[jira] [Commented] (PDFBOX-5382) Detect gaps in cross reference table

["Michael Klink (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-5382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17499405#comment-17499405 ] 

Michael Klink commented on PDFBOX-5382:
---------------------------------------

{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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