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/*
* Copyright (C) 2004-2012 Geometer Plus <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#ifndef __LZXDECOMPRESSOR_H__
#define __LZXDECOMPRESSOR_H__
#include <string>
#include <vector>
#include "BitStream.h"
#include "HuffmanDecoder.h"
class LZXDecompressor {
public:
LZXDecompressor(int windowSizeIndex);
void reset();
bool decompress(const std::string &data, unsigned char *outBuffer, const std::size_t outSize);
private:
struct DecodingState {
std::vector<unsigned char>::iterator WindowIterator;
unsigned int R0;
unsigned int R1;
unsigned int R2;
};
bool readLengths(HuffmanDecoder &decoder, std::size_t from, std::size_t size);
bool decodeBytes(DecodingState &state, std::size_t bytesToDecode);
private:
enum BlockType {
UNKNOWNN = 0,
VERBATIM = 1,
ALIGNED = 2,
UNCOMPRESSED = 3
};
BlockType myCurrentBlockType;
bool myReadHeader;
std::vector<unsigned char> myWindow;
DecodingState myState;
std::size_t myBlockSize;
std::size_t myBlockBytesLeft;
const unsigned int mySlotNumber;
HuffmanDecoder myMainTree;
HuffmanDecoder myLengthTree;
HuffmanDecoder myAlignedOffsetTree;
BitStream myBitStream;
class E8Decoder {
public:
void reset(unsigned int fileSize);
void decode(unsigned char *buffer, const std::size_t size);
private:
unsigned int myFramesCounter;
unsigned int myFileSize;
unsigned int myPosition;
};
E8Decoder myE8Decoder;
};
#endif /* __LZXDECOMPRESSOR_H__ */
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