]> git.saurik.com Git - redis.git/blame - src/lzf_d.c
rdbLoad() should check REDIS_RDB_VERSION instead of hardcoded number.
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d0751937 1/*
2 * Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de>
3 *
4 * Redistribution and use in source and binary forms, with or without modifica-
5 * tion, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 *
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
16 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
17 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
18 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
22 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
23 * OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * Alternatively, the contents of this file may be used under the terms of
26 * the GNU General Public License ("GPL") version 2 or any later version,
27 * in which case the provisions of the GPL are applicable instead of
28 * the above. If you wish to allow the use of your version of this file
29 * only under the terms of the GPL and not to allow others to use your
30 * version of this file under the BSD license, indicate your decision
31 * by deleting the provisions above and replace them with the notice
32 * and other provisions required by the GPL. If you do not delete the
33 * provisions above, a recipient may use your version of this file under
34 * either the BSD or the GPL.
35 */
36
37#include "lzfP.h"
38
39#if AVOID_ERRNO
40# define SET_ERRNO(n)
41#else
42# include <errno.h>
43# define SET_ERRNO(n) errno = (n)
44#endif
45
46/*
47#if (__i386 || __amd64) && __GNUC__ >= 3
48# define lzf_movsb(dst, src, len) \
49 asm ("rep movsb" \
50 : "=D" (dst), "=S" (src), "=c" (len) \
51 : "0" (dst), "1" (src), "2" (len));
52#endif
53*/
54
55unsigned int
56lzf_decompress (const void *const in_data, unsigned int in_len,
57 void *out_data, unsigned int out_len)
58{
59 u8 const *ip = (const u8 *)in_data;
60 u8 *op = (u8 *)out_data;
61 u8 const *const in_end = ip + in_len;
62 u8 *const out_end = op + out_len;
63
64 do
65 {
66 unsigned int ctrl = *ip++;
67
68 if (ctrl < (1 << 5)) /* literal run */
69 {
70 ctrl++;
71
72 if (op + ctrl > out_end)
73 {
74 SET_ERRNO (E2BIG);
75 return 0;
76 }
77
78#if CHECK_INPUT
79 if (ip + ctrl > in_end)
80 {
81 SET_ERRNO (EINVAL);
82 return 0;
83 }
84#endif
85
86#ifdef lzf_movsb
87 lzf_movsb (op, ip, ctrl);
88#else
89 do
90 *op++ = *ip++;
91 while (--ctrl);
92#endif
93 }
94 else /* back reference */
95 {
96 unsigned int len = ctrl >> 5;
97
98 u8 *ref = op - ((ctrl & 0x1f) << 8) - 1;
99
100#if CHECK_INPUT
101 if (ip >= in_end)
102 {
103 SET_ERRNO (EINVAL);
104 return 0;
105 }
106#endif
107 if (len == 7)
108 {
109 len += *ip++;
110#if CHECK_INPUT
111 if (ip >= in_end)
112 {
113 SET_ERRNO (EINVAL);
114 return 0;
115 }
116#endif
117 }
118
119 ref -= *ip++;
120
121 if (op + len + 2 > out_end)
122 {
123 SET_ERRNO (E2BIG);
124 return 0;
125 }
126
127 if (ref < (u8 *)out_data)
128 {
129 SET_ERRNO (EINVAL);
130 return 0;
131 }
132
133#ifdef lzf_movsb
134 len += 2;
135 lzf_movsb (op, ref, len);
136#else
137 *op++ = *ref++;
138 *op++ = *ref++;
139
140 do
141 *op++ = *ref++;
142 while (--len);
143#endif
144 }
145 }
146 while (ip < in_end);
147
148 return op - (u8 *)out_data;
149}
150