blob: 47b7d646d79fe8a2d16cadeacf96248a78418499 [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.
*/
#include "androidfw/ApkAssets.h"
#include <algorithm>
#include "android-base/errors.h"
#include "android-base/file.h"
#include "android-base/logging.h"
#include "android-base/unique_fd.h"
#include "android-base/utf8.h"
#include "utils/Compat.h"
#include "utils/FileMap.h"
#include "ziparchive/zip_archive.h"
#include "androidfw/Asset.h"
#include "androidfw/Idmap.h"
#include "androidfw/ResourceTypes.h"
#include "androidfw/Util.h"
namespace android {
using base::SystemErrorCodeToString;
using base::unique_fd;
static const std::string kResourcesArsc("resources.arsc");
ApkAssets::ApkAssets(ZipArchiveHandle unmanaged_handle, const std::string& path)
: zip_handle_(unmanaged_handle, ::CloseArchive), path_(path) {
}
std::unique_ptr<const ApkAssets> ApkAssets::Load(const std::string& path, bool system) {
return LoadImpl({} /*fd*/, path, nullptr, nullptr, system, false /*load_as_shared_library*/);
}
std::unique_ptr<const ApkAssets> ApkAssets::LoadAsSharedLibrary(const std::string& path,
bool system) {
return LoadImpl({} /*fd*/, path, nullptr, nullptr, system, true /*load_as_shared_library*/);
}
std::unique_ptr<const ApkAssets> ApkAssets::LoadOverlay(const std::string& idmap_path,
bool system) {
std::unique_ptr<Asset> idmap_asset = CreateAssetFromFile(idmap_path);
if (idmap_asset == nullptr) {
return {};
}
const StringPiece idmap_data(
reinterpret_cast<const char*>(idmap_asset->getBuffer(true /*wordAligned*/)),
static_cast<size_t>(idmap_asset->getLength()));
std::unique_ptr<const LoadedIdmap> loaded_idmap = LoadedIdmap::Load(idmap_data);
if (loaded_idmap == nullptr) {
LOG(ERROR) << "failed to load IDMAP " << idmap_path;
return {};
}
return LoadImpl({} /*fd*/, loaded_idmap->OverlayApkPath(), std::move(idmap_asset),
std::move(loaded_idmap), system, false /*load_as_shared_library*/);
}
std::unique_ptr<const ApkAssets> ApkAssets::LoadFromFd(unique_fd fd,
const std::string& friendly_name,
bool system, bool force_shared_lib) {
return LoadImpl(std::move(fd), friendly_name, nullptr /*idmap_asset*/, nullptr /*loaded_idmap*/,
system, force_shared_lib);
}
std::unique_ptr<Asset> ApkAssets::CreateAssetFromFile(const std::string& path) {
unique_fd fd(base::utf8::open(path.c_str(), O_RDONLY | O_BINARY | O_CLOEXEC));
if (fd == -1) {
LOG(ERROR) << "Failed to open file '" << path << "': " << SystemErrorCodeToString(errno);
return {};
}
const off64_t file_len = lseek64(fd, 0, SEEK_END);
if (file_len < 0) {
LOG(ERROR) << "Failed to get size of file '" << path << "': " << SystemErrorCodeToString(errno);
return {};
}
std::unique_ptr<FileMap> file_map = util::make_unique<FileMap>();
if (!file_map->create(path.c_str(), fd, 0, static_cast<size_t>(file_len), true /*readOnly*/)) {
LOG(ERROR) << "Failed to mmap file '" << path << "': " << SystemErrorCodeToString(errno);
return {};
}
return Asset::createFromUncompressedMap(std::move(file_map), Asset::AccessMode::ACCESS_RANDOM);
}
std::unique_ptr<const ApkAssets> ApkAssets::LoadImpl(
unique_fd fd, const std::string& path, std::unique_ptr<Asset> idmap_asset,
std::unique_ptr<const LoadedIdmap> loaded_idmap, bool system, bool load_as_shared_library) {
::ZipArchiveHandle unmanaged_handle;
int32_t result;
if (fd >= 0) {
result =
::OpenArchiveFd(fd.release(), path.c_str(), &unmanaged_handle, true /*assume_ownership*/);
} else {
result = ::OpenArchive(path.c_str(), &unmanaged_handle);
}
if (result != 0) {
LOG(ERROR) << "Failed to open APK '" << path << "' " << ::ErrorCodeString(result);
return {};
}
// Wrap the handle in a unique_ptr so it gets automatically closed.
std::unique_ptr<ApkAssets> loaded_apk(new ApkAssets(unmanaged_handle, path));
// Find the resource table.
