memcached_generate_hash_value - Man Page
Name
memcached_generate_hash_value — Generating hash values directly
Hash a key value
Synopsis
- #include <libmemcached/memcached.h>
Compile and link with -lmemcachedutil -lmemcached
- uint32_t memcached_generate_hash_value(const char *key, size_t key_length, memcached_hash_t hash_algorithm)
- Parameters
- key -- the key to generate a hash of
- key_length -- the length of the key without any terminating zero
- hash_algorithm -- memcached_hash_t, the algorithm to use
- Returns
a 32 bit hash value
- uint32_t memcached_generate_hash(memcached_st *ptr, const char *key, size_t key_length)
- Parameters
- ptr -- pointer to an initialized memcached_st struct
- key -- the key to generate a hash of
- key_length -- the length of the key without any terminating zero
- Returns
a 32 bit hash value
typedef enum memcached_hash_t memcached_hash_t
- enum memcached_hash_t
enumerator MEMCACHED_HASH_DEFAULT
enumerator MEMCACHED_HASH_MD5
enumerator MEMCACHED_HASH_CRC
enumerator MEMCACHED_HASH_FNV1_64
enumerator MEMCACHED_HASH_FNV1A_64
enumerator MEMCACHED_HASH_FNV1_32
enumerator MEMCACHED_HASH_FNV1A_32
enumerator MEMCACHED_HASH_HSIEH
enumerator MEMCACHED_HASH_MURMUR
enumerator MEMCACHED_HASH_JENKINS
enumerator MEMCACHED_HASH_MURMUR3
enumerator MEMCACHED_HASH_CUSTOM
Description
memcached_generate_hash_value() allows you to hash a key using one of the hash functions defined in the library. This method is provided for the convenience of higher-level language bindings and is not necessary for normal memcache operations.
Support for MEMCACHED_HASH_HSIEH is a compile time option that is disabled by default. To enable tests for this hashing algorithm, configure and build libmemcached with the Hsieh hash enabled.
memcached_generate_hash() takes a memcached_st structure and produces the hash value that would have been generated based on the defaults of memcached_st.
As of version 0.36 all hash methods have been placed into the library libhashkit(3) which is linked with libmemcached(3). For more information please see its documentation.
Return Value
A 32-bit integer which is the result of hashing the given key. For 64-bit hash algorithms, only the least-significant 32 bits are returned.