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https://issues.apache.org/jira/browse/PDFBOX-6004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17950291#comment-17950291
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Tilman Hausherr commented on PDFBOX-6004:
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Sorry but I'm not comfortable making such a change without having the PDF.
There may be a different cause than what you think.
> Support "SymbolSetEncoding" for fonts
> -------------------------------------
>
> Key: PDFBOX-6004
> URL: https://issues.apache.org/jira/browse/PDFBOX-6004
> Project: PDFBox
> Issue Type: Improvement
> Components: PDModel
> Affects Versions: 2.0.33
> Reporter: Constantine Dokolas
> Priority: Minor
>
> I've encountered a PDF with a font named "SymbolMT" which defines its
> encoding as {{{}SymbolSetEncoding{}}}. Using the debugger app, I get a
> warning ({{{}Warning [PDSimpleFont] Unknown encoding: SymbolSetEncoding{}}})
> and multiple {{No Unicode mapping ...}} warnings.
> I couldn't find official documentation for this encoding, but the {{pdf.js}}
> project has support for this encoding implemented [here
> |https://github.com/mozilla/pdf.js/blob/6f052312d625224173db36d3e661657a89cf1865/src/core/encodings.js#L207]
> and it looks correct at first glance.
> Perhaps it's possible to support this encoding?
> Notes
> * I've not tested text extraction with PDFBox to see what codepoints are
> generated, but Adobe Acrobat converts those codes to the box char (the
> "unknown" char?)
> * The pdfdebugger app font viewer says: "Encoding: BuiltInEncoding / built
> in (TTF)"
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