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pack converts a list into a row of bytes (string) and
unpack does the reverse. These commands get a
conversion string, where the elements to look for are represented
by single characters.
In most cases, a character followed by a number means that many times the
specific type. For instance, i3 means "3 integers".
For strings this is different; A64 means "one string of
64 characters".
In the second unpack example, I had to add three alignment
characters in my format. The undef in the left list works
as a dummy variable: the alignment bytes are just thrown away.
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Created by Mark Overmeer with PPresenter on 5 august 2001.