Ping ... ?
I don't want to annoy anyone, but I didn't receive any responses, not even
an "I don't know" or "We don't have time for that right now".
Right now I have three pdfs all with the same loading error, and all have
been created with an Adobe/Acrobat application (Adobe PDF Library 10.0.1,
Acrobat Distiller 10.1.12 (Windows), Acrobat Distiller 8.1.0 (Windows)).
Clearly Podofo fails to open some perfectly valid pdf files.
Regards,
F.E.
2018-02-22 9:55 GMT+01:00 F. E. <exler7...@gmail.com>:
> Hello dear podofo users,
>
> today i stumbled upon a parsing bug in PdfTokenizer::ReadDictionary. With
> SVN revision 1794, a check was added to prevent a signature content stream
> from being decrypted by comparing the dictionary type to "Sig". But this
> requires the type to be known/parsed beforehand, otherwise the dictionary
> doesn't contain the type (yet). Consequently, if you have a pdf file where
> the '/Type/Sig' is declared after the signature content, the check does not
> work and the signature content gets decrypted, which in my case ultimately
> prevented the pdf file from being loaded successfully. When I prevented the
> decryption during debugging, the pdf file was loaded successfully.
>
> I consulted the pdf reference for this issue, but couldn't find any
> indication that the dictionary type has to be specified before the
> signature content occurs, my test pdf should be perfectly valid. So podofo
> needs to be fixed. I tried to analyze the code and a possible solution /
> workaround, but I'm not feeling confident & competent enough to come up
> with a good, working patch.
>
> Regards,
> F.E.
>
>
>
>
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