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android / platform / frameworks / base / 2f0fb97c9519cf82377059cd0c03da126fb89b31 / . / libs / androidfw / AssetManager2.cpp
blob: 0cde3d1242c8927af29792beaad06b87876e1ebb [file] [log] [blame]
/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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
*
* http://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.
*/
#define ATRACE_TAG ATRACE_TAG_RESOURCES
#include "androidfw/AssetManager2.h"
#include <algorithm>
#include <iterator>
#include <map>
#include <set>
#include "android-base/logging.h"
#include "android-base/stringprintf.h"
#include "androidfw/ResourceUtils.h"
#include "androidfw/Util.h"
#include "utils/ByteOrder.h"
#include "utils/Trace.h"
#ifdef _WIN32
#ifdef ERROR
#undef ERROR
#endif
#endif
namespace android {
namespace {
using EntryValue = std::variant<Res_value, incfs::verified_map_ptr<ResTable_map_entry>>;
base::expected<EntryValue, IOError> GetEntryValue(
incfs::verified_map_ptr<ResTable_entry> table_entry) {
const uint16_t entry_size = dtohs(table_entry->size);
// Check if the entry represents a bag value.
if (entry_size >= sizeof(ResTable_map_entry) &&
(dtohs(table_entry->flags) & ResTable_entry::FLAG_COMPLEX)) {
const auto map_entry = table_entry.convert<ResTable_map_entry>();
if (!map_entry) {
return base::unexpected(IOError::PAGES_MISSING);
}
return map_entry.verified();
}
// The entry represents a non-bag value.
const auto entry_value = table_entry.offset(entry_size).convert<Res_value>();
if (!entry_value) {
return base::unexpected(IOError::PAGES_MISSING);
}
Res_value value;
value.copyFrom_dtoh(entry_value.value());
return value;
}
} // namespace
struct FindEntryResult {
// The cookie representing the ApkAssets in which the value resides.
ApkAssetsCookie cookie;
// The value of the resource table entry. Either an android::Res_value for non-bag types or an
// incfs::verified_map_ptr<ResTable_map_entry> for bag types.
EntryValue entry;
// The configuration for which the resulting entry was defined. This is already swapped to host
// endianness.
ResTable_config config;
// The bitmask of configuration axis with which the resource value varies.
uint32_t type_flags;
// The dynamic package ID map for the package from which this resource came from.
const DynamicRefTable* dynamic_ref_table;
// The package name of the resource.
const std::string* package_name;
// The string pool reference to the type's name. This uses a different string pool than
// the global string pool, but this is hidden from the caller.
StringPoolRef type_string_ref;
// The string pool reference to the entry's name. This uses a different string pool than
// the global string pool, but this is hidden from the caller.
StringPoolRef entry_string_ref;
};
AssetManager2::AssetManager2() {
memset(&configuration_, 0, sizeof(configuration_));
}
bool AssetManager2::SetApkAssets(std::vector<const ApkAssets*> apk_assets, bool invalidate_caches) {
apk_assets_ = std::move(apk_assets);
BuildDynamicRefTable();
RebuildFilterList();
if (invalidate_caches) {
InvalidateCaches(static_cast<uint32_t>(-1));
}
return true;
}
void AssetManager2::BuildDynamicRefTable() {
package_groups_.clear();
package_ids_.fill(0xff);
// A mapping from path of apk assets that could be target packages of overlays to the runtime
// package id of its first loaded package. Overlays currently can only override resources in the
// first package in the target resource table.
std::unordered_map<std::string, uint8_t> target_assets_package_ids;
// Overlay resources are not directly referenced by an application so their resource ids
// can change throughout the application's lifetime. Assign overlay package ids last.
std::vector<const ApkAssets*> sorted_apk_assets(apk_assets_);
std::stable_partition(sorted_apk_assets.begin(), sorted_apk_assets.end(), [](const ApkAssets* a) {
return !a->IsOverlay();
});
// The assets cookie must map to the position of the apk assets in the unsorted apk assets list.
std::unordered_map<const ApkAssets*, ApkAssetsCookie> apk_assets_cookies;
apk_assets_cookies.reserve(apk_assets_.size());
for (size_t i = 0, n = apk_assets_.size(); i < n; i++) {
apk_assets_cookies[apk_assets_[i]] = static_cast<ApkAssetsCookie>(i);
}
// 0x01 is reserved for the android package.
int next_package_id = 0x02;
for (const ApkAssets* apk_assets : sorted_apk_assets) {
std::shared_ptr<OverlayDynamicRefTable> overlay_ref_table;
if (auto loaded_idmap = apk_assets->GetLoadedIdmap(); loaded_idmap != nullptr) {
// The target package must precede the overlay package in the apk assets paths in order
// to take effect.
auto iter = target_assets_package_ids.find(std::string(loaded_idmap->TargetApkPath()));
if (iter == target_assets_package_ids.end()) {
LOG(INFO) << "failed to find target package for overlay "
<< loaded_idmap->OverlayApkPath();
} else {
uint8_t target_package_id = iter->second;
// Create a special dynamic reference table for the overlay to rewrite references to
// overlay resources as references to the target resources they overlay.
overlay_ref_table = std::make_shared<OverlayDynamicRefTable>(
loaded_idmap->GetOverlayDynamicRefTable(target_package_id));
// Add the overlay resource map to the target package's set of overlays.
const uint8_t target_idx = package_ids_[target_package_id];
CHECK(target_idx != 0xff) << "overlay target '" << loaded_idmap->TargetApkPath()
<< "'added to apk_assets_package_ids but does not have an"
<< " assigned package group";
PackageGroup& target_package_group = package_groups_[target_idx];
target_package_group.overlays_.push_back(
ConfiguredOverlay{loaded_idmap->GetTargetResourcesMap(target_package_id,
overlay_ref_table.get()),
apk_assets_cookies[apk_assets]});
}
}
const LoadedArsc* loaded_arsc = apk_assets->GetLoadedArsc();
for (const std::unique_ptr<const LoadedPackage>& package : loaded_arsc->GetPackages()) {
// Get the package ID or assign one if a shared library.
int package_id;
if (package->IsDynamic()) {
package_id = next_package_id++;
} else {
package_id = package->GetPackageId();
}
uint8_t idx = package_ids_[package_id];
if (idx == 0xff) {
// Add the mapping for package ID to index if not present.
package_ids_[package_id] = idx = static_cast<uint8_t>(package_groups_.size());
PackageGroup& new_group = package_groups_.emplace_back();
if (overlay_ref_table != nullptr) {
// If this package is from an overlay, use a dynamic reference table that can rewrite
// overlay resource ids to their corresponding target resource ids.
new_group.dynamic_ref_table = overlay_ref_table;
}
DynamicRefTable* ref_table = new_group.dynamic_ref_table.get();
ref_table->mAssignedPackageId = package_id;
ref_table->mAppAsLib = package->IsDynamic() && package->GetPackageId() == 0x7f;
}
// Add the package and to the set of packages with the same ID.
