crc32.h 904 B

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  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. #include <linux/types.h>
  8. /* #include <linux/bitrev.h> */
  9. extern u32 crc32_le(u32 crc, unsigned char const *p, size_t len);
  10. /* extern u32 crc32_be(u32 crc, unsigned char const *p, size_t len); */
  11. #define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)data, length)
  12. /*
  13. * Helpers for hash table generation of ethernet nics:
  14. *
  15. * Ethernet sends the least significant bit of a byte first, thus crc32_le
  16. * is used. The output of crc32_le is bit reversed [most significant bit
  17. * is in bit nr 0], thus it must be reversed before use. Except for
  18. * nics that bit swap the result internally...
  19. */
  20. /* #define ether_crc(length, data) bitrev32(crc32_le(~0, data, length)) */
  21. /* #define ether_crc_le(length, data) crc32_le(~0, data, length) */
  22. #endif /* _LINUX_CRC32_H */