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/*
* Copyright 20132018 Fabian Groffen
*
* 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/LICENSE2.0
*
* 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.
*/
#define FNV1A_32_OFFSET 2166136261UL
#define FNV1A_32_PRIME 16777619
/**
* 32bits unsigned FNV1a returning into hash, using p to as variable to
* walk over metric up to firstspace
*/
#define fnv1a_32(hash, p, metric, firstspace) \
hash = FNV1A_32_OFFSET; \
for (p = metric; p < firstspace; p++) \
hash = (hash ^ (unsigned int)*p) * FNV1A_32_PRIME;
#define FNV1A_64_OFFSET 14695981039346656037ULL
#define FNV1A_64_PRIME 1099511628211UL
/**
* 64bits unsigned FNV1a returning into hash, using p to as variable to
* walk over metric up to firstspace
*/
#define fnv1a_64(hash, p, metric, firstspace) \
hash = FNV1A_64_OFFSET; \
for (p = metric; p < firstspace; p++) \
hash = (hash ^ (unsigned long long int)*p) * FNV1A_64_PRIME;