PackageGroup* package_group = &package_groups_[idx];
package_group->packages_.push_back(ConfiguredPackage{package.get(), {}});
package_group->cookies_.push_back(apk_assets_cookies[apk_assets]);
// Add the package name -> build time ID mappings.
for (const DynamicPackageEntry& entry : package->GetDynamicPackageMap()) {
String16 package_name(entry.package_name.c_str(), entry.package_name.size());
package_group->dynamic_ref_table->mEntries.replaceValueFor(
package_name, static_cast<uint8_t>(entry.package_id));
}
if (auto apk_assets_path = apk_assets->GetPath()) {
// Overlay target ApkAssets must have been created using path based load apis.
target_assets_package_ids.insert(std::make_pair(std::string(*apk_assets_path), package_id));
}
}
}
// Now assign the runtime IDs so that we have a build-time to runtime ID map.
const auto package_groups_end = package_groups_.end();
for (auto iter = package_groups_.begin(); iter != package_groups_end; ++iter) {
const std::string& package_name = iter->packages_[0].loaded_package_->GetPackageName();
for (auto iter2 = package_groups_.begin(); iter2 != package_groups_end; ++iter2) {
iter2->dynamic_ref_table->addMapping(String16(package_name.c_str(), package_name.size()),
iter->dynamic_ref_table->mAssignedPackageId);
// Add the alias resources to the dynamic reference table of every package group. Since
// staging aliases can only be defined by the framework package (which is not a shared
// library), the compile-time package id of the framework is the same across all packages
// that compile against the framework.
for (const auto& package : iter->packages_) {
for (const auto& entry : package.loaded_package_->GetAliasResourceIdMap()) {
iter2->dynamic_ref_table->addAlias(entry.first, entry.second);
}
}
}
}
}
void AssetManager2::DumpToLog() const {
LOG(INFO) << base::StringPrintf("AssetManager2(this=%p)", this);
std::string list;
for (const auto& apk_assets : apk_assets_) {
base::StringAppendF(&list, "%s,", apk_assets->GetDebugName().c_str());
}
LOG(INFO) << "ApkAssets: " << list;
list = "";
for (size_t i = 0; i < package_ids_.size(); i++) {
if (package_ids_[i] != 0xff) {
base::StringAppendF(&list, "%02x -> %d, ", (int)i, package_ids_[i]);
}
}
LOG(INFO) << "Package ID map: " << list;
for (const auto& package_group: package_groups_) {
list = "";
for (const auto& package : package_group.packages_) {
const LoadedPackage* loaded_package = package.loaded_package_;
base::StringAppendF(&list, "%s(%02x%s), ", loaded_package->GetPackageName().c_str(),
loaded_package->GetPackageId(),
(loaded_package->IsDynamic() ? " dynamic" : ""));
}
LOG(INFO) << base::StringPrintf("PG (%02x): ",
package_group.dynamic_ref_table->mAssignedPackageId)
<< list;
for (size_t i = 0; i < 256; i++) {
if (package_group.dynamic_ref_table->mLookupTable[i] != 0) {
LOG(INFO) << base::StringPrintf(" e[0x%02x] -> 0x%02x", (uint8_t) i,
package_group.dynamic_ref_table->mLookupTable[i]);
}
}
}
}
const ResStringPool* AssetManager2::GetStringPoolForCookie(ApkAssetsCookie cookie) const {
if (cookie < 0 || static_cast<size_t>(cookie) >= apk_assets_.size()) {
return nullptr;
}
return apk_assets_[cookie]->GetLoadedArsc()->GetStringPool();
}
const DynamicRefTable* AssetManager2::GetDynamicRefTableForPackage(uint32_t package_id) const {
if (package_id >= package_ids_.size()) {
return nullptr;
}
const size_t idx = package_ids_[package_id];
if (idx == 0xff) {
return nullptr;
}
return package_groups_[idx].dynamic_ref_table.get();
}
std::shared_ptr<const DynamicRefTable> AssetManager2::GetDynamicRefTableForCookie(
ApkAssetsCookie cookie) const {
for (const PackageGroup& package_group : package_groups_) {
for (const ApkAssetsCookie& package_cookie : package_group.cookies_) {
if (package_cookie == cookie) {
return package_group.dynamic_ref_table;
}
}
}
return nullptr;
}
const std::unordered_map<std::string, std::string>*
AssetManager2::GetOverlayableMapForPackage(uint32_t package_id) const {
if (package_id >= package_ids_.size()) {
return nullptr;
}
const size_t idx = package_ids_[package_id];
if (idx == 0xff) {
return nullptr;
}
const PackageGroup& package_group = package_groups_[idx];
if (package_group.packages_.empty()) {
return nullptr;
}
const auto loaded_package = package_group.packages_[0].loaded_package_;
return &loaded_package->GetOverlayableMap();
}
bool AssetManager2::GetOverlayablesToString(const android::StringPiece& package_name,
std::string* out) const {
uint8_t package_id = 0U;
for (const auto& apk_assets : apk_assets_) {
const LoadedArsc* loaded_arsc = apk_assets->GetLoadedArsc();
if (loaded_arsc == nullptr) {
continue;
}
const auto& loaded_packages = loaded_arsc->GetPackages();
if (loaded_packages.empty()) {
continue;
}
const auto& loaded_package = loaded_packages[0];
if (loaded_package->GetPackageName() == package_name) {
package_id = GetAssignedPackageId(loaded_package.get());
break;
}
}
if (package_id == 0U) {
ANDROID_LOG(ERROR) << base::StringPrintf("No package with name '%s", package_name.data());
return false;
}
const size_t idx = package_ids_[package_id];
if (idx == 0xff) {
return false;
}
std::string output;
for (const ConfiguredPackage& package : package_groups_[idx].packages_) {
const LoadedPackage* loaded_package = package.loaded_package_;
for (auto it = loaded_package->begin(); it != loaded_package->end(); it++) {
const OverlayableInfo* info = loaded_package->GetOverlayableInfo(*it);
if (info != nullptr) {
auto res_name = GetResourceName(*it);
if (!res_name.has_value()) {
ANDROID_LOG(ERROR) << base::StringPrintf(
"Unable to retrieve name of overlayable resource 0x%08x", *it);
return false;
}
const std::string name = ToFormattedResourceString(*res_name);
output.append(base::StringPrintf(
"resource='%s' overlayable='%s' actor='%s' policy='0x%08x'\n",
name.c_str(), info->name.c_str(), info->actor.c_str(), info->policy_flags));
}
}
}
*out = std::move(output);
return true;
}
bool AssetManager2::ContainsAllocatedTable() const {
return std::find_if(apk_assets_.begin(), apk_assets_.end(),
std::mem_fn(&ApkAssets::IsTableAllocated)) != apk_assets_.end();
}
void AssetManager2::SetConfiguration(const ResTable_config& configuration) {
const int diff = configuration_.diff(configuration);
configuration_ = configuration;
if (diff) {
RebuildFilterList();
InvalidateCaches(static_cast<uint32_t>(diff));
}
}
std::set<const ApkAssets*> AssetManager2::GetNonSystemOverlays() const {
std::set<const ApkAssets*> non_system_overlays;
for (const PackageGroup& package_group : package_groups_) {
bool found_system_package = false;
for (const ConfiguredPackage& package : package_group.packages_) {
if (package.loaded_package_->IsSystem()) {
found_system_package = true;
break;
}
}
if (!found_system_package) {
for (const ConfiguredOverlay& overlay : package_group.overlays_) {
non_system_overlays.insert(apk_assets_[overlay.cookie]);
}
}
}
return non_system_overlays;
}
base::expected<std::set<ResTable_config>, IOError> AssetManager2::GetResourceConfigurations(
bool exclude_system, bool exclude_mipmap) const {
ATRACE_NAME("AssetManager::GetResourceConfigurations");
const auto non_system_overlays =
(exclude_system) ? GetNonSystemOverlays() : std::set<const ApkAssets*>();
std::set<ResTable_config> configurations;
for (const PackageGroup& package_group : package_groups_) {
for (size_t i = 0; i < package_group.packages_.size(); i++) {
const ConfiguredPackage& package = package_group.packages_[i];
if (exclude_system && package.loaded_package_->IsSystem()) {
continue;
}
auto apk_assets = apk_assets_[package_group.cookies_[i]];
if (exclude_system && apk_assets->IsOverlay() &&
non_system_overlays.find(apk_assets) == non_system_overlays.end()) {
// Exclude overlays that target system resources.
