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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1998-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*
*/
#include "hash.h"
/* This is hashpjw, from the dragon book */
/* Note that this function is only used as a default hash function.
* All calls are made through the hash pointer in the tab structure.
* The only place this function is explicitly referenced is in
* hash_newtab(); Users can use hash_setfunc() to change the hash function.
*/
int ei_dohash(const char *key)
{
const char *s;
unsigned h = 0;
unsigned g;
for (s=key; *s; s++) {
h = (h << 4) + *s;
if ((g = (h & 0xf0000000))) { /* assumes 32-bit int */
h = h^(g >> 24);
h = h^g;
}
}
return h;
}
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