Tue, 23 Jul 2024 14:29:33 +0200
fix request_auth not removing the trailing newline from the user name
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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 | #include "cx/hash_map.h" |
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30 | #include "cx/utils.h" |
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31 | |
750 | 32 | #include <string.h> |
33 | #include <assert.h> | |
34 | ||
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35 | struct cx_hash_map_element_s { |
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36 | /** A pointer to the next element in the current bucket. */ |
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37 | struct cx_hash_map_element_s *next; |
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38 | |
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39 | /** The corresponding key. */ |
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40 | CxHashKey key; |
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41 | |
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42 | /** The value data. */ |
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43 | char data[]; |
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44 | }; |
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45 | |
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46 | static void cx_hash_map_clear(struct cx_map_s *map) { |
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47 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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48 | cx_for_n(i, hash_map->bucket_count) { |
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49 | struct cx_hash_map_element_s *elem = hash_map->buckets[i]; |
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50 | if (elem != NULL) { |
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51 | do { |
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52 | struct cx_hash_map_element_s *next = elem->next; |
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53 | // invoke the destructor |
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54 | cx_invoke_destructor(map, elem->data); |
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55 | // free the key data |
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56 | cxFree(map->collection.allocator, (void *) elem->key.data); |
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57 | // free the node |
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58 | cxFree(map->collection.allocator, elem); |
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59 | // proceed |
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60 | elem = next; |
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61 | } while (elem != NULL); |
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62 | |
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63 | // do not leave a dangling pointer |
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64 | hash_map->buckets[i] = NULL; |
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65 | } |
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66 | } |
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67 | map->collection.size = 0; |
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68 | } |
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69 | |
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70 | static void cx_hash_map_destructor(struct cx_map_s *map) { |
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71 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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72 | |
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73 | // free the buckets |
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74 | cx_hash_map_clear(map); |
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75 | cxFree(map->collection.allocator, hash_map->buckets); |
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76 | |
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77 | // free the map structure |
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78 | cxFree(map->collection.allocator, map); |
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79 | } |
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80 | |
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81 | static int cx_hash_map_put( |
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82 | CxMap *map, |
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83 | CxHashKey key, |
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84 | void *value |
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85 | ) { |
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86 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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87 | CxAllocator const *allocator = map->collection.allocator; |
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88 | |
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89 | unsigned hash = key.hash; |
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90 | if (hash == 0) { |
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91 | cx_hash_murmur(&key); |
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92 | hash = key.hash; |
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93 | } |
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94 | |
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95 | size_t slot = hash % hash_map->bucket_count; |
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96 | struct cx_hash_map_element_s *elm = hash_map->buckets[slot]; |
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97 | struct cx_hash_map_element_s *prev = NULL; |
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98 | |
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99 | while (elm != NULL && elm->key.hash < hash) { |
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100 | prev = elm; |
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101 | elm = elm->next; |
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102 | } |
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103 | |
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104 | if (elm != NULL && elm->key.hash == hash && elm->key.len == key.len && |
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105 | memcmp(elm->key.data, key.data, key.len) == 0) { |
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106 | // overwrite existing element |
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107 | if (map->collection.store_pointer) { |
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108 | memcpy(elm->data, &value, sizeof(void *)); |
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109 | } else { |
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110 | memcpy(elm->data, value, map->collection.elem_size); |
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111 | } |
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112 | } else { |
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113 | // allocate new element |
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114 | struct cx_hash_map_element_s *e = cxMalloc( |
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115 | allocator, |
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116 | sizeof(struct cx_hash_map_element_s) + map->collection.elem_size |
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117 | ); |
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118 | if (e == NULL) { |
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119 | return -1; |
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120 | } |
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121 | |
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122 | // write the value |
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123 | if (map->collection.store_pointer) { |
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124 | memcpy(e->data, &value, sizeof(void *)); |
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125 | } else { |
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126 | memcpy(e->data, value, map->collection.elem_size); |
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127 | } |
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128 | |
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129 | // copy the key |
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130 | void *kd = cxMalloc(allocator, key.len); |
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131 | if (kd == NULL) { |
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132 | return -1; |
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133 | } |
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134 | memcpy(kd, key.data, key.len); |
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135 | e->key.data = kd; |
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136 | e->key.len = key.len; |
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137 | e->key.hash = hash; |
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138 | |
