release/src/router/lzo/src/lzo1b_xx.c

   1 /* lzo1b_xx.c -- LZO1B compression public entry point
   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 #include "config1b.h"
  30
  31
  32 /***********************************************************************
  33 //
  34 ************************************************************************/
  35
  36 static const lzo_compress_t * const c_funcs [9] =
  37 {
  38     &_lzo1b_1_compress_func,
  39     &_lzo1b_2_compress_func,
  40     &_lzo1b_3_compress_func,
  41     &_lzo1b_4_compress_func,
  42     &_lzo1b_5_compress_func,
  43     &_lzo1b_6_compress_func,
  44     &_lzo1b_7_compress_func,
  45     &_lzo1b_8_compress_func,
  46     &_lzo1b_9_compress_func
  47 };
  48
  49
  50 static lzo_compress_t lzo1b_get_compress_func(int clevel)
  51 {
  52     const lzo_compress_t *f;
  53
  54     if (clevel < LZO1B_BEST_SPEED || clevel > LZO1B_BEST_COMPRESSION)
  55     {
  56         if (clevel == LZO1B_DEFAULT_COMPRESSION)
  57             clevel = LZO1B_BEST_SPEED;
  58         else
  59             return (lzo_compress_t) 0;
  60     }
  61     f = c_funcs[clevel-1];
  62     assert(f && *f);
  63     return *f;
  64 }
  65
  66
  67 LZO_PUBLIC(int)
  68 lzo1b_compress ( const lzo_bytep src, lzo_uint  src_len,
  69                        lzo_bytep dst, lzo_uintp dst_len,
  70                        lzo_voidp wrkmem,
  71                        int clevel )
  72 {
  73     lzo_compress_t f;
  74
  75     f = lzo1b_get_compress_func(clevel);
  76     if (!f)
  77         return LZO_E_ERROR;
  78     return _lzo1b_do_compress(src,src_len,dst,dst_len,wrkmem,f);
  79 }
  80
  81
  82 /* vim:set ts=4 sw=4 et: */