Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/examples/post-callback.c @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +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 - 2017, 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 * Issue an HTTP POST and provide the data through the read callback.
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24 * </DESC>
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25 */
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26 #include <stdio.h>
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27 #include <string.h>
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28 #include <curl/curl.h>
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30 /* silly test data to POST */
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31 static const char data[]="Lorem ipsum dolor sit amet, consectetur adipiscing "
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32 "elit. Sed vel urna neque. Ut quis leo metus. Quisque eleifend, ex at "
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33 "laoreet rhoncus, odio ipsum semper metus, at tempus ante urna in mauris. "
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34 "Suspendisse ornare tempor venenatis. Ut dui neque, pellentesque a varius "
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35 "eget, mattis vitae ligula. Fusce ut pharetra est. Ut ullamcorper mi ac "
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36 "sollicitudin semper. Praesent sit amet tellus varius, posuere nulla non, "
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37 "rhoncus ipsum.";
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39 struct WriteThis {
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40 const char *readptr;
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41 size_t sizeleft;
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42 };
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44 static size_t read_callback(void *dest, size_t size, size_t nmemb, void *userp)
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45 {
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46 struct WriteThis *wt = (struct WriteThis *)userp;
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47 size_t buffer_size = size*nmemb;
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48
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49 if(wt->sizeleft) {
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50 /* copy as much as possible from the source to the destination */
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51 size_t copy_this_much = wt->sizeleft;
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52 if(copy_this_much > buffer_size)
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53 copy_this_much = buffer_size;
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54 memcpy(dest, wt->readptr, copy_this_much);
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56 wt->readptr += copy_this_much;
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57 wt->sizeleft -= copy_this_much;
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58 return copy_this_much; /* we copied this many bytes */
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59 }
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61 return 0; /* no more data left to deliver */
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62 }
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64 int main(void)
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65 {
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66 CURL *curl;
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67 CURLcode res;
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69 struct WriteThis wt;
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71 wt.readptr = data;
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72 wt.sizeleft = strlen(data);
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74 /* In windows, this will init the winsock stuff */
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75 res = curl_global_init(CURL_GLOBAL_DEFAULT);
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76 /* Check for errors */
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77 if(res != CURLE_OK) {
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78 fprintf(stderr, "curl_global_init() failed: %s\n",
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79 curl_easy_strerror(res));
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80 return 1;
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81 }
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83 /* get a curl handle */
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84 curl = curl_easy_init();
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85 if(curl) {
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86 /* First set the URL that is about to receive our POST. */
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87 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/index.cgi");
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89 /* Now specify we want to POST data */
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90 curl_easy_setopt(curl, CURLOPT_POST, 1L);
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92 /* we want to use our own read function */
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93 curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
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95 /* pointer to pass to our read function */
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96 curl_easy_setopt(curl, CURLOPT_READDATA, &wt);
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98 /* get verbose debug output please */
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99 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
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100
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101 /*
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102 If you use POST to a HTTP 1.1 server, you can send data without knowing
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103 the size before starting the POST if you use chunked encoding. You
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104 enable this by adding a header like "Transfer-Encoding: chunked" with
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105 CURLOPT_HTTPHEADER. With HTTP 1.0 or without chunked transfer, you must
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106 specify the size in the request.
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107 */
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108 #ifdef USE_CHUNKED
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109 {
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110 struct curl_slist *chunk = NULL;
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111
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112 chunk = curl_slist_append(chunk, "Transfer-Encoding: chunked");
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113 res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
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114 /* use curl_slist_free_all() after the *perform() call to free this
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115 list again */
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116 }
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117 #else
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118 /* Set the expected POST size. If you want to POST large amounts of data,
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119 consider CURLOPT_POSTFIELDSIZE_LARGE */
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120 curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)wt.sizeleft);
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121 #endif
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122
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123 #ifdef DISABLE_EXPECT
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124 /*
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125 Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue"
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126 header. You can disable this header with CURLOPT_HTTPHEADER as usual.
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127 NOTE: if you want chunked transfer too, you need to combine these two
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128 since you can only set one list of headers with CURLOPT_HTTPHEADER. */
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129
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130 /* A less good option would be to enforce HTTP 1.0, but that might also
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131 have other implications. */
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132 {
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133 struct curl_slist *chunk = NULL;
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134
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135 chunk = curl_slist_append(chunk, "Expect:");
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136 res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
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137 /* use curl_slist_free_all() after the *perform() call to free this
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138 list again */
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139 }
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140 #endif
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141
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142 /* Perform the request, res will get the return code */
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143 res = curl_easy_perform(curl);
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144 /* Check for errors */
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145 if(res != CURLE_OK)
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146 fprintf(stderr, "curl_easy_perform() failed: %s\n",
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147 curl_easy_strerror(res));
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148
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149 /* always cleanup */
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150 curl_easy_cleanup(curl);
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151 }
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152 curl_global_cleanup();
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153 return 0;
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154 }