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From: ShengHuo ZHU <zsh@cs.rochester.edu>
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Subject: Re: rfc2047-decode-string
Date: 09 Nov 2000 16:25:06 -0500
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Vladimir Volovich <vvv@vvv.vsu.ru> writes:

> Hi,
> 
> i received a message in which gnus did not decode the subject.
> it looked like:
> 
> Subject: =?koi8-r?B?UmU6IG1zIG9mZmljZSAyMDAwLCDe1M/CIMXHzy4uLg?=
> 
> i think that perhaps the string is not encoded 100% correctly, -- it
> lacks two figns `==' at the end:
> 
> (rfc2047-decode-string "=?koi8-r?B?UmU6IG1zIG9mZmljZSAyMDAwLCDe1M/CIMXHzy4uLg?=")
> "=?koi8-r?B?UmU6IG1zIG9mZmljZSAyMDAwLCDe1M/CIMXHzy4uLg?="
> (rfc2047-decode-string "=?koi8-r?B?UmU6IG1zIG9mZmljZSAyMDAwLCDe1M/CIMXHzy4uLg==?=")
> "Re: ms office 2000, чтоб его..."
> 
> would it be possible, nevertheless, to make rfc2047-decode-string more
> liberal to this sort of `bugs' in encoded-words?

It is because of base64. 

(base64-decode-string "UmU6IG1zIG9mZmljZSAyMDAwLCDe1M/CIMXHzy4uLg")
=> nil 
or
=> error in Emacs 21

(base64-decode-string "UmU6IG1zIG9mZmljZSAyMDAwLCDe1M/CIMXHzy4uLg==")
=> "Re: ...."

In the base64.el, this has been fixed.

Anyway, I've fixed it in rfc2047 by padding the string.

ShengHuo