def METHOD_NAME(self, line):
    """
    Called from the `read` Method of this stream with each line read from `self.input_stream`.
    By returning ``None`` the line will not be returned from the read stream, effectively being stripped from the
    wrapper `input_stream`.
    Arguments:
        line (bytes): The line as read from `self.input_stream` in byte representation
    Returns:
        bytes or None: The processed version of the line (might also be multiple lines), or None if the line is to be
            stripped from the processed stream.
    """
    return line