mirror of
https://github.com/cryb-to/cryb-to.git
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114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/*-
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* Copyright (c) 2022 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "cryb/impl.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <cryb/hash.h>
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#include "cryb_fnv_impl.h"
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/*
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* Implementations of the 32- and 64-bit Fowler-Noll-Vo (FNV) 0, 1, and 1a hashes.
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*/
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uint32_t fnv0_32_hash(const void *data, size_t len)
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{
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const uint8_t *p;
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uint32_t h;
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for (p = data, h = 0; len > 0; ++p, --len) {
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h *= FNV_32_PRIME;
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h ^= *p;
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}
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return (h);
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}
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uint64_t fnv0_64_hash(const void *data, size_t len)
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{
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const uint8_t *p;
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uint64_t h;
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for (p = data, h = 0; len > 0; ++p, --len) {
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h *= FNV_64_PRIME;
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h ^= *p;
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}
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return (h);
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}
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uint32_t fnv1_32_hash(const void *data, size_t len)
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{
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const uint8_t *p;
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uint32_t h;
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for (p = data, h = FNV_32_OFFSET_BASIS; len > 0; ++p, --len) {
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h *= FNV_32_PRIME;
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h ^= *p;
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}
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return (h);
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}
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uint64_t fnv1_64_hash(const void *data, size_t len)
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{
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const uint8_t *p;
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uint64_t h;
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for (p = data, h = FNV_64_OFFSET_BASIS; len > 0; ++p, --len) {
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h *= FNV_64_PRIME;
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h ^= *p;
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}
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return (h);
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}
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uint32_t fnv1a_32_hash(const void *data, size_t len)
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{
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const uint8_t *p;
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uint32_t h;
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for (p = data, h = FNV_32_OFFSET_BASIS; len > 0; ++p, --len) {
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h ^= *p;
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h *= FNV_32_PRIME;
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}
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return (h);
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}
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uint64_t fnv1a_64_hash(const void *data, size_t len)
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{
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const uint8_t *p;
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uint64_t h;
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for (p = data, h = FNV_64_OFFSET_BASIS; len > 0; ++p, --len) {
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h ^= *p;
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h *= FNV_64_PRIME;
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}
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return (h);
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}
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