_frame_config_io_position = self->private_impl.f_first_config_io_position;
+      self->private_impl.f_frame_duration = self->private_impl.f_first_duration;
+      self->private_impl.f_frame_disposal = self->private_impl.f_first_disposal;
+      self->private_impl.f_frame_overwrite_instead_of_blend = self->private_impl.f_first_overwrite_instead_of_blend;
+    } else {
+      while (true) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          uint32_t t_0;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_0 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_decode_frame_config[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_frame_config[0].scratch;
+              uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+              if (num_bits_0 == 24) {
+                t_0 = ((uint32_t)(*scratch >> 32));
+                break;
+              }
+              num_bits_0 += 8;
+              *scratch |= ((uint64_t)(num_bits_0));
+            }
+          }
+          self->private_impl.f_chunk_length = t_0;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+          uint32_t t_1;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_1 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_decode_frame_config[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_frame_config[0].scratch;
+              uint32_t num_bits_1 = ((uint32_t)(*scratch >> 56));
+              *scratch <<= 8;
+              *scratch >>= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_1;
+              if (num_bits_1 == 24) {
+                t_1 = ((uint32_t)(*scratch));
+                break;
+              }
+              num_bits_1 += 8;
+              *scratch |= ((uint64_t)(num_bits_1)) << 56;
+            }
+          }
+          self->private_impl.f_chunk_type = t_1;
+        }
+        if (self->private_impl.f_chunk_type == 1413571686) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        } else if (self->private_impl.f_chunk_type == 1280598886) {
+          self->private_impl.f_frame_config_io_position = ((uint64_t)(wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src))) - 8));
+          if (a_src) {
+            a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+          }
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+          status = wuffs_png__decoder__decode_fctl(self, a_src);
+          if (a_src) {
+            iop_a_src = a_src->data.ptr + a_src->meta.ri;
+          }
+          if (status.repr) {
+            goto suspend;
+          }
+          self->private_data.s_decode_frame_config[0].scratch = 4;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+          if (self->private_data.s_decode_frame_config[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+            self->private_data.s_decode_frame_config[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+            iop_a_src = io2_a_src;
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          iop_a_src += self->private_data.s_decode_frame_config[0].scratch;
+          goto label__0__break;
+        }
+        self->private_data.s_decode_frame_config[0].scratch = (((uint64_t)(self->private_impl.f_chunk_length)) + 4);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+        if (self->private_data.s_decode_frame_config[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+          self->private_data.s_decode_frame_config[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+          iop_a_src = io2_a_src;
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        iop_a_src += self->private_data.s_decode_frame_config[0].scratch;
+        self->private_impl.f_chunk_length = 0;
+      }
+      label__0__break:;
+    }
+    if (a_dst != NULL) {
+      wuffs_base__frame_config__set(
+          a_dst,
+          wuffs_base__utility__make_rect_ie_u32(
+          self->private_impl.f_frame_rect_x0,
+          self->private_impl.f_frame_rect_y0,
+          self->private_impl.f_frame_rect_x1,
+          self->private_impl.f_frame_rect_y1),
+          ((wuffs_base__flicks)(self->private_impl.f_frame_duration)),
+          ((uint64_t)(self->private_impl.f_num_decoded_frame_configs_value)),
+          self->private_impl.f_frame_config_io_position,
+          self->private_impl.f_frame_disposal,
+          ((self->private_impl.f_color_type <= 3) &&  ! self->private_impl.f_seen_trns),
+          self->private_impl.f_frame_overwrite_instead_of_blend,
+          0);
+    }
+    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_num_decoded_frame_configs_value, 1);
+    self->private_impl.f_call_sequence = 4;
+
+    ok:
+    self->private_impl.p_decode_frame_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_frame_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 2 : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func png.decoder.skip_frame
+
+static wuffs_base__status
+wuffs_png__decoder__skip_frame(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_seq_num = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_skip_frame[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.f_chunk_type_array[0] = 0;
+    self->private_impl.f_chunk_type_array[1] = 0;
+    self->private_impl.f_chunk_type_array[2] = 0;
+    self->private_impl.f_chunk_type_array[3] = 0;
+    label__0__continue:;
+    while (true) {
+      while (((uint64_t)(io2_a_src - iop_a_src)) < 8) {
+        if (a_src && a_src->meta.closed) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+      }
+      self->private_impl.f_chunk_length = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+      self->private_impl.f_chunk_type = ((uint32_t)((wuffs_base__peek_u64le__no_bounds_check(iop_a_src) >> 32)));
+      if (self->private_impl.f_chunk_type == 1413563465) {
+        if (self->private_impl.f_chunk_type_array[0] == 102) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        self->private_impl.f_chunk_type_array[0] = 73;
+        self->private_impl.f_chunk_type_array[1] = 68;
+        self->private_impl.f_chunk_type_array[2] = 65;
+        self->private_impl.f_chunk_type_array[3] = 84;
+      } else if (self->private_impl.f_chunk_type == 1413571686) {
+        if (self->private_impl.f_chunk_type_array[0] == 73) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        self->private_impl.f_chunk_type_array[0] = 102;
+        self->private_impl.f_chunk_type_array[1] = 100;
+        self->private_impl.f_chunk_type_array[2] = 65;
+        self->private_impl.f_chunk_type_array[3] = 84;
+        if (self->private_impl.f_chunk_length < 4) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        self->private_impl.f_chunk_length -= 4;
+        iop_a_src += 8;
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          uint32_t t_0;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_0 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_skip_frame[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_skip_frame[0].scratch;
+              uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+              if (num_bits_0 == 24) {
+                t_0 = ((uint32_t)(*scratch >> 32));
+                break;
+              }
+              num_bits_0 += 8;
+              *scratch |= ((uint64_t)(num_bits_0));
+            }
+          }
+          v_seq_num = t_0;
+        }
+        if (v_seq_num != self->private_impl.f_next_animation_seq_num) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_animation_sequence_number);
+          goto exit;
+        } else if (self->private_impl.f_next_animation_seq_num >= 4294967295) {
+          status = wuffs_base__make_status(wuffs_png__error__unsupported_png_file);
+          goto exit;
+        }
+        self->private_impl.f_next_animation_seq_num += 1;
+        self->private_data.s_skip_frame[0].scratch = (((uint64_t)(self->private_impl.f_chunk_length)) + 4);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+        if (self->private_data.s_skip_frame[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+          self->private_data.s_skip_frame[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+          iop_a_src = io2_a_src;
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        iop_a_src += self->private_data.s_skip_frame[0].scratch;
+        self->private_impl.f_chunk_length = 0;
+        goto label__0__continue;
+      } else if (self->private_impl.f_chunk_type_array[0] != 0) {
+        goto label__0__break;
+      } else if (self->private_impl.f_chunk_type == 1280598886) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      self->private_data.s_skip_frame[0].scratch = (((uint64_t)(self->private_impl.f_chunk_length)) + 12);
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      if (self->private_data.s_skip_frame[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_skip_frame[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_skip_frame[0].scratch;
+      self->private_impl.f_chunk_length = 0;
+    }
+    label__0__break:;
+    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_num_decoded_frames_value, 1);
+    if (self->private_impl.f_num_decoded_frames_value < self->private_impl.f_num_animation_frames_value) {
+      self->private_impl.f_call_sequence = 5;
+    } else {
+      self->private_impl.f_call_sequence = 255;
+    }
+
+    ok:
+    self->private_impl.p_skip_frame[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_skip_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.decode_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_png__decoder__decode_frame(
+    wuffs_png__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 3)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint32_t v_seq_num = 0;
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+  uint32_t v_pass_width = 0;
+  uint32_t v_pass_height = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence == 255) {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    } else if (self->private_impl.f_call_sequence != 4) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_png__decoder__decode_frame_config(self, NULL, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+    }
+    while (true) {
+      while (((uint64_t)(io2_a_src - iop_a_src)) < 8) {
+        if (a_src && a_src->meta.closed) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+      }
+      self->private_impl.f_chunk_length = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+      self->private_impl.f_chunk_type = ((uint32_t)((wuffs_base__peek_u64le__no_bounds_check(iop_a_src) >> 32)));
+      if (self->private_impl.f_chunk_type == 1413563465) {
+        self->private_impl.f_chunk_type_array[0] = 73;
+        self->private_impl.f_chunk_type_array[1] = 68;
+        self->private_impl.f_chunk_type_array[2] = 65;
+        self->private_impl.f_chunk_type_array[3] = 84;
+        iop_a_src += 8;
+        if ( ! self->private_impl.f_ignore_checksum) {
+          wuffs_base__ignore_status(wuffs_crc32__ieee_hasher__initialize(&self->private_data.f_crc32,
+              sizeof (wuffs_crc32__ieee_hasher), WUFFS_VERSION, WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
+          wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__make_slice_u8(self->private_impl.f_chunk_type_array, 4));
+        }
+        goto label__0__break;
+      } else if (self->private_impl.f_chunk_type == 1413571686) {
+        self->private_impl.f_chunk_type_array[0] = 102;
+        self->private_impl.f_chunk_type_array[1] = 100;
+        self->private_impl.f_chunk_type_array[2] = 65;
+        self->private_impl.f_chunk_type_array[3] = 84;
+        if (self->private_impl.f_chunk_length < 4) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        self->private_impl.f_chunk_length -= 4;
+        iop_a_src += 8;
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          uint32_t t_0;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_0 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_decode_frame[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_frame[0].scratch;
+              uint32_t num_bits_0 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_0);
+              if (num_bits_0 == 24) {
+                t_0 = ((uint32_t)(*scratch >> 32));
+                break;
+              }
+              num_bits_0 += 8;
+              *scratch |= ((uint64_t)(num_bits_0));
+            }
+          }
+          v_seq_num = t_0;
+        }
+        if (v_seq_num != self->private_impl.f_next_animation_seq_num) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_animation_sequence_number);
+          goto exit;
+        } else if (self->private_impl.f_next_animation_seq_num >= 4294967295) {
+          status = wuffs_base__make_status(wuffs_png__error__unsupported_png_file);
+          goto exit;
+        }
+        self->private_impl.f_next_animation_seq_num += 1;
+        goto label__0__break;
+      } else if (self->private_impl.f_chunk_type == 1280598886) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      self->private_data.s_decode_frame[0].scratch = (((uint64_t)(self->private_impl.f_chunk_length)) + 12);
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+      if (self->private_data.s_decode_frame[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_decode_frame[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_decode_frame[0].scratch;
+      self->private_impl.f_chunk_length = 0;
+    }
+    label__0__break:;
+    if (self->private_impl.f_zlib_is_dirty) {
+      wuffs_base__ignore_status(wuffs_zlib__decoder__initialize(&self->private_data.f_zlib,
+          sizeof (wuffs_zlib__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
+      if (self->private_impl.f_ignore_checksum) {
+        wuffs_zlib__decoder__set_quirk_enabled(&self->private_data.f_zlib, 1, true);
+      }
+    }
+    self->private_impl.f_zlib_is_dirty = true;
+    v_status = wuffs_base__pixel_swizzler__prepare(&self->private_impl.f_swizzler,
+        wuffs_base__pixel_buffer__pixel_format(a_dst),
+        wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024)),
+        wuffs_base__utility__make_pixel_format(self->private_impl.f_src_pixfmt),
+        wuffs_base__make_slice_u8(self->private_data.f_src_palette, 1024),
+        a_blend);
+    if ( ! wuffs_base__status__is_ok(&v_status)) {
+      status = v_status;
+      if (wuffs_base__status__is_error(&status)) {
+        goto exit;
+      } else if (wuffs_base__status__is_suspension(&status)) {
+        status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+        goto exit;
+      }
+      goto ok;
+    }
+    self->private_impl.f_workbuf_hist_pos_base = 0;
+    while (true) {
+      if (self->private_impl.f_chunk_type_array[0] == 73) {
+        v_pass_width = (16777215 & ((((uint32_t)(WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][1])) + self->private_impl.f_width) >> WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][0]));
+        v_pass_height = (16777215 & ((((uint32_t)(WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][4])) + self->private_impl.f_height) >> WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][3]));
+      } else {
+        v_pass_width = (16777215 & ((uint32_t)(self->private_impl.f_frame_rect_x1 - self->private_impl.f_frame_rect_x0)));
+        v_pass_height = (16777215 & ((uint32_t)(self->private_impl.f_frame_rect_y1 - self->private_impl.f_frame_rect_y0)));
+      }
+      if ((v_pass_width > 0) && (v_pass_height > 0)) {
+        self->private_impl.f_pass_bytes_per_row = wuffs_png__decoder__calculate_bytes_per_row(self, v_pass_width);
+        self->private_impl.f_pass_workbuf_length = (((uint64_t)(v_pass_height)) * (1 + self->private_impl.f_pass_bytes_per_row));
+        if (a_src) {
+          a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+        }
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+        status = wuffs_png__decoder__decode_pass(self, a_src, a_workbuf);
+        if (a_src) {
+          iop_a_src = a_src->data.ptr + a_src->meta.ri;
+        }
+        if (status.repr) {
+          goto suspend;
+        }
+        v_status = wuffs_png__decoder__filter_and_swizzle(self, a_dst, a_workbuf);
+        if ( ! wuffs_base__status__is_ok(&v_status)) {
+          status = v_status;
+          if (wuffs_base__status__is_error(&status)) {
+            goto exit;
+          } else if (wuffs_base__status__is_suspension(&status)) {
+            status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+            goto exit;
+          }
+          goto ok;
+        }
+        self->private_impl.f_workbuf_hist_pos_base += self->private_impl.f_pass_workbuf_length;
+      }
+      if ((self->private_impl.f_interlace_pass == 0) || (self->private_impl.f_interlace_pass >= 7)) {
+        goto label__1__break;
+      }
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wconversion"
+#endif
+      self->private_impl.f_interlace_pass += 1;
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+    }
+    label__1__break:;
+    wuffs_base__u32__sat_add_indirect(&self->private_impl.f_num_decoded_frames_value, 1);
+    if (self->private_impl.f_num_decoded_frames_value < self->private_impl.f_num_animation_frames_value) {
+      self->private_impl.f_call_sequence = 5;
+    } else {
+      self->private_impl.f_call_sequence = 255;
+    }
+
+    ok:
+    self->private_impl.p_decode_frame[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 3 : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func png.decoder.decode_pass
+
+static wuffs_base__status
+wuffs_png__decoder__decode_pass(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__slice_u8 a_workbuf) {
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  wuffs_base__io_buffer u_w = wuffs_base__empty_io_buffer();
+  wuffs_base__io_buffer* v_w = &u_w;
+  uint8_t* iop_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io0_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint64_t v_w_mark = 0;
+  uint64_t v_r_mark = 0;
+  wuffs_base__status v_zlib_status = wuffs_base__make_status(NULL);
+  uint32_t v_checksum_have = 0;
+  uint32_t v_checksum_want = 0;
+  uint32_t v_seq_num = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_pass[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    self->private_impl.f_workbuf_wi = 0;
+    label__0__continue:;
+    while (true) {
+      if ((self->private_impl.f_workbuf_wi > self->private_impl.f_pass_workbuf_length) || (self->private_impl.f_pass_workbuf_length > ((uint64_t)(a_workbuf.len)))) {
+        status = wuffs_base__make_status(wuffs_base__error__bad_workbuf_length);
+        goto exit;
+      }
+      {
+        wuffs_base__io_buffer* o_0_v_w = v_w;
+        uint8_t *o_0_iop_v_w = iop_v_w;
+        uint8_t *o_0_io0_v_w = io0_v_w;
+        uint8_t *o_0_io1_v_w = io1_v_w;
+        uint8_t *o_0_io2_v_w = io2_v_w;
+        v_w = wuffs_base__io_writer__set(
+            &u_w,
+            &iop_v_w,
+            &io0_v_w,
+            &io1_v_w,
+            &io2_v_w,
+            wuffs_base__slice_u8__subslice_ij(a_workbuf,
+            self->private_impl.f_workbuf_wi,
+            self->private_impl.f_pass_workbuf_length),
+            ((uint64_t)(self->private_impl.f_workbuf_hist_pos_base + self->private_impl.f_workbuf_wi)));
+        {
+          const uint8_t *o_1_io2_a_src = io2_a_src;
+          wuffs_base__io_reader__limit(&io2_a_src, iop_a_src,
+              ((uint64_t)(self->private_impl.f_chunk_length)));
+          if (a_src) {
+            a_src->meta.wi = ((size_t)(io2_a_src - a_src->data.ptr));
+          }
+          v_w_mark = ((uint64_t)(iop_v_w - io0_v_w));
+          v_r_mark = ((uint64_t)(iop_a_src - io0_a_src));
+          {
+            u_w.meta.wi = ((size_t)(iop_v_w - u_w.data.ptr));
+            if (a_src) {
+              a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+            }
+            wuffs_base__status t_0 = wuffs_zlib__decoder__transform_io(&self->private_data.f_zlib, v_w, a_src, wuffs_base__utility__empty_slice_u8());
+            v_zlib_status = t_0;
+            iop_v_w = u_w.data.ptr + u_w.meta.wi;
+            if (a_src) {
+              iop_a_src = a_src->data.ptr + a_src->meta.ri;
