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/* $Id: ihash.C,v 1.4 1999/01/01 00:07:46 dm Exp $ */
/*
*
* Copyright (C) 1998 David Mazieres (dm@uun.org)
*
* 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, 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
*
*/
#include "amisc.h"
#include "ihash.h"
#include "msb.h"
/* Some prime numbers <= powers of 2 */
const u_int exp2primes[33] = {
0x1, /* place holder */
0x2, 0x3, 0x7, 0xd,
0x1f, 0x3d, 0x7f, 0xfb,
0x1fd, 0x3fd, 0x7f7, 0xffd,
0x1fff, 0x3ffd, 0x7fed, 0xfff1,
0x1ffff, 0x3fffb, 0x7ffff, 0xffffd,
0x1ffff7, 0x3ffffd, 0x7ffff1, 0xfffffd,
0x1ffffd9, 0x3fffffb, 0x7ffffd9, 0xfffffc7,
0x1ffffffd, 0x3fffffdd, 0x7fffffff, 0xfffffffb,
};
#define hteof(p) ((_ihash_entry *) ((char *) (p) + eos))
void
_ihash_grow (_ihash_table *htp, const size_t eos)
{
u_int nbuckets;
void **ntab;
void *p, *np;
size_t i;
nbuckets = exp2primes[log2c(htp->buckets)+1];
if (nbuckets < 3)
nbuckets = 3;
ntab = New (void *[nbuckets]);
bzero (ntab, nbuckets * sizeof (*ntab));
for (i = 0; i < htp->buckets; i++)
for (p = htp->tab[i]; p; p = np) {
_ihash_entry *htep = hteof (p);
size_t ni = htep->val % nbuckets;
np = htep->next;
htep->next = ntab[ni];
htep->pprev = &ntab[ni];
if (ntab[ni])
hteof(ntab[ni])->pprev = &htep->next;
ntab[ni] = p;
}
delete[] htp->tab;
htp->tab = ntab;
htp->buckets = nbuckets;
}
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