Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/examples/getinmemory.c @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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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 * Shows how the write callback function can be used to download data into a
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24 * chunk of memory instead of storing it in a file.
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25 * </DESC>
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26 */
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <string.h>
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32 #include <curl/curl.h>
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34 struct MemoryStruct {
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35 char *memory;
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36 size_t size;
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37 };
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39 static size_t
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40 WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
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41 {
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42 size_t realsize = size * nmemb;
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43 struct MemoryStruct *mem = (struct MemoryStruct *)userp;
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44
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45 char *ptr = realloc(mem->memory, mem->size + realsize + 1);
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46 if(ptr == NULL) {
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47 /* out of memory! */
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48 printf("not enough memory (realloc returned NULL)\n");
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49 return 0;
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50 }
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52 mem->memory = ptr;
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53 memcpy(&(mem->memory[mem->size]), contents, realsize);
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54 mem->size += realsize;
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55 mem->memory[mem->size] = 0;
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57 return realsize;
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58 }
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60 int main(void)
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61 {
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62 CURL *curl_handle;
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63 CURLcode res;
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64
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65 struct MemoryStruct chunk;
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66
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67 chunk.memory = malloc(1); /* will be grown as needed by the realloc above */
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68 chunk.size = 0; /* no data at this point */
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70 curl_global_init(CURL_GLOBAL_ALL);
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72 /* init the curl session */
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73 curl_handle = curl_easy_init();
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75 /* specify URL to get */
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76 curl_easy_setopt(curl_handle, CURLOPT_URL, "https://www.example.com/");
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78 /* send all data to this function */
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79 curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
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81 /* we pass our 'chunk' struct to the callback function */
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82 curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
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83
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84 /* some servers don't like requests that are made without a user-agent
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85 field, so we provide one */
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86 curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurl-agent/1.0");
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87
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88 /* get it! */
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89 res = curl_easy_perform(curl_handle);
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91 /* check for errors */
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92 if(res != CURLE_OK) {
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93 fprintf(stderr, "curl_easy_perform() failed: %s\n",
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94 curl_easy_strerror(res));
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95 }
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96 else {
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97 /*
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98 * Now, our chunk.memory points to a memory block that is chunk.size
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99 * bytes big and contains the remote file.
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100 *
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101 * Do something nice with it!
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102 */
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103
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104 printf("%lu bytes retrieved\n", (unsigned long)chunk.size);
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105 }
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106
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107 /* cleanup curl stuff */
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108 curl_easy_cleanup(curl_handle);
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109
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110 free(chunk.memory);
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111
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112 /* we're done with libcurl, so clean it up */
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113 curl_global_cleanup();
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114
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115 return 0;
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116 }