Annotation of embedaddon/quagga/lib/jhash.h, revision 1.1.1.2
1.1 misho 1: /* jhash.h: Jenkins hash support.
2: *
3: * Copyright (C) 1996 Bob Jenkins (bob_jenkins@burtleburtle.net)
4: *
5: * http://burtleburtle.net/bob/hash/
6: *
7: * These are the credits from Bob's sources:
8: *
9: * lookup2.c, by Bob Jenkins, December 1996, Public Domain.
10: * hash(), hash2(), hash3, and mix() are externally useful functions.
11: * Routines to test the hash are included if SELF_TEST is defined.
12: * You can use this free for any purpose. It has no warranty.
13: *
14: * Copyright (C) 2003 David S. Miller (davem@redhat.com)
15: *
16: * I've modified Bob's hash to be useful in the Linux kernel, and
17: * any bugs present are surely my fault. -DaveM
18: */
19:
20: #ifndef _QUAGGA_JHASH_H
21: #define _QUAGGA_JHASH_H
22:
23: /* The most generic version, hashes an arbitrary sequence
24: * of bytes. No alignment or length assumptions are made about
25: * the input key.
26: */
1.1.1.2 ! misho 27: extern u_int32_t jhash(const void *key, u_int32_t length, u_int32_t initval);
1.1 misho 28:
29: /* A special optimized version that handles 1 or more of u_int32_ts.
30: * The length parameter here is the number of u_int32_ts in the key.
31: */
1.1.1.2 ! misho 32: extern u_int32_t jhash2(const u_int32_t *k, u_int32_t length, u_int32_t initval);
1.1 misho 33:
34: /* A special ultra-optimized versions that knows they are hashing exactly
35: * 3, 2 or 1 word(s).
36: *
37: * NOTE: In partilar the "c += length; __jhash_mix(a,b,c);" normally
38: * done at the end is not done here.
39: */
40: extern u_int32_t jhash_3words(u_int32_t a, u_int32_t b, u_int32_t c, u_int32_t initval);
41: extern u_int32_t jhash_2words(u_int32_t a, u_int32_t b, u_int32_t initval);
42: extern u_int32_t jhash_1word(u_int32_t a, u_int32_t initval);
43:
44: #endif /* _QUAGGA_JHASH_H */
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