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https://issues.apache.org/jira/browse/PDFBOX-5382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17499405#comment-17499405
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Michael Klink commented on PDFBOX-5382:
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{quote}In the SO answer you wrote "gaps with unmapped object numbers are not
allowed"{quote}
But in the first table the object number 5 _is_ mapped: It is mapped into the
free object list. In the second table it is unmapped.
But the PDFBox cross reference {{Map}} ignores free list mappings and only
contains mappings to offsets. (If I understand it correctly, that is.)
> Detect gaps in cross reference table
> ------------------------------------
>
> Key: PDFBOX-5382
> URL: https://issues.apache.org/jira/browse/PDFBOX-5382
> Project: PDFBox
> Issue Type: Improvement
> Components: Signing
> Affects Versions: 2.0.25
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Minor
> Fix For: 2.0.26, 3.0.0 PDFBox
>
>
> Detect PDF files with gaps in the cross reference table because these may
> fail validation in Acrobat Reader, see related SO answer.
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