Thu, 28 May 2015 14:15:32 +0200
fixed null pointer access on end of token stream by adding a special END token to the stream
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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 2015 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 <stdio.h> |
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30 | #include <stdlib.h> |
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31 | #include <string.h> |
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32 | |
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33 | #include "db.h" |
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34 | |
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35 | #include <libidav/utils.h> |
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36 | |
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37 | #include <libxml/encoding.h> |
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38 | #include <libxml/xmlwriter.h> |
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39 | |
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40 | |
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41 | #define xstreq(a,b) xmlStrEqual(BAD_CAST a, BAD_CAST b) |
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42 | |
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43 | #ifdef _WIN32 |
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44 | #define ENV_HOME getenv("USERPROFILE") |
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45 | #else |
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46 | #define ENV_HOME getenv("HOME") |
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47 | #endif /* _WIN32 */ |
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48 | |
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49 | SyncDatabase* load_db(char *name) { |
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50 | char *dav_dir = util_concat_path(ENV_HOME, ".dav"); |
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51 | char *db_file = util_concat_path(dav_dir, name); |
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52 | free(dav_dir); |
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53 | |
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54 | SyncDatabase *db = malloc(sizeof(SyncDatabase)); |
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55 | xmlTextReaderPtr reader = xmlReaderForFile(db_file, NULL, 0); |
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56 | if(!reader) { |
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57 | xmlDoc *doc = doc = xmlNewDoc(BAD_CAST "1.0"); |
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58 | xmlNode *root = xmlNewNode(NULL, BAD_CAST "directory"); |
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59 | xmlDocSetRootElement(doc, root); |
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60 | if(xmlSaveFormatFileEnc(db_file, doc, "UTF-8", 1) != -1) { |
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61 | db->resources = ucx_map_new(2048); |
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62 | db->remove = ucx_map_new(8); |
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63 | } else { |
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64 | free(db); |
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65 | db = NULL; |
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66 | } |
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67 | xmlFreeDoc(doc); |
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68 | free(db_file); |
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69 | return db; |
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70 | } |
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71 | free(db_file); |
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72 | |
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73 | db->resources = ucx_map_new(2048); |
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74 | db->remove = ucx_map_new(16); |
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75 | int error = 0; |
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76 | while(xmlTextReaderRead(reader)) { |
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77 | int type = xmlTextReaderNodeType(reader); |
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78 | const xmlChar *name = xmlTextReaderConstName(reader); |
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79 | |
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80 | if(type == XML_READER_TYPE_ELEMENT) { |
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81 | if(xstreq(name, "resource")) { |
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82 | LocalResource *res = process_resource(reader); |
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83 | if(res) { |
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84 | ucx_map_cstr_put(db->resources, res->path, res); |
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85 | } else { |
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86 | error = 1; |
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87 | break; |
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88 | } |
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89 | } else if(xstreq(name, "remove")) { |
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90 | LocalResource *res = process_remove(reader); |
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91 | if(res) { |
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92 | ucx_map_cstr_put(db->remove, res->path, res); |
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93 | } else { |
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94 | error = 1; |
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95 | break; |
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96 | } |
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97 | } |
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98 | } |
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99 | } |
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100 | |
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101 | xmlFreeTextReader(reader); |
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102 | if(error) { |
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103 | // TODO: free resources and map |
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104 | return NULL; |
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105 | } else { |
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106 | return db; |
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107 | } |
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108 | } |
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109 | |
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110 | LocalResource* process_resource(xmlTextReaderPtr reader) { |
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111 | LocalResource *res = calloc(1, sizeof(LocalResource)); |
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112 | |
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113 | int field = -1; |
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114 | while(xmlTextReaderRead(reader)) { |
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115 | int type = xmlTextReaderNodeType(reader); |
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116 | const xmlChar *name = xmlTextReaderConstName(reader); |
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117 | |
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118 | if(type == XML_READER_TYPE_ELEMENT) { |
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119 | if(xstreq(name, "path")) { |
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120 | field = 0; |
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121 | } else if(xstreq(name, "etag")) { |
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122 | field = 1; |
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123 | } else if(xstreq(name, "lastmodified")) { |
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124 | field = 2; |
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125 | } else if(xstreq(name, "size")) { |
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126 | field = 3; |
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127 | } |
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128 | } else if(type == XML_READER_TYPE_TEXT) { |
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129 | const xmlChar *value = xmlTextReaderConstValue(reader); |
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130 | int b = 0; |
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131 | switch(field) { |
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132 | case 0: { |
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133 | res->path = strdup((char*)value); |
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134 | break; |
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135 | } |
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136 | case 1: { |
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137 | res->etag = strdup((char*)value); |
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138 | break; |
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139 | } |
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140 | case 2: { |
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141 | //res->last_modified = util_parse_lastmodified((char*)value); |
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142 | //res->last_modified = atoi((char*)value); |
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143 | char *endptr = (char*)value; |
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144 | time_t t = strtoll((char*)value, &endptr, 10); |
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145 | if(endptr == (char*)value) { |
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146 | fprintf( |
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147 | stderr, |
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148 | "lastmodified contains not a number: %s\n", value); |
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149 | } else { |
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150 | res->last_modified = t; |
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151 | } |
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152 | break; |
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153 | } |
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154 | case 3: { |
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155 | res->size = atoi((char*)value); |
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156 | break; |
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157 | } |
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158 | } |
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159 | } else if(XML_READER_TYPE_END_ELEMENT) { |
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160 | if(xstreq(name, "resource")) { |
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161 | break; |
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162 | } else { |
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163 | field = -1; |
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164 | } |
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165 | } |
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166 | } |
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167 | |
