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/* Licensed under LGPLv2+ - see LICENSE file for details */
#ifndef CCAN_BITMAP_H_
#define CCAN_BITMAP_H_
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <ccan/endian/endian.h>
typedef unsigned long bitmap_word;
#define BITMAP_WORD_BITS (sizeof(bitmap_word) * CHAR_BIT)
#define BITMAP_NWORDS(_n) \
(((_n) + BITMAP_WORD_BITS - 1) / BITMAP_WORD_BITS)
/*
* We wrap each word in a structure for type checking.
*/
typedef struct {
bitmap_word w;
} bitmap;
#define BITMAP_DECLARE(_name, _nbits) \
bitmap (_name)[BITMAP_NWORDS(_nbits)]
static inline size_t bitmap_sizeof(unsigned long nbits)
{
return BITMAP_NWORDS(nbits) * sizeof(bitmap_word);
}
static inline bitmap_word bitmap_bswap(bitmap_word w)
{
if (BITMAP_WORD_BITS == 32)
return (ENDIAN_CAST bitmap_word)cpu_to_be32(w);
else if (BITMAP_WORD_BITS == 64)
return (ENDIAN_CAST bitmap_word)cpu_to_be64(w);
}
#define BITMAP_WORD(_bm, _n) ((_bm)[(_n) / BITMAP_WORD_BITS].w)
#define BITMAP_WORDBIT(_n) \
(bitmap_bswap(1UL << (BITMAP_WORD_BITS - ((_n) % BITMAP_WORD_BITS) - 1)))
#define BITMAP_HEADWORDS(_nbits) \
((_nbits) / BITMAP_WORD_BITS)
#define BITMAP_HEADBYTES(_nbits) \
(BITMAP_HEADWORDS(_nbits) * sizeof(bitmap_word))
#define BITMAP_TAILWORD(_bm, _nbits) \
((_bm)[BITMAP_HEADWORDS(_nbits)].w)
#define BITMAP_HASTAIL(_nbits) (((_nbits) % BITMAP_WORD_BITS) != 0)
#define BITMAP_TAILBITS(_nbits) \
(bitmap_bswap(~(-1UL >> ((_nbits) % BITMAP_WORD_BITS))))
#define BITMAP_TAIL(_bm, _nbits) \
(BITMAP_TAILWORD(_bm, _nbits) & BITMAP_TAILBITS(_nbits))
static inline void bitmap_set_bit(bitmap *bitmap, unsigned long n)
{
BITMAP_WORD(bitmap, n) |= BITMAP_WORDBIT(n);
}
static inline void bitmap_clear_bit(bitmap *bitmap, unsigned long n)
{
BITMAP_WORD(bitmap, n) &= ~BITMAP_WORDBIT(n);
}
static inline void bitmap_change_bit(bitmap *bitmap, unsigned long n)
{
BITMAP_WORD(bitmap, n) ^= BITMAP_WORDBIT(n);
}
static inline bool bitmap_test_bit(const bitmap *bitmap, unsigned long n)
{
return !!(BITMAP_WORD(bitmap, n) & BITMAP_WORDBIT(n));
}
void bitmap_zero_range(bitmap *bitmap, unsigned long n, unsigned long m);
void bitmap_fill_range(bitmap *bitmap, unsigned long n, unsigned long m);
static inline void bitmap_zero(bitmap *bitmap, unsigned long nbits)
{
memset(bitmap, 0, bitmap_sizeof(nbits));
}
static inline void bitmap_fill(bitmap *bitmap, unsigned long nbits)
{
memset(bitmap, 0xff, bitmap_sizeof(nbits));
}
static inline void bitmap_copy(bitmap *dst, const bitmap *src,
unsigned long nbits)
{
memcpy(dst, src, bitmap_sizeof(nbits));
}
#define BITMAP_DEF_BINOP(_name, _op) \
static inline void bitmap_##_name(bitmap *dst, bitmap *src1, bitmap *src2, \
unsigned long nbits) \
{ \
unsigned long i = 0; \
for (i = 0; i < BITMAP_NWORDS(nbits); i++) { \
dst[i].w = src1[i].w _op src2[i].w; \
} \
}
BITMAP_DEF_BINOP(and, &)
