tools/aapt2/LoadedApk.cpp - LeafOS-Project/android_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 "LoadedApk.h"

 #include "ResourceValues.h"
 #include "ValueVisitor.h"
 #include "format/Archive.h"
 #include "format/binary/TableFlattener.h"
 #include "format/binary/XmlFlattener.h"
 #include "format/proto/ProtoDeserialize.h"
 #include "format/proto/ProtoSerialize.h"
 #include "io/BigBufferStream.h"
 #include "io/Util.h"
 #include "xml/XmlDom.h"

 using ::aapt::io::IFile;
 using ::aapt::io::IFileCollection;
 using ::aapt::xml::XmlResource;
 using ::android::StringPiece;
 using ::std::unique_ptr;

 namespace aapt {

 static ApkFormat DetermineApkFormat(io::IFileCollection* apk) {
   if (apk->FindFile(kApkResourceTablePath) != nullptr) {
     return ApkFormat::kBinary;
   } else if (apk->FindFile(kProtoResourceTablePath) != nullptr) {
     return ApkFormat::kProto;
   } else {
     // If the resource table is not present, attempt to read the manifest.
     io::IFile* manifest_file = apk->FindFile(kAndroidManifestPath);
     if (manifest_file == nullptr) {
       return ApkFormat::kUnknown;
     }

     // First try in proto format.
     std::unique_ptr<io::InputStream> manifest_in = manifest_file->OpenInputStream();
     if (manifest_in != nullptr) {
       pb::XmlNode pb_node;
       io::ProtoInputStreamReader proto_reader(manifest_in.get());
       if (proto_reader.ReadMessage(&pb_node)) {
         return ApkFormat::kProto;
       }
     }

     // If it didn't work, try in binary format.
     std::unique_ptr<io::IData> manifest_data = manifest_file->OpenAsData();
     if (manifest_data != nullptr) {
       std::string error;
       std::unique_ptr<xml::XmlResource> manifest =
           xml::Inflate(manifest_data->data(), manifest_data->size(), &error);
       if (manifest != nullptr) {
         return ApkFormat::kBinary;
       }
     }

     return ApkFormat::kUnknown;
   }
 }

 std::unique_ptr<LoadedApk> LoadedApk::LoadApkFromPath(const StringPiece& path, IDiagnostics* diag) {
   Source source(path);
   std::string error;
   std::unique_ptr<io::ZipFileCollection> apk = io::ZipFileCollection::Create(path, &error);
   if (apk == nullptr) {
     diag->Error(DiagMessage(path) << "failed opening zip: " << error);
     return {};
   }

   ApkFormat apkFormat = DetermineApkFormat(apk.get());
   switch (apkFormat) {
     case ApkFormat::kBinary:
       return LoadBinaryApkFromFileCollection(source, std::move(apk), diag);
     case ApkFormat::kProto:
       return LoadProtoApkFromFileCollection(source, std::move(apk), diag);
     default:
       diag->Error(DiagMessage(path) << "could not identify format of APK");
       return {};
   }
 }

 std::unique_ptr<LoadedApk> LoadedApk::LoadProtoApkFromFileCollection(
     const Source& source, unique_ptr<io::IFileCollection> collection, IDiagnostics* diag) {
   std::unique_ptr<ResourceTable> table;

   io::IFile* table_file = collection->FindFile(kProtoResourceTablePath);
   if (table_file != nullptr) {
     pb::ResourceTable pb_table;
     std::unique_ptr<io::InputStream> in = table_file->OpenInputStream();
     if (in == nullptr) {
       diag->Error(DiagMessage(source) << "failed to open " << kProtoResourceTablePath);
       return {};
     }

     io::ProtoInputStreamReader proto_reader(in.get());
     if (!proto_reader.ReadMessage(&pb_table)) {
       diag->Error(DiagMessage(source) << "failed to read " << kProtoResourceTablePath);
       return {};
     }

     std::string error;
     table = util::make_unique<ResourceTable>(ResourceTable::Validation::kDisabled);
     if (!DeserializeTableFromPb(pb_table, collection.get(), table.get(), &error)) {
       diag->Error(DiagMessage(source)
                   << "failed to deserialize " << kProtoResourceTablePath << ": " << error);
       return {};
     }
   }

