lz77.h

/*
===========================================================================
Copyright (C) 2025 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;