| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * crc32.h |
| 3 | * See linux/lib/crc32.c for license and changes |
| 4 | */ |
| 5 | #ifndef _LINUX_CRC32_H |
| 6 | #define _LINUX_CRC32_H |
| 7 | |
| 8 | #include <linux/types.h> |
| 9 | |
| 10 | extern u32 crc32_le(u32 crc, unsigned char const *p, size_t len); |
| 11 | extern u32 crc32_be(u32 crc, unsigned char const *p, size_t len); |
| 12 | extern u32 bitreverse(u32 in); |
| 13 | |
| 14 | #define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)data, length) |
| 15 | |
| 16 | /* |
| 17 | * Helpers for hash table generation of ethernet nics: |
| 18 | * |
| 19 | * Ethernet sends the least significant bit of a byte first, thus crc32_le |
| 20 | * is used. The output of crc32_le is bit reversed [most significant bit |
| 21 | * is in bit nr 0], thus it must be reversed before use. Except for |
| 22 | * nics that bit swap the result internally... |
| 23 | */ |
| 24 | #define ether_crc(length, data) bitreverse(crc32_le(~0, data, length)) |
| 25 | #define ether_crc_le(length, data) crc32_le(~0, data, length) |
| 26 | |
| 27 | #endif /* _LINUX_CRC32_H */ |