   io::IFile* manifest_file = collection->FindFile(kAndroidManifestPath);
   if (manifest_file == nullptr) {
     diag->Error(DiagMessage(source) << "failed to find " << kAndroidManifestPath);
     return {};
   }

   std::unique_ptr<io::InputStream> manifest_in = manifest_file->OpenInputStream();
   if (manifest_in == nullptr) {
     diag->Error(DiagMessage(source) << "failed to open " << kAndroidManifestPath);
     return {};
   }

   pb::XmlNode pb_node;
   io::ProtoInputStreamReader proto_reader(manifest_in.get());
   if (!proto_reader.ReadMessage(&pb_node)) {
     diag->Error(DiagMessage(source) << "failed to read proto " << kAndroidManifestPath);
     return {};
   }

   std::string error;
   std::unique_ptr<xml::XmlResource> manifest = DeserializeXmlResourceFromPb(pb_node, &error);
   if (manifest == nullptr) {
     diag->Error(DiagMessage(source)
                 << "failed to deserialize proto " << kAndroidManifestPath << ": " << error);
     return {};
   }
   return util::make_unique<LoadedApk>(source, std::move(collection), std::move(table),
                                       std::move(manifest), ApkFormat::kProto);
 }

 std::unique_ptr<LoadedApk> LoadedApk::LoadBinaryApkFromFileCollection(
     const Source& source, unique_ptr<io::IFileCollection> collection, IDiagnostics* diag) {
   std::unique_ptr<ResourceTable> table;

   io::IFile* table_file = collection->FindFile(kApkResourceTablePath);
   if (table_file != nullptr) {
     table = util::make_unique<ResourceTable>(ResourceTable::Validation::kDisabled);
     std::unique_ptr<io::IData> data = table_file->OpenAsData();
     if (data == nullptr) {
       diag->Error(DiagMessage(source) << "failed to open " << kApkResourceTablePath);
       return {};
     }
     BinaryResourceParser parser(diag, table.get(), source, data->data(), data->size(),
                                 collection.get());
     if (!parser.Parse()) {
       return {};
     }
   }

   io::IFile* manifest_file = collection->FindFile(kAndroidManifestPath);
   if (manifest_file == nullptr) {
     diag->Error(DiagMessage(source) << "failed to find " << kAndroidManifestPath);
     return {};
   }

   std::unique_ptr<io::IData> manifest_data = manifest_file->OpenAsData();
   if (manifest_data == nullptr) {
     diag->Error(DiagMessage(source) << "failed to open " << kAndroidManifestPath);
     return {};
   }

   std::string error;
   std::unique_ptr<xml::XmlResource> manifest =
       xml::Inflate(manifest_data->data(), manifest_data->size(), &error);
   if (manifest == nullptr) {
     diag->Error(DiagMessage(source)
                 << "failed to parse binary " << kAndroidManifestPath << ": " << error);
     return {};
   }
   return util::make_unique<LoadedApk>(source, std::move(collection), std::move(table),
                                       std::move(manifest), ApkFormat::kBinary);
 }

 bool LoadedApk::WriteToArchive(IAaptContext* context, const TableFlattenerOptions& options,
                                IArchiveWriter* writer) {
   FilterChain empty;
   return WriteToArchive(context, table_.get(), options, &empty, writer);
 }

 bool LoadedApk::WriteToArchive(IAaptContext* context, ResourceTable* split_table,
                                const TableFlattenerOptions& options, FilterChain* filters,
                                IArchiveWriter* writer, XmlResource* manifest) {
   std::set<std::string> referenced_resources;
   // List the files being referenced in the resource table.
   for (auto& pkg : split_table->packages) {
     for (auto& type : pkg->types) {
       for (auto& entry : type->entries) {
         for (auto& config_value : entry->values) {
           FileReference* file_ref = ValueCast<FileReference>(config_value->value.get());
           if (file_ref) {
             referenced_resources.insert(*file_ref->path);
           }
         }
       }
     }
   }

   std::unique_ptr<io::IFileCollectionIterator> iterator = apk_->Iterator();
   while (iterator->HasNext()) {
     io::IFile* file = iterator->Next();
     std::string path = file->GetSource().path;

     std::string output_path = path;
     bool is_resource = path.find("res/") == 0;
     if (is_resource) {
       auto it = options.shortened_path_map.find(path);
       if (it != options.shortened_path_map.end()) {
         output_path = it->second;
       }
     }