+            }
+          }
+          if ( ! self->private_impl.f_ignore_checksum) {
+            wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__io__since(v_r_mark, ((uint64_t)(iop_a_src - io0_a_src)), io0_a_src));
+          }
+          wuffs_base__u32__sat_sub_indirect(&self->private_impl.f_chunk_length, ((uint32_t)((wuffs_base__io__count_since(v_r_mark, ((uint64_t)(iop_a_src - io0_a_src))) & 4294967295))));
+          wuffs_base__u64__sat_add_indirect(&self->private_impl.f_workbuf_wi, wuffs_base__io__count_since(v_w_mark, ((uint64_t)(iop_v_w - io0_v_w))));
+          io2_a_src = o_1_io2_a_src;
+          if (a_src) {
+            a_src->meta.wi = ((size_t)(io2_a_src - a_src->data.ptr));
+          }
+        }
+        v_w = o_0_v_w;
+        iop_v_w = o_0_iop_v_w;
+        io0_v_w = o_0_io0_v_w;
+        io1_v_w = o_0_io1_v_w;
+        io2_v_w = o_0_io2_v_w;
+      }
+      if (wuffs_base__status__is_ok(&v_zlib_status)) {
+        if (self->private_impl.f_chunk_length > 0) {
+          status = wuffs_base__make_status(wuffs_base__error__too_much_data);
+          goto exit;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+          uint32_t t_1;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_1 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_decode_pass[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_pass[0].scratch;
+              uint32_t num_bits_1 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_1);
+              if (num_bits_1 == 24) {
+                t_1 = ((uint32_t)(*scratch >> 32));
+                break;
+              }
+              num_bits_1 += 8;
+              *scratch |= ((uint64_t)(num_bits_1));
+            }
+          }
+          v_checksum_want = t_1;
+        }
+        if ( ! self->private_impl.f_ignore_checksum && (self->private_impl.f_chunk_type_array[0] == 73)) {
+          v_checksum_have = wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__utility__empty_slice_u8());
+          if (v_checksum_have != v_checksum_want) {
+            status = wuffs_base__make_status(wuffs_png__error__bad_checksum);
+            goto exit;
+          }
+        }
+        goto label__0__break;
+      } else if (v_zlib_status.repr == wuffs_base__suspension__short_write) {
+        if ((1 <= self->private_impl.f_interlace_pass) && (self->private_impl.f_interlace_pass <= 6)) {
+          goto label__0__break;
+        }
+        status = wuffs_base__make_status(wuffs_base__error__too_much_data);
+        goto exit;
+      } else if (v_zlib_status.repr != wuffs_base__suspension__short_read) {
+        status = v_zlib_status;
+        if (wuffs_base__status__is_error(&status)) {
+          goto exit;
+        } else if (wuffs_base__status__is_suspension(&status)) {
+          status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+          goto exit;
+        }
+        goto ok;
+      } else if (self->private_impl.f_chunk_length == 0) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(3);
+          uint32_t t_2;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_2 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_decode_pass[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(4);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_pass[0].scratch;
+              uint32_t num_bits_2 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_2);
+              if (num_bits_2 == 24) {
+                t_2 = ((uint32_t)(*scratch >> 32));
+                break;
+              }
+              num_bits_2 += 8;
+              *scratch |= ((uint64_t)(num_bits_2));
+            }
+          }
+          v_checksum_want = t_2;
+        }
+        if ( ! self->private_impl.f_ignore_checksum && (self->private_impl.f_chunk_type_array[0] == 73)) {
+          v_checksum_have = wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__utility__empty_slice_u8());
+          if (v_checksum_have != v_checksum_want) {
+            status = wuffs_base__make_status(wuffs_png__error__bad_checksum);
+            goto exit;
+          }
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(5);
+          uint32_t t_3;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_3 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_decode_pass[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(6);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_pass[0].scratch;
+              uint32_t num_bits_3 = ((uint32_t)(*scratch & 0xFF));
+              *scratch >>= 8;
+              *scratch <<= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_3);
+              if (num_bits_3 == 24) {
+                t_3 = ((uint32_t)(*scratch >> 32));
+                break;
+              }
+              num_bits_3 += 8;
+              *scratch |= ((uint64_t)(num_bits_3));
+            }
+          }
+          self->private_impl.f_chunk_length = t_3;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(7);
+          uint32_t t_4;
+          if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+            t_4 = wuffs_base__peek_u32le__no_bounds_check(iop_a_src);
+            iop_a_src += 4;
+          } else {
+            self->private_data.s_decode_pass[0].scratch = 0;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(8);
+            while (true) {
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint64_t* scratch = &self->private_data.s_decode_pass[0].scratch;
+              uint32_t num_bits_4 = ((uint32_t)(*scratch >> 56));
+              *scratch <<= 8;
+              *scratch >>= 8;
+              *scratch |= ((uint64_t)(*iop_a_src++)) << num_bits_4;
+              if (num_bits_4 == 24) {
+                t_4 = ((uint32_t)(*scratch));
+                break;
+              }
+              num_bits_4 += 8;
+              *scratch |= ((uint64_t)(num_bits_4)) << 56;
+            }
+          }
+          self->private_impl.f_chunk_type = t_4;
+        }
+        if (self->private_impl.f_chunk_type_array[0] == 73) {
+          if (self->private_impl.f_chunk_type != 1413563465) {
+            status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+            goto exit;
+          }
+          if ( ! self->private_impl.f_ignore_checksum) {
+            wuffs_base__ignore_status(wuffs_crc32__ieee_hasher__initialize(&self->private_data.f_crc32,
+                sizeof (wuffs_crc32__ieee_hasher), WUFFS_VERSION, WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
+            wuffs_crc32__ieee_hasher__update_u32(&self->private_data.f_crc32, wuffs_base__make_slice_u8(self->private_impl.f_chunk_type_array, 4));
+          }
+        } else {
+          if ((self->private_impl.f_chunk_type != 1413571686) || (self->private_impl.f_chunk_length < 4)) {
+            status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+            goto exit;
+          }
+          self->private_impl.f_chunk_length -= 4;
+          {
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT(9);
+            uint32_t t_5;
+            if (WUFFS_BASE__LIKELY(io2_a_src - iop_a_src >= 4)) {
+              t_5 = wuffs_base__peek_u32be__no_bounds_check(iop_a_src);
+              iop_a_src += 4;
+            } else {
+              self->private_data.s_decode_pass[0].scratch = 0;
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(10);
+              while (true) {
+                if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                  status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                  goto suspend;
+                }
+                uint64_t* scratch = &self->private_data.s_decode_pass[0].scratch;
+                uint32_t num_bits_5 = ((uint32_t)(*scratch & 0xFF));
+                *scratch >>= 8;
+                *scratch <<= 8;
+                *scratch |= ((uint64_t)(*iop_a_src++)) << (56 - num_bits_5);
+                if (num_bits_5 == 24) {
+                  t_5 = ((uint32_t)(*scratch >> 32));
+                  break;
+                }
+                num_bits_5 += 8;
+                *scratch |= ((uint64_t)(num_bits_5));
+              }
+            }
+            v_seq_num = t_5;
+          }
+          if (v_seq_num != self->private_impl.f_next_animation_seq_num) {
+            status = wuffs_base__make_status(wuffs_png__error__bad_animation_sequence_number);
+            goto exit;
+          } else if (self->private_impl.f_next_animation_seq_num >= 4294967295) {
+            status = wuffs_base__make_status(wuffs_png__error__unsupported_png_file);
+            goto exit;
+          }
+          self->private_impl.f_next_animation_seq_num += 1;
+        }
+        goto label__0__continue;
+      } else if (((uint64_t)(io2_a_src - iop_a_src)) > 0) {
+        status = wuffs_base__make_status(wuffs_png__error__internal_error_zlib_decoder_did_not_exhaust_its_input);
+        goto exit;
+      }
+      status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(11);
+    }
+    label__0__break:;
+    if (self->private_impl.f_workbuf_wi != self->private_impl.f_pass_workbuf_length) {
+      status = wuffs_base__make_status(wuffs_base__error__not_enough_data);
+      goto exit;
+    } else if (0 < ((uint64_t)(a_workbuf.len))) {
+      if (a_workbuf.ptr[0] == 4) {
+        a_workbuf.ptr[0] = 1;
+      }
+    }
+
+    ok:
+    self->private_impl.p_decode_pass[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_pass[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  return status;
+}
+
+// -------- func png.decoder.frame_dirty_rect
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_png__decoder__frame_dirty_rect(
+    const wuffs_png__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+
+  return wuffs_base__utility__make_rect_ie_u32(
+      self->private_impl.f_frame_rect_x0,
+      self->private_impl.f_frame_rect_y0,
+      self->private_impl.f_frame_rect_x1,
+      self->private_impl.f_frame_rect_y1);
+}
+
+// -------- func png.decoder.num_animation_loops
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_png__decoder__num_animation_loops(
+    const wuffs_png__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return self->private_impl.f_num_animation_loops_value;
+}
+
+// -------- func png.decoder.num_decoded_frame_configs
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_png__decoder__num_decoded_frame_configs(
+    const wuffs_png__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return ((uint64_t)(self->private_impl.f_num_decoded_frame_configs_value));
+}
+
+// -------- func png.decoder.num_decoded_frames
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_png__decoder__num_decoded_frames(
+    const wuffs_png__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return ((uint64_t)(self->private_impl.f_num_decoded_frames_value));
+}
+
+// -------- func png.decoder.restart_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_png__decoder__restart_frame(
+    wuffs_png__decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+
+  if (self->private_impl.f_call_sequence < 3) {
+    return wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+  } else if ((a_index >= ((uint64_t)(self->private_impl.f_num_animation_frames_value))) || ((a_index == 0) && (a_io_position != self->private_impl.f_first_config_io_position))) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  self->private_impl.f_call_sequence = 3;
+  if (self->private_impl.f_interlace_pass >= 1) {
+    self->private_impl.f_interlace_pass = 1;
+  }
+  self->private_impl.f_frame_config_io_position = a_io_position;
+  self->private_impl.f_num_decoded_frame_configs_value = ((uint32_t)((a_index & 4294967295)));
+  self->private_impl.f_num_decoded_frames_value = self->private_impl.f_num_decoded_frame_configs_value;
+  return wuffs_base__make_status(NULL);
+}
+
+// -------- func png.decoder.set_report_metadata
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_png__decoder__set_report_metadata(
+    wuffs_png__decoder* self,
+    uint32_t a_fourcc,
+    bool a_report) {
+  if (!self) {
+    return wuffs_base__make_empty_struct();
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_empty_struct();
+  }
+
+  if (a_fourcc == 1128813133) {
+    self->private_impl.f_report_metadata_chrm = a_report;
+  } else if (a_fourcc == 1195461953) {
+    self->private_impl.f_report_metadata_gama = a_report;
+  } else if (a_fourcc == 1229144912) {
+    self->private_impl.f_report_metadata_iccp = a_report;
+  } else if (a_fourcc == 1263947808) {
+    self->private_impl.f_report_metadata_kvp = a_report;
+  } else if (a_fourcc == 1397901122) {
+    self->private_impl.f_report_metadata_srgb = a_report;
+  }
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func png.decoder.tell_me_more
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_png__decoder__tell_me_more(
+    wuffs_png__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 4)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_c = 0;
+  uint16_t v_c2 = 0;
+  wuffs_base__io_buffer u_w = wuffs_base__empty_io_buffer();
+  wuffs_base__io_buffer* v_w = &u_w;
+  uint8_t* iop_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io0_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_v_w WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint64_t v_num_written = 0;
+  uint64_t v_w_mark = 0;
+  uint64_t v_r_mark = 0;
+  wuffs_base__status v_zlib_status = wuffs_base__make_status(NULL);
+
+  uint8_t* iop_a_dst = NULL;
+  uint8_t* io0_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io1_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  uint8_t* io2_a_dst WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_dst) {
+    io0_a_dst = a_dst->data.ptr;
+    io1_a_dst = io0_a_dst + a_dst->meta.wi;
+    iop_a_dst = io1_a_dst;
+    io2_a_dst = io0_a_dst + a_dst->data.len;
+    if (a_dst->meta.closed) {
+      io2_a_dst = iop_a_dst;
+    }
+  }
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_tell_me_more[0];
+  if (coro_susp_point) {
+    v_zlib_status = self->private_data.s_tell_me_more[0].v_zlib_status;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence != 1) {
+      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+      goto exit;
+    }
+    if (self->private_impl.f_metadata_fourcc == 0) {
+      status = wuffs_base__make_status(wuffs_base__error__no_more_information);
+      goto exit;
+    }
+    if (self->private_impl.f_metadata_is_zlib_compressed) {
+      if (self->private_impl.f_zlib_is_dirty) {
+        wuffs_base__ignore_status(wuffs_zlib__decoder__initialize(&self->private_data.f_zlib,
+            sizeof (wuffs_zlib__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED));
+        if (self->private_impl.f_ignore_checksum) {
+          wuffs_zlib__decoder__set_quirk_enabled(&self->private_data.f_zlib, 1, true);
+        }
+      }
+      self->private_impl.f_zlib_is_dirty = true;
+      self->private_impl.f_ztxt_hist_pos = 0;
+    }
+    label__loop__continue:;
+    while (true) {
+      if (a_minfo != NULL) {
+        wuffs_base__more_information__set(a_minfo,
+            self->private_impl.f_metadata_flavor,
+            self->private_impl.f_metadata_fourcc,
+            self->private_impl.f_metadata_x,
+            self->private_impl.f_metadata_y,
+            self->private_impl.f_metadata_z);
+      }
+      if (self->private_impl.f_metadata_flavor != 4) {
+        goto label__loop__break;
+      }
+      if (self->private_impl.f_metadata_is_zlib_compressed) {
+        if (self->private_impl.f_chunk_type == 1346585449) {
+          {
+            const uint8_t *o_0_io2_a_src = io2_a_src;
+            wuffs_base__io_reader__limit(&io2_a_src, iop_a_src,
+                ((uint64_t)(self->private_impl.f_chunk_length)));
+            if (a_src) {
+              a_src->meta.wi = ((size_t)(io2_a_src - a_src->data.ptr));
+            }
+            v_r_mark = ((uint64_t)(iop_a_src - io0_a_src));
+            {
+              if (a_dst) {
+                a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+              }
+              if (a_src) {
+                a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+              }
+              wuffs_base__status t_0 = wuffs_zlib__decoder__transform_io(&self->private_data.f_zlib, a_dst, a_src, wuffs_base__utility__empty_slice_u8());
+              v_zlib_status = t_0;
+              if (a_dst) {
+                iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+              }
+              if (a_src) {
+                iop_a_src = a_src->data.ptr + a_src->meta.ri;
+              }
+            }
+            wuffs_base__u32__sat_sub_indirect(&self->private_impl.f_chunk_length, ((uint32_t)((wuffs_base__io__count_since(v_r_mark, ((uint64_t)(iop_a_src - io0_a_src))) & 4294967295))));
+            io2_a_src = o_0_io2_a_src;
+            if (a_src) {
+              a_src->meta.wi = ((size_t)(io2_a_src - a_src->data.ptr));
+            }
+          }
+          if (wuffs_base__status__is_ok(&v_zlib_status)) {
+            self->private_impl.f_metadata_is_zlib_compressed = false;
+            goto label__loop__break;
+          } else if ( ! wuffs_base__status__is_suspension(&v_zlib_status)) {
+            status = v_zlib_status;
+            if (wuffs_base__status__is_error(&status)) {
+              goto exit;
+            } else if (wuffs_base__status__is_suspension(&status)) {
+              status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+              goto exit;
+            }
+            goto ok;
+          }
+          status = v_zlib_status;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(1);
+        } else if (self->private_impl.f_chunk_type == 1951945833) {
+          {
+            const uint8_t *o_1_io2_a_src = io2_a_src;
+            wuffs_base__io_reader__limit(&io2_a_src, iop_a_src,
+                ((uint64_t)(self->private_impl.f_chunk_length)));
+            if (a_src) {
+              a_src->meta.wi = ((size_t)(io2_a_src - a_src->data.ptr));
+            }
+            v_r_mark = ((uint64_t)(iop_a_src - io0_a_src));
+            {
+              if (a_dst) {
+                a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+              }
+              if (a_src) {
+                a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+              }
+              wuffs_base__status t_1 = wuffs_zlib__decoder__transform_io(&self->private_data.f_zlib, a_dst, a_src, wuffs_base__utility__empty_slice_u8());
+              v_zlib_status = t_1;
+              if (a_dst) {
+                iop_a_dst = a_dst->data.ptr + a_dst->meta.wi;
+              }
+              if (a_src) {
+                iop_a_src = a_src->data.ptr + a_src->meta.ri;
+              }
+            }
+            wuffs_base__u32__sat_sub_indirect(&self->private_impl.f_chunk_length, ((uint32_t)((wuffs_base__io__count_since(v_r_mark, ((uint64_t)(iop_a_src - io0_a_src))) & 4294967295))));
+            io2_a_src = o_1_io2_a_src;
+            if (a_src) {
+              a_src->meta.wi = ((size_t)(io2_a_src - a_src->data.ptr));
+            }
+          }
+          if (wuffs_base__status__is_ok(&v_zlib_status)) {
+            self->private_impl.f_metadata_is_zlib_compressed = false;
+            goto label__loop__break;
+          } else if ( ! wuffs_base__status__is_suspension(&v_zlib_status)) {
+            status = v_zlib_status;
+            if (wuffs_base__status__is_error(&status)) {
+              goto exit;
+            } else if (wuffs_base__status__is_suspension(&status)) {
+              status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+              goto exit;
+            }
+            goto ok;
+          }
+          status = v_zlib_status;
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+        } else if (self->private_impl.f_chunk_type == 1951945850) {
+          if (self->private_impl.f_ztxt_ri == self->private_impl.f_ztxt_wi) {
+            {
+              wuffs_base__io_buffer* o_2_v_w = v_w;
+              uint8_t *o_2_iop_v_w = iop_v_w;
+              uint8_t *o_2_io0_v_w = io0_v_w;
+              uint8_t *o_2_io1_v_w = io1_v_w;
+              uint8_t *o_2_io2_v_w = io2_v_w;
