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comparison mupdf-source/thirdparty/curl/docs/examples/http2-download.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 - 2019, 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 * Multiplexed HTTP/2 downloads over a single connection
24 * </DESC>
25 */
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29
30 /* somewhat unix-specific */
31 #include <sys/time.h>
32 #include <unistd.h>
33
34 /* curl stuff */
35 #include <curl/curl.h>
36
37 #ifndef CURLPIPE_MULTIPLEX
38 /* This little trick will just make sure that we don't enable pipelining for
39 libcurls old enough to not have this symbol. It is _not_ defined to zero in
40 a recent libcurl header. */
41 #define CURLPIPE_MULTIPLEX 0
42 #endif
43
44 struct transfer {
45 CURL *easy;
46 unsigned int num;
47 FILE *out;
48 };
49
50 #define NUM_HANDLES 1000
51
52 static
53 void dump(const char *text, int num, unsigned char *ptr, size_t size,
54 char nohex)
55 {
56 size_t i;
57 size_t c;
58
59 unsigned int width = 0x10;
60
61 if(nohex)
62 /* without the hex output, we can fit more on screen */
63 width = 0x40;
64
65 fprintf(stderr, "%d %s, %lu bytes (0x%lx)\n",
66 num, text, (unsigned long)size, (unsigned long)size);
67
68 for(i = 0; i<size; i += width) {
69
70 fprintf(stderr, "%4.4lx: ", (unsigned long)i);
71
72 if(!nohex) {
73 /* hex not disabled, show it */
74 for(c = 0; c < width; c++)
75 if(i + c < size)
76 fprintf(stderr, "%02x ", ptr[i + c]);
77 else
78 fputs(" ", stderr);
79 }
80
81 for(c = 0; (c < width) && (i + c < size); c++) {
82 /* check for 0D0A; if found, skip past and start a new line of output */
83 if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
84 ptr[i + c + 1] == 0x0A) {
85 i += (c + 2 - width);
86 break;
87 }
88 fprintf(stderr, "%c",
89 (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
90 /* check again for 0D0A, to avoid an extra \n if it's at width */
91 if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
92 ptr[i + c + 2] == 0x0A) {
93 i += (c + 3 - width);
94 break;
95 }
96 }
97 fputc('\n', stderr); /* newline */
98 }
99 }
100
101 static
102 int my_trace(CURL *handle, curl_infotype type,
103 char *data, size_t size,
104 void *userp)
105 {
106 const char *text;
107 struct transfer *t = (struct transfer *)userp;
108 unsigned int num = t->num;
109 (void)handle; /* prevent compiler warning */
110
111 switch(type) {
112 case CURLINFO_TEXT:
113 fprintf(stderr, "== %u Info: %s", num, data);
114 /* FALLTHROUGH */
115 default: /* in case a new one is introduced to shock us */
116 return 0;
117
118 case CURLINFO_HEADER_OUT:
119 text = "=> Send header";
120 break;
121 case CURLINFO_DATA_OUT:
122 text = "=> Send data";
123 break;
124 case CURLINFO_SSL_DATA_OUT:
125 text = "=> Send SSL data";
126 break;
127 case CURLINFO_HEADER_IN:
128 text = "<= Recv header";
129 break;
130 case CURLINFO_DATA_IN:
131 text = "<= Recv data";
132 break;
133 case CURLINFO_SSL_DATA_IN:
134 text = "<= Recv SSL data";
135 break;
136 }
137
138 dump(text, num, (unsigned char *)data, size, 1);
139 return 0;
140 }
141
142 static void setup(struct transfer *t, int num)
143 {
144 char filename[128];
145 CURL *hnd;
146
147 hnd = t->easy = curl_easy_init();
148
149 snprintf(filename, 128, "dl-%d", num);
150
151 t->out = fopen(filename, "wb");
152
153 /* write to this file */
154 curl_easy_setopt(hnd, CURLOPT_WRITEDATA, t->out);
155
156 /* set the same URL */
157 curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
158
159 /* please be verbose */
160 curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
161 curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
162 curl_easy_setopt(hnd, CURLOPT_DEBUGDATA, t);
163
164 /* HTTP/2 please */
165 curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
166
167 /* we use a self-signed test server, skip verification during debugging */
168 curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
169 curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
170
171 #if (CURLPIPE_MULTIPLEX > 0)
172 /* wait for pipe connection to confirm */
173 curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
174 #endif
175 }
176
177 /*
178 * Download many transfers over HTTP/2, using the same connection!
