Review Request 128888: Improve epub extractor, less segfaults

[Christoph Cullmann]

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https://git.reviewboard.kde.org/r/128888/
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Review request for KDE Frameworks and Pinak Ahuja.


Repository: kfilemetadata


Description
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Improve epub extractor:

1) check for more nullpointers (e.g. data can be null for some fields, iterators, ...)
2) actually close the epub file again at all
3) iterator seems to handle clink as stated in docs, fix double free

e.g. see bug 361727
could be the double freed clink in the last iterator

https://bugs.kde.org/show_bug.cgi?id=361727


Diffs
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  src/extractors/epubextractor.cpp 88a4caa 

Diff: https://git.reviewboard.kde.org/r/128888/diff/


Testing
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Unit test still works, no idea how to craft files broken enough to trigger the faults


Thanks,

Christoph Cullmann

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