+              v_w = wuffs_base__io_writer__set(
+                  &u_w,
+                  &iop_v_w,
+                  &io0_v_w,
+                  &io1_v_w,
+                  &io2_v_w,
+                  wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024),
+                  self->private_impl.f_ztxt_hist_pos);
+              {
+                const uint8_t *o_3_io2_a_src = io2_a_src;
+                wuffs_base__io_reader__limit(&io2_a_src, iop_a_src,
+                    ((uint64_t)(self->private_impl.f_chunk_length)));
+                if (a_src) {
+                  a_src->meta.wi = ((size_t)(io2_a_src - a_src->data.ptr));
+                }
+                v_w_mark = ((uint64_t)(iop_v_w - io0_v_w));
+                v_r_mark = ((uint64_t)(iop_a_src - io0_a_src));
+                {
+                  u_w.meta.wi = ((size_t)(iop_v_w - u_w.data.ptr));
+                  if (a_src) {
+                    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+                  }
+                  wuffs_base__status t_2 = wuffs_zlib__decoder__transform_io(&self->private_data.f_zlib, v_w, a_src, wuffs_base__utility__empty_slice_u8());
+                  v_zlib_status = t_2;
+                  iop_v_w = u_w.data.ptr + u_w.meta.wi;
+                  if (a_src) {
+                    iop_a_src = a_src->data.ptr + a_src->meta.ri;
+                  }
+                }
+                wuffs_base__u32__sat_sub_indirect(&self->private_impl.f_chunk_length, ((uint32_t)((wuffs_base__io__count_since(v_r_mark, ((uint64_t)(iop_a_src - io0_a_src))) & 4294967295))));
+                v_num_written = wuffs_base__io__count_since(v_w_mark, ((uint64_t)(iop_v_w - io0_v_w)));
+                io2_a_src = o_3_io2_a_src;
+                if (a_src) {
+                  a_src->meta.wi = ((size_t)(io2_a_src - a_src->data.ptr));
+                }
+              }
+              v_w = o_2_v_w;
+              iop_v_w = o_2_iop_v_w;
+              io0_v_w = o_2_io0_v_w;
+              io1_v_w = o_2_io1_v_w;
+              io2_v_w = o_2_io2_v_w;
+            }
+            if (v_num_written > 1024) {
+              status = wuffs_base__make_status(wuffs_png__error__internal_error_inconsistent_i_o);
+              goto exit;
+            }
+            self->private_impl.f_ztxt_ri = 0;
+            self->private_impl.f_ztxt_wi = ((uint32_t)(v_num_written));
+            wuffs_base__u64__sat_add_indirect(&self->private_impl.f_ztxt_hist_pos, v_num_written);
+          }
+          while (self->private_impl.f_ztxt_ri < self->private_impl.f_ztxt_wi) {
+            v_c2 = WUFFS_PNG__LATIN_1[self->private_data.f_dst_palette[self->private_impl.f_ztxt_ri]];
+            if (v_c2 == 0) {
+              status = wuffs_base__make_status(wuffs_png__error__bad_text_chunk_not_latin_1);
+              goto exit;
+            } else if (v_c2 <= 127) {
+              if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(3);
+                v_c2 = 0;
+                goto label__loop__continue;
+              }
+              self->private_impl.f_ztxt_ri += 1;
+              (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(v_c2))), iop_a_dst += 1);
+            } else {
+              if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 1) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+                WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(4);
+                v_c2 = 0;
+                goto label__loop__continue;
+              }
+              self->private_impl.f_ztxt_ri += 1;
+              (wuffs_base__poke_u16le__no_bounds_check(iop_a_dst, v_c2), iop_a_dst += 2);
+            }
+          }
+          if (wuffs_base__status__is_ok(&v_zlib_status)) {
+            self->private_impl.f_metadata_is_zlib_compressed = false;
+            goto label__loop__break;
+          } else if ( ! wuffs_base__status__is_suspension(&v_zlib_status)) {
+            status = v_zlib_status;
+            if (wuffs_base__status__is_error(&status)) {
+              goto exit;
+            } else if (wuffs_base__status__is_suspension(&status)) {
+              status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+              goto exit;
+            }
+            goto ok;
+          } else if (v_zlib_status.repr != wuffs_base__suspension__short_write) {
+            status = v_zlib_status;
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(5);
+          }
+        } else {
+          status = wuffs_base__make_status(wuffs_png__error__internal_error_inconsistent_chunk_type);
+          goto exit;
+        }
+      } else if ((self->private_impl.f_chunk_type == 1951945833) && (self->private_impl.f_metadata_fourcc == 1263947862)) {
+        while (true) {
+          if (self->private_impl.f_chunk_length <= 0) {
+            goto label__loop__break;
+          } else if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(6);
+            goto label__loop__continue;
+          } else if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(7);
+            goto label__loop__continue;
+          }
+          self->private_impl.f_chunk_length -= 1;
+          v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+          iop_a_src += 1;
+          (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, v_c), iop_a_dst += 1);
+        }
+      } else {
+        while (true) {
+          if (self->private_impl.f_chunk_length <= 0) {
+            if (self->private_impl.f_metadata_fourcc == 1263947851) {
+              status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+              goto exit;
+            }
+            goto label__loop__break;
+          } else if (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(8);
+            goto label__loop__continue;
+          }
+          v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+          if (v_c == 0) {
+            self->private_impl.f_chunk_length -= 1;
+            iop_a_src += 1;
+            goto label__loop__break;
+          }
+          v_c2 = WUFFS_PNG__LATIN_1[v_c];
+          if (v_c2 == 0) {
+            status = wuffs_base__make_status(wuffs_png__error__bad_text_chunk_not_latin_1);
+            goto exit;
+          } else if (v_c2 <= 127) {
+            if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 0) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(9);
+              v_c2 = 0;
+              goto label__loop__continue;
+            }
+            self->private_impl.f_chunk_length -= 1;
+            iop_a_src += 1;
+            (wuffs_base__poke_u8be__no_bounds_check(iop_a_dst, ((uint8_t)(v_c2))), iop_a_dst += 1);
+          } else {
+            if (((uint64_t)(io2_a_dst - iop_a_dst)) <= 1) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_write);
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(10);
+              v_c2 = 0;
+              goto label__loop__continue;
+            }
+            self->private_impl.f_chunk_length -= 1;
+            iop_a_src += 1;
+            (wuffs_base__poke_u16le__no_bounds_check(iop_a_dst, v_c2), iop_a_dst += 2);
+          }
+        }
+      }
+    }
+    label__loop__break:;
+    if (self->private_impl.f_metadata_fourcc == 1263947851) {
+      self->private_impl.f_metadata_fourcc = 1263947862;
+      if (self->private_impl.f_chunk_type == 1951945833) {
+        if (self->private_impl.f_chunk_length <= 1) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        self->private_impl.f_chunk_length -= 2;
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(11);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint8_t t_3 = *iop_a_src++;
+          v_c = t_3;
+        }
+        if (v_c == 0) {
+          self->private_impl.f_metadata_is_zlib_compressed = false;
+        } else if (v_c == 1) {
+          self->private_impl.f_metadata_is_zlib_compressed = true;
+        } else {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(12);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint8_t t_4 = *iop_a_src++;
+          v_c = t_4;
+        }
+        if ((v_c != 0) && self->private_impl.f_metadata_is_zlib_compressed) {
+          status = wuffs_base__make_status(wuffs_png__error__unsupported_png_compression_method);
+          goto exit;
+        }
+        self->private_impl.f_metadata_fourcc -= 2;
+        while (self->private_impl.f_metadata_fourcc != 1263947862) {
+          self->private_impl.f_metadata_fourcc += 1;
+          while (true) {
+            if (self->private_impl.f_chunk_length <= 0) {
+              status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+              goto exit;
+            }
+            self->private_impl.f_chunk_length -= 1;
+            {
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT(13);
+              if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+                status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+                goto suspend;
+              }
+              uint8_t t_5 = *iop_a_src++;
+              v_c = t_5;
+            }
+            if (v_c == 0) {
+              goto label__0__break;
+            }
+          }
+          label__0__break:;
+        }
+      } else if (self->private_impl.f_chunk_type == 1951945850) {
+        if (self->private_impl.f_chunk_length <= 0) {
+          status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+          goto exit;
+        }
+        self->private_impl.f_chunk_length -= 1;
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(14);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint8_t t_6 = *iop_a_src++;
+          v_c = t_6;
+        }
+        if (v_c != 0) {
+          status = wuffs_base__make_status(wuffs_png__error__unsupported_png_compression_method);
+          goto exit;
+        }
+        self->private_impl.f_metadata_is_zlib_compressed = true;
+      }
+    } else {
+      if (self->private_impl.f_chunk_length != 0) {
+        status = wuffs_base__make_status(wuffs_png__error__bad_chunk);
+        goto exit;
+      }
+      self->private_data.s_tell_me_more[0].scratch = 4;
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(15);
+      if (self->private_data.s_tell_me_more[0].scratch > ((uint64_t)(io2_a_src - iop_a_src))) {
+        self->private_data.s_tell_me_more[0].scratch -= ((uint64_t)(io2_a_src - iop_a_src));
+        iop_a_src = io2_a_src;
+        status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+        goto suspend;
+      }
+      iop_a_src += self->private_data.s_tell_me_more[0].scratch;
+      self->private_impl.f_metadata_flavor = 0;
+      self->private_impl.f_metadata_fourcc = 0;
+      self->private_impl.f_metadata_x = 0;
+      self->private_impl.f_metadata_y = 0;
+      self->private_impl.f_metadata_z = 0;
+    }
+    self->private_impl.f_call_sequence = 2;
+    status = wuffs_base__make_status(NULL);
+    goto ok;
+
+    ok:
+    self->private_impl.p_tell_me_more[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_tell_me_more[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 4 : 0;
+  self->private_data.s_tell_me_more[0].v_zlib_status = v_zlib_status;
+
+  goto exit;
+  exit:
+  if (a_dst) {
+    a_dst->meta.wi = ((size_t)(iop_a_dst - a_dst->data.ptr));
+  }
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func png.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_png__decoder__workbuf_len(
+    const wuffs_png__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(self->private_impl.f_overall_workbuf_length, self->private_impl.f_overall_workbuf_length);
+}
+
+// -------- func png.decoder.filter_and_swizzle
+
+static wuffs_base__status
+wuffs_png__decoder__filter_and_swizzle(
+    wuffs_png__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__slice_u8 a_workbuf) {
+  return (*self->private_impl.choosy_filter_and_swizzle)(self, a_dst, a_workbuf);
+}
+
+static wuffs_base__status
+wuffs_png__decoder__filter_and_swizzle__choosy_default(
+    wuffs_png__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__slice_u8 a_workbuf) {
+  wuffs_base__pixel_format v_dst_pixfmt = {0};
+  uint32_t v_dst_bits_per_pixel = 0;
+  uint64_t v_dst_bytes_per_pixel = 0;
+  uint64_t v_dst_bytes_per_row0 = 0;
+  uint64_t v_dst_bytes_per_row1 = 0;
+  wuffs_base__slice_u8 v_dst_palette = {0};
+  wuffs_base__table_u8 v_tab = {0};
+  uint32_t v_y = 0;
+  wuffs_base__slice_u8 v_dst = {0};
+  uint8_t v_filter = 0;
+  wuffs_base__slice_u8 v_curr_row = {0};
+  wuffs_base__slice_u8 v_prev_row = {0};
+
+  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
+  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
+  if ((v_dst_bits_per_pixel & 7) != 0) {
+    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
+  }
+  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
+  v_dst_bytes_per_row0 = (((uint64_t)(self->private_impl.f_frame_rect_x0)) * v_dst_bytes_per_pixel);
+  v_dst_bytes_per_row1 = (((uint64_t)(self->private_impl.f_frame_rect_x1)) * v_dst_bytes_per_pixel);
+  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024));
+  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
+  if (v_dst_bytes_per_row1 < ((uint64_t)(v_tab.width))) {
+    v_tab = wuffs_base__table_u8__subtable_ij(v_tab,
+        0,
+        0,
+        v_dst_bytes_per_row1,
+        ((uint64_t)(v_tab.height)));
+  }
+  if (v_dst_bytes_per_row0 < ((uint64_t)(v_tab.width))) {
+    v_tab = wuffs_base__table_u8__subtable_ij(v_tab,
+        v_dst_bytes_per_row0,
+        0,
+        ((uint64_t)(v_tab.width)),
+        ((uint64_t)(v_tab.height)));
+  } else {
+    v_tab = wuffs_base__table_u8__subtable_ij(v_tab,
+        0,
+        0,
+        0,
+        0);
+  }
+  v_y = self->private_impl.f_frame_rect_y0;
+  while (v_y < self->private_impl.f_frame_rect_y1) {
+    v_dst = wuffs_base__table_u8__row_u32(v_tab, v_y);
+    if (1 > ((uint64_t)(a_workbuf.len))) {
+      return wuffs_base__make_status(wuffs_png__error__internal_error_inconsistent_workbuf_length);
+    }
+    v_filter = a_workbuf.ptr[0];
+    a_workbuf = wuffs_base__slice_u8__subslice_i(a_workbuf, 1);
+    if (self->private_impl.f_pass_bytes_per_row > ((uint64_t)(a_workbuf.len))) {
+      return wuffs_base__make_status(wuffs_png__error__internal_error_inconsistent_workbuf_length);
+    }
+    v_curr_row = wuffs_base__slice_u8__subslice_j(a_workbuf, self->private_impl.f_pass_bytes_per_row);
+    a_workbuf = wuffs_base__slice_u8__subslice_i(a_workbuf, self->private_impl.f_pass_bytes_per_row);
+    if (v_filter == 0) {
+    } else if (v_filter == 1) {
+      wuffs_png__decoder__filter_1(self, v_curr_row);
+    } else if (v_filter == 2) {
+      wuffs_png__decoder__filter_2(self, v_curr_row, v_prev_row);
+    } else if (v_filter == 3) {
+      wuffs_png__decoder__filter_3(self, v_curr_row, v_prev_row);
+    } else if (v_filter == 4) {
+      wuffs_png__decoder__filter_4(self, v_curr_row, v_prev_row);
+    } else {
+      return wuffs_base__make_status(wuffs_png__error__bad_filter);
+    }
+    wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, v_dst_palette, v_curr_row);
+    v_prev_row = v_curr_row;
+    v_y += 1;
+  }
+  return wuffs_base__make_status(NULL);
+}
+
+// -------- func png.decoder.filter_and_swizzle_tricky
+
+static wuffs_base__status
+wuffs_png__decoder__filter_and_swizzle_tricky(
+    wuffs_png__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__slice_u8 a_workbuf) {
+  wuffs_base__pixel_format v_dst_pixfmt = {0};
+  uint32_t v_dst_bits_per_pixel = 0;
+  uint64_t v_dst_bytes_per_pixel = 0;
+  uint64_t v_dst_bytes_per_row1 = 0;
+  wuffs_base__slice_u8 v_dst_palette = {0};
+  wuffs_base__table_u8 v_tab = {0};
+  uint64_t v_src_bytes_per_pixel = 0;
+  uint32_t v_x = 0;
+  uint32_t v_y = 0;
+  uint64_t v_i = 0;
+  wuffs_base__slice_u8 v_dst = {0};
+  uint8_t v_filter = 0;
+  wuffs_base__slice_u8 v_s = {0};
+  wuffs_base__slice_u8 v_curr_row = {0};
+  wuffs_base__slice_u8 v_prev_row = {0};
+  uint8_t v_bits_unpacked[8] = {0};
+  uint8_t v_bits_packed = 0;
+  uint8_t v_packs_remaining = 0;
+  uint8_t v_multiplier = 0;
+  uint8_t v_shift = 0;
+
+  v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
+  v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
+  if ((v_dst_bits_per_pixel & 7) != 0) {
+    return wuffs_base__make_status(wuffs_base__error__unsupported_option);
+  }
+  v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
+  v_dst_bytes_per_row1 = (((uint64_t)(self->private_impl.f_frame_rect_x1)) * v_dst_bytes_per_pixel);
+  v_dst_palette = wuffs_base__pixel_buffer__palette_or_else(a_dst, wuffs_base__make_slice_u8(self->private_data.f_dst_palette, 1024));
+  v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
+  v_src_bytes_per_pixel = 1;
+  if (self->private_impl.f_depth >= 8) {
+    v_src_bytes_per_pixel = (((uint64_t)(WUFFS_PNG__NUM_CHANNELS[self->private_impl.f_color_type])) * ((uint64_t)((self->private_impl.f_depth >> 3))));
+  }
+  if (self->private_impl.f_chunk_type_array[0] == 73) {
+    v_y = ((uint32_t)(WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][5]));
+  } else {
+    v_y = self->private_impl.f_frame_rect_y0;
+  }
+  while (v_y < self->private_impl.f_frame_rect_y1) {
+    v_dst = wuffs_base__table_u8__row_u32(v_tab, v_y);
+    if (v_dst_bytes_per_row1 < ((uint64_t)(v_dst.len))) {
+      v_dst = wuffs_base__slice_u8__subslice_j(v_dst, v_dst_bytes_per_row1);
+    }
+    if (1 > ((uint64_t)(a_workbuf.len))) {
+      return wuffs_base__make_status(wuffs_png__error__internal_error_inconsistent_workbuf_length);
+    }
+    v_filter = a_workbuf.ptr[0];
+    a_workbuf = wuffs_base__slice_u8__subslice_i(a_workbuf, 1);
+    if (self->private_impl.f_pass_bytes_per_row > ((uint64_t)(a_workbuf.len))) {
+      return wuffs_base__make_status(wuffs_png__error__internal_error_inconsistent_workbuf_length);
+    }
+    v_curr_row = wuffs_base__slice_u8__subslice_j(a_workbuf, self->private_impl.f_pass_bytes_per_row);
+    a_workbuf = wuffs_base__slice_u8__subslice_i(a_workbuf, self->private_impl.f_pass_bytes_per_row);
+    if (v_filter == 0) {
+    } else if (v_filter == 1) {
+      wuffs_png__decoder__filter_1(self, v_curr_row);
+    } else if (v_filter == 2) {
+      wuffs_png__decoder__filter_2(self, v_curr_row, v_prev_row);
+    } else if (v_filter == 3) {
+      wuffs_png__decoder__filter_3(self, v_curr_row, v_prev_row);
+    } else if (v_filter == 4) {
+      wuffs_png__decoder__filter_4(self, v_curr_row, v_prev_row);
+    } else {
+      return wuffs_base__make_status(wuffs_png__error__bad_filter);
+    }
+    v_s = v_curr_row;
+    if (self->private_impl.f_chunk_type_array[0] == 73) {
+      v_x = ((uint32_t)(WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][2]));
+    } else {
+      v_x = self->private_impl.f_frame_rect_x0;
+    }
+    if (self->private_impl.f_depth == 8) {
+      while (v_x < self->private_impl.f_frame_rect_x1) {
+        v_i = (((uint64_t)(v_x)) * v_dst_bytes_per_pixel);
+        if (v_i <= ((uint64_t)(v_dst.len))) {
+          if (self->private_impl.f_color_type == 4) {
+            if (2 <= ((uint64_t)(v_s.len))) {
+              v_bits_unpacked[0] = v_s.ptr[0];
+              v_bits_unpacked[1] = v_s.ptr[0];
+              v_bits_unpacked[2] = v_s.ptr[0];
+              v_bits_unpacked[3] = v_s.ptr[1];
+              v_s = wuffs_base__slice_u8__subslice_i(v_s, 2);
+              wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__make_slice_u8(v_bits_unpacked, 4));
+            }
+          } else if (((uint32_t)((self->private_impl.f_remap_transparency & 4294967295))) != 0) {
+            if (self->private_impl.f_color_type == 0) {
+              if (1 <= ((uint64_t)(v_s.len))) {
+                v_bits_unpacked[0] = v_s.ptr[0];
+                v_bits_unpacked[1] = v_s.ptr[0];
+                v_bits_unpacked[2] = v_s.ptr[0];
+                v_bits_unpacked[3] = 255;
+                v_s = wuffs_base__slice_u8__subslice_i(v_s, 1);
+                if (((uint32_t)((self->private_impl.f_remap_transparency & 4294967295))) == ((((uint32_t)(v_bits_unpacked[0])) << 0) |
+                    (((uint32_t)(v_bits_unpacked[1])) << 8) |
+                    (((uint32_t)(v_bits_unpacked[2])) << 16) |
