Re: base64

["Lothar Kimmeringer" <bugtraq@xxxxxxxxxxxxxx>]

On Tue, 23 Sep 2003 12:18:31 -0400 (EDT), Birl wrote:

>Excuse my ignorance.  I tried to pook around some B64 attachements in my
>email files for an answer.
>
>
>Are you stating that an =
>
>1) should not appear in B64 at all
>2) should not appear in the middle of a line, but only at the EOLN
>3) should only appear at the end of a B64 file

See the corresponding RFC. The number of characters in a base64-coded
text must be a multiply of 4. So ='s are used if there aren't enough
characters and are added at the end of the text.

= is not a valid character inside Base64 and an encoder should stop
with an error or stops decoding.

>Answering that question could help me better determine how to write a
>procmail filter for this.

/.*=[^=]/
(untested)


Regards, Lothar

-- 
Lothar Kimmeringer                E-Mail: mailbody@xxxxxxxxxxxxxx
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