libs/androidfw/ApkAssets.cpp - platform/frameworks/base - Gitiles

 /*
  * 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/misc.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,
                      time_t last_mod_time,
                      package_property_t property_flags)
     : zip_handle_(unmanaged_handle, ::CloseArchive), path_(path), last_mod_time_(last_mod_time),
       property_flags_(property_flags) {
 }

 std::unique_ptr<const ApkAssets> ApkAssets::Load(const std::string& path, bool system,
                                                  bool for_loader) {
   package_property_t flags = (system ? PROPERTY_SYSTEM : 0U) |
                              (for_loader ? PROPERTY_LOADER : 0U);
   return LoadImpl({} /*fd*/, path, nullptr, nullptr, flags);
 }

 std::unique_ptr<const ApkAssets> ApkAssets::LoadAsSharedLibrary(const std::string& path,
                                                                 bool system) {
   package_property_t flags = PROPERTY_DYNAMIC | (system ? PROPERTY_SYSTEM : 0U);
   return LoadImpl({} /*fd*/, path, nullptr, nullptr, flags);
 }

 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),
                   PROPERTY_OVERLAY | (system ? PROPERTY_SYSTEM : 0U));
 }

 std::unique_ptr<const ApkAssets> ApkAssets::LoadFromFd(unique_fd fd,
                                                        const std::string& friendly_name,
                                                        bool system, bool force_shared_lib,
                                                        bool for_loader) {
   package_property_t flags = (system ? PROPERTY_SYSTEM : 0U) |
                              (force_shared_lib ? PROPERTY_DYNAMIC : 0U) |
                              (for_loader ? PROPERTY_LOADER : 0U);
   return LoadImpl(std::move(fd), friendly_name, nullptr /*idmap_asset*/, nullptr /*loaded_idmap*/,
                   flags);
 }

 std::unique_ptr<const ApkAssets> ApkAssets::LoadArsc(const std::string& path,
                                                      bool for_loader) {
   return LoadArscImpl({} /*fd*/, path, for_loader ? PROPERTY_LOADER : 0U);
 }

 std::unique_ptr<const ApkAssets> ApkAssets::LoadArsc(unique_fd fd,
                                                      const std::string& friendly_name,
                                                      bool for_loader) {
   return LoadArscImpl(std::move(fd), friendly_name, for_loader ? PROPERTY_LOADER : 0U);
 }

 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, package_property_t property_flags) {
   ::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);
     ::CloseArchive(unmanaged_handle);
     return {};
   }

   time_t last_mod_time = getFileModDate(path.c_str());

   // Wrap the handle in a unique_ptr so it gets automatically closed.
   std::unique_ptr<ApkAssets>
       loaded_apk(new ApkAssets(unmanaged_handle, path, last_mod_time, property_flags));

   // 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) {
     ANDROID_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);
   loaded_apk->loaded_idmap_ = std::move(loaded_idmap);

   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_apk->loaded_idmap_.get(),
                                               property_flags);
   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<const ApkAssets> ApkAssets::LoadArscImpl(unique_fd fd,
                                                          const std::string& path,
                                                          package_property_t property_flags) {
   std::unique_ptr<Asset> resources_asset;

   if (fd >= 0) {
     resources_asset = std::unique_ptr<Asset>(Asset::createFromFd(fd.release(), nullptr,
         Asset::AccessMode::ACCESS_BUFFER));
   } else {
     resources_asset = CreateAssetFromFile(path);
   }

   if (resources_asset == nullptr) {
     LOG(ERROR) << "Failed to open ARSC '" << path;
     return {};
   }

   time_t last_mod_time = getFileModDate(path.c_str());

   std::unique_ptr<ApkAssets> loaded_apk(
       new ApkAssets(nullptr, path, last_mod_time, property_flags));
   loaded_apk->resources_asset_ = std::move(resources_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, nullptr, property_flags);
   if (loaded_apk->loaded_arsc_ == nullptr) {
     LOG(ERROR) << "Failed to load '" << kResourcesArsc << path;
     return {};
   }

   // Need to force a move for mingw32.
   return std::move(loaded_apk);
 }

 std::unique_ptr<const ApkAssets> ApkAssets::LoadEmpty(bool for_loader) {
   std::unique_ptr<ApkAssets> loaded_apk(new ApkAssets(nullptr, "", -1, for_loader));
   loaded_apk->loaded_arsc_ = LoadedArsc::CreateEmpty();
   // 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 {
   // If this is a resource loader from an .arsc, there will be no zip handle
   if (zip_handle_ == nullptr) {
     return {};
   }

