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34 | * either the BSD or the GPL. |
34 | * either the BSD or the GPL. |
35 | */ |
35 | */ |
36 | |
36 | |
37 | #include "lzfP.h" |
37 | #include "lzfP.h" |
38 | |
38 | |
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39 | #include <string.h> /* for memcpy/memset */ |
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40 | |
39 | #if AVOID_ERRNO |
41 | #if AVOID_ERRNO |
40 | # define SET_ERRNO(n) |
42 | # define SET_ERRNO(n) |
41 | #else |
43 | #else |
42 | # include <errno.h> |
44 | # include <errno.h> |
43 | # define SET_ERRNO(n) errno = (n) |
45 | # define SET_ERRNO(n) errno = (n) |
44 | #endif |
46 | #endif |
45 | |
47 | |
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48 | #if USE_REP_MOVSB /* small win on amd, big loss on intel */ |
46 | #if (__i386 || __amd64) && __GNUC__ >= 3 |
49 | #if (__i386 || __amd64) && __GNUC__ >= 3 |
47 | # define lzf_movsb(dst, src, len) \ |
50 | # define lzf_movsb(dst, src, len) \ |
48 | asm ("rep movsb" \ |
51 | asm ("rep movsb" \ |
49 | : "=D" (dst), "=S" (src), "=c" (len) \ |
52 | : "=D" (dst), "=S" (src), "=c" (len) \ |
50 | : "0" (dst), "1" (src), "2" (len)); |
53 | : "0" (dst), "1" (src), "2" (len)); |
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54 | #endif |
51 | #endif |
55 | #endif |
52 | |
56 | |
53 | unsigned int |
57 | unsigned int |
54 | lzf_decompress (const void *const in_data, unsigned int in_len, |
58 | lzf_decompress (const void *const in_data, unsigned int in_len, |
55 | void *out_data, unsigned int out_len) |
59 | void *out_data, unsigned int out_len) |
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82 | #endif |
86 | #endif |
83 | |
87 | |
84 | #ifdef lzf_movsb |
88 | #ifdef lzf_movsb |
85 | lzf_movsb (op, ip, ctrl); |
89 | lzf_movsb (op, ip, ctrl); |
86 | #else |
90 | #else |
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91 | switch (ctrl) |
87 | do |
92 | { |
88 | *op++ = *ip++; |
93 | case 32: *op++ = *ip++; case 31: *op++ = *ip++; case 30: *op++ = *ip++; case 29: *op++ = *ip++; |
89 | while (--ctrl); |
94 | case 28: *op++ = *ip++; case 27: *op++ = *ip++; case 26: *op++ = *ip++; case 25: *op++ = *ip++; |
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95 | case 24: *op++ = *ip++; case 23: *op++ = *ip++; case 22: *op++ = *ip++; case 21: *op++ = *ip++; |
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96 | case 20: *op++ = *ip++; case 19: *op++ = *ip++; case 18: *op++ = *ip++; case 17: *op++ = *ip++; |
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97 | case 16: *op++ = *ip++; case 15: *op++ = *ip++; case 14: *op++ = *ip++; case 13: *op++ = *ip++; |
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98 | case 12: *op++ = *ip++; case 11: *op++ = *ip++; case 10: *op++ = *ip++; case 9: *op++ = *ip++; |
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99 | case 8: *op++ = *ip++; case 7: *op++ = *ip++; case 6: *op++ = *ip++; case 5: *op++ = *ip++; |
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100 | case 4: *op++ = *ip++; case 3: *op++ = *ip++; case 2: *op++ = *ip++; case 1: *op++ = *ip++; |
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101 | } |
90 | #endif |
102 | #endif |
91 | } |
103 | } |
92 | else /* back reference */ |
104 | else /* back reference */ |
93 | { |
105 | { |
94 | unsigned int len = ctrl >> 5; |
106 | unsigned int len = ctrl >> 5; |
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130 | |
142 | |
131 | #ifdef lzf_movsb |
143 | #ifdef lzf_movsb |
132 | len += 2; |
144 | len += 2; |
133 | lzf_movsb (op, ref, len); |
145 | lzf_movsb (op, ref, len); |
134 | #else |
146 | #else |
135 | *op++ = *ref++; |
147 | switch (len) |
136 | *op++ = *ref++; |
148 | { |
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149 | default: |
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150 | len += 2; |
137 | |
151 | |
138 | do |
152 | if (op >= ref + len) |
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153 | { |
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154 | /* disjunct areas */ |
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155 | memcpy (op, ref, len); |
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156 | op += len; |
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157 | } |
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158 | else |
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159 | { |
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160 | /* overlapping, use octte by octte copying */ |
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161 | do |
139 | *op++ = *ref++; |
162 | *op++ = *ref++; |
140 | while (--len); |
163 | while (--len); |
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164 | } |
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165 | |
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166 | break; |
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167 | |
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168 | case 9: *op++ = *ref++; |
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169 | case 8: *op++ = *ref++; |
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170 | case 7: *op++ = *ref++; |
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171 | case 6: *op++ = *ref++; |
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172 | case 5: *op++ = *ref++; |
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173 | case 4: *op++ = *ref++; |
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174 | case 3: *op++ = *ref++; |
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175 | case 2: *op++ = *ref++; |
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176 | case 1: *op++ = *ref++; |
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177 | case 0: *op++ = *ref++; /* two octets more */ |
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178 | *op++ = *ref++; |
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179 | } |
141 | #endif |
180 | #endif |
142 | } |
181 | } |
143 | } |
182 | } |
144 | while (ip < in_end); |
183 | while (ip < in_end); |
145 | |
184 | |