continue;
}
auto result = package.loaded_package_->CollectConfigurations(exclude_mipmap, &configurations);
if (UNLIKELY(!result.has_value())) {
return base::unexpected(result.error());
}
}
}
return configurations;
}
std::set<std::string> AssetManager2::GetResourceLocales(bool exclude_system,
bool merge_equivalent_languages) const {
ATRACE_NAME("AssetManager::GetResourceLocales");
std::set<std::string> locales;
const auto non_system_overlays =
(exclude_system) ? GetNonSystemOverlays() : std::set<const ApkAssets*>();
for (const PackageGroup& package_group : package_groups_) {
for (size_t i = 0; i < package_group.packages_.size(); i++) {
const ConfiguredPackage& package = package_group.packages_[i];
if (exclude_system && package.loaded_package_->IsSystem()) {
continue;
}
auto apk_assets = apk_assets_[package_group.cookies_[i]];
if (exclude_system && apk_assets->IsOverlay() &&
non_system_overlays.find(apk_assets) == non_system_overlays.end()) {
// Exclude overlays that target system resources.
continue;
}
package.loaded_package_->CollectLocales(merge_equivalent_languages, &locales);
}
}
return locales;
}
std::unique_ptr<Asset> AssetManager2::Open(const std::string& filename,
Asset::AccessMode mode) const {
const std::string new_path = "assets/" + filename;
return OpenNonAsset(new_path, mode);
}
std::unique_ptr<Asset> AssetManager2::Open(const std::string& filename, ApkAssetsCookie cookie,
Asset::AccessMode mode) const {
const std::string new_path = "assets/" + filename;
return OpenNonAsset(new_path, cookie, mode);
}
std::unique_ptr<AssetDir> AssetManager2::OpenDir(const std::string& dirname) const {
ATRACE_NAME("AssetManager::OpenDir");
std::string full_path = "assets/" + dirname;
std::unique_ptr<SortedVector<AssetDir::FileInfo>> files =
util::make_unique<SortedVector<AssetDir::FileInfo>>();
// Start from the back.
for (auto iter = apk_assets_.rbegin(); iter != apk_assets_.rend(); ++iter) {
const ApkAssets* apk_assets = *iter;
if (apk_assets->IsOverlay()) {
continue;
}
auto func = [&](const StringPiece& name, FileType type) {
AssetDir::FileInfo info;
info.setFileName(String8(name.data(), name.size()));
info.setFileType(type);
info.setSourceName(String8(apk_assets->GetDebugName().c_str()));
files->add(info);
};
if (!apk_assets->GetAssetsProvider()->ForEachFile(full_path, func)) {
return {};
}
}
std::unique_ptr<AssetDir> asset_dir = util::make_unique<AssetDir>();
asset_dir->setFileList(files.release());
return asset_dir;
}
// Search in reverse because that's how we used to do it and we need to preserve behaviour.
// This is unfortunate, because ClassLoaders delegate to the parent first, so the order
// is inconsistent for split APKs.
std::unique_ptr<Asset> AssetManager2::OpenNonAsset(const std::string& filename,
Asset::AccessMode mode,
ApkAssetsCookie* out_cookie) const {
for (int32_t i = apk_assets_.size() - 1; i >= 0; i--) {
// Prevent RRO from modifying assets and other entries accessed by file
// path. Explicitly asking for a path in a given package (denoted by a
// cookie) is still OK.
if (apk_assets_[i]->IsOverlay()) {
continue;
}
std::unique_ptr<Asset> asset = apk_assets_[i]->GetAssetsProvider()->Open(filename, mode);
if (asset) {
if (out_cookie != nullptr) {
*out_cookie = i;
}
return asset;
}
}
if (out_cookie != nullptr) {
*out_cookie = kInvalidCookie;
}
return {};
}
std::unique_ptr<Asset> AssetManager2::OpenNonAsset(const std::string& filename,
ApkAssetsCookie cookie,
Asset::AccessMode mode) const {
if (cookie < 0 || static_cast<size_t>(cookie) >= apk_assets_.size()) {
return {};
}
return apk_assets_[cookie]->GetAssetsProvider()->Open(filename, mode);
}
base::expected<FindEntryResult, NullOrIOError> AssetManager2::FindEntry(
uint32_t resid, uint16_t density_override, bool stop_at_first_match,
bool ignore_configuration) const {
const bool logging_enabled = resource_resolution_logging_enabled_;
if (UNLIKELY(logging_enabled)) {
// Clear the last logged resource resolution.
ResetResourceResolution();
last_resolution_.resid = resid;
}
// Might use this if density_override != 0.
ResTable_config density_override_config;
// Select our configuration or generate a density override configuration.
const ResTable_config* desired_config = &configuration_;
if (density_override != 0 && density_override != configuration_.density) {
density_override_config = configuration_;
density_override_config.density = density_override;
desired_config = &density_override_config;
}
// Retrieve the package group from the package id of the resource id.
if (UNLIKELY(!is_valid_resid(resid))) {
LOG(ERROR) << base::StringPrintf("Invalid ID 0x%08x.", resid);
return base::unexpected(std::nullopt);
}
const uint32_t package_id = get_package_id(resid);
const uint8_t type_idx = get_type_id(resid) - 1;
const uint16_t entry_idx = get_entry_id(resid);
uint8_t package_idx = package_ids_[package_id];
if (UNLIKELY(package_idx == 0xff)) {
ANDROID_LOG(ERROR) << base::StringPrintf("No package ID %02x found for ID 0x%08x.",
package_id, resid);
return base::unexpected(std::nullopt);
}
const PackageGroup& package_group = package_groups_[package_idx];
auto result = FindEntryInternal(package_group, type_idx, entry_idx, *desired_config,
stop_at_first_match, ignore_configuration);
if (UNLIKELY(!result.has_value())) {
return base::unexpected(result.error());
}
if (!stop_at_first_match && !ignore_configuration && !apk_assets_[result->cookie]->IsLoader()) {
for (const auto& id_map : package_group.overlays_) {
auto overlay_entry = id_map.overlay_res_maps_.Lookup(resid);
if (!overlay_entry) {
// No id map entry exists for this target resource.
continue;
}
if (overlay_entry.IsInlineValue()) {
// The target resource is overlaid by an inline value not represented by a resource.
