3 /* $OpenBSD: ohash.h,v 1.8 2005/12/29 18:54:47 jaredy Exp $ */
7 /* Copyright (c) 1999, 2004 Marc Espie <espie@openbsd.org>
9 * Permission to use, copy, modify, and distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies.
13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
24 /* Open hashing support.
25 * Open hashing was chosen because it is much lighter than other hash
26 * techniques, and more efficient in most cases.
31 void *data; /* user data */
32 void *(*halloc)(size_t, void *);
33 void (*hfree)(void *, size_t, void *);
34 void *(*alloc)(size_t, void *);
40 struct _ohash_record *t;
41 struct ohash_info info;
47 /* For this to be tweakable, we use small primitives, and leave part of the
48 * logic to the client application. e.g., hashing is left to the client
49 * application. We also provide a simple table entry lookup that yields
50 * a hashing table index (opaque) to be used in find/insert/remove.
51 * The keys are stored at a known position in the client data.
54 void ohash_init(struct ohash *, unsigned, struct ohash_info *);
55 void ohash_delete(struct ohash *);
57 unsigned int ohash_lookup_interval(struct ohash *, const char *,
58 const char *, u_int32_t);
59 unsigned int ohash_lookup_memory(struct ohash *, const char *,
61 void *ohash_find(struct ohash *, unsigned int);
62 void *ohash_remove(struct ohash *, unsigned int);
63 void *ohash_insert(struct ohash *, unsigned int, void *);
64 void *ohash_first(struct ohash *, unsigned int *);
65 void *ohash_next(struct ohash *, unsigned int *);
66 unsigned int ohash_entries(struct ohash *);
68 void *ohash_create_entry(struct ohash_info *, const char *, const char **);
69 u_int32_t ohash_interval(const char *, const char **);
71 unsigned int ohash_qlookupi(struct ohash *, const char *, const char **);
72 unsigned int ohash_qlookup(struct ohash *, const char *);