e7d939bda2
This includes: o All directories named *ia64* o All files named *ia64* o All ia64-specific code guarded by __ia64__ o All ia64-specific makefile logic o Mention of ia64 in comments and documentation This excludes: o Everything under contrib/ o Everything under crypto/ o sys/xen/interface o sys/sys/elf_common.h Discussed at: BSDcan
72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
/*-
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* Fowler / Noll / Vo Hash (FNV Hash)
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* http://www.isthe.com/chongo/tech/comp/fnv/
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*
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* This is an implementation of the algorithms posted above.
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* This file is placed in the public domain by Peter Wemm.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_FNV_HASH_H_
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#define _SYS_FNV_HASH_H_
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typedef u_int32_t Fnv32_t;
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typedef u_int64_t Fnv64_t;
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#define FNV1_32_INIT ((Fnv32_t) 33554467UL)
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#define FNV1_64_INIT ((Fnv64_t) 0xcbf29ce484222325ULL)
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#define FNV_32_PRIME ((Fnv32_t) 0x01000193UL)
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#define FNV_64_PRIME ((Fnv64_t) 0x100000001b3ULL)
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static __inline Fnv32_t
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fnv_32_buf(const void *buf, size_t len, Fnv32_t hval)
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{
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const u_int8_t *s = (const u_int8_t *)buf;
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while (len-- != 0) {
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hval *= FNV_32_PRIME;
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hval ^= *s++;
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}
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return hval;
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}
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static __inline Fnv32_t
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fnv_32_str(const char *str, Fnv32_t hval)
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{
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const u_int8_t *s = (const u_int8_t *)str;
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Fnv32_t c;
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while ((c = *s++) != 0) {
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hval *= FNV_32_PRIME;
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hval ^= c;
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}
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return hval;
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}
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static __inline Fnv64_t
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fnv_64_buf(const void *buf, size_t len, Fnv64_t hval)
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{
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const u_int8_t *s = (const u_int8_t *)buf;
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while (len-- != 0) {
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hval *= FNV_64_PRIME;
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hval ^= *s++;
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}
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return hval;
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}
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static __inline Fnv64_t
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fnv_64_str(const char *str, Fnv64_t hval)
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{
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const u_int8_t *s = (const u_int8_t *)str;
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u_register_t c; /* 32 bit on i386, 64 bit on alpha */
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while ((c = *s++) != 0) {
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hval *= FNV_64_PRIME;
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hval ^= c;
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}
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return hval;
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}
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#endif /* _SYS_FNV_HASH_H_ */
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