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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 | * \version 3.0 |
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34 | * \copyright 2-Clause BSD License |
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35 | */ |
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36 | |
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37 | |
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38 | #ifndef UCX_HASH_KEY_H |
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39 | #define UCX_HASH_KEY_H |
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40 | |
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41 | #include "stddef.h" |
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42 | |
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43 | #ifdef __cplusplus |
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44 | extern "C" { |
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45 | #endif |
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46 | |
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47 | /** Internal structure for a key within a hash map. */ |
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48 | struct cx_hash_key_s { |
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49 | /** The key data. */ |
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50 | union { |
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51 | unsigned char *bytes; |
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52 | unsigned char const *cbytes; |
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53 | char const *cstr; |
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54 | char *str; |
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55 | void *obj; |
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56 | } data; |
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57 | /** |
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58 | * The key data length. |
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59 | */ |
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60 | size_t len; |
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61 | /** The hash value of the key data. */ |
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62 | unsigned hash; |
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63 | }; |
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64 | |
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65 | /** |
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66 | * Type for a hash key. |
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67 | */ |
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68 | typedef struct cx_hash_key_s CxHashKey; |
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69 | |
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70 | /** |
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71 | * Computes a murmur hash-2. |
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72 | * |
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73 | * You need to initialize data and len in the key struct. |
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74 | * The hash is then directly written to that struct. |
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75 | * |
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76 | * @param key the key, the hash shall be computed for |
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77 | */ |
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78 | void cx_hash_murmur(CxHashKey *key); |
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79 | |
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80 | /** |
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81 | * Computes a hash key from a string. |
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82 | * |
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83 | * The string needs to be zero-terminated. |
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84 | * |
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85 | * @param str the string |
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86 | * @return the hash key |
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87 | */ |
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88 | __attribute__((__warn_unused_result__)) |
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89 | CxHashKey cx_hash_key_str(char const *str); |
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90 | |
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91 | /** |
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92 | * Computes a hash key from a byte array. |
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93 | * |
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94 | * @param bytes the array |
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95 | * @param len the length |
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96 | * @return the hash key |
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97 | */ |
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98 | __attribute__((__warn_unused_result__)) |
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99 | CxHashKey cx_hash_key_bytes( |
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100 | unsigned char const *bytes, |
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101 | size_t len |
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102 | ); |
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103 | |
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104 | /** |
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105 | * Computes a hash key for an arbitrary object. |
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106 | * |
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107 | * The computation uses the in-memory representation that might not be |
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108 | * the same on different platforms. Therefore, this hash should not be |
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109 | * used for data exchange with different machines. |
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110 | * |
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111 | * @param obj a pointer to an arbitrary object |
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112 | * @param len the length of object in memory |
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113 | * @return the hash key |
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114 | */ |
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115 | __attribute__((__warn_unused_result__)) |
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116 | CxHashKey cx_hash_key( |
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117 | void *obj, |
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118 | size_t len |
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119 | ); |
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120 | |
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121 | #ifdef __cplusplus |
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122 | } // extern "C" |
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123 | #endif |
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124 | |
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125 | #endif /* UCX_HASH_KEY_H */ |