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

[Commit Hook]

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This review has been submitted with commit 0b8942128aafe59d7ffef17cef28419c30cbf684 by Ignat Semenov to branch KDE/4.9.

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On Oct. 16, 2012, 4:22 p.m., Ignat Semenov wrote:
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> (Updated Oct. 16, 2012, 4:22 p.m.)
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> 
> Review request for kdelibs and David Faure.
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> Description
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> Check the d pointer for validity since it is set to 0 by the defaut KFileItem ctor.
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> Patch based on similar code from QImage.
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> I'd like to draw your attention to these issues:
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> 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
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> return d->metaInfo()
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> at the end of the function, so this can crash as well.
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> 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.
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> This addresses bug 299726.
>     http://bugs.kde.org/show_bug.cgi?id=299726
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> 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.
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> Thanks,
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> Ignat Semenov
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