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385 lines
13 KiB
385 lines
13 KiB
/*
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* Copyright (C) 2018 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/Idmap.h"
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#include <algorithm>
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#include <iostream>
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#include <iterator>
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#include <limits>
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#include <memory>
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#include <string>
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#include <utility>
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#include "android-base/macros.h"
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#include "androidfw/AssetManager2.h"
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#include "idmap2/ResourceMapping.h"
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#include "idmap2/ResourceUtils.h"
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#include "idmap2/Result.h"
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#include "idmap2/SysTrace.h"
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namespace android::idmap2 {
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namespace {
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bool WARN_UNUSED Read8(std::istream& stream, uint8_t* out) {
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uint8_t value;
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if (stream.read(reinterpret_cast<char*>(&value), sizeof(uint8_t))) {
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*out = 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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bool WARN_UNUSED Read16(std::istream& stream, uint16_t* out) {
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uint16_t value;
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if (stream.read(reinterpret_cast<char*>(&value), sizeof(uint16_t))) {
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*out = dtohs(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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bool WARN_UNUSED 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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bool WARN_UNUSED ReadString(std::istream& stream, std::string* out) {
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uint32_t size;
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if (!Read32(stream, &size)) {
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return false;
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}
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if (size == 0) {
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*out = "";
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return true;
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}
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std::string buf(size, '\0');
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if (!stream.read(buf.data(), size)) {
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return false;
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}
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uint32_t padding_size = CalculatePadding(size);
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std::string padding(padding_size, '\0');
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if (!stream.read(padding.data(), padding_size)) {
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return false;
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}
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*out = buf;
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return true;
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}
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} // namespace
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std::unique_ptr<const IdmapHeader> IdmapHeader::FromBinaryStream(std::istream& stream) {
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std::unique_ptr<IdmapHeader> idmap_header(new IdmapHeader());
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if (!Read32(stream, &idmap_header->magic_) || !Read32(stream, &idmap_header->version_)) {
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return nullptr;
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}
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if (idmap_header->magic_ != kIdmapMagic || idmap_header->version_ != kIdmapCurrentVersion) {
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// Do not continue parsing if the file is not a current version idmap.
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return nullptr;
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}
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uint32_t enforce_overlayable;
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if (!Read32(stream, &idmap_header->target_crc_) || !Read32(stream, &idmap_header->overlay_crc_) ||
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!Read32(stream, &idmap_header->fulfilled_policies_) ||
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!Read32(stream, &enforce_overlayable) || !ReadString(stream, &idmap_header->target_path_) ||
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!ReadString(stream, &idmap_header->overlay_path_) ||
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!ReadString(stream, &idmap_header->overlay_name_) ||
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!ReadString(stream, &idmap_header->debug_info_)) {
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return nullptr;
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}
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idmap_header->enforce_overlayable_ = enforce_overlayable != 0U;
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return std::move(idmap_header);
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}
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Result<Unit> IdmapHeader::IsUpToDate(const TargetResourceContainer& target,
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const OverlayResourceContainer& overlay,
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const std::string& overlay_name,
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PolicyBitmask fulfilled_policies,
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bool enforce_overlayable) const {
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const Result<uint32_t> target_crc = target.GetCrc();
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if (!target_crc) {
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return Error("failed to get target crc");
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}
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const Result<uint32_t> overlay_crc = overlay.GetCrc();
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if (!overlay_crc) {
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return Error("failed to get overlay crc");
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}
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return IsUpToDate(target.GetPath(), overlay.GetPath(), overlay_name, *target_crc, *overlay_crc,
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fulfilled_policies, enforce_overlayable);
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}
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Result<Unit> IdmapHeader::IsUpToDate(const std::string& target_path,
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const std::string& overlay_path,
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const std::string& overlay_name, uint32_t target_crc,
