ucx/map.c

Thu, 12 Oct 2017 20:37:46 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Thu, 12 Oct 2017 20:37:46 +0200
changeset 330
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parent 255
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child 335
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permissions
-rw-r--r--

adds dav get option to keep existing files

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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 2016 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 <stdlib.h>
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30 #include <string.h>
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31
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32 #include "map.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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42
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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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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 destr(val);
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90 }
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91 }
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92
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93 void ucx_map_clear(UcxMap *map) {
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94 if (map->count == 0) {
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95 return; // nothing to do
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96 }
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97 ucx_map_free_elmlist_contents(map);
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98 memset(map->map, 0, map->size*sizeof(UcxMapElement*));
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99 map->count = 0;
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100 }
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101
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102 int ucx_map_copy(UcxMap *restrict from, UcxMap *restrict to,
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103 copy_func fnc, void *data) {
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104 UcxMapIterator i = ucx_map_iterator(from);
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105 void *value;
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106 UCX_MAP_FOREACH(key, value, i) {
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107 if (ucx_map_put(to, key, fnc ? fnc(value, data) : value)) {
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108 return 1;
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109 }
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110 }
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111 return 0;
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112 }
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113
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114 UcxMap *ucx_map_clone(UcxMap *map, copy_func fnc, void *data) {
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115 size_t bs = (map->count * 5) >> 1;
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116 UcxMap *newmap = ucx_map_new(bs > map->size ? bs : map->size);
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117 if (!newmap) {
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118 return NULL;
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119 }
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120 ucx_map_copy(map, newmap, fnc, data);
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121 return newmap;
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122 }
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123
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124 int ucx_map_rehash(UcxMap *map) {
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125 size_t load = (map->size * 3) >> 2;
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126 if (map->count > load) {
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127 UcxMap oldmap;
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128 oldmap.map = map->map;
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129 oldmap.size = map->size;
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130 oldmap.count = map->count;
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131 oldmap.allocator = map->allocator;
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132
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133 map->size = (map->count * 5) >> 1;
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134 map->map = (UcxMapElement**)alcalloc(
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135 map->allocator, map->size, sizeof(UcxMapElement*));
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136 if (!map->map) {
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137 *map = oldmap;
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138 return 1;
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139 }
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140 map->count = 0;
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141 ucx_map_copy(&oldmap, map, NULL, NULL);
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142
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143 /* free the UcxMapElement list of oldmap */
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144 ucx_map_free_elmlist_contents(&oldmap);
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145 alfree(map->allocator, oldmap.map);
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146 }
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147 return 0;
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148 }
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149
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150 int ucx_map_put(UcxMap *map, UcxKey key, void *data) {
5
88625853ae74 new webdav api + repository and key configuration + aes encryption
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parents: 1
diff changeset
151 UcxAllocator *allocator = map->allocator;
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diff changeset
152
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153 if (key.hash == 0) {
1
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154 key.hash = ucx_hash((char*)key.data, key.len);
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155 }
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156
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157 size_t slot = key.hash%map->size;
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158 UcxMapElement *restrict elm = map->map[slot];
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159 UcxMapElement *restrict prev = NULL;
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160
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diff changeset
161 while (elm && elm->key.hash < key.hash) {
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162 prev = elm;
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163 elm = elm->next;
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164 }
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165
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diff changeset
166 if (!elm || elm->key.hash != key.hash) {
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88092b88ec00 ucx update
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167 UcxMapElement *e = (UcxMapElement*)almalloc(
88092b88ec00 ucx update
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diff changeset
168 allocator, sizeof(UcxMapElement));
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169 if (!e) {
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170 return -1;
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171 }
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172 e->key.data = NULL;
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173 if (prev) {
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174 prev->next = e;
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175 } else {
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176 map->map[slot] = e;
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177 }
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178 e->next = elm;
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179 elm = e;
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180 }
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181
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182 if (!elm->key.data) {
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183 void *kd = almalloc(allocator, key.len);
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184 if (!kd) {
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185 return -1;
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186 }
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187 memcpy(kd, key.data, key.len);
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188 key.data = kd;
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189 elm->key = key;
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190 map->count++;
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191 }
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192 elm->data = data;
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193
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194 return 0;
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195 }
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196
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197 void* ucx_map_get_and_remove(UcxMap *map, UcxKey key, _Bool remove) {
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198 if(key.hash == 0) {
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199 key.hash = ucx_hash((char*)key.data, key.len);
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200 }
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201
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202 size_t slot = key.hash%map->size;
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203 UcxMapElement *restrict elm = map->map[slot];
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204 UcxMapElement *restrict pelm = NULL;
