src/server/webdav/xml.c

Thu, 21 Apr 2022 17:16:49 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Thu, 21 Apr 2022 17:16:49 +0200
branch
webdav
changeset 305
4db64fe30588
parent 233
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child 318
60870dbac94f
permissions
-rw-r--r--

change pg_resolve_path signature to be useable without VFS

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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 2019 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 <ucx/string.h>
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34 #include <ucx/map.h>
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35
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36 #include "../util/util.h"
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37
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38 #include "xml.h"
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39
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40 /*****************************************************************************
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41 * Utility functions
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42 *****************************************************************************/
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43
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44 /*
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45 * generates a string key for an xml namespace
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46 * format: prefix '\0' href
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47 */
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48 static sstr_t xml_namespace_key(UcxAllocator *a, WSNamespace *ns) {
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49 sstr_t key = sstrcat_a(a, 3,
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50 ns->prefix ? sstr((char*)ns->prefix) : S("\0"),
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51 S("\0"),
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52 sstr((char*)ns->href));
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53 return key;
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54 }
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55
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56
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57 /*****************************************************************************
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58 * Public functions
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59 *****************************************************************************/
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60
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61 /* ------------------------ wsxml_iterator ------------------------ */
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62
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63 typedef struct StackElm {
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64 WSXmlNode *node; // list of nodes
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65 //WSXmlNode *parent; // if not NULL, call endcb after node->next is NULL
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66 int endonly;
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67 struct StackElm *next;
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68 } StackElm;
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69
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70 #define STACK_PUSH(stack, elm) if(stack) { elm->next = stack; } stack = elm;
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71
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72 int wsxml_iterator(
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73 pool_handle_t *pool,
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74 WSXmlNode *node,
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75 wsxml_func begincb,
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76 wsxml_func endcb,
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77 void *udata)
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78 {
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79 if(!node) {
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80 return 0;
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81 }
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82
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83 StackElm *stack = pool_malloc(pool, sizeof(StackElm));
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84 if(!stack) {
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85 return 1; // OOM
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86 }
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87 stack->next = NULL;
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88 stack->node = node;
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89 stack->endonly = 0;
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90 //stack->parent = NULL;
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91
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92 int ret = 0;
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93 int br = 0;
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94 while(stack) {
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95 StackElm *cur = stack;
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96 WSXmlNode *xmlnode = cur->node; // get top stack element
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97 stack = cur->next; // and remove it
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98 cur->next = NULL;
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99
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100 while(xmlnode && !cur->endonly) {
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101 // element begin callback
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102 if(begincb(xmlnode, udata)) {
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103 br = 1;
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104 break; // I don't like break with labels - is this wrong?
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105 }
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106
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107 if(xmlnode->children) {
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108 // put the children on the stack
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109 // the next stack iteration will process the children
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110 StackElm *newelm = pool_malloc(pool, sizeof(StackElm));
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111 if(!newelm) {
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112 ret = 1;
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113 br = 1;
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114 break;
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115 }
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116 newelm->next = NULL;
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117 newelm->node = xmlnode->children;
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118 // setting the parent will make sure endcb will be called
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119 // for the current xmlnode after all children are processed
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120 //newelm->parent = xmlnode;
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121 newelm->endonly = 0;
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122
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123 // if xmlnode->next is not NULL, there are still nodes at
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124 // this level, therefore we have to put these also on the
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125 // stack
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126 // this way, the remaining nodes are processed after all
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127 // children and the end tag are processed
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128 if(xmlnode->next) {
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129 StackElm *nextelm = pool_malloc(pool, sizeof(StackElm));
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130 if(!nextelm) {
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131 ret = 1;
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132 br = 1;
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133 break;
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134 }
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135 nextelm->node = xmlnode->next;
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136 nextelm->next = NULL;
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137 nextelm->endonly = 0;
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138 STACK_PUSH(stack, nextelm);
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139 }
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140
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141 // we have to put the end tag of the current element
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142 // on the stack to ensure endcb is called for the current
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143 // element, after all children are processed
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144 // reuse cur
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145 cur->node = xmlnode;
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146 cur->endonly = 1;
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147 STACK_PUSH(stack, cur);
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148
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149 cur = NULL;
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150
223
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151 // now we can put the children on the stack
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152 STACK_PUSH(stack, newelm);
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153 // break, because we don't want to process xmlnode->next now
