Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/examples/externalsocket.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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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 * An example demonstrating how an application can pass in a custom
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24 * socket to libcurl to use. This example also handles the connect itself.
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25 * </DESC>
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26 */
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27 #include <stdio.h>
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28 #include <string.h>
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29 #include <stdlib.h>
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30 #include <curl/curl.h>
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31
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32 #ifdef WIN32
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33 #include <windows.h>
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34 #include <winsock2.h>
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35 #include <ws2tcpip.h>
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36 #define close closesocket
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37 #else
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38 #include <sys/types.h> /* socket types */
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39 #include <sys/socket.h> /* socket definitions */
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40 #include <netinet/in.h>
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41 #include <arpa/inet.h> /* inet (3) functions */
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42 #include <unistd.h> /* misc. Unix functions */
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43 #endif
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44
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45 #include <errno.h>
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46
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47 /* The IP address and port number to connect to */
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48 #define IPADDR "127.0.0.1"
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49 #define PORTNUM 80
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50
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51 #ifndef INADDR_NONE
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52 #define INADDR_NONE 0xffffffff
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53 #endif
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54
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55 static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)
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56 {
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57 size_t written = fwrite(ptr, size, nmemb, (FILE *)stream);
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58 return written;
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59 }
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60
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61 static int closecb(void *clientp, curl_socket_t item)
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62 {
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63 (void)clientp;
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64 printf("libcurl wants to close %d now\n", (int)item);
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65 return 0;
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66 }
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67
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68 static curl_socket_t opensocket(void *clientp,
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69 curlsocktype purpose,
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70 struct curl_sockaddr *address)
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71 {
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72 curl_socket_t sockfd;
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73 (void)purpose;
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74 (void)address;
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75 sockfd = *(curl_socket_t *)clientp;
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76 /* the actual externally set socket is passed in via the OPENSOCKETDATA
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77 option */
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78 return sockfd;
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79 }
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80
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81 static int sockopt_callback(void *clientp, curl_socket_t curlfd,
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82 curlsocktype purpose)
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83 {
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84 (void)clientp;
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85 (void)curlfd;
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86 (void)purpose;
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87 /* This return code was added in libcurl 7.21.5 */
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88 return CURL_SOCKOPT_ALREADY_CONNECTED;
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89 }
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90
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91 int main(void)
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92 {
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93 CURL *curl;
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94 CURLcode res;
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95 struct sockaddr_in servaddr; /* socket address structure */
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96 curl_socket_t sockfd;
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97
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98 #ifdef WIN32
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99 WSADATA wsaData;
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100 int initwsa = WSAStartup(MAKEWORD(2, 0), &wsaData);
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101 if(initwsa != 0) {
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102 printf("WSAStartup failed: %d\n", initwsa);
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103 return 1;
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104 }
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105 #endif
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106
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107 curl = curl_easy_init();
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108 if(curl) {
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109 /*
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110 * Note that libcurl will internally think that you connect to the host
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111 * and port that you specify in the URL option.
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112 */
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113 curl_easy_setopt(curl, CURLOPT_URL, "http://99.99.99.99:9999");
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114
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115 /* Create the socket "manually" */
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116 sockfd = socket(AF_INET, SOCK_STREAM, 0);
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117 if(sockfd == CURL_SOCKET_BAD) {
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118 printf("Error creating listening socket.\n");
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119 return 3;
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120 }
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121
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122 memset(&servaddr, 0, sizeof(servaddr));
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123 servaddr.sin_family = AF_INET;
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124 servaddr.sin_port = htons(PORTNUM);
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125
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126 servaddr.sin_addr.s_addr = inet_addr(IPADDR);
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127 if(INADDR_NONE == servaddr.sin_addr.s_addr) {
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128 close(sockfd);
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129 return 2;
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130 }
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131
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132 if(connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) ==
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133 -1) {
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134 close(sockfd);
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135 printf("client error: connect: %s\n", strerror(errno));
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136 return 1;
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137 }
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138
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139 /* no progress meter please */
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140 curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L);
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141
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142 /* send all data to this function */
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143 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
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144
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145 /* call this function to get a socket */
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146 curl_easy_setopt(curl, CURLOPT_OPENSOCKETFUNCTION, opensocket);
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147 curl_easy_setopt(curl, CURLOPT_OPENSOCKETDATA, &sockfd);
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148
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149 /* call this function to close sockets */
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150 curl_easy_setopt(curl, CURLOPT_CLOSESOCKETFUNCTION, closecb);
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151 curl_easy_setopt(curl, CURLOPT_CLOSESOCKETDATA, &sockfd);
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152
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153 /* call this function to set options for the socket */
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154 curl_easy_setopt(curl, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
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155
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156 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
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157
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158 res = curl_easy_perform(curl);
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159
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160 curl_easy_cleanup(curl);
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161
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162 close(sockfd);
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163
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164 if(res) {
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165 printf("libcurl error: %d\n", res);
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166 return 4;
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167 }
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168 }
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169
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170 #ifdef WIN32
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171 WSACleanup();
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172 #endif
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173 return 0;
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174 }