!752

static boolean actualCopy = true;
static int maxCopy = 1024*1024*1024;

p {
  File dest = new File("/home/stefan/Downloads/Brilliance.mp4");
  //print(bytesToHex(firstBytesOfFile(dest, 10)));
  int downloaded = (int) dest.length();
  print("Existing: " + downloaded);
  
  URL url = new URL("http://cdl37.convert2mp3.net/download.php?id=youtube_pvcsa2ZesZY&key=bV7xjw9SuB4X&d=y");
  
  HttpURLConnection connection = (HttpURLConnection) url.openConnection();
  
  connection.setRequestProperty("Range", "bytes=" + downloaded + "-");
  
  InputStream in = connection.getInputStream();
  try {
    print("Length: " + connection.getContentLength());
    int status = connection.getResponseCode();
    print("Code: " + status);
    if (status != HttpURLConnection.HTTP_PARTIAL)
      fail("No partial download possible!");
    
    if (actualCopy) {
      FileOutputStream fos = new FileOutputStream(dest, true); // append
      
      print("Copied: " + copyStream(downloaded, downloaded+maxCopy, in, fos));
      fos.close();
    } else {
      new ByteArrayOutputStream bos;
      print("Tested: " + copyStream(downloaded, downloaded+10, in, bos));
      byte[] bytes = bos.toByteArray();
      print(bytesToHex(subArray(bytes, 0, 10)));
    }
  } finally {    
    in.close();
  }
}  

static long copyStream(int downloaded, long maxDownload, InputStream in, OutputStream out) ctex {
  byte[] buf = new byte[65536];
  long total = downloaded;
  while (total < maxDownload) {
    int n = in.read(buf);
    if (n <= 0) return total;
    out.write(buf, 0, n);
    total += n;
    print("Downloaded: " + toK(total) + " K");
  }
  ret total;
}

static byte[] subArray(byte[] b, int start, int end) {
  byte[] x = new byte[end-start];
  System.arraycopy(b, start, x, 0, end-start);
  ret x;
}