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) 1996-2014 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 (at) oberhumer.com> 25 http://www.oberhumer.com/opensource/lzo/ 26 */ 27 28 29 #include "config1x.h" 30 31 #define LZO_TEST_OVERRUN 1 32 33 34 #define SLOW_MEMCPY(a,b,l) { do *a++ = *b++; while (--l > 0); } 35 #define FAST_MEMCPY(a,b,l) { lzo_memcpy(a,b,l); a += l; } 36 37 #if 1 && defined(FAST_MEMCPY) 38 # define DICT_MEMMOVE(op,m_pos,m_len,m_off) \ 39 if (m_off >= (m_len)) \ 40 FAST_MEMCPY(op,m_pos,m_len) \ 41 else \ 42 SLOW_MEMCPY(op,m_pos,m_len) 43 #else 44 # define DICT_MEMMOVE(op,m_pos,m_len,m_off) \ 45 SLOW_MEMCPY(op,m_pos,m_len) 46 #endif 47 48 #if !defined(FAST_MEMCPY) 49 # define FAST_MEMCPY SLOW_MEMCPY 50 #endif 51 52 53 #define COPY_DICT_DICT(m_len,m_off) \ 54 { \ 55 const lzo_bytep m_pos; \ 56 m_off -= pd(op, out); assert(m_off > 0); \ 57 if (m_off > dict_len) goto lookbehind_overrun; \ 58 m_pos = dict_end - m_off; \ 59 if (m_len > m_off) \ 60 { \ 61 m_len -= m_off; \ 62 FAST_MEMCPY(op,m_pos,m_off) \ 63 m_pos = out; \ 64 SLOW_MEMCPY(op,m_pos,m_len) \ 65 } \ 66 else \ 67 FAST_MEMCPY(op,m_pos,m_len) \ 68 } 69 70 #define COPY_DICT(m_len,m_off) \ 71 assert(m_len >= 2); assert(m_off > 0); assert(op > out); \ 72 if (m_off <= pd(op, out)) \ 73 { \ 74 const lzo_bytep m_pos = op - m_off; \ 75 DICT_MEMMOVE(op,m_pos,m_len,m_off) \ 76 } \ 77 else \ 78 COPY_DICT_DICT(m_len,m_off) 79 80 81 82 83 LZO_PUBLIC(int) 84 lzo1x_decompress_dict_safe ( const lzo_bytep in, lzo_uint in_len, 85 lzo_bytep out, lzo_uintp out_len, 86 lzo_voidp wrkmem /* NOT USED */, 87 const lzo_bytep dict, lzo_uint dict_len) 88 89 90 #include "lzo1x_d.ch" 91 92 93 /* 94 vi:ts=4:et 95 */ 96 97
