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, |
… | |
… | |
21 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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 |
22 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
23 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
23 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
24 | * |
24 | * |
25 | * Alternatively, the contents of this file may be used under the terms of |
25 | * Alternatively, the contents of this file may be used under the terms of |
26 | * the GNU General Public License version 2 (the "GPL"), in which case the |
26 | * the GNU General Public License ("GPL") version 2 or any later version, |
27 | * provisions of the GPL are applicable instead of the above. If you wish to |
27 | * in which case the provisions of the GPL are applicable instead of |
28 | * allow the use of your version of this file only under the terms of the |
28 | * the above. If you wish to allow the use of your version of this file |
29 | * GPL and not to allow others to use your version of this file under the |
29 | * only under the terms of the GPL and not to allow others to use your |
30 | * BSD license, indicate your decision by deleting the provisions above and |
30 | * version of this file under the BSD license, indicate your decision |
31 | * replace them with the notice and other provisions required by the GPL. If |
31 | * by deleting the provisions above and replace them with the notice |
32 | * you do not delete the provisions above, a recipient may use your version |
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 |
33 | * of this file under either the BSD or the GPL. |
34 | * either the BSD or the GPL. |
34 | */ |
35 | */ |
35 | |
36 | |
36 | #include "lzfP.h" |
37 | #include "lzfP.h" |
37 | |
38 | |
38 | #if AVOID_ERRNO |
39 | #if AVOID_ERRNO |
… | |
… | |
40 | #else |
41 | #else |
41 | # include <errno.h> |
42 | # include <errno.h> |
42 | # define SET_ERRNO(n) errno = (n) |
43 | # define SET_ERRNO(n) errno = (n) |
43 | #endif |
44 | #endif |
44 | |
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 */ |
45 | #if (__i386 || __amd64) && __GNUC__ >= 3 |
48 | #if (__i386 || __amd64) && __GNUC__ >= 3 |
46 | # define lzf_movsb(dst, src, len) \ |
49 | # define lzf_movsb(dst, src, len) \ |
47 | asm ("rep movsb" \ |
50 | asm ("rep movsb" \ |
48 | : "=D" (dst), "=S" (src), "=c" (len) \ |
51 | : "=D" (dst), "=S" (src), "=c" (len) \ |
49 | : "0" (dst), "1" (src), "2" (len)); |
52 | : "0" (dst), "1" (src), "2" (len)); |
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53 | #endif |
50 | #endif |
54 | #endif |
51 | |
55 | |
52 | unsigned int |
56 | unsigned int |
53 | lzf_decompress (const void *const in_data, unsigned int in_len, |
57 | lzf_decompress (const void *const in_data, unsigned int in_len, |
54 | void *out_data, unsigned int out_len) |
58 | void *out_data, unsigned int out_len) |
… | |
… | |
81 | #endif |
85 | #endif |
82 | |
86 | |
83 | #ifdef lzf_movsb |
87 | #ifdef lzf_movsb |
84 | lzf_movsb (op, ip, ctrl); |
88 | lzf_movsb (op, ip, ctrl); |
85 | #else |
89 | #else |
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90 | switch (ctrl) |
86 | do |
91 | { |
87 | *op++ = *ip++; |
92 | case 32: *op++ = *ip++; case 31: *op++ = *ip++; case 30: *op++ = *ip++; case 29: *op++ = *ip++; |
88 | 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 | } |
89 | #endif |
101 | #endif |
90 | } |
102 | } |
91 | else /* back reference */ |
103 | else /* back reference */ |
92 | { |
104 | { |
93 | unsigned int len = ctrl >> 5; |
105 | unsigned int len = ctrl >> 5; |
… | |
… | |
129 | |
141 | |
130 | #ifdef lzf_movsb |
142 | #ifdef lzf_movsb |
131 | len += 2; |
143 | len += 2; |
132 | lzf_movsb (op, ref, len); |
144 | lzf_movsb (op, ref, len); |
133 | #else |
145 | #else |
134 | *op++ = *ref++; |
146 | switch (len) |
135 | *op++ = *ref++; |
147 | { |
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148 | default: |
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149 | len += 2; |
136 | |
150 | |
137 | 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 |
138 | *op++ = *ref++; |
161 | *op++ = *ref++; |
139 | 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 | } |
140 | #endif |
179 | #endif |
141 | } |
180 | } |
142 | } |
181 | } |
143 | while (ip < in_end); |
182 | while (ip < in_end); |
144 | |
183 | |