+                    (((uint32_t)(v_bits_unpacked[3])) << 24))) {
+                  v_bits_unpacked[0] = 0;
+                  v_bits_unpacked[1] = 0;
+                  v_bits_unpacked[2] = 0;
+                  v_bits_unpacked[3] = 0;
+                }
+                wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__make_slice_u8(v_bits_unpacked, 4));
+              }
+            } else {
+              if (3 <= ((uint64_t)(v_s.len))) {
+                v_bits_unpacked[0] = v_s.ptr[2];
+                v_bits_unpacked[1] = v_s.ptr[1];
+                v_bits_unpacked[2] = v_s.ptr[0];
+                v_bits_unpacked[3] = 255;
+                v_s = wuffs_base__slice_u8__subslice_i(v_s, 3);
+                if (((uint32_t)((self->private_impl.f_remap_transparency & 4294967295))) == ((((uint32_t)(v_bits_unpacked[0])) << 0) |
+                    (((uint32_t)(v_bits_unpacked[1])) << 8) |
+                    (((uint32_t)(v_bits_unpacked[2])) << 16) |
+                    (((uint32_t)(v_bits_unpacked[3])) << 24))) {
+                  v_bits_unpacked[0] = 0;
+                  v_bits_unpacked[1] = 0;
+                  v_bits_unpacked[2] = 0;
+                  v_bits_unpacked[3] = 0;
+                }
+                wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__make_slice_u8(v_bits_unpacked, 4));
+              }
+            }
+          } else if (v_src_bytes_per_pixel <= ((uint64_t)(v_s.len))) {
+            wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__slice_u8__subslice_j(v_s, v_src_bytes_per_pixel));
+            v_s = wuffs_base__slice_u8__subslice_i(v_s, v_src_bytes_per_pixel);
+          }
+        }
+        v_x += (((uint32_t)(1)) << WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][0]);
+      }
+    } else if (self->private_impl.f_depth < 8) {
+      v_multiplier = 1;
+      if (self->private_impl.f_color_type == 0) {
+        v_multiplier = WUFFS_PNG__LOW_BIT_DEPTH_MULTIPLIERS[self->private_impl.f_depth];
+      }
+      v_shift = ((8 - self->private_impl.f_depth) & 7);
+      v_packs_remaining = 0;
+      while (v_x < self->private_impl.f_frame_rect_x1) {
+        v_i = (((uint64_t)(v_x)) * v_dst_bytes_per_pixel);
+        if (v_i <= ((uint64_t)(v_dst.len))) {
+          if ((v_packs_remaining == 0) && (1 <= ((uint64_t)(v_s.len)))) {
+            v_packs_remaining = WUFFS_PNG__LOW_BIT_DEPTH_NUM_PACKS[self->private_impl.f_depth];
+            v_bits_packed = v_s.ptr[0];
+            v_s = wuffs_base__slice_u8__subslice_i(v_s, 1);
+          }
+          v_bits_unpacked[0] = ((uint8_t)((v_bits_packed >> v_shift) * v_multiplier));
+          v_bits_packed = ((uint8_t)(v_bits_packed << self->private_impl.f_depth));
+          v_packs_remaining = ((uint8_t)(v_packs_remaining - 1));
+          if (((uint32_t)((self->private_impl.f_remap_transparency & 4294967295))) != 0) {
+            v_bits_unpacked[1] = v_bits_unpacked[0];
+            v_bits_unpacked[2] = v_bits_unpacked[0];
+            v_bits_unpacked[3] = 255;
+            if (((uint32_t)((self->private_impl.f_remap_transparency & 4294967295))) == ((((uint32_t)(v_bits_unpacked[0])) << 0) |
+                (((uint32_t)(v_bits_unpacked[1])) << 8) |
+                (((uint32_t)(v_bits_unpacked[2])) << 16) |
+                (((uint32_t)(v_bits_unpacked[3])) << 24))) {
+              v_bits_unpacked[0] = 0;
+              v_bits_unpacked[1] = 0;
+              v_bits_unpacked[2] = 0;
+              v_bits_unpacked[3] = 0;
+            }
+            wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__make_slice_u8(v_bits_unpacked, 4));
+          } else {
+            wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__make_slice_u8(v_bits_unpacked, 1));
+          }
+        }
+        v_x += (((uint32_t)(1)) << WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][0]);
+      }
+    } else {
+      while (v_x < self->private_impl.f_frame_rect_x1) {
+        v_i = (((uint64_t)(v_x)) * v_dst_bytes_per_pixel);
+        if (v_i <= ((uint64_t)(v_dst.len))) {
+          if (self->private_impl.f_color_type == 0) {
+            if (2 <= ((uint64_t)(v_s.len))) {
+              v_bits_unpacked[0] = v_s.ptr[1];
+              v_bits_unpacked[1] = v_s.ptr[0];
+              v_bits_unpacked[2] = v_s.ptr[1];
+              v_bits_unpacked[3] = v_s.ptr[0];
+              v_bits_unpacked[4] = v_s.ptr[1];
+              v_bits_unpacked[5] = v_s.ptr[0];
+              v_bits_unpacked[6] = 255;
+              v_bits_unpacked[7] = 255;
+              v_s = wuffs_base__slice_u8__subslice_i(v_s, 2);
+              if (self->private_impl.f_remap_transparency == ((((uint64_t)(v_bits_unpacked[0])) << 0) |
+                  (((uint64_t)(v_bits_unpacked[1])) << 8) |
+                  (((uint64_t)(v_bits_unpacked[2])) << 16) |
+                  (((uint64_t)(v_bits_unpacked[3])) << 24) |
+                  (((uint64_t)(v_bits_unpacked[4])) << 32) |
+                  (((uint64_t)(v_bits_unpacked[5])) << 40) |
+                  (((uint64_t)(v_bits_unpacked[6])) << 48) |
+                  (((uint64_t)(v_bits_unpacked[7])) << 56))) {
+                v_bits_unpacked[0] = 0;
+                v_bits_unpacked[1] = 0;
+                v_bits_unpacked[2] = 0;
+                v_bits_unpacked[3] = 0;
+                v_bits_unpacked[4] = 0;
+                v_bits_unpacked[5] = 0;
+                v_bits_unpacked[6] = 0;
+                v_bits_unpacked[7] = 0;
+              }
+            }
+          } else if (self->private_impl.f_color_type == 2) {
+            if (6 <= ((uint64_t)(v_s.len))) {
+              v_bits_unpacked[0] = v_s.ptr[5];
+              v_bits_unpacked[1] = v_s.ptr[4];
+              v_bits_unpacked[2] = v_s.ptr[3];
+              v_bits_unpacked[3] = v_s.ptr[2];
+              v_bits_unpacked[4] = v_s.ptr[1];
+              v_bits_unpacked[5] = v_s.ptr[0];
+              v_bits_unpacked[6] = 255;
+              v_bits_unpacked[7] = 255;
+              v_s = wuffs_base__slice_u8__subslice_i(v_s, 6);
+              if (self->private_impl.f_remap_transparency == ((((uint64_t)(v_bits_unpacked[0])) << 0) |
+                  (((uint64_t)(v_bits_unpacked[1])) << 8) |
+                  (((uint64_t)(v_bits_unpacked[2])) << 16) |
+                  (((uint64_t)(v_bits_unpacked[3])) << 24) |
+                  (((uint64_t)(v_bits_unpacked[4])) << 32) |
+                  (((uint64_t)(v_bits_unpacked[5])) << 40) |
+                  (((uint64_t)(v_bits_unpacked[6])) << 48) |
+                  (((uint64_t)(v_bits_unpacked[7])) << 56))) {
+                v_bits_unpacked[0] = 0;
+                v_bits_unpacked[1] = 0;
+                v_bits_unpacked[2] = 0;
+                v_bits_unpacked[3] = 0;
+                v_bits_unpacked[4] = 0;
+                v_bits_unpacked[5] = 0;
+                v_bits_unpacked[6] = 0;
+                v_bits_unpacked[7] = 0;
+              }
+            }
+          } else if (self->private_impl.f_color_type == 4) {
+            if (4 <= ((uint64_t)(v_s.len))) {
+              v_bits_unpacked[0] = v_s.ptr[1];
+              v_bits_unpacked[1] = v_s.ptr[0];
+              v_bits_unpacked[2] = v_s.ptr[1];
+              v_bits_unpacked[3] = v_s.ptr[0];
+              v_bits_unpacked[4] = v_s.ptr[1];
+              v_bits_unpacked[5] = v_s.ptr[0];
+              v_bits_unpacked[6] = v_s.ptr[3];
+              v_bits_unpacked[7] = v_s.ptr[2];
+              v_s = wuffs_base__slice_u8__subslice_i(v_s, 4);
+            }
+          } else {
+            if (8 <= ((uint64_t)(v_s.len))) {
+              v_bits_unpacked[0] = v_s.ptr[5];
+              v_bits_unpacked[1] = v_s.ptr[4];
+              v_bits_unpacked[2] = v_s.ptr[3];
+              v_bits_unpacked[3] = v_s.ptr[2];
+              v_bits_unpacked[4] = v_s.ptr[1];
+              v_bits_unpacked[5] = v_s.ptr[0];
+              v_bits_unpacked[6] = v_s.ptr[7];
+              v_bits_unpacked[7] = v_s.ptr[6];
+              v_s = wuffs_base__slice_u8__subslice_i(v_s, 8);
+            }
+          }
+          wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, wuffs_base__slice_u8__subslice_i(v_dst, v_i), v_dst_palette, wuffs_base__make_slice_u8(v_bits_unpacked, 8));
+        }
+        v_x += (((uint32_t)(1)) << WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][0]);
+      }
+    }
+    v_prev_row = v_curr_row;
+    v_y += (((uint32_t)(1)) << WUFFS_PNG__INTERLACING[self->private_impl.f_interlace_pass][3]);
+  }
+  return wuffs_base__make_status(NULL);
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__PNG)
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__WBMP)
+
+// ---------------- Status Codes Implementations
+
+const char wuffs_wbmp__error__bad_header[] = "#wbmp: bad header";
+
+// ---------------- Private Consts
+
+// ---------------- Private Initializer Prototypes
+
+// ---------------- Private Function Prototypes
+
+// ---------------- VTables
+
+const wuffs_base__image_decoder__func_ptrs
+wuffs_wbmp__decoder__func_ptrs_for__wuffs_base__image_decoder = {
+  (wuffs_base__status(*)(void*,
+      wuffs_base__pixel_buffer*,
+      wuffs_base__io_buffer*,
+      wuffs_base__pixel_blend,
+      wuffs_base__slice_u8,
+      wuffs_base__decode_frame_options*))(&wuffs_wbmp__decoder__decode_frame),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__frame_config*,
+      wuffs_base__io_buffer*))(&wuffs_wbmp__decoder__decode_frame_config),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__image_config*,
+      wuffs_base__io_buffer*))(&wuffs_wbmp__decoder__decode_image_config),
+  (wuffs_base__rect_ie_u32(*)(const void*))(&wuffs_wbmp__decoder__frame_dirty_rect),
+  (uint32_t(*)(const void*))(&wuffs_wbmp__decoder__num_animation_loops),
+  (uint64_t(*)(const void*))(&wuffs_wbmp__decoder__num_decoded_frame_configs),
+  (uint64_t(*)(const void*))(&wuffs_wbmp__decoder__num_decoded_frames),
+  (wuffs_base__status(*)(void*,
+      uint64_t,
+      uint64_t))(&wuffs_wbmp__decoder__restart_frame),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_wbmp__decoder__set_quirk_enabled),
+  (wuffs_base__empty_struct(*)(void*,
+      uint32_t,
+      bool))(&wuffs_wbmp__decoder__set_report_metadata),
+  (wuffs_base__status(*)(void*,
+      wuffs_base__io_buffer*,
+      wuffs_base__more_information*,
+      wuffs_base__io_buffer*))(&wuffs_wbmp__decoder__tell_me_more),
+  (wuffs_base__range_ii_u64(*)(const void*))(&wuffs_wbmp__decoder__workbuf_len),
+};
+
+// ---------------- Initializer Implementations
+
+wuffs_base__status WUFFS_BASE__WARN_UNUSED_RESULT
+wuffs_wbmp__decoder__initialize(
+    wuffs_wbmp__decoder* self,
+    size_t sizeof_star_self,
+    uint64_t wuffs_version,
+    uint32_t options){
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (sizeof(*self) != sizeof_star_self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_sizeof_receiver);
+  }
+  if (((wuffs_version >> 32) != WUFFS_VERSION_MAJOR) ||
+      (((wuffs_version >> 16) & 0xFFFF) > WUFFS_VERSION_MINOR)) {
+    return wuffs_base__make_status(wuffs_base__error__bad_wuffs_version);
+  }
+
+  if ((options & WUFFS_INITIALIZE__ALREADY_ZEROED) != 0) {
+    // The whole point of this if-check is to detect an uninitialized *self.
+    // We disable the warning on GCC. Clang-5.0 does not have this warning.
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
+    if (self->private_impl.magic != 0) {
+      return wuffs_base__make_status(wuffs_base__error__initialize_falsely_claimed_already_zeroed);
+    }
+#if !defined(__clang__) && defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+  } else {
+    if ((options & WUFFS_INITIALIZE__LEAVE_INTERNAL_BUFFERS_UNINITIALIZED) == 0) {
+      memset(self, 0, sizeof(*self));
+      options |= WUFFS_INITIALIZE__ALREADY_ZEROED;
+    } else {
+      memset(&(self->private_impl), 0, sizeof(self->private_impl));
+    }
+  }
+
+  self->private_impl.magic = WUFFS_BASE__MAGIC;
+  self->private_impl.vtable_for__wuffs_base__image_decoder.vtable_name =
+      wuffs_base__image_decoder__vtable_name;
+  self->private_impl.vtable_for__wuffs_base__image_decoder.function_pointers =
+      (const void*)(&wuffs_wbmp__decoder__func_ptrs_for__wuffs_base__image_decoder);
+  return wuffs_base__make_status(NULL);
+}
+
+wuffs_wbmp__decoder*
+wuffs_wbmp__decoder__alloc() {
+  wuffs_wbmp__decoder* x =
+      (wuffs_wbmp__decoder*)(calloc(sizeof(wuffs_wbmp__decoder), 1));
+  if (!x) {
+    return NULL;
+  }
+  if (wuffs_wbmp__decoder__initialize(
+      x, sizeof(wuffs_wbmp__decoder), WUFFS_VERSION, WUFFS_INITIALIZE__ALREADY_ZEROED).repr) {
+    free(x);
+    return NULL;
+  }
+  return x;
+}
+
+size_t
+sizeof__wuffs_wbmp__decoder() {
+  return sizeof(wuffs_wbmp__decoder);
+}
+
+// ---------------- Function Implementations
+
+// -------- func wbmp.decoder.set_quirk_enabled
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_wbmp__decoder__set_quirk_enabled(
+    wuffs_wbmp__decoder* self,
+    uint32_t a_quirk,
+    bool a_enabled) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func wbmp.decoder.decode_image_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_wbmp__decoder__decode_image_config(
+    wuffs_wbmp__decoder* self,
+    wuffs_base__image_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 1)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  uint8_t v_c = 0;
+  uint32_t v_i = 0;
+  uint32_t v_x32 = 0;
+  uint64_t v_x64 = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_image_config[0];
+  if (coro_susp_point) {
+    v_i = self->private_data.s_decode_image_config[0].v_i;
+    v_x32 = self->private_data.s_decode_image_config[0].v_x32;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence != 0) {
+      status = wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+      goto exit;
+    }
+    v_i = 0;
+    while (v_i < 2) {
+      {
+        WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+        if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+          status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+          goto suspend;
+        }
+        uint8_t t_0 = *iop_a_src++;
+        v_c = t_0;
+      }
+      if (v_c != 0) {
+        status = wuffs_base__make_status(wuffs_wbmp__error__bad_header);
+        goto exit;
+      }
+      v_i += 1;
+    }
+    v_i = 0;
+    while (v_i < 2) {
+      v_x32 = 0;
+      while (true) {
+        {
+          WUFFS_BASE__COROUTINE_SUSPENSION_POINT(2);
+          if (WUFFS_BASE__UNLIKELY(iop_a_src == io2_a_src)) {
+            status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+            goto suspend;
+          }
+          uint8_t t_1 = *iop_a_src++;
+          v_c = t_1;
+        }
+        v_x32 |= ((uint32_t)((v_c & 127)));
+        if ((v_c >> 7) == 0) {
+          goto label__0__break;
+        }
+        v_x64 = (((uint64_t)(v_x32)) << 7);
+        if (v_x64 > 4294967295) {
+          status = wuffs_base__make_status(wuffs_wbmp__error__bad_header);
+          goto exit;
+        }
+        v_x32 = ((uint32_t)(v_x64));
+      }
+      label__0__break:;
+      if (v_i == 0) {
+        self->private_impl.f_width = v_x32;
+      } else {
+        self->private_impl.f_height = v_x32;
+      }
+      v_i += 1;
+    }
+    self->private_impl.f_frame_config_io_position = wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)));
+    if (a_dst != NULL) {
+      wuffs_base__image_config__set(
+          a_dst,
+          2198077448,
+          0,
+          self->private_impl.f_width,
+          self->private_impl.f_height,
+          self->private_impl.f_frame_config_io_position,
+          true);
+    }
+    self->private_impl.f_call_sequence = 3;
+
+    goto ok;
+    ok:
+    self->private_impl.p_decode_image_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_image_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 1 : 0;
+  self->private_data.s_decode_image_config[0].v_i = v_i;
+  self->private_data.s_decode_image_config[0].v_x32 = v_x32;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func wbmp.decoder.decode_frame_config
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_wbmp__decoder__decode_frame_config(
+    wuffs_wbmp__decoder* self,
+    wuffs_base__frame_config* a_dst,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 2)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame_config[0];
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence < 3) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_wbmp__decoder__decode_image_config(self, NULL, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+    } else if (self->private_impl.f_call_sequence == 3) {
+      if (self->private_impl.f_frame_config_io_position != wuffs_base__u64__sat_add((a_src ? a_src->meta.pos : 0), ((uint64_t)(iop_a_src - io0_a_src)))) {
+        status = wuffs_base__make_status(wuffs_base__error__bad_restart);
+        goto exit;
+      }
+    } else if (self->private_impl.f_call_sequence == 4) {
+      self->private_impl.f_call_sequence = 255;
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    } else {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    }
+    if (a_dst != NULL) {
+      wuffs_base__frame_config__set(
+          a_dst,
+          wuffs_base__utility__make_rect_ie_u32(
+          0,
+          0,
+          self->private_impl.f_width,
+          self->private_impl.f_height),
+          ((wuffs_base__flicks)(0)),
+          0,
+          self->private_impl.f_frame_config_io_position,
+          0,
+          true,
+          false,
+          4278190080);
+    }
+    self->private_impl.f_call_sequence = 4;
+
+    ok:
+    self->private_impl.p_decode_frame_config[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_frame_config[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 2 : 0;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func wbmp.decoder.decode_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_wbmp__decoder__decode_frame(
+    wuffs_wbmp__decoder* self,
+    wuffs_base__pixel_buffer* a_dst,
+    wuffs_base__io_buffer* a_src,
+    wuffs_base__pixel_blend a_blend,
+    wuffs_base__slice_u8 a_workbuf,
+    wuffs_base__decode_frame_options* a_opts) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 3)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  wuffs_base__status v_status = wuffs_base__make_status(NULL);
+  wuffs_base__pixel_format v_dst_pixfmt = {0};
+  uint32_t v_dst_bits_per_pixel = 0;
+  uint64_t v_dst_bytes_per_pixel = 0;
+  uint64_t v_dst_x_in_bytes = 0;
+  uint32_t v_dst_x = 0;
+  uint32_t v_dst_y = 0;
+  wuffs_base__table_u8 v_tab = {0};
+  wuffs_base__slice_u8 v_dst = {0};
+  uint8_t v_src[1] = {0};
+  uint8_t v_c = 0;
+
+  const uint8_t* iop_a_src = NULL;
+  const uint8_t* io0_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io1_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  const uint8_t* io2_a_src WUFFS_BASE__POTENTIALLY_UNUSED = NULL;
+  if (a_src) {
+    io0_a_src = a_src->data.ptr;
+    io1_a_src = io0_a_src + a_src->meta.ri;
+    iop_a_src = io1_a_src;
+    io2_a_src = io0_a_src + a_src->meta.wi;
+  }
+
+  uint32_t coro_susp_point = self->private_impl.p_decode_frame[0];
+  if (coro_susp_point) {
+    v_dst_bytes_per_pixel = self->private_data.s_decode_frame[0].v_dst_bytes_per_pixel;
+    v_dst_x = self->private_data.s_decode_frame[0].v_dst_x;
+    v_dst_y = self->private_data.s_decode_frame[0].v_dst_y;
+    memcpy(v_src, self->private_data.s_decode_frame[0].v_src, sizeof(v_src));
+    v_c = self->private_data.s_decode_frame[0].v_c;
+  }
+  switch (coro_susp_point) {
+    WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
+
+    if (self->private_impl.f_call_sequence < 4) {
+      if (a_src) {
+        a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+      }
+      WUFFS_BASE__COROUTINE_SUSPENSION_POINT(1);
+      status = wuffs_wbmp__decoder__decode_frame_config(self, NULL, a_src);
+      if (a_src) {
+        iop_a_src = a_src->data.ptr + a_src->meta.ri;
+      }
+      if (status.repr) {
+        goto suspend;
+      }
+    } else if (self->private_impl.f_call_sequence == 4) {
+    } else {
+      status = wuffs_base__make_status(wuffs_base__note__end_of_data);
+      goto ok;
+    }