::ZipEntry entry;
result = ::FindEntry(loaded_apk->zip_handle_.get(), kResourcesArsc, &entry);
if (result != 0) {
// There is no resources.arsc, so create an empty LoadedArsc and return.
loaded_apk->loaded_arsc_ = LoadedArsc::CreateEmpty();
return std::move(loaded_apk);
}
if (entry.method == kCompressDeflated) {
LOG(WARNING) << kResourcesArsc << " in APK '" << path << "' is compressed.";
}
// Open the resource table via mmap unless it is compressed. This logic is taken care of by Open.
loaded_apk->resources_asset_ = loaded_apk->Open(kResourcesArsc, Asset::AccessMode::ACCESS_BUFFER);
if (loaded_apk->resources_asset_ == nullptr) {
LOG(ERROR) << "Failed to open '" << kResourcesArsc << "' in APK '" << path << "'.";
return {};
}
// Must retain ownership of the IDMAP Asset so that all pointers to its mmapped data remain valid.
loaded_apk->idmap_asset_ = std::move(idmap_asset);
const StringPiece data(
reinterpret_cast<const char*>(loaded_apk->resources_asset_->getBuffer(true /*wordAligned*/)),
loaded_apk->resources_asset_->getLength());
loaded_apk->loaded_arsc_ =
LoadedArsc::Load(data, loaded_idmap.get(), system, load_as_shared_library);
if (loaded_apk->loaded_arsc_ == nullptr) {
LOG(ERROR) << "Failed to load '" << kResourcesArsc << "' in APK '" << path << "'.";
return {};
}
// Need to force a move for mingw32.
return std::move(loaded_apk);
}
std::unique_ptr<Asset> ApkAssets::Open(const std::string& path, Asset::AccessMode mode) const {
CHECK(zip_handle_ != nullptr);
::ZipEntry entry;
int32_t result = ::FindEntry(zip_handle_.get(), path, &entry);
if (result != 0) {
return {};
}
if (entry.method == kCompressDeflated) {
std::unique_ptr<FileMap> map = util::make_unique<FileMap>();
if (!map->create(path_.c_str(), ::GetFileDescriptor(zip_handle_.get()), entry.offset,
entry.compressed_length, true /*readOnly*/)) {
LOG(ERROR) << "Failed to mmap file '" << path << "' in APK '" << path_ << "'";
return {};
}
std::unique_ptr<Asset> asset =
Asset::createFromCompressedMap(std::move(map), entry.uncompressed_length, mode);
if (asset == nullptr) {
LOG(ERROR) << "Failed to decompress '" << path << "'.";
return {};
}
return asset;
} else {
std::unique_ptr<FileMap> map = util::make_unique<FileMap>();
if (!map->create(path_.c_str(), ::GetFileDescriptor(zip_handle_.get()), entry.offset,
entry.uncompressed_length, true /*readOnly*/)) {
LOG(ERROR) << "Failed to mmap file '" << path << "' in APK '" << path_ << "'";
return {};
}
std::unique_ptr<Asset> asset = Asset::createFromUncompressedMap(std::move(map), mode);
if (asset == nullptr) {
LOG(ERROR) << "Failed to mmap file '" << path << "' in APK '" << path_ << "'";
return {};
}
return asset;
}
}
bool ApkAssets::ForEachFile(const std::string& root_path,
const std::function<void(const StringPiece&, FileType)>& f) const {
CHECK(zip_handle_ != nullptr);
std::string root_path_full = root_path;
if (root_path_full.back() != '/') {
root_path_full += '/';
}
::ZipString prefix(root_path_full.c_str());
void* cookie;
if (::StartIteration(zip_handle_.get(), &cookie, &prefix, nullptr) != 0) {
return false;
}
::ZipString name;
::ZipEntry entry;
// We need to hold back directories because many paths will contain them and we want to only
// surface one.
std::set<std::string> dirs;
int32_t result;
while ((result = ::Next(cookie, &entry, &name)) == 0) {
StringPiece full_file_path(reinterpret_cast<const char*>(name.name), name.name_length);
StringPiece leaf_file_path = full_file_path.substr(root_path_full.size());
if (!leaf_file_path.empty()) {
auto iter = std::find(leaf_file_path.begin(), leaf_file_path.end(), '/');
if (iter != leaf_file_path.end()) {
std::string dir =
leaf_file_path.substr(0, std::distance(leaf_file_path.begin(), iter)).to_string();
dirs.insert(std::move(dir));
} else {
f(leaf_file_path, kFileTypeRegular);
}
}
}
::EndIteration(cookie);
// Now present the unique directories.
for (const std::string& dir : dirs) {
f(dir, kFileTypeDirectory);
}
// -1 is end of iteration, anything else is an error.
return result == -1;
}
} // namespace android