Current File : //opt/cpanel/libcurl/share/doc/ea-libcurl-devel/http2-download.c
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
/* <DESC>
* Multiplexed HTTP/2 downloads over a single connection
* </DESC>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/* somewhat unix-specific */
#include <sys/time.h>
#include <unistd.h>
/* curl stuff */
#include <curl/curl.h>
#include <curl/mprintf.h>
#ifndef CURLPIPE_MULTIPLEX
/* This little trick will just make sure that we do not enable pipelining for
libcurls old enough to not have this symbol. It is _not_ defined to zero in
a recent libcurl header. */
#define CURLPIPE_MULTIPLEX 0
#endif
struct transfer {
CURL *easy;
unsigned int num;
FILE *out;
};
#define NUM_HANDLES 1000
static
void dump(const char *text, int num, unsigned char *ptr, size_t size,
char nohex)
{
size_t i;
size_t c;
unsigned int width = 0x10;
if(nohex)
/* without the hex output, we can fit more on screen */
width = 0x40;
fprintf(stderr, "%d %s, %lu bytes (0x%lx)\n",
num, text, (unsigned long)size, (unsigned long)size);
for(i = 0; i<size; i += width) {
fprintf(stderr, "%4.4lx: ", (unsigned long)i);
if(!nohex) {
/* hex not disabled, show it */
for(c = 0; c < width; c++)
if(i + c < size)
fprintf(stderr, "%02x ", ptr[i + c]);
else
fputs(" ", stderr);
}
for(c = 0; (c < width) && (i + c < size); c++) {
/* check for 0D0A; if found, skip past and start a new line of output */
if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
ptr[i + c + 1] == 0x0A) {
i += (c + 2 - width);
break;
}
fprintf(stderr, "%c",
(ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
/* check again for 0D0A, to avoid an extra \n if it's at width */
if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
ptr[i + c + 2] == 0x0A) {
i += (c + 3 - width);
break;
}
}
fputc('\n', stderr); /* newline */
}
}
static
int my_trace(CURL *handle, curl_infotype type,
char *data, size_t size,
void *userp)
{
const char *text;
struct transfer *t = (struct transfer *)userp;
unsigned int num = t->num;
(void)handle; /* prevent compiler warning */
switch(type) {
case CURLINFO_TEXT:
fprintf(stderr, "== %u Info: %s", num, data);
/* FALLTHROUGH */
default: /* in case a new one is introduced to shock us */
return 0;
case CURLINFO_HEADER_OUT:
text = "=> Send header";
break;
case CURLINFO_DATA_OUT:
text = "=> Send data";
break;
case CURLINFO_SSL_DATA_OUT:
text = "=> Send SSL data";
break;
case CURLINFO_HEADER_IN:
text = "<= Recv header";
break;
case CURLINFO_DATA_IN:
text = "<= Recv data";
break;
case CURLINFO_SSL_DATA_IN:
text = "<= Recv SSL data";
break;
}
dump(text, num, (unsigned char *)data, size, 1);
return 0;
}
static void setup(struct transfer *t, int num)
{
char filename[128];
CURL *hnd;
hnd = t->easy = curl_easy_init();
curl_msnprintf(filename, 128, "dl-%d", num);
t->out = fopen(filename, "wb");
if(!t->out) {
fprintf(stderr, "error: could not open file %s for writing: %s\n",
filename, strerror(errno));
exit(1);
}
/* write to this file */
curl_easy_setopt(hnd, CURLOPT_WRITEDATA, t->out);
/* set the same URL */
curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
/* please be verbose */
curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
curl_easy_setopt(hnd, CURLOPT_DEBUGDATA, t);
/* enlarge the receive buffer for potentially higher transfer speeds */
curl_easy_setopt(hnd, CURLOPT_BUFFERSIZE, 100000L);
/* HTTP/2 please */
curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
#if (CURLPIPE_MULTIPLEX > 0)
/* wait for pipe connection to confirm */
curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
#endif
}
/*
* Download many transfers over HTTP/2, using the same connection!
*/
int main(int argc, char **argv)
{
struct transfer trans[NUM_HANDLES];
CURLM *multi_handle;
int i;
int still_running = 0; /* keep number of running handles */
int num_transfers;
if(argc > 1) {
/* if given a number, do that many transfers */
num_transfers = atoi(argv[1]);
if((num_transfers < 1) || (num_transfers > NUM_HANDLES))
num_transfers = 3; /* a suitable low default */
}
else
num_transfers = 3; /* suitable default */
/* init a multi stack */
multi_handle = curl_multi_init();
for(i = 0; i < num_transfers; i++) {
setup(&trans[i], i);
/* add the individual transfer */
curl_multi_add_handle(multi_handle, trans[i].easy);
}
curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
do {
CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
if(still_running)
/* wait for activity, timeout or "nothing" */
mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
if(mc)
break;
} while(still_running);
for(i = 0; i < num_transfers; i++) {
curl_multi_remove_handle(multi_handle, trans[i].easy);
curl_easy_cleanup(trans[i].easy);
}
curl_multi_cleanup(multi_handle);
return 0;
}
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