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205 while (elm && elm->key.hash <= key.hash) {
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206 if(elm->key.hash == key.hash) {
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207 int n = (key.len > elm->key.len) ? elm->key.len : key.len;
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208 if (memcmp(elm->key.data, key.data, n) == 0) {
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209 void *data = elm->data;
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210 if (remove) {
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211 if (pelm) {
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diff changeset
212 pelm->next = elm->next;
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213 } else {
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214 map->map[slot] = elm->next;
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215 }
70
88092b88ec00 ucx update
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diff changeset
216 alfree(map->allocator, elm->key.data);
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diff changeset
217 alfree(map->allocator, elm);
1
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218 map->count--;
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219 }
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220
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221 return data;
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222 }
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223 }
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224 pelm = elm;
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225 elm = pelm->next;
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226 }
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227
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228 return NULL;
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229 }
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230
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231 void *ucx_map_get(UcxMap *map, UcxKey key) {
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232 return ucx_map_get_and_remove(map, key, 0);
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233 }
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234
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235 void *ucx_map_remove(UcxMap *map, UcxKey key) {
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236 return ucx_map_get_and_remove(map, key, 1);
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237 }
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238
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239 UcxKey ucx_key(void *data, size_t len) {
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240 UcxKey key;
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241 key.data = data;
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242 key.len = len;
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diff changeset
243 key.hash = ucx_hash((const char*) data, len);
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244 return key;
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245 }
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246
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247
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248 int ucx_hash(const char *data, size_t len) {
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249 /* murmur hash 2 */
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250
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251 int m = 0x5bd1e995;
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252 int r = 24;
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253
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254 int h = 25 ^ len;
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255
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diff changeset
256 int i = 0;
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diff changeset
257 while (len >= 4) {
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diff changeset
258 int k = data[i + 0] & 0xFF;
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259 k |= (data[i + 1] & 0xFF) << 8;
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260 k |= (data[i + 2] & 0xFF) << 16;
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diff changeset
261 k |= (data[i + 3] & 0xFF) << 24;
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262
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diff changeset
263 k *= m;
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parents:
diff changeset
264 k ^= k >> r;
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diff changeset
265 k *= m;
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266
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diff changeset
267 h *= m;
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268 h ^= k;
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269
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270 i += 4;
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271 len -= 4;
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272 }
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273
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parents:
diff changeset
274 switch (len) {
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parents:
diff changeset
275 case 3: h ^= (data[i + 2] & 0xFF) << 16;
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parents:
diff changeset
276 /* no break */
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diff changeset
277 case 2: h ^= (data[i + 1] & 0xFF) << 8;
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parents:
diff changeset
278 /* no break */
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diff changeset
279 case 1: h ^= (data[i + 0] & 0xFF); h *= m;
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parents:
diff changeset
280 /* no break */
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parents:
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281 }
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282
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283 h ^= h >> 13;
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284 h *= m;
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diff changeset
285 h ^= h >> 15;
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286
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287 return h;
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parents:
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288 }
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289
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parents:
diff changeset
290 UcxMapIterator ucx_map_iterator(UcxMap *map) {
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parents:
diff changeset
291 UcxMapIterator i;
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diff changeset
292 i.map = map;
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diff changeset
293 i.cur = NULL;
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diff changeset
294 i.index = 0;
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295 return i;
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diff changeset
296 }
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diff changeset
297
5
88625853ae74 new webdav api + repository and key configuration + aes encryption
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diff changeset
298 int ucx_map_iter_next(UcxMapIterator *i, UcxKey *key, void **elm) {
1
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299 UcxMapElement *e = i->cur;
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parents:
diff changeset
300
17
11dffb40cd91 new dav_query function
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diff changeset
301 if (e) {
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diff changeset
302 e = e->next;
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diff changeset
303 } else {
1
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diff changeset
304 e = i->map->map[0];
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parents:
diff changeset
305 }
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parents:
diff changeset
306
17
11dffb40cd91 new dav_query function
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parents: 5
diff changeset
307 while (i->index < i->map->size) {
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diff changeset
308 if (e) {
11dffb40cd91 new dav_query function
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diff changeset
309 if (e->data) {
1
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parents:
diff changeset
310 i->cur = e;
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parents:
diff changeset
311 *elm = e->data;
5
88625853ae74 new webdav api + repository and key configuration + aes encryption
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parents: 1
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312 *key = e->key;
17
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313 return 1;
1
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314 }
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315
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316 e = e->next;
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317 } else {
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318 i->index++;
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319
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320 if (i->index < i->map->size) {
1
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321 e = i->map->map[i->index];
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322 }
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323 }
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324 }
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Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
325
17
11dffb40cd91 new dav_query function
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326 return 0;
1
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327 }
1bcaac272cdf added existing source code
Olaf Wintermann <olaf.wintermann@gmail.com>
parents:
diff changeset
328

mercurial