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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* |
| 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 | |||
| 8 | #include <linux/types.h> |
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| 9 | |||
| 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 | |||
| 14 | #define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)data, length) |
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| 15 | |||
| 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 | |||
| 27 | #endif /* _LINUX_CRC32_H */ |