     // Skip resources that are not referenced if requested.
     if (is_resource && referenced_resources.find(output_path) == referenced_resources.end()) {
       if (context->IsVerbose()) {
         context->GetDiagnostics()->Note(DiagMessage()
                                         << "Removing resource '" << path << "' from APK.");
       }
       continue;
     }

     if (!filters->Keep(path)) {
       if (context->IsVerbose()) {
         context->GetDiagnostics()->Note(DiagMessage() << "Filtered '" << path << "' from APK.");
       }
       continue;
     }

     // The resource table needs to be re-serialized since it might have changed.
     if (format_ == ApkFormat::kBinary && path == kApkResourceTablePath) {
       BigBuffer buffer(4096);
       // TODO(adamlesinski): How to determine if there were sparse entries (and if to encode
       // with sparse entries) b/35389232.
       TableFlattener flattener(options, &buffer);
       if (!flattener.Consume(context, split_table)) {
         return false;
       }

       io::BigBufferInputStream input_stream(&buffer);
       if (!io::CopyInputStreamToArchive(context,
                                         &input_stream,
                                         path,
                                         ArchiveEntry::kAlign,
                                         writer)) {
         return false;
       }
     } else if (format_ == ApkFormat::kProto && path == kProtoResourceTablePath) {
       SerializeTableOptions proto_serialize_options;
       proto_serialize_options.collapse_key_stringpool =
           options.collapse_key_stringpool;
       proto_serialize_options.name_collapse_exemptions =
           options.name_collapse_exemptions;
       pb::ResourceTable pb_table;
       SerializeTableToPb(*split_table, &pb_table, context->GetDiagnostics(),
                          proto_serialize_options);
       if (!io::CopyProtoToArchive(context,
                                   &pb_table,
                                   path,
                                   ArchiveEntry::kAlign, writer)) {
         return false;
       }
     } else if (manifest != nullptr && path == "AndroidManifest.xml") {
       BigBuffer buffer(8192);
       XmlFlattenerOptions xml_flattener_options;
       xml_flattener_options.use_utf16 = true;
       XmlFlattener xml_flattener(&buffer, xml_flattener_options);
       if (!xml_flattener.Consume(context, manifest)) {
         context->GetDiagnostics()->Error(DiagMessage(path) << "flattening failed");
         return false;
       }

       uint32_t compression_flags = file->WasCompressed() ? ArchiveEntry::kCompress : 0u;
       io::BigBufferInputStream manifest_buffer_in(&buffer);
       if (!io::CopyInputStreamToArchive(context, &manifest_buffer_in, path, compression_flags,
                                         writer)) {
         return false;
       }
     } else {
       if (!io::CopyFileToArchivePreserveCompression(
               context, file, output_path, writer)) {
         return false;
       }
     }
   }
   return true;
 }

 std::unique_ptr<xml::XmlResource> LoadedApk::LoadXml(const std::string& file_path,
                                                      IDiagnostics* diag) const {
   io::IFile* file = apk_->FindFile(file_path);
   if (file == nullptr) {
     diag->Error(DiagMessage() << "failed to find file");
     return nullptr;
   }

   std::unique_ptr<xml::XmlResource> doc;
   if (format_ == ApkFormat::kProto) {
     std::unique_ptr<io::InputStream> in = file->OpenInputStream();
     if (!in) {
       diag->Error(DiagMessage() << "failed to open file");
       return nullptr;
     }

     pb::XmlNode pb_node;
     io::ProtoInputStreamReader proto_reader(in.get());
     if (!proto_reader.ReadMessage(&pb_node)) {
       diag->Error(DiagMessage() << "failed to parse file as proto XML");
       return nullptr;
     }

     std::string err;
     doc = DeserializeXmlResourceFromPb(pb_node, &err);
     if (!doc) {
       diag->Error(DiagMessage() << "failed to deserialize proto XML: " << err);
       return nullptr;
     }
   } else if (format_ == ApkFormat::kBinary) {
     std::unique_ptr<io::IData> data = file->OpenAsData();
     if (!data) {
       diag->Error(DiagMessage() << "failed to open file");
       return nullptr;
     }

     std::string err;
     doc = xml::Inflate(data->data(), data->size(), &err);
     if (!doc) {
       diag->Error(DiagMessage() << "failed to parse file as binary XML: " << err);
       return nullptr;
     }
   }

   return doc;
 }

 }  // namespace aapt
	/*
	* 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 "LoadedApk.h"

