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https://issues.apache.org/jira/browse/PDFBOX-2250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14109343#comment-14109343
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John Hewson edited comment on PDFBOX-2250 at 8/25/14 5:27 PM:
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Allowing "rubbish in front of the file header" is _almost_ the same construct,
as even in malformed documents the header is usually at the beginning of a
line. The end result is the same though: we do allow an object at offset 0.
It's not clear whether the Adobe supplement means for objects at offset 0 to be
legal or not, I guess the real question is whether or not such documents exist.
I'm fairly skeptical, as you say it's usually "rubbish" which is at the start
of a malformed file.
was (Author: jahewson):
Allowing "rubbish in front of the file header" is _almost_ the same construct,
as even in malformed documents the header is usually at the beginning of a
line. The end result is the same though: we do allow an object at offset 0.
> 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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