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 /* #include <linux/bitrev.h> */ 10 11 extern u32 crc32_le(u32 crc, unsigned char const *p, size_t len); 12 /* extern u32 crc32_be(u32 crc, unsigned char const *p, size_t len); */ 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) bitrev32(crc32_le(~0, data, length)) */ 25 /* #define ether_crc_le(length, data) crc32_le(~0, data, length) */ 26 27 #endif /* _LINUX_CRC32_H */ 28