1 | /* |
1 | /* |
2 | * Copyright (c) 2000 Marc Alexander Lehmann <pcg@goof.com> |
2 | * Copyright (c) 2000-2010 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 | #define USE_REP_MOVSB 1 |
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47 | #if USE_REP_MOVSB /* small win on amd, big loss on intel */ |
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48 | #if (__i386 || __amd64) && __GNUC__ >= 3 |
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49 | # define lzf_movsb(dst, src, len) \ |
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50 | asm ("rep movsb" \ |
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51 | : "=D" (dst), "=S" (src), "=c" (len) \ |
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52 | : "0" (dst), "1" (src), "2" (len)); |
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53 | #endif |
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54 | #endif |
32 | |
55 | |
33 | unsigned int |
56 | unsigned int |
34 | lzf_decompress (const void *const in_data, unsigned int in_len, |
57 | lzf_decompress (const void *const in_data, unsigned int in_len, |
35 | void *out_data, unsigned int out_len) |
58 | void *out_data, unsigned int out_len) |
36 | { |
59 | { |
37 | u8 const *ip = in_data; |
60 | u8 const *ip = (const u8 *)in_data; |
38 | u8 *op = out_data; |
61 | u8 *op = (u8 *)out_data; |
39 | u8 const *const in_end = ip + in_len; |
62 | u8 const *const in_end = ip + in_len; |
40 | u8 *const out_end = op + out_len; |
63 | u8 *const out_end = op + out_len; |
41 | |
64 | |
42 | do |
65 | do |
43 | { |
66 | { |
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47 | { |
70 | { |
48 | ctrl++; |
71 | ctrl++; |
49 | |
72 | |
50 | if (op + ctrl > out_end) |
73 | if (op + ctrl > out_end) |
51 | { |
74 | { |
52 | errno = E2BIG; |
75 | SET_ERRNO (E2BIG); |
53 | return 0; |
76 | return 0; |
54 | } |
77 | } |
55 | |
78 | |
56 | #if USE_MEMCPY |
79 | #if CHECK_INPUT |
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80 | if (ip + ctrl > in_end) |
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81 | { |
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82 | SET_ERRNO (EINVAL); |
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83 | return 0; |
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84 | } |
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85 | #endif |
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86 | |
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87 | #ifdef lzf_movsb |
57 | memcpy (op, ip, ctrl); |
88 | lzf_movsb (op, ip, ctrl); |
58 | op += ctrl; |
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59 | ip += ctrl; |
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60 | #else |
89 | #else |
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90 | switch (ctrl) |
61 | do |
91 | { |
62 | *op++ = *ip++; |
92 | case 32: *op++ = *ip++; case 31: *op++ = *ip++; case 30: *op++ = *ip++; case 29: *op++ = *ip++; |
63 | while (--ctrl); |
93 | case 28: *op++ = *ip++; case 27: *op++ = *ip++; case 26: *op++ = *ip++; case 25: *op++ = *ip++; |
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94 | case 24: *op++ = *ip++; case 23: *op++ = *ip++; case 22: *op++ = *ip++; case 21: *op++ = *ip++; |
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95 | case 20: *op++ = *ip++; case 19: *op++ = *ip++; case 18: *op++ = *ip++; case 17: *op++ = *ip++; |
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96 | case 16: *op++ = *ip++; case 15: *op++ = *ip++; case 14: *op++ = *ip++; case 13: *op++ = *ip++; |
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97 | case 12: *op++ = *ip++; case 11: *op++ = *ip++; case 10: *op++ = *ip++; case 9: *op++ = *ip++; |
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98 | case 8: *op++ = *ip++; case 7: *op++ = *ip++; case 6: *op++ = *ip++; case 5: *op++ = *ip++; |
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99 | case 4: *op++ = *ip++; case 3: *op++ = *ip++; case 2: *op++ = *ip++; case 1: *op++ = *ip++; |
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100 | } |
64 | #endif |
101 | #endif |
65 | } |
102 | } |
66 | else /* back reference */ |
103 | else /* back reference */ |
67 | { |
104 | { |
68 | unsigned int len = ctrl >> 5; |
105 | unsigned int len = ctrl >> 5; |
69 | |
106 | |
70 | u8 *ref = op - ((ctrl & 0x1f) << 8) - 1; |
107 | u8 *ref = op - ((ctrl & 0x1f) << 8) - 1; |
71 | |
108 | |
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109 | #if CHECK_INPUT |
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110 | if (ip >= in_end) |
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111 | { |
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112 | SET_ERRNO (EINVAL); |
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113 | return 0; |
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114 | } |
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115 | #endif |
72 | if (len == 7) |
116 | if (len == 7) |
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117 | { |
73 | len += *ip++; |
118 | len += *ip++; |
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119 | #if CHECK_INPUT |
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120 | if (ip >= in_end) |
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121 | { |
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122 | SET_ERRNO (EINVAL); |
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123 | return 0; |
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124 | } |
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125 | #endif |
74 | |
126 | } |
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127 | |
75 | ref -= *ip++; |
128 | ref -= *ip++; |
76 | |
129 | |
77 | if (op + len + 2 > out_end) |
130 | if (op + len + 2 > out_end) |
78 | { |
131 | { |
79 | errno = E2BIG; |
132 | SET_ERRNO (E2BIG); |
80 | return 0; |
133 | return 0; |
81 | } |
134 | } |
82 | |
135 | |
83 | if (ref < (u8 *)out_data) |
136 | if (ref < (u8 *)out_data) |
84 | { |
137 | { |
85 | errno = EINVAL; |
138 | SET_ERRNO (EINVAL); |
86 | return 0; |
139 | return 0; |
87 | } |
140 | } |
88 | |
141 | |
89 | *op++ = *ref++; |
142 | #ifdef lzf_movsb |
90 | *op++ = *ref++; |
143 | len += 2; |
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144 | lzf_movsb (op, ref, len); |
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145 | #else |
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146 | switch (len) |
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147 | { |
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148 | default: |
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149 | len += 2; |
91 | |
150 | |
92 | do |
151 | if (op >= ref + len) |
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152 | { |
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153 | /* disjunct areas */ |
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154 | memcpy (op, ref, len); |
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155 | op += len; |
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156 | } |
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157 | else |
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158 | { |
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159 | /* overlapping, use octte by octte copying */ |
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160 | do |
93 | *op++ = *ref++; |
161 | *op++ = *ref++; |
94 | while (--len); |
162 | while (--len); |
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163 | } |
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164 | |
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165 | break; |
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166 | |
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167 | case 9: *op++ = *ref++; |
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168 | case 8: *op++ = *ref++; |
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169 | case 7: *op++ = *ref++; |
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170 | case 6: *op++ = *ref++; |
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171 | case 5: *op++ = *ref++; |
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172 | case 4: *op++ = *ref++; |
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173 | case 3: *op++ = *ref++; |
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174 | case 2: *op++ = *ref++; |
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175 | case 1: *op++ = *ref++; |
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176 | case 0: *op++ = *ref++; /* two octets more */ |
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177 | *op++ = *ref++; |
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178 | } |
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179 | #endif |
95 | } |
180 | } |
96 | } |
181 | } |
97 | while (op < out_end && ip < in_end); |
182 | while (ip < in_end); |
98 | |
183 | |
99 | return op - (u8 *)out_data; |
184 | return op - (u8 *)out_data; |
100 | } |
185 | } |
101 | |
186 | |