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From: amu@MIT.EDU (Aaron M. Ucko)
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Subject: Re: Unintended base64 encoding
Date: 09 Jul 1999 15:43:27 -0400
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Lars Magne Ingebrigtsen <larsi@gnus.org> writes:

> Seems nice.  I've now written the function, but what is the switchover
> point between qp and base64?  Math genius wanted!

*raises hand* Ooh, ooh, call on me!

QP adds an overhead of roughly 2 characters per non-ASCII character.
("Roughly" because the line-wrapping stuff makes that number slightly
off.)  On the other hand, base64 always adds an overhead of 1/3
character per character.  The breakeven point occurs when these
overheads are equal; i.e., when about 1/6 of the characters are non-ASCII.

-- 
Aaron M. Ucko, KB1CJC <amu@mit.edu> (finger amu@monk.mit.edu)