BITMAP_DEF_BINOP(or, |)
BITMAP_DEF_BINOP(xor, ^)
BITMAP_DEF_BINOP(andnot, & ~)
#undef BITMAP_DEF_BINOP
static inline void bitmap_complement(bitmap *dst, const bitmap *src,
unsigned long nbits)
{
unsigned long i;
for (i = 0; i < BITMAP_NWORDS(nbits); i++)
dst[i].w = ~src[i].w;
}
static inline bool bitmap_equal(const bitmap *src1, const bitmap *src2,
unsigned long nbits)
{
return (memcmp(src1, src2, BITMAP_HEADBYTES(nbits)) == 0)
&& (!BITMAP_HASTAIL(nbits)
|| (BITMAP_TAIL(src1, nbits) == BITMAP_TAIL(src2, nbits)));
}
static inline bool bitmap_intersects(const bitmap *src1, const bitmap *src2,
unsigned long nbits)
{
unsigned long i;
for (i = 0; i < BITMAP_HEADWORDS(nbits); i++) {
if (src1[i].w & src2[i].w)
return true;
}
if (BITMAP_HASTAIL(nbits) &&
(BITMAP_TAIL(src1, nbits) & BITMAP_TAIL(src2, nbits)))
return true;
return false;
}
static inline bool bitmap_subset(const bitmap *src1, const bitmap *src2,
unsigned long nbits)
{
unsigned long i;
for (i = 0; i < BITMAP_HEADWORDS(nbits); i++) {
if (src1[i].w & ~src2[i].w)
return false;
}
if (BITMAP_HASTAIL(nbits) &&
(BITMAP_TAIL(src1, nbits) & ~BITMAP_TAIL(src2, nbits)))
return false;
return true;
}
static inline bool bitmap_full(const bitmap *bitmap, unsigned long nbits)
{
unsigned long i;
for (i = 0; i < BITMAP_HEADWORDS(nbits); i++) {
if (bitmap[i].w != -1UL)
return false;
}
if (BITMAP_HASTAIL(nbits) &&
(BITMAP_TAIL(bitmap, nbits) != BITMAP_TAILBITS(nbits)))
return false;
return true;
}
static inline bool bitmap_empty(const bitmap *bitmap, unsigned long nbits)
{
unsigned long i;
for (i = 0; i < BITMAP_HEADWORDS(nbits); i++) {
if (bitmap[i].w != 0)
return false;
}
if (BITMAP_HASTAIL(nbits) && (BITMAP_TAIL(bitmap, nbits) != 0))
return false;
return true;
}
unsigned long bitmap_ffs(const bitmap *bitmap,
unsigned long n, unsigned long m);
/*
* Allocation functions
*/
static inline bitmap *bitmap_alloc(unsigned long nbits)
{
return malloc(bitmap_sizeof(nbits));
}
static inline bitmap *bitmap_alloc0(unsigned long nbits)
{
bitmap *bitmap;
bitmap = bitmap_alloc(nbits);
if (bitmap)
bitmap_zero(bitmap, nbits);
return bitmap;
}
static inline bitmap *bitmap_alloc1(unsigned long nbits)
{
bitmap *bitmap;
bitmap = bitmap_alloc(nbits);
if (bitmap)
bitmap_fill(bitmap, nbits);
return bitmap;
}
static inline bitmap *bitmap_realloc0(bitmap *bitmap,
unsigned long obits, unsigned long nbits)
{
bitmap = realloc(bitmap, bitmap_sizeof(nbits));
if ((nbits > obits) && bitmap)
bitmap_zero_range(bitmap, obits, nbits);
return bitmap;
}
static inline bitmap *bitmap_realloc1(bitmap *bitmap,
unsigned long obits, unsigned long nbits)
{
bitmap = realloc(bitmap, bitmap_sizeof(nbits));
if ((nbits > obits) && bitmap)
bitmap_fill_range(bitmap, obits, nbits);
return bitmap;
}
#endif /* CCAN_BITMAP_H_ */
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