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    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2020, 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: #include "test.h"
   23: 
   24: #include "testutil.h"
   25: #include "warnless.h"
   26: #include "memdebug.h"
   27: 
   28: struct transfer_status {
   29:   CURL *easy;
   30:   int halted;
   31:   int counter; /* count write callback invokes */
   32:   int please;  /* number of times xferinfo is called while halted */
   33: };
   34: 
   35: static int please_continue(void *userp,
   36:                            curl_off_t dltotal,
   37:                            curl_off_t dlnow,
   38:                            curl_off_t ultotal,
   39:                            curl_off_t ulnow)
   40: {
   41:   struct transfer_status *st = (struct transfer_status *)userp;
   42:   (void)dltotal;
   43:   (void)dlnow;
   44:   (void)ultotal;
   45:   (void)ulnow;
   46:   if(st->halted) {
   47:     st->please++;
   48:     if(st->please == 2) {
   49:       /* waited enough, unpause! */
   50:       curl_easy_pause(st->easy, CURLPAUSE_CONT);
   51:     }
   52:   }
   53:   fprintf(stderr, "xferinfo: paused %d\n", st->halted);
   54:   return 0; /* go on */
   55: }
   56: 
   57: static size_t header_callback(void *ptr, size_t size, size_t nmemb,
   58:                               void *userp)
   59: {
   60:   size_t len = size * nmemb;
   61:   (void)userp;
   62:   (void)fwrite(ptr, size, nmemb, stdout);
   63:   return len;
   64: }
   65: 
   66: static size_t write_callback(void *ptr, size_t size, size_t nmemb, void *userp)
   67: {
   68:   struct transfer_status *st = (struct transfer_status *)userp;
   69:   size_t len = size * nmemb;
   70:   st->counter++;
   71:   if(st->counter > 1) {
   72:     /* the first call puts us on pause, so subsequent calls are after
   73:        unpause */
   74:     fwrite(ptr, size, nmemb, stdout);
   75:     return len;
   76:   }
   77:   printf("Got %d bytes but pausing!\n", (int)len);
   78:   st->halted = 1;
   79:   return CURL_WRITEFUNC_PAUSE;
   80: }
   81: 
   82: int test(char *URL)
   83: {
   84:   CURL *curls = NULL;
   85:   int i = 0;
   86:   int res = 0;
   87:   struct transfer_status st;
   88: 
   89:   start_test_timing();
   90: 
   91:   memset(&st, 0, sizeof(st));
   92: 
   93:   global_init(CURL_GLOBAL_ALL);
   94: 
   95:   easy_init(curls);
   96:   st.easy = curls; /* to allow callbacks access */
   97: 
   98:   easy_setopt(curls, CURLOPT_URL, URL);
   99:   easy_setopt(curls, CURLOPT_WRITEFUNCTION, write_callback);
  100:   easy_setopt(curls, CURLOPT_WRITEDATA, &st);
  101:   easy_setopt(curls, CURLOPT_HEADERFUNCTION, header_callback);
  102:   easy_setopt(curls, CURLOPT_HEADERDATA, &st);
  103: 
  104:   easy_setopt(curls, CURLOPT_XFERINFOFUNCTION, please_continue);
  105:   easy_setopt(curls, CURLOPT_XFERINFODATA, &st);
  106:   easy_setopt(curls, CURLOPT_NOPROGRESS, 0L);
  107: 
  108:   res = curl_easy_perform(curls);
  109: 
  110: test_cleanup:
  111: 
  112:   curl_easy_cleanup(curls);
  113:   curl_global_cleanup();
  114: 
  115:   if(res)
  116:     i = res;
  117: 
  118:   return i; /* return the final return code */
  119: }