60 lines
2.6 KiB
C
60 lines
2.6 KiB
C
/*
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* Copyright (c) 2000, 2001
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _BITMAP_H_
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#define _BITMAP_H_
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/*
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* Fixed-size array of bits. (Intended for storage management.)
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*
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* Functions:
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* bitmap_create - allocate a new bitmap object.
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* Returns NULL on error.
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* bitmap_getdata - return pointer to raw bit data (for I/O).
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* bitmap_alloc - locate a cleared bit, set it, and return its index.
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* bitmap_mark - set a clear bit by its index.
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* bitmap_unmark - clear a set bit by its index.
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* bitmap_isset - return whether a particular bit is set or not.
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* bitmap_destroy - destroy bitmap.
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*/
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struct bitmap; /* Opaque. */
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struct bitmap *bitmap_create(unsigned nbits);
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void *bitmap_getdata(struct bitmap *);
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int bitmap_alloc(struct bitmap *, unsigned *index);
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void bitmap_mark(struct bitmap *, unsigned index);
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void bitmap_unmark(struct bitmap *, unsigned index);
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int bitmap_isset(struct bitmap *, unsigned index);
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void bitmap_destroy(struct bitmap *);
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#endif /* _BITMAP_H_ */
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