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https://issues.apache.org/jira/browse/PDFBOX-1653?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christian Kohlschütter updated PDFBOX-1653:
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Attachment: PDFBOX-1653.patch
> Fix pdfbox eating up big chunks of memory for identical mappings
> ----------------------------------------------------------------
>
> Key: PDFBOX-1653
> URL: https://issues.apache.org/jira/browse/PDFBOX-1653
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Affects Versions: 1.8.1, 1.8.2, 2.0.0
> Reporter: Christian Kohlschütter
> Priority: Critical
> Labels: PatchAvailable
> Attachments: PDFBOX-1653.patch
>
>
> pdfbox currently handles the PDF beginbfrange command (which creates a
> character mapping for a range of CIDs to Unicode characters) in a very
> inefficient way.
> If a PDF document contains a range of CID 0 to CID 65535 with a mapping
> offset of 0 (which translates to "CID values map 1:1 to Unicode characters",
> pdfbox would nevertheless map each and every CID.
> There apparently are PDFs with a lot of these 0-65535 mappings, and such a
> single PDF may cause an OutOfMemoryError.
> This patch detects zero-offset ranges and basically just skips them from an
> explicit mapping.
> There is some special handling for the space character included in the patch,
> which might or might not be relevant.
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