lzo/src/lzo1x_d3.c

   1 /* lzo1x_d3.c -- LZO1X decompression with preset dictionary
   2
   3    This file is part of the LZO real-time data compression library.
   4
   5    Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
   6    Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
   7    Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
   8    Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
   9    Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
  10    Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
  11    Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
  12    Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
  13    Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
  14    Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
  15    Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
  16    Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
  17    Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
  18    All Rights Reserved.
  19
  20    The LZO library is free software; you can redistribute it and/or
  21    modify it under the terms of the GNU General Public License as
  22    published by the Free Software Foundation; either version 2 of
  23    the License, or (at your option) any later version.
  24
  25    The LZO library is distributed in the hope that it will be useful,
  26    but WITHOUT ANY WARRANTY; without even the implied warranty of
  27    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28    GNU General Public License for more details.
  29
  30    You should have received a copy of the GNU General Public License
  31    along with the LZO library; see the file COPYING.
  32    If not, write to the Free Software Foundation, Inc.,
  33    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  34
  35    Markus F.X.J. Oberhumer
  36    <markus@oberhumer.com>
  37    http://www.oberhumer.com/opensource/lzo/
  38  */
  39
  40
  41 #include "config1x.h"
  42
  43 #define LZO_TEST_OVERRUN
  44
  45
  46 #define SLOW_MEMCPY(a,b,l)      { do *a++ = *b++; while (--l > 0); }
  47 #define FAST_MEMCPY(a,b,l)      { lzo_memcpy(a,b,l); a += l; }
  48
  49 #if 1 && defined(FAST_MEMCPY)
  50 #  define DICT_MEMMOVE(op,m_pos,m_len,m_off) \
  51         if (m_off >= (m_len)) \
  52             FAST_MEMCPY(op,m_pos,m_len) \
  53         else \
  54             SLOW_MEMCPY(op,m_pos,m_len)
  55 #else
  56 #  define DICT_MEMMOVE(op,m_pos,m_len,m_off) \
  57         SLOW_MEMCPY(op,m_pos,m_len)
  58 #endif
  59
  60 #if !defined(FAST_MEMCPY)
  61 #  define FAST_MEMCPY   SLOW_MEMCPY
  62 #endif
  63
  64
  65 #define COPY_DICT_DICT(m_len,m_off) \
  66     { \
  67         register const lzo_bytep m_pos; \
  68         m_off -= pd(op, out); assert(m_off > 0); \
  69         if (m_off > dict_len) goto lookbehind_overrun; \
  70         m_pos = dict_end - m_off; \
  71         if (m_len > m_off) \
  72         { \
  73             m_len -= m_off; \
  74             FAST_MEMCPY(op,m_pos,m_off) \
  75             m_pos = out; \
  76             SLOW_MEMCPY(op,m_pos,m_len) \
  77         } \
  78         else \
  79             FAST_MEMCPY(op,m_pos,m_len) \
  80     }
  81
  82 #define COPY_DICT(m_len,m_off) \
  83     assert(m_len >= 2); assert(m_off > 0); assert(op > out); \
  84     if (m_off <= pd(op, out)) \
  85     { \
  86         register const lzo_bytep m_pos = op - m_off; \
  87         DICT_MEMMOVE(op,m_pos,m_len,m_off) \
  88     } \
  89     else \
  90         COPY_DICT_DICT(m_len,m_off)
  91
  92
  93
  94
  95 LZO_PUBLIC(int)
  96 lzo1x_decompress_dict_safe ( const lzo_bytep in,  lzo_uint  in_len,
  97                                    lzo_bytep out, lzo_uintp out_len,
  98                                    lzo_voidp wrkmem /* NOT USED */,
  99                              const lzo_bytep dict, lzo_uint dict_len)
 100
 101
 102 #include "lzo1x_d.ch"
 103
 104
 105 /*
 106 vi:ts=4:et
 107 */
 108