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https://issues.apache.org/jira/browse/PDFBOX-6154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18054353#comment-18054353
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Tilman Hausherr edited comment on PDFBOX-6154 at 1/26/26 7:20 PM:
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The specification doesn't clearly explain what to do with the HSKIP bitmap,
however it links it to GSKIP, and later to SKIP, and later to USESKIP. And that
one is found (inactive / not implemented) in the code in GenericRegion.java.
The commented code there isn't helpful. We have to get into deep down in
{{decodeLine()}} and {{decodeTemplateXX()}} and find the places where the bits
are computed, and then skip single bits instead of reading. I did this and the
Index exceptions were gone, however some of the bitmaps gathered look like
trash, and the final result image is empty.
was (Author: tilman):
The specification doesn't clearly explain what to do with the HSKIP bitmap,
however it links it to GSKIP, and later to SKIP, and later to USESKIP. And that
one is found (inactive / not implemented) in the code in GenericRegion.java.
> HENABLESKIP isn't supported
> ---------------------------
>
> Key: PDFBOX-6154
> URL: https://issues.apache.org/jira/browse/PDFBOX-6154
> Project: PDFBox
> Issue Type: Sub-task
> Components: JBIG2
> Affects Versions: 3.0.4 JBIG2
> Reporter: Tilman Hausherr
> Priority: Minor
> Attachments: 1769433802492.png
>
>
> This is described in "6.6.5.1 Computing HSKIP". I managed to implement the
> bitmap but not yet to do anything with it. Until this is fully implemented we
> should throw an IOException instead of letting an IOOB happen.
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