1ab598f46c
An early refactor. Some ideas became clearer as development continued. Now the various phases are much clearer and more easily reusable. Also added a ton of tests! Change-Id: Ic8f0a70c8222370352e63533b329c40457c0903e
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*
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* Copyright (C) 2015 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 "unflatten/ResChunkPullParser.h"
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#include "util/Util.h"
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#include <androidfw/ResourceTypes.h>
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#include <cstddef>
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namespace aapt {
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using android::ResChunk_header;
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ResChunkPullParser::Event ResChunkPullParser::next() {
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if (!isGoodEvent(mEvent)) {
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return mEvent;
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}
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if (mEvent == Event::StartDocument) {
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mCurrentChunk = mData;
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} else {
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mCurrentChunk = (const ResChunk_header*)
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(((const char*) mCurrentChunk) + util::deviceToHost32(mCurrentChunk->size));
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}
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const std::ptrdiff_t diff = (const char*) mCurrentChunk - (const char*) mData;
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assert(diff >= 0 && "diff is negative");
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const size_t offset = static_cast<const size_t>(diff);
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if (offset == mLen) {
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mCurrentChunk = nullptr;
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return (mEvent = Event::EndDocument);
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} else if (offset + sizeof(ResChunk_header) > mLen) {
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mLastError = "chunk is past the end of the document";
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mCurrentChunk = nullptr;
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return (mEvent = Event::BadDocument);
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}
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if (util::deviceToHost16(mCurrentChunk->headerSize) < sizeof(ResChunk_header)) {
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mLastError = "chunk has too small header";
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mCurrentChunk = nullptr;
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return (mEvent = Event::BadDocument);
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} else if (util::deviceToHost32(mCurrentChunk->size) <
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util::deviceToHost16(mCurrentChunk->headerSize)) {
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mLastError = "chunk's total size is smaller than header";
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mCurrentChunk = nullptr;
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return (mEvent = Event::BadDocument);
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} else if (offset + util::deviceToHost32(mCurrentChunk->size) > mLen) {
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mLastError = "chunk's data extends past the end of the document";
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mCurrentChunk = nullptr;
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return (mEvent = Event::BadDocument);
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}
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return (mEvent = Event::Chunk);
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}
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} // namespace aapt
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