Review Request: Check KFileItem d pointer for validity in KFileItem methods

[David Faure]

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kio/kio/kfileitem.cpp
<http://git.reviewboard.kde.org/r/106902/#comment16137>

    QImage issues a qWarning when calling a setter on a null image, so that developers know that they are doing something wrong. Can you do the same? Well, with kWarning, in kdelibs-4.x.



kio/kio/kfileitem.cpp
<http://git.reviewboard.kde.org/r/106902/#comment16138>

    actually, if both items are null, cmp should return true.



kio/kio/kfileitem.cpp
<http://git.reviewboard.kde.org/r/106902/#comment16139>

    this seems wrong, it's not symmetrical with operator>>, so this will corrupt the stream...
    
    Better stream out an empty url if d==0, and in >>, read into a temp url, and if empty, skip the other fields.


- David Faure


On Oct. 15, 2012, 10:15 p.m., Ignat Semenov wrote:
> 
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> (Updated Oct. 15, 2012, 10:15 p.m.)
> 
> 
> Review request for kdelibs and David Faure.
> 
> 
> Description
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> 
> Check the d pointer for validity since it is set to 0 by the defaut KFileItem ctor.
> 
> Patch based on similar code from QImage.
> 
> I'd like to draw your attention to these issues:
> 
> 1) KFileItem::setUDSEntry()
> For a null KFileItem, this should probably create a new d and initialize it. Ideally, we'd have a dedicated public function to do that (see QImage::create()), but since we can not change the public API (or can we?), I put the new in setUDSEntry(). Anyway, this is now the only interface function that can init a null KFileItem (before the patch, there had been none). All the other set* functions do not new the d, but rather return on d == 0.
> 2) KFileItem::cmp()
> What should this return for a null KFileItem? I return false, but still, it feels wrong to me.
> 3) operator << / operator >>
> << returns "null KFileItem" for d == 0 and >> does nothing, returning the original stream unmodified. operator << thus duplicates the public operator <<(QDebug&).
> 4) This also overrides dfaure's patch for KFileItem::metaInfo(). There is a
> 
> return d->metaInfo()
> 
> at the end of the function, so this can crash as well.
> 
> All the classes' objects that are default-constructed and then returned in the case of d == 0 can be checked for validity, looked it up in the code.
> 
> 
> This addresses bug 299726.
>     http://bugs.kde.org/show_bug.cgi?id=299726
> 
> 
> Diffs
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>   kio/kio/kfileitem.cpp 8ab5a1d 
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> Diff: http://git.reviewboard.kde.org/r/106902/diff/
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> 
> Testing
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> Builds fine.
> 
> 
> Thanks,
> 
> Ignat Semenov
> 
>

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