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154 break;
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155 } else {
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156 // no children means, the end callback can be called directly
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157 // after the begin callback (no intermediate nodes)
224
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158 cur->node = NULL;
223
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159 if(endcb(xmlnode, udata)) {
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160 br = 1;
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161 break;
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162 }
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163 }
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164
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165 // continue with next node at this level
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166 xmlnode = xmlnode->next;
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167 }
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168 if(br) {
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169 break; // break because of an error
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170 }
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171
224
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172 if(cur && cur->node) {
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173 //xmlNode *endNode = cur->parent ? cur->parent : cur->node;
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174 xmlNode *endNode = cur->node;
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175 if(endcb(endNode, udata)) {
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176 break;
223
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177 }
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178 pool_free(pool, cur);
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179 }
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180 }
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181
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182 // free all remaining elements
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183 StackElm *elm = stack;
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184 while(elm) {
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185 StackElm *next = elm->next;
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186 pool_free(pool, elm);
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187 elm = next;
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188 }
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189
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190 return ret;
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191 }
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192
232
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193 /* ------------------- wsxml_get_required_namespaces ------------------- */
225
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194
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195 typedef struct WSNsCollector {
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196 UcxAllocator *a;
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197 UcxMap *nsmap;
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198 WebdavNSList *def;
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199 int error;
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200 } WSNsCollector;
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201
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202 static int nslist_node_begin(xmlNode *node, void *userdata) {
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203 WSNsCollector *col = userdata;
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204 // namespace required for all elements
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205 if(node->type == XML_ELEMENT_NODE && node->ns) {
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206 // we create a list of unique prefix-href namespaces by putting
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207 // all namespaces in a map
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208 sstr_t nskey = xml_namespace_key(col->a, node->ns);
225
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209 if(!nskey.ptr) {
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210 col->error = 1;
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211 return 1;
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212 }
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213 if(ucx_map_sstr_put(col->nsmap, nskey, node->ns)) {
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214 col->error = 1;
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215 return 1;
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216 }
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217
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218 // collect all namespace definitions for removing these namespaces
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219 // from col->nsmap later
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220 WSNamespace *def = node->nsDef;
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221 while(def) {
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222 WebdavNSList *newdef = col->a->malloc(
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223 col->a->pool, sizeof(WebdavNSList));
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224 if(!newdef) {
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225 col->error = 1;
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226 return 1;
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227 }
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228 newdef->namespace = def;
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229 newdef->prev = NULL;
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230 newdef->next = NULL;
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231 // prepend newdef to the list
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232 if(col->def) {
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233 newdef->next = col->def;
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234 col->def->prev = newdef;
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235 }
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236 col->def = newdef;
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237
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238 // continue with next namespace definition
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239 def = def->next;
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240 }
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241 }
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242 return 0;
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243 }
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244
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245 static int nslist_node_end(xmlNode *node, void *userdata) {
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246 return 0;
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247 }
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248
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249 WebdavNSList* wsxml_get_required_namespaces(
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250 pool_handle_t *pool,
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251 WSXmlNode *node,
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252 int *error)
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253 {
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254 if(error) *error = 0;
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255
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256 UcxAllocator a = util_pool_allocator(pool);
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257 UcxMap *nsmap = ucx_map_new_a(&a, 16);
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258 if(!nsmap) {
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259 if(error) *error = 1;
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260 return NULL;
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261 }
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262
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263 WSNsCollector col;
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264 col.a = &a;
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265 col.nsmap = nsmap;
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266 col.def = NULL;
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267
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268 // iterate over all xml elements
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269 // this will fill the hashmap with all namespaces
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270 // all namespace definitions are added to col.def
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271 WebdavNSList *list = NULL;
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272 WebdavNSList *end = NULL;
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273 if(wsxml_iterator(pool, node, nslist_node_begin, nslist_node_end, &col)) {
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274 if(error) *error = 1;
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275 } else {
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276 // remove all namespace definitions from the map
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277 // what we get is a map that contains all missing namespace definitions
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278 WebdavNSList *def = col.def;
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279 while(def) {
232
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280 sstr_t nskey = xml_namespace_key(&a, def->namespace);
225
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281 if(!nskey.ptr) {
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282 if(error) *error = 1;
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283 break;
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284 }
