<?
  $what = $_GET['what'];
  if ($what == 'dds')
  {
    $what = 'SmartCircle-DisplayDS-';
  }
  else if ($what == 'rds')
  {
    $what = 'SmartCircle-RemoteDS-';
  }
  else if ($what == 'manager')
  {
    $what = 'SmartCircle-Manager-';
  }
  else if ($what == 'display')
  {
    $what = 'SmartCircle-Display-';
  }
  else if ($what == 'display-m')
  {
    $what = 'SmartCircle-Display-';
  }
  else if ($what == 'rdm')
  {
    $what = 'SmartCircle-RDM-';
  }
  else if ($what == 'rm')
  {
    $what = 'SmartCircle-RM-';
  }
  else if ($what == 'gms')
  {
    $what = 'Google_Play_services--com.google.android.gms-';
  }
  else if ($what == 'qr')
  {
    $what = 'qr';
  }
  else
  {
    die('Incorrect call.');
  }
  
  $files = scandir('.');
  //print_r($files);
  
  $ts = 0;
  $found = '';
  
  $len = strlen($what);
  foreach($files as $file)
  {
    if (substr($file, 0, $len) == $what)
    {
      if ($ts == 0 || filemtime('./'.$file) > $ts)
      {
        $found = $file;
        $ts = filemtime('./'.$file);
        //echo($file.' '.$ts);
      }
    }
  }
  
  if ($found == '')
  {
    die('Cannot find version.');
  }
  
  header('Content-Description: File Transfer');
  header('Content-Type: application/octet-stream');
  header('Content-Disposition: attachment; filename='.$found);
  header('Expires: 0');
  header('Cache-Control: must-revalidate');
  header('Pragma: public');
  header('Content-Length: '.filesize('./'.$found));
  
  readfile('./'.$found);
?>