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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.
*/
#include "androidfw/ApkAssets.h"
#include "android-base/errors.h"
#include "android-base/logging.h"
namespace android {
using base::SystemErrorCodeToString;
using base::unique_fd;
constexpr const char* kResourcesArsc = "resources.arsc";
ApkAssets::ApkAssets(std::unique_ptr<Asset> resources_asset,
std::unique_ptr<LoadedArsc> loaded_arsc,
std::unique_ptr<AssetsProvider> assets,
package_property_t property_flags,
std::unique_ptr<Asset> idmap_asset,
std::unique_ptr<LoadedIdmap> loaded_idmap)
: resources_asset_(std::move(resources_asset)),
loaded_arsc_(std::move(loaded_arsc)),
assets_provider_(std::move(assets)),
property_flags_(property_flags),
idmap_asset_(std::move(idmap_asset)),
loaded_idmap_(std::move(loaded_idmap)) {}
std::unique_ptr<ApkAssets> ApkAssets::Load(const std::string& path, package_property_t flags) {
return Load(ZipAssetsProvider::Create(path, flags), flags);
}
std::unique_ptr<ApkAssets> ApkAssets::LoadFromFd(base::unique_fd fd,
const std::string& debug_name,
package_property_t flags,
off64_t offset,
off64_t len) {
return Load(ZipAssetsProvider::Create(std::move(fd), debug_name, offset, len), flags);
}
std::unique_ptr<ApkAssets> ApkAssets::Load(std::unique_ptr<AssetsProvider> assets,
package_property_t flags) {
return LoadImpl(std::move(assets), flags, nullptr /* idmap_asset */, nullptr /* loaded_idmap */);
}
std::unique_ptr<ApkAssets> ApkAssets::LoadTable(std::unique_ptr<Asset> resources_asset,
std::unique_ptr<AssetsProvider> assets,
package_property_t flags) {
if (resources_asset == nullptr) {
return {};
}
return LoadImpl(std::move(resources_asset), std::move(assets), flags, nullptr /* idmap_asset */,
nullptr /* loaded_idmap */);
}
std::unique_ptr<ApkAssets> ApkAssets::LoadOverlay(const std::string& idmap_path,
package_property_t flags) {
CHECK((flags & PROPERTY_LOADER) == 0U) << "Cannot load RROs through loaders";
auto idmap_asset = AssetsProvider::CreateAssetFromFile(idmap_path);
if (idmap_asset == nullptr) {
LOG(ERROR) << "failed to read IDMAP " << idmap_path;
return {};
}
StringPiece idmap_data(reinterpret_cast<const char*>(idmap_asset->getBuffer(true /* aligned */)),
static_cast<size_t>(idmap_asset->getLength()));
auto loaded_idmap = LoadedIdmap::Load(idmap_path, idmap_data);
if (loaded_idmap == nullptr) {
LOG(ERROR) << "failed to load IDMAP " << idmap_path;
return {};
}
std::unique_ptr<AssetsProvider> overlay_assets;
const std::string overlay_path(loaded_idmap->OverlayApkPath());
if (IsFabricatedOverlay(overlay_path)) {
// Fabricated overlays do not contain resource definitions. All of the overlay resource values
// are defined inline in the idmap.
overlay_assets = EmptyAssetsProvider::Create(overlay_path);
} else {
// The overlay should be an APK.
overlay_assets = ZipAssetsProvider::Create(overlay_path, flags);
}
if (overlay_assets == nullptr) {
return {};
}
return LoadImpl(std::move(overlay_assets), flags | PROPERTY_OVERLAY, std::move(idmap_asset),
std::move(loaded_idmap));
}
std::unique_ptr<ApkAssets> ApkAssets::LoadImpl(std::unique_ptr<AssetsProvider> assets,
package_property_t property_flags,
std::unique_ptr<Asset> idmap_asset,
std::unique_ptr<LoadedIdmap> loaded_idmap) {
if (assets == nullptr) {
return {};
}
// Open the resource table via mmap unless it is compressed. This logic is taken care of by Open.
bool resources_asset_exists = false;
auto resources_asset = assets->Open(kResourcesArsc, Asset::AccessMode::ACCESS_BUFFER,
&resources_asset_exists);
if (resources_asset == nullptr && resources_asset_exists) {
LOG(ERROR) << "Failed to open '" << kResourcesArsc << "' in APK '" << assets->GetDebugName()
<< "'.";
return {};
}
return LoadImpl(std::move(resources_asset), std::move(assets), property_flags,
std::move(idmap_asset), std::move(loaded_idmap));
}
std::unique_ptr<ApkAssets> ApkAssets::LoadImpl(std::unique_ptr<Asset> resources_asset,
std::unique_ptr<AssetsProvider> assets,
package_property_t property_flags,
std::unique_ptr<Asset> idmap_asset,
std::unique_ptr<LoadedIdmap> loaded_idmap) {
if (assets == nullptr ) {
return {};
}
std::unique_ptr<LoadedArsc> loaded_arsc;
if (resources_asset != nullptr) {
const auto data = resources_asset->getIncFsBuffer(true /* aligned */);
const size_t length = resources_asset->getLength();
if (!data || length == 0) {
LOG(ERROR) << "Failed to read resources table in APK '" << assets->GetDebugName() << "'.";
return {};
}
loaded_arsc = LoadedArsc::Load(data, length, loaded_idmap.get(), property_flags);
} else {
loaded_arsc = LoadedArsc::CreateEmpty();
}
if (loaded_arsc == nullptr) {
LOG(ERROR) << "Failed to load resources table in APK '" << assets->GetDebugName() << "'.";
return {};
}
return std::unique_ptr<ApkAssets>(new ApkAssets(std::move(resources_asset),
std::move(loaded_arsc), std::move(assets),
property_flags, std::move(idmap_asset),
std::move(loaded_idmap)));
}
std::optional<std::string_view> ApkAssets::GetPath() const {
return assets_provider_->GetPath();
}
const std::string& ApkAssets::GetDebugName() const {
return assets_provider_->GetDebugName();
}
bool ApkAssets::IsUpToDate() const {
// Loaders are invalidated by the app, not the system, so assume they are up to date.
return IsLoader() || ((!loaded_idmap_ || loaded_idmap_->IsUpToDate())
&& assets_provider_->IsUpToDate());
}
} // namespace android
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