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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*/
#include <config.h>
#include <parc/algol/parc_HashCode.h>
#if PARCHashCodeSize == 64
static const PARCHashCode _fnv1a_prime = 0x00000100000001B3ULL;
const PARCHashCode parcHashCode_InitialValue = 0xCBF29CE484222325ULL;
#else
static const PARCHashCode _fnv1a_prime = 0x01000193;
const PARCHashCode parcHashCode_InitialValue = 0x811C9DC5;
#endif
PARCHashCode
parcHashCode_HashImpl(const uint8_t *memory, size_t length, PARCHashCode initialValue)
{
// Standard FNV 64-bit prime: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param
PARCHashCode hash = initialValue;
for (size_t i = 0; i < length; i++) {
hash = hash ^ memory[i];
hash = hash * _fnv1a_prime;
}
return hash;
}
PARCHashCode
parcHashCode_HashHashCode(PARCHashCode initialValue, PARCHashCode update)
{
return parcHashCode_HashImpl((uint8_t *) &update, sizeof(PARCHashCode), initialValue);
}
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