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168 | if(!res->path || res->last_modified == 0) { |
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169 | // TODO: free res |
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170 | return NULL; |
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171 | } else { |
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172 | return res; |
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173 | } |
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174 | } |
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175 | |
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176 | LocalResource* process_remove(xmlTextReaderPtr reader) { |
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177 | LocalResource *res = calloc(1, sizeof(LocalResource)); |
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178 | |
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179 | int path = 0; |
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180 | while(xmlTextReaderRead(reader)) { |
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181 | int type = xmlTextReaderNodeType(reader); |
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182 | const xmlChar *name = xmlTextReaderConstName(reader); |
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183 | |
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184 | if(type == XML_READER_TYPE_ELEMENT) { |
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185 | if(xstreq(name, "path")) { |
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186 | path = 1; |
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187 | } |
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188 | } else if(type == XML_READER_TYPE_TEXT && path) { |
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189 | const xmlChar *value = xmlTextReaderConstValue(reader); |
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190 | res->path = strdup((char*)value); |
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191 | } else if(XML_READER_TYPE_END_ELEMENT) { |
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192 | if(xstreq(name, "remove")) { |
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193 | break; |
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194 | } else { |
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195 | path = 0; |
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196 | } |
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197 | } |
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198 | } |
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199 | |
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200 | if(!res->path) { |
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201 | // TODO: free res |
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202 | return NULL; |
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203 | } else { |
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204 | return res; |
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205 | } |
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206 | } |
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207 | |
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208 | int store_db(SyncDatabase *db, char *name) { |
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209 | // open writer |
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210 | char *dav_dir = util_concat_path(ENV_HOME, ".dav"); |
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211 | char *db_file = util_concat_path(dav_dir, name); |
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212 | free(dav_dir); |
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213 | xmlTextWriterPtr writer = xmlNewTextWriterFilename(db_file, 0); |
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214 | if(!writer) { |
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215 | fprintf(stderr, "Cannot write db file: %s\n", db_file); |
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216 | free(db_file); |
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217 | return -1; |
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218 | } |
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219 | free(db_file); |
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220 | |
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221 | // start document |
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222 | int r = 0; |
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223 | r = xmlTextWriterStartDocument(writer, NULL, "UTF-8", NULL); |
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224 | if(r < 0) { |
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225 | xmlFreeTextWriter(writer); |
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226 | return -1; |
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227 | } |
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228 | xmlTextWriterStartElement(writer, BAD_CAST "directory"); |
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229 | |
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230 | // write all resource entries |
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231 | UcxMapIterator i = ucx_map_iterator(db->resources); |
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232 | LocalResource *res; |
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233 | UCX_MAP_FOREACH(key, res, i) { |
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234 | // <resource> |
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235 | xmlTextWriterStartElement(writer, BAD_CAST "resource"); |
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236 | |
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237 | r = xmlTextWriterWriteElement( |
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238 | writer, |
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239 | BAD_CAST "path", |
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240 | BAD_CAST res->path); |
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241 | if(r < 0) { |
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242 | fprintf(stderr, "Cannot write path: %s\n", res->path); |
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243 | xmlFreeTextWriter(writer); |
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244 | return -1; |
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245 | } |
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246 | |
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247 | if(res->etag) { |
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248 | r = xmlTextWriterWriteElement( |
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249 | writer, |
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250 | BAD_CAST "etag", |
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251 | BAD_CAST res->etag); |
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252 | if(r < 0) { |
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253 | fprintf(stderr, "Cannot write etag: %s\n", res->etag); |
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254 | xmlFreeTextWriter(writer); |
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255 | return -1; |
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256 | } |
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257 | } |
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258 | |
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259 | r = xmlTextWriterWriteFormatElement( |
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260 | writer, |
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261 | BAD_CAST "lastmodified", |
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262 | "%" PRId64, |
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263 | (int64_t)res->last_modified); |
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264 | if(r < 0) { |
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265 | fprintf(stderr, "Cannot write lastmodified\n"); |
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266 | xmlFreeTextWriter(writer); |
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267 | return -1; |
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268 | } |
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269 | |
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270 | r = xmlTextWriterWriteFormatElement( |
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271 | writer, |
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272 | BAD_CAST "size", |
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273 | "%" PRId64, |
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274 | (int64_t)res->size); |
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275 | if(r < 0) { |
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276 | fprintf(stderr, "Cannot write size\n"); |
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277 | xmlFreeTextWriter(writer); |
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278 | return -1; |
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279 | } |
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280 | |
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281 | // </resource> |
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282 | xmlTextWriterEndElement(writer); |
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283 | } |
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284 | |
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285 | // write all remove entries |
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286 | i = ucx_map_iterator(db->remove); |
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287 | UCX_MAP_FOREACH(key, res, i) { |
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288 | // <remove> |
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289 | xmlTextWriterStartElement(writer, BAD_CAST "remove"); |
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290 | |
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291 | xmlTextWriterWriteElement( |
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292 | writer, |
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293 | BAD_CAST "path", |
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294 | BAD_CAST res->path); |
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295 | |
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296 | // </remove> |
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297 | xmlTextWriterEndElement(writer); |
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298 | } |
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299 | |
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300 | // end |
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301 | xmlTextWriterEndElement(writer); |
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302 | r = xmlTextWriterEndDocument(writer); |
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303 | if(r < 0) { |
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304 | xmlFreeTextWriter(writer); |
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305 | return -1; |
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306 | } |
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307 | xmlFreeTextWriter(writer); |
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308 | return 0; |
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309 | } |