src/hash_map.c

Sun, 20 Nov 2022 16:58:51 +0100

author
Mike Becker <universe@uap-core.de>
date
Sun, 20 Nov 2022 16:58:51 +0100
changeset 623
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parent 575
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child 630
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permissions
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#219 array list: implement reverse

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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 <string.h>
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30 #include "cx/hash_map.h"
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31 #include "cx/utils.h"
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32
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33 static void cx_hash_map_clear(struct cx_map_s *map) {
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34 struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map;
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35 cx_for_n(i, hash_map->bucket_count) {
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36 struct cx_hash_map_element_s *elem = hash_map->buckets[i];
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37 if (elem != NULL) {
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38 do {
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39 struct cx_hash_map_element_s *next = elem->next;
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40 // free the key data
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41 cxFree(map->allocator, elem->key.data.obj);
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42 // free the node
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43 cxFree(map->allocator, elem);
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44 // proceed
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45 elem = next;
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46 } while (elem != NULL);
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47
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48 // do not leave a dangling pointer
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49 hash_map->buckets[i] = NULL;
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50 }
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51 }
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52 map->size = 0;
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53 }
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54
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55 static void cx_hash_map_destructor(struct cx_map_s *map) {
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56 struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map;
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57
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58 // free the buckets
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59 cx_hash_map_clear(map);
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60 cxFree(map->allocator, hash_map->buckets);
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61
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62 // free the map structure
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63 cxFree(map->allocator, map);
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64 }
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65
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66 static int cx_hash_map_put(
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67 CxMap *map,
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68 CxHashKey key,
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69 void *value
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70 ) {
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71 struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map;
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72 CxAllocator *allocator = map->allocator;
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73
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74 unsigned hash = key.hash;
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75 if (hash == 0) {
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76 cx_hash_murmur(&key);
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77 hash = key.hash;
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78 }
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79
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80 size_t slot = hash % hash_map->bucket_count;
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81 struct cx_hash_map_element_s *elm = hash_map->buckets[slot];
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82 struct cx_hash_map_element_s *prev = NULL;
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83
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84 while (elm != NULL && elm->key.hash < hash) {
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85 prev = elm;
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86 elm = elm->next;
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87 }
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88
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89 if (elm != NULL && elm->key.hash == hash && elm->key.len == key.len &&
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90 memcmp(elm->key.data.obj, key.data.obj, key.len) == 0) {
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91 // overwrite existing element
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92 elm->data = value;
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93 } else {
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94 // allocate new element
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95 struct cx_hash_map_element_s *e = cxMalloc(allocator, sizeof(struct cx_hash_map_element_s));
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96 if (e == NULL) {
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97 return -1;
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98 }
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99
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100 // write the value
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101 // TODO: depending on future map features, we may want to copy here
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102 e->data = value;
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103
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104 // copy the key
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105 void *kd = cxMalloc(allocator, key.len);
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106 if (kd == NULL) {
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107 return -1;
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108 }
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109 memcpy(kd, key.data.obj, key.len);
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110 e->key.data.obj = kd;
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111 e->key.len = key.len;
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112 e->key.hash = hash;
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113
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114 // insert the element into the linked list
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115 if (prev == NULL) {
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116 hash_map->buckets[slot] = e;
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117 } else {
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118 prev->next = e;
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119 }
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120 e->next = elm;
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121
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122 // increase the size
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123 map->size++;
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124 }
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125
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126 return 0;
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127 }
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128
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129 static void cx_hash_map_unlink(
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130 struct cx_hash_map_s *hash_map,
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131 size_t slot,
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132 struct cx_hash_map_element_s *prev,
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133 struct cx_hash_map_element_s *elm
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134 ) {
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135 // unlink
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136 if (prev == NULL) {
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137 hash_map->buckets[slot] = elm->next;
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138 } else {
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139 prev->next = elm->next;
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140 }
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141 // free element
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142 cxFree(hash_map->base.allocator, elm->key.data.obj);
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143 cxFree(hash_map->base.allocator, elm);
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144 // decrease size
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145 hash_map->base.size--;
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146 }
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147
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148 /**
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149 * Helper function to avoid code duplication.