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139 | // insert the element into the linked list |
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140 | if (prev == NULL) { |
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141 | hash_map->buckets[slot] = e; |
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142 | } else { |
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143 | prev->next = e; |
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144 | } |
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145 | e->next = elm; |
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146 | |
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147 | // increase the size |
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148 | map->collection.size++; |
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149 | } |
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150 | |
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151 | return 0; |
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152 | } |
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153 | |
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154 | static void cx_hash_map_unlink( |
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155 | struct cx_hash_map_s *hash_map, |
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156 | size_t slot, |
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157 | struct cx_hash_map_element_s *prev, |
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158 | struct cx_hash_map_element_s *elm |
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159 | ) { |
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160 | // unlink |
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161 | if (prev == NULL) { |
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162 | hash_map->buckets[slot] = elm->next; |
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163 | } else { |
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164 | prev->next = elm->next; |
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165 | } |
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166 | // free element |
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167 | cxFree(hash_map->base.collection.allocator, (void *) elm->key.data); |
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168 | cxFree(hash_map->base.collection.allocator, elm); |
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169 | // decrease size |
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170 | hash_map->base.collection.size--; |
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171 | } |
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172 | |
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173 | /** |
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174 | * Helper function to avoid code duplication. |
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175 | * |
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176 | * @param map the map |
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177 | * @param key the key to look up |
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178 | * @param remove flag indicating whether the looked up entry shall be removed |
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179 | * @param destroy flag indicating whether the destructor shall be invoked |
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180 | * @return a pointer to the value corresponding to the key or \c NULL |
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181 | */ |
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182 | static void *cx_hash_map_get_remove( |
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183 | CxMap *map, |
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184 | CxHashKey key, |
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185 | bool remove, |
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186 | bool destroy |
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187 | ) { |
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188 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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189 | |
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190 | unsigned hash = key.hash; |
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191 | if (hash == 0) { |
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192 | cx_hash_murmur(&key); |
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193 | hash = key.hash; |
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194 | } |
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195 | |
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196 | size_t slot = hash % hash_map->bucket_count; |
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197 | struct cx_hash_map_element_s *elm = hash_map->buckets[slot]; |
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198 | struct cx_hash_map_element_s *prev = NULL; |
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199 | while (elm && elm->key.hash <= hash) { |
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200 | if (elm->key.hash == hash && elm->key.len == key.len) { |
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201 | if (memcmp(elm->key.data, key.data, key.len) == 0) { |
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202 | void *data = NULL; |
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203 | if (destroy) { |
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204 | cx_invoke_destructor(map, elm->data); |
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205 | } else { |
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206 | if (map->collection.store_pointer) { |
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207 | data = *(void **) elm->data; |
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208 | } else { |
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209 | data = elm->data; |
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210 | } |
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211 | } |
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212 | if (remove) { |
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213 | cx_hash_map_unlink(hash_map, slot, prev, elm); |
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214 | } |
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215 | return data; |
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216 | } |
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217 | } |
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218 | prev = elm; |
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219 | elm = prev->next; |
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220 | } |
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221 | |
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222 | return NULL; |
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223 | } |
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224 | |
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225 | static void *cx_hash_map_get( |
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226 | CxMap const *map, |
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227 | CxHashKey key |
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228 | ) { |
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229 | // we can safely cast, because we know the map stays untouched |
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230 | return cx_hash_map_get_remove((CxMap *) map, key, false, false); |
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231 | } |
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232 | |
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233 | static void *cx_hash_map_remove( |
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234 | CxMap *map, |
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235 | CxHashKey key, |
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236 | bool destroy |
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237 | ) { |
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238 | return cx_hash_map_get_remove(map, key, true, destroy); |
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239 | } |
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240 | |
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241 | static void *cx_hash_map_iter_current_entry(void const *it) { |
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242 | struct cx_iterator_s const *iter = it; |
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243 | // struct has to have a compatible signature |
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244 | return (struct cx_map_entry_s *) &(iter->kv_data); |
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245 | } |
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246 | |
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247 | static void *cx_hash_map_iter_current_key(void const *it) { |
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248 | struct cx_iterator_s const *iter = it; |
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249 | struct cx_hash_map_element_s *elm = iter->elem_handle; |
