release/src/router/lzo/src/lzo1a_99.c

   1 /* lzo1a_99.c -- implementation of the LZO1A-99 algorithm
   2
   3    This file is part of the LZO real-time data compression library.
   4
   5    Copyright (C) 1996-2015 Markus Franz Xaver Johannes Oberhumer
   6    All Rights Reserved.
   7
   8    The LZO library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2 of
  11    the License, or (at your option) any later version.
  12
  13    The LZO library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with the LZO library; see the file COPYING.
  20    If not, write to the Free Software Foundation, Inc.,
  21    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22
  23    Markus F.X.J. Oberhumer
  24    <markus@oberhumer.com>
  25    http://www.oberhumer.com/opensource/lzo/
  26  */
  27
  28
  29
  30 #define COMPRESS_ID     99
  31
  32 #define DDBITS          3
  33 #define CLEVEL          9
  34
  35
  36 /***********************************************************************
  37 //
  38 ************************************************************************/
  39
  40 #define LZO_NEED_DICT_H 1
  41 #include "config1a.h"
  42
  43
  44 /***********************************************************************
  45 // compression internal entry point.
  46 ************************************************************************/
  47
  48 static int
  49 _lzo1a_do_compress ( const lzo_bytep in,  lzo_uint  in_len,
  50                            lzo_bytep out, lzo_uintp out_len,
  51                            lzo_voidp wrkmem,
  52                            lzo_compress_t func )
  53 {
  54     int r;
  55
  56     /* don't try to compress a block that's too short */
  57     if (in_len == 0)
  58     {
  59         *out_len = 0;
  60         r = LZO_E_OK;
  61     }
  62     else if (in_len <= MIN_LOOKAHEAD + 1)
  63     {
  64 #if defined(LZO_RETURN_IF_NOT_COMPRESSIBLE)
  65         *out_len = 0;
  66         r = LZO_E_NOT_COMPRESSIBLE;
  67 #else
  68         *out_len = pd(STORE_RUN(out,in,in_len), out);
  69         r = (*out_len > in_len) ? LZO_E_OK : LZO_E_ERROR;
  70 #endif
  71     }
  72     else
  73         r = func(in,in_len,out,out_len,wrkmem);
  74
  75     return r;
  76 }
  77
  78
  79 /***********************************************************************
  80 //
  81 ************************************************************************/
  82
  83 #if !defined(COMPRESS_ID)
  84 #define COMPRESS_ID     _LZO_ECONCAT2(DD_BITS,CLEVEL)
  85 #endif
  86
  87
  88 #define LZO_CODE_MATCH_INCLUDE_FILE     "lzo1a_cm.ch"
  89 #include "lzo1b_c.ch"
  90
  91
  92 /***********************************************************************
  93 //
  94 ************************************************************************/
  95
  96 #define LZO_COMPRESS \
  97     LZO_PP_ECONCAT3(lzo1a_,COMPRESS_ID,_compress)
  98
  99 #define LZO_COMPRESS_FUNC \
 100     LZO_PP_ECONCAT3(_lzo1a_,COMPRESS_ID,_compress_func)
 101
 102
 103 /***********************************************************************
 104 //
 105 ************************************************************************/
 106
 107 LZO_PUBLIC(int)
 108 LZO_COMPRESS ( const lzo_bytep in,  lzo_uint  in_len,
 109                      lzo_bytep out, lzo_uintp out_len,
 110                      lzo_voidp wrkmem )
 111 {
 112     return _lzo1a_do_compress(in,in_len,out,out_len,wrkmem,do_compress);
 113 }
 114
 115
 116 /* vim:set ts=4 sw=4 et: */