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Unfortunately as of Debian Wheezy it doesn't work for Dovecot with
COMPRESS=DEFLATE [RFC4978] and non-synchronizing literals.
perl -e 'use Compress::Raw::Zlib;
print "a COMPRESS DEFLATE\r\n";
sleep 1;
my $d = new Compress::Raw::Zlib::Deflate( -WindowBits => -15 );
$d->deflate("b APPEND TRASH ~{1+}\r\nx\r\n", my $buf);
print $buf;
$d->flush($buf, Z_SYNC_FLUSH);
print $buf;
sleep 1;
' | /usr/lib/dovecot/imap
imap(guilhem): Panic: stream doesn't support seeking backwards
Interestingly, it works just fine for non-binary literals:
perl -e 'use Compress::Raw::Zlib;
print "a COMPRESS DEFLATE\r\n";
sleep 1;
my $d = new Compress::Raw::Zlib::Deflate( -WindowBits => -15 );
$d->deflate("b APPEND TRASH {1+}\r\nx\r\n", my $buf);
print $buf;
$d->flush($buf, Z_SYNC_FLUSH);
print $buf;
sleep 1;
' | /usr/lib/dovecot/imap
However I can't reproduce the problem Dovecot 2.2.18 and Debian Sid (but
it doesn't help to install Dovecot from testing to my Wheezy box.)
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