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comparison mupdf-source/thirdparty/curl/docs/examples/post-callback.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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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22 /* <DESC>
23 * Issue an HTTP POST and provide the data through the read callback.
24 * </DESC>
25 */
26 #include <stdio.h>
27 #include <string.h>
28 #include <curl/curl.h>
29
30 /* silly test data to POST */
31 static const char data[]="Lorem ipsum dolor sit amet, consectetur adipiscing "
32 "elit. Sed vel urna neque. Ut quis leo metus. Quisque eleifend, ex at "
33 "laoreet rhoncus, odio ipsum semper metus, at tempus ante urna in mauris. "
34 "Suspendisse ornare tempor venenatis. Ut dui neque, pellentesque a varius "
35 "eget, mattis vitae ligula. Fusce ut pharetra est. Ut ullamcorper mi ac "
36 "sollicitudin semper. Praesent sit amet tellus varius, posuere nulla non, "
37 "rhoncus ipsum.";
38
39 struct WriteThis {
40 const char *readptr;
41 size_t sizeleft;
42 };
43
44 static size_t read_callback(void *dest, size_t size, size_t nmemb, void *userp)
45 {
46 struct WriteThis *wt = (struct WriteThis *)userp;
47 size_t buffer_size = size*nmemb;
48
49 if(wt->sizeleft) {
50 /* copy as much as possible from the source to the destination */
51 size_t copy_this_much = wt->sizeleft;
52 if(copy_this_much > buffer_size)
53 copy_this_much = buffer_size;
54 memcpy(dest, wt->readptr, copy_this_much);
55
56 wt->readptr += copy_this_much;
57 wt->sizeleft -= copy_this_much;
58 return copy_this_much; /* we copied this many bytes */
59 }
60
61 return 0; /* no more data left to deliver */
62 }
63
64 int main(void)
65 {
66 CURL *curl;
67 CURLcode res;
68
69 struct WriteThis wt;
70
71 wt.readptr = data;
72 wt.sizeleft = strlen(data);
73
74 /* In windows, this will init the winsock stuff */
75 res = curl_global_init(CURL_GLOBAL_DEFAULT);
76 /* Check for errors */
77 if(res != CURLE_OK) {
78 fprintf(stderr, "curl_global_init() failed: %s\n",
79 curl_easy_strerror(res));
80 return 1;
81 }
82
83 /* get a curl handle */
84 curl = curl_easy_init();
85 if(curl) {
86 /* First set the URL that is about to receive our POST. */
87 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/index.cgi");
88
89 /* Now specify we want to POST data */
90 curl_easy_setopt(curl, CURLOPT_POST, 1L);
91
92 /* we want to use our own read function */
93 curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
94
95 /* pointer to pass to our read function */
96 curl_easy_setopt(curl, CURLOPT_READDATA, &wt);
97
98 /* get verbose debug output please */
99 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
100
101 /*
102 If you use POST to a HTTP 1.1 server, you can send data without knowing
103 the size before starting the POST if you use chunked encoding. You
104 enable this by adding a header like "Transfer-Encoding: chunked" with
105 CURLOPT_HTTPHEADER. With HTTP 1.0 or without chunked transfer, you must
106 specify the size in the request.
107 */
108 #ifdef USE_CHUNKED
109 {
110 struct curl_slist *chunk = NULL;
111
112 chunk = curl_slist_append(chunk, "Transfer-Encoding: chunked");
113 res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
114 /* use curl_slist_free_all() after the *perform() call to free this
115 list again */
116 }
117 #else
118 /* Set the expected POST size. If you want to POST large amounts of data,
119 consider CURLOPT_POSTFIELDSIZE_LARGE */
120 curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)wt.sizeleft);
121 #endif
122
123 #ifdef DISABLE_EXPECT
124 /*
125 Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue"
126 header. You can disable this header with CURLOPT_HTTPHEADER as usual.
127 NOTE: if you want chunked transfer too, you need to combine these two
128 since you can only set one list of headers with CURLOPT_HTTPHEADER. */
129
130 /* A less good option would be to enforce HTTP 1.0, but that might also
131 have other implications. */
132 {
133 struct curl_slist *chunk = NULL;
134
135 chunk = curl_slist_append(chunk, "Expect:");
136 res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
137 /* use curl_slist_free_all() after the *perform() call to free this
138 list again */
139 }
140 #endif
141
142 /* Perform the request, res will get the return code */
143 res = curl_easy_perform(curl);
144 /* Check for errors */
145 if(res != CURLE_OK)
146 fprintf(stderr, "curl_easy_perform() failed: %s\n",
147 curl_easy_strerror(res));
148
149 /* always cleanup */
150 curl_easy_cleanup(curl);
151 }
152 curl_global_cleanup();
153 return 0;
154 }