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#include "internal/barray.h"
#include <string.h>
void * bit_array_create(size_t size)
{
size_t bsize = ((size + 7) >> 3) + sizeof(size_t);
void * ret = calloc(1, bsize);
if (ret) *(size_t *)ret = size;
return ret;
}
void bit_array_destroy(void * array)
{
if (array) free(array);
}
void * bit_array_dup(void * array)
{
if (array)
{
size_t * size = (size_t *) array;
size_t bsize = ((*size + 7) >> 3) + sizeof(*size);
void * ret = malloc(bsize);
if (ret) memcpy(ret, array, bsize);
return ret;
}
return NULL;
}
void bit_array_reset(void * array)
{
if (array)
{
size_t * size = (size_t *) array;
size_t bsize = (*size + 7) >> 3;
memset(size + 1, 0, bsize);
}
}
void bit_array_set(void * array, size_t bit)
{
if (array)
{
size_t * size = (size_t *) array;
if (bit < *size)
{
unsigned char * ptr = (unsigned char *)(size + 1);
ptr[bit >> 3] |= (1U << (bit & 7));
}
}
}
int bit_array_test(void * array, size_t bit)
{
if (array)
{
size_t * size = (size_t *) array;
if (bit < *size)
{
unsigned char * ptr = (unsigned char *)(size + 1);
if (ptr[bit >> 3] & (1U << (bit & 7)))
{
return 1;
}
}
}
return 0;
}
int bit_array_test_range(void * array, size_t bit, size_t count)
{
if (array)
{
size_t * size = (size_t *) array;
if (bit < *size)
{
unsigned char * ptr = (unsigned char *)(size + 1);
if ((bit & 7) && (count > 8))
{
while ((bit < *size) && count && (bit & 7))
{
if (ptr[bit >> 3] & (1U << (bit & 7))) return 1;
bit++;
count--;
}
}
if (!(bit & 7))
{
while (((*size - bit) >= 8) && (count >= 8))
{
if (ptr[bit >> 3]) return 1;
bit += 8;
count -= 8;
}
}
while ((bit < *size) && count)
{
if (ptr[bit >> 3] & (1U << (bit & 7))) return 1;
bit++;
count--;
}
}
}
return 0;
}
void bit_array_clear(void * array, size_t bit)
{
if (array)
{
size_t * size = (size_t *) array;
if (bit < *size)
{
unsigned char * ptr = (unsigned char *)(size + 1);
ptr[bit >> 3] &= ~(1U << (bit & 7));
}
}
}
void bit_array_merge(void * dest, void * source, size_t offset)
{
if (dest && source)
{
size_t * dsize = (size_t *) dest;
size_t * ssize = (size_t *) source;
size_t soffset = 0;
while (offset < *dsize && soffset < *ssize)
{
if (bit_array_test(source, soffset))
{
bit_array_set(dest, offset);
}
soffset++;
offset++;
}
}
}
void bit_array_mask(void * dest, void * source, size_t offset)
{
if (dest && source)
{
size_t * dsize = (size_t *) dest;
size_t * ssize = (size_t *) source;
size_t soffset = 0;
while (offset < *dsize && soffset < *ssize)
{
if (bit_array_test(source, soffset))
{
bit_array_clear(dest, offset);
}
soffset++;
offset++;
}
}
}
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