Get the hash table entry corresponding to a given filename.

def get_hash_table_entry(self, filename):
        """Get the hash table entry corresponding to a given filename."""
        hash_a = self._hash(filename, 'HASH_A')
        hash_b = self._hash(filename, 'HASH_B')
        for entry in self.hash_table:
            if (entry.hash_a == hash_a and entry.hash_b == hash_b):
                return entry