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Topic: Difference in Cross-Reference
Conf: (P-PDF) Developers, Msg: 52805
From: fabien
Date: 5/29/2002 04:54 PM

Hi,

This is my first post in this forum.

We are creating a PDF/FDF parser in java using the PJ library.
We came across some differences between Acrobat 4.05 Windows and Acrobat 4.05 Mac.

According to the PDF Reference manual version 1.3: one cross-reference table entry is *EXACTLY* 20 bytes long

On Windows they are *19* bytes long!!!! And our parser crashes on that file.

Strangely this file can be read with the Mac version of Acrobat, and If we do a "Save as" the cross-reference entries are 20 bytes long and our parser can successfully decode the file.

Conclusion: In order to parse Windows Acrobat generated PDF file we should:
1) test the length of the cross-reference entry
2) if the length is 19 bytes subtract the number of entries found (i.e. number of missing bytes in the xref) on each offset address in the cross-reference this, for each offset greater than the number of bytes missing in the xref.

Is this a bug or a feature?

Thanks.

Fabien


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