+    v_status = wuffs_base__pixel_swizzler__prepare(&self->private_impl.f_swizzler,
+        wuffs_base__pixel_buffer__pixel_format(a_dst),
+        wuffs_base__pixel_buffer__palette(a_dst),
+        wuffs_base__utility__make_pixel_format(536870920),
+        wuffs_base__utility__empty_slice_u8(),
+        a_blend);
+    if ( ! wuffs_base__status__is_ok(&v_status)) {
+      status = v_status;
+      if (wuffs_base__status__is_error(&status)) {
+        goto exit;
+      } else if (wuffs_base__status__is_suspension(&status)) {
+        status = wuffs_base__make_status(wuffs_base__error__cannot_return_a_suspension);
+        goto exit;
+      }
+      goto ok;
+    }
+    v_dst_pixfmt = wuffs_base__pixel_buffer__pixel_format(a_dst);
+    v_dst_bits_per_pixel = wuffs_base__pixel_format__bits_per_pixel(&v_dst_pixfmt);
+    if ((v_dst_bits_per_pixel & 7) != 0) {
+      status = wuffs_base__make_status(wuffs_base__error__unsupported_option);
+      goto exit;
+    }
+    v_dst_bytes_per_pixel = ((uint64_t)((v_dst_bits_per_pixel / 8)));
+    if (self->private_impl.f_width > 0) {
+      v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
+      while (v_dst_y < self->private_impl.f_height) {
+        v_dst = wuffs_base__table_u8__row_u32(v_tab, v_dst_y);
+        v_dst_x = 0;
+        while (v_dst_x < self->private_impl.f_width) {
+          if ((v_dst_x & 7) == 0) {
+            while (((uint64_t)(io2_a_src - iop_a_src)) <= 0) {
+              status = wuffs_base__make_status(wuffs_base__suspension__short_read);
+              WUFFS_BASE__COROUTINE_SUSPENSION_POINT_MAYBE_SUSPEND(2);
+              v_tab = wuffs_base__pixel_buffer__plane(a_dst, 0);
+              v_dst = wuffs_base__table_u8__row_u32(v_tab, v_dst_y);
+              v_dst_x_in_bytes = (((uint64_t)(v_dst_x)) * v_dst_bytes_per_pixel);
+              if (v_dst_x_in_bytes <= ((uint64_t)(v_dst.len))) {
+                v_dst = wuffs_base__slice_u8__subslice_i(v_dst, v_dst_x_in_bytes);
+              }
+            }
+            v_c = wuffs_base__peek_u8be__no_bounds_check(iop_a_src);
+            iop_a_src += 1;
+          }
+          if ((v_c & 128) == 0) {
+            v_src[0] = 0;
+          } else {
+            v_src[0] = 255;
+          }
+          v_c = ((uint8_t)(((((uint32_t)(v_c)) << 1) & 255)));
+          wuffs_base__pixel_swizzler__swizzle_interleaved_from_slice(&self->private_impl.f_swizzler, v_dst, wuffs_base__utility__empty_slice_u8(), wuffs_base__make_slice_u8(v_src, 1));
+          if (v_dst_bytes_per_pixel <= ((uint64_t)(v_dst.len))) {
+            v_dst = wuffs_base__slice_u8__subslice_i(v_dst, v_dst_bytes_per_pixel);
+          }
+          v_dst_x += 1;
+        }
+        v_dst_y += 1;
+      }
+    }
+    self->private_impl.f_call_sequence = 255;
+
+    ok:
+    self->private_impl.p_decode_frame[0] = 0;
+    goto exit;
+  }
+
+  goto suspend;
+  suspend:
+  self->private_impl.p_decode_frame[0] = wuffs_base__status__is_suspension(&status) ? coro_susp_point : 0;
+  self->private_impl.active_coroutine = wuffs_base__status__is_suspension(&status) ? 3 : 0;
+  self->private_data.s_decode_frame[0].v_dst_bytes_per_pixel = v_dst_bytes_per_pixel;
+  self->private_data.s_decode_frame[0].v_dst_x = v_dst_x;
+  self->private_data.s_decode_frame[0].v_dst_y = v_dst_y;
+  memcpy(self->private_data.s_decode_frame[0].v_src, v_src, sizeof(v_src));
+  self->private_data.s_decode_frame[0].v_c = v_c;
+
+  goto exit;
+  exit:
+  if (a_src) {
+    a_src->meta.ri = ((size_t)(iop_a_src - a_src->data.ptr));
+  }
+
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func wbmp.decoder.frame_dirty_rect
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__rect_ie_u32
+wuffs_wbmp__decoder__frame_dirty_rect(
+    const wuffs_wbmp__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_rect_ie_u32();
+  }
+
+  return wuffs_base__utility__make_rect_ie_u32(
+      0,
+      0,
+      self->private_impl.f_width,
+      self->private_impl.f_height);
+}
+
+// -------- func wbmp.decoder.num_animation_loops
+
+WUFFS_BASE__MAYBE_STATIC uint32_t
+wuffs_wbmp__decoder__num_animation_loops(
+    const wuffs_wbmp__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  return 0;
+}
+
+// -------- func wbmp.decoder.num_decoded_frame_configs
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_wbmp__decoder__num_decoded_frame_configs(
+    const wuffs_wbmp__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  if (self->private_impl.f_call_sequence > 3) {
+    return 1;
+  }
+  return 0;
+}
+
+// -------- func wbmp.decoder.num_decoded_frames
+
+WUFFS_BASE__MAYBE_STATIC uint64_t
+wuffs_wbmp__decoder__num_decoded_frames(
+    const wuffs_wbmp__decoder* self) {
+  if (!self) {
+    return 0;
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return 0;
+  }
+
+  if (self->private_impl.f_call_sequence > 4) {
+    return 1;
+  }
+  return 0;
+}
+
+// -------- func wbmp.decoder.restart_frame
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_wbmp__decoder__restart_frame(
+    wuffs_wbmp__decoder* self,
+    uint64_t a_index,
+    uint64_t a_io_position) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+
+  if (self->private_impl.f_call_sequence < 3) {
+    return wuffs_base__make_status(wuffs_base__error__bad_call_sequence);
+  }
+  if (a_index != 0) {
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  self->private_impl.f_call_sequence = 3;
+  self->private_impl.f_frame_config_io_position = a_io_position;
+  return wuffs_base__make_status(NULL);
+}
+
+// -------- func wbmp.decoder.set_report_metadata
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__empty_struct
+wuffs_wbmp__decoder__set_report_metadata(
+    wuffs_wbmp__decoder* self,
+    uint32_t a_fourcc,
+    bool a_report) {
+  return wuffs_base__make_empty_struct();
+}
+
+// -------- func wbmp.decoder.tell_me_more
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__status
+wuffs_wbmp__decoder__tell_me_more(
+    wuffs_wbmp__decoder* self,
+    wuffs_base__io_buffer* a_dst,
+    wuffs_base__more_information* a_minfo,
+    wuffs_base__io_buffer* a_src) {
+  if (!self) {
+    return wuffs_base__make_status(wuffs_base__error__bad_receiver);
+  }
+  if (self->private_impl.magic != WUFFS_BASE__MAGIC) {
+    return wuffs_base__make_status(
+        (self->private_impl.magic == WUFFS_BASE__DISABLED)
+        ? wuffs_base__error__disabled_by_previous_error
+        : wuffs_base__error__initialize_not_called);
+  }
+  if (!a_dst || !a_src) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__bad_argument);
+  }
+  if ((self->private_impl.active_coroutine != 0) &&
+      (self->private_impl.active_coroutine != 4)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+    return wuffs_base__make_status(wuffs_base__error__interleaved_coroutine_calls);
+  }
+  self->private_impl.active_coroutine = 0;
+  wuffs_base__status status = wuffs_base__make_status(NULL);
+
+  status = wuffs_base__make_status(wuffs_base__error__no_more_information);
+  goto exit;
+
+  goto ok;
+  ok:
+  goto exit;
+  exit:
+  if (wuffs_base__status__is_error(&status)) {
+    self->private_impl.magic = WUFFS_BASE__DISABLED;
+  }
+  return status;
+}
+
+// -------- func wbmp.decoder.workbuf_len
+
+WUFFS_BASE__MAYBE_STATIC wuffs_base__range_ii_u64
+wuffs_wbmp__decoder__workbuf_len(
+    const wuffs_wbmp__decoder* self) {
+  if (!self) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+  if ((self->private_impl.magic != WUFFS_BASE__MAGIC) &&
+      (self->private_impl.magic != WUFFS_BASE__DISABLED)) {
+    return wuffs_base__utility__empty_range_ii_u64();
+  }
+
+  return wuffs_base__utility__make_range_ii_u64(0, 0);
+}
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__WBMP)
+
+#if defined(__cplusplus) && defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+// ---------------- Auxiliary - Base
+
+// Auxiliary code is discussed at
+// https://github.com/google/wuffs/blob/main/doc/note/auxiliary-code.md
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__AUX__BASE)
+
+namespace wuffs_aux {
+
+namespace sync_io {
+
+// --------
+
+DynIOBuffer::DynIOBuffer(uint64_t max_incl)
+    : m_buf(wuffs_base__empty_io_buffer()), m_max_incl(max_incl) {}
+
+DynIOBuffer::~DynIOBuffer() {
+  if (m_buf.data.ptr) {
+    free(m_buf.data.ptr);
+  }
+}
+
+void  //
+DynIOBuffer::drop() {
+  if (m_buf.data.ptr) {
+    free(m_buf.data.ptr);
+  }
+  m_buf = wuffs_base__empty_io_buffer();
+}
+
+DynIOBuffer::GrowResult  //
+DynIOBuffer::grow(uint64_t min_incl) {
+  uint64_t n = round_up(min_incl, m_max_incl);
+  if (n == 0) {
+    return ((min_incl == 0) && (m_max_incl == 0))
+               ? DynIOBuffer::GrowResult::OK
+               : DynIOBuffer::GrowResult::FailedMaxInclExceeded;
+  } else if (n > m_buf.data.len) {
+    uint8_t* ptr = static_cast<uint8_t*>(realloc(m_buf.data.ptr, n));
+    if (!ptr) {
+      return DynIOBuffer::GrowResult::FailedOutOfMemory;
+    }
+    m_buf.data.ptr = ptr;
+    m_buf.data.len = n;
+  }
+  return DynIOBuffer::GrowResult::OK;
+}
+
+// round_up rounds min_incl up, returning the smallest value x satisfying
+// (min_incl <= x) and (x <= max_incl) and some other constraints. It returns 0
+// if there is no such x.
+//
+// When max_incl <= 4096, the other constraints are:
+//  - (x == max_incl)
+//
+// When max_incl >  4096, the other constraints are:
+//  - (x == max_incl) or (x is a power of 2)
+//  - (x >= 4096)
+uint64_t  //
+DynIOBuffer::round_up(uint64_t min_incl, uint64_t max_incl) {
+  if (min_incl > max_incl) {
+    return 0;
+  }
+  uint64_t n = 4096;
+  if (n >= max_incl) {
+    return max_incl;
+  }
+  while (n < min_incl) {
+    if (n >= (max_incl / 2)) {
+      return max_incl;
+    }
+    n *= 2;
+  }
+  return n;
+}
+
+// --------
+
+Input::~Input() {}
+
+IOBuffer*  //
+Input::BringsItsOwnIOBuffer() {
+  return nullptr;
+}
+
+// --------
+
+FileInput::FileInput(FILE* f) : m_f(f) {}
+
+std::string  //
+FileInput::CopyIn(IOBuffer* dst) {
+  if (!m_f) {
+    return "wuffs_aux::sync_io::FileInput: nullptr file";
+  } else if (!dst) {
+    return "wuffs_aux::sync_io::FileInput: nullptr IOBuffer";
+  } else if (dst->meta.closed) {
+    return "wuffs_aux::sync_io::FileInput: end of file";
+  } else {
+    dst->compact();
+    size_t n = fread(dst->writer_pointer(), 1, dst->writer_length(), m_f);
+    dst->meta.wi += n;
+    dst->meta.closed = feof(m_f);
+    if (ferror(m_f)) {
+      return "wuffs_aux::sync_io::FileInput: error reading file";
+    }
+  }
+  return "";
+}
+
+// --------
+
+MemoryInput::MemoryInput(const char* ptr, size_t len)
+    : m_io(wuffs_base__ptr_u8__reader(
+          static_cast<uint8_t*>(static_cast<void*>(const_cast<char*>(ptr))),
+          len,
+          true)) {}
+
+MemoryInput::MemoryInput(const uint8_t* ptr, size_t len)
+    : m_io(wuffs_base__ptr_u8__reader(const_cast<uint8_t*>(ptr), len, true)) {}
+
+IOBuffer*  //
+MemoryInput::BringsItsOwnIOBuffer() {
+  return &m_io;
+}
+
+std::string  //
+MemoryInput::CopyIn(IOBuffer* dst) {
+  if (!dst) {
+    return "wuffs_aux::sync_io::MemoryInput: nullptr IOBuffer";
+  } else if (dst->meta.closed) {
+    return "wuffs_aux::sync_io::MemoryInput: end of file";
+  } else if (wuffs_base__slice_u8__overlaps(dst->data, m_io.data)) {
+    // Treat m_io's data as immutable, so don't compact dst or otherwise write
+    // to it.
+    return "wuffs_aux::sync_io::MemoryInput: overlapping buffers";
+  } else {
+    dst->compact();
+    size_t nd = dst->writer_length();
+    size_t ns = m_io.reader_length();
+    size_t n = (nd < ns) ? nd : ns;
+    memcpy(dst->writer_pointer(), m_io.reader_pointer(), n);
+    m_io.meta.ri += n;
+    dst->meta.wi += n;
+    dst->meta.closed = m_io.reader_length() == 0;
+  }
+  return "";
+}
+
+// --------
+
+}  // namespace sync_io
+
+namespace private_impl {
+
+struct ErrorMessages {
+  const char* max_incl_metadata_length_exceeded;
+  const char* out_of_memory;
+  const char* unexpected_end_of_file;
+  const char* unsupported_metadata;
+  const char* unsupported_negative_advance;
+
+  // If adding new "const char*" typed fields to this struct, either add them
+  // after existing fields or, if re-ordering fields, make sure that you update
+  // all of the "const private_impl::ErrorMessages FooBarErrorMessages" values
+  // in all of the sibling *.cc files.
+
+  static inline const char* resolve(const char* s) {
+    return s ? s : "wuffs_aux::private_impl: unknown error";
+  };
+};
+
+std::string  //
+AdvanceIOBufferTo(const ErrorMessages& error_messages,
+                  sync_io::Input& input,
+                  IOBuffer& io_buf,
+                  uint64_t absolute_position) {
+  if (absolute_position < io_buf.reader_position()) {
+    return error_messages.resolve(error_messages.unsupported_negative_advance);
+  }
+  while (true) {
+    uint64_t relative_position = absolute_position - io_buf.reader_position();
+    if (relative_position <= io_buf.reader_length()) {
+      io_buf.meta.ri += (size_t)relative_position;
+      break;
+    } else if (io_buf.meta.closed) {
+      return error_messages.resolve(error_messages.unexpected_end_of_file);
+    }
+    io_buf.meta.ri = io_buf.meta.wi;
+    if (!input.BringsItsOwnIOBuffer()) {
+      io_buf.compact();
+    }
+    std::string error_message = input.CopyIn(&io_buf);
+    if (!error_message.empty()) {
+      return error_message;
+    }
+  }
+  return "";
+}
+
+std::string  //
+HandleMetadata(
+    const ErrorMessages& error_messages,
+    sync_io::Input& input,
+    wuffs_base__io_buffer& io_buf,
+    sync_io::DynIOBuffer& raw,
+    wuffs_base__status (*tell_me_more_func)(void*,
+                                            wuffs_base__io_buffer*,
+                                            wuffs_base__more_information*,
+                                            wuffs_base__io_buffer*),
+    void* tell_me_more_receiver,
+    std::string (*handle_metadata_func)(void*,
+                                        const wuffs_base__more_information*,
+                                        wuffs_base__slice_u8),
+    void* handle_metadata_receiver) {
+  wuffs_base__more_information minfo = wuffs_base__empty_more_information();
+  // Reset raw but keep its backing array (the raw.m_buf.data slice).
+  raw.m_buf.meta = wuffs_base__empty_io_buffer_meta();
+
+  while (true) {
+    minfo = wuffs_base__empty_more_information();
+    wuffs_base__status status = (*tell_me_more_func)(
+        tell_me_more_receiver, &raw.m_buf, &minfo, &io_buf);
+    switch (minfo.flavor) {
+      case 0:
+      case WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_TRANSFORM:
+      case WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_PARSED:
+        break;
+
+      case WUFFS_BASE__MORE_INFORMATION__FLAVOR__METADATA_RAW_PASSTHROUGH: {
+        wuffs_base__range_ie_u64 r = minfo.metadata_raw_passthrough__range();
+        if (r.is_empty()) {
+          break;
+        }
+        uint64_t num_to_copy = r.length();
+        if (num_to_copy > (raw.m_max_incl - raw.m_buf.meta.wi)) {
+          return error_messages.resolve(
+              error_messages.max_incl_metadata_length_exceeded);
+        } else if (num_to_copy > (raw.m_buf.data.len - raw.m_buf.meta.wi)) {
+          switch (raw.grow(num_to_copy + raw.m_buf.meta.wi)) {
+            case sync_io::DynIOBuffer::GrowResult::OK:
+              break;
+            case sync_io::DynIOBuffer::GrowResult::FailedMaxInclExceeded:
+              return error_messages.resolve(
+                  error_messages.max_incl_metadata_length_exceeded);
+            case sync_io::DynIOBuffer::GrowResult::FailedOutOfMemory:
+              return error_messages.resolve(error_messages.out_of_memory);
+          }
+        }
+
+        if (io_buf.reader_position() > r.min_incl) {
+          return error_messages.resolve(error_messages.unsupported_metadata);
+        } else {
+          std::string error_message =
+              AdvanceIOBufferTo(error_messages, input, io_buf, r.min_incl);
+          if (!error_message.empty()) {
+            return error_message;
+          }
+        }
+
+        while (true) {
+          uint64_t n =
+              wuffs_base__u64__min(num_to_copy, io_buf.reader_length());
+          memcpy(raw.m_buf.writer_pointer(), io_buf.reader_pointer(), n);
+          raw.m_buf.meta.wi += n;
+          io_buf.meta.ri += n;
+          num_to_copy -= n;
+          if (num_to_copy == 0) {
+            break;
+          } else if (io_buf.meta.closed) {
+            return error_messages.resolve(
+                error_messages.unexpected_end_of_file);
+          } else if (!input.BringsItsOwnIOBuffer()) {
+            io_buf.compact();
+          }
+          std::string error_message = input.CopyIn(&io_buf);
+          if (!error_message.empty()) {
+            return error_message;
+          }
+        }
+        break;
+      }
+
+      default:
+        return error_messages.resolve(error_messages.unsupported_metadata);
+    }
+
+    if (status.repr == nullptr) {
+      break;
+    } else if (status.repr != wuffs_base__suspension__even_more_information) {
+      if (status.repr != wuffs_base__suspension__short_write) {
+        return status.message();
+      }
+      switch (raw.grow(wuffs_base__u64__sat_add(raw.m_buf.data.len, 1))) {
+        case sync_io::DynIOBuffer::GrowResult::OK:
+          break;
+        case sync_io::DynIOBuffer::GrowResult::FailedMaxInclExceeded:
+          return error_messages.resolve(
+              error_messages.max_incl_metadata_length_exceeded);
+        case sync_io::DynIOBuffer::GrowResult::FailedOutOfMemory:
+          return error_messages.resolve(error_messages.out_of_memory);
+      }
+    }
+  }
+
+  return (*handle_metadata_func)(handle_metadata_receiver, &minfo,
+                                 raw.m_buf.reader_slice());
+}
+
+}  // namespace private_impl
+
+}  // namespace wuffs_aux
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__AUX__BASE)
+
+// ---------------- Auxiliary - CBOR
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__AUX__CBOR)
+
+#include <utility>
+
+namespace wuffs_aux {
+
+DecodeCborResult::DecodeCborResult(std::string&& error_message0,
+                                   uint64_t cursor_position0)
+    : error_message(std::move(error_message0)),
+      cursor_position(cursor_position0) {}
+
+DecodeCborCallbacks::~DecodeCborCallbacks() {}
+
+void  //
+DecodeCborCallbacks::Done(DecodeCborResult& result,
+                          sync_io::Input& input,
+                          IOBuffer& buffer) {}
+
+DecodeCborArgQuirks::DecodeCborArgQuirks(wuffs_base__slice_u32 repr0)
+    : repr(repr0) {}
+
+DecodeCborArgQuirks::DecodeCborArgQuirks(uint32_t* ptr0, size_t len0)
+    : repr(wuffs_base__make_slice_u32(ptr0, len0)) {}
+
+DecodeCborArgQuirks  //
+DecodeCborArgQuirks::DefaultValue() {
+  return DecodeCborArgQuirks(wuffs_base__empty_slice_u32());
+}
+
+DecodeCborResult  //
+DecodeCbor(DecodeCborCallbacks& callbacks,
+           sync_io::Input& input,
+           DecodeCborArgQuirks quirks) {
+  // Prepare the wuffs_base__io_buffer and the resultant error_message.
+  wuffs_base__io_buffer* io_buf = input.BringsItsOwnIOBuffer();
+  wuffs_base__io_buffer fallback_io_buf = wuffs_base__empty_io_buffer();
+  std::unique_ptr<uint8_t[]> fallback_io_array(nullptr);
+  if (!io_buf) {
+    fallback_io_array = std::unique_ptr<uint8_t[]>(new uint8_t[4096]);
+    fallback_io_buf = wuffs_base__ptr_u8__writer(fallback_io_array.get(), 4096);
+    io_buf = &fallback_io_buf;
+  }
+  // cursor_index is discussed at
+  // https://nigeltao.github.io/blog/2020/jsonptr.html#the-cursor-index
+  size_t cursor_index = 0;
+  std::string ret_error_message;
+  std::string io_error_message;
+
+  do {
+    // Prepare the low-level CBOR decoder.
+    wuffs_cbor__decoder::unique_ptr dec = wuffs_cbor__decoder::alloc();
+    if (!dec) {
+      ret_error_message = "wuffs_aux::DecodeCbor: out of memory";
+      goto done;
+    }
+    for (size_t i = 0; i < quirks.repr.len; i++) {
+      dec->set_quirk_enabled(quirks.repr.ptr[i], true);
+    }
+
+    // Prepare the wuffs_base__tok_buffer. 256 tokens is 2KiB.