	#include "ResourceValues.h"
	#include "ValueVisitor.h"
	#include "format/Archive.h"
	#include "format/binary/TableFlattener.h"
	#include "format/binary/XmlFlattener.h"
	#include "format/proto/ProtoDeserialize.h"
	#include "format/proto/ProtoSerialize.h"
	#include "io/BigBufferStream.h"
	#include "io/Util.h"
	#include "xml/XmlDom.h"

	using ::aapt::io::IFile;
	using ::aapt::io::IFileCollection;
	using ::aapt::xml::XmlResource;
	using ::android::StringPiece;
	using ::std::unique_ptr;

	namespace aapt {

	static ApkFormat DetermineApkFormat(io::IFileCollection* apk) {
	if (apk->FindFile(kApkResourceTablePath) != nullptr) {
	return ApkFormat::kBinary;
	} else if (apk->FindFile(kProtoResourceTablePath) != nullptr) {
	return ApkFormat::kProto;
	} else {
	// If the resource table is not present, attempt to read the manifest.
	io::IFile* manifest_file = apk->FindFile(kAndroidManifestPath);
	if (manifest_file == nullptr) {
	return ApkFormat::kUnknown;
	}

	// First try in proto format.
	std::unique_ptr<io::InputStream> manifest_in = manifest_file->OpenInputStream();
	if (manifest_in != nullptr) {
	pb::XmlNode pb_node;
	io::ProtoInputStreamReader proto_reader(manifest_in.get());
	if (proto_reader.ReadMessage(&pb_node)) {
	return ApkFormat::kProto;
	}
	}

	// If it didn't work, try in binary format.
	std::unique_ptr<io::IData> manifest_data = manifest_file->OpenAsData();
	if (manifest_data != nullptr) {
	std::string error;
	std::unique_ptr<xml::XmlResource> manifest =
	xml::Inflate(manifest_data->data(), manifest_data->size(), &error);
	if (manifest != nullptr) {
	return ApkFormat::kBinary;
	}
	}

	return ApkFormat::kUnknown;
	}
	}

	std::unique_ptr<LoadedApk> LoadedApk::LoadApkFromPath(const StringPiece& path, IDiagnostics* diag) {
	Source source(path);
	std::string error;
	std::unique_ptr<io::ZipFileCollection> apk = io::ZipFileCollection::Create(path, &error);
	if (apk == nullptr) {
	diag->Error(DiagMessage(path) << "failed opening zip: " << error);
	return {};
	}

	ApkFormat apkFormat = DetermineApkFormat(apk.get());
	switch (apkFormat) {
	case ApkFormat::kBinary:
	return LoadBinaryApkFromFileCollection(source, std::move(apk), diag);
	case ApkFormat::kProto:
	return LoadProtoApkFromFileCollection(source, std::move(apk), diag);
	default:
	diag->Error(DiagMessage(path) << "could not identify format of APK");
	return {};
	}
	}

	std::unique_ptr<LoadedApk> LoadedApk::LoadProtoApkFromFileCollection(
	const Source& source, unique_ptr<io::IFileCollection> collection, IDiagnostics* diag) {
	std::unique_ptr<ResourceTable> table;

	io::IFile* table_file = collection->FindFile(kProtoResourceTablePath);
	if (table_file != nullptr) {
	pb::ResourceTable pb_table;
	std::unique_ptr<io::InputStream> in = table_file->OpenInputStream();
	if (in == nullptr) {
	diag->Error(DiagMessage(source) << "failed to open " << kProtoResourceTablePath);
	return {};
	}

	io::ProtoInputStreamReader proto_reader(in.get());
	if (!proto_reader.ReadMessage(&pb_table)) {
	diag->Error(DiagMessage(source) << "failed to read " << kProtoResourceTablePath);
	return {};
	}

	std::string error;
	table = util::make_unique<ResourceTable>(ResourceTable::Validation::kDisabled);
	if (!DeserializeTableFromPb(pb_table, collection.get(), table.get(), &error)) {
	diag->Error(DiagMessage(source)
	<< "failed to deserialize " << kProtoResourceTablePath << ": " << error);
	return {};
	}
	}