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uint32_t overlay_crc, PolicyBitmask fulfilled_policies,
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bool enforce_overlayable) const {
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if (magic_ != kIdmapMagic) {
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return Error("bad magic: actual 0x%08x, expected 0x%08x", magic_, kIdmapMagic);
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}
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if (version_ != kIdmapCurrentVersion) {
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return Error("bad version: actual 0x%08x, expected 0x%08x", version_, kIdmapCurrentVersion);
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}
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if (target_crc_ != target_crc) {
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return Error("bad target crc: idmap version 0x%08x, file system version 0x%08x", target_crc_,
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target_crc);
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}
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if (overlay_crc_ != overlay_crc) {
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return Error("bad overlay crc: idmap version 0x%08x, file system version 0x%08x", overlay_crc_,
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overlay_crc);
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}
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if (fulfilled_policies_ != fulfilled_policies) {
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return Error("bad fulfilled policies: idmap version 0x%08x, file system version 0x%08x",
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fulfilled_policies, fulfilled_policies_);
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}
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if (enforce_overlayable != enforce_overlayable_) {
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return Error("bad enforce overlayable: idmap version %s, file system version %s",
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enforce_overlayable ? "true" : "false", enforce_overlayable_ ? "true" : "false");
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}
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if (target_path != target_path_) {
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return Error("bad target path: idmap version %s, file system version %s", target_path.c_str(),
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target_path_.c_str());
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}
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if (overlay_path != overlay_path_) {
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return Error("bad overlay path: idmap version %s, file system version %s", overlay_path.c_str(),
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overlay_path_.c_str());
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}
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if (overlay_name != overlay_name_) {
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return Error("bad overlay name: idmap version %s, file system version %s", overlay_name.c_str(),
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overlay_name_.c_str());
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}
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return Unit{};
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}
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std::unique_ptr<const IdmapData::Header> IdmapData::Header::FromBinaryStream(std::istream& stream) {
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std::unique_ptr<IdmapData::Header> idmap_data_header(new IdmapData::Header());
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if (!Read32(stream, &idmap_data_header->target_entry_count) ||
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!Read32(stream, &idmap_data_header->target_entry_inline_count) ||
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!Read32(stream, &idmap_data_header->overlay_entry_count) ||
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!Read32(stream, &idmap_data_header->string_pool_index_offset)) {
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return nullptr;
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}
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return std::move(idmap_data_header);
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}
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std::unique_ptr<const IdmapData> IdmapData::FromBinaryStream(std::istream& stream) {
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std::unique_ptr<IdmapData> data(new IdmapData());
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data->header_ = IdmapData::Header::FromBinaryStream(stream);
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if (!data->header_) {
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return nullptr;
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}
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// Read the mapping of target resource id to overlay resource value.
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for (size_t i = 0; i < data->header_->GetTargetEntryCount(); i++) {
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TargetEntry target_entry{};
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if (!Read32(stream, &target_entry.target_id) || !Read32(stream, &target_entry.overlay_id)) {
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return nullptr;
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}
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data->target_entries_.push_back(target_entry);
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}
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// Read the mapping of target resource id to inline overlay values.
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uint8_t unused1;
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uint16_t unused2;
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for (size_t i = 0; i < data->header_->GetTargetInlineEntryCount(); i++) {
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TargetInlineEntry target_entry{};
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if (!Read32(stream, &target_entry.target_id) || !Read16(stream, &unused2) ||
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!Read8(stream, &unused1) || !Read8(stream, &target_entry.value.data_type) ||
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!Read32(stream, &target_entry.value.data_value)) {
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return nullptr;
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}
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data->target_inline_entries_.push_back(target_entry);
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}
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// Read the mapping of overlay resource id to target resource id.
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for (size_t i = 0; i < data->header_->GetOverlayEntryCount(); i++) {
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OverlayEntry overlay_entry{};
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if (!Read32(stream, &overlay_entry.overlay_id) || !Read32(stream, &overlay_entry.target_id)) {
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return nullptr;
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}
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data->overlay_entries_.emplace_back(overlay_entry);
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}
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// Read raw string pool bytes.