   ::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 {
   // If this is a resource loader from an .arsc, there will be no zip handle
   if (zip_handle_ == nullptr) {
     return false;
   }

   std::string root_path_full = root_path;
   if (root_path_full.back() != '/') {
     root_path_full += '/';
   }

   void* cookie;
   if (::StartIteration(zip_handle_.get(), &cookie, root_path_full, "") != 0) {
     return false;
   }

   std::string 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(name);
     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;
 }

 bool ApkAssets::IsUpToDate() const {
   if (IsLoader()) {
     // Loaders are invalidated by the app, not the system, so assume up to date.
     return true;
   }

   return last_mod_time_ == getFileModDate(path_.c_str());
 }

 }  // namespace android
	/*
	* 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/misc.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,
	time_t last_mod_time,
	package_property_t property_flags)
	: zip_handle_(unmanaged_handle, ::CloseArchive), path_(path), last_mod_time_(last_mod_time),
	property_flags_(property_flags) {
	}

	std::unique_ptr<const ApkAssets> ApkAssets::Load(const std::string& path, bool system,
	bool for_loader) {
	package_property_t flags = (system ? PROPERTY_SYSTEM : 0U) \|
	(for_loader ? PROPERTY_LOADER : 0U);
	return LoadImpl({} /fd/, path, nullptr, nullptr, flags);
	}

	std::unique_ptr<const ApkAssets> ApkAssets::LoadAsSharedLibrary(const std::string& path,
	bool system) {
	package_property_t flags = PROPERTY_DYNAMIC \| (system ? PROPERTY_SYSTEM : 0U);
	return LoadImpl({} /fd/, path, nullptr, nullptr, flags);
	}

	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),
	PROPERTY_OVERLAY \| (system ? PROPERTY_SYSTEM : 0U));
	}

	std::unique_ptr<const ApkAssets> ApkAssets::LoadFromFd(unique_fd fd,
	const std::string& friendly_name,
	bool system, bool force_shared_lib,
	bool for_loader) {
	package_property_t flags = (system ? PROPERTY_SYSTEM : 0U) \|
	(force_shared_lib ? PROPERTY_DYNAMIC : 0U) \|
	(for_loader ? PROPERTY_LOADER : 0U);
	return LoadImpl(std::move(fd), friendly_name, nullptr /idmap_asset/, nullptr /loaded_idmap/,
	flags);
	}

	std::unique_ptr<const ApkAssets> ApkAssets::LoadArsc(const std::string& path,
	bool for_loader) {
	return LoadArscImpl({} /fd/, path, for_loader ? PROPERTY_LOADER : 0U);
	}

	std::unique_ptr<const ApkAssets> ApkAssets::LoadArsc(unique_fd fd,
	const std::string& friendly_name,
	bool for_loader) {
	return LoadArscImpl(std::move(fd), friendly_name, for_loader ? PROPERTY_LOADER : 0U);
	}

	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, package_property_t property_flags) {
	::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);
	::CloseArchive(unmanaged_handle);
	return {};
	}

	time_t last_mod_time = getFileModDate(path.c_str());

	// Wrap the handle in a unique_ptr so it gets automatically closed.
	std::unique_ptr<ApkAssets>
	loaded_apk(new ApkAssets(unmanaged_handle, path, last_mod_time, property_flags));

	// 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) {
	ANDROID_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);
	loaded_apk->loaded_idmap_ = std::move(loaded_idmap);

	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_apk->loaded_idmap_.get(),
	property_flags);
	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<const ApkAssets> ApkAssets::LoadArscImpl(unique_fd fd,
	const std::string& path,
	package_property_t property_flags) {
	std::unique_ptr<Asset> resources_asset;

	if (fd >= 0) {
	resources_asset = std::unique_ptr<Asset>(Asset::createFromFd(fd.release(), nullptr,
	Asset::AccessMode::ACCESS_BUFFER));
	} else {
	resources_asset = CreateAssetFromFile(path);
	}

	if (resources_asset == nullptr) {
	LOG(ERROR) << "Failed to open ARSC '" << path;
	return {};
	}

	time_t last_mod_time = getFileModDate(path.c_str());

	std::unique_ptr<ApkAssets> loaded_apk(
	new ApkAssets(nullptr, path, last_mod_time, property_flags));
	loaded_apk->resources_asset_ = std::move(resources_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, nullptr, property_flags);
	if (loaded_apk->loaded_arsc_ == nullptr) {
	LOG(ERROR) << "Failed to load '" << kResourcesArsc << path;
	return {};
	}

	// Need to force a move for mingw32.
	return std::move(loaded_apk);
	}

	std::unique_ptr<const ApkAssets> ApkAssets::LoadEmpty(bool for_loader) {
	std::unique_ptr<ApkAssets> loaded_apk(new ApkAssets(nullptr, "", -1, for_loader));
	loaded_apk->loaded_arsc_ = LoadedArsc::CreateEmpty();
	// 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 {
	// If this is a resource loader from an .arsc, there will be no zip handle
	if (zip_handle_ == nullptr) {
	return {};
	}

	::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 {
	// If this is a resource loader from an .arsc, there will be no zip handle
	if (zip_handle_ == nullptr) {
	return false;
	}

	std::string root_path_full = root_path;
	if (root_path_full.back() != '/') {
	root_path_full += '/';
	}

	void* cookie;
	if (::StartIteration(zip_handle_.get(), &cookie, root_path_full, "") != 0) {
	return false;
	}

	std::string 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(name);
	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;
	}

	bool ApkAssets::IsUpToDate() const {
	if (IsLoader()) {
	// Loaders are invalidated by the app, not the system, so assume up to date.
	return true;
	}

	return last_mod_time_ == getFileModDate(path_.c_str());
	}

	} // namespace android