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Diffstat (limited to 'docs/examples/http2-download.c')
| -rw-r--r-- | docs/examples/http2-download.c | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/docs/examples/http2-download.c b/docs/examples/http2-download.c new file mode 100644 index 00000000..3b7ca81d --- /dev/null +++ b/docs/examples/http2-download.c @@ -0,0 +1,288 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2015, 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 http://curl.haxx.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. + * + ***************************************************************************/ +#include <stdio.h> +#include <stdlib.h> + +/* somewhat unix-specific */ +#include <sys/time.h> +#include <unistd.h> + +/* curl stuff */ +#include <curl/curl.h> + +#ifndef CURLPIPE_MULTIPLEX +/* This little trick will just make sure that we don't 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 + +#define NUM_HANDLES 1000 + +void *curl_hnd[NUM_HANDLES]; +int num_transfers; + +/* a handle to number lookup, highly ineffective when we do many + transfers... */ +static int hnd2num(CURL *hnd) +{ + int i; + for(i=0; i< num_transfers; i++) { + if(curl_hnd[i] == hnd) + return i; + } + return 0; /* weird, but just a fail-safe */ +} + +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, %ld bytes (0x%lx)\n", + num, text, (long)size, (long)size); + + for(i=0; i<size; i+= width) { + + fprintf(stderr, "%4.4lx: ", (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; + int num = hnd2num(handle); + (void)handle; /* prevent compiler warning */ + (void)userp; + switch (type) { + case CURLINFO_TEXT: + fprintf(stderr, "== %d Info: %s", num, data); + 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(CURL *hnd, int num) +{ + FILE *out; + char filename[128]; + + sprintf(filename, "dl-%d", num); + + out = fopen(filename, "wb"); + + /* write to this file */ + curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out); + + /* set the same URL */ + curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html"); + + /* send it verbose for max debuggaility */ + curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L); + curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace); + + /* HTTP/2 please */ + curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0); + + /* we use a self-signed test server, skip verification during debugging */ + curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L); + curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L); + +#if (CURLPIPE_MULTIPLEX > 0) + /* wait for pipe connection to confirm */ + curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L); +#endif + + curl_hnd[num] = hnd; +} + +/* + * Simply download two files over HTTP/2, using the same physical connection! + */ +int main(int argc, char **argv) +{ + CURL *easy[NUM_HANDLES]; + CURLM *multi_handle; + int i; + int still_running; /* keep number of running handles */ + + if(argc > 1) + /* if given a number, do that many transfers */ + num_transfers = atoi(argv[1]); + + if(!num_transfers || (num_transfers > NUM_HANDLES)) + num_transfers = 3; /* a suitable low default */ + + /* init a multi stack */ + multi_handle = curl_multi_init(); + + for(i=0; i<num_transfers; i++) { + easy[i] = curl_easy_init(); + /* set options */ + setup(easy[i], i); + + /* add the individual transfer */ + curl_multi_add_handle(multi_handle, easy[i]); + } + + curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX); + + /* we start some action by calling perform right away */ + curl_multi_perform(multi_handle, &still_running); + + do { + struct timeval timeout; + int rc; /* select() return code */ + CURLMcode mc; /* curl_multi_fdset() return code */ + + fd_set fdread; + fd_set fdwrite; + fd_set fdexcep; + int maxfd = -1; + + long curl_timeo = -1; + + FD_ZERO(&fdread); + FD_ZERO(&fdwrite); + FD_ZERO(&fdexcep); + + /* set a suitable timeout to play around with */ + timeout.tv_sec = 1; + timeout.tv_usec = 0; + + curl_multi_timeout(multi_handle, &curl_timeo); + if(curl_timeo >= 0) { + timeout.tv_sec = curl_timeo / 1000; + if(timeout.tv_sec > 1) + timeout.tv_sec = 1; + else + timeout.tv_usec = (curl_timeo % 1000) * 1000; + } + + /* get file descriptors from the transfers */ + mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); + + if(mc != CURLM_OK) + { + fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); + break; + } + + /* On success the value of maxfd is guaranteed to be >= -1. We call + select(maxfd + 1, ...); specially in case of (maxfd == -1) there are + no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- + to sleep 100ms, which is the minimum suggested value in the + curl_multi_fdset() doc. */ + + if(maxfd == -1) { +#ifdef _WIN32 + Sleep(100); + rc = 0; +#else + /* Portable sleep for platforms other than Windows. */ + struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ + rc = select(0, NULL, NULL, NULL, &wait); +#endif + } + else { + /* Note that on some platforms 'timeout' may be modified by select(). + If you need access to the original value save a copy beforehand. */ + rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); + } + + switch(rc) { + case -1: + /* select error */ + break; + case 0: + default: + /* timeout or readable/writable sockets */ + curl_multi_perform(multi_handle, &still_running); + break; + } + } while(still_running); + + curl_multi_cleanup(multi_handle); + + for(i=0; i<num_transfers; i++) + curl_easy_cleanup(easy[i]); + + return 0; +} |