2 * Fowler / Noll / Vo Hash (FNV Hash)
3 * http://www.isthe.com/chongo/tech/comp/fnv/
5 * This is an implementation of the algorithms posted above.
6 * This file is placed in the public domain by Peter Wemm.
8 * $FreeBSD: src/sys/sys/fnv_hash.h,v 1.2.2.1 2001/03/21 10:50:59 peter Exp $
9 * $DragonFly: src/sys/sys/fnv_hash.h,v 1.3 2006/05/20 02:42:13 dillon Exp $
12 #ifndef _SYS_FNV_HASH_H_
13 #define _SYS_FNV_HASH_H_
16 #include <sys/types.h>
19 typedef u_int32_t Fnv32_t;
20 typedef u_int64_t Fnv64_t;
22 #define FNV1_32_INIT ((Fnv32_t) 33554467UL)
23 #define FNV1_64_INIT ((Fnv64_t) 0xcbf29ce484222325ULL)
25 #define FNV_32_PRIME ((Fnv32_t) 0x01000193UL)
26 #define FNV_64_PRIME ((Fnv64_t) 0x100000001b3ULL)
28 static __inline Fnv32_t
29 fnv_32_buf(const void *buf, size_t len, Fnv32_t hval)
31 const u_int8_t *s = (const u_int8_t *)buf;
40 static __inline Fnv32_t
41 fnv_32_str(const char *str, Fnv32_t hval)
43 const u_int8_t *s = (const u_int8_t *)str;
46 while ((c = *s++) != 0) {
53 static __inline Fnv64_t
54 fnv_64_buf(const void *buf, size_t len, Fnv64_t hval)
56 const u_int8_t *s = (const u_int8_t *)buf;
65 static __inline Fnv64_t
66 fnv_64_str(const char *str, Fnv64_t hval)
68 const u_int8_t *s = (const u_int8_t *)str;
69 u_register_t c; /* 32 bit on i386, 64 bit on alpha,ia64 */
71 while ((c = *s++) != 0) {