void pc_hash_int(unsigned char * buffer, char salt, int element) {
unsigned char item[5];
memcpy(item, &salt, 1);
memcpy(item+1, &element, 4);
pg_md5_binary(item, 5, buffer);
}
void pc_hash_text(unsigned char * buffer, char salt, const char * element, int elen) {
unsigned char item[elen + 1];
memcpy(item, &salt, 1);
memcpy(item+1, element, elen);
pg_md5_binary(item, elen + 1, buffer);
}
void pcsa_add_element(PCSACounter pcsa, const char * element, int elen) {
/* get the hash */
unsigned char hash[HASH_LENGTH];
/* compute the hash */
pg_md5_binary(element, elen, hash);
/* add the hash to the counter */
pcsa_add_hash(pcsa, hash);
}
void hyperloglog_add_element(HyperLogLogCounter hloglog, const char * element, int elen) {
/* get the hash */
unsigned char hash[HASH_LENGTH];
/* compute the hash using the salt */
pg_md5_binary(element, elen, hash);
/* add the hash to the estimator */
hyperloglog_add_hash(hloglog, hash);
}
/* computes a hash of the int element (and stores it in the buffer) */
void ac_hash_int(unsigned char * buffer, int element) {
pg_md5_binary(&element, sizeof(int), buffer);
}
/* compute hash of the text element (and stores it in the buffer) */
void ac_hash_text(unsigned char * buffer, const char * element, int elen) {
pg_md5_binary(element, elen, buffer);
}
