PDFsharp & MigraDoc Foundation

PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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PostPosted: Thu Aug 04, 2016 2:26 pm 
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Location: Amsterdam, The Netherlands
What happens:

http://www.stillhq.com/pdfdb/000419/data.pdf (which is corrupt) causes pdfsharp to hang in an infinite loop.

Cause:

A content stream inside 000419.pdf specifies a length that is longer than the file itself.

After reading a stream, pdfsharp will look for the endstream token. This loop does not exit if the file pointer is at or past the end of the file.

Patch:

See attachment. Patch is against PdfSharp 1.50-beta3b.


Attachments:
pdfsharp-670.zip [561 Bytes]
Downloaded 82 times

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Gerben Vos
Developer, ZyLAB Technologies B.V.
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PostPosted: Thu Aug 04, 2016 2:35 pm 
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empira Employee
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Joined: Mon Oct 16, 2006 8:16 am
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Location: Cologne, Germany
Hi!

Thanks for the submission. Changes look good at first glance.

I will give them a close look on Monday.

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Thomas Hoevel
PDFsharp Team


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PostPosted: Thu Aug 04, 2016 3:27 pm 
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We found a few problems while running a huge batch of PDFs from our clients through PdfSharp. For now, these are the most urgent problems we found (having the process hang is pretty terrible). I hope to find some time to look at the remaining problems soon (the LZW decompression bug looks like the worst of those, but there are more).

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Gerben Vos
Developer, ZyLAB Technologies B.V.


Last edited by Gerben Vos on Thu Aug 04, 2016 3:30 pm, edited 1 time in total.

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PostPosted: Thu Aug 04, 2016 3:28 pm 
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In general, I can recommend downloading all of this PDF database and running it through PdfSharp; this should already show up a bunch of problems: http://www.stillhq.com/pdfdb/db.html .

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Gerben Vos
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PostPosted: Tue Aug 16, 2016 12:22 pm 
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empira Employee
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Location: Cologne, Germany
Thanks for the patch and the link to the PDF DB.

That's an interesting file.
Adobe Reader says the file is corrupt and shows an empty page.
The PDF Reader from Windows 10 shows an empty page without complaining.
The Edge that comes with Windows 10 shows a page full with letter "X" without complaining.
Does that mean that Microsoft included two different PDF viewers in Windows 10 that use different code?

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Thomas Hoevel
PDFsharp Team


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