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/* jhash.h: Jenkins hash support.
*
* Copyright (C) 1996 Bob Jenkins (bob_jenkins@burtleburtle.net)
*
* http://burtleburtle.net/bob/hash/
*
* These are the credits from Bob's sources:
*
* lookup2.c, by Bob Jenkins, December 1996, Public Domain.
* hash(), hash2(), hash3, and mix() are externally useful functions.
* Routines to test the hash are included if SELF_TEST is defined.
* You can use this free for any purpose. It has no warranty.
*
* Copyright (C) 2003 David S. Miller (davem@redhat.com)
*
* I've modified Bob's hash to be useful in the Linux kernel, and
* any bugs present are surely my fault. -DaveM
*/
#ifndef _QUAGGA_JHASH_H
#define _QUAGGA_JHASH_H
#ifdef __cplusplus
extern "C" {
#endif
/* The most generic version, hashes an arbitrary sequence
* of bytes. No alignment or length assumptions are made about
* the input key.
*/
extern uint32_t jhash(const void *key, uint32_t length, uint32_t initval);
/* A special optimized version that handles 1 or more of uint32_ts.
* The length parameter here is the number of uint32_ts in the key.
*/
extern uint32_t jhash2(const uint32_t *k, uint32_t length, uint32_t initval);
/* A special ultra-optimized versions that knows they are hashing exactly
* 3, 2 or 1 word(s).
*
* NOTE: In partilar the "c += length; __jhash_mix(a,b,c);" normally
* done at the end is not done here.
*/
extern uint32_t jhash_3words(uint32_t a, uint32_t b, uint32_t c,
uint32_t initval);
extern uint32_t jhash_2words(uint32_t a, uint32_t b, uint32_t initval);
extern uint32_t jhash_1word(uint32_t a, uint32_t initval);
#ifdef __cplusplus
}
#endif
#endif /* _QUAGGA_JHASH_H */
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