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 95LZO_PUBLIC(int) 96lzo1x_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/* 106vi:ts=4:et 107*/ 108 109