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- #ifndef OHASH_H
- #define OHASH_H
- /* $OpenBSD: ohash.h,v 1.10 2012/09/23 15:05:23 espie Exp $ */
- /* ex:ts=8 sw=4:
- */
-
- /* 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.
- */
-
- /* Open hashing support.
- * Open hashing was chosen because it is much lighter than other hash
- * techniques, and more efficient in most cases.
- */
-
- struct ohash_info {
- ptrdiff_t key_offset;
- void *data; /* user data */
- void *(*halloc)(size_t, void *);
- void (*hfree)(void *, size_t, void *);
- void *(*alloc)(size_t, void *);
- };
-
- struct _ohash_record;
-
- 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)
- __attribute__ ((__bounded__(__string__,2,3)));
- 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
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