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if (!ReadString(stream, &data->string_pool_data_)) {
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return nullptr;
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}
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return std::move(data);
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}
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std::string Idmap::CanonicalIdmapPathFor(const std::string& absolute_dir,
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const std::string& absolute_apk_path) {
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assert(absolute_dir.size() > 0 && absolute_dir[0] == "/");
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assert(absolute_apk_path.size() > 0 && absolute_apk_path[0] == "/");
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std::string copy(++absolute_apk_path.cbegin(), absolute_apk_path.cend());
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replace(copy.begin(), copy.end(), '/', '@');
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return absolute_dir + "/" + copy + "@idmap";
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}
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Result<std::unique_ptr<const Idmap>> Idmap::FromBinaryStream(std::istream& stream) {
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SYSTRACE << "Idmap::FromBinaryStream";
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std::unique_ptr<Idmap> idmap(new Idmap());
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idmap->header_ = IdmapHeader::FromBinaryStream(stream);
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if (!idmap->header_) {
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return Error("failed to parse idmap header");
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}
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// idmap version 0x01 does not specify the number of data blocks that follow
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// the idmap header; assume exactly one data block
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for (int i = 0; i < 1; i++) {
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std::unique_ptr<const IdmapData> data = IdmapData::FromBinaryStream(stream);
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if (!data) {
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return Error("failed to parse data block %d", i);
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}
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idmap->data_.push_back(std::move(data));
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}
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return {std::move(idmap)};
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}
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Result<std::unique_ptr<const IdmapData>> IdmapData::FromResourceMapping(
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const ResourceMapping& resource_mapping) {
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if (resource_mapping.GetTargetToOverlayMap().empty()) {
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return Error("no resources were overlaid");
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}
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std::unique_ptr<IdmapData> data(new IdmapData());
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data->string_pool_data_ = resource_mapping.GetStringPoolData().to_string();
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for (const auto& mapping : resource_mapping.GetTargetToOverlayMap()) {
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if (auto overlay_resource = std::get_if<ResourceId>(&mapping.second)) {
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data->target_entries_.push_back({mapping.first, *overlay_resource});
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} else {
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data->target_inline_entries_.push_back(
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{mapping.first, std::get<TargetValue>(mapping.second)});
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}
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}
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for (const auto& mapping : resource_mapping.GetOverlayToTargetMap()) {
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data->overlay_entries_.emplace_back(IdmapData::OverlayEntry{mapping.first, mapping.second});
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}
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std::unique_ptr<IdmapData::Header> data_header(new IdmapData::Header());
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data_header->target_entry_count = static_cast<uint32_t>(data->target_entries_.size());
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data_header->target_entry_inline_count =
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static_cast<uint32_t>(data->target_inline_entries_.size());
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data_header->overlay_entry_count = static_cast<uint32_t>(data->overlay_entries_.size());
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data_header->string_pool_index_offset = resource_mapping.GetStringPoolOffset();
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data->header_ = std::move(data_header);
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return {std::move(data)};
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}
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Result<std::unique_ptr<const Idmap>> Idmap::FromContainers(const TargetResourceContainer& target,
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const OverlayResourceContainer& overlay,
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const std::string& overlay_name,
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const PolicyBitmask& fulfilled_policies,
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bool enforce_overlayable) {
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SYSTRACE << "Idmap::FromApkAssets";
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std::unique_ptr<IdmapHeader> header(new IdmapHeader());
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header->magic_ = kIdmapMagic;
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header->version_ = kIdmapCurrentVersion;
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const auto target_crc = target.GetCrc();
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if (!target_crc) {
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return Error(target_crc.GetError(), "failed to get zip CRC for '%s'", target.GetPath().data());
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}
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header->target_crc_ = *target_crc;
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const auto overlay_crc = overlay.GetCrc();
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if (!overlay_crc) {
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return Error(overlay_crc.GetError(), "failed to get zip CRC for '%s'",
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overlay.GetPath().data());
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}
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header->overlay_crc_ = *overlay_crc;
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header->fulfilled_policies_ = fulfilled_policies;
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header->enforce_overlayable_ = enforce_overlayable;
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header->target_path_ = target.GetPath();
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header->overlay_path_ = overlay.GetPath();
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header->overlay_name_ = overlay_name;
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auto info = overlay.FindOverlayInfo(overlay_name);
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if (!info) {
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return Error(info.GetError(), "failed to get overlay info for '%s'", overlay.GetPath().data());
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}
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LogInfo log_info;
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auto resource_mapping = ResourceMapping::FromContainers(
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target, overlay, *info, fulfilled_policies, enforce_overlayable, log_info);
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if (!resource_mapping) {
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return Error(resource_mapping.GetError(), "failed to generate resource map for '%s'",
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overlay.GetPath().data());
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}
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auto idmap_data = IdmapData::FromResourceMapping(*resource_mapping);
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if (!idmap_data) {
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return idmap_data.GetError();
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}
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std::unique_ptr<Idmap> idmap(new Idmap());
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header->debug_info_ = log_info.GetString();
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idmap->header_ = std::move(header);
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idmap->data_.push_back(std::move(*idmap_data));
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return {std::move(idmap)};
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}
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void IdmapHeader::accept(Visitor* v) const {
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assert(v != nullptr);
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v->visit(*this);
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}
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void IdmapData::Header::accept(Visitor* v) const {
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assert(v != nullptr);
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v->visit(*this);
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}
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void IdmapData::accept(Visitor* v) const {
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assert(v != nullptr);
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header_->accept(v);
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v->visit(*this);
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}
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void Idmap::accept(Visitor* v) const {
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assert(v != nullptr);
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header_->accept(v);
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v->visit(*this);
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auto end = data_.cend();
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for (auto iter = data_.cbegin(); iter != end; ++iter) {
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(*iter)->accept(v);
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}
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}
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} // namespace android::idmap2
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