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150 *
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151 * @param map the map
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152 * @param key the key to look up
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153 * @param remove flag indicating whether the looked up entry shall be removed
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154 * @return the value corresponding to the key or \c NULL
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155 */
550
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156 static void *cx_hash_map_get_remove(
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157 CxMap *map,
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158 CxHashKey key,
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159 bool remove
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160 ) {
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161 struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map;
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162
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163 unsigned hash = key.hash;
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164 if (hash == 0) {
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165 cx_hash_murmur(&key);
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166 hash = key.hash;
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167 }
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168
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169 size_t slot = hash % hash_map->bucket_count;
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170 struct cx_hash_map_element_s *elm = hash_map->buckets[slot];
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171 struct cx_hash_map_element_s *prev = NULL;
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172 while (elm && elm->key.hash <= hash) {
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173 if (elm->key.hash == hash && elm->key.len == key.len) {
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174 if (memcmp(elm->key.data.obj, key.data.obj, key.len) == 0) {
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175 void *data = elm->data;
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176 if (remove) {
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177 cx_hash_map_unlink(hash_map, slot, prev, elm);
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178 }
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179 return data;
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180 }
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181 }
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182 prev = elm;
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183 elm = prev->next;
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184 }
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185
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186 return NULL;
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187 }
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188
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189 static void *cx_hash_map_get(
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190 CxMap const *map,
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191 CxHashKey key
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192 ) {
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193 // we can safely cast, because we know when remove=false, the map stays untouched
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194 return cx_hash_map_get_remove((CxMap *) map, key, false);
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195 }
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196
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197 static void *cx_hash_map_remove(
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198 CxMap *map,
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199 CxHashKey key
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200 ) {
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201 return cx_hash_map_get_remove(map, key, true);
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202 }
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203
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204 static void *cx_hash_map_iter_current_entry(CxIterator const *iter) {
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205 // struct has to have a compatible signature
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206 return (struct cx_map_entry_s *) &(iter->kv_data);
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207 }
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208
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209 static void *cx_hash_map_iter_current_key(CxIterator const *iter) {
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210 struct cx_hash_map_element_s *elm = iter->elem_handle;
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211 return &elm->key;
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212 }
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213
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214 static void *cx_hash_map_iter_current_value(CxIterator const *iter) {
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215 struct cx_hash_map_element_s *elm = iter->elem_handle;
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216 // TODO: return a pointer to data if this map is storing copies
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217 return elm->data;
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218 }
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219
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220 static bool cx_hash_map_iter_valid(CxIterator const *iter) {
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221 return iter->elem_handle != NULL;
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222 }
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223
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224 static void cx_hash_map_iter_next(CxIterator *iter) {
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225 struct cx_hash_map_s *map = iter->src_handle;
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226 struct cx_hash_map_element_s *elm = iter->elem_handle;
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227
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228 // remove current element, if asked
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229 if (iter->remove) {
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230 // clear the flag
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231 iter->remove = false;
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232
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233 // determine the next element
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234 struct cx_hash_map_element_s *next = elm->next;
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235
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236 // search the previous element
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237 struct cx_hash_map_element_s *prev = NULL;
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238 if (map->buckets[iter->slot] != elm) {
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239 prev = map->buckets[iter->slot];
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240 while (prev->next != elm) {
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241 prev = prev->next;
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242 }
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243 }
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244
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245 // unlink
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246 cx_hash_map_unlink(map, iter->slot, prev, elm);
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247
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248 // advance
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249 elm = next;
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250 } else {
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251 // just advance
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252 elm = elm->next;
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253 iter->index++;
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254 }
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255
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256 // search the next bucket, if required
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257 while (elm == NULL && ++iter->slot < map->bucket_count) {
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258 elm = map->buckets[iter->slot];
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259 }
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260
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261 // fill the struct with the next element
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262 iter->elem_handle = elm;
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263 if (elm == NULL) {
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264 iter->kv_data.key = NULL;
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265 iter->kv_data.value = NULL;
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266 } else {
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267 iter->kv_data.key = &elm->key;
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268 // TODO: pointer to data if this map is storing copies
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269 iter->kv_data.value = elm->data;
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270 }
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271 }
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272
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273 static CxIterator cx_hash_map_iterator(CxMap *map) {
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274 CxIterator iter;
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275
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276 iter.src_handle = map;
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277 iter.valid = cx_hash_map_iter_valid;