179 */
180 int main(int argc, char **argv)
181 {
182 struct transfer trans[NUM_HANDLES];
183 CURLM *multi_handle;
184 int i;
185 int still_running = 0; /* keep number of running handles */
186 int num_transfers;
187 if(argc > 1) {
188 /* if given a number, do that many transfers */
189 num_transfers = atoi(argv[1]);
190 if((num_transfers < 1) || (num_transfers > NUM_HANDLES))
191 num_transfers = 3; /* a suitable low default */
192 }
193 else
194 num_transfers = 3; /* suitable default */
195
196 /* init a multi stack */
197 multi_handle = curl_multi_init();
198
199 for(i = 0; i < num_transfers; i++) {
200 setup(&trans[i], i);
201
202 /* add the individual transfer */
203 curl_multi_add_handle(multi_handle, trans[i].easy);
204 }
205
206 curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
207
208 /* we start some action by calling perform right away */
209 curl_multi_perform(multi_handle, &still_running);
210
211 while(still_running) {
212 struct timeval timeout;
213 int rc; /* select() return code */
214 CURLMcode mc; /* curl_multi_fdset() return code */
215
216 fd_set fdread;
217 fd_set fdwrite;
218 fd_set fdexcep;
219 int maxfd = -1;
220
221 long curl_timeo = -1;
222
223 FD_ZERO(&fdread);
224 FD_ZERO(&fdwrite);
225 FD_ZERO(&fdexcep);
226
227 /* set a suitable timeout to play around with */
228 timeout.tv_sec = 1;
229 timeout.tv_usec = 0;
230
231 curl_multi_timeout(multi_handle, &curl_timeo);
232 if(curl_timeo >= 0) {
233 timeout.tv_sec = curl_timeo / 1000;
234 if(timeout.tv_sec > 1)
235 timeout.tv_sec = 1;
236 else
237 timeout.tv_usec = (curl_timeo % 1000) * 1000;
238 }
239
240 /* get file descriptors from the transfers */
241 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
242
243 if(mc != CURLM_OK) {
244 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
245 break;
246 }
247
248 /* On success the value of maxfd is guaranteed to be >= -1. We call
249 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
250 no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
251 to sleep 100ms, which is the minimum suggested value in the
252 curl_multi_fdset() doc. */
253
254 if(maxfd == -1) {
255 #ifdef _WIN32
256 Sleep(100);
257 rc = 0;
258 #else
259 /* Portable sleep for platforms other than Windows. */
260 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
261 rc = select(0, NULL, NULL, NULL, &wait);
262 #endif
263 }
264 else {
265 /* Note that on some platforms 'timeout' may be modified by select().
266 If you need access to the original value save a copy beforehand. */
267 rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
268 }
269
270 switch(rc) {
271 case -1:
272 /* select error */
273 break;
274 case 0:
275 default:
276 /* timeout or readable/writable sockets */
277 curl_multi_perform(multi_handle, &still_running);
278 break;
279 }
280 }
281
282 for(i = 0; i < num_transfers; i++) {
283 curl_multi_remove_handle(multi_handle, trans[i].easy);
284 curl_easy_cleanup(trans[i].easy);
285 }
286
287 curl_multi_cleanup(multi_handle);
288
289 return 0;
290 }