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73 lines
2.0 KiB
73 lines
2.0 KiB
/*
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* Copyright © 2009 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Eric Anholt <eric@anholt.net>
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*/
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/* Quick FNV-1a hash implementation based on:
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* http://www.isthe.com/chongo/tech/comp/fnv/
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*
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* FNV-1a may not be the best hash out there -- Jenkins's lookup3 is supposed
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* to be quite good, and it may beat FNV. But FNV has the advantage that it
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* involves almost no code.
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*/
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#include <string.h>
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#include <ravi_fnv_hash.h>
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uint32_t
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fnv1_hash_string(const char *key)
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{
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uint32_t hash = 2166136261ul;
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const uint8_t *bytes = (uint8_t *)key;
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while (*bytes != 0) {
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hash ^= *bytes;
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hash = hash * 0x01000193;
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bytes++;
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}
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return hash;
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}
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uint32_t
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fnv1_hash_data(const void *data, size_t size)
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{
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uint32_t hash = 2166136261ul;
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const uint8_t *bytes = (uint8_t *)data;
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while (size-- != 0) {
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hash ^= *bytes;
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hash = hash * 0x01000193;
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bytes++;
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}
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return hash;
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}
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int
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string_key_equals(const void *a, const void *b)
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{
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return strcmp(a, b) == 0;
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}
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