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307 lines
10 KiB
307 lines
10 KiB
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "idmap2/FabricatedOverlay.h"
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#include <androidfw/ResourceUtils.h>
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#include <google/protobuf/io/coded_stream.h>
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#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
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#include <utils/ByteOrder.h>
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#include <zlib.h>
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#include <fstream>
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#include <map>
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#include <memory>
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#include <string>
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#include <utility>
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namespace android::idmap2 {
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namespace {
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bool Read32(std::istream& stream, uint32_t* out) {
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uint32_t value;
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if (stream.read(reinterpret_cast<char*>(&value), sizeof(uint32_t))) {
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*out = dtohl(value);
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return true;
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}
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return false;
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}
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void Write32(std::ostream& stream, uint32_t value) {
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uint32_t x = htodl(value);
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stream.write(reinterpret_cast<char*>(&x), sizeof(uint32_t));
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}
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} // namespace
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FabricatedOverlay::FabricatedOverlay(pb::FabricatedOverlay&& overlay,
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std::optional<uint32_t> crc_from_disk)
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: overlay_pb_(std::forward<pb::FabricatedOverlay>(overlay)), crc_from_disk_(crc_from_disk) {
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}
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FabricatedOverlay::Builder::Builder(const std::string& package_name, const std::string& name,
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const std::string& target_package_name) {
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package_name_ = package_name;
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name_ = name;
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target_package_name_ = target_package_name;
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}
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FabricatedOverlay::Builder& FabricatedOverlay::Builder::SetOverlayable(const std::string& name) {
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target_overlayable_ = name;
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return *this;
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}
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FabricatedOverlay::Builder& FabricatedOverlay::Builder::SetResourceValue(
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const std::string& resource_name, uint8_t data_type, uint32_t data_value) {
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entries_.emplace_back(Entry{resource_name, data_type, data_value});
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return *this;
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}
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Result<FabricatedOverlay> FabricatedOverlay::Builder::Build() {
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std::map<std::string, std::map<std::string, std::map<std::string, TargetValue>>> entries;
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for (const auto& res_entry : entries_) {
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StringPiece package_substr;
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StringPiece type_name;
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StringPiece entry_name;
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if (!android::ExtractResourceName(StringPiece(res_entry.resource_name), &package_substr,
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&type_name, &entry_name)) {
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return Error("failed to parse resource name '%s'", res_entry.resource_name.c_str());
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}
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std::string package_name =
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package_substr.empty() ? target_package_name_ : package_substr.to_string();
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if (type_name.empty()) {
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return Error("resource name '%s' missing type name", res_entry.resource_name.c_str());
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}
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if (entry_name.empty()) {
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return Error("resource name '%s' missing entry name", res_entry.resource_name.c_str());
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}
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auto package = entries.find(package_name);
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if (package == entries.end()) {
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package = entries
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.insert(std::make_pair(
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package_name, std::map<std::string, std::map<std::string, TargetValue>>()))
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.first;
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}
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auto type = package->second.find(type_name.to_string());
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if (type == package->second.end()) {
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type =
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package->second
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.insert(std::make_pair(type_name.to_string(), std::map<std::string, TargetValue>()))
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.first;
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}
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auto entry = type->second.find(entry_name.to_string());
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if (entry == type->second.end()) {
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entry = type->second.insert(std::make_pair(entry_name.to_string(), TargetValue())).first;
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}
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entry->second = TargetValue{res_entry.data_type, res_entry.data_value};
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}
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pb::FabricatedOverlay overlay_pb;
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overlay_pb.set_package_name(package_name_);
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overlay_pb.set_name(name_);
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overlay_pb.set_target_package_name(target_package_name_);
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overlay_pb.set_target_overlayable(target_overlayable_);
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for (const auto& package : entries) {
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auto package_pb = overlay_pb.add_packages();
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package_pb->set_name(package.first);
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for (const auto& type : package.second) {
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auto type_pb = package_pb->add_types();
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type_pb->set_name(type.first);
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for (const auto& entry : type.second) {
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auto entry_pb = type_pb->add_entries();
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entry_pb->set_name(entry.first);
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pb::ResourceValue* value = entry_pb->mutable_res_value();
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value->set_data_type(entry.second.data_type);
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value->set_data_value(entry.second.data_value);
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}
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}
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}
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return FabricatedOverlay(std::move(overlay_pb));
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}
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Result<FabricatedOverlay> FabricatedOverlay::FromBinaryStream(std::istream& stream) {
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uint32_t magic;
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if (!Read32(stream, &magic)) {
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return Error("Failed to read fabricated overlay magic.");
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}
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if (magic != kFabricatedOverlayMagic) {
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return Error("Not a fabricated overlay file.");
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}
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uint32_t version;
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if (!Read32(stream, &version)) {
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return Error("Failed to read fabricated overlay version.");
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}
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if (version != 1) {
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return Error("Invalid fabricated overlay version '%u'.", version);
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}
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uint32_t crc;
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if (!Read32(stream, &crc)) {
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return Error("Failed to read fabricated overlay version.");
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}
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pb::FabricatedOverlay overlay{};
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if (!overlay.ParseFromIstream(&stream)) {
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return Error("Failed read fabricated overlay proto.");
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}
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// If the proto version is the latest version, then the contents of the proto must be the same
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// when the proto is re-serialized; otherwise, the crc must be calculated because migrating the
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// proto to the latest version will likely change the contents of the fabricated overlay.