	io::IFile* manifest_file = collection->FindFile(kAndroidManifestPath);
	if (manifest_file == nullptr) {
	diag->Error(DiagMessage(source) << "failed to find " << kAndroidManifestPath);
	return {};
	}

	std::unique_ptr<io::InputStream> manifest_in = manifest_file->OpenInputStream();
	if (manifest_in == nullptr) {
	diag->Error(DiagMessage(source) << "failed to open " << kAndroidManifestPath);
	return {};
	}

	pb::XmlNode pb_node;
	io::ProtoInputStreamReader proto_reader(manifest_in.get());
	if (!proto_reader.ReadMessage(&pb_node)) {
	diag->Error(DiagMessage(source) << "failed to read proto " << kAndroidManifestPath);
	return {};
	}

	std::string error;
	std::unique_ptr<xml::XmlResource> manifest = DeserializeXmlResourceFromPb(pb_node, &error);
	if (manifest == nullptr) {
	diag->Error(DiagMessage(source)
	<< "failed to deserialize proto " << kAndroidManifestPath << ": " << error);
	return {};
	}
	return util::make_unique<LoadedApk>(source, std::move(collection), std::move(table),
	std::move(manifest), ApkFormat::kProto);
	}

	std::unique_ptr<LoadedApk> LoadedApk::LoadBinaryApkFromFileCollection(
	const Source& source, unique_ptr<io::IFileCollection> collection, IDiagnostics* diag) {
	std::unique_ptr<ResourceTable> table;

	io::IFile* table_file = collection->FindFile(kApkResourceTablePath);
	if (table_file != nullptr) {
	table = util::make_unique<ResourceTable>(ResourceTable::Validation::kDisabled);
	std::unique_ptr<io::IData> data = table_file->OpenAsData();
	if (data == nullptr) {
	diag->Error(DiagMessage(source) << "failed to open " << kApkResourceTablePath);
	return {};
	}
	BinaryResourceParser parser(diag, table.get(), source, data->data(), data->size(),
	collection.get());
	if (!parser.Parse()) {
	return {};
	}
	}

	io::IFile* manifest_file = collection->FindFile(kAndroidManifestPath);
	if (manifest_file == nullptr) {
	diag->Error(DiagMessage(source) << "failed to find " << kAndroidManifestPath);
	return {};
	}

	std::unique_ptr<io::IData> manifest_data = manifest_file->OpenAsData();
	if (manifest_data == nullptr) {
	diag->Error(DiagMessage(source) << "failed to open " << kAndroidManifestPath);
	return {};
	}

	std::string error;
	std::unique_ptr<xml::XmlResource> manifest =
	xml::Inflate(manifest_data->data(), manifest_data->size(), &error);
	if (manifest == nullptr) {
	diag->Error(DiagMessage(source)
	<< "failed to parse binary " << kAndroidManifestPath << ": " << error);
	return {};
	}
	return util::make_unique<LoadedApk>(source, std::move(collection), std::move(table),
	std::move(manifest), ApkFormat::kBinary);
	}

	bool LoadedApk::WriteToArchive(IAaptContext* context, const TableFlattenerOptions& options,
	IArchiveWriter* writer) {
	FilterChain empty;
	return WriteToArchive(context, table_.get(), options, &empty, writer);
	}

	bool LoadedApk::WriteToArchive(IAaptContext* context, ResourceTable* split_table,
	const TableFlattenerOptions& options, FilterChain* filters,
	IArchiveWriter* writer, XmlResource* manifest) {
	std::set<std::string> referenced_resources;
	// List the files being referenced in the resource table.
	for (auto& pkg : split_table->packages) {
	for (auto& type : pkg->types) {
	for (auto& entry : type->entries) {
	for (auto& config_value : entry->values) {
	FileReference* file_ref = ValueCast<FileReference>(config_value->value.get());
	if (file_ref) {
	referenced_resources.insert(*file_ref->path);
	}
	}
	}
	}
	}

	std::unique_ptr<io::IFileCollectionIterator> iterator = apk_->Iterator();
	while (iterator->HasNext()) {
	io::IFile* file = iterator->Next();
	std::string path = file->GetSource().path;

	std::string output_path = path;
	bool is_resource = path.find("res/") == 0;
	if (is_resource) {
	auto it = options.shortened_path_map.find(path);
	if (it != options.shortened_path_map.end()) {
	output_path = it->second;
	}
	}

