/* http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx#existing
* One-at-a-Time hash
*/
static guint
conversation_hash_exact(gconstpointer v)
{
const conversation_key *key = (const conversation_key *)v;
guint hash_val;
address tmp_addr;
hash_val = 0;
tmp_addr.len = 4;
ADD_ADDRESS_TO_HASH(hash_val, &key->addr1);
tmp_addr.data = &key->port1;
ADD_ADDRESS_TO_HASH(hash_val, &tmp_addr);
ADD_ADDRESS_TO_HASH(hash_val, &key->addr2);
tmp_addr.data = &key->port2;
ADD_ADDRESS_TO_HASH(hash_val, &tmp_addr);
hash_val += ( hash_val << 3 );
hash_val ^= ( hash_val >> 11 );
hash_val += ( hash_val << 15 );
return hash_val;
}
/*
* Compute the hash value for two given address/port pairs if the match
* has a wildcard port 2.
*/
static guint
conversation_hash_no_port2(gconstpointer v)
{
const conversation_key *key = (const conversation_key *)v;
guint hash_val;
hash_val = 0;
ADD_ADDRESS_TO_HASH(hash_val, &key->addr1);
hash_val += key->port1;
ADD_ADDRESS_TO_HASH(hash_val, &key->addr2);
return hash_val;
}
/** Compute the hash value for two given address/port pairs.
* (Parameter type is gconstpointer for GHashTable compatibility.)
*
* @param key Conversation. MUST point to a conv_key_t struct.
* @return Computed key hash.
*/
static guint
conversation_hash(gconstpointer v)
{
const conv_key_t *key = (const conv_key_t *)v;
guint hash_val;
hash_val = 0;
ADD_ADDRESS_TO_HASH(hash_val, &key->addr1);
hash_val += key->port1;
ADD_ADDRESS_TO_HASH(hash_val, &key->addr2);
hash_val += key->port2;
hash_val ^= key->conv_id;
return hash_val;
}
/*
* Compute the hash value for a given address/port pairs if the match
* is to be exact.
*/
static guint
host_hash(gconstpointer v)
{
const host_key_t *key = (const host_key_t *)v;
guint hash_val;
hash_val = 0;
ADD_ADDRESS_TO_HASH(hash_val, &key->myaddress);
hash_val += key->port;
return hash_val;
}