result->entry = overlay_entry.GetInlineValue();
result->dynamic_ref_table = id_map.overlay_res_maps_.GetOverlayDynamicRefTable();
result->cookie = id_map.cookie;
if (UNLIKELY(logging_enabled)) {
last_resolution_.steps.push_back(
Resolution::Step{Resolution::Step::Type::OVERLAID_INLINE, String8(), result->cookie});
}
continue;
}
auto overlay_result = FindEntry(overlay_entry.GetResourceId(), density_override,
false /* stop_at_first_match */,
false /* ignore_configuration */);
if (UNLIKELY(IsIOError(overlay_result))) {
return base::unexpected(overlay_result.error());
}
if (!overlay_result.has_value()) {
continue;
}
if (!overlay_result->config.isBetterThan(result->config, desired_config)
&& overlay_result->config.compare(result->config) != 0) {
// The configuration of the entry for the overlay must be equal to or better than the target
// configuration to be chosen as the better value.
continue;
}
result->cookie = overlay_result->cookie;
result->entry = overlay_result->entry;
result->config = overlay_result->config;
result->dynamic_ref_table = id_map.overlay_res_maps_.GetOverlayDynamicRefTable();
if (UNLIKELY(logging_enabled)) {
last_resolution_.steps.push_back(
Resolution::Step{Resolution::Step::Type::OVERLAID, overlay_result->config.toString(),
overlay_result->cookie});
}
}
}
if (UNLIKELY(logging_enabled)) {
last_resolution_.cookie = result->cookie;
last_resolution_.type_string_ref = result->type_string_ref;
last_resolution_.entry_string_ref = result->entry_string_ref;
}
return result;
}
base::expected<FindEntryResult, NullOrIOError> AssetManager2::FindEntryInternal(
const PackageGroup& package_group, uint8_t type_idx, uint16_t entry_idx,
const ResTable_config& desired_config, bool stop_at_first_match,
bool ignore_configuration) const {
const bool logging_enabled = resource_resolution_logging_enabled_;
ApkAssetsCookie best_cookie = kInvalidCookie;
const LoadedPackage* best_package = nullptr;
incfs::verified_map_ptr<ResTable_type> best_type;
const ResTable_config* best_config = nullptr;
uint32_t best_offset = 0U;
uint32_t type_flags = 0U;
std::vector<Resolution::Step> resolution_steps;
// If `desired_config` is not the same as the set configuration or the caller will accept a value
// from any configuration, then we cannot use our filtered list of types since it only it contains
// types matched to the set configuration.
const bool use_filtered = !ignore_configuration && &desired_config == &configuration_;
const size_t package_count = package_group.packages_.size();
for (size_t pi = 0; pi < package_count; pi++) {
const ConfiguredPackage& loaded_package_impl = package_group.packages_[pi];
const LoadedPackage* loaded_package = loaded_package_impl.loaded_package_;
const ApkAssetsCookie cookie = package_group.cookies_[pi];
// If the type IDs are offset in this package, we need to take that into account when searching
// for a type.
const TypeSpec* type_spec = loaded_package->GetTypeSpecByTypeIndex(type_idx);
if (UNLIKELY(type_spec == nullptr)) {
continue;
}
// Allow custom loader packages to overlay resource values with configurations equivalent to the
// current best configuration.
const bool package_is_loader = loaded_package->IsCustomLoader();
auto entry_flags = type_spec->GetFlagsForEntryIndex(entry_idx);
if (UNLIKELY(!entry_flags.has_value())) {
return base::unexpected(entry_flags.error());
}
type_flags |= entry_flags.value();
const FilteredConfigGroup& filtered_group = loaded_package_impl.filtered_configs_[type_idx];
const size_t type_entry_count = (use_filtered) ? filtered_group.type_entries.size()
: type_spec->type_entries.size();
for (size_t i = 0; i < type_entry_count; i++) {
const TypeSpec::TypeEntry* type_entry = (use_filtered) ? filtered_group.type_entries[i]
: &type_spec->type_entries[i];
// We can skip calling ResTable_config::match() if the caller does not care for the
// configuration to match or if we're using the list of types that have already had their
// configuration matched.
const ResTable_config& this_config = type_entry->config;
if (!(use_filtered || ignore_configuration || this_config.match(desired_config))) {
continue;
}
Resolution::Step::Type resolution_type;
if (best_config == nullptr) {
resolution_type = Resolution::Step::Type::INITIAL;
} else if (this_config.isBetterThan(*best_config, &desired_config)) {
resolution_type = Resolution::Step::Type::BETTER_MATCH;
} else if (package_is_loader && this_config.compare(*best_config) == 0) {
resolution_type = Resolution::Step::Type::OVERLAID;
} else {
if (UNLIKELY(logging_enabled)) {
resolution_steps.push_back(Resolution::Step{Resolution::Step::Type::SKIPPED,
this_config.toString(),
cookie});
}
continue;
}
// The configuration matches and is better than the previous selection.
// Find the entry value if it exists for this configuration.
const auto& type = type_entry->type;
const auto offset = LoadedPackage::GetEntryOffset(type, entry_idx);
if (UNLIKELY(IsIOError(offset))) {
return base::unexpected(offset.error());
}
if (!offset.has_value()) {
if (UNLIKELY(logging_enabled)) {
resolution_steps.push_back(Resolution::Step{Resolution::Step::Type::NO_ENTRY,
this_config.toString(),
cookie});
}
continue;
}
best_cookie = cookie;
best_package = loaded_package;
best_type = type;
best_config = &this_config;
best_offset = offset.value();
if (UNLIKELY(logging_enabled)) {
last_resolution_.steps.push_back(Resolution::Step{resolution_type,
this_config.toString(),
cookie});
}
// Any configuration will suffice, so break.
if (stop_at_first_match) {
break;
}
}
}
if (UNLIKELY(best_cookie == kInvalidCookie)) {
return base::unexpected(std::nullopt);
}
auto best_entry_result = LoadedPackage::GetEntryFromOffset(best_type, best_offset);
if (!best_entry_result.has_value()) {
return base::unexpected(best_entry_result.error());
}
const incfs::map_ptr<ResTable_entry> best_entry = *best_entry_result;
if (!best_entry) {
return base::unexpected(IOError::PAGES_MISSING);
}
const auto entry = GetEntryValue(best_entry.verified());
if (!entry.has_value()) {
return base::unexpected(entry.error());
}
return FindEntryResult{
.cookie = best_cookie,
.entry = *entry,
.config = *best_config,
.type_flags = type_flags,
.package_name = &best_package->GetPackageName(),
.type_string_ref = StringPoolRef(best_package->GetTypeStringPool(), best_type->id - 1),
.entry_string_ref = StringPoolRef(best_package->GetKeyStringPool(),
best_entry->key.index),
.dynamic_ref_table = package_group.dynamic_ref_table.get(),
};
}
void AssetManager2::ResetResourceResolution() const {
last_resolution_.cookie = kInvalidCookie;
last_resolution_.resid = 0;
last_resolution_.steps.clear();
last_resolution_.type_string_ref = StringPoolRef();
last_resolution_.entry_string_ref = StringPoolRef();
}
void AssetManager2::SetResourceResolutionLoggingEnabled(bool enabled) {
resource_resolution_logging_enabled_ = enabled;
if (!enabled) {
ResetResourceResolution();
}
}
std::string AssetManager2::GetLastResourceResolution() const {
if (!resource_resolution_logging_enabled_) {
LOG(ERROR) << "Must enable resource resolution logging before getting path.";
return {};
}
const ApkAssetsCookie cookie = last_resolution_.cookie;
if (cookie == kInvalidCookie) {
LOG(ERROR) << "AssetManager hasn't resolved a resource to read resolution path.";
return {};
}
const uint32_t resid = last_resolution_.resid;
const auto package = apk_assets_[cookie]->GetLoadedArsc()->GetPackageById(get_package_id(resid));
std::string resource_name_string;
if (package != nullptr) {
auto resource_name = ToResourceName(last_resolution_.type_string_ref,
last_resolution_.entry_string_ref,
package->GetPackageName());
resource_name_string = resource_name.has_value() ?
