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/*
* Copyright (C) 2018 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 "idmap2/BinaryStreamVisitor.h"
#include <algorithm>
#include <cstring>
#include <string>
#include "android-base/macros.h"
namespace android::idmap2 {
void BinaryStreamVisitor::Write(const void* value, size_t length) {
stream_.write(reinterpret_cast<const char*>(value), length);
}
void BinaryStreamVisitor::Write8(uint8_t value) {
stream_.write(reinterpret_cast<char*>(&value), sizeof(uint8_t));
}
void BinaryStreamVisitor::Write16(uint16_t value) {
uint16_t x = htodl(value);
stream_.write(reinterpret_cast<char*>(&x), sizeof(uint16_t));
}
void BinaryStreamVisitor::Write32(uint32_t value) {
uint32_t x = htodl(value);
stream_.write(reinterpret_cast<char*>(&x), sizeof(uint32_t));
}
void BinaryStreamVisitor::WriteString256(const StringPiece& value) {
char buf[kIdmapStringLength];
memset(buf, 0, sizeof(buf));
memcpy(buf, value.data(), std::min(value.size(), sizeof(buf)));
stream_.write(buf, sizeof(buf));
}
void BinaryStreamVisitor::WriteString(const std::string& value) {
// pad with null to nearest word boundary; include at least one terminating null
size_t padding_size = 4 - (value.size() % 4);
Write32(value.size() + padding_size);
stream_.write(value.c_str(), value.size());
stream_.write("\0\0\0\0", padding_size);
}
void BinaryStreamVisitor::visit(const Idmap& idmap ATTRIBUTE_UNUSED) {
// nothing to do
}
void BinaryStreamVisitor::visit(const IdmapHeader& header) {
Write32(header.GetMagic());
Write32(header.GetVersion());
Write32(header.GetTargetCrc());
Write32(header.GetOverlayCrc());
Write32(header.GetFulfilledPolicies());
Write8(static_cast<uint8_t>(header.GetEnforceOverlayable()));
WriteString256(header.GetTargetPath());
WriteString256(header.GetOverlayPath());
WriteString(header.GetDebugInfo());
}
void BinaryStreamVisitor::visit(const IdmapData& data) {
for (const auto& target_entry : data.GetTargetEntries()) {
Write32(target_entry.target_id);
Write8(target_entry.data_type);
Write32(target_entry.data_value);
}
for (const auto& overlay_entry : data.GetOverlayEntries()) {
Write32(overlay_entry.overlay_id);
Write32(overlay_entry.target_id);
}
Write(data.GetStringPoolData(), data.GetHeader()->GetStringPoolLength());
}
void BinaryStreamVisitor::visit(const IdmapData::Header& header) {
Write8(header.GetTargetPackageId());
Write8(header.GetOverlayPackageId());
Write32(header.GetTargetEntryCount());
Write32(header.GetOverlayEntryCount());
Write32(header.GetStringPoolIndexOffset());
Write32(header.GetStringPoolLength());
}
} // namespace android::idmap2
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