[Bug 6415] New: windows web server app fails to send more than 11680 bytes !?

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=6415

           Summary: windows web server app fails to send more than 11680
                    bytes !?
           Product: Wine
           Version: 0.9.22.
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-net
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: idc-dragon at gmx.de


I'm testing a windows app I'd very much like to run under Wine being in touch 
with the author. This is a small web server app (called WRC, for web remote 
center) based on the Microsoft MFC sample app HTTPSVR. It happily works under 
Windows, but that'd be the wrong thing for running it 24/7.  ;-)

It's not yet working under Wine, fails to serve larger files, but we've pretty 
much narrowed down the problem by adding logs to the app and using ethereal.

For example, the app tries to write a 25017 bytes .jpg image to the socket, but 
the socket only allows 11680 bytes at a time, and the TCP stack fragments this 
in 8 packets of 1460 bytes, presumably because it only has 8 buffers reserved. 
So far so good.

We see them being sent on the Ethernet and the ACK's are coming in, but 
after these 8 packets there should be a signal to trigger the OnSend 
function of the app so it can send the next part of data, but this never 
happens... The reselection of the socket did not return an error. Given the 
reselection is ok, and at the Ethernet level messages are consistently sent and 
ACK's received, the conclusion is that there might be a bug in Wine. So here we 
are stuck.

The error is very simple, WRC server processes a request and builds a response 
in a memory buffer called m_buf (member of CRequestSocket).

In case an image is requested it will realloc the buffer and read the complete 
image into the buffer, setting m_cbOut to the number of bytes in m_buf which 
are to be sent.

After this the AsyncSelect( FD_WRITE | FD_CLOSE ) member of CRequestSocket is 
called to initiate the writing of data to the network, this in done by 
MFC/Windows calling the OnSend member whenever the underlying socket is able to 
handle data.

In this function we send data and check for an error, a partial send or a 
complete send. Every time a partial send is completed the AsyncSelect( FD_WRITE 
| FD_CLOSE ) is repeated so MFC/Windows will get back to us when data is sent 
on the network, and this seems to fail.

So have a look at the code in "if ( nBytes < m_cbOut )", this is what is being 
executed when we see that only 11680 of the 25017 bytes are sent.

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