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 */