Sun, 22 Dec 2024 23:10:07 +0100
make cx_strcast() also support cxstring
also makes the solution for issue #536 a lot nicer
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 | * \copyright 2-Clause BSD License | |
34 | */ | |
35 | ||
36 | ||
37 | #ifndef UCX_HASH_KEY_H | |
38 | #define UCX_HASH_KEY_H | |
39 | ||
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40 | #include "common.h" |
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41 | #include "string.h" |
563 | 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. */ | |
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50 | const void *data; |
563 | 51 | /** |
52 | * The key data length. | |
53 | */ | |
54 | size_t len; | |
55 | /** The hash value of the key data. */ | |
56 | unsigned hash; | |
57 | }; | |
58 | ||
59 | /** | |
60 | * Type for a hash key. | |
61 | */ | |
62 | typedef struct cx_hash_key_s CxHashKey; | |
63 | ||
64 | /** | |
604 | 65 | * Computes a murmur2 32 bit hash. |
563 | 66 | * |
604 | 67 | * You need to initialize \c data and \c len in the key struct. |
563 | 68 | * The hash is then directly written to that struct. |
69 | * | |
604 | 70 | * \note If \c data is \c NULL, the hash is defined as 1574210520. |
71 | * | |
563 | 72 | * @param key the key, the hash shall be computed for |
73 | */ | |
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74 | cx_attr_nonnull |
563 | 75 | void cx_hash_murmur(CxHashKey *key); |
76 | ||
77 | /** | |
78 | * Computes a hash key from a string. | |
79 | * | |
80 | * The string needs to be zero-terminated. | |
81 | * | |
82 | * @param str the string | |
83 | * @return the hash key | |
84 | */ | |
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85 | cx_attr_nodiscard |
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86 | cx_attr_cstr_arg(1) |
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87 | CxHashKey cx_hash_key_str(const char *str); |
563 | 88 | |
89 | /** | |
90 | * Computes a hash key from a byte array. | |
91 | * | |
92 | * @param bytes the array | |
93 | * @param len the length | |
94 | * @return the hash key | |
95 | */ | |
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96 | cx_attr_nodiscard |
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97 | cx_attr_access_r(1, 2) |
563 | 98 | CxHashKey cx_hash_key_bytes( |
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99 | const unsigned char *bytes, |
563 | 100 | size_t len |
101 | ); | |
102 | ||
103 | /** | |
104 | * Computes a hash key for an arbitrary object. | |
105 | * | |
106 | * The computation uses the in-memory representation that might not be | |
107 | * the same on different platforms. Therefore, this hash should not be | |
108 | * used for data exchange with different machines. | |
109 | * | |
110 | * @param obj a pointer to an arbitrary object | |
111 | * @param len the length of object in memory | |
112 | * @return the hash key | |
113 | */ | |
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114 | cx_attr_nodiscard |
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115 | cx_attr_access_r(1, 2) |
563 | 116 | CxHashKey cx_hash_key( |
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117 | const void *obj, |
563 | 118 | size_t len |
119 | ); | |
120 | ||
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121 | /** |
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122 | * Computes a hash key from a UCX string. |
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123 | * |
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124 | * @param str the string |
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125 | * @return the hash key |
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126 | */ |
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127 | cx_attr_nodiscard |
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128 | static inline CxHashKey cx_hash_key_cxstr(cxstring str) { |
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129 | return cx_hash_key(str.ptr, str.length); |
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130 | } |
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Mike Becker <universe@uap-core.de>
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131 | |
415bf2ce6bab
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Mike Becker <universe@uap-core.de>
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132 | /** |
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133 | * Computes a hash key from a UCX string. |
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134 | * |
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135 | * @param str the string |
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Mike Becker <universe@uap-core.de>
parents:
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136 | * @return the hash key |
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137 | */ |
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138 | #define cx_hash_key_cxstr(str) cx_hash_key_cxstr(cx_strcast(str)) |
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139 | |
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140 | #ifdef __cplusplus |
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141 | } // extern "C" |
563 | 142 | #endif |
143 | ||
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144 | #endif // UCX_HASH_KEY_H |