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https://issues.apache.org/jira/browse/PDFBOX-5766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17816580#comment-17816580
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Tilman Hausherr commented on PDFBOX-5766:
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Sadly the "unknown command" can be found only in toString(), when it's already
too late to know what happened. We would have to change all constructors and
getInstance() calls. If you can't share the document, can you extract the font
with PDFDebugger and share that one? Can you reproduce the problem by calling
CFFParser.parse() on the font?
> CharStringCommand-mapping does not work for HintMask-cmd
> --------------------------------------------------------
>
> Key: PDFBOX-5766
> URL: https://issues.apache.org/jira/browse/PDFBOX-5766
> Project: PDFBox
> Issue Type: Bug
> Reporter: Dieter von Holten
> Priority: Minor
>
> i have a (proprietary) document with a licensed font. Opening it in PdfDebug
> shows some 'Unknown-command' messages.
> I could track it down (in glyph-handling) to some HintMask-command(19), which
> is followed by a mask-byte. The attempt to map this to a CharStringCommand
> fails, because it tries to lookup a 2-byte command. There doesn't seem to be
> a way to create a CharStringCommand with additional data.
>
> AddOn: the 'unknown command' log-message should be enhanced to actually show
> the 'unknown command'
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