[Dovecot] Bug with partial IMAP fetches

[Timo Sirainen]

On Tuesday, Nov 4, 2003, at 21:10 Europe/Helsinki, Matthew Reimer wrote:

> I think I've found the bug. The attached patch fixes the problem for 
> me. The first problem is that the wrong value is being returned by 
> message_send() because ret is getting set to the wrong value (see 
> above or patch). The second problem is that in the special case where 
> physical_size == virtual_size (i.e., sendfile can be used) 
> i_stream_skip(input, virtual_skip) is being called on the input 
> stream. This is wrong because virtual_skip is supposed to indicate 
> that \r was the last character seen and therefore \n needs to be sent 
> before any of the input stream; but in the sendfile case this is not 
> necessary.
>
> I think a little refactoring of seek_partial(), message_send() and 
> message_skip_virtual() might be helpful to clarify the code. The 
> virtual_skip argument to message_send() is an off_t but is only used 
> to indicate that \r was the last character read, so it would probably 
> be more clear to add another argument cr_skipped (like 
> message_skip_virtual()). Better might be to put all the partial cache 
> stuff in message-send.c.

It actually was supposed to be skip byte count, not just CR-indicator. 
But you're right, it was used wrong in sendfile code path. There was 
one piece of code anymore which used the virtual_skip more than just 
for CR (BODY[HEADER]<..>) and it was easy to change. I think the 
attached patch should fix it properly.

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