ToFormattedResourceString(resource_name.value()) : "<unknown>";
}
std::stringstream log_stream;
log_stream << base::StringPrintf("Resolution for 0x%08x %s\n"
"\tFor config - %s", resid, resource_name_string.c_str(),
configuration_.toString().c_str());
for (const Resolution::Step& step : last_resolution_.steps) {
const static std::unordered_map<Resolution::Step::Type, const char*> kStepStrings = {
{Resolution::Step::Type::INITIAL, "Found initial"},
{Resolution::Step::Type::BETTER_MATCH, "Found better"},
{Resolution::Step::Type::OVERLAID, "Overlaid"},
{Resolution::Step::Type::OVERLAID_INLINE, "Overlaid inline"},
{Resolution::Step::Type::SKIPPED, "Skipped"},
{Resolution::Step::Type::NO_ENTRY, "No entry"}
};
const auto prefix = kStepStrings.find(step.type);
if (prefix == kStepStrings.end()) {
continue;
}
log_stream << "\n\t" << prefix->second << ": " << apk_assets_[step.cookie]->GetDebugName();
if (!step.config_name.isEmpty()) {
log_stream << " - " << step.config_name;
}
}
return log_stream.str();
}
base::expected<AssetManager2::ResourceName, NullOrIOError> AssetManager2::GetResourceName(
uint32_t resid) const {
auto result = FindEntry(resid, 0u /* density_override */, true /* stop_at_first_match */,
true /* ignore_configuration */);
if (!result.has_value()) {
return base::unexpected(result.error());
}
return ToResourceName(result->type_string_ref,
result->entry_string_ref,
*result->package_name);
}
base::expected<uint32_t, NullOrIOError> AssetManager2::GetResourceTypeSpecFlags(
uint32_t resid) const {
auto result = FindEntry(resid, 0u /* density_override */, false /* stop_at_first_match */,
true /* ignore_configuration */);
if (!result.has_value()) {
return base::unexpected(result.error());
}
return result->type_flags;
}
base::expected<AssetManager2::SelectedValue, NullOrIOError> AssetManager2::GetResource(
uint32_t resid, bool may_be_bag, uint16_t density_override) const {
auto result = FindEntry(resid, density_override, false /* stop_at_first_match */,
false /* ignore_configuration */);
if (!result.has_value()) {
return base::unexpected(result.error());
}
auto result_map_entry = std::get_if<incfs::verified_map_ptr<ResTable_map_entry>>(&result->entry);
if (result_map_entry != nullptr) {
if (!may_be_bag) {
LOG(ERROR) << base::StringPrintf("Resource %08x is a complex map type.", resid);
return base::unexpected(std::nullopt);
}
// Create a reference since we can't represent this complex type as a Res_value.
return SelectedValue(Res_value::TYPE_REFERENCE, resid, result->cookie, result->type_flags,
resid, result->config);
}
// Convert the package ID to the runtime assigned package ID.
Res_value value = std::get<Res_value>(result->entry);
result->dynamic_ref_table->lookupResourceValue(&value);
return SelectedValue(value.dataType, value.data, result->cookie, result->type_flags,
resid, result->config);
}
base::expected<std::monostate, NullOrIOError> AssetManager2::ResolveReference(
AssetManager2::SelectedValue& value, bool cache_value) const {
if (value.type != Res_value::TYPE_REFERENCE || value.data == 0U) {
// Not a reference. Nothing to do.
return {};
}
const uint32_t original_flags = value.flags;
const uint32_t original_resid = value.data;
if (cache_value) {
auto cached_value = cached_resolved_values_.find(value.data);
if (cached_value != cached_resolved_values_.end()) {
value = cached_value->second;
value.flags |= original_flags;
return {};
}
}
uint32_t combined_flags = 0U;
uint32_t resolve_resid = original_resid;
constexpr const uint32_t kMaxIterations = 20;
for (uint32_t i = 0U;; i++) {
auto result = GetResource(resolve_resid, true /*may_be_bag*/);
if (!result.has_value()) {
value.resid = resolve_resid;
return base::unexpected(result.error());
}
// If resource resolution fails, the value should be set to the last reference that was able to
// be resolved successfully.
value = *result;
value.flags |= combined_flags;
if (result->type != Res_value::TYPE_REFERENCE ||
result->data == Res_value::DATA_NULL_UNDEFINED ||
result->data == resolve_resid || i == kMaxIterations) {
// This reference can't be resolved, so exit now and let the caller deal with it.
if (cache_value) {
cached_resolved_values_[original_resid] = value;
}
// Above value is cached without original_flags to ensure they don't get included in future
// queries that hit the cache
value.flags |= original_flags;
return {};
}
combined_flags = result->flags;
resolve_resid = result->data;
}
}
const std::vector<uint32_t> AssetManager2::GetBagResIdStack(uint32_t resid) const {
auto cached_iter = cached_bag_resid_stacks_.find(resid);
if (cached_iter != cached_bag_resid_stacks_.end()) {
return cached_iter->second;
}
std::vector<uint32_t> found_resids;
GetBag(resid, found_resids);
cached_bag_resid_stacks_.emplace(resid, found_resids);
return found_resids;
}
base::expected<const ResolvedBag*, NullOrIOError> AssetManager2::ResolveBag(
AssetManager2::SelectedValue& value) const {
if (UNLIKELY(value.type != Res_value::TYPE_REFERENCE)) {
return base::unexpected(std::nullopt);
}
auto bag = GetBag(value.data);
if (bag.has_value()) {
value.flags |= (*bag)->type_spec_flags;
}
return bag;
}
base::expected<const ResolvedBag*, NullOrIOError> AssetManager2::GetBag(uint32_t resid) const {
std::vector<uint32_t> found_resids;
const auto bag = GetBag(resid, found_resids);
cached_bag_resid_stacks_.emplace(resid, found_resids);
return bag;
}
base::expected<const ResolvedBag*, NullOrIOError> AssetManager2::GetBag(
uint32_t resid, std::vector<uint32_t>& child_resids) const {
if (auto cached_iter = cached_bags_.find(resid); cached_iter != cached_bags_.end()) {
return cached_iter->second.get();
}
auto entry = FindEntry(resid, 0u /* density_override */, false /* stop_at_first_match */,
false /* ignore_configuration */);
if (!entry.has_value()) {
return base::unexpected(entry.error());
}
auto entry_map = std::get_if<incfs::verified_map_ptr<ResTable_map_entry>>(&entry->entry);
if (entry_map == nullptr) {
// Not a bag, nothing to do.
return base::unexpected(std::nullopt);
}
auto map = *entry_map;
auto map_entry = map.offset(dtohs(map->size)).convert<ResTable_map>();
const auto map_entry_end = map_entry + dtohl(map->count);
// Keep track of ids that have already been seen to prevent infinite loops caused by circular
// dependencies between bags.
