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https://issues.apache.org/jira/browse/PDFBOX-2250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14109074#comment-14109074
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Timo Boehme commented on PDFBOX-2250:
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[~tilman] your patch will treat an object from the xref table with offset 0
equally to a non-declared object id - a null object. While on the one hand
for a (C) programmer this might be obvious (0==null) this is not part of the
PDF specification (at least I couldn't found it). Furthermore with the ongoing
xref offset healing project we try to find the correct offset for an object id
- this would be prevented with treating it like a null object only because
it happens to have offset 0 and not another wrong offset. Thus I'm not sure if
this patch is a good idea. On the other hand offset 0 will be wrong in any case
(assuming the required header) and quite seldom thus if we have a document
which can be cured by this patch it might be ok.
> Improve XRef self healing mechanism
> -----------------------------------
>
> Key: PDFBOX-2250
> URL: https://issues.apache.org/jira/browse/PDFBOX-2250
> Project: PDFBox
> Issue Type: Improvement
> Components: Parsing
> Affects Versions: 1.8.6, 1.8.7, 2.0.0
> Reporter: Andreas Lehmkühler
> Assignee: Andreas Lehmkühler
> Attachments: PDFBOX-2250-107425-empty-xref.pdf,
> PDFBOX-2250-110264-xref-zeronumber.pdf
>
>
> PDFBOX-1769 introduced a "self healing" mechanism to repair corrupt XRef
> offsets. But that one was just a starter and there remain a lot of issues to
> be solved. I'm planing to solve at least some of them.
> All fixes and improvements are targeting the non-sequential parser and I
> won't port those changes to the old parser.
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