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Re: base64 behavior is not MIME compliant

From: Ken Raeburn
Subject: Re: base64 behavior is not MIME compliant
Date: Tue, 5 Jul 2005 21:15:04 -0400

On Jul 5, 2005, at 18:10, Nic Ferrier wrote:
Why can't you just pre-parse the data parsed to the base64 decoder? I
believe that's the correct behaviour. A base64 decoder should decode
base64, not "base64 but also it does this extra trick if you wave your
hand in the air"

Except "this extra trick" is specifically outlined as an option in the base64 spec (RFC 3548), and MIME invokes that option. So proper "MIME base64 decoding" would require this extra step of throwing away characters that are not part of a base64 encoding, and then making a second pass with the strict base64 decoder. In fact, as I read RFC 3548 section 2.3, the CR/LF line break sequences in MIME messages are not part of the base64 alphabet, and therefore fns.c:IS_BASE64_IGNORABLE already implements a limited form of what Marc is asking for.


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