Review Request: [PATCH] Make the FTP ioslave emit mime-type of the content before actually reading it

[David Faure]

> On April 18, 2011, 8:31 p.m., David Faure wrote:
> > kioslave/ftp/ftp.cpp, line 2405
> > <http://git.reviewboard.kde.org/r/101149/diff/3/?file=14732#file14732line2405>
> >
> >     If m_size is UnknownSize and the file is less than 1024 bytes, this code is going to hit the timeout, waiting for data to come in, that will never come in.
> >     
> >     I think that once waitForReadyRead was called once, the loop should break (after peeking, of course), if m_size==Unknown.
> 
> Dawit Alemayehu wrote:
>     That won't happen because we also check the returned size of peek:
>     
>     if (bytesRead == 0 || bytesLeft == 0) {
>         break;
>     }
>     
>     so if the file size is < 1024, but m_size is unknown then the entire file the loop will break once it reads the entire file from buffer. I already tested that this works with our trusty README file of 404 bytes from the KDE ftp site.
> 
> David Faure wrote:
>     Sorry, I don't get it. m_size=1024 (because unknown), real file size=404, bytesRead=404, bytesLeft=620 -> no break -> we go to "waitForReadyRead" until timeout.
> 
> Dawit Alemayehu wrote:
>     See new patch. I now handle that case too ; so you won't get the extra timeout condition. If bytesRead == totalSize (which is really the size we want), the it will break. Sorry about misreading your response. I thought you said it will be in an infinite loop. :)

Nope, if m_size is UnknownSize, then we don't know the size we want. 1024 might be impossible to ever reach.
The new code makes sense, except in the case where m_size == UnknownSize. In that case, you need to break at the bottom of the while loop, I don't see another solution.


- David


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On April 18, 2011, 9:28 p.m., Dawit Alemayehu wrote:
> 
> -----------------------------------------------------------
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> http://git.reviewboard.kde.org/r/101149/
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> 
> (Updated April 18, 2011, 9:28 p.m.)
> 
> 
> Review request for kdelibs and David Faure.
> 
> 
> Summary
> -------
> 
> The attached patch changes the ftpGet function such that it emits the mime-type of the content it is about to read, before starting to read it. That way kio_ftp will work correctly if and when it is put on hold to be reused from another application. Note that the patch uses QIODevice::peek to achieve this goal.
> 
> 
> Diffs
> -----
> 
>   kioslave/ftp/ftp.h 9814c10 
>   kioslave/ftp/ftp.cpp 64f43d8 
> 
> Diff: http://git.reviewboard.kde.org/r/101149/diff
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> Dawit
> 
>

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