Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/examples/xmlstream.c @ 28:dcabf2733f0f

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Allow PEP 440 local version version specifiers in a PyMuPDF version
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 19:58:43 +0200
parents b50eed0cc0ef
children
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2
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1 /***************************************************************************
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2 * _ _ ____ _
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3 * Project ___| | | | _ \| |
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4 * / __| | | | |_) | |
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5 * | (__| |_| | _ <| |___
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6 * \___|\___/|_| \_\_____|
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7 *
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8 * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 *
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10 * This software is licensed as described in the file COPYING, which
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11 * you should have received as part of this distribution. The terms
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12 * are also available at https://curl.haxx.se/docs/copyright.html.
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13 *
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14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 * copies of the Software, and permit persons to whom the Software is
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16 * furnished to do so, under the terms of the COPYING file.
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17 *
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18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 * KIND, either express or implied.
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20 *
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21 ***************************************************************************/
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22 /* <DESC>
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23 * Stream-parse a document using the streaming Expat parser.
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24 * </DESC>
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25 */
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26 /* Written by David Strauss
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27 *
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28 * Expat => https://libexpat.github.io/
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29 *
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30 * gcc -Wall -I/usr/local/include xmlstream.c -lcurl -lexpat -o xmlstream
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31 *
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32 */
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33
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34 #include <stdio.h>
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35 #include <stdlib.h>
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36 #include <string.h>
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37 #include <assert.h>
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38
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39 #include <expat.h>
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40 #include <curl/curl.h>
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41
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42 struct MemoryStruct {
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43 char *memory;
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44 size_t size;
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45 };
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46
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47 struct ParserStruct {
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48 int ok;
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49 size_t tags;
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50 size_t depth;
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51 struct MemoryStruct characters;
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52 };
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53
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54 static void startElement(void *userData, const XML_Char *name,
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55 const XML_Char **atts)
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56 {
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57 struct ParserStruct *state = (struct ParserStruct *) userData;
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58 state->tags++;
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59 state->depth++;
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60
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61 /* Get a clean slate for reading in character data. */
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62 free(state->characters.memory);
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63 state->characters.memory = NULL;
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64 state->characters.size = 0;
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65 }
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66
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67 static void characterDataHandler(void *userData, const XML_Char *s, int len)
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68 {
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69 struct ParserStruct *state = (struct ParserStruct *) userData;
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70 struct MemoryStruct *mem = &state->characters;
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71
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72 char *ptr = realloc(mem->memory, mem->size + len + 1);
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73 if(!ptr) {
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74 /* Out of memory. */
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75 fprintf(stderr, "Not enough memory (realloc returned NULL).\n");
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76 state->ok = 0;
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77 return;
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78 }
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79
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80 mem->memory = ptr;
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81 memcpy(&(mem->memory[mem->size]), s, len);
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82 mem->size += len;
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83 mem->memory[mem->size] = 0;
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84 }
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85
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86 static void endElement(void *userData, const XML_Char *name)
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87 {
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88 struct ParserStruct *state = (struct ParserStruct *) userData;
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89 state->depth--;
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90
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91 printf("%5lu %10lu %s\n", state->depth, state->characters.size, name);
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92 }
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93
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94 static size_t parseStreamCallback(void *contents, size_t length, size_t nmemb,
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95 void *userp)
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96 {
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97 XML_Parser parser = (XML_Parser) userp;
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98 size_t real_size = length * nmemb;
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99 struct ParserStruct *state = (struct ParserStruct *) XML_GetUserData(parser);
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100
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101 /* Only parse if we're not already in a failure state. */
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102 if(state->ok && XML_Parse(parser, contents, real_size, 0) == 0) {
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103 int error_code = XML_GetErrorCode(parser);
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104 fprintf(stderr, "Parsing response buffer of length %lu failed"
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105 " with error code %d (%s).\n",
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106 real_size, error_code, XML_ErrorString(error_code));
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107 state->ok = 0;
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108 }
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109
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110 return real_size;
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111 }
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112
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113 int main(void)
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114 {
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115 CURL *curl_handle;
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116 CURLcode res;
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117 XML_Parser parser;
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118 struct ParserStruct state;
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119
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120 /* Initialize the state structure for parsing. */
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121 memset(&state, 0, sizeof(struct ParserStruct));
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122 state.ok = 1;
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123
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124 /* Initialize a namespace-aware parser. */
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125 parser = XML_ParserCreateNS(NULL, '\0');
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126 XML_SetUserData(parser, &state);
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127 XML_SetElementHandler(parser, startElement, endElement);
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128 XML_SetCharacterDataHandler(parser, characterDataHandler);
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129
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130 /* Initialize a libcurl handle. */
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131 curl_global_init(CURL_GLOBAL_DEFAULT);
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132 curl_handle = curl_easy_init();
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133 curl_easy_setopt(curl_handle, CURLOPT_URL,
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134 "https://www.w3schools.com/xml/simple.xml");
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135 curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, parseStreamCallback);
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136 curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)parser);
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137
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138 printf("Depth Characters Closing Tag\n");
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139
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140 /* Perform the request and any follow-up parsing. */
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141 res = curl_easy_perform(curl_handle);
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142 if(res != CURLE_OK) {
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143 fprintf(stderr, "curl_easy_perform() failed: %s\n",
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144 curl_easy_strerror(res));
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145 }
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146 else if(state.ok) {
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147 /* Expat requires one final call to finalize parsing. */
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diff changeset
148 if(XML_Parse(parser, NULL, 0, 1) == 0) {
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149 int error_code = XML_GetErrorCode(parser);
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150 fprintf(stderr, "Finalizing parsing failed with error code %d (%s).\n",
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diff changeset
151 error_code, XML_ErrorString(error_code));
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152 }
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153 else {
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154 printf(" --------------\n");
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155 printf(" %lu tags total\n", state.tags);
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156 }
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157 }
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parents:
diff changeset
158
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diff changeset
159 /* Clean up. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 free(state.characters.memory);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 XML_ParserFree(parser);
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diff changeset
162 curl_easy_cleanup(curl_handle);
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parents:
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163 curl_global_cleanup();
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164
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165 return 0;
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diff changeset
166 }