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https://issues.apache.org/jira/browse/PDFBOX-2250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14109295#comment-14109295
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John Hewson edited comment on PDFBOX-2250 at 8/25/14 4:47 PM:
--------------------------------------------------------------
[~lehmi], the spec says that, but the [Adobe Supplement to the ISO
32000|http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/adobe_supplement_iso32000.pdf],
which describes Acrobat's behaviour, adds that:
{quote}
Acrobat viewers require only that the header appear somewhere within the first
1024 bytes of the file.
{quote}
Such PDFs are not unheard of, PDFParser#parseHeader() contains code which scans
the PDF for the header (although it doesn't limit to 1024 bytes and contains
some misleading comments).
was (Author: jahewson):
[~lehmi], the spec says that, but the[ Adobe Supplement to the ISO
32000|http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/adobe_supplement_iso32000.pdf,
which describes Acrobat's behaviour, adds that:
{quote}
Acrobat viewers require only that the header appear somewhere within the first
1024 bytes of the file.
{quote}
Such PDFs are not unheard of, PDFParser#parseHeader() contains code which scans
the PDF for the header (although it doesn't limit to 1024 bytes and contains
some misleading comments).
> 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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