[Dovecot] Sieve, vacation, variables and russian language

[Timo Sirainen]

On Fri, 2009-09-11 at 18:05 -0400, Timo Sirainen wrote:
> I think the main reason this hasn't been implemented yet is that this
> conversion isn't required anywhere else in Dovecot. So the first step
> would be to create RFC 2047 encoder for Dovecot. Feel free to implement
> one. :)

Well, I actually spent some time writing the code anyway. Not tested at
all currently. I started writing unit tests but it didn't get very far.
I'm not really sure what kind of decisions I should use to figure out
where to start/end the encoded words or when to use base64 instead of
q-p. Currently it uses:

 - if only one word has non-ascii, encode only that word. otherwise
encode the whole string.
 - if more than 1/3 of string has non-ascii characters, use base64.

Attached a patch for it. Of course you'd still need to change Sieve to
use it.
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