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72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
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/*
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* util/storage/lookup3.h - header file for hashing functions.
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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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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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains header definitions for the hash functions we use.
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* The hash functions are public domain (see lookup3.c).
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*/
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#ifndef UTIL_STORAGE_LOOKUP3_H
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#define UTIL_STORAGE_LOOKUP3_H
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/**
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* Hash key made of 4byte chunks.
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* @param k: the key, an array of uint32_t values
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* @param length: the length of the key, in uint32_ts
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* @param initval: the previous hash, or an arbitrary value
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* @return: hash value.
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*/
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uint32_t hashword(const uint32_t *k, size_t length, uint32_t initval);
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/**
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* Hash key data.
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* @param k: the key, array of uint8_t
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* @param length: the length of the key, in uint8_ts
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* @param initval: the previous hash, or an arbitrary value
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* @return: hash value.
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*/
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uint32_t hashlittle(const void *k, size_t length, uint32_t initval);
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/**
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* Set the randomisation initial value, set this before threads start,
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* and before hashing stuff (because it changes subsequent results).
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* @param v: value
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*/
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void hash_set_raninit(uint32_t v);
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#endif /* UTIL_STORAGE_LOOKUP3_H */
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