Wed, 03 Aug 2022 17:27:55 +0200
#201 - add mempool implementation
563 | 1 | /* |
2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | |
3 | * | |
4 | * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions are met: | |
8 | * | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE | |
20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
26 | * POSSIBILITY OF SUCH DAMAGE. | |
27 | */ | |
28 | /** | |
29 | * \file hash_key.h | |
30 | * \brief Interface for map implementations. | |
31 | * \author Mike Becker | |
32 | * \author Olaf Wintermann | |
33 | * \version 3.0 | |
34 | * \copyright 2-Clause BSD License | |
35 | */ | |
36 | ||
37 | ||
38 | #ifndef UCX_HASH_KEY_H | |
39 | #define UCX_HASH_KEY_H | |
40 | ||
41 | #include "stddef.h" | |
42 | ||
43 | #ifdef __cplusplus | |
44 | extern "C" { | |
45 | #endif | |
46 | ||
47 | /** Internal structure for a key within a hash map. */ | |
48 | struct cx_hash_key_s { | |
49 | /** The key data. */ | |
50 | union { | |
51 | unsigned char *bytes; | |
52 | unsigned char const *cbytes; | |
53 | char const *cstr; | |
54 | char *str; | |
55 | void *obj; | |
56 | } data; | |
57 | /** | |
58 | * The key data length. | |
59 | */ | |
60 | size_t len; | |
61 | /** The hash value of the key data. */ | |
62 | unsigned hash; | |
63 | }; | |
64 | ||
65 | /** | |
66 | * Type for a hash key. | |
67 | */ | |
68 | typedef struct cx_hash_key_s CxHashKey; | |
69 | ||
70 | /** | |
71 | * Computes a murmur hash-2. | |
72 | * | |
73 | * You need to initialize data and len in the key struct. | |
74 | * The hash is then directly written to that struct. | |
75 | * | |
76 | * @param key the key, the hash shall be computed for | |
77 | */ | |
78 | void cx_hash_murmur(CxHashKey *key); | |
79 | ||
80 | /** | |
81 | * Computes a hash key from a string. | |
82 | * | |
83 | * The string needs to be zero-terminated. | |
84 | * | |
85 | * @param str the string | |
86 | * @return the hash key | |
87 | */ | |
88 | __attribute__((__warn_unused_result__)) | |
89 | CxHashKey cx_hash_key_str(char const *str); | |
90 | ||
91 | /** | |
92 | * Computes a hash key from a byte array. | |
93 | * | |
94 | * @param bytes the array | |
95 | * @param len the length | |
96 | * @return the hash key | |
97 | */ | |
98 | __attribute__((__warn_unused_result__)) | |
99 | CxHashKey cx_hash_key_bytes( | |
100 | unsigned char const *bytes, | |
101 | size_t len | |
102 | ); | |
103 | ||
104 | /** | |
105 | * Computes a hash key for an arbitrary object. | |
106 | * | |
107 | * The computation uses the in-memory representation that might not be | |
108 | * the same on different platforms. Therefore, this hash should not be | |
109 | * used for data exchange with different machines. | |
110 | * | |
111 | * @param obj a pointer to an arbitrary object | |
112 | * @param len the length of object in memory | |
113 | * @return the hash key | |
114 | */ | |
115 | __attribute__((__warn_unused_result__)) | |
116 | CxHashKey cx_hash_key( | |
117 | void *obj, | |
118 | size_t len | |
119 | ); | |
120 | ||
121 | #ifdef __cplusplus | |
122 | } // extern "C" | |
123 | #endif | |
124 | ||
125 | #endif /* UCX_HASH_KEY_H */ |