69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
|
/*
|
||
|
|
* 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 "ResChunkPullParser.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 = reinterpret_cast<const ResChunk_header*>(
|
||
|
|
reinterpret_cast<const char*>(mCurrentChunk) + mCurrentChunk->size);
|
||
|
|
}
|
||
|
|
|
||
|
|
const std::ptrdiff_t diff = reinterpret_cast<const char*>(mCurrentChunk)
|
||
|
|
- reinterpret_cast<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 (mCurrentChunk->headerSize < sizeof(ResChunk_header)) {
|
||
|
|
mLastError = "chunk has too small header";
|
||
|
|
mCurrentChunk = nullptr;
|
||
|
|
return (mEvent = Event::BadDocument);
|
||
|
|
} else if (mCurrentChunk->size < mCurrentChunk->headerSize) {
|
||
|
|
mLastError = "chunk's total size is smaller than header";
|
||
|
|
mCurrentChunk = nullptr;
|
||
|
|
return (mEvent = Event::BadDocument);
|
||
|
|
} else if (offset + 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
|