+    wuffs_base__token tok_array[256];
+    wuffs_base__token_buffer tok_buf =
+        wuffs_base__slice_token__writer(wuffs_base__make_slice_token(
+            &tok_array[0], (sizeof(tok_array) / sizeof(tok_array[0]))));
+    wuffs_base__status tok_status = wuffs_base__make_status(nullptr);
+
+    // Prepare other state.
+    int32_t depth = 0;
+    std::string str;
+    int64_t extension_category = 0;
+    uint64_t extension_detail = 0;
+
+    // Valid token's VBCs range in 0 ..= 15. Values over that are for tokens
+    // from outside of the base package, such as the CBOR package.
+    constexpr int64_t EXT_CAT__CBOR_TAG = 16;
+
+    // Loop, doing these two things:
+    //  1. Get the next token.
+    //  2. Process that token.
+    while (true) {
+      // 1. Get the next token.
+
+      while (tok_buf.meta.ri >= tok_buf.meta.wi) {
+        if (tok_status.repr == nullptr) {
+          // No-op.
+        } else if (tok_status.repr == wuffs_base__suspension__short_write) {
+          tok_buf.compact();
+        } else if (tok_status.repr == wuffs_base__suspension__short_read) {
+          // Read from input to io_buf.
+          if (!io_error_message.empty()) {
+            ret_error_message = std::move(io_error_message);
+            goto done;
+          } else if (cursor_index != io_buf->meta.ri) {
+            ret_error_message =
+                "wuffs_aux::DecodeCbor: internal error: bad cursor_index";
+            goto done;
+          } else if (io_buf->meta.closed) {
+            ret_error_message =
+                "wuffs_aux::DecodeCbor: internal error: io_buf is closed";
+            goto done;
+          }
+          io_buf->compact();
+          if (io_buf->meta.wi >= io_buf->data.len) {
+            ret_error_message =
+                "wuffs_aux::DecodeCbor: internal error: io_buf is full";
+            goto done;
+          }
+          cursor_index = io_buf->meta.ri;
+          io_error_message = input.CopyIn(io_buf);
+        } else {
+          ret_error_message = tok_status.message();
+          goto done;
+        }
+
+        if (WUFFS_CBOR__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE != 0) {
+          ret_error_message =
+              "wuffs_aux::DecodeCbor: internal error: bad WORKBUF_LEN";
+          goto done;
+        }
+        wuffs_base__slice_u8 work_buf = wuffs_base__empty_slice_u8();
+        tok_status = dec->decode_tokens(&tok_buf, io_buf, work_buf);
+        if ((tok_buf.meta.ri > tok_buf.meta.wi) ||
+            (tok_buf.meta.wi > tok_buf.data.len) ||
+            (io_buf->meta.ri > io_buf->meta.wi) ||
+            (io_buf->meta.wi > io_buf->data.len)) {
+          ret_error_message =
+              "wuffs_aux::DecodeCbor: internal error: bad buffer indexes";
+          goto done;
+        }
+      }
+
+      wuffs_base__token token = tok_buf.data.ptr[tok_buf.meta.ri++];
+      uint64_t token_len = token.length();
+      if ((io_buf->meta.ri < cursor_index) ||
+          ((io_buf->meta.ri - cursor_index) < token_len)) {
+        ret_error_message =
+            "wuffs_aux::DecodeCbor: internal error: bad token indexes";
+        goto done;
+      }
+      uint8_t* token_ptr = io_buf->data.ptr + cursor_index;
+      cursor_index += static_cast<size_t>(token_len);
+
+      // 2. Process that token.
+
+      uint64_t vbd = token.value_base_detail();
+
+      if (extension_category != 0) {
+        int64_t ext = token.value_extension();
+        if ((ext >= 0) && !token.continued()) {
+          extension_detail = (extension_detail
+                              << WUFFS_BASE__TOKEN__VALUE_EXTENSION__NUM_BITS) |
+                             static_cast<uint64_t>(ext);
+          switch (extension_category) {
+            case WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_SIGNED:
+              extension_category = 0;
+              ret_error_message =
+                  callbacks.AppendI64(static_cast<int64_t>(extension_detail));
+              goto parsed_a_value;
+            case WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_UNSIGNED:
+              extension_category = 0;
+              ret_error_message = callbacks.AppendU64(extension_detail);
+              goto parsed_a_value;
+            case EXT_CAT__CBOR_TAG:
+              extension_category = 0;
+              ret_error_message = callbacks.AppendCborTag(extension_detail);
+              if (!ret_error_message.empty()) {
+                goto done;
+              }
+              continue;
+          }
+        }
+        ret_error_message =
+            "wuffs_aux::DecodeCbor: internal error: bad extended token";
+        goto done;
+      }
+
+      switch (token.value_base_category()) {
+        case WUFFS_BASE__TOKEN__VBC__FILLER:
+          continue;
+
+        case WUFFS_BASE__TOKEN__VBC__STRUCTURE: {
+          if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH) {
+            ret_error_message = callbacks.Push(static_cast<uint32_t>(vbd));
+            if (!ret_error_message.empty()) {
+              goto done;
+            }
+            depth++;
+            if (depth > WUFFS_CBOR__DECODER_DEPTH_MAX_INCL) {
+              ret_error_message =
+                  "wuffs_aux::DecodeCbor: internal error: bad depth";
+              goto done;
+            }
+            continue;
+          }
+          ret_error_message = callbacks.Pop(static_cast<uint32_t>(vbd));
+          depth--;
+          if (depth < 0) {
+            ret_error_message =
+                "wuffs_aux::DecodeCbor: internal error: bad depth";
+            goto done;
+          }
+          goto parsed_a_value;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__STRING: {
+          if (vbd & WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_0_DST_1_SRC_DROP) {
+            // No-op.
+          } else if (vbd &
+                     WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_1_SRC_COPY) {
+            const char* ptr =  // Convert from (uint8_t*).
+                static_cast<const char*>(static_cast<void*>(token_ptr));
+            str.append(ptr, static_cast<size_t>(token_len));
+          } else {
+            goto fail;
+          }
+          if (token.continued()) {
+            continue;
+          }
+          ret_error_message =
+              (vbd & WUFFS_BASE__TOKEN__VBD__STRING__CHAIN_MUST_BE_UTF_8)
+                  ? callbacks.AppendTextString(std::move(str))
+                  : callbacks.AppendByteString(std::move(str));
+          str.clear();
+          goto parsed_a_value;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__UNICODE_CODE_POINT: {
+          uint8_t u[WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL];
+          size_t n = wuffs_base__utf_8__encode(
+              wuffs_base__make_slice_u8(
+                  &u[0], WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL),
+              static_cast<uint32_t>(vbd));
+          const char* ptr =  // Convert from (uint8_t*).
+              static_cast<const char*>(static_cast<void*>(&u[0]));
+          str.append(ptr, n);
+          if (token.continued()) {
+            continue;
+          }
+          goto fail;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__LITERAL: {
+          if (vbd & WUFFS_BASE__TOKEN__VBD__LITERAL__NULL) {
+            ret_error_message = callbacks.AppendNull();
+          } else if (vbd & WUFFS_BASE__TOKEN__VBD__LITERAL__UNDEFINED) {
+            ret_error_message = callbacks.AppendUndefined();
+          } else {
+            ret_error_message = callbacks.AppendBool(
+                vbd & WUFFS_BASE__TOKEN__VBD__LITERAL__TRUE);
+          }
+          goto parsed_a_value;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__NUMBER: {
+          const uint64_t cfp_fbbe_fifb =
+              WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_FLOATING_POINT |
+              WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_BINARY_BIG_ENDIAN |
+              WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_IGNORE_FIRST_BYTE;
+          if ((vbd & cfp_fbbe_fifb) == cfp_fbbe_fifb) {
+            double f;
+            switch (token_len) {
+              case 3:
+                f = wuffs_base__ieee_754_bit_representation__from_u16_to_f64(
+                    wuffs_base__peek_u16be__no_bounds_check(token_ptr + 1));
+                break;
+              case 5:
+                f = wuffs_base__ieee_754_bit_representation__from_u32_to_f64(
+                    wuffs_base__peek_u32be__no_bounds_check(token_ptr + 1));
+                break;
+              case 9:
+                f = wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
+                    wuffs_base__peek_u64be__no_bounds_check(token_ptr + 1));
+                break;
+              default:
+                goto fail;
+            }
+            ret_error_message = callbacks.AppendF64(f);
+            goto parsed_a_value;
+          }
+          goto fail;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_SIGNED: {
+          if (token.continued()) {
+            extension_category = WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_SIGNED;
+            extension_detail =
+                static_cast<uint64_t>(token.value_base_detail__sign_extended());
+            continue;
+          }
+          ret_error_message =
+              callbacks.AppendI64(token.value_base_detail__sign_extended());
+          goto parsed_a_value;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_UNSIGNED: {
+          if (token.continued()) {
+            extension_category =
+                WUFFS_BASE__TOKEN__VBC__INLINE_INTEGER_UNSIGNED;
+            extension_detail = vbd;
+            continue;
+          }
+          ret_error_message = callbacks.AppendU64(vbd);
+          goto parsed_a_value;
+        }
+      }
+
+      if (token.value_major() == WUFFS_CBOR__TOKEN_VALUE_MAJOR) {
+        uint64_t value_minor = token.value_minor();
+        if (value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__MINUS_1_MINUS_X) {
+          if (token_len == 9) {
+            ret_error_message = callbacks.AppendMinus1MinusX(
+                wuffs_base__peek_u64be__no_bounds_check(token_ptr + 1));
+            goto parsed_a_value;
+          }
+        } else if (value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__SIMPLE_VALUE) {
+          ret_error_message =
+              callbacks.AppendCborSimpleValue(static_cast<uint8_t>(
+                  value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__DETAIL_MASK));
+          goto parsed_a_value;
+        } else if (value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__TAG) {
+          if (token.continued()) {
+            extension_category = EXT_CAT__CBOR_TAG;
+            extension_detail =
+                value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__DETAIL_MASK;
+            continue;
+          }
+          ret_error_message = callbacks.AppendCborTag(
+              value_minor & WUFFS_CBOR__TOKEN_VALUE_MINOR__DETAIL_MASK);
+          if (!ret_error_message.empty()) {
+            goto done;
+          }
+          continue;
+        }
+      }
+
+    fail:
+      ret_error_message =
+          "wuffs_aux::DecodeCbor: internal error: unexpected token";
+      goto done;
+
+    parsed_a_value:
+      if (!ret_error_message.empty() || (depth == 0)) {
+        goto done;
+      }
+    }
+  } while (false);
+
+done:
+  DecodeCborResult result(
+      std::move(ret_error_message),
+      wuffs_base__u64__sat_add(io_buf->meta.pos, cursor_index));
+  callbacks.Done(result, input, *io_buf);
+  return result;
+}
+
+}  // namespace wuffs_aux
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__AUX__CBOR)
+
+// ---------------- Auxiliary - Image
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__AUX__IMAGE)
+
+#include <utility>
+
+namespace wuffs_aux {
+
+DecodeImageResult::DecodeImageResult(MemOwner&& pixbuf_mem_owner0,
+                                     wuffs_base__pixel_buffer pixbuf0,
+                                     std::string&& error_message0)
+    : pixbuf_mem_owner(std::move(pixbuf_mem_owner0)),
+      pixbuf(pixbuf0),
+      error_message(std::move(error_message0)) {}
+
+DecodeImageResult::DecodeImageResult(std::string&& error_message0)
+    : pixbuf_mem_owner(nullptr, &free),
+      pixbuf(wuffs_base__null_pixel_buffer()),
+      error_message(std::move(error_message0)) {}
+
+DecodeImageCallbacks::~DecodeImageCallbacks() {}
+
+DecodeImageCallbacks::AllocPixbufResult::AllocPixbufResult(
+    MemOwner&& mem_owner0,
+    wuffs_base__pixel_buffer pixbuf0)
+    : mem_owner(std::move(mem_owner0)), pixbuf(pixbuf0), error_message("") {}
+
+DecodeImageCallbacks::AllocPixbufResult::AllocPixbufResult(
+    std::string&& error_message0)
+    : mem_owner(nullptr, &free),
+      pixbuf(wuffs_base__null_pixel_buffer()),
+      error_message(std::move(error_message0)) {}
+
+DecodeImageCallbacks::AllocWorkbufResult::AllocWorkbufResult(
+    MemOwner&& mem_owner0,
+    wuffs_base__slice_u8 workbuf0)
+    : mem_owner(std::move(mem_owner0)), workbuf(workbuf0), error_message("") {}
+
+DecodeImageCallbacks::AllocWorkbufResult::AllocWorkbufResult(
+    std::string&& error_message0)
+    : mem_owner(nullptr, &free),
+      workbuf(wuffs_base__empty_slice_u8()),
+      error_message(std::move(error_message0)) {}
+
+wuffs_base__image_decoder::unique_ptr  //
+DecodeImageCallbacks::SelectDecoder(uint32_t fourcc,
+                                    wuffs_base__slice_u8 prefix) {
+  switch (fourcc) {
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__BMP)
+    case WUFFS_BASE__FOURCC__BMP:
+      return wuffs_bmp__decoder::alloc_as__wuffs_base__image_decoder();
+#endif
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__GIF)
+    case WUFFS_BASE__FOURCC__GIF:
+      return wuffs_gif__decoder::alloc_as__wuffs_base__image_decoder();
+#endif
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__NIE)
+    case WUFFS_BASE__FOURCC__NIE:
+      return wuffs_nie__decoder::alloc_as__wuffs_base__image_decoder();
+#endif
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__PNG)
+    case WUFFS_BASE__FOURCC__PNG: {
+      auto dec = wuffs_png__decoder::alloc_as__wuffs_base__image_decoder();
+      // Favor faster decodes over rejecting invalid checksums.
+      dec->set_quirk_enabled(WUFFS_BASE__QUIRK_IGNORE_CHECKSUM, true);
+      return dec;
+    }
+#endif
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__WBMP)
+    case WUFFS_BASE__FOURCC__WBMP:
+      return wuffs_wbmp__decoder::alloc_as__wuffs_base__image_decoder();
+#endif
+  }
+
+  return wuffs_base__image_decoder::unique_ptr(nullptr, &free);
+}
+
+std::string  //
+DecodeImageCallbacks::HandleMetadata(const wuffs_base__more_information& minfo,
+                                     wuffs_base__slice_u8 raw) {
+  return "";
+}
+
+wuffs_base__pixel_format  //
+DecodeImageCallbacks::SelectPixfmt(
+    const wuffs_base__image_config& image_config) {
+  return wuffs_base__make_pixel_format(WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL);
+}
+
+DecodeImageCallbacks::AllocPixbufResult  //
+DecodeImageCallbacks::AllocPixbuf(const wuffs_base__image_config& image_config,
+                                  bool allow_uninitialized_memory) {
+  uint32_t w = image_config.pixcfg.width();
+  uint32_t h = image_config.pixcfg.height();
+  if ((w == 0) || (h == 0)) {
+    return AllocPixbufResult("");
+  }
+  uint64_t len = image_config.pixcfg.pixbuf_len();
+  if ((len == 0) || (SIZE_MAX < len)) {
+    return AllocPixbufResult(DecodeImage_UnsupportedPixelConfiguration);
+  }
+  void* ptr =
+      allow_uninitialized_memory ? malloc((size_t)len) : calloc((size_t)len, 1);
+  if (!ptr) {
+    return AllocPixbufResult(DecodeImage_OutOfMemory);
+  }
+  wuffs_base__pixel_buffer pixbuf;
+  wuffs_base__status status = pixbuf.set_from_slice(
+      &image_config.pixcfg,
+      wuffs_base__make_slice_u8((uint8_t*)ptr, (size_t)len));
+  if (!status.is_ok()) {
+    free(ptr);
+    return AllocPixbufResult(status.message());
+  }
+  return AllocPixbufResult(MemOwner(ptr, &free), pixbuf);
+}
+
+DecodeImageCallbacks::AllocWorkbufResult  //
+DecodeImageCallbacks::AllocWorkbuf(wuffs_base__range_ii_u64 len_range,
+                                   bool allow_uninitialized_memory) {
+  uint64_t len = len_range.max_incl;
+  if (len == 0) {
+    return AllocWorkbufResult("");
+  } else if (SIZE_MAX < len) {
+    return AllocWorkbufResult(DecodeImage_OutOfMemory);
+  }
+  void* ptr =
+      allow_uninitialized_memory ? malloc((size_t)len) : calloc((size_t)len, 1);
+  if (!ptr) {
+    return AllocWorkbufResult(DecodeImage_OutOfMemory);
+  }
+  return AllocWorkbufResult(
+      MemOwner(ptr, &free),
+      wuffs_base__make_slice_u8((uint8_t*)ptr, (size_t)len));
+}
+
+void  //
+DecodeImageCallbacks::Done(
+    DecodeImageResult& result,
+    sync_io::Input& input,
+    IOBuffer& buffer,
+    wuffs_base__image_decoder::unique_ptr image_decoder) {}
+
+const char DecodeImage_BufferIsTooShort[] =  //
+    "wuffs_aux::DecodeImage: buffer is too short";
+const char DecodeImage_MaxInclDimensionExceeded[] =  //
+    "wuffs_aux::DecodeImage: max_incl_dimension exceeded";
+const char DecodeImage_MaxInclMetadataLengthExceeded[] =  //
+    "wuffs_aux::DecodeImage: max_incl_metadata_length exceeded";
+const char DecodeImage_OutOfMemory[] =  //
+    "wuffs_aux::DecodeImage: out of memory";
+const char DecodeImage_UnexpectedEndOfFile[] =  //
+    "wuffs_aux::DecodeImage: unexpected end of file";
+const char DecodeImage_UnsupportedImageFormat[] =  //
+    "wuffs_aux::DecodeImage: unsupported image format";
+const char DecodeImage_UnsupportedMetadata[] =  //
+    "wuffs_aux::DecodeImage: unsupported metadata";
+const char DecodeImage_UnsupportedPixelBlend[] =  //
+    "wuffs_aux::DecodeImage: unsupported pixel blend";
+const char DecodeImage_UnsupportedPixelConfiguration[] =  //
+    "wuffs_aux::DecodeImage: unsupported pixel configuration";
+const char DecodeImage_UnsupportedPixelFormat[] =  //
+    "wuffs_aux::DecodeImage: unsupported pixel format";
+
+DecodeImageArgQuirks::DecodeImageArgQuirks(wuffs_base__slice_u32 repr0)
+    : repr(repr0) {}
+
+DecodeImageArgQuirks::DecodeImageArgQuirks(uint32_t* ptr0, size_t len0)
+    : repr(wuffs_base__make_slice_u32(ptr0, len0)) {}
+
+DecodeImageArgQuirks  //
+DecodeImageArgQuirks::DefaultValue() {
+  return DecodeImageArgQuirks(wuffs_base__empty_slice_u32());
+}
+
+DecodeImageArgFlags::DecodeImageArgFlags(uint64_t repr0) : repr(repr0) {}
+
+DecodeImageArgFlags  //
+DecodeImageArgFlags::DefaultValue() {
+  return DecodeImageArgFlags(0);
+}
+
+DecodeImageArgPixelBlend::DecodeImageArgPixelBlend(
+    wuffs_base__pixel_blend repr0)
+    : repr(repr0) {}
+
+DecodeImageArgPixelBlend  //
+DecodeImageArgPixelBlend::DefaultValue() {
+  return DecodeImageArgPixelBlend(WUFFS_BASE__PIXEL_BLEND__SRC);
+}
+
+DecodeImageArgBackgroundColor::DecodeImageArgBackgroundColor(
+    wuffs_base__color_u32_argb_premul repr0)
+    : repr(repr0) {}
+
+DecodeImageArgBackgroundColor  //
+DecodeImageArgBackgroundColor::DefaultValue() {
+  return DecodeImageArgBackgroundColor(1);
+}
+
+DecodeImageArgMaxInclDimension::DecodeImageArgMaxInclDimension(uint32_t repr0)
+    : repr(repr0) {}
+
+DecodeImageArgMaxInclDimension  //
+DecodeImageArgMaxInclDimension::DefaultValue() {
+  return DecodeImageArgMaxInclDimension(1048575);
+}
+
+DecodeImageArgMaxInclMetadataLength::DecodeImageArgMaxInclMetadataLength(
+    uint64_t repr0)
+    : repr(repr0) {}
+
+DecodeImageArgMaxInclMetadataLength  //
+DecodeImageArgMaxInclMetadataLength::DefaultValue() {
+  return DecodeImageArgMaxInclMetadataLength(16777215);
+}
+
+// --------
+
+namespace {
+
+const private_impl::ErrorMessages DecodeImageErrorMessages = {
+    DecodeImage_MaxInclMetadataLengthExceeded,  //
+    DecodeImage_OutOfMemory,                    //
+    DecodeImage_UnexpectedEndOfFile,            //
+    DecodeImage_UnsupportedMetadata,            //
+    DecodeImage_UnsupportedImageFormat,         //
+};
+
+std::string  //
+DecodeImageAdvanceIOBufferTo(sync_io::Input& input,
+                             wuffs_base__io_buffer& io_buf,
+                             uint64_t absolute_position) {
+  return private_impl::AdvanceIOBufferTo(DecodeImageErrorMessages, input,
+                                         io_buf, absolute_position);
+}
+
+wuffs_base__status  //
+DIHM0(void* self,
+      wuffs_base__io_buffer* a_dst,
+      wuffs_base__more_information* a_minfo,
+      wuffs_base__io_buffer* a_src) {
+  return wuffs_base__image_decoder__tell_me_more(
+      static_cast<wuffs_base__image_decoder*>(self), a_dst, a_minfo, a_src);
+}
+
+std::string  //
+DIHM1(void* self,
+      const wuffs_base__more_information* minfo,
+      wuffs_base__slice_u8 raw) {
+  return static_cast<DecodeImageCallbacks*>(self)->HandleMetadata(*minfo, raw);
+}
+
+std::string  //
+DecodeImageHandleMetadata(wuffs_base__image_decoder::unique_ptr& image_decoder,
+                          DecodeImageCallbacks& callbacks,
+                          sync_io::Input& input,
+                          wuffs_base__io_buffer& io_buf,
+                          sync_io::DynIOBuffer& raw_metadata_buf) {
+  return private_impl::HandleMetadata(DecodeImageErrorMessages, input, io_buf,
+                                      raw_metadata_buf, DIHM0,
+                                      static_cast<void*>(image_decoder.get()),
+                                      DIHM1, static_cast<void*>(&callbacks));
+}
+
+DecodeImageResult  //
+DecodeImage0(wuffs_base__image_decoder::unique_ptr& image_decoder,
+             DecodeImageCallbacks& callbacks,
+             sync_io::Input& input,
+             wuffs_base__io_buffer& io_buf,
+             wuffs_base__slice_u32 quirks,
+             uint64_t flags,
+             wuffs_base__pixel_blend pixel_blend,
+             wuffs_base__color_u32_argb_premul background_color,
+             uint32_t max_incl_dimension,
+             uint64_t max_incl_metadata_length) {
+  // Check args.
