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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.
*/
#ifndef AAPT_FORMAT_BINARY_RESCHUNKPULLPARSER_H
#define AAPT_FORMAT_BINARY_RESCHUNKPULLPARSER_H
#include <string>
#include "android-base/macros.h"
#include "androidfw/ResourceTypes.h"
#include "util/Util.h"
namespace aapt {
// A pull parser, modeled after XmlPullParser, that reads android::ResChunk_header structs from a
// block of data.
// An android::ResChunk_header specifies a type, headerSize, and size. The pull parser will verify
// that the chunk's size doesn't extend beyond the available data, and will iterate over each chunk
// in the given block of data.
// Processing nested chunks is done by creating a new ResChunkPullParser pointing to the data
// portion of a chunk.
class ResChunkPullParser {
public:
enum class Event {
kStartDocument,
kEndDocument,
kBadDocument,
kChunk,
};
// Returns false if the event is EndDocument or BadDocument.
static bool IsGoodEvent(Event event);
// Create a ResChunkPullParser to read android::ResChunk_headers from the memory pointed to by
// data, of len bytes.
ResChunkPullParser(const void* data, size_t len);
Event event() const;
const std::string& error() const;
const android::ResChunk_header* chunk() const;
// Move to the next android::ResChunk_header.
Event Next();
private:
DISALLOW_COPY_AND_ASSIGN(ResChunkPullParser);
Event event_;
const android::ResChunk_header* data_;
size_t len_;
const android::ResChunk_header* current_chunk_;
std::string error_;
};
template <typename T, size_t MinSize = sizeof(T)>
inline static const T* ConvertTo(const android::ResChunk_header* chunk) {
if (util::DeviceToHost16(chunk->headerSize) < MinSize) {
return nullptr;
}
return reinterpret_cast<const T*>(chunk);
}
inline static const uint8_t* GetChunkData(const android::ResChunk_header* chunk) {
return reinterpret_cast<const uint8_t*>(chunk) + util::DeviceToHost16(chunk->headerSize);
}
inline static uint32_t GetChunkDataLen(const android::ResChunk_header* chunk) {
return util::DeviceToHost32(chunk->size) - util::DeviceToHost16(chunk->headerSize);
}
//
// Implementation
//
inline bool ResChunkPullParser::IsGoodEvent(ResChunkPullParser::Event event) {
return event != Event::kEndDocument && event != Event::kBadDocument;
}
inline ResChunkPullParser::ResChunkPullParser(const void* data, size_t len)
: event_(Event::kStartDocument),
data_(reinterpret_cast<const android::ResChunk_header*>(data)),
len_(len),
current_chunk_(nullptr) {
}
inline ResChunkPullParser::Event ResChunkPullParser::event() const {
return event_;
}
inline const std::string& ResChunkPullParser::error() const {
return error_;
}
inline const android::ResChunk_header* ResChunkPullParser::chunk() const {
return current_chunk_;
}
} // namespace aapt
#endif // AAPT_FORMAT_BINARY_RESCHUNKPULLPARSER_H
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