ucx/map.c

Sun, 15 Dec 2019 17:57:15 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sun, 15 Dec 2019 17:57:15 +0100
changeset 706
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parent 505
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permissions
-rw-r--r--

fix documentation index page

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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 2017 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 "ucx/map.h"
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30
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31 #include <stdlib.h>
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32 #include <string.h>
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33
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34 UcxMap *ucx_map_new(size_t size) {
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35 return ucx_map_new_a(NULL, size);
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36 }
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37
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38 UcxMap *ucx_map_new_a(UcxAllocator *allocator, size_t size) {
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39 if(size == 0) {
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40 size = 16;
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41 }
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43 if(!allocator) {
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44 allocator = ucx_default_allocator();
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45 }
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46
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47 UcxMap *map = (UcxMap*)almalloc(allocator, sizeof(UcxMap));
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48 if (!map) {
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49 return NULL;
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50 }
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51
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52 map->allocator = allocator;
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53 map->map = (UcxMapElement**)alcalloc(
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54 allocator, size, sizeof(UcxMapElement*));
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55 if(map->map == NULL) {
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56 alfree(allocator, map);
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57 return NULL;
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58 }
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59 map->size = size;
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60 map->count = 0;
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61
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62 return map;
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63 }
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64
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65 static void ucx_map_free_elmlist_contents(UcxMap *map) {
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66 for (size_t n = 0 ; n < map->size ; n++) {
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67 UcxMapElement *elem = map->map[n];
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68 if (elem != NULL) {
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69 do {
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70 UcxMapElement *next = elem->next;
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71 alfree(map->allocator, elem->key.data);
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72 alfree(map->allocator, elem);
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73 elem = next;
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74 } while (elem != NULL);
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75 }
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76 }
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77 }
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78
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79 void ucx_map_free(UcxMap *map) {
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80 ucx_map_free_elmlist_contents(map);
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81 alfree(map->allocator, map->map);
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82 alfree(map->allocator, map);
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83 }
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84
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85 void ucx_map_free_content(UcxMap *map, ucx_destructor destr) {
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86 UcxMapIterator iter = ucx_map_iterator(map);
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87 void *val;
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88 UCX_MAP_FOREACH(key, val, iter) {
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89 if (destr) {
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90 destr(val);
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91 } else {
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92 alfree(map->allocator, val);
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93 }
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94 }
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95 }
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96
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97 void ucx_map_clear(UcxMap *map) {
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98 if (map->count == 0) {
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99 return; // nothing to do
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100 }
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101 ucx_map_free_elmlist_contents(map);
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102 memset(map->map, 0, map->size*sizeof(UcxMapElement*));
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103 map->count = 0;
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104 }
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105
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106 int ucx_map_copy(UcxMap *from, UcxMap *to, copy_func fnc, void *data) {
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107 UcxMapIterator i = ucx_map_iterator(from);
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108 void *value;
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109 UCX_MAP_FOREACH(key, value, i) {
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110 if (ucx_map_put(to, key, fnc ? fnc(value, data) : value)) {
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111 return 1;
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112 }
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113 }
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114 return 0;
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115 }
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116
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117 UcxMap *ucx_map_clone(UcxMap *map, copy_func fnc, void *data) {
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118 size_t bs = (map->count * 5) >> 1;
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119 UcxMap *newmap = ucx_map_new(bs > map->size ? bs : map->size);
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120 if (!newmap) {
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121 return NULL;
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122 }
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123 ucx_map_copy(map, newmap, fnc, data);
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124 return newmap;
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125 }
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126
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127 int ucx_map_rehash(UcxMap *map) {
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128 size_t load = (map->size * 3) >> 2;
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129 if (map->count > load) {
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130 UcxMap oldmap;
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131 oldmap.map = map->map;
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132 oldmap.size = map->size;
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133 oldmap.count = map->count;
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134 oldmap.allocator = map->allocator;
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135
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136 map->size = (map->count * 5) >> 1;
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137 map->map = (UcxMapElement**)alcalloc(
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138 map->allocator, map->size, sizeof(UcxMapElement*));
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139 if (!map->map) {
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140 *map = oldmap;
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141 return 1;
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142 }
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143 map->count = 0;
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144 ucx_map_copy(&oldmap, map, NULL, NULL);
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145
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146 /* free the UcxMapElement list of oldmap */
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147 ucx_map_free_elmlist_contents(&oldmap);
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148 alfree(map->allocator, oldmap.map);
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149 }
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150 return 0;
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151 }
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152
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153 int ucx_map_put(UcxMap *map, UcxKey key, void *data) {
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154 UcxAllocator *allocator = map->allocator;
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155
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11dffb40cd91 new dav_query function
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156 if (key.hash == 0) {
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157 key.hash = ucx_hash((const char*)key.data, key.len);
1
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158 }
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159
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160 struct UcxMapKey mapkey;
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161 mapkey.hash = key.hash;
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162
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163 size_t slot = mapkey.hash%map->size;
335
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164 UcxMapElement *elm = map->map[slot];
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165 UcxMapElement *prev = NULL;
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166
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167 while (elm && elm->key.hash < mapkey.hash) {
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168 prev = elm;
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169 elm = elm->next;
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170 }
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171
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172 if (!elm || elm->key.hash != mapkey.hash) {
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173 UcxMapElement *e = (UcxMapElement*)almalloc(
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174 allocator, sizeof(UcxMapElement));
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175 if (!e) {
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176 return -1;
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177 }
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178 e->key.data = NULL;
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179 if (prev) {