	// Skip resources that are not referenced if requested.
	if (is_resource && referenced_resources.find(output_path) == referenced_resources.end()) {
	if (context->IsVerbose()) {
	context->GetDiagnostics()->Note(DiagMessage()
	<< "Removing resource '" << path << "' from APK.");
	}
	continue;
	}

	if (!filters->Keep(path)) {
	if (context->IsVerbose()) {
	context->GetDiagnostics()->Note(DiagMessage() << "Filtered '" << path << "' from APK.");
	}
	continue;
	}

	// The resource table needs to be re-serialized since it might have changed.
	if (format_ == ApkFormat::kBinary && path == kApkResourceTablePath) {
	BigBuffer buffer(4096);
	// TODO(adamlesinski): How to determine if there were sparse entries (and if to encode
	// with sparse entries) b/35389232.
	TableFlattener flattener(options, &buffer);
	if (!flattener.Consume(context, split_table)) {
	return false;
	}

	io::BigBufferInputStream input_stream(&buffer);
	if (!io::CopyInputStreamToArchive(context,
	&input_stream,
	path,
	ArchiveEntry::kAlign,
	writer)) {
	return false;
	}
	} else if (format_ == ApkFormat::kProto && path == kProtoResourceTablePath) {
	SerializeTableOptions proto_serialize_options;
	proto_serialize_options.collapse_key_stringpool =
	options.collapse_key_stringpool;
	proto_serialize_options.name_collapse_exemptions =
	options.name_collapse_exemptions;
	pb::ResourceTable pb_table;
	SerializeTableToPb(*split_table, &pb_table, context->GetDiagnostics(),
	proto_serialize_options);
	if (!io::CopyProtoToArchive(context,
	&pb_table,
	path,
	ArchiveEntry::kAlign, writer)) {
	return false;
	}
	} else if (manifest != nullptr && path == "AndroidManifest.xml") {
	BigBuffer buffer(8192);
	XmlFlattenerOptions xml_flattener_options;
	xml_flattener_options.use_utf16 = true;
	XmlFlattener xml_flattener(&buffer, xml_flattener_options);
	if (!xml_flattener.Consume(context, manifest)) {
	context->GetDiagnostics()->Error(DiagMessage(path) << "flattening failed");
	return false;
	}

	uint32_t compression_flags = file->WasCompressed() ? ArchiveEntry::kCompress : 0u;
	io::BigBufferInputStream manifest_buffer_in(&buffer);
	if (!io::CopyInputStreamToArchive(context, &manifest_buffer_in, path, compression_flags,
	writer)) {
	return false;
	}
	} else {
	if (!io::CopyFileToArchivePreserveCompression(
	context, file, output_path, writer)) {
	return false;
	}
	}
	}
	return true;
	}

	std::unique_ptr<xml::XmlResource> LoadedApk::LoadXml(const std::string& file_path,
	IDiagnostics* diag) const {
	io::IFile* file = apk_->FindFile(file_path);
	if (file == nullptr) {
	diag->Error(DiagMessage() << "failed to find file");
	return nullptr;
	}

	std::unique_ptr<xml::XmlResource> doc;
	if (format_ == ApkFormat::kProto) {
	std::unique_ptr<io::InputStream> in = file->OpenInputStream();
	if (!in) {
	diag->Error(DiagMessage() << "failed to open file");
	return nullptr;
	}

	pb::XmlNode pb_node;
	io::ProtoInputStreamReader proto_reader(in.get());
	if (!proto_reader.ReadMessage(&pb_node)) {
	diag->Error(DiagMessage() << "failed to parse file as proto XML");
	return nullptr;
	}

	std::string err;
	doc = DeserializeXmlResourceFromPb(pb_node, &err);
	if (!doc) {
	diag->Error(DiagMessage() << "failed to deserialize proto XML: " << err);
	return nullptr;
	}
	} else if (format_ == ApkFormat::kBinary) {
	std::unique_ptr<io::IData> data = file->OpenAsData();
	if (!data) {
	diag->Error(DiagMessage() << "failed to open file");
	return nullptr;
	}

	std::string err;
	doc = xml::Inflate(data->data(), data->size(), &err);
	if (!doc) {
	diag->Error(DiagMessage() << "failed to parse file as binary XML: " << err);
	return nullptr;
	}
	}

	return doc;
	}

	} // namespace aapt