child_resids.push_back(resid);
uint32_t parent_resid = dtohl(map->parent.ident);
if (parent_resid == 0U ||
std::find(child_resids.begin(), child_resids.end(), parent_resid) != child_resids.end()) {
// There is no parent or a circular parental dependency exist, meaning there is nothing to
// inherit and we can do a simple copy of the entries in the map.
const size_t entry_count = map_entry_end - map_entry;
util::unique_cptr<ResolvedBag> new_bag{reinterpret_cast<ResolvedBag*>(
malloc(sizeof(ResolvedBag) + (entry_count * sizeof(ResolvedBag::Entry))))};
bool sort_entries = false;
for (auto new_entry = new_bag->entries; map_entry != map_entry_end; ++map_entry) {
if (UNLIKELY(!map_entry)) {
return base::unexpected(IOError::PAGES_MISSING);
}
uint32_t new_key = dtohl(map_entry->name.ident);
if (!is_internal_resid(new_key)) {
// Attributes, arrays, etc don't have a resource id as the name. They specify
// other data, which would be wrong to change via a lookup.
if (UNLIKELY(entry->dynamic_ref_table->lookupResourceId(&new_key) != NO_ERROR)) {
LOG(ERROR) << base::StringPrintf("Failed to resolve key 0x%08x in bag 0x%08x.", new_key,
resid);
return base::unexpected(std::nullopt);
}
}
new_entry->cookie = entry->cookie;
new_entry->key = new_key;
new_entry->key_pool = nullptr;
new_entry->type_pool = nullptr;
new_entry->style = resid;
new_entry->value.copyFrom_dtoh(map_entry->value);
status_t err = entry->dynamic_ref_table->lookupResourceValue(&new_entry->value);
if (UNLIKELY(err != NO_ERROR)) {
LOG(ERROR) << base::StringPrintf(
"Failed to resolve value t=0x%02x d=0x%08x for key 0x%08x.", new_entry->value.dataType,
new_entry->value.data, new_key);
return base::unexpected(std::nullopt);
}
sort_entries = sort_entries ||
(new_entry != new_bag->entries && (new_entry->key < (new_entry - 1U)->key));
++new_entry;
}
if (sort_entries) {
std::sort(new_bag->entries, new_bag->entries + entry_count,
[](auto&& lhs, auto&& rhs) { return lhs.key < rhs.key; });
}
new_bag->type_spec_flags = entry->type_flags;
new_bag->entry_count = static_cast<uint32_t>(entry_count);
ResolvedBag* result = new_bag.get();
cached_bags_[resid] = std::move(new_bag);
return result;
}
// In case the parent is a dynamic reference, resolve it.
entry->dynamic_ref_table->lookupResourceId(&parent_resid);
// Get the parent and do a merge of the keys.
const auto parent_bag = GetBag(parent_resid, child_resids);
if (UNLIKELY(!parent_bag.has_value())) {
// Failed to get the parent that should exist.
LOG(ERROR) << base::StringPrintf("Failed to find parent 0x%08x of bag 0x%08x.", parent_resid,
resid);
return base::unexpected(parent_bag.error());
}
// Create the max possible entries we can make. Once we construct the bag,
// we will realloc to fit to size.
const size_t max_count = (*parent_bag)->entry_count + dtohl(map->count);
util::unique_cptr<ResolvedBag> new_bag{reinterpret_cast<ResolvedBag*>(
malloc(sizeof(ResolvedBag) + (max_count * sizeof(ResolvedBag::Entry))))};
ResolvedBag::Entry* new_entry = new_bag->entries;
const ResolvedBag::Entry* parent_entry = (*parent_bag)->entries;
const ResolvedBag::Entry* const parent_entry_end = parent_entry + (*parent_bag)->entry_count;
// The keys are expected to be in sorted order. Merge the two bags.
bool sort_entries = false;
while (map_entry != map_entry_end && parent_entry != parent_entry_end) {
if (UNLIKELY(!map_entry)) {
return base::unexpected(IOError::PAGES_MISSING);
}
uint32_t child_key = dtohl(map_entry->name.ident);
if (!is_internal_resid(child_key)) {
if (UNLIKELY(entry->dynamic_ref_table->lookupResourceId(&child_key) != NO_ERROR)) {
LOG(ERROR) << base::StringPrintf("Failed to resolve key 0x%08x in bag 0x%08x.", child_key,
resid);
return base::unexpected(std::nullopt);
}
}
if (child_key <= parent_entry->key) {
// Use the child key if it comes before the parent
// or is equal to the parent (overrides).
new_entry->cookie = entry->cookie;
new_entry->key = child_key;
new_entry->key_pool = nullptr;
new_entry->type_pool = nullptr;
new_entry->value.copyFrom_dtoh(map_entry->value);
new_entry->style = resid;
status_t err = entry->dynamic_ref_table->lookupResourceValue(&new_entry->value);
if (UNLIKELY(err != NO_ERROR)) {
LOG(ERROR) << base::StringPrintf(
"Failed to resolve value t=0x%02x d=0x%08x for key 0x%08x.", new_entry->value.dataType,
new_entry->value.data, child_key);
return base::unexpected(std::nullopt);
}
++map_entry;
} else {
// Take the parent entry as-is.
memcpy(new_entry, parent_entry, sizeof(*new_entry));
}
sort_entries = sort_entries ||
(new_entry != new_bag->entries && (new_entry->key < (new_entry - 1U)->key));
if (child_key >= parent_entry->key) {
// Move to the next parent entry if we used it or it was overridden.
++parent_entry;
}
// Increment to the next entry to fill.
++new_entry;
}
// Finish the child entries if they exist.
while (map_entry != map_entry_end) {
if (UNLIKELY(!map_entry)) {
return base::unexpected(IOError::PAGES_MISSING);
}
uint32_t new_key = dtohl(map_entry->name.ident);
if (!is_internal_resid(new_key)) {
if (UNLIKELY(entry->dynamic_ref_table->lookupResourceId(&new_key) != NO_ERROR)) {
LOG(ERROR) << base::StringPrintf("Failed to resolve key 0x%08x in bag 0x%08x.", new_key,
resid);
return base::unexpected(std::nullopt);
}
}
new_entry->cookie = entry->cookie;
new_entry->key = new_key;
new_entry->key_pool = nullptr;
new_entry->type_pool = nullptr;
new_entry->value.copyFrom_dtoh(map_entry->value);
new_entry->style = resid;
status_t err = entry->dynamic_ref_table->lookupResourceValue(&new_entry->value);
if (UNLIKELY(err != NO_ERROR)) {
LOG(ERROR) << base::StringPrintf("Failed to resolve value t=0x%02x d=0x%08x for key 0x%08x.",
new_entry->value.dataType, new_entry->value.data, new_key);
return base::unexpected(std::nullopt);
}
sort_entries = sort_entries ||
(new_entry != new_bag->entries && (new_entry->key < (new_entry - 1U)->key));
++map_entry;
++new_entry;
}
// Finish the parent entries if they exist.
if (parent_entry != parent_entry_end) {
// Take the rest of the parent entries as-is.
const size_t num_entries_to_copy = parent_entry_end - parent_entry;
memcpy(new_entry, parent_entry, num_entries_to_copy * sizeof(*new_entry));
new_entry += num_entries_to_copy;
}
// Resize the resulting array to fit.
