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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: Large *.pif base64 attachments and Gnus...
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Florian Weimer <fw@deneb.enyo.de> writes:

>> Committed.  If `base64-decode-region' is broken in Emacs 20 it doesn't
>> help though.
>
> I finally managed to look at the documentation, and it's strange
> behavior is even documented:
>
> | Base64-decode the region between BEG and END.
> | Return the length of the decoded text.
> | If the region can't be decoded, return nil and don't modify the buffer.
>
> Is this different on Emacs 21?

Yes.  I think the current code should work with both schemes.

base64-decode-region is an interactive built-in function.
(base64-decode-region BEG END)

Base64-decode the region between BEG and END.
Return the length of the decoded text.
If the region can't be decoded, signal an error and don't modify the buffer.