========================================================================= */
| 277 | |
| 278 | /* ========================================================================= */ |
| 279 | local unsigned long crc32_big(unsigned long crc, const unsigned char FAR *buf, unsigned len) |
| 280 | { |
| 281 | register z_crc_t c; |
| 282 | register const z_crc_t FAR *buf4; |
| 283 | |
| 284 | c = ZSWAP32((z_crc_t)crc); |
| 285 | c = ~c; |
| 286 | while (len && ((ptrdiff_t)buf & 3)) { |
| 287 | c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8); |
| 288 | len--; |
| 289 | } |
| 290 | |
| 291 | buf4 = (const z_crc_t FAR *)(const void FAR *)buf; |
| 292 | while (len >= 32) { |
| 293 | DOBIG32; |
| 294 | len -= 32; |
| 295 | } |
| 296 | while (len >= 4) { |
| 297 | DOBIG4; |
| 298 | len -= 4; |
| 299 | } |
| 300 | buf = (const unsigned char FAR *)buf4; |
| 301 | |
| 302 | if (len) do { |
| 303 | c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8); |
| 304 | } while (--len); |
| 305 | c = ~c; |
| 306 | return (unsigned long)(ZSWAP32(c)); |
| 307 | } |
| 308 | |
| 309 | #endif /* BYFOUR */ |
| 310 |