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285 ucx_map_sstr_remove(nsmap, nskey);
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286 def = def->next;
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287 }
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288
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289 // convert nsmap to a list
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290 UcxMapIterator i = ucx_map_iterator(nsmap);
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291 WSNamespace *ns;
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292 UCX_MAP_FOREACH(key, ns, i) {
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293 WebdavNSList *newelm = pool_malloc(pool, sizeof(WebdavNSList));
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294 if(!newelm) {
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295 if(error) *error = 1;
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296 list = NULL;
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297 break;
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298 }
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299 newelm->namespace = ns;
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300 newelm->next = NULL;
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301 newelm->prev = end; // NULL or the end of list
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302 if(end) {
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303 end->next = newelm; // append new element
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304 } else {
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305 list = newelm; // start new list
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306 }
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307 end = newelm;
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308 }
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309 }
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310
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311 ucx_map_free(nsmap);
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312 return list;
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313 }
232
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314
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315
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316 /*****************************************************************************
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317 * Non public functions
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318 *****************************************************************************/
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319
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320 typedef struct XmlWriter {
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321 /*
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322 * Memory pool for temp memory allocations
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323 */
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324 pool_handle_t *pool;
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325
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326 /*
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327 * Buffered output stream
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328 */
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329 Writer *out;
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330
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331 /*
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332 * Map for all previously defined namespaces
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333 * key: (char*) namespace prefix
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334 * value: WSNamespace*
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335 */
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336 UcxMap *namespaces;
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337
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338 /*
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339 * Should namespace definitions be created
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340 */
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341 WSBool define_namespaces;
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342 } XmlWriter;
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343
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344 /*
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345 * Serialize an XML text node
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346 * This replaces some special characters with entity refs
233
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347 * type: 0 = element text, 1 = attribute text
232
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348 */
233
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349 static void xml_ser_text(Writer *out, int type, const char *text) {
232
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350 size_t start = 0;
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351 size_t i;
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352 sstr_t entityref = { NULL, 0 };
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353 for(i=0;text[i]!='\0';i++) {
233
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354 char c = text[i];
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355 if(c == '&') {
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356 entityref = S("&amp;");
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357 } else if(type == 0) {
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358 if(c == '<') {
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359 entityref = S("&lt;");
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360 } else if(c == '>') {
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361 entityref = S("&gt;");
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362 }
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363 } else {
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364 if(c == '\"') {
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365 entityref = S("&quot;");
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366 } else if(c == '\'') {
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367 entityref = S("&apos;");
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368 }
232
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369 }
233
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370
232
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371 if(entityref.ptr) {
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372 size_t len = i-start;
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373 if(len > 0) {
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374 writer_put(out, text+start, len);
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375 }
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376 writer_puts(out, entityref);
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377 entityref.ptr = NULL;
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378 entityref.length = 0;
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379 start = i+1;
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380 }
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381 }
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382 size_t len = i-start;
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383 if(len > 0) {
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384 writer_put(out, text+start, len);
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385 }
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386 }
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387
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388 /*
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389 * Serialize an XML element node
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390 */
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391 static void xml_ser_element(XmlWriter *xw, xmlNode *node) {
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392 Writer *out = xw->out;
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393 writer_putc(out, '<');
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394
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395 // write prefix and ':'
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396 if(node->ns && node->ns->prefix) {
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397 writer_puts(out, sstr((char*)node->ns->prefix));
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398 writer_putc(out, ':');
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399 }
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400
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401 // node name
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402 writer_puts(out, sstr((char*)node->name));
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403
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404 // namespace definitions
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405 if(xw->define_namespaces) {
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406 xmlNs *nsdef = node->nsDef;
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407 while(nsdef) {
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408 // we define only namespaces without prefix or namespaces
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409 // with prefix, that are not already defined
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410 // xw->namespaces contains all namespace, that were defined
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411 // before xml serialization
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412 if(!nsdef->prefix) {
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413 writer_puts(out, S(" xmlns=\""));
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414 writer_puts(out, sstr((char*)nsdef->href));
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415 writer_putc(out, '"');
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416 } else {
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417 WSNamespace *n = xw->namespaces ?
