src/cx/hash_key.h

Sat, 17 Feb 2024 20:51:27 +0100

author
Mike Becker <universe@uap-core.de>
date
Sat, 17 Feb 2024 20:51:27 +0100
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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28 /**
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29 * \file hash_key.h
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30 * \brief Interface for map implementations.
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31 * \author Mike Becker
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32 * \author Olaf Wintermann
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33 * \copyright 2-Clause BSD License
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34 */
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35
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36
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37 #ifndef UCX_HASH_KEY_H
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38 #define UCX_HASH_KEY_H
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39
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40 #include "common.h"
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41
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42 #ifdef __cplusplus
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43 extern "C" {
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44 #endif
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45
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46 /** Internal structure for a key within a hash map. */
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47 struct cx_hash_key_s {
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48 /** The key data. */
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49 void const *data;
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50 /**
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51 * The key data length.
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52 */
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53 size_t len;
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54 /** The hash value of the key data. */
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55 unsigned hash;
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56 };
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57
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58 /**
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59 * Type for a hash key.
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60 */
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61 typedef struct cx_hash_key_s CxHashKey;
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62
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63 /**
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64 * Computes a murmur2 32 bit hash.
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65 *
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66 * You need to initialize \c data and \c len in the key struct.
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67 * The hash is then directly written to that struct.
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68 *
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69 * \note If \c data is \c NULL, the hash is defined as 1574210520.
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70 *
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71 * @param key the key, the hash shall be computed for
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72 */
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73 void cx_hash_murmur(CxHashKey *key);
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74
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75 /**
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76 * Computes a hash key from a string.
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77 *
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78 * The string needs to be zero-terminated.
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79 *
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80 * @param str the string
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81 * @return the hash key
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82 */
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83 __attribute__((__warn_unused_result__))
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84 CxHashKey cx_hash_key_str(char const *str);
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85
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86 /**
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87 * Computes a hash key from a byte array.
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88 *
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89 * @param bytes the array
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90 * @param len the length
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91 * @return the hash key
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92 */
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93 __attribute__((__warn_unused_result__))
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94 CxHashKey cx_hash_key_bytes(
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95 unsigned char const *bytes,
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96 size_t len
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97 );
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98
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99 /**
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100 * Computes a hash key for an arbitrary object.
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101 *
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102 * The computation uses the in-memory representation that might not be
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103 * the same on different platforms. Therefore, this hash should not be
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104 * used for data exchange with different machines.
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105 *
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106 * @param obj a pointer to an arbitrary object
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107 * @param len the length of object in memory
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108 * @return the hash key
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109 */
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110 __attribute__((__warn_unused_result__))
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111 CxHashKey cx_hash_key(
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112 void const *obj,
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113 size_t len
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114 );
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115
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116 /**
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117 * Computes a hash key from a UCX string.
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118 *
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119 * @param str the string
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120 * @return the hash key
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121 */
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122 #define cx_hash_key_cxstr(str) cx_hash_key((void*)(str).ptr, (str).length)
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123
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124 #ifdef __cplusplus
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125 } // extern "C"
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126 #endif
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127
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128 #endif // UCX_HASH_KEY_H

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