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250 | return &elm->key; |
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251 | } |
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252 | |
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253 | static void *cx_hash_map_iter_current_value(void const *it) { |
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254 | struct cx_iterator_s const *iter = it; |
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255 | struct cx_hash_map_s const *map = iter->src_handle.c; |
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256 | struct cx_hash_map_element_s *elm = iter->elem_handle; |
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257 | if (map->base.collection.store_pointer) { |
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258 | return *(void **) elm->data; |
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259 | } else { |
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260 | return elm->data; |
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261 | } |
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262 | } |
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263 | |
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264 | static bool cx_hash_map_iter_valid(void const *it) { |
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265 | struct cx_iterator_s const *iter = it; |
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266 | return iter->elem_handle != NULL; |
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267 | } |
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268 | |
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269 | static void cx_hash_map_iter_next(void *it) { |
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270 | struct cx_iterator_s *iter = it; |
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271 | struct cx_hash_map_element_s *elm = iter->elem_handle; |
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272 | struct cx_hash_map_s *map = iter->src_handle.m; |
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273 | |
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274 | // remove current element, if asked |
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275 | if (iter->base.remove) { |
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276 | |
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277 | // clear the flag |
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278 | iter->base.remove = false; |
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279 | |
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280 | // determine the next element |
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281 | struct cx_hash_map_element_s *next = elm->next; |
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282 | |
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283 | // search the previous element |
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284 | struct cx_hash_map_element_s *prev = NULL; |
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285 | if (map->buckets[iter->slot] != elm) { |
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286 | prev = map->buckets[iter->slot]; |
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287 | while (prev->next != elm) { |
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288 | prev = prev->next; |
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289 | } |
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290 | } |
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291 | |
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292 | // destroy |
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293 | cx_invoke_destructor((struct cx_map_s *) map, elm->data); |
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294 | |
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295 | // unlink |
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296 | cx_hash_map_unlink(map, iter->slot, prev, elm); |
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297 | |
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298 | // advance |
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299 | elm = next; |
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300 | } else { |
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301 | // just advance |
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302 | elm = elm->next; |
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303 | iter->index++; |
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304 | } |
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305 | |
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306 | // search the next bucket, if required |
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307 | while (elm == NULL && ++iter->slot < map->bucket_count) { |
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308 | elm = map->buckets[iter->slot]; |
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309 | } |
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310 | |
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311 | // fill the struct with the next element |
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312 | iter->elem_handle = elm; |
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313 | if (elm == NULL) { |
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314 | iter->kv_data.key = NULL; |
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315 | iter->kv_data.value = NULL; |
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316 | } else { |
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317 | iter->kv_data.key = &elm->key; |
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318 | if (map->base.collection.store_pointer) { |
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319 | iter->kv_data.value = *(void **) elm->data; |
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320 | } else { |
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321 | iter->kv_data.value = elm->data; |
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322 | } |
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323 | } |
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324 | } |
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325 | |
750 | 326 | static CxIterator cx_hash_map_iterator( |
327 | CxMap const *map, | |
328 | enum cx_map_iterator_type type | |
329 | ) { | |
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330 | CxIterator iter; |
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331 | |
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332 | iter.src_handle.c = map; |
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333 | iter.elem_count = map->collection.size; |
750 | 334 | |
335 | switch (type) { | |
336 | case CX_MAP_ITERATOR_PAIRS: | |
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337 | iter.elem_size = sizeof(CxMapEntry); |
750 | 338 | iter.base.current = cx_hash_map_iter_current_entry; |
339 | break; | |
340 | case CX_MAP_ITERATOR_KEYS: | |
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341 | iter.elem_size = sizeof(CxHashKey); |
750 | 342 | iter.base.current = cx_hash_map_iter_current_key; |
343 | break; | |
344 | case CX_MAP_ITERATOR_VALUES: | |
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345 | iter.elem_size = map->collection.elem_size; |
750 | 346 | iter.base.current = cx_hash_map_iter_current_value; |
347 | break; | |
348 | default: | |
349 | assert(false); | |
350 | } | |
351 | ||
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352 | iter.base.valid = cx_hash_map_iter_valid; |
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353 | iter.base.next = cx_hash_map_iter_next; |
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354 | iter.base.remove = false; |
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355 | iter.base.mutating = false; |
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356 | |
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357 | iter.slot = 0; |
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358 | iter.index = 0; |
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359 | |
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360 | if (map->collection.size > 0) { |
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361 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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362 | struct cx_hash_map_element_s *elm = hash_map->buckets[0]; |
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363 | while (elm == NULL) { |
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364 | elm = hash_map->buckets[++iter.slot]; |
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365 | } |
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366 | iter.elem_handle = elm; |
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367 | iter.kv_data.key = &elm->key; |
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368 | if (map->collection.store_pointer) { |
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369 | iter.kv_data.value = *(void **) elm->data; |
