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/*
* libdpkg - Debian packaging suite library routines
* strhash.c - FNV string hashing support
*
* Copyright © 2003 Daniel Silverstone <dsilvers@digital-scurf.org>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <dpkg/string.h>
#define FNV_OFFSET_BASIS 2166136261UL
#define FNV_MIXING_PRIME 16777619UL
/**
* Fowler/Noll/Vo -- FNV-1a simple string hash.
*
* For more info, @see <http://www.isthe.com/chongo/tech/comp/fnv/index.html>.
*
* @param str The string to hash.
*
* @return The hashed value.
*/
unsigned int
str_fnv_hash(const char *str)
{
unsigned int h = FNV_OFFSET_BASIS;
unsigned int p = FNV_MIXING_PRIME;
while (*str) {
h ^= *str++;
h *= p;
}
return h;
}
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