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/*
hashtbl - a handy and fast, free hash table implementation
Copyright (C) 2000, 2001 Ed L. Cashin
This program 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 program 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* hhash.c - the actual hash function based on cdb's
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
/* support platforms that don't yet conform to C99 */
#if HAVE_STDINT_H
#include <stdint.h>
#elif HAVE_INTTYPES_H
#include <inttypes.h>
#else
#error No stdint.h or inttypes.h found.
#endif
#include "hhash.h"
#ifdef ELC_FIND_LEAKS
#include "leakfind.h" /* checking for memory leaks */
#endif
/* These two functions are modified only slightly from the public domain
* code in Dan Bernstein's cdb package.
* */
#define CDB_HASHSTART 5381
inline static uint32_t cdb_hashadd(uint32_t h, uint8_t c)
{
h += (h << 5);
return h ^ c;
}
uint32_t hashtbl_cdb_hash(const char *key, size_t len)
{
uint32_t h;
h = CDB_HASHSTART;
while (len) {
h = cdb_hashadd(h, *key++);
--len;
}
return h;
}
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