1 | /* |
1 | /* |
2 | * Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de> |
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, |
8 | * this list of conditions and the following disclaimer. |
8 | * this list of conditions and the following disclaimer. |
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 | * 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 |
15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
16 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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- |
17 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
18 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
18 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
… | |
… | |
41 | #else |
41 | #else |
42 | # include <errno.h> |
42 | # include <errno.h> |
43 | # define SET_ERRNO(n) errno = (n) |
43 | # define SET_ERRNO(n) errno = (n) |
44 | #endif |
44 | #endif |
45 | |
45 | |
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46 | #if USE_REP_MOVSB /* small win on amd, big loss on intel */ |
46 | #if (__i386 || __amd64) && __GNUC__ >= 3 |
47 | #if (__i386 || __amd64) && __GNUC__ >= 3 |
47 | # define lzf_movsb(dst, src, len) \ |
48 | # define lzf_movsb(dst, src, len) \ |
48 | asm ("rep movsb" \ |
49 | asm ("rep movsb" \ |
49 | : "=D" (dst), "=S" (src), "=c" (len) \ |
50 | : "=D" (dst), "=S" (src), "=c" (len) \ |
50 | : "0" (dst), "1" (src), "2" (len)); |
51 | : "0" (dst), "1" (src), "2" (len)); |
51 | #endif |
52 | #endif |
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53 | #endif |
52 | |
54 | |
53 | unsigned int |
55 | unsigned int |
54 | lzf_decompress (const void *const in_data, unsigned int in_len, |
56 | lzf_decompress (const void *const in_data, unsigned int in_len, |
55 | void *out_data, unsigned int out_len) |
57 | void *out_data, unsigned int out_len) |
56 | { |
58 | { |
57 | u8 const *ip = (const u8 *)in_data; |
59 | u8 const *ip = (const u8 *)in_data; |
58 | u8 *op = (u8 *)out_data; |
60 | u8 *op = (u8 *)out_data; |
… | |
… | |
81 | } |
83 | } |
82 | #endif |
84 | #endif |
83 | |
85 | |
84 | #ifdef lzf_movsb |
86 | #ifdef lzf_movsb |
85 | lzf_movsb (op, ip, ctrl); |
87 | lzf_movsb (op, ip, ctrl); |
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|
88 | #elif OPTIMISE_SIZE |
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|
89 | while (ctrl--) |
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90 | *op++ = *ip++; |
86 | #else |
91 | #else |
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92 | switch (ctrl) |
87 | do |
93 | { |
88 | *op++ = *ip++; |
94 | case 32: *op++ = *ip++; case 31: *op++ = *ip++; case 30: *op++ = *ip++; case 29: *op++ = *ip++; |
89 | while (--ctrl); |
95 | case 28: *op++ = *ip++; case 27: *op++ = *ip++; case 26: *op++ = *ip++; case 25: *op++ = *ip++; |
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96 | case 24: *op++ = *ip++; case 23: *op++ = *ip++; case 22: *op++ = *ip++; case 21: *op++ = *ip++; |
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97 | case 20: *op++ = *ip++; case 19: *op++ = *ip++; case 18: *op++ = *ip++; case 17: *op++ = *ip++; |
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98 | case 16: *op++ = *ip++; case 15: *op++ = *ip++; case 14: *op++ = *ip++; case 13: *op++ = *ip++; |
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99 | case 12: *op++ = *ip++; case 11: *op++ = *ip++; case 10: *op++ = *ip++; case 9: *op++ = *ip++; |
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100 | case 8: *op++ = *ip++; case 7: *op++ = *ip++; case 6: *op++ = *ip++; case 5: *op++ = *ip++; |
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101 | case 4: *op++ = *ip++; case 3: *op++ = *ip++; case 2: *op++ = *ip++; case 1: *op++ = *ip++; |
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102 | } |
90 | #endif |
103 | #endif |
91 | } |
104 | } |
92 | else /* back reference */ |
105 | else /* back reference */ |
93 | { |
106 | { |
94 | unsigned int len = ctrl >> 5; |
107 | unsigned int len = ctrl >> 5; |
… | |
… | |
129 | } |
142 | } |
130 | |
143 | |
131 | #ifdef lzf_movsb |
144 | #ifdef lzf_movsb |
132 | len += 2; |
145 | len += 2; |
133 | lzf_movsb (op, ref, len); |
146 | lzf_movsb (op, ref, len); |
134 | #else |
147 | #elif OPTIMISE_SIZE |
135 | *op++ = *ref++; |
148 | len += 2; |
136 | *op++ = *ref++; |
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137 | |
149 | |
138 | do |
150 | do |
139 | *op++ = *ref++; |
151 | *op++ = *ref++; |
140 | while (--len); |
152 | while (--len); |
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153 | #else |
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154 | switch (len) |
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155 | { |
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156 | default: |
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157 | len += 2; |
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158 | |
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159 | if (op >= ref + len) |
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160 | { |
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161 | /* disjunct areas */ |
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162 | memcpy (op, ref, len); |
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163 | op += len; |
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164 | } |
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165 | else |
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166 | { |
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167 | /* overlapping, use octet by octet copying */ |
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168 | do |
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169 | *op++ = *ref++; |
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170 | while (--len); |
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171 | } |
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172 | |
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173 | break; |
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174 | |
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175 | case 9: *op++ = *ref++; |
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176 | case 8: *op++ = *ref++; |
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177 | case 7: *op++ = *ref++; |
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178 | case 6: *op++ = *ref++; |
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179 | case 5: *op++ = *ref++; |
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180 | case 4: *op++ = *ref++; |
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181 | case 3: *op++ = *ref++; |
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182 | case 2: *op++ = *ref++; |
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183 | case 1: *op++ = *ref++; |
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184 | case 0: *op++ = *ref++; /* two octets more */ |
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185 | *op++ = *ref++; |
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186 | } |
141 | #endif |
187 | #endif |
142 | } |
188 | } |
143 | } |
189 | } |
144 | while (ip < in_end); |
190 | while (ip < in_end); |
145 | |
191 | |