1228063Sbapt#ifndef OHASH_H 2228063Sbapt#define OHASH_H 3228063Sbapt/* $OpenBSD: ohash.h,v 1.8 2005/12/29 18:54:47 jaredy Exp $ */ 4228063Sbapt/* ex:ts=8 sw=4: 5228063Sbapt */ 6228063Sbapt 7228063Sbapt/* Copyright (c) 1999, 2004 Marc Espie <espie@openbsd.org> 8228063Sbapt * 9228063Sbapt * Permission to use, copy, modify, and distribute this software for any 10228063Sbapt * purpose with or without fee is hereby granted, provided that the above 11228063Sbapt * copyright notice and this permission notice appear in all copies. 12228063Sbapt * 13228063Sbapt * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 14228063Sbapt * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 15228063Sbapt * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 16228063Sbapt * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 17228063Sbapt * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 18228063Sbapt * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 19228063Sbapt * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 20228063Sbapt * 21228063Sbapt * $FreeBSD$ 22228063Sbapt */ 23228063Sbapt 24228063Sbapt/* Open hashing support. 25228063Sbapt * Open hashing was chosen because it is much lighter than other hash 26228063Sbapt * techniques, and more efficient in most cases. 27228063Sbapt */ 28228063Sbapt 29228063Sbaptstruct ohash_info { 30228063Sbapt ptrdiff_t key_offset; 31228063Sbapt void *data; /* user data */ 32228063Sbapt void *(*halloc)(size_t, void *); 33228063Sbapt void (*hfree)(void *, size_t, void *); 34228063Sbapt void *(*alloc)(size_t, void *); 35228063Sbapt}; 36228063Sbapt 37228063Sbaptstruct _ohash_record; 38228063Sbapt 39228063Sbaptstruct ohash { 40228063Sbapt struct _ohash_record *t; 41228063Sbapt struct ohash_info info; 42228063Sbapt unsigned int size; 43228063Sbapt unsigned int total; 44228063Sbapt unsigned int deleted; 45228063Sbapt}; 46228063Sbapt 47228063Sbapt/* For this to be tweakable, we use small primitives, and leave part of the 48228063Sbapt * logic to the client application. e.g., hashing is left to the client 49228063Sbapt * application. We also provide a simple table entry lookup that yields 50228063Sbapt * a hashing table index (opaque) to be used in find/insert/remove. 51228063Sbapt * The keys are stored at a known position in the client data. 52228063Sbapt */ 53228063Sbapt__BEGIN_DECLS 54228063Sbaptvoid ohash_init(struct ohash *, unsigned, struct ohash_info *); 55228063Sbaptvoid ohash_delete(struct ohash *); 56228063Sbapt 57228063Sbaptunsigned int ohash_lookup_interval(struct ohash *, const char *, 58228063Sbapt const char *, u_int32_t); 59228063Sbaptunsigned int ohash_lookup_memory(struct ohash *, const char *, 60228063Sbapt size_t, u_int32_t); 61228063Sbaptvoid *ohash_find(struct ohash *, unsigned int); 62228063Sbaptvoid *ohash_remove(struct ohash *, unsigned int); 63228063Sbaptvoid *ohash_insert(struct ohash *, unsigned int, void *); 64228063Sbaptvoid *ohash_first(struct ohash *, unsigned int *); 65228063Sbaptvoid *ohash_next(struct ohash *, unsigned int *); 66228063Sbaptunsigned int ohash_entries(struct ohash *); 67228063Sbapt 68228063Sbaptvoid *ohash_create_entry(struct ohash_info *, const char *, const char **); 69228063Sbaptu_int32_t ohash_interval(const char *, const char **); 70228063Sbapt 71228063Sbaptunsigned int ohash_qlookupi(struct ohash *, const char *, const char **); 72228063Sbaptunsigned int ohash_qlookup(struct ohash *, const char *); 73228063Sbapt__END_DECLS 74228063Sbapt#endif 75228063Sbapt 76