========================================================================= */
(crc, buf, len)
| 300 | |
| 301 | /* ========================================================================= */ |
| 302 | local unsigned long crc32_big(crc, buf, len) |
| 303 | unsigned long crc; |
| 304 | const unsigned char FAR *buf; |
| 305 | unsigned len; |
| 306 | { |
| 307 | register u4 c; |
| 308 | register const u4 FAR *buf4; |
| 309 | |
| 310 | c = REV((u4)crc); |
| 311 | c = ~c; |
| 312 | while (len && ((ptrdiff_t)buf & 3)) { |
| 313 | c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8); |
| 314 | len--; |
| 315 | } |
| 316 | |
| 317 | buf4 = (const u4 FAR *)(const void FAR *)buf; |
| 318 | buf4--; |
| 319 | while (len >= 32) { |
| 320 | DOBIG32; |
| 321 | len -= 32; |
| 322 | } |
| 323 | while (len >= 4) { |
| 324 | DOBIG4; |
| 325 | len -= 4; |
| 326 | } |
| 327 | buf4++; |
| 328 | buf = (const unsigned char FAR *)buf4; |
| 329 | |
| 330 | if (len) do { |
| 331 | c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8); |
| 332 | } while (--len); |
| 333 | c = ~c; |
| 334 | return (unsigned long)(REV(c)); |
| 335 | } |
| 336 | |
| 337 | #endif /* BYFOUR */ |
| 338 |