/*****************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 *
 * Example source code to show how the callback function can be used to
 * download data into a chunk of memory instead of storing it in a file.
 * After successful download we use curl_easy_getinfo() calls to get the
 * amount of downloaded bytes, the time used for the whole download, and
 * the average download speed.
 * On Linux you can create the download test files with:
 * dd if=/dev/urandom of=file_1M.bin bs=1M count=1
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>

#define URL_BASE "http://speedtest.your.domain/"
#define URL_1M   URL_BASE "file_1M.bin"
#define URL_2M   URL_BASE "file_2M.bin"
#define URL_5M   URL_BASE "file_5M.bin"
#define URL_10M  URL_BASE "file_10M.bin"
#define URL_20M  URL_BASE "file_20M.bin"
#define URL_50M  URL_BASE "file_50M.bin"
#define URL_100M URL_BASE "file_100M.bin"

#define CHKSPEED_VERSION "1.0"

static size_t WriteCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
  /* we are not interested in the downloaded bytes itself,
     so we only return the size we would have saved ... */
  (void)ptr;  /* unused */
  (void)data; /* unused */
  return (size_t)(size * nmemb);
}

int main(int argc, char *argv[])
{
  CURL *curl_handle;
  CURLcode res;
  int prtsep = 0, prttime = 0;
  const char *url = URL_1M;
  char *appname = argv[0];

  if (argc > 1) {
    /* parse input parameters */
    for (argc--, argv++; *argv; argc--, argv++) {
      if (strncasecmp(*argv, "-", 1) == 0) {
        if (strncasecmp(*argv, "-H", 2) == 0) {
          fprintf(stderr,
                  "\rUsage: %s [-m=1|2|5|10|20|50|100] [-t] [-x] [url]\n",
                  appname);
          exit(1);
        } else if (strncasecmp(*argv, "-V", 2) == 0) {
          fprintf(stderr, "\r%s %s - %s\n",
                  appname, CHKSPEED_VERSION, curl_version());
          exit(1);
        } else if (strncasecmp(*argv, "-X", 2) == 0) {
          prtsep = 1;
        } else if (strncasecmp(*argv, "-T", 2) == 0) {
          prttime = 1;
        } else if (strncasecmp(*argv, "-M=", 3) == 0) {
          long m = strtol((*argv)+3, NULL, 10);
          switch(m) {
            case   1: url = URL_1M;
                      break;
            case   2: url = URL_2M;
                      break;
            case   5: url = URL_5M;
                      break;
            case  10: url = URL_10M;
                      break;
            case  20: url = URL_20M;
                      break;
            case  50: url = URL_50M;
                      break;
            case 100: url = URL_100M;
                      break;
            default:  fprintf(stderr, "\r%s: invalid parameter %s\n",
                              appname, *argv + 3);
                      exit(1);
          }
        } else {
          fprintf(stderr, "\r%s: invalid or unknown option %s\n",
                  appname, *argv);
          exit(1);
        }
      } else {
        url = *argv;
      }
    }
  }

  /* print separator line */
  if (prtsep) {
    printf("-------------------------------------------------\n");
  }
  /* print localtime */
  if (prttime) {
    time_t t = time(NULL);
    printf("Localtime: %s", ctime(&t));
  }

  /* init libcurl */
  curl_global_init(CURL_GLOBAL_ALL);

  /* init the curl session */
  curl_handle = curl_easy_init();

  /* specify URL to get */
  curl_easy_setopt(curl_handle, CURLOPT_URL, url);

  /* send all data to this function  */
  curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteCallback);

  /* some servers don't like requests that are made without a user-agent
     field, so we provide one */
  curl_easy_setopt(curl_handle, CURLOPT_USERAGENT,
                   "libcurl-speedchecker/" CHKSPEED_VERSION);

  /* get it! */
  res = curl_easy_perform(curl_handle);

  if(CURLE_OK == res) {
    double val;

    /* check for bytes downloaded */
    res = curl_easy_getinfo(curl_handle, CURLINFO_SIZE_DOWNLOAD, &val);
    if((CURLE_OK == res) && (val>0))
      printf("Data downloaded: %0.0f bytes.\n", val);

    /* check for total download time */
    res = curl_easy_getinfo(curl_handle, CURLINFO_TOTAL_TIME, &val);
    if((CURLE_OK == res) && (val>0))
      printf("Total download time: %0.3f sec.\n", val);

    /* check for average download speed */
    res = curl_easy_getinfo(curl_handle, CURLINFO_SPEED_DOWNLOAD, &val);
    if((CURLE_OK == res) && (val>0))
      printf("Average download speed: %0.3f kbyte/sec.\n", val / 1024);

  } else {
    fprintf(stderr, "Error while fetching '%s' : %s\n",
            url, curl_easy_strerror(res));
  }

  /* cleanup curl stuff */
  curl_easy_cleanup(curl_handle);

  /* we're done with libcurl, so clean it up */
  curl_global_cleanup();

  return 0;
}