release/src/router/lzo/src/lzo1_99.c

   1 /* lzo1_99.c -- implementation of the LZO1-99 algorithm
   2
   3    This file is part of the LZO real-time data compression library.
   4
   5    Copyright (C) 2011 Markus Franz Xaver Johannes Oberhumer
   6    Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
   7    Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
   8    Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
   9    Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
  10    Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
  11    Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
  12    Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
  13    Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
  14    Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
  15    Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
  16    Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
  17    Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
  18    Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
  19    Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
  20    Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
  21    All Rights Reserved.
  22
  23    The LZO library is free software; you can redistribute it and/or
  24    modify it under the terms of the GNU General Public License as
  25    published by the Free Software Foundation; either version 2 of
  26    the License, or (at your option) any later version.
  27
  28    The LZO library is distributed in the hope that it will be useful,
  29    but WITHOUT ANY WARRANTY; without even the implied warranty of
  30    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  31    GNU General Public License for more details.
  32
  33    You should have received a copy of the GNU General Public License
  34    along with the LZO library; see the file COPYING.
  35    If not, write to the Free Software Foundation, Inc.,
  36    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  37
  38    Markus F.X.J. Oberhumer
  39    <markus@oberhumer.com>
  40    http://www.oberhumer.com/opensource/lzo/
  41  */
  42
  43
  44
  45 #define COMPRESS_ID     99
  46
  47 #define DDBITS          3
  48 #define CLEVEL          9
  49
  50
  51 /***********************************************************************
  52 //
  53 ************************************************************************/
  54
  55 #define LZO_NEED_DICT_H 1
  56 #include "config1.h"
  57
  58
  59 /***********************************************************************
  60 // compression internal entry point.
  61 ************************************************************************/
  62
  63 static int
  64 _lzo1_do_compress ( const lzo_bytep in,  lzo_uint  in_len,
  65                           lzo_bytep out, lzo_uintp out_len,
  66                           lzo_voidp wrkmem,
  67                           lzo_compress_t func )
  68 {
  69     int r;
  70
  71     /* don't try to compress a block that's too short */
  72     if (in_len == 0)
  73     {
  74         *out_len = 0;
  75         r = LZO_E_OK;
  76     }
  77     else if (in_len <= MIN_LOOKAHEAD + 1)
  78     {
  79 #if defined(LZO_RETURN_IF_NOT_COMPRESSIBLE)
  80         *out_len = 0;
  81         r = LZO_E_NOT_COMPRESSIBLE;
  82 #else
  83         *out_len = pd(STORE_RUN(out,in,in_len), out);
  84         r = (*out_len > in_len) ? LZO_E_OK : LZO_E_ERROR;
  85 #endif
  86     }
  87     else
  88         r = func(in,in_len,out,out_len,wrkmem);
  89
  90     return r;
  91 }
  92
  93
  94 /***********************************************************************
  95 //
  96 ************************************************************************/
  97
  98 #if !defined(COMPRESS_ID)
  99 #define COMPRESS_ID     _LZO_ECONCAT2(DD_BITS,CLEVEL)
 100 #endif
 101
 102
 103 #define LZO_CODE_MATCH_INCLUDE_FILE     "lzo1_cm.ch"
 104 #include "lzo1b_c.ch"
 105
 106
 107 /***********************************************************************
 108 //
 109 ************************************************************************/
 110
 111 #define LZO_COMPRESS \
 112     LZO_CPP_ECONCAT3(lzo1_,COMPRESS_ID,_compress)
 113
 114 #define LZO_COMPRESS_FUNC \
 115     LZO_CPP_ECONCAT3(_lzo1_,COMPRESS_ID,_compress_func)
 116
 117
 118 /***********************************************************************
 119 //
 120 ************************************************************************/
 121
 122 LZO_PUBLIC(int)
 123 LZO_COMPRESS ( const lzo_bytep in,  lzo_uint  in_len,
 124                      lzo_bytep out, lzo_uintp out_len,
 125                      lzo_voidp wrkmem )
 126 {
 127     return _lzo1_do_compress(in,in_len,out,out_len,wrkmem,do_compress);
 128 }
 129
 130
 131 /*
 132 vi:ts=4:et
 133 */