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Last change
on this file since 52 was
2,
checked in by jglee, 11 years ago
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first commit
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Property svn:executable set to
*
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File size:
900 bytes
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| 1 | /* |
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| 2 | * crc32.h |
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| 3 | * See linux/lib/crc32.c for license and changes |
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| 4 | */ |
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| 5 | #ifndef _LINUX_CRC32_H |
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| 6 | #define _LINUX_CRC32_H |
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| 7 | |
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| 8 | #include <linux/types.h> |
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| 9 | |
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| 10 | extern __u32 crc32_le(__u32 crc, unsigned char const *p, size_t len); |
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| 11 | extern __u32 crc32_be(__u32 crc, unsigned char const *p, size_t len); |
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| 12 | extern __u32 bitreverse(__u32 in); |
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| 13 | |
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| 14 | #define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)data, length) |
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| 15 | |
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| 16 | /* |
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| 17 | * Helpers for hash table generation of ethernet nics: |
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| 18 | * |
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| 19 | * Ethernet sends the least significant bit of a byte first, thus crc32_le |
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| 20 | * is used. The output of crc32_le is bit reversed [most significant bit |
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| 21 | * is in bit nr 0], thus it must be reversed before use. Except for |
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| 22 | * nics that bit swap the result internally... |
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| 23 | */ |
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| 24 | #define ether_crc(length, data) bitreverse(crc32_le(~0, data, length)) |
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| 25 | #define ether_crc_le(length, data) crc32_le(~0, data, length) |
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| 26 | |
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| 27 | #endif /* _LINUX_CRC32_H */ |
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