C source code to extract CP/M ARK archives?

[Tony Duell]

> 
> My point was not information density. My question really was,
> just how self-describing is ASCII? There have been plenty of ways

If you can recognise what constitues a 'character' (trivial on paper tape 
or 9 track magtape, less obvious on bit-serial media like floppy disks), 
and if you assemy there will still be enough ASCII-encoded text around 
that some of it is in a normal human language, then the problem seems to 
reduce to solving a monoalphabetic substitution cipher, which is 
generally not too hard....

-tony