+  switch (pixel_blend) {
+    case WUFFS_BASE__PIXEL_BLEND__SRC:
+    case WUFFS_BASE__PIXEL_BLEND__SRC_OVER:
+      break;
+    default:
+      return DecodeImageResult(DecodeImage_UnsupportedPixelBlend);
+  }
+
+  wuffs_base__image_config image_config = wuffs_base__null_image_config();
+  sync_io::DynIOBuffer raw_metadata_buf(max_incl_metadata_length);
+  uint64_t start_pos = io_buf.reader_position();
+  bool redirected = false;
+  int32_t fourcc = 0;
+redirect:
+  do {
+    // Determine the image format.
+    if (!redirected) {
+      while (true) {
+        fourcc = wuffs_base__magic_number_guess_fourcc(io_buf.reader_slice());
+        if (fourcc > 0) {
+          break;
+        } else if ((fourcc == 0) && (io_buf.reader_length() >= 64)) {
+          break;
+        } else if (io_buf.meta.closed || (io_buf.writer_length() == 0)) {
+          fourcc = 0;
+          break;
+        }
+        std::string error_message = input.CopyIn(&io_buf);
+        if (!error_message.empty()) {
+          return DecodeImageResult(std::move(error_message));
+        }
+      }
+    } else {
+      wuffs_base__io_buffer empty = wuffs_base__empty_io_buffer();
+      wuffs_base__more_information minfo = wuffs_base__empty_more_information();
+      wuffs_base__status tmm_status =
+          image_decoder->tell_me_more(&empty, &minfo, &io_buf);
+      if (tmm_status.repr != nullptr) {
+        return DecodeImageResult(tmm_status.message());
+      }
+      if (minfo.flavor != WUFFS_BASE__MORE_INFORMATION__FLAVOR__IO_REDIRECT) {
+        return DecodeImageResult(DecodeImage_UnsupportedImageFormat);
+      }
+      uint64_t pos = minfo.io_redirect__range().min_incl;
+      if (pos <= start_pos) {
+        // Redirects must go forward.
+        return DecodeImageResult(DecodeImage_UnsupportedImageFormat);
+      }
+      std::string error_message =
+          DecodeImageAdvanceIOBufferTo(input, io_buf, pos);
+      if (!error_message.empty()) {
+        return DecodeImageResult(std::move(error_message));
+      }
+      fourcc = (int32_t)(minfo.io_redirect__fourcc());
+      if (fourcc == 0) {
+        return DecodeImageResult(DecodeImage_UnsupportedImageFormat);
+      }
+      image_decoder.reset();
+    }
+
+    // Select the image decoder.
+    image_decoder = callbacks.SelectDecoder(
+        (uint32_t)fourcc,
+        fourcc ? wuffs_base__empty_slice_u8() : io_buf.reader_slice());
+    if (!image_decoder) {
+      return DecodeImageResult(DecodeImage_UnsupportedImageFormat);
+    }
+
+    // Apply quirks.
+    for (size_t i = 0; i < quirks.len; i++) {
+      image_decoder->set_quirk_enabled(quirks.ptr[i], true);
+    }
+
+    // Apply flags.
+    if (flags != 0) {
+      if (flags & DecodeImageArgFlags::REPORT_METADATA_CHRM) {
+        image_decoder->set_report_metadata(WUFFS_BASE__FOURCC__CHRM, true);
+      }
+      if (flags & DecodeImageArgFlags::REPORT_METADATA_GAMA) {
+        image_decoder->set_report_metadata(WUFFS_BASE__FOURCC__GAMA, true);
+      }
+      if (flags & DecodeImageArgFlags::REPORT_METADATA_ICCP) {
+        image_decoder->set_report_metadata(WUFFS_BASE__FOURCC__ICCP, true);
+      }
+      if (flags & DecodeImageArgFlags::REPORT_METADATA_KVP) {
+        image_decoder->set_report_metadata(WUFFS_BASE__FOURCC__KVP, true);
+      }
+      if (flags & DecodeImageArgFlags::REPORT_METADATA_SRGB) {
+        image_decoder->set_report_metadata(WUFFS_BASE__FOURCC__SRGB, true);
+      }
+      if (flags & DecodeImageArgFlags::REPORT_METADATA_XMP) {
+        image_decoder->set_report_metadata(WUFFS_BASE__FOURCC__XMP, true);
+      }
+    }
+
+    // Decode the image config.
+    while (true) {
+      wuffs_base__status id_dic_status =
+          image_decoder->decode_image_config(&image_config, &io_buf);
+      if (id_dic_status.repr == nullptr) {
+        break;
+      } else if (id_dic_status.repr == wuffs_base__note__i_o_redirect) {
+        if (redirected) {
+          return DecodeImageResult(DecodeImage_UnsupportedImageFormat);
+        }
+        redirected = true;
+        goto redirect;
+      } else if (id_dic_status.repr == wuffs_base__note__metadata_reported) {
+        std::string error_message = DecodeImageHandleMetadata(
+            image_decoder, callbacks, input, io_buf, raw_metadata_buf);
+        if (!error_message.empty()) {
+          return DecodeImageResult(std::move(error_message));
+        }
+      } else if (id_dic_status.repr != wuffs_base__suspension__short_read) {
+        return DecodeImageResult(id_dic_status.message());
+      } else if (io_buf.meta.closed) {
+        return DecodeImageResult(DecodeImage_UnexpectedEndOfFile);
+      } else {
+        std::string error_message = input.CopyIn(&io_buf);
+        if (!error_message.empty()) {
+          return DecodeImageResult(std::move(error_message));
+        }
+      }
+    }
+  } while (false);
+  raw_metadata_buf.drop();
+
+  // Select the pixel format.
+  uint32_t w = image_config.pixcfg.width();
+  uint32_t h = image_config.pixcfg.height();
+  if ((w > max_incl_dimension) || (h > max_incl_dimension)) {
+    return DecodeImageResult(DecodeImage_MaxInclDimensionExceeded);
+  }
+  wuffs_base__pixel_format pixel_format = callbacks.SelectPixfmt(image_config);
+  if (pixel_format.repr != image_config.pixcfg.pixel_format().repr) {
+    switch (pixel_format.repr) {
+      case WUFFS_BASE__PIXEL_FORMAT__BGR_565:
+      case WUFFS_BASE__PIXEL_FORMAT__BGR:
+      case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL:
+      case WUFFS_BASE__PIXEL_FORMAT__BGRA_NONPREMUL_4X16LE:
+      case WUFFS_BASE__PIXEL_FORMAT__BGRA_PREMUL:
+      case WUFFS_BASE__PIXEL_FORMAT__RGBA_NONPREMUL:
+      case WUFFS_BASE__PIXEL_FORMAT__RGBA_PREMUL:
+        break;
+      default:
+        return DecodeImageResult(DecodeImage_UnsupportedPixelFormat);
+    }
+    image_config.pixcfg.set(pixel_format.repr,
+                            WUFFS_BASE__PIXEL_SUBSAMPLING__NONE, w, h);
+  }
+
+  // Allocate the pixel buffer.
+  bool valid_background_color =
+      wuffs_base__color_u32_argb_premul__is_valid(background_color);
+  DecodeImageCallbacks::AllocPixbufResult alloc_pixbuf_result =
+      callbacks.AllocPixbuf(image_config, valid_background_color);
+  if (!alloc_pixbuf_result.error_message.empty()) {
+    return DecodeImageResult(std::move(alloc_pixbuf_result.error_message));
+  }
+  wuffs_base__pixel_buffer pixel_buffer = alloc_pixbuf_result.pixbuf;
+  if (valid_background_color) {
+    wuffs_base__status pb_scufr_status = pixel_buffer.set_color_u32_fill_rect(
+        pixel_buffer.pixcfg.bounds(), background_color);
+    if (pb_scufr_status.repr != nullptr) {
+      return DecodeImageResult(pb_scufr_status.message());
+    }
+  }
+
+  // Allocate the work buffer. Wuffs' decoders conventionally assume that this
+  // can be uninitialized memory.
+  wuffs_base__range_ii_u64 workbuf_len = image_decoder->workbuf_len();
+  DecodeImageCallbacks::AllocWorkbufResult alloc_workbuf_result =
+      callbacks.AllocWorkbuf(workbuf_len, true);
+  if (!alloc_workbuf_result.error_message.empty()) {
+    return DecodeImageResult(std::move(alloc_workbuf_result.error_message));
+  } else if (alloc_workbuf_result.workbuf.len < workbuf_len.min_incl) {
+    return DecodeImageResult(DecodeImage_BufferIsTooShort);
+  }
+
+  // Decode the frame config.
+  wuffs_base__frame_config frame_config = wuffs_base__null_frame_config();
+  while (true) {
+    wuffs_base__status id_dfc_status =
+        image_decoder->decode_frame_config(&frame_config, &io_buf);
+    if (id_dfc_status.repr == nullptr) {
+      break;
+    } else if (id_dfc_status.repr != wuffs_base__suspension__short_read) {
+      return DecodeImageResult(id_dfc_status.message());
+    } else if (io_buf.meta.closed) {
+      return DecodeImageResult(DecodeImage_UnexpectedEndOfFile);
+    } else {
+      std::string error_message = input.CopyIn(&io_buf);
+      if (!error_message.empty()) {
+        return DecodeImageResult(std::move(error_message));
+      }
+    }
+  }
+
+  // Decode the frame (the pixels).
+  //
+  // From here on, always returns the pixel_buffer. If we get this far, we can
+  // still display a partial image, even if we encounter an error.
+  std::string message("");
+  if ((pixel_blend == WUFFS_BASE__PIXEL_BLEND__SRC_OVER) &&
+      frame_config.overwrite_instead_of_blend()) {
+    pixel_blend = WUFFS_BASE__PIXEL_BLEND__SRC;
+  }
+  while (true) {
+    wuffs_base__status id_df_status =
+        image_decoder->decode_frame(&pixel_buffer, &io_buf, pixel_blend,
+                                    alloc_workbuf_result.workbuf, nullptr);
+    if (id_df_status.repr == nullptr) {
+      break;
+    } else if (id_df_status.repr != wuffs_base__suspension__short_read) {
+      message = id_df_status.message();
+      break;
+    } else if (io_buf.meta.closed) {
+      message = DecodeImage_UnexpectedEndOfFile;
+      break;
+    } else {
+      std::string error_message = input.CopyIn(&io_buf);
+      if (!error_message.empty()) {
+        message = std::move(error_message);
+        break;
+      }
+    }
+  }
+  return DecodeImageResult(std::move(alloc_pixbuf_result.mem_owner),
+                           pixel_buffer, std::move(message));
+}
+
+}  // namespace
+
+DecodeImageResult  //
+DecodeImage(DecodeImageCallbacks& callbacks,
+            sync_io::Input& input,
+            DecodeImageArgQuirks quirks,
+            DecodeImageArgFlags flags,
+            DecodeImageArgPixelBlend pixel_blend,
+            DecodeImageArgBackgroundColor background_color,
+            DecodeImageArgMaxInclDimension max_incl_dimension,
+            DecodeImageArgMaxInclMetadataLength max_incl_metadata_length) {
+  wuffs_base__io_buffer* io_buf = input.BringsItsOwnIOBuffer();
+  wuffs_base__io_buffer fallback_io_buf = wuffs_base__empty_io_buffer();
+  std::unique_ptr<uint8_t[]> fallback_io_array(nullptr);
+  if (!io_buf) {
+    fallback_io_array = std::unique_ptr<uint8_t[]>(new uint8_t[32768]);
+    fallback_io_buf =
+        wuffs_base__ptr_u8__writer(fallback_io_array.get(), 32768);
+    io_buf = &fallback_io_buf;
+  }
+
+  wuffs_base__image_decoder::unique_ptr image_decoder(nullptr, &free);
+  DecodeImageResult result =
+      DecodeImage0(image_decoder, callbacks, input, *io_buf, quirks.repr,
+                   flags.repr, pixel_blend.repr, background_color.repr,
+                   max_incl_dimension.repr, max_incl_metadata_length.repr);
+  callbacks.Done(result, input, *io_buf, std::move(image_decoder));
+  return result;
+}
+
+}  // namespace wuffs_aux
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__AUX__IMAGE)
+
+// ---------------- Auxiliary - JSON
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__AUX__JSON)
+
+#include <utility>
+
+namespace wuffs_aux {
+
+DecodeJsonResult::DecodeJsonResult(std::string&& error_message0,
+                                   uint64_t cursor_position0)
+    : error_message(std::move(error_message0)),
+      cursor_position(cursor_position0) {}
+
+DecodeJsonCallbacks::~DecodeJsonCallbacks() {}
+
+void  //
+DecodeJsonCallbacks::Done(DecodeJsonResult& result,
+                          sync_io::Input& input,
+                          IOBuffer& buffer) {}
+
+const char DecodeJson_BadJsonPointer[] =  //
+    "wuffs_aux::DecodeJson: bad JSON Pointer";
+const char DecodeJson_NoMatch[] =  //
+    "wuffs_aux::DecodeJson: no match";
+
+DecodeJsonArgQuirks::DecodeJsonArgQuirks(wuffs_base__slice_u32 repr0)
+    : repr(repr0) {}
+
+DecodeJsonArgQuirks::DecodeJsonArgQuirks(uint32_t* ptr0, size_t len0)
+    : repr(wuffs_base__make_slice_u32(ptr0, len0)) {}
+
+DecodeJsonArgQuirks  //
+DecodeJsonArgQuirks::DefaultValue() {
+  return DecodeJsonArgQuirks(wuffs_base__empty_slice_u32());
+}
+
+DecodeJsonArgJsonPointer::DecodeJsonArgJsonPointer(std::string repr0)
+    : repr(repr0) {}
+
+DecodeJsonArgJsonPointer  //
+DecodeJsonArgJsonPointer::DefaultValue() {
+  return DecodeJsonArgJsonPointer(std::string());
+}
+
+// --------
+
+#define WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN                          \
+  while (tok_buf.meta.ri >= tok_buf.meta.wi) {                              \
+    if (tok_status.repr == nullptr) {                                       \
+      goto done;                                                            \
+    } else if (tok_status.repr == wuffs_base__suspension__short_write) {    \
+      tok_buf.compact();                                                    \
+    } else if (tok_status.repr == wuffs_base__suspension__short_read) {     \
+      if (!io_error_message.empty()) {                                      \
+        ret_error_message = std::move(io_error_message);                    \
+        goto done;                                                          \
+      } else if (cursor_index != io_buf->meta.ri) {                         \
+        ret_error_message =                                                 \
+            "wuffs_aux::DecodeJson: internal error: bad cursor_index";      \
+        goto done;                                                          \
+      } else if (io_buf->meta.closed) {                                     \
+        ret_error_message =                                                 \
+            "wuffs_aux::DecodeJson: internal error: io_buf is closed";      \
+        goto done;                                                          \
+      }                                                                     \
+      io_buf->compact();                                                    \
+      if (io_buf->meta.wi >= io_buf->data.len) {                            \
+        ret_error_message =                                                 \
+            "wuffs_aux::DecodeJson: internal error: io_buf is full";        \
+        goto done;                                                          \
+      }                                                                     \
+      cursor_index = io_buf->meta.ri;                                       \
+      io_error_message = input.CopyIn(io_buf);                              \
+    } else {                                                                \
+      ret_error_message = tok_status.message();                             \
+      goto done;                                                            \
+    }                                                                       \
+    tok_status =                                                            \
+        dec->decode_tokens(&tok_buf, io_buf, wuffs_base__empty_slice_u8()); \
+    if ((tok_buf.meta.ri > tok_buf.meta.wi) ||                              \
+        (tok_buf.meta.wi > tok_buf.data.len) ||                             \
+        (io_buf->meta.ri > io_buf->meta.wi) ||                              \
+        (io_buf->meta.wi > io_buf->data.len)) {                             \
+      ret_error_message =                                                   \
+          "wuffs_aux::DecodeJson: internal error: bad buffer indexes";      \
+      goto done;                                                            \
+    }                                                                       \
+  }                                                                         \
+  wuffs_base__token token = tok_buf.data.ptr[tok_buf.meta.ri++];            \
+  uint64_t token_len = token.length();                                      \
+  if ((io_buf->meta.ri < cursor_index) ||                                   \
+      ((io_buf->meta.ri - cursor_index) < token_len)) {                     \
+    ret_error_message =                                                     \
+        "wuffs_aux::DecodeJson: internal error: bad token indexes";         \
+    goto done;                                                              \
+  }                                                                         \
+  uint8_t* token_ptr = io_buf->data.ptr + cursor_index;                     \
+  (void)(token_ptr);                                                        \
+  cursor_index += static_cast<size_t>(token_len)
+
+// --------
+
+namespace {
+
+// DecodeJson_SplitJsonPointer returns ("bar", 8) for ("/foo/bar/b~1z/qux", 5,
+// etc). It returns a 0 size_t when s has invalid JSON Pointer syntax or i is
+// out of bounds.
+//
+// The string returned is unescaped. If calling it again, this time with i=8,
+// the "b~1z" substring would be returned as "b/z".
