openmohaa/code/qcommon/lz77.h

/*
===========================================================================
Copyright (C) 2015 the OpenMoHAA team

This file is part of OpenMoHAA source code.

OpenMoHAA source code 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.

OpenMoHAA source code 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 OpenMoHAA source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/

// lz77.h: LZ77 Compression Algorithm

#pragma once

#include <cstddef>

class cLZ77 {
	static unsigned int m_pDictionary[];

	unsigned char *ip;
	unsigned char *op;
	unsigned char *in_end;
	unsigned char *ip_end;
	unsigned char *ii;
	unsigned char *m_pos;
	unsigned int m_off;
	unsigned int m_len;
	unsigned int dindex;

public:
	cLZ77();

	int Compress( unsigned char *in, size_t in_len, unsigned char *out, size_t *out_len );
	int Decompress( unsigned char *in, size_t in_len, unsigned char *out, size_t *out_len );

private:
	unsigned int CompressData( unsigned char *in, size_t in_len, unsigned char *out, size_t *out_len );
};

extern cLZ77 g_lz77;