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180 prev->next = e;
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181 } else {
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182 map->map[slot] = e;
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183 }
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184 e->next = elm;
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185 elm = e;
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186 }
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187
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188 if (!elm->key.data) {
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189 void *kd = almalloc(allocator, key.len);
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190 if (!kd) {
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191 return -1;
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192 }
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193 memcpy(kd, key.data, key.len);
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194 mapkey.data = kd;
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195 mapkey.len = key.len;
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196 elm->key = mapkey;
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197 map->count++;
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198 }
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199 elm->data = data;
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200
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201 return 0;
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202 }
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203
335
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diff changeset
204 static void* ucx_map_get_and_remove(UcxMap *map, UcxKey key, int remove) {
1
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205 if(key.hash == 0) {
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206 key.hash = ucx_hash((const char*)key.data, key.len);
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207 }
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208
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209 size_t slot = key.hash%map->size;
335
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diff changeset
210 UcxMapElement *elm = map->map[slot];
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211 UcxMapElement *pelm = NULL;
1
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212 while (elm && elm->key.hash <= key.hash) {
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213 if(elm->key.hash == key.hash) {
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214 int n = (key.len > elm->key.len) ? elm->key.len : key.len;
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215 if (memcmp(elm->key.data, key.data, n) == 0) {
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216 void *data = elm->data;
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217 if (remove) {
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218 if (pelm) {
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219 pelm->next = elm->next;
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220 } else {
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221 map->map[slot] = elm->next;
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222 }
70
88092b88ec00 ucx update
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diff changeset
223 alfree(map->allocator, elm->key.data);
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224 alfree(map->allocator, elm);
1
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225 map->count--;
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226 }
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227
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228 return data;
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229 }
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230 }
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231 pelm = elm;
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232 elm = pelm->next;
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233 }
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234
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235 return NULL;
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236 }
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237
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238 void *ucx_map_get(UcxMap *map, UcxKey key) {
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239 return ucx_map_get_and_remove(map, key, 0);
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240 }
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241
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242 void *ucx_map_remove(UcxMap *map, UcxKey key) {
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243 return ucx_map_get_and_remove(map, key, 1);
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244 }
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245
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246 UcxKey ucx_key(const void *data, size_t len) {
1
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247 UcxKey key;
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248 key.data = data;
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249 key.len = len;
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diff changeset
250 key.hash = ucx_hash((const char*)data, len);
1
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251 return key;
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252 }
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253
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254
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255 int ucx_hash(const char *data, size_t len) {
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256 /* murmur hash 2 */
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257
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258 int m = 0x5bd1e995;
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259 int r = 24;
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260
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261 int h = 25 ^ len;
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262
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263 int i = 0;
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264 while (len >= 4) {
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265 int k = data[i + 0] & 0xFF;
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266 k |= (data[i + 1] & 0xFF) << 8;
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267 k |= (data[i + 2] & 0xFF) << 16;
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268 k |= (data[i + 3] & 0xFF) << 24;
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269
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270 k *= m;
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271 k ^= k >> r;
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272 k *= m;
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273
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274 h *= m;
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275 h ^= k;
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276
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277 i += 4;
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278 len -= 4;
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279 }
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280
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diff changeset
281 switch (len) {
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282 case 3: h ^= (data[i + 2] & 0xFF) << 16;
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parents:
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283 /* no break */
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284 case 2: h ^= (data[i + 1] & 0xFF) << 8;
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285 /* no break */
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286 case 1: h ^= (data[i + 0] & 0xFF); h *= m;
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parents:
diff changeset
287 /* no break */
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288 }
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289
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290 h ^= h >> 13;
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291 h *= m;
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292 h ^= h >> 15;
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293
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294 return h;
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295 }
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296
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297 UcxMapIterator ucx_map_iterator(UcxMap *map) {
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diff changeset
298 UcxMapIterator i;
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diff changeset
299 i.map = map;
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300 i.cur = NULL;
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diff changeset
301 i.index = 0;
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302 return i;
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parents:
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303 }
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parents:
diff changeset
304
5
88625853ae74 new webdav api + repository and key configuration + aes encryption
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 1
diff changeset
305 int ucx_map_iter_next(UcxMapIterator *i, UcxKey *key, void **elm) {
1
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306 UcxMapElement *e = i->cur;
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parents:
diff changeset
307
17
11dffb40cd91 new dav_query function
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parents: 5
diff changeset
308 if (e) {
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diff changeset
309 e = e->next;
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310 } else {
1
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311 e = i->map->map[0];
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312 }
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313
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314 while (i->index < i->map->size) {
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315 if (e) {
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316 if (e->data) {
1
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317 i->cur = e;
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318 *elm = e->data;
505
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319 key->data = e->key.data;
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320 key->hash = e->key.hash;
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321 key->len = e->key.len;
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322 return 1;
1
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323 }
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324
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325 e = e->next;
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326 } else {
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327 i->index++;
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328
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329 if (i->index < i->map->size) {
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330 e = i->map->map[i->index];
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331 }
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332 }
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333 }
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334
17
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335 return 0;
1
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336 }
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337

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