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/*
* Copyright (C) 2015 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 "format/binary/ResChunkPullParser.h"
#include <inttypes.h>
#include <cstddef>
#include "android-base/logging.h"
#include "android-base/stringprintf.h"
#include "androidfw/ResourceTypes.h"
#include "util/Util.h"
namespace aapt {
using android::ResChunk_header;
using android::base::StringPrintf;
static std::string ChunkHeaderDump(const ResChunk_header* header) {
return StringPrintf("(type=%02" PRIx16 " header_size=%" PRIu16 " size=%" PRIu32 ")",
util::DeviceToHost16(header->type), util::DeviceToHost16(header->headerSize),
util::DeviceToHost32(header->size));
}
ResChunkPullParser::Event ResChunkPullParser::Next() {
if (!IsGoodEvent(event_)) {
return event_;
}
if (event_ == Event::kStartDocument) {
current_chunk_ = data_;
} else {
current_chunk_ = (const ResChunk_header*)(((const char*)current_chunk_) +
util::DeviceToHost32(current_chunk_->size));
}
const std::ptrdiff_t diff = (const char*)current_chunk_ - (const char*)data_;
CHECK(diff >= 0) << "diff is negative";
const size_t offset = static_cast<const size_t>(diff);
if (offset == len_) {
current_chunk_ = nullptr;
return (event_ = Event::kEndDocument);
} else if (offset + sizeof(ResChunk_header) > len_) {
error_ = "chunk is past the end of the document";
current_chunk_ = nullptr;
return (event_ = Event::kBadDocument);
}
if (util::DeviceToHost16(current_chunk_->headerSize) < sizeof(ResChunk_header)) {
error_ = "chunk has too small header";
current_chunk_ = nullptr;
return (event_ = Event::kBadDocument);
} else if (util::DeviceToHost32(current_chunk_->size) <
util::DeviceToHost16(current_chunk_->headerSize)) {
error_ = "chunk's total size is smaller than header " + ChunkHeaderDump(current_chunk_);
current_chunk_ = nullptr;
return (event_ = Event::kBadDocument);
} else if (offset + util::DeviceToHost32(current_chunk_->size) > len_) {
error_ = "chunk's data extends past the end of the document " + ChunkHeaderDump(current_chunk_);
current_chunk_ = nullptr;
return (event_ = Event::kBadDocument);
}
return (event_ = Event::kChunk);
}
} // namespace aapt
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