lzo-2.03/src/lzo1a_99.c

/* lzo1a_99.c -- implementation of the LZO1A-99 algorithm

   This file is part of the LZO real-time data compression library.

   Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
   All Rights Reserved.

   The LZO library 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.

   The LZO library 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 the LZO library; see the file COPYING.
   If not, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

   Markus F.X.J. Oberhumer
   <markus@oberhumer.com>
   http://www.oberhumer.com/opensource/lzo/
 */



#define COMPRESS_ID     99

#define DDBITS          3
#define CLEVEL          9


/***********************************************************************
//
************************************************************************/

#define LZO_NEED_DICT_H
#include "config1a.h"


/***********************************************************************
// compression internal entry point.
************************************************************************/

static int
_lzo1a_do_compress ( const lzo_bytep in,  lzo_uint  in_len,
                           lzo_bytep out, lzo_uintp out_len,
                           lzo_voidp wrkmem,
                           lzo_compress_t func )
{
    int r;

    /* don't try to compress a block that's too short */
    if (in_len <= 0)
    {
        *out_len = 0;
        r = LZO_E_OK;
    }
    else if (in_len <= MIN_LOOKAHEAD + 1)
    {
#if defined(LZO_RETURN_IF_NOT_COMPRESSIBLE)
        *out_len = 0;
        r = LZO_E_NOT_COMPRESSIBLE;
#else
        *out_len = pd(STORE_RUN(out,in,in_len), out);
        r = (*out_len > in_len) ? LZO_E_OK : LZO_E_ERROR;
#endif
    }
    else
        r = func(in,in_len,out,out_len,wrkmem);

    return r;
}


/***********************************************************************
//
************************************************************************/

#if !defined(COMPRESS_ID)
#define COMPRESS_ID     _LZO_ECONCAT2(DD_BITS,CLEVEL)
#endif


#define LZO_CODE_MATCH_INCLUDE_FILE     "lzo1a_cm.ch"
#include "lzo1b_c.ch"


/***********************************************************************
//
************************************************************************/

#define LZO_COMPRESS \
    LZO_CPP_ECONCAT3(lzo1a_,COMPRESS_ID,_compress)

#define LZO_COMPRESS_FUNC \
    LZO_CPP_ECONCAT3(_lzo1a_,COMPRESS_ID,_compress_func)


/***********************************************************************
//
************************************************************************/

LZO_PUBLIC(int)
LZO_COMPRESS ( const lzo_bytep in,  lzo_uint  in_len,
                     lzo_bytep out, lzo_uintp out_len,
                     lzo_voidp wrkmem )
{
    return _lzo1a_do_compress(in,in_len,out,out_len,wrkmem,do_compress);
}


/*
vi:ts=4:et
*/