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Jonas Jenwald 56a43a3181 Make XRef_indexObjects more robust against bad PDF files (issue 5752)

This patch improves the detection of `xref` in files where it is followed by an arbitrary whitespace character (not just a line-breaking char).
It also adds a check for missing whitespace, e.g. `1 0 obj<<`, to speed up `readToken` for the PDF file in the referenced issue.
Finally, the patch also replaces a bunch of magic numbers with suitably named constants.

Fixes 5752.

Also improves 6243, but there are still issues.

2015-08-21 20:33:02 +02:00

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