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/*
* Copyright (c) 2008 Nicira Networks.
*
* Permission to use, copy, modify, and/or 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.
*/
#ifndef BITMAP_H
#define BITMAP_H 1
#include <limits.h>
#include <stdlib.h>
#include "util.h"
#define BITMAP_ULONG_BITS (sizeof(unsigned long) * CHAR_BIT)
static inline unsigned long *
bitmap_unit__(const unsigned long *bitmap, size_t offset)
{
return (unsigned long *) &bitmap[offset / BITMAP_ULONG_BITS];
}
static inline unsigned long
bitmap_bit__(size_t offset)
{
return 1UL << (offset % BITMAP_ULONG_BITS);
}
static inline unsigned long *
bitmap_allocate(size_t n_bits)
{
return xcalloc(1, ROUND_UP(n_bits, BITMAP_ULONG_BITS));
}
static inline void
bitmap_free(unsigned long *bitmap)
{
free(bitmap);
}
static inline bool
bitmap_is_set(const unsigned long *bitmap, size_t offset)
{
return (*bitmap_unit__(bitmap, offset) & bitmap_bit__(offset)) != 0;
}
static inline void
bitmap_set1(unsigned long *bitmap, size_t offset)
{
*bitmap_unit__(bitmap, offset) |= bitmap_bit__(offset);
}
static inline void
bitmap_set0(unsigned long *bitmap, size_t offset)
{
*bitmap_unit__(bitmap, offset) &= ~bitmap_bit__(offset);
}
static inline void
bitmap_set(unsigned long *bitmap, size_t offset, bool value)
{
if (value) {
bitmap_set1(bitmap, offset);
} else {
bitmap_set0(bitmap, offset);
}
}
void bitmap_set_multiple(unsigned long *, size_t start, size_t count,
bool value);
bool bitmap_equal(const unsigned long *, const unsigned long *, size_t n);
#endif /* bitmap.h */
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