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131 lines
3.9 KiB
C
131 lines
3.9 KiB
C
/*
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* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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*
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* switch_hashtable_private.h -- Hashtable
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*
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*/
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/* hashtable_private.h -- Copyright (C) 2002, 2004 Christopher Clark <firstname.lastname@cl.cam.ac.uk> */
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#ifndef __HASHTABLE_PRIVATE_CWC22_H__
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#define __HASHTABLE_PRIVATE_CWC22_H__
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#include "switch_hashtable.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*****************************************************************************/
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struct entry
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{
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void *k, *v;
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unsigned int h;
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hashtable_flag_t flags;
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hashtable_destructor_t destructor;
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struct entry *next;
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};
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struct switch_hashtable_iterator {
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unsigned int pos;
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struct entry *e;
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struct switch_hashtable *h;
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};
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struct switch_hashtable {
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unsigned int tablelength;
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struct entry **table;
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unsigned int entrycount;
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unsigned int loadlimit;
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unsigned int primeindex;
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unsigned int (*hashfn) (void *k);
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int (*eqfn) (void *k1, void *k2);
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};
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/*****************************************************************************/
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/*****************************************************************************/
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static inline unsigned int
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hash(switch_hashtable_t *h, void *k)
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{
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/* Aim to protect against poor hash functions by adding logic here
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* - logic taken from java 1.4 hashtable source */
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unsigned int i = h->hashfn(k);
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i += ~(i << 9);
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i ^= ((i >> 14) | (i << 18)); /* >>> */
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i += (i << 4);
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i ^= ((i >> 10) | (i << 22)); /* >>> */
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return i;
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}
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/*****************************************************************************/
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/* indexFor */
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static __inline__ unsigned int
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indexFor(unsigned int tablelength, unsigned int hashvalue) {
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return (hashvalue % tablelength);
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}
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/* Only works if tablelength == 2^N */
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/*static inline unsigned int
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indexFor(unsigned int tablelength, unsigned int hashvalue)
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{
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return (hashvalue & (tablelength - 1u));
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}
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*/
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/*****************************************************************************/
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#define freekey(X) free(X)
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/*define freekey(X) ; */
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#ifdef __cplusplus
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}
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#endif
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/*****************************************************************************/
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#endif /* __HASHTABLE_PRIVATE_CWC22_H__*/
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/*
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* Copyright (c) 2002, Christopher Clark
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* All rights reserved.
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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
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* notice, 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
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of the original author; nor the names of any contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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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 OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* 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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/* For Emacs:
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* Local Variables:
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* mode:c
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* indent-tabs-mode:t
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* tab-width:4
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* c-basic-offset:4
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* End:
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* For VIM:
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* vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
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*/
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