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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 __HUFFDECOMPRESSOR_H__
#define __HUFFDECOMPRESSOR_H__
#include <string>
class ZLInputStream;
class BitReader;
class HuffDecompressor {
public:
HuffDecompressor(ZLInputStream& stream,
const std::vector<unsigned long>::const_iterator beginHuffRecordOffsetIt,
const std::vector<unsigned long>::const_iterator endHuffRecordOffsetIt,
const unsigned long endHuffDataOffset, const unsigned long extraFlags);
~HuffDecompressor();
std::size_t decompress(ZLInputStream &stream, char *buffer, std::size_t compressedSize, std::size_t maxUncompressedSize);
bool error() const;
private:
std::size_t sizeOfTrailingEntries(unsigned char* data, std::size_t size) const;
std::size_t readVariableWidthIntegerBE(unsigned char* ptr, std::size_t psize) const;
void bitsDecompress(BitReader bits, std::size_t depth = 0);
private:
unsigned long myEntryBits;
unsigned long myExtraFlags;
unsigned long* myCacheTable;
unsigned long* myBaseTable;
unsigned char* myData;
unsigned char** myDicts;
char* myTargetBuffer;
char* myTargetBufferEnd;
char* myTargetBufferPtr;
enum {
ERROR_NONE,
ERROR_CORRUPTED_FILE
} myErrorCode;
};
#endif /* __HUFFDECOMPRESSOR_H__ */
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