void md5_signature(unsigned char *key, unsigned int length, unsigned char *result);
uint32_t hash_crc32(const char *data,
size_t data_len);
+uint32_t hsieh_hash(char *key, size_t key_length);
memcached_return memcached_connect(memcached_st *ptr, unsigned int server_key);
memcached_return memcached_response(memcached_st *ptr,