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return FabricatedOverlay(std::move(overlay), version == kFabricatedOverlayCurrentVersion
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? std::optional<uint32_t>(crc)
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: std::nullopt);
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}
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Result<FabricatedOverlay::SerializedData*> FabricatedOverlay::InitializeData() const {
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if (!data_.has_value()) {
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auto size = overlay_pb_.ByteSizeLong();
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auto data = std::unique_ptr<uint8_t[]>(new uint8_t[size]);
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// Ensure serialization is deterministic
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google::protobuf::io::ArrayOutputStream array_stream(data.get(), size);
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google::protobuf::io::CodedOutputStream output_stream(&array_stream);
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output_stream.SetSerializationDeterministic(true);
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overlay_pb_.SerializeWithCachedSizes(&output_stream);
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if (output_stream.HadError() || size != output_stream.ByteCount()) {
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return Error("Failed to serialize fabricated overlay.");
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}
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// Calculate the crc using the proto data and the version.
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uint32_t crc = crc32(0L, Z_NULL, 0);
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crc = crc32(crc, reinterpret_cast<const uint8_t*>(&kFabricatedOverlayCurrentVersion),
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sizeof(uint32_t));
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crc = crc32(crc, data.get(), size);
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data_ = SerializedData{std::move(data), size, crc};
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}
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return &(*data_);
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}
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Result<uint32_t> FabricatedOverlay::GetCrc() const {
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if (crc_from_disk_.has_value()) {
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return *crc_from_disk_;
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}
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auto data = InitializeData();
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if (!data) {
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return data.GetError();
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}
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return (*data)->crc;
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}
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Result<Unit> FabricatedOverlay::ToBinaryStream(std::ostream& stream) const {
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auto data = InitializeData();
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if (!data) {
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return data.GetError();
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}
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Write32(stream, kFabricatedOverlayMagic);
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Write32(stream, kFabricatedOverlayCurrentVersion);
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Write32(stream, (*data)->crc);
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stream.write(reinterpret_cast<const char*>((*data)->data.get()), (*data)->data_size);
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if (stream.bad()) {
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return Error("Failed to write serialized fabricated overlay.");
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}
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return Unit{};
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}
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using FabContainer = FabricatedOverlayContainer;
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FabContainer::FabricatedOverlayContainer(FabricatedOverlay&& overlay, std::string&& path)
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: overlay_(std::forward<FabricatedOverlay>(overlay)), path_(std::forward<std::string>(path)) {
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}
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FabContainer::~FabricatedOverlayContainer() = default;
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Result<std::unique_ptr<FabContainer>> FabContainer::FromPath(std::string path) {
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std::fstream fin(path);
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auto overlay = FabricatedOverlay::FromBinaryStream(fin);
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if (!overlay) {
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return overlay.GetError();
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}
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return std::unique_ptr<FabContainer>(
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new FabricatedOverlayContainer(std::move(*overlay), std::move(path)));
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}
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std::unique_ptr<FabricatedOverlayContainer> FabContainer::FromOverlay(FabricatedOverlay&& overlay) {
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return std::unique_ptr<FabContainer>(
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new FabricatedOverlayContainer(std::move(overlay), {} /* path */));
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}
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OverlayManifestInfo FabContainer::GetManifestInfo() const {
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const pb::FabricatedOverlay& overlay_pb = overlay_.overlay_pb_;
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return OverlayManifestInfo{
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.package_name = overlay_pb.package_name(),
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.name = overlay_pb.name(),
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.target_package = overlay_pb.target_package_name(),
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.target_name = overlay_pb.target_overlayable(),
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};
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}
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Result<OverlayManifestInfo> FabContainer::FindOverlayInfo(const std::string& name) const {
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const OverlayManifestInfo info = GetManifestInfo();
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if (name != info.name) {
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return Error("Failed to find name '%s' in fabricated overlay", name.c_str());
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}
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return info;
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}
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Result<OverlayData> FabContainer::GetOverlayData(const OverlayManifestInfo& info) const {
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const pb::FabricatedOverlay& overlay_pb = overlay_.overlay_pb_;
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if (info.name != overlay_pb.name()) {
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return Error("Failed to find name '%s' in fabricated overlay", info.name.c_str());
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}
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OverlayData result{};
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for (const auto& package : overlay_pb.packages()) {
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for (const auto& type : package.types()) {
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for (const auto& entry : type.entries()) {
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auto name = base::StringPrintf("%s:%s/%s", package.name().c_str(), type.name().c_str(),
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entry.name().c_str());
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const auto& res_value = entry.res_value();
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result.pairs.emplace_back(OverlayData::Value{
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name, TargetValue{.data_type = static_cast<uint8_t>(res_value.data_type()),
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.data_value = res_value.data_value()}});
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}
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}
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}
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return result;
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}
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Result<uint32_t> FabContainer::GetCrc() const {
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return overlay_.GetCrc();
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}
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const std::string& FabContainer::GetPath() const {
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return path_;
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}
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Result<std::string> FabContainer::GetResourceName(ResourceId /* id */) const {
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return Error("Fabricated overlay does not contain resources.");
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}
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} // namespace android::idmap2
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