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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 "unflatten/ResChunkPullParser.h"
#include "util/Util.h"
#include <androidfw/ResourceTypes.h>
#include <cstddef>
namespace aapt {
using android::ResChunk_header;
ResChunkPullParser::Event ResChunkPullParser::next() {
if (!isGoodEvent(mEvent)) {
return mEvent;
}
if (mEvent == Event::StartDocument) {
mCurrentChunk = mData;
} else {
mCurrentChunk = (const ResChunk_header*)
(((const char*) mCurrentChunk) + util::deviceToHost32(mCurrentChunk->size));
}
const std::ptrdiff_t diff = (const char*) mCurrentChunk - (const char*) mData;
assert(diff >= 0 && "diff is negative");
const size_t offset = static_cast<const size_t>(diff);
if (offset == mLen) {
mCurrentChunk = nullptr;
return (mEvent = Event::EndDocument);
} else if (offset + sizeof(ResChunk_header) > mLen) {
mLastError = "chunk is past the end of the document";
mCurrentChunk = nullptr;
return (mEvent = Event::BadDocument);
}
if (util::deviceToHost16(mCurrentChunk->headerSize) < sizeof(ResChunk_header)) {
mLastError = "chunk has too small header";
mCurrentChunk = nullptr;
return (mEvent = Event::BadDocument);
} else if (util::deviceToHost32(mCurrentChunk->size) <
util::deviceToHost16(mCurrentChunk->headerSize)) {
mLastError = "chunk's total size is smaller than header";
mCurrentChunk = nullptr;
return (mEvent = Event::BadDocument);
} else if (offset + util::deviceToHost32(mCurrentChunk->size) > mLen) {
mLastError = "chunk's data extends past the end of the document";
mCurrentChunk = nullptr;
return (mEvent = Event::BadDocument);
}
return (mEvent = Event::Chunk);
}
} // namespace aapt
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