[FOP-2993] With PDFBox 2.0.22: Failed to embed font / Illegal offSize value 0 in CFF font

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 2.5
• Component/s: font/opentype
• Environment: Arch Linux
• Assignee: Unassigned
• Reporter: Justus Piater
• Created: 07/Jan/21 13:12
• Updated: 08/Jan/21 10:11
• Resolved: 08/Jan/21 10:11

Description

This bug did not show with PDFBox 2.0.21 and appeared with PDFBox 2.0.22 so it may actually be a bug in PDFBox (or with this font). However, it may be related to PDFBOX-5033. Moreover, I have no use for PDFBox besides FOP and don't know how to test the fontbox jar without FOP.

To trigger this bug, run fop on this this .fo: 

<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="one">
      <fo:region-body />
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="one">
    <fo:flow flow-name="xsl-region-body">
      <fo:block font-family="FreeMono">Text</fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>

 This causes the following exception; the full exception backtrace is attached:

Jan 07, 2021 11:44:37 AM org.apache.fop.apps.FOUserAgent processEvent
INFO: Rendered page #1.
Jan 07, 2021 11:44:37 AM org.apache.fop.pdf.PDFFactory makeFontFile
SEVERE: Failed to embed font [org.apache.fop.fonts.LazyFont@5d25e6bb{FreeMono}{metrics-url=null,embed-url=/usr/share/fonts/gnu-free/FreeMono.otf,kerning=true,advanced=true}] FreeMono
java.io.IOException: Illegal (< 1 or > 4) offSize value 0 in CFF font at position 42277
at org.apache.fontbox.cff.CFFDataInput.readOffSize(CFFDataInput.java:85)

This bug triggers with all GNU Free fonts, but not with any of the other OTF fonts I tried.

I also attach my fop.xconf (with explicit <font> specifications because of FOP-2591).