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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "alloc-util.h"
#include "bitmap.h"
#include "hashmap.h"
#include "macro.h"
#include "memory-util.h"
/* Bitmaps are only meant to store relatively small numbers
* (corresponding to, say, an enum), so it is ok to limit
* the max entry. 64k should be plenty. */
#define BITMAPS_MAX_ENTRY 0xffff
/* This indicates that we reached the end of the bitmap */
#define BITMAP_END (UINT_MAX)
#define BITMAP_NUM_TO_OFFSET(n) ((n) / (sizeof(uint64_t) * 8))
#define BITMAP_NUM_TO_REM(n) ((n) % (sizeof(uint64_t) * 8))
#define BITMAP_OFFSET_TO_NUM(offset, rem) ((offset) * sizeof(uint64_t) * 8 + (rem))
Bitmap* bitmap_new(void) {
return new0(Bitmap, 1);
}
Bitmap* bitmap_copy(Bitmap *b) {
Bitmap *ret;
ret = bitmap_new();
if (!ret)
return NULL;
ret->bitmaps = newdup(uint64_t, b->bitmaps, b->n_bitmaps);
if (!ret->bitmaps)
return mfree(ret);
ret->n_bitmaps = b->n_bitmaps;
return ret;
}
Bitmap* bitmap_free(Bitmap *b) {
if (!b)
return NULL;
free(b->bitmaps);
return mfree(b);
}
int bitmap_ensure_allocated(Bitmap **b) {
Bitmap *a;
assert(b);
if (*b)
return 0;
a = bitmap_new();
if (!a)
return -ENOMEM;
*b = a;
return 0;
}
int bitmap_set(Bitmap *b, unsigned n) {
uint64_t bitmask;
unsigned offset;
assert(b);
/* we refuse to allocate huge bitmaps */
if (n > BITMAPS_MAX_ENTRY)
return -ERANGE;
offset = BITMAP_NUM_TO_OFFSET(n);
if (offset >= b->n_bitmaps) {
if (!GREEDY_REALLOC0(b->bitmaps, offset + 1))
return -ENOMEM;
b->n_bitmaps = offset + 1;
}
bitmask = UINT64_C(1) << BITMAP_NUM_TO_REM(n);
b->bitmaps[offset] |= bitmask;
return 0;
}
void bitmap_unset(Bitmap *b, unsigned n) {
uint64_t bitmask;
unsigned offset;
if (!b)
return;
offset = BITMAP_NUM_TO_OFFSET(n);
if (offset >= b->n_bitmaps)
return;
bitmask = UINT64_C(1) << BITMAP_NUM_TO_REM(n);
b->bitmaps[offset] &= ~bitmask;
}
bool bitmap_isset(const Bitmap *b, unsigned n) {
uint64_t bitmask;
unsigned offset;
if (!b)
return false;
offset = BITMAP_NUM_TO_OFFSET(n);
if (offset >= b->n_bitmaps)
return false;
bitmask = UINT64_C(1) << BITMAP_NUM_TO_REM(n);
return !!(b->bitmaps[offset] & bitmask);
}
bool bitmap_isclear(const Bitmap *b) {
unsigned i;
if (!b)
return true;
for (i = 0; i < b->n_bitmaps; i++)
if (b->bitmaps[i] != 0)
return false;
return true;
}
void bitmap_clear(Bitmap *b) {
if (!b)
return;
b->bitmaps = mfree(b->bitmaps);
b->n_bitmaps = 0;
}
bool bitmap_iterate(const Bitmap *b, Iterator *i, unsigned *n) {
uint64_t bitmask;
unsigned offset, rem;
assert(i);
assert(n);
if (!b || i->idx == BITMAP_END)
return false;
offset = BITMAP_NUM_TO_OFFSET(i->idx);
rem = BITMAP_NUM_TO_REM(i->idx);
bitmask = UINT64_C(1) << rem;
for (; offset < b->n_bitmaps; offset++) {
if (b->bitmaps[offset]) {
for (; bitmask; bitmask <<= 1, rem++) {
if (b->bitmaps[offset] & bitmask) {
*n = BITMAP_OFFSET_TO_NUM(offset, rem);
i->idx = *n + 1;
return true;
}
}
}
rem = 0;
bitmask = 1;
}
i->idx = BITMAP_END;
return false;
}
bool bitmap_equal(const Bitmap *a, const Bitmap *b) {
size_t common_n_bitmaps;
const Bitmap *c;
unsigned i;
if (a == b)
return true;
if (!a != !b)
return false;
if (!a)
return true;
common_n_bitmaps = MIN(a->n_bitmaps, b->n_bitmaps);
if (memcmp_safe(a->bitmaps, b->bitmaps, sizeof(uint64_t) * common_n_bitmaps) != 0)
return false;
c = a->n_bitmaps > b->n_bitmaps ? a : b;
for (i = common_n_bitmaps; i < c->n_bitmaps; i++)
if (c->bitmaps[i] != 0)
return false;
return true;
}
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