+std::pair<std::string, size_t>  //
+DecodeJson_SplitJsonPointer(std::string& s,
+                            size_t i,
+                            bool allow_tilde_n_tilde_r_tilde_t) {
+  std::string fragment;
+  if (i > s.size()) {
+    return std::make_pair(std::string(), 0);
+  }
+  while (i < s.size()) {
+    char c = s[i];
+    if (c == '/') {
+      break;
+    } else if (c != '~') {
+      fragment.push_back(c);
+      i++;
+      continue;
+    }
+    i++;
+    if (i >= s.size()) {
+      return std::make_pair(std::string(), 0);
+    }
+    c = s[i];
+    if (c == '0') {
+      fragment.push_back('~');
+      i++;
+      continue;
+    } else if (c == '1') {
+      fragment.push_back('/');
+      i++;
+      continue;
+    } else if (allow_tilde_n_tilde_r_tilde_t) {
+      if (c == 'n') {
+        fragment.push_back('\n');
+        i++;
+        continue;
+      } else if (c == 'r') {
+        fragment.push_back('\r');
+        i++;
+        continue;
+      } else if (c == 't') {
+        fragment.push_back('\t');
+        i++;
+        continue;
+      }
+    }
+    return std::make_pair(std::string(), 0);
+  }
+  return std::make_pair(std::move(fragment), i);
+}
+
+// --------
+
+std::string  //
+DecodeJson_WalkJsonPointerFragment(wuffs_base__token_buffer& tok_buf,
+                                   wuffs_base__status& tok_status,
+                                   wuffs_json__decoder::unique_ptr& dec,
+                                   wuffs_base__io_buffer* io_buf,
+                                   std::string& io_error_message,
+                                   size_t& cursor_index,
+                                   sync_io::Input& input,
+                                   std::string& json_pointer_fragment) {
+  std::string ret_error_message;
+  while (true) {
+    WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;
+
+    int64_t vbc = token.value_base_category();
+    uint64_t vbd = token.value_base_detail();
+    if (vbc == WUFFS_BASE__TOKEN__VBC__FILLER) {
+      continue;
+    } else if ((vbc != WUFFS_BASE__TOKEN__VBC__STRUCTURE) ||
+               !(vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH)) {
+      return DecodeJson_NoMatch;
+    } else if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__TO_LIST) {
+      goto do_list;
+    }
+    goto do_dict;
+  }
+
+do_dict:
+  // Alternate between these two things:
+  //  1. Decode the next dict key (a string). If it matches the fragment, we're
+  //    done (success). If we've reached the dict's end (VBD__STRUCTURE__POP)
+  //    so that there was no next dict key, we're done (failure).
+  //  2. Otherwise, skip the next dict value.
+  while (true) {
+    for (std::string str; true;) {
+      WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;
+
+      int64_t vbc = token.value_base_category();
+      uint64_t vbd = token.value_base_detail();
+      switch (vbc) {
+        case WUFFS_BASE__TOKEN__VBC__FILLER:
+          continue;
+
+        case WUFFS_BASE__TOKEN__VBC__STRUCTURE:
+          if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH) {
+            goto fail;
+          }
+          return DecodeJson_NoMatch;
+
+        case WUFFS_BASE__TOKEN__VBC__STRING: {
+          if (vbd & WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_0_DST_1_SRC_DROP) {
+            // No-op.
+          } else if (vbd &
+                     WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_1_SRC_COPY) {
+            const char* ptr =  // Convert from (uint8_t*).
+                static_cast<const char*>(static_cast<void*>(token_ptr));
+            str.append(ptr, static_cast<size_t>(token_len));
+          } else {
+            goto fail;
+          }
+          break;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__UNICODE_CODE_POINT: {
+          uint8_t u[WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL];
+          size_t n = wuffs_base__utf_8__encode(
+              wuffs_base__make_slice_u8(
+                  &u[0], WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL),
+              static_cast<uint32_t>(vbd));
+          const char* ptr =  // Convert from (uint8_t*).
+              static_cast<const char*>(static_cast<void*>(&u[0]));
+          str.append(ptr, n);
+          break;
+        }
+
+        default:
+          goto fail;
+      }
+
+      if (token.continued()) {
+        continue;
+      }
+      if (str == json_pointer_fragment) {
+        return "";
+      }
+      goto skip_the_next_dict_value;
+    }
+
+  skip_the_next_dict_value:
+    for (uint32_t skip_depth = 0; true;) {
+      WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;
+
+      int64_t vbc = token.value_base_category();
+      uint64_t vbd = token.value_base_detail();
+      if (token.continued() || (vbc == WUFFS_BASE__TOKEN__VBC__FILLER)) {
+        continue;
+      } else if (vbc == WUFFS_BASE__TOKEN__VBC__STRUCTURE) {
+        if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH) {
+          skip_depth++;
+          continue;
+        }
+        skip_depth--;
+      }
+
+      if (skip_depth == 0) {
+        break;
+      }
+    }  // skip_the_next_dict_value
+  }    // do_dict
+
+do_list:
+  do {
+    wuffs_base__result_u64 result_u64 = wuffs_base__parse_number_u64(
+        wuffs_base__make_slice_u8(
+            static_cast<uint8_t*>(static_cast<void*>(
+                const_cast<char*>(json_pointer_fragment.data()))),
+            json_pointer_fragment.size()),
+        WUFFS_BASE__PARSE_NUMBER_XXX__DEFAULT_OPTIONS);
+    if (!result_u64.status.is_ok()) {
+      return DecodeJson_NoMatch;
+    }
+    uint64_t remaining = result_u64.value;
+    if (remaining == 0) {
+      goto check_that_a_value_follows;
+    }
+    for (uint32_t skip_depth = 0; true;) {
+      WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;
+
+      int64_t vbc = token.value_base_category();
+      uint64_t vbd = token.value_base_detail();
+      if (token.continued() || (vbc == WUFFS_BASE__TOKEN__VBC__FILLER)) {
+        continue;
+      } else if (vbc == WUFFS_BASE__TOKEN__VBC__STRUCTURE) {
+        if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH) {
+          skip_depth++;
+          continue;
+        }
+        if (skip_depth == 0) {
+          return DecodeJson_NoMatch;
+        }
+        skip_depth--;
+      }
+
+      if (skip_depth > 0) {
+        continue;
+      }
+      remaining--;
+      if (remaining == 0) {
+        goto check_that_a_value_follows;
+      }
+    }
+  } while (false);  // do_list
+
+check_that_a_value_follows:
+  while (true) {
+    WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;
+
+    int64_t vbc = token.value_base_category();
+    uint64_t vbd = token.value_base_detail();
+    if (vbc == WUFFS_BASE__TOKEN__VBC__FILLER) {
+      continue;
+    }
+
+    // Undo the last part of WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN, so
+    // that we're only peeking at the next token.
+    tok_buf.meta.ri--;
+    cursor_index -= static_cast<size_t>(token_len);
+
+    if ((vbc == WUFFS_BASE__TOKEN__VBC__STRUCTURE) &&
+        (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__POP)) {
+      return DecodeJson_NoMatch;
+    }
+    return "";
+  }  // check_that_a_value_follows
+
+fail:
+  return "wuffs_aux::DecodeJson: internal error: unexpected token";
+done:
+  return ret_error_message;
+}
+
+}  // namespace
+
+// --------
+
+DecodeJsonResult  //
+DecodeJson(DecodeJsonCallbacks& callbacks,
+           sync_io::Input& input,
+           DecodeJsonArgQuirks quirks,
+           DecodeJsonArgJsonPointer json_pointer) {
+  // Prepare the wuffs_base__io_buffer and the resultant error_message.
+  wuffs_base__io_buffer* io_buf = input.BringsItsOwnIOBuffer();
+  wuffs_base__io_buffer fallback_io_buf = wuffs_base__empty_io_buffer();
+  std::unique_ptr<uint8_t[]> fallback_io_array(nullptr);
+  if (!io_buf) {
+    fallback_io_array = std::unique_ptr<uint8_t[]>(new uint8_t[4096]);
+    fallback_io_buf = wuffs_base__ptr_u8__writer(fallback_io_array.get(), 4096);
+    io_buf = &fallback_io_buf;
+  }
+  // cursor_index is discussed at
+  // https://nigeltao.github.io/blog/2020/jsonptr.html#the-cursor-index
+  size_t cursor_index = 0;
+  std::string ret_error_message;
+  std::string io_error_message;
+
+  do {
+    // Prepare the low-level JSON decoder.
+    wuffs_json__decoder::unique_ptr dec = wuffs_json__decoder::alloc();
+    if (!dec) {
+      ret_error_message = "wuffs_aux::DecodeJson: out of memory";
+      goto done;
+    } else if (WUFFS_JSON__DECODER_WORKBUF_LEN_MAX_INCL_WORST_CASE != 0) {
+      ret_error_message =
+          "wuffs_aux::DecodeJson: internal error: bad WORKBUF_LEN";
+      goto done;
+    }
+    bool allow_tilde_n_tilde_r_tilde_t = false;
+    for (size_t i = 0; i < quirks.repr.len; i++) {
+      dec->set_quirk_enabled(quirks.repr.ptr[i], true);
+      if (quirks.repr.ptr[i] ==
+          WUFFS_JSON__QUIRK_JSON_POINTER_ALLOW_TILDE_N_TILDE_R_TILDE_T) {
+        allow_tilde_n_tilde_r_tilde_t = true;
+      }
+    }
+
+    // Prepare the wuffs_base__tok_buffer. 256 tokens is 2KiB.
+    wuffs_base__token tok_array[256];
+    wuffs_base__token_buffer tok_buf =
+        wuffs_base__slice_token__writer(wuffs_base__make_slice_token(
+            &tok_array[0], (sizeof(tok_array) / sizeof(tok_array[0]))));
+    wuffs_base__status tok_status =
+        dec->decode_tokens(&tok_buf, io_buf, wuffs_base__empty_slice_u8());
+
+    // Prepare other state.
+    int32_t depth = 0;
+    std::string str;
+
+    // Walk the (optional) JSON Pointer.
+    for (size_t i = 0; i < json_pointer.repr.size();) {
+      if (json_pointer.repr[i] != '/') {
+        ret_error_message = DecodeJson_BadJsonPointer;
+        goto done;
+      }
+      std::pair<std::string, size_t> split = DecodeJson_SplitJsonPointer(
+          json_pointer.repr, i + 1, allow_tilde_n_tilde_r_tilde_t);
+      i = split.second;
+      if (i == 0) {
+        ret_error_message = DecodeJson_BadJsonPointer;
+        goto done;
+      }
+      ret_error_message = DecodeJson_WalkJsonPointerFragment(
+          tok_buf, tok_status, dec, io_buf, io_error_message, cursor_index,
+          input, split.first);
+      if (!ret_error_message.empty()) {
+        goto done;
+      }
+    }
+
+    // Loop, doing these two things:
+    //  1. Get the next token.
+    //  2. Process that token.
+    while (true) {
+      WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN;
+
+      int64_t vbc = token.value_base_category();
+      uint64_t vbd = token.value_base_detail();
+      switch (vbc) {
+        case WUFFS_BASE__TOKEN__VBC__FILLER:
+          continue;
+
+        case WUFFS_BASE__TOKEN__VBC__STRUCTURE: {
+          if (vbd & WUFFS_BASE__TOKEN__VBD__STRUCTURE__PUSH) {
+            ret_error_message = callbacks.Push(static_cast<uint32_t>(vbd));
+            if (!ret_error_message.empty()) {
+              goto done;
+            }
+            depth++;
+            if (depth > WUFFS_JSON__DECODER_DEPTH_MAX_INCL) {
+              ret_error_message =
+                  "wuffs_aux::DecodeJson: internal error: bad depth";
+              goto done;
+            }
+            continue;
+          }
+          ret_error_message = callbacks.Pop(static_cast<uint32_t>(vbd));
+          depth--;
+          if (depth < 0) {
+            ret_error_message =
+                "wuffs_aux::DecodeJson: internal error: bad depth";
+            goto done;
+          }
+          goto parsed_a_value;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__STRING: {
+          if (vbd & WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_0_DST_1_SRC_DROP) {
+            // No-op.
+          } else if (vbd &
+                     WUFFS_BASE__TOKEN__VBD__STRING__CONVERT_1_DST_1_SRC_COPY) {
+            const char* ptr =  // Convert from (uint8_t*).
+                static_cast<const char*>(static_cast<void*>(token_ptr));
+            str.append(ptr, static_cast<size_t>(token_len));
+          } else {
+            goto fail;
+          }
+          if (token.continued()) {
+            continue;
+          }
+          ret_error_message = callbacks.AppendTextString(std::move(str));
+          str.clear();
+          goto parsed_a_value;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__UNICODE_CODE_POINT: {
+          uint8_t u[WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL];
+          size_t n = wuffs_base__utf_8__encode(
+              wuffs_base__make_slice_u8(
+                  &u[0], WUFFS_BASE__UTF_8__BYTE_LENGTH__MAX_INCL),
+              static_cast<uint32_t>(vbd));
+          const char* ptr =  // Convert from (uint8_t*).
+              static_cast<const char*>(static_cast<void*>(&u[0]));
+          str.append(ptr, n);
+          if (token.continued()) {
+            continue;
+          }
+          goto fail;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__LITERAL: {
+          ret_error_message =
+              (vbd & WUFFS_BASE__TOKEN__VBD__LITERAL__NULL)
+                  ? callbacks.AppendNull()
+                  : callbacks.AppendBool(vbd &
+                                         WUFFS_BASE__TOKEN__VBD__LITERAL__TRUE);
+          goto parsed_a_value;
+        }
+
+        case WUFFS_BASE__TOKEN__VBC__NUMBER: {
+          if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__FORMAT_TEXT) {
+            if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_INTEGER_SIGNED) {
+              wuffs_base__result_i64 r = wuffs_base__parse_number_i64(
+                  wuffs_base__make_slice_u8(token_ptr,
+                                            static_cast<size_t>(token_len)),
+                  WUFFS_BASE__PARSE_NUMBER_XXX__DEFAULT_OPTIONS);
+              if (r.status.is_ok()) {
+                ret_error_message = callbacks.AppendI64(r.value);
+                goto parsed_a_value;
+              }
+            }
+            if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_FLOATING_POINT) {
+              wuffs_base__result_f64 r = wuffs_base__parse_number_f64(
+                  wuffs_base__make_slice_u8(token_ptr,
+                                            static_cast<size_t>(token_len)),
+                  WUFFS_BASE__PARSE_NUMBER_XXX__DEFAULT_OPTIONS);
+              if (r.status.is_ok()) {
+                ret_error_message = callbacks.AppendF64(r.value);
+                goto parsed_a_value;
+              }
+            }
+          } else if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_NEG_INF) {
+            ret_error_message = callbacks.AppendF64(
+                wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
+                    0xFFF0000000000000ul));
+            goto parsed_a_value;
+          } else if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_POS_INF) {
+            ret_error_message = callbacks.AppendF64(
+                wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
+                    0x7FF0000000000000ul));
+            goto parsed_a_value;
+          } else if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_NEG_NAN) {
+            ret_error_message = callbacks.AppendF64(
+                wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
+                    0xFFFFFFFFFFFFFFFFul));
+            goto parsed_a_value;
+          } else if (vbd & WUFFS_BASE__TOKEN__VBD__NUMBER__CONTENT_POS_NAN) {
+            ret_error_message = callbacks.AppendF64(
+                wuffs_base__ieee_754_bit_representation__from_u64_to_f64(
+                    0x7FFFFFFFFFFFFFFFul));
+            goto parsed_a_value;
+          }
+          goto fail;
+        }
+      }
+
+    fail:
+      ret_error_message =
+          "wuffs_aux::DecodeJson: internal error: unexpected token";
+      goto done;
+
+    parsed_a_value:
+      // If an error was encountered, we are done. Otherwise, (depth == 0)
+      // after parsing a value is equivalent to having decoded the entire JSON
+      // value (for an empty json_pointer query) or having decoded the
+      // pointed-to JSON value (for a non-empty json_pointer query). In the
+      // latter case, we are also done.
+      //
+      // However, if quirks like WUFFS_JSON__QUIRK_ALLOW_TRAILING_FILLER or
+      // WUFFS_JSON__QUIRK_EXPECT_TRAILING_NEW_LINE_OR_EOF are passed, decoding
+      // the entire JSON value should also consume any trailing filler, in case
+      // the DecodeJson caller wants to subsequently check that the input is
+      // completely exhausted (and otherwise raise "valid JSON followed by
+      // further (unexpected) data"). We aren't done yet. Instead, keep the
+      // loop running until WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN's
+      // decode_tokens returns an ok status.
+      if (!ret_error_message.empty() ||
+          ((depth == 0) && !json_pointer.repr.empty())) {
+        goto done;
+      }
+    }
+  } while (false);
+
+done:
+  DecodeJsonResult result(
+      std::move(ret_error_message),
+      wuffs_base__u64__sat_add(io_buf->meta.pos, cursor_index));
+  callbacks.Done(result, input, *io_buf);
+  return result;
+}
+
+#undef WUFFS_AUX__DECODE_JSON__GET_THE_NEXT_TOKEN
+
+}  // namespace wuffs_aux
+
+#endif  // !defined(WUFFS_CONFIG__MODULES) ||
+        // defined(WUFFS_CONFIG__MODULE__AUX__JSON)
+
+#endif  // defined(__cplusplus) && defined(WUFFS_BASE__HAVE_UNIQUE_PTR)
+
+#endif  // WUFFS_IMPLEMENTATION
+
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#elif defined(__clang__)
+#pragma clang diagnostic pop
+#endif
+
+#endif  // WUFFS_INCLUDE_GUARD
diff --git a/script/sync.sh b/script/sync.sh
new file mode 100755
index 0000000..0be4314
--- /dev/null
+++ b/script/sync.sh
@@ -0,0 +1,48 @@
+#!/bin/bash -eu
+# Copyright 2021 The Wuffs-Mirror-Release-C Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# ----------------
+
+# This script synchronizes this repository's release/c directory with the
+# upstream one, assumed to be "../wuffs/release/c", and updates "sync.txt".
+#
+# It does not ensure that ../wuffs is synchronized to the latest version (at
+# https://github.com/google/wuffs). That is a separate responsibility.
+
+echo -n "script/sync.sh ran on " > sync.txt
+date --iso-8601 >> sync.txt
+echo -n "Sibling directory (../wuffs) git revision is " >> sync.txt
+cd ../wuffs
+git rev-parse HEAD >> ../wuffs-mirror-release-c/sync.txt
+cd ../wuffs-mirror-release-c
+echo "Manifest (sha256sum values, filenames, versions):" >> sync.txt
+
+for f in ../wuffs/release/c/*; do
+  f=${f##*/}
+
+  # Skip the unsupported snapshot.
+  if [ $f = "wuffs-unsupported-snapshot.c" ]; then
+    continue
+  fi
+
+  cp ../wuffs/release/c/$f release/c
+  sha256sum release/c/$f >> sync.txt
+  set +e
+  VER=$(grep "^#define WUFFS_VERSION_STRING " release/c/$f)
+  set -e
+  if [ -n "$VER" ]; then
+    echo "    $VER" >> sync.txt
+  fi
+done
diff --git a/sync.txt b/sync.txt
new file mode 100644
index 0000000..d4d4f0d
--- /dev/null
+++ b/sync.txt
@@ -0,0 +1,8 @@
+script/sync.sh ran on 2021-11-18
+Sibling directory (../wuffs) git revision is 66cfd3e02f8c085963ca7ec122500f366226abe3
+Manifest (sha256sum values, filenames, versions):
+bb28889a02c5d89edf6544ded21495462d1f998f8ffa5d095f53ca5db29e2937  release/c/README.md
+3b6a0c78f663bb495d1972fbb2a87c717d70fbac5ea8cc1a50cb9afaa4b03f92  release/c/wuffs-v0.2.c
+    #define WUFFS_VERSION_STRING "0.2.0+2078.20191219"
+ac7913d8fe34d060696df4328ee7ad9c6f6bd730432b0a97d72ebf988564752e  release/c/wuffs-v0.3.c
+    #define WUFFS_VERSION_STRING "0.3.0-beta.11+3198.20211118"