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30 * \brief Interface for map implementations.
32 * \author Olaf Wintermann
34 * \copyright 2-Clause BSD License
38 #ifndef UCX_HASH_KEY_H
39 #define UCX_HASH_KEY_H
47 /** Internal structure for a key within a hash map. */
48 struct cx_hash_key_s {
52 * The key data length.
55 /** The hash value of the key data. */
60 * Type for a hash key.
62 typedef struct cx_hash_key_s CxHashKey;
65 * Computes a murmur2 32 bit hash.
67 * You need to initialize \c data and \c len in the key struct.
68 * The hash is then directly written to that struct.
70 * \note If \c data is \c NULL, the hash is defined as 1574210520.
72 * @param key the key, the hash shall be computed for
74 void cx_hash_murmur(CxHashKey *key);
77 * Computes a hash key from a string.
79 * The string needs to be zero-terminated.
81 * @param str the string
82 * @return the hash key
84 __attribute__((__warn_unused_result__))
85 CxHashKey cx_hash_key_str(char const *str);
88 * Computes a hash key from a byte array.
90 * @param bytes the array
91 * @param len the length
92 * @return the hash key
94 __attribute__((__warn_unused_result__))
95 CxHashKey cx_hash_key_bytes(
96 unsigned char const *bytes,
101 * Computes a hash key for an arbitrary object.
103 * The computation uses the in-memory representation that might not be
104 * the same on different platforms. Therefore, this hash should not be
105 * used for data exchange with different machines.
107 * @param obj a pointer to an arbitrary object
108 * @param len the length of object in memory
109 * @return the hash key
111 __attribute__((__warn_unused_result__))
112 CxHashKey cx_hash_key(
118 * Computes a hash key from a UCX string.
120 * @param str the string
121 * @return the hash key
123 #define cx_hash_key_cxstr(str) cx_hash_key((void*)(str).ptr, (str).length)
129 #endif // UCX_HASH_KEY_H