| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de> |
2 | * Copyright (c) 2000-2008 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, |
| … | |
… | |
| 168 | /* match found at *ref++ */ |
168 | /* match found at *ref++ */ |
| 169 | unsigned int len = 2; |
169 | unsigned int len = 2; |
| 170 | unsigned int maxlen = in_end - ip - len; |
170 | unsigned int maxlen = in_end - ip - len; |
| 171 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
171 | maxlen = maxlen > MAX_REF ? MAX_REF : maxlen; |
| 172 | |
172 | |
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173 | if (expect_false (op + 3 + 1 >= out_end)) /* first a faster conservative test */ |
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174 | if (op - !lit + 3 + 1 >= out_end) /* second the exact but rare test */ |
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175 | return 0; |
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176 | |
| 173 | op [- lit - 1] = lit - 1; /* stop run */ |
177 | op [- lit - 1] = lit - 1; /* stop run */ |
| 174 | op -= !lit; /* undo run if length is zero */ |
178 | op -= !lit; /* undo run if length is zero */ |
| 175 | |
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| 176 | if (expect_false (op + 3 + 1 >= out_end)) |
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| 177 | return 0; |
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| 178 | |
179 | |
| 179 | for (;;) |
180 | for (;;) |
| 180 | { |
181 | { |
| 181 | if (expect_true (maxlen > 16)) |
182 | if (expect_true (maxlen > 16)) |
| 182 | { |
183 | { |
| … | |
… | |
| 206 | while (len < maxlen && ref[len] == ip[len]); |
207 | while (len < maxlen && ref[len] == ip[len]); |
| 207 | |
208 | |
| 208 | break; |
209 | break; |
| 209 | } |
210 | } |
| 210 | |
211 | |
| 211 | len -= 2; |
212 | len -= 2; /* len is now #octets - 1 */ |
| 212 | ip++; |
213 | ip++; |
| 213 | |
214 | |
| 214 | if (len < 7) |
215 | if (len < 7) |
| 215 | { |
216 | { |
| 216 | *op++ = (off >> 8) + (len << 5); |
217 | *op++ = (off >> 8) + (len << 5); |
| … | |
… | |
| 220 | *op++ = (off >> 8) + ( 7 << 5); |
221 | *op++ = (off >> 8) + ( 7 << 5); |
| 221 | *op++ = len - 7; |
222 | *op++ = len - 7; |
| 222 | } |
223 | } |
| 223 | |
224 | |
| 224 | *op++ = off; |
225 | *op++ = off; |
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226 | lit = 0; op++; /* start run */ |
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227 | |
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228 | ip += len + 1; |
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229 | |
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230 | if (expect_false (ip >= in_end - 2)) |
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231 | break; |
| 225 | |
232 | |
| 226 | #if ULTRA_FAST || VERY_FAST |
233 | #if ULTRA_FAST || VERY_FAST |
| 227 | ip += len; |
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| 228 | #if VERY_FAST && !ULTRA_FAST |
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| 229 | --ip; |
234 | --ip; |
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235 | # if VERY_FAST && !ULTRA_FAST |
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236 | --ip; |
| 230 | #endif |
237 | # endif |
| 231 | hval = FRST (ip); |
238 | hval = FRST (ip); |
| 232 | |
239 | |
| 233 | hval = NEXT (hval, ip); |
240 | hval = NEXT (hval, ip); |
| 234 | htab[IDX (hval)] = ip; |
241 | htab[IDX (hval)] = ip; |
| 235 | ip++; |
242 | ip++; |
| 236 | |
243 | |
| 237 | #if VERY_FAST && !ULTRA_FAST |
244 | # if VERY_FAST && !ULTRA_FAST |
| 238 | hval = NEXT (hval, ip); |
245 | hval = NEXT (hval, ip); |
| 239 | htab[IDX (hval)] = ip; |
246 | htab[IDX (hval)] = ip; |
| 240 | ip++; |
247 | ip++; |
| 241 | #endif |
248 | # endif |
| 242 | #else |
249 | #else |
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250 | ip -= len + 1; |
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251 | |
| 243 | do |
252 | do |
| 244 | { |
253 | { |
| 245 | hval = NEXT (hval, ip); |
254 | hval = NEXT (hval, ip); |
| 246 | htab[IDX (hval)] = ip; |
255 | htab[IDX (hval)] = ip; |
| 247 | ip++; |
256 | ip++; |
| 248 | } |
257 | } |
| 249 | while (len--); |
258 | while (len--); |
| 250 | #endif |
259 | #endif |
| 251 | |
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| 252 | lit = 0; op++; /* start run */ |
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| 253 | } |
260 | } |
| 254 | else |
261 | else |
| 255 | { |
262 | { |
| 256 | /* one more literal byte we must copy */ |
263 | /* one more literal byte we must copy */ |
| 257 | if (expect_false (op >= out_end)) |
264 | if (expect_false (op >= out_end)) |
