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djm@openbsd.orgb011edb2017-10-20 01:56:39 +00001/* $OpenBSD: bitmap.h,v 1.2 2017/10/20 01:56:39 djm Exp $ */
Damien Miller4f38c612015-01-15 02:28:00 +11002/*
3 * Copyright (c) 2015 Damien Miller <djm@mindrot.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#ifndef _BITMAP_H
19#define _BITMAP_H
20
21#include <sys/types.h>
22
23/* Simple bit vector routines */
24
25struct bitmap;
26
27/* Allocate a new bitmap. Returns NULL on allocation failure. */
28struct bitmap *bitmap_new(void);
29
30/* Free a bitmap */
31void bitmap_free(struct bitmap *b);
32
33/* Zero an existing bitmap */
34void bitmap_zero(struct bitmap *b);
35
36/* Test whether a bit is set in a bitmap. */
37int bitmap_test_bit(struct bitmap *b, u_int n);
38
39/* Set a bit in a bitmap. Returns 0 on success or -1 on error */
40int bitmap_set_bit(struct bitmap *b, u_int n);
41
42/* Clear a bit in a bitmap */
43void bitmap_clear_bit(struct bitmap *b, u_int n);
44
45/* Return the number of bits in a bitmap (i.e. the position of the MSB) */
46size_t bitmap_nbits(struct bitmap *b);
47
48/* Return the number of bytes needed to represent a bitmap */
49size_t bitmap_nbytes(struct bitmap *b);
50
51/* Convert a bitmap to a big endian byte string */
52int bitmap_to_string(struct bitmap *b, void *p, size_t l);
53
54/* Convert a big endian byte string to a bitmap */
55int bitmap_from_string(struct bitmap *b, const void *p, size_t l);
56
57#endif /* _BITMAP_H */