const size_t actual_count = new_entry - new_bag->entries;
if (actual_count != max_count) {
new_bag.reset(reinterpret_cast<ResolvedBag*>(realloc(
new_bag.release(), sizeof(ResolvedBag) + (actual_count * sizeof(ResolvedBag::Entry)))));
}
if (sort_entries) {
std::sort(new_bag->entries, new_bag->entries + actual_count,
[](auto&& lhs, auto&& rhs) { return lhs.key < rhs.key; });
}
// Combine flags from the parent and our own bag.
new_bag->type_spec_flags = entry->type_flags | (*parent_bag)->type_spec_flags;
new_bag->entry_count = static_cast<uint32_t>(actual_count);
ResolvedBag* result = new_bag.get();
cached_bags_[resid] = std::move(new_bag);
return result;
}
static bool Utf8ToUtf16(const StringPiece& str, std::u16string* out) {
ssize_t len =
utf8_to_utf16_length(reinterpret_cast<const uint8_t*>(str.data()), str.size(), false);
if (len < 0) {
return false;
}
out->resize(static_cast<size_t>(len));
utf8_to_utf16(reinterpret_cast<const uint8_t*>(str.data()), str.size(), &*out->begin(),
static_cast<size_t>(len + 1));
return true;
}
base::expected<uint32_t, NullOrIOError> AssetManager2::GetResourceId(
const std::string& resource_name, const std::string& fallback_type,
const std::string& fallback_package) const {
StringPiece package_name, type, entry;
if (!ExtractResourceName(resource_name, &package_name, &type, &entry)) {
return base::unexpected(std::nullopt);
}
if (entry.empty()) {
return base::unexpected(std::nullopt);
}
if (package_name.empty()) {
package_name = fallback_package;
}
if (type.empty()) {
type = fallback_type;
}
std::u16string type16;
if (!Utf8ToUtf16(type, &type16)) {
return base::unexpected(std::nullopt);
}
std::u16string entry16;
if (!Utf8ToUtf16(entry, &entry16)) {
return base::unexpected(std::nullopt);
}
const StringPiece16 kAttr16 = u"attr";
const static std::u16string kAttrPrivate16 = u"^attr-private";
for (const PackageGroup& package_group : package_groups_) {
for (const ConfiguredPackage& package_impl : package_group.packages_) {
const LoadedPackage* package = package_impl.loaded_package_;
if (package_name != package->GetPackageName()) {
// All packages in the same group are expected to have the same package name.
break;
}
base::expected<uint32_t, NullOrIOError> resid = package->FindEntryByName(type16, entry16);
if (UNLIKELY(IsIOError(resid))) {
return base::unexpected(resid.error());
}
if (!resid.has_value() && kAttr16 == type16) {
// Private attributes in libraries (such as the framework) are sometimes encoded
// under the type '^attr-private' in order to leave the ID space of public 'attr'
// free for future additions. Check '^attr-private' for the same name.
resid = package->FindEntryByName(kAttrPrivate16, entry16);
}
if (resid.has_value()) {
return fix_package_id(*resid, package_group.dynamic_ref_table->mAssignedPackageId);
}
}
}
return base::unexpected(std::nullopt);
}
void AssetManager2::RebuildFilterList() {
for (PackageGroup& group : package_groups_) {
for (ConfiguredPackage& impl : group.packages_) {
// Destroy it.
impl.filtered_configs_.~ByteBucketArray();
// Re-create it.
new (&impl.filtered_configs_) ByteBucketArray<FilteredConfigGroup>();
// Create the filters here.
impl.loaded_package_->ForEachTypeSpec([&](const TypeSpec& type_spec, uint8_t type_id) {
FilteredConfigGroup& group = impl.filtered_configs_.editItemAt(type_id - 1);
for (const auto& type_entry : type_spec.type_entries) {
if (type_entry.config.match(configuration_)) {
group.type_entries.push_back(&type_entry);
}
}
});
}
}
}
void AssetManager2::InvalidateCaches(uint32_t diff) {
cached_bag_resid_stacks_.clear();
if (diff == 0xffffffffu) {
// Everything must go.
cached_bags_.clear();
return;
}
// Be more conservative with what gets purged. Only if the bag has other possible
// variations with respect to what changed (diff) should we remove it.
for (auto iter = cached_bags_.cbegin(); iter != cached_bags_.cend();) {
if (diff & iter->second->type_spec_flags) {
iter = cached_bags_.erase(iter);
} else {
++iter;
}
}
cached_resolved_values_.clear();
}
uint8_t AssetManager2::GetAssignedPackageId(const LoadedPackage* package) const {
for (auto& package_group : package_groups_) {
for (auto& package2 : package_group.packages_) {
if (package2.loaded_package_ == package) {
return package_group.dynamic_ref_table->mAssignedPackageId;
}
}
}
return 0;
}
std::unique_ptr<Theme> AssetManager2::NewTheme() {
constexpr size_t kInitialReserveSize = 32;
auto theme = std::unique_ptr<Theme>(new Theme(this));
theme->entries_.reserve(kInitialReserveSize);
return theme;
}
Theme::Theme(AssetManager2* asset_manager) : asset_manager_(asset_manager) {
}
Theme::~Theme() = default;
struct Theme::Entry {
uint32_t attr_res_id;
ApkAssetsCookie cookie;
uint32_t type_spec_flags;
Res_value value;
};
namespace {
struct ThemeEntryKeyComparer {
bool operator() (const Theme::Entry& entry, uint32_t attr_res_id) const noexcept {
return entry.attr_res_id < attr_res_id;
}
};
} // namespace
base::expected<std::monostate, NullOrIOError> Theme::ApplyStyle(uint32_t resid, bool force) {
ATRACE_NAME("Theme::ApplyStyle");
auto bag = asset_manager_->GetBag(resid);
if (!bag.has_value()) {
return base::unexpected(bag.error());
}
// Merge the flags from this style.
type_spec_flags_ |= (*bag)->type_spec_flags;
for (auto it = begin(*bag); it != end(*bag); ++it) {
const uint32_t attr_res_id = it->key;
// If the resource ID passed in is not a style, the key can be some other identifier that is not
// a resource ID. We should fail fast instead of operating with strange resource IDs.
if (!is_valid_resid(attr_res_id)) {
return base::unexpected(std::nullopt);
}
// DATA_NULL_EMPTY (@empty) is a valid resource value and DATA_NULL_UNDEFINED represents
// an absence of a valid value.
bool is_undefined = it->value.dataType == Res_value::TYPE_NULL &&
it->value.data != Res_value::DATA_NULL_EMPTY;
if (!force && is_undefined) {
continue;
}
Theme::Entry new_entry{attr_res_id, it->cookie, (*bag)->type_spec_flags, it->value};
auto entry_it = std::lower_bound(entries_.begin(), entries_.end(), attr_res_id,
ThemeEntryKeyComparer{});
if (entry_it != entries_.end() && entry_it->attr_res_id == attr_res_id) {
if (is_undefined) {
// DATA_NULL_UNDEFINED clears the value of the attribute in the theme only when `force` is
/// true.
entries_.erase(entry_it);
} else if (force) {
*entry_it = new_entry;
}
} else {
entries_.insert(entry_it, new_entry);
}
}
return {};
}
void Theme::Rebase(AssetManager2* am, const uint32_t* style_ids, const uint8_t* force,
size_t style_count) {
ATRACE_NAME("Theme::Rebase");
// Reset the entries without changing the vector capacity to prevent reallocations during
// ApplyStyle.
