160 lines
3.2 KiB
C
160 lines
3.2 KiB
C
/*
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hash.h
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hash tables
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Copyright (C) 1996-1997 Id Software, Inc.
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Copyright (C) 2000 Marcus Sundberg <mackan@stacken.kth.se>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include "QF/compat.h"
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#include "QF/hash.h"
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static unsigned long
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hash (const char *str)
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{
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//FIXME not 64 bit clean
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#if 0
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unsigned long h = 0;
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while (*str) {
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h = (h << 4) + (unsigned char)*str++;
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if (h&0xf0000000)
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h = (h ^ (h >> 24)) & 0xfffffff;
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}
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return h;
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#else
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// dx_hack_hash
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// shamelessly stolen from Daniel Phillips <phillips@innominate.de>
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// from his post to lkml
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unsigned long hash0 = 0x12a3fe2d, hash1 = 0x37abe8f9;
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while (*str)
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{
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unsigned long hash = hash1 + (hash0 ^ (*str++ * 71523));
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if (hash < 0) hash -= 0x7fffffff;
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hash1 = hash0;
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hash0 = hash;
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}
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return hash0;
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#endif
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}
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hashtab_t *
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Hash_NewTable (int tsize, char *(*gk)(void*,void*), void (*f)(void*,void*),
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void *ud)
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{
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hashtab_t *tab = calloc (1, (size_t)&((hashtab_t*)0)->tab[tsize]);
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if (!tab)
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return 0;
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tab->tab_size = tsize;
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tab->user_data = ud;
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tab->get_key = gk;
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tab->free_ele = f;
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return tab;
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}
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void
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Hash_DelTable (hashtab_t *tab)
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{
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Hash_FlushTable (tab);
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free (tab);
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}
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void
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Hash_FlushTable (hashtab_t *tab)
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{
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int i;
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for (i = 0; i < tab->tab_size; i++) {
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while (tab->tab[i]) {
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hashlink_t *t = tab->tab[i]->next;
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if (tab->free_ele)
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tab->free_ele (tab->tab[i]->data, tab->user_data);
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free (tab->tab[i]);
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tab->tab[i] = t;
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}
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}
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}
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int
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Hash_Add (hashtab_t *tab, void *ele)
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{
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unsigned long h = hash (tab->get_key(ele, tab->user_data));
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size_t ind = h % tab->tab_size;
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hashlink_t *lnk = malloc (sizeof (hashlink_t));
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if (!lnk)
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return -1;
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if (tab->tab[ind])
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tab->tab[ind]->prev = &lnk->next;
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lnk->next = tab->tab[ind];
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lnk->prev = &tab->tab[ind];
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lnk->data = ele;
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tab->tab[ind] = lnk;
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return 0;
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}
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void *
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Hash_Find (hashtab_t *tab, const char *key)
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{
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unsigned long h = hash (key);
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size_t ind = h % tab->tab_size;
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hashlink_t *lnk = tab->tab[ind];
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while (lnk) {
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if (strequal (key, tab->get_key (lnk->data, tab->user_data)))
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return lnk->data;
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lnk = lnk->next;
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}
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return 0;
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}
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int
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Hash_Del (hashtab_t *tab, const char *key)
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{
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unsigned long h = hash (key);
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size_t ind = h % tab->tab_size;
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hashlink_t *lnk = tab->tab[ind];
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while (lnk) {
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if (strequal (key, tab->get_key (lnk->data, tab->user_data))) {
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if (lnk->next)
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lnk->next->prev = lnk->prev;
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*lnk->prev = lnk->next;
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free (lnk);
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return 0;
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}
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lnk = lnk->next;
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}
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return -1;
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}
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