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/*
* Copyright (c) 2008, 2009, 2010 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#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 size_t
bitmap_n_longs(size_t n_bits)
{
return DIV_ROUND_UP(n_bits, BITMAP_ULONG_BITS);
}
static inline size_t
bitmap_n_bytes(size_t n_bits)
{
return bitmap_n_longs(n_bits) * sizeof(unsigned long int);
}
static inline unsigned long *
bitmap_allocate(size_t n_bits)
{
return xzalloc(bitmap_n_bytes(n_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);
size_t bitmap_scan(const unsigned long int *, size_t start, size_t end);
#define BITMAP_FOR_EACH_1(IDX, SIZE, BITMAP) \
for ((IDX) = bitmap_scan(BITMAP, 0, SIZE); (IDX) < (SIZE); \
(IDX) = bitmap_scan(BITMAP, (IDX) + 1, SIZE))
#endif /* bitmap.h */
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