includes/hash.h

   1 /* hash.h
   2
   3    Definitions for hashing... */
   4
   5 /*
   6  * Copyright (c) 1996-1999 Internet Software Consortium.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of The Internet Software Consortium nor the names
  19  *    of its contributors may be used to endorse or promote products derived
  20  *    from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
  23  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  24  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  * DISCLAIMED.  IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
  27  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  29  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  30  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  31  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  32  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  33  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * This software has been written for the Internet Software Consortium
  37  * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
  38  * To learn more about the Internet Software Consortium, see
  39  * ``http://www.isc.org/''.  To learn more about Vixie Enterprises,
  40  * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
  41  * ``http://www.nominum.com''.
  42  */
  43
  44 #define DEFAULT_HASH_SIZE       97
  45
  46 typedef int (*hash_reference) (void *, void *, const char *, int);
  47 typedef int (*hash_dereference) (void *, const char *, int);
  48
  49 struct hash_bucket {
  50         struct hash_bucket *next;
  51         const unsigned char *name;
  52         unsigned len;
  53         void *value;
  54 };
  55
  56 struct hash_table {
  57         unsigned hash_count;
  58         struct hash_bucket *buckets [DEFAULT_HASH_SIZE];
  59         hash_reference referencer;
  60         hash_dereference dereferencer;
  61 };
  62
  63 struct named_hash {
  64         struct named_hash *next;
  65         const char *name;
  66         struct hash_table *hash;
  67 };