/**
  * Method used to decode the body of a MIME encoded message.
  *
  * @access  public
  * @param   string $input The full body of the message
  * @param   string $encoding The encoding used in the message
  * @return  string The decoded message body
  */
 function decodeBody($input, $encoding = '7bit')
 {
     switch ($encoding) {
         case '7bit':
             return $input;
             break;
         case 'quoted-printable':
             return Mime_Helper::_quotedPrintableDecode($input);
             break;
         case 'base64':
             return base64_decode($input);
             break;
         default:
             return $input;
     }
 }