Does someone have a little ruby script that will read a file in
UTF-8/UTF-16/UTF-32 (my choice) and search for all the characters between
0x7f-0xffffff and convert them to an ASCII digit string that begins with
"&#" and ends with ";" and output the whole thing? If not, could someone
tell me how to write one?

How about a script to do the inverse?

Thanks!
siegfried