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26 lines
738 B
C
26 lines
738 B
C
#ifndef _HAVE_JENHASH_H
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#define _HAVE_JENHASH_H
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/* Bob Jenkins 32bit hash function */
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/* via: http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx */
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#define jen_mix(a,b,c) \
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{ \
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a -= b; a -= c; a ^= ( c >> 13 ); \
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b -= c; b -= a; b ^= ( a << 8 ); \
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c -= a; c -= b; c ^= ( b >> 13 ); \
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a -= b; a -= c; a ^= ( c >> 12 ); \
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b -= c; b -= a; b ^= ( a << 16 ); \
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c -= a; c -= b; c ^= ( b >> 5 ); \
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a -= b; a -= c; a ^= ( c >> 3 ); \
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b -= c; b -= a; b ^= ( a << 10 ); \
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c -= a; c -= b; c ^= ( b >> 15 ); \
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}
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#define JEN_PSALT 0xD9A03
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#define JEN_SSALT 0xC503B
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unsigned jen_hash ( unsigned char *k, unsigned length, unsigned initval );
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#endif /* _HAVE_JENHASH_H */
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