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 */
28