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