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From: d88-jwa@byse.nada.kth.se (Jon W{tte)
Newsgroups: comp.compression
Subject: Re: COMPRESSING of binary data into mailable ASCII
     Re: Encoding of binary data into mailable ASCII
Message-ID: <D88-JWA.91Mar26132859@byse.nada.kth.se>
Date: 26 Mar 91 12:29:10 GMT
References: <D88-JWA.91Mar24223223@byse.nada.kth.se>
	<1991Mar26.024425.5621@zorch.SF-Bay.ORG>
Sender: news@nada.kth.se (Mr News)
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Organization: Royal Institute of Technology, Stockholm, Sweden
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In-reply-to: xanthian@zorch.SF-Bay.ORG's message of 26 Mar 91 02:44:25 GMT

In article <> xanthian@zorch.SF-Bay.ORG (Kent Paul Dolan) writes:

   Was that mine?  It seems like  months since I remember putting that
   claim up.

Nope. It was recent. I talked to the author via mail, but wanted to
point this out to the group.

   Does btoa really only use base _eighty_-five? Doesn't look like it could
   and still be that close to my a.e. solution in efficiency. A typo,
   perhaps?

No. 85^5 > 256^4 (try it yourself !) This results in an axpansion of
20%, just a little bit more than the theoretical base-9[56] coder.
That's logarithms at work for you ! :-)

The nice thing about base 85 is that you can choose the character set
to exclude certain ill-behaving characters (notably tilde (in cu) and
spce (as in the BSD tty driver :-))

							h+@nada.kth.se
							Jon W{tte
--
"The IM-IV file manager chapter documents zillions of calls, all of which
seem to do almost the same thing and none of which seem to do what I want
them to do."  --  Juri Munkki in comp.sys.mac.programmer