2017-10-20 09:56:39 +08:00
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/* $OpenBSD: bitmap.h,v 1.2 2017/10/20 01:56:39 djm Exp $ */
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2015-01-14 23:28:00 +08:00
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/*
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* Copyright (c) 2015 Damien Miller <djm@mindrot.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _BITMAP_H
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#define _BITMAP_H
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#include <sys/types.h>
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/* Simple bit vector routines */
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struct bitmap;
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/* Allocate a new bitmap. Returns NULL on allocation failure. */
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struct bitmap *bitmap_new(void);
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/* Free a bitmap */
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void bitmap_free(struct bitmap *b);
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/* Zero an existing bitmap */
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void bitmap_zero(struct bitmap *b);
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/* Test whether a bit is set in a bitmap. */
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int bitmap_test_bit(struct bitmap *b, u_int n);
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/* Set a bit in a bitmap. Returns 0 on success or -1 on error */
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int bitmap_set_bit(struct bitmap *b, u_int n);
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/* Clear a bit in a bitmap */
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void bitmap_clear_bit(struct bitmap *b, u_int n);
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/* Return the number of bits in a bitmap (i.e. the position of the MSB) */
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size_t bitmap_nbits(struct bitmap *b);
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/* Return the number of bytes needed to represent a bitmap */
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size_t bitmap_nbytes(struct bitmap *b);
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/* Convert a bitmap to a big endian byte string */
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int bitmap_to_string(struct bitmap *b, void *p, size_t l);
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/* Convert a big endian byte string to a bitmap */
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int bitmap_from_string(struct bitmap *b, const void *p, size_t l);
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#endif /* _BITMAP_H */
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