========================================================================= */
(crc, buf, len)
| 304 | |
| 305 | /* ========================================================================= */ |
| 306 | local unsigned long crc32_big(crc, buf, len) |
| 307 | unsigned long crc; |
| 308 | const unsigned char FAR *buf; |
| 309 | z_size_t len; |
| 310 | { |
| 311 | register z_crc_t c; |
| 312 | register const z_crc_t FAR *buf4; |
| 313 | |
| 314 | c = ZSWAP32((z_crc_t)crc); |
| 315 | c = ~c; |
| 316 | while (len && ((ptrdiff_t)buf & 3)) { |
| 317 | c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8); |
| 318 | len--; |
| 319 | } |
| 320 | |
| 321 | buf4 = (const z_crc_t FAR *)(const void FAR *)buf; |
| 322 | while (len >= 32) { |
| 323 | DOBIG32; |
| 324 | len -= 32; |
| 325 | } |
| 326 | while (len >= 4) { |
| 327 | DOBIG4; |
| 328 | len -= 4; |
| 329 | } |
| 330 | buf = (const unsigned char FAR *)buf4; |
| 331 | |
| 332 | if (len) do { |
| 333 | c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8); |
| 334 | } while (--len); |
| 335 | c = ~c; |
| 336 | return (unsigned long)(ZSWAP32(c)); |
| 337 | } |
| 338 | |
| 339 | #endif /* BYFOUR */ |
| 340 |