76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
/* $OpenBSD: src/lib/libutil/ohash.h,v 1.2 2014/06/02 18:52:03 deraadt Exp $ */
|
|
|
|
/* Copyright (c) 1999, 2004 Marc Espie <espie@openbsd.org>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef OHASH_H
|
|
#define OHASH_H
|
|
|
|
/* Open hashing support.
|
|
* Open hashing was chosen because it is much lighter than other hash
|
|
* techniques, and more efficient in most cases.
|
|
*/
|
|
|
|
/* user-visible data structure */
|
|
struct ohash_info {
|
|
ptrdiff_t key_offset;
|
|
void *data; /* user data */
|
|
void *(*calloc)(size_t, size_t, void *);
|
|
void (*free)(void *, void *);
|
|
void *(*alloc)(size_t, void *);
|
|
};
|
|
|
|
struct _ohash_record;
|
|
|
|
/* private structure. It's there just so you can do a sizeof */
|
|
struct ohash {
|
|
struct _ohash_record *t;
|
|
struct ohash_info info;
|
|
unsigned int size;
|
|
unsigned int total;
|
|
unsigned int deleted;
|
|
};
|
|
|
|
/* For this to be tweakable, we use small primitives, and leave part of the
|
|
* logic to the client application. e.g., hashing is left to the client
|
|
* application. We also provide a simple table entry lookup that yields
|
|
* a hashing table index (opaque) to be used in find/insert/remove.
|
|
* The keys are stored at a known position in the client data.
|
|
*/
|
|
__BEGIN_DECLS
|
|
void ohash_init(struct ohash *, unsigned, struct ohash_info *);
|
|
void ohash_delete(struct ohash *);
|
|
|
|
unsigned int ohash_lookup_interval(struct ohash *, const char *,
|
|
const char *, uint32_t);
|
|
unsigned int ohash_lookup_memory(struct ohash *, const char *,
|
|
size_t, uint32_t);
|
|
void *ohash_find(struct ohash *, unsigned int);
|
|
void *ohash_remove(struct ohash *, unsigned int);
|
|
void *ohash_insert(struct ohash *, unsigned int, void *);
|
|
void *ohash_first(struct ohash *, unsigned int *);
|
|
void *ohash_next(struct ohash *, unsigned int *);
|
|
unsigned int ohash_entries(struct ohash *);
|
|
|
|
void *ohash_create_entry(struct ohash_info *, const char *, const char **);
|
|
uint32_t ohash_interval(const char *, const char **);
|
|
|
|
unsigned int ohash_qlookupi(struct ohash *, const char *, const char **);
|
|
unsigned int ohash_qlookup(struct ohash *, const char *);
|
|
__END_DECLS
|
|
#endif
|