No comment. Sorry.

	private
	parseByteValue readHeader

	accessing	top
	nextImage Read in the next xbm image from the stream.
	understandsImageFormat Test to see if the image stream format is understood by this decoder. This should be implemented in each subclass of ImageReadWriter so that a proper decoder can be selected without ImageReadWriter having to know about all possible image file types.

	private	top
	parseByteValue skip over separators and return next bytevalue parsed as a C language number: 0ddd is an octal digit. 0xddd is a hex digit. ddd is decimal.
	readHeader Set width and height, and position stream at start of bytes

	class initialization	top
	initialize XBMReadWriter initialize