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370 | } else { |
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371 | iter.kv_data.value = elm->data; |
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372 | } |
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373 | } else { |
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374 | iter.elem_handle = NULL; |
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375 | iter.kv_data.key = NULL; |
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376 | iter.kv_data.value = NULL; |
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377 | } |
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378 | |
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379 | return iter; |
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380 | } |
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381 | |
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382 | static cx_map_class cx_hash_map_class = { |
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383 | cx_hash_map_destructor, |
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384 | cx_hash_map_clear, |
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385 | cx_hash_map_put, |
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386 | cx_hash_map_get, |
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387 | cx_hash_map_remove, |
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388 | cx_hash_map_iterator, |
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389 | }; |
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390 | |
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391 | CxMap *cxHashMapCreate( |
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392 | CxAllocator const *allocator, |
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393 | size_t itemsize, |
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394 | size_t buckets |
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395 | ) { |
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396 | if (buckets == 0) { |
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397 | // implementation defined default |
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398 | buckets = 16; |
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399 | } |
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400 | |
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401 | struct cx_hash_map_s *map = cxCalloc(allocator, 1, |
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402 | sizeof(struct cx_hash_map_s)); |
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403 | if (map == NULL) return NULL; |
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404 | |
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405 | // initialize hash map members |
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406 | map->bucket_count = buckets; |
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407 | map->buckets = cxCalloc(allocator, buckets, |
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408 | sizeof(struct cx_hash_map_element_s *)); |
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409 | if (map->buckets == NULL) { |
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410 | cxFree(allocator, map); |
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411 | return NULL; |
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412 | } |
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413 | |
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414 | // initialize base members |
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415 | map->base.cl = &cx_hash_map_class; |
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416 | map->base.collection.allocator = allocator; |
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417 | |
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418 | if (itemsize > 0) { |
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419 | map->base.collection.store_pointer = false; |
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420 | map->base.collection.elem_size = itemsize; |
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421 | } else { |
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422 | map->base.collection.store_pointer = true; |
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423 | map->base.collection.elem_size = sizeof(void *); |
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424 | } |
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425 | |
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426 | return (CxMap *) map; |
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427 | } |
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428 | |
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429 | int cxMapRehash(CxMap *map) { |
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430 | struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map; |
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431 | if (map->collection.size > ((hash_map->bucket_count * 3) >> 2)) { |
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432 | |
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433 | size_t new_bucket_count = (map->collection.size * 5) >> 1; |
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434 | struct cx_hash_map_element_s **new_buckets = cxCalloc( |
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435 | map->collection.allocator, |
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436 | new_bucket_count, sizeof(struct cx_hash_map_element_s *) |
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437 | ); |
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438 | |
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439 | if (new_buckets == NULL) { |
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440 | return 1; |
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441 | } |
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442 | |
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443 | // iterate through the elements and assign them to their new slots |
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444 | cx_for_n(slot, hash_map->bucket_count) { |
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445 | struct cx_hash_map_element_s *elm = hash_map->buckets[slot]; |
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446 | while (elm != NULL) { |
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447 | struct cx_hash_map_element_s *next = elm->next; |
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448 | size_t new_slot = elm->key.hash % new_bucket_count; |
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449 | |
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450 | // find position where to insert |
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451 | struct cx_hash_map_element_s *bucket_next = new_buckets[new_slot]; |
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452 | struct cx_hash_map_element_s *bucket_prev = NULL; |
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453 | while (bucket_next != NULL && |
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454 | bucket_next->key.hash < elm->key.hash) { |
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455 | bucket_prev = bucket_next; |
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456 | bucket_next = bucket_next->next; |
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457 | } |
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458 | |
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459 | // insert |
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460 | if (bucket_prev == NULL) { |
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461 | elm->next = new_buckets[new_slot]; |
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462 | new_buckets[new_slot] = elm; |
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463 | } else { |
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464 | bucket_prev->next = elm; |
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465 | elm->next = bucket_next; |
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466 | } |
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467 | |
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468 | // advance |
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469 | elm = next; |
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470 | } |
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471 | } |
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472 | |
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473 | // assign result to the map |
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474 | hash_map->bucket_count = new_bucket_count; |
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475 | cxFree(map->collection.allocator, hash_map->buckets); |
747
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476 | hash_map->buckets = new_buckets; |
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477 | } |
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478 | return 0; |
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479 | } |