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278 iter.next = cx_hash_map_iter_next;
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279 iter.current = cx_hash_map_iter_current_entry;
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280
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281 iter.slot = 0;
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282 iter.index = 0;
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283 iter.remove = false;
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284
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285 if (map->size > 0) {
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286 struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map;
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287 struct cx_hash_map_element_s *elm = hash_map->buckets[0];
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288 for (; elm == NULL; iter.slot++) {
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289 elm = hash_map->buckets[iter.slot];
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290 }
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291 iter.elem_handle = elm;
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292 iter.kv_data.key = &elm->key;
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293 // TODO: pointer to data if this map is storing copies
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294 iter.kv_data.value = elm->data;
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295 } else {
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296 iter.elem_handle = NULL;
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297 iter.kv_data.key = NULL;
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298 iter.kv_data.value = NULL;
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299 }
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300
550
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301 return iter;
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302 }
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303
551
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304 static CxIterator cx_hash_map_iterator_keys(CxMap *map) {
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305 CxIterator iter = cx_hash_map_iterator(map);
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306 iter.current = cx_hash_map_iter_current_key;
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307 return iter;
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308 }
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309
551
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310 static CxIterator cx_hash_map_iterator_values(CxMap *map) {
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311 CxIterator iter = cx_hash_map_iterator(map);
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312 iter.current = cx_hash_map_iter_current_value;
550
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313 return iter;
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314 }
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315
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316 static cx_map_class cx_hash_map_class = {
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317 cx_hash_map_destructor,
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318 cx_hash_map_clear,
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319 cx_hash_map_put,
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320 cx_hash_map_get,
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321 cx_hash_map_remove,
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322 cx_hash_map_iterator,
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323 cx_hash_map_iterator_keys,
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324 cx_hash_map_iterator_values,
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325 };
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326
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327 CxMap *cxHashMapCreate(
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328 CxAllocator *allocator,
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329 size_t buckets
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330 ) {
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331 if (buckets == 0) {
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332 // implementation defined default
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333 buckets = 16;
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334 }
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335
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336 struct cx_hash_map_s *map = cxMalloc(allocator, sizeof(struct cx_hash_map_s));
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337 if (map == NULL) return NULL;
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338
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339 // initialize hash map members
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340 map->bucket_count = buckets;
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341 map->buckets = cxCalloc(allocator, buckets, sizeof(struct cx_hash_map_element_s *));
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342 if (map->buckets == NULL) {
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343 cxFree(allocator, map);
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344 return NULL;
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345 }
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346
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347 // initialize base members
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348 map->base.cl = &cx_hash_map_class;
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349 map->base.allocator = allocator;
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350 map->base.size = 0;
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351
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352 return (CxMap *) map;
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353 }
562
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354
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355 int cxMapRehash(CxMap *map) {
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356 struct cx_hash_map_s *hash_map = (struct cx_hash_map_s *) map;
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357 if (map->size > ((hash_map->bucket_count * 3) >> 2)) {
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358
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359 size_t new_bucket_count = (map->size * 5) >> 1;
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360 struct cx_hash_map_element_s **new_buckets = cxCalloc(map->allocator,
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361 new_bucket_count, sizeof(struct cx_hash_map_element_s *));
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362
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363 if (new_buckets == NULL) {
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364 return 1;
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365 }
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366
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367 // iterate through the elements and assign them to their new slots
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368 cx_for_n(slot, hash_map->bucket_count) {
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369 struct cx_hash_map_element_s *elm = hash_map->buckets[slot];
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370 while (elm != NULL) {
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371 struct cx_hash_map_element_s *next = elm->next;
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372 size_t new_slot = elm->key.hash % new_bucket_count;
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373
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374 // find position where to insert
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375 struct cx_hash_map_element_s *bucket_next = new_buckets[new_slot];
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376 struct cx_hash_map_element_s *bucket_prev = NULL;
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377 while (bucket_next != NULL && bucket_next->key.hash < elm->key.hash) {
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378 bucket_prev = bucket_next;
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379 bucket_next = bucket_next->next;
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380 }
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381
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382 // insert
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383 if (bucket_prev == NULL) {
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384 elm->next = new_buckets[new_slot];
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385 new_buckets[new_slot] = elm;
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386 } else {
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387 bucket_prev->next = elm;
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388 elm->next = bucket_next;
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389 }
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390
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391 // advance
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392 elm = next;
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393 }
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394 }
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395
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396 // assign result to the map
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397 hash_map->bucket_count = new_bucket_count;
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398 cxFree(map->allocator, hash_map->buckets);
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399 hash_map->buckets = new_buckets;
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400 }
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401 return 0;
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402 }

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