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这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

DMD bitmap to PostScript translator. Much of the code came from abm,
which was written by Guy Riddle.

By default 6 byte patterns are used to encode the output bitmap. Use
the -b option to change the pattern size. Bitmaps are unpacked one
scanline at a time and re-encoded in a format that looks like,

	bytes patterns count

where bytes and count are decimal integers and patterns is a series
of hex digits. Bytes is the number of bytes represented by the hex
pattern, and count is the number of additional times the pattern
should be repeated. For example,

	2 FFFF 4
	5 FFFFFFFFFF 1
       10 FFFFFFFFFFFFFFFFFFFF 0

all represent 10 consecutive bytes of ones. Scanlines are terminated
by a 0 on a line by itself.