entries_.clear();
asset_manager_ = am;
for (size_t i = 0; i < style_count; i++) {
ApplyStyle(style_ids[i], force[i]);
}
}
std::optional<AssetManager2::SelectedValue> Theme::GetAttribute(uint32_t resid) const {
constexpr const uint32_t kMaxIterations = 20;
uint32_t type_spec_flags = 0u;
for (uint32_t i = 0; i <= kMaxIterations; i++) {
auto entry_it = std::lower_bound(entries_.begin(), entries_.end(), resid,
ThemeEntryKeyComparer{});
if (entry_it == entries_.end() || entry_it->attr_res_id != resid) {
return std::nullopt;
}
type_spec_flags |= entry_it->type_spec_flags;
if (entry_it->value.dataType == Res_value::TYPE_ATTRIBUTE) {
resid = entry_it->value.data;
continue;
}
return AssetManager2::SelectedValue(entry_it->value.dataType, entry_it->value.data,
entry_it->cookie, type_spec_flags, 0U /* resid */,
{} /* config */);
}
return std::nullopt;
}
base::expected<std::monostate, NullOrIOError> Theme::ResolveAttributeReference(
AssetManager2::SelectedValue& value) const {
if (value.type != Res_value::TYPE_ATTRIBUTE) {
return asset_manager_->ResolveReference(value);
}
std::optional<AssetManager2::SelectedValue> result = GetAttribute(value.data);
if (!result.has_value()) {
return base::unexpected(std::nullopt);
}
auto resolve_result = asset_manager_->ResolveReference(*result, true /* cache_value */);
if (resolve_result.has_value()) {
result->flags |= value.flags;
value = *result;
}
return resolve_result;
}
void Theme::Clear() {
entries_.clear();
}
base::expected<std::monostate, IOError> Theme::SetTo(const Theme& source) {
if (this == &source) {
return {};
}
type_spec_flags_ = source.type_spec_flags_;
if (asset_manager_ == source.asset_manager_) {
entries_ = source.entries_;
} else {
std::map<ApkAssetsCookie, ApkAssetsCookie> src_to_dest_asset_cookies;
typedef std::map<int, int> SourceToDestinationRuntimePackageMap;
std::map<ApkAssetsCookie, SourceToDestinationRuntimePackageMap> src_asset_cookie_id_map;
// Determine which ApkAssets are loaded in both theme AssetManagers.
const auto src_assets = source.asset_manager_->GetApkAssets();
for (size_t i = 0; i < src_assets.size(); i++) {
const ApkAssets* src_asset = src_assets[i];
const auto dest_assets = asset_manager_->GetApkAssets();
for (size_t j = 0; j < dest_assets.size(); j++) {
const ApkAssets* dest_asset = dest_assets[j];
if (src_asset != dest_asset) {
// ResourcesManager caches and reuses ApkAssets when the same apk must be present in
// multiple AssetManagers. Two ApkAssets point to the same version of the same resources
// if they are the same instance.
continue;
}
// Map the package ids of the asset in the source AssetManager to the package ids of the
// asset in th destination AssetManager.
SourceToDestinationRuntimePackageMap package_map;
for (const auto& loaded_package : src_asset->GetLoadedArsc()->GetPackages()) {
const int src_package_id = source.asset_manager_->GetAssignedPackageId(
loaded_package.get());
const int dest_package_id = asset_manager_->GetAssignedPackageId(loaded_package.get());
package_map[src_package_id] = dest_package_id;
}
src_to_dest_asset_cookies.insert(std::make_pair(i, j));
src_asset_cookie_id_map.insert(std::make_pair(i, package_map));
break;
}
}
// Reset the data in the destination theme.
entries_.clear();
for (const auto& entry : source.entries_) {
bool is_reference = (entry.value.dataType == Res_value::TYPE_ATTRIBUTE
|| entry.value.dataType == Res_value::TYPE_REFERENCE
|| entry.value.dataType == Res_value::TYPE_DYNAMIC_ATTRIBUTE
|| entry.value.dataType == Res_value::TYPE_DYNAMIC_REFERENCE)
&& entry.value.data != 0x0;
// If the attribute value represents an attribute or reference, the package id of the
// value needs to be rewritten to the package id of the value in the destination.
uint32_t attribute_data = entry.value.data;
if (is_reference) {
// Determine the package id of the reference in the destination AssetManager.
auto value_package_map = src_asset_cookie_id_map.find(entry.cookie);
if (value_package_map == src_asset_cookie_id_map.end()) {
continue;
}
auto value_dest_package = value_package_map->second.find(
get_package_id(entry.value.data));
if (value_dest_package == value_package_map->second.end()) {
continue;
}
attribute_data = fix_package_id(entry.value.data, value_dest_package->second);
}
// Find the cookie of the value in the destination. If the source apk is not loaded in the
// destination, only copy resources that do not reference resources in the source.
ApkAssetsCookie data_dest_cookie;
auto value_dest_cookie = src_to_dest_asset_cookies.find(entry.cookie);
if (value_dest_cookie != src_to_dest_asset_cookies.end()) {
data_dest_cookie = value_dest_cookie->second;
} else {
if (is_reference || entry.value.dataType == Res_value::TYPE_STRING) {
continue;
} else {
data_dest_cookie = 0x0;
}
}
// The package id of the attribute needs to be rewritten to the package id of the
// attribute in the destination.
int attribute_dest_package_id = get_package_id(entry.attr_res_id);
if (attribute_dest_package_id != 0x01) {
// Find the cookie of the attribute resource id in the source AssetManager
base::expected<FindEntryResult, NullOrIOError> attribute_entry_result =
source.asset_manager_->FindEntry(entry.attr_res_id, 0 /* density_override */ ,
true /* stop_at_first_match */,
true /* ignore_configuration */);
if (UNLIKELY(IsIOError(attribute_entry_result))) {
return base::unexpected(GetIOError(attribute_entry_result.error()));
}
if (!attribute_entry_result.has_value()) {
continue;
}
// Determine the package id of the attribute in the destination AssetManager.
auto attribute_package_map = src_asset_cookie_id_map.find(
attribute_entry_result->cookie);
if (attribute_package_map == src_asset_cookie_id_map.end()) {
continue;
}
auto attribute_dest_package = attribute_package_map->second.find(
attribute_dest_package_id);
if (attribute_dest_package == attribute_package_map->second.end()) {
continue;
}
attribute_dest_package_id = attribute_dest_package->second;
}
auto dest_attr_id = make_resid(attribute_dest_package_id, get_type_id(entry.attr_res_id),
get_entry_id(entry.attr_res_id));
Theme::Entry new_entry{dest_attr_id, data_dest_cookie, entry.type_spec_flags,
Res_value{.dataType = entry.value.dataType,
.data = attribute_data}};
// Since the entries were cleared, the attribute resource id has yet been mapped to any value.
auto entry_it = std::lower_bound(entries_.begin(), entries_.end(), dest_attr_id,
ThemeEntryKeyComparer{});
entries_.insert(entry_it, new_entry);
}
}
return {};
}
void Theme::Dump() const {
LOG(INFO) << base::StringPrintf("Theme(this=%p, AssetManager2=%p)", this, asset_manager_);
for (auto& entry : entries_) {
LOG(INFO) << base::StringPrintf(" entry(0x%08x)=(0x%08x) type=(0x%02x), cookie(%d)",
entry.attr_res_id, entry.value.data, entry.value.dataType,
entry.cookie);
}
}
} // namespace android