MBArray * mbarray_Copy_Template(MBArray * src, char * filename, int perms)
{
int header_len = mbarray_HeaderLen(src);
char * header;
if (header_len < 0) {
return NULL;
}
if (!strcmp(filename, src->filename)) {
errno = EINVAL;
return NULL;
}
header = (char *)malloc(header_len + 1);
if (header == NULL) {
errno = ENOMEM;
return NULL;
}
if (mbarray_Header(header, src, header_len) == NULL) {
free(header);
return NULL;
}
return mbarray_Create(
src->bits,
filename,
header,
header_len,
O_CREAT | O_RDWR,
perms);
}
int main(int argc, char ** argv)
{
BTYPE bit;
int value;
MBArray * array;
int i;
if (argc < 3) {
fprintf(stderr, "Usage: %s FILE BIT [VALUE]\nValue is either 0 or 1 and will define a set/clear operation.\n", argv[0]);
return 255;
}
/* Open file */
array = mbarray_Create(
0,
argv[1],
"",
0,
O_RDWR,
0);
if (!array)
goto error;
bit = atol(argv[2]);
if (argc > 3) {
value = atol(argv[3]);
if (value) {
if (mbarray_Set(array, bit))
goto error;
}
else {
if (mbarray_Clear(array, bit))
goto error;
}
}
for (i = 0; i < array->bits; i++) {
mbarray_Set(array, i);
mbarray_Test(array, i);
}
getc(stdin);
bit = 1 - mbarray_Test(array, bit);
mbarray_Destroy(array);
return bit;
error:
fprintf(stderr, "Error: %s [%d]\n", strerror(errno), errno);
return 255;
}
BloomFilter *bloomfilter_Create(size_t max_num_elem, double error_rate,
const char * file, BTYPE num_bits, int oflags, int perms,
int *hash_seeds, int num_hashes)
{
BloomFilter * bf = (BloomFilter *)malloc(sizeof(BloomFilter));
MBArray * array;
if (!bf) {
return NULL;
}
bf->max_num_elem = max_num_elem;
bf->error_rate = error_rate;
bf->num_hashes = num_hashes;
bf->count_correct = 1;
bf->bf_version = BF_CURRENT_VERSION;
bf->elem_count = 0;
memset(bf->reserved, sizeof(uint32_t) * 32, 0);
memset(bf->hash_seeds, sizeof(uint32_t) * 256, 0);
memcpy(bf->hash_seeds, hash_seeds, sizeof(uint32_t) * num_hashes);
array = mbarray_Create(num_bits, file, (char *)bf, sizeof(BloomFilter), oflags, perms);
if (!array) {
bloomfilter_Destroy(bf);
return NULL;
}
/* After we create the new array object, this array may already
have all of the bloom filter data from the file in the
header info.
By calling mbarray_Header, we copy that header data
back into this BloomFilter object.
*/
if (mbarray_Header((char *)bf, array, sizeof(BloomFilter)) == NULL) {
bloomfilter_Destroy(bf);
mbarray_Destroy(array);
return NULL;
}
/* Since we just initialized from a file, we have to
fix our pointers */
bf->array = array;
return bf;
}
int main(int argc, char ** argv)
{
MBArray * array;
if (argc < 3) {
fprintf(stderr, "Usage: %s FILENAME SIZE\nCreate new mmap'd array file.\n", argv[0]);
return 1;
}
array = mbarray_Create(
atol(argv[2]),
argv[1],
"",
0,
O_RDWR | O_CREAT,
0777);
if (!array)
goto error;
mbarray_ClearAll(array);
mbarray_Destroy(array);
return 0;
error:
fprintf(stderr, "Error: %s [%d]\n", strerror(errno), errno);
return 255;
}