12c1ae072Ssthen /* 22c1ae072Ssthen * util/storage/lookup3.h - header file for hashing functions. 32c1ae072Ssthen * 42c1ae072Ssthen * Copyright (c) 2007, NLnet Labs. All rights reserved. 52c1ae072Ssthen * 62c1ae072Ssthen * This software is open source. 72c1ae072Ssthen * 82c1ae072Ssthen * Redistribution and use in source and binary forms, with or without 92c1ae072Ssthen * modification, are permitted provided that the following conditions 102c1ae072Ssthen * are met: 112c1ae072Ssthen * 122c1ae072Ssthen * Redistributions of source code must retain the above copyright notice, 132c1ae072Ssthen * this list of conditions and the following disclaimer. 142c1ae072Ssthen * 152c1ae072Ssthen * Redistributions in binary form must reproduce the above copyright notice, 162c1ae072Ssthen * this list of conditions and the following disclaimer in the documentation 172c1ae072Ssthen * and/or other materials provided with the distribution. 182c1ae072Ssthen * 192c1ae072Ssthen * Neither the name of the NLNET LABS nor the names of its contributors may 202c1ae072Ssthen * be used to endorse or promote products derived from this software without 212c1ae072Ssthen * specific prior written permission. 222c1ae072Ssthen * 232c1ae072Ssthen * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24*cbbc2d6cSbrad * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25*cbbc2d6cSbrad * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26*cbbc2d6cSbrad * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27*cbbc2d6cSbrad * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28*cbbc2d6cSbrad * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29*cbbc2d6cSbrad * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30*cbbc2d6cSbrad * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31*cbbc2d6cSbrad * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32*cbbc2d6cSbrad * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33*cbbc2d6cSbrad * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 342c1ae072Ssthen */ 352c1ae072Ssthen 362c1ae072Ssthen /** 372c1ae072Ssthen * \file 382c1ae072Ssthen * 392c1ae072Ssthen * This file contains header definitions for the hash functions we use. 402c1ae072Ssthen * The hash functions are public domain (see lookup3.c). 412c1ae072Ssthen */ 422c1ae072Ssthen 432c1ae072Ssthen #ifndef UTIL_STORAGE_LOOKUP3_H 442c1ae072Ssthen #define UTIL_STORAGE_LOOKUP3_H 452c1ae072Ssthen 462c1ae072Ssthen /** 472c1ae072Ssthen * Hash key made of 4byte chunks. 482c1ae072Ssthen * @param k: the key, an array of uint32_t values 492c1ae072Ssthen * @param length: the length of the key, in uint32_ts 502c1ae072Ssthen * @param initval: the previous hash, or an arbitrary value 512c1ae072Ssthen * @return: hash value. 522c1ae072Ssthen */ 532c1ae072Ssthen uint32_t hashword(const uint32_t *k, size_t length, uint32_t initval); 542c1ae072Ssthen 552c1ae072Ssthen /** 562c1ae072Ssthen * Hash key data. 572c1ae072Ssthen * @param k: the key, array of uint8_t 582c1ae072Ssthen * @param length: the length of the key, in uint8_ts 592c1ae072Ssthen * @param initval: the previous hash, or an arbitrary value 602c1ae072Ssthen * @return: hash value. 612c1ae072Ssthen */ 622c1ae072Ssthen uint32_t hashlittle(const void *k, size_t length, uint32_t initval); 632c1ae072Ssthen 642c1ae072Ssthen /** 652c1ae072Ssthen * Set the randomisation initial value, set this before threads start, 662c1ae072Ssthen * and before hashing stuff (because it changes subsequent results). 672c1ae072Ssthen * @param v: value 682c1ae072Ssthen */ 692c1ae072Ssthen void hash_set_raninit(uint32_t v); 702c1ae072Ssthen 712c1ae072Ssthen #endif /* UTIL_STORAGE_LOOKUP3_H */ 72