128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/* lzo1_99.c -- implementation of the LZO1-99 algorithm
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This file is part of the LZO real-time data compression library.
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Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
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All Rights Reserved.
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The LZO library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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The LZO library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the LZO library; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Markus F.X.J. Oberhumer
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<markus@oberhumer.com>
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*/
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#include <lzoconf.h>
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#if !defined(LZO_99_UNSUPPORTED)
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#define COMPRESS_ID 99
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#define DDBITS 3
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#define CLEVEL 9
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/***********************************************************************
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//
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************************************************************************/
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#define LZO_NEED_DICT_H
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#include "config1.h"
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/***********************************************************************
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// compression internal entry point.
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************************************************************************/
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static int
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_lzo1_do_compress ( const lzo_byte *in, lzo_uint in_len,
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lzo_byte *out, lzo_uintp out_len,
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lzo_voidp wrkmem,
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lzo_compress_t func )
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{
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int r;
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/* don't try to compress a block that's too short */
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if (in_len <= 0)
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{
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*out_len = 0;
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r = LZO_E_OK;
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}
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else if (in_len <= MIN_LOOKAHEAD + 1)
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{
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#if defined(LZO_RETURN_IF_NOT_COMPRESSIBLE)
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*out_len = 0;
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r = LZO_E_NOT_COMPRESSIBLE;
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#else
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*out_len = STORE_RUN(out,in,in_len) - out;
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r = (*out_len > in_len) ? LZO_E_OK : LZO_E_ERROR;
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#endif
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}
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else
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r = func(in,in_len,out,out_len,wrkmem);
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return r;
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}
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/***********************************************************************
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//
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************************************************************************/
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#if !defined(COMPRESS_ID)
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#define COMPRESS_ID _LZO_ECONCAT2(DD_BITS,CLEVEL)
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#endif
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#define LZO_CODE_MATCH_INCLUDE_FILE "lzo1_cm.ch"
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#include "lzo1b_c.ch"
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/***********************************************************************
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//
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************************************************************************/
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#define LZO_COMPRESS \
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_LZO_ECONCAT3(lzo1_,COMPRESS_ID,_compress)
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#define LZO_COMPRESS_FUNC \
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_LZO_ECONCAT3(_lzo1_,COMPRESS_ID,_compress_func)
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/***********************************************************************
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//
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************************************************************************/
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LZO_PUBLIC(int)
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LZO_COMPRESS ( const lzo_byte *in, lzo_uint in_len,
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lzo_byte *out, lzo_uintp out_len,
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lzo_voidp wrkmem )
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{
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#if defined(__LZO_QUERY_COMPRESS)
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if (__LZO_IS_COMPRESS_QUERY(in,in_len,out,out_len,wrkmem))
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return __LZO_QUERY_COMPRESS(in,in_len,out,out_len,wrkmem,D_SIZE,lzo_sizeof(lzo_dict_t));
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#endif
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return _lzo1_do_compress(in,in_len,out,out_len,wrkmem,do_compress);
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}
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#endif
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/*
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vi:ts=4:et
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*/
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//martysama0134's 2e58d0b8baeb072acdf3afc4a5d1999f
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