1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/* lzo1x_d3.c -- LZO1X decompression with preset dictionary
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The LZO library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
#include "config1x.h"
#define LZO_TEST_OVERRUN 1
#define SLOW_MEMCPY(a,b,l) { do *a++ = *b++; while (--l > 0); }
#define FAST_MEMCPY(a,b,l) { lzo_memcpy(a,b,l); a += l; }
#if 1 && defined(FAST_MEMCPY)
# define DICT_MEMMOVE(op,m_pos,m_len,m_off) \
if (m_off >= (m_len)) \
FAST_MEMCPY(op,m_pos,m_len) \
else \
SLOW_MEMCPY(op,m_pos,m_len)
#else
# define DICT_MEMMOVE(op,m_pos,m_len,m_off) \
SLOW_MEMCPY(op,m_pos,m_len)
#endif
#if !defined(FAST_MEMCPY)
# define FAST_MEMCPY SLOW_MEMCPY
#endif
#define COPY_DICT_DICT(m_len,m_off) \
{ \
const lzo_bytep m_pos; \
m_off -= pd(op, out); assert(m_off > 0); \
if (m_off > dict_len) goto lookbehind_overrun; \
m_pos = dict_end - m_off; \
if (m_len > m_off) \
{ \
m_len -= m_off; \
FAST_MEMCPY(op,m_pos,m_off) \
m_pos = out; \
SLOW_MEMCPY(op,m_pos,m_len) \
} \
else \
FAST_MEMCPY(op,m_pos,m_len) \
}
#define COPY_DICT(m_len,m_off) \
assert(m_len >= 2); assert(m_off > 0); assert(op > out); \
if (m_off <= pd(op, out)) \
{ \
const lzo_bytep m_pos = op - m_off; \
DICT_MEMMOVE(op,m_pos,m_len,m_off) \
} \
else \
COPY_DICT_DICT(m_len,m_off)
LZO_PUBLIC(int)
lzo1x_decompress_dict_safe ( const lzo_bytep in, lzo_uint in_len,
lzo_bytep out, lzo_uintp out_len,
lzo_voidp wrkmem /* NOT USED */,
const lzo_bytep dict, lzo_uint dict_len)
#include "lzo1x_d.ch"
/* vim:set ts=4 sw=4 et: */
|
