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https://issues.apache.org/jira/browse/PDFBOX-3395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15374390#comment-15374390
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Daniel Persson commented on PDFBOX-3395:
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Then again the specification doesn't say that a glyph table require any glyphs.
So why should an empty generate a warning. A missing table, yes that is an
error....
> Throwing exception when PDF has unused empty fonts embedded.
> ------------------------------------------------------------
>
> Key: PDFBOX-3395
> URL: https://issues.apache.org/jira/browse/PDFBOX-3395
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Reporter: Daniel Persson
>
> I was trying to follow up on the issues in our system and found that some PDF
> files threw ERRORs. These PDFs are produced by a publishing system and that
> system seems to add fonts when you change to them and add them even though
> they are never used. Or only space is used. Then they add this font with an
> empty glyf table. This results in that errors are thrown on files that are
> fine.
> Line 310 in TTFParser removes empty glyf tables.
> // skip tables with zero length
> if (table.getLength() == 0)
> {
> return null;
> }
> return table;
> Line 215 of TTFParser throws exception when glyf table is missing.
> if (font.getGlyph() == null)
> {
> throw new IOException("glyf is mandatory");
> }
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