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418 ucx_map_cstr_get(xw->namespaces, (char*)nsdef->prefix) :
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419 NULL;
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420 if(!n) {
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421 writer_puts(out, S(" xmlns:"));
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422 writer_puts(out, sstr((char*)nsdef->prefix));
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423 writer_puts(out, S("=\""));
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424 writer_puts(out, sstr((char*)nsdef->href));
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425 writer_putc(out, '"');
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426 }
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427 }
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428
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429 nsdef = nsdef->next;
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430 }
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431 }
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432
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433 // attributes
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434 xmlAttr *attr = node->properties;
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435 while(attr) {
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436 // format: ' [<prefix>:]<name>="<value>"'
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437 writer_putc(out, ' ');
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438 // optional namespace
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439 if(attr->ns && attr->ns->prefix) {
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440 writer_puts(out, sstr((char*)attr->ns->prefix));
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441 writer_putc(out, ':');
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442 }
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443 // <name>="
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444 writer_puts(out, sstr((char*)attr->name));
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445 writer_puts(out, S("=\""));
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446 // value
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447 xmlNode *value = attr->children;
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448 while(value) {
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449 if(value->content) {
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450 xml_ser_text(out, 1, (const char*)value->content);
232
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451 }
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452 value = value->next;
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453 }
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454 // trailing quote
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455 writer_putc(out, '"');
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456
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457 attr = attr->next;
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458 }
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459
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460 if(node->children) {
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461 writer_putc(out, '>');
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462 } else {
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463 writer_puts(out, S("/>"));
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464 }
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465 }
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466
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467 static int xml_ser_node_begin(xmlNode *node, void *userdata) {
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468 XmlWriter *xw = userdata;
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469 switch(node->type) {
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470 case XML_ELEMENT_NODE: xml_ser_element(xw, node); break;
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471 case XML_ATTRIBUTE_NODE: break;
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472 case XML_TEXT_NODE: {
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473 xml_ser_text(xw->out, 0, (const char*)node->content);
232
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474 break;
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475 }
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476 case XML_CDATA_SECTION_NODE: {
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477 break;
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478 }
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479 case XML_ENTITY_REF_NODE: break;
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480 case XML_ENTITY_NODE: break;
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481 case XML_PI_NODE: break;
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482 case XML_COMMENT_NODE: break;
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483 case XML_DOCUMENT_NODE: break;
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484 case XML_DOCUMENT_TYPE_NODE: break;
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diff changeset
485 case XML_DOCUMENT_FRAG_NODE: break;
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diff changeset
486 case XML_NOTATION_NODE: break;
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diff changeset
487 case XML_HTML_DOCUMENT_NODE: break;
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diff changeset
488 case XML_DTD_NODE: break;
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diff changeset
489 case XML_ELEMENT_DECL: break;
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diff changeset
490 case XML_ATTRIBUTE_DECL: break;
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491 case XML_ENTITY_DECL: break;
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diff changeset
492 case XML_NAMESPACE_DECL: break;
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diff changeset
493 case XML_XINCLUDE_START: break;
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diff changeset
494 case XML_XINCLUDE_END: break;
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diff changeset
495 default: break;
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496 }
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497 return 0;
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diff changeset
498 }
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diff changeset
499
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500 static int xml_ser_node_end(xmlNode *node, void *userdata) {
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501 XmlWriter *xw = userdata;
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502 Writer *out = xw->out;
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503 if(node->type == XML_ELEMENT_NODE) {
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504 if(node->children) {
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505 writer_puts(xw->out, S("</"));
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diff changeset
506 // write prefix and ':'
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507 if(node->ns && node->ns->prefix) {
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diff changeset
508 writer_puts(out, sstr((char*)node->ns->prefix));
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509 writer_putc(out, ':');
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diff changeset
510 }
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diff changeset
511 // name and close tag
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512 writer_puts(out, sstr((char*)node->name));
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513 writer_putc(out, '>');
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514
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515 } // element was already closed in xml_ser_node_begin
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516 }
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517 return 0;
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diff changeset
518 }
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diff changeset
519
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diff changeset
520
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diff changeset
521 static int xml_write_nodes(
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522 pool_handle_t *pool,
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523 Writer *out,
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diff changeset
524 UcxMap *nsdefs,
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diff changeset
525 WSBool createdefs,
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diff changeset
526 xmlNode *node)
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527 {
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528 XmlWriter xmlwriter;
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diff changeset
529 xmlwriter.pool = pool;
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diff changeset
530 xmlwriter.out = out;
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diff changeset
531 xmlwriter.namespaces = nsdefs;
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532 xmlwriter.define_namespaces = createdefs;
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diff changeset
533
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diff changeset
534 // iterate over xml nodes
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diff changeset
535 // this includes node->children and node->next
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diff changeset
536 int err = wsxml_iterator(
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diff changeset
537 pool,
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diff changeset
538 node,
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diff changeset
539 xml_ser_node_begin,
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540 xml_ser_node_end,
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541 &xmlwriter);
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diff changeset
542 if(err) {
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543 return -1;
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diff changeset
544 }
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diff changeset
545
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546 return out->error;
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diff changeset
547 }
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diff changeset
548
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diff changeset
549 int wsxml_write_nodes(
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diff changeset
550 pool_handle_t *pool,
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diff changeset
551 Writer *out,
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diff changeset
552 UcxMap *nsdefs,
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diff changeset
553 xmlNode *node)
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diff changeset
554 {
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diff changeset
555 return xml_write_nodes(pool, out, nsdefs, TRUE, node);
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diff changeset
556 }
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diff changeset
557
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diff changeset
558 int wsxml_write_nodes_without_nsdef(
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diff changeset
559 pool_handle_t *pool,
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diff changeset
560 Writer *out,
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561 xmlNode *node)
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diff changeset
562 {
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diff changeset
563 return xml_write_nodes(pool, out, NULL, FALSE, node);
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diff changeset
564 }

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