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/*
* 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/ApkAssets.h"
#include <algorithm>
#include "android-base/logging.h"
#include "utils/FileMap.h"
#include "utils/Trace.h"
#include "ziparchive/zip_archive.h"
#include "androidfw/Asset.h"
#include "androidfw/Util.h"
namespace android {
std::unique_ptr<const ApkAssets> ApkAssets::Load(const std::string& path, bool system) {
return ApkAssets::LoadImpl(path, system, false /*load_as_shared_library*/);
}
std::unique_ptr<const ApkAssets> ApkAssets::LoadAsSharedLibrary(const std::string& path,
bool system) {
return ApkAssets::LoadImpl(path, system, true /*load_as_shared_library*/);
}
std::unique_ptr<const ApkAssets> ApkAssets::LoadImpl(const std::string& path, bool system,
bool load_as_shared_library) {
ATRACE_CALL();
::ZipArchiveHandle unmanaged_handle;
int32_t result = ::OpenArchive(path.c_str(), &unmanaged_handle);
if (result != 0) {
LOG(ERROR) << ::ErrorCodeString(result);
return {};
}
// Wrap the handle in a unique_ptr so it gets automatically closed.
std::unique_ptr<ApkAssets> loaded_apk(new ApkAssets());
loaded_apk->zip_handle_.reset(unmanaged_handle);
::ZipString entry_name("resources.arsc");
::ZipEntry entry;
result = ::FindEntry(loaded_apk->zip_handle_.get(), entry_name, &entry);
if (result != 0) {
LOG(ERROR) << ::ErrorCodeString(result);
return {};
}
if (entry.method == kCompressDeflated) {
LOG(WARNING) << "resources.arsc is compressed.";
}
loaded_apk->path_ = path;
loaded_apk->resources_asset_ =
loaded_apk->Open("resources.arsc", Asset::AccessMode::ACCESS_BUFFER);
if (loaded_apk->resources_asset_ == nullptr) {
return {};
}
loaded_apk->loaded_arsc_ =
LoadedArsc::Load(loaded_apk->resources_asset_->getBuffer(true /*wordAligned*/),
loaded_apk->resources_asset_->getLength(), system, load_as_shared_library);
if (loaded_apk->loaded_arsc_ == nullptr) {
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 {
ATRACE_CALL();
CHECK(zip_handle_ != nullptr);
::ZipString name(path.c_str());
::ZipEntry entry;
int32_t result = ::FindEntry(zip_handle_.get(), name, &entry);
if (result != 0) {
LOG(ERROR) << "No entry '" << path << "' found in APK '" << path_ << "'";
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());
auto iter = std::find(leaf_file_path.begin(), leaf_file_path.end(), '/');
if (iter != leaf_file_path.end()) {
dirs.insert(
leaf_file_path.substr(0, std::distance(leaf_file_path.begin(), iter)).to_string());
} else if (!leaf_file_path.empty()) {
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
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