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https://issues.apache.org/jira/browse/PDFBOX-3748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Tilman Hausherr resolved PDFBOX-3748.
-------------------------------------
Resolution: Fixed
Assignee: Tilman Hausherr
Surprisingly, the description in
https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6kern.html
and
http://www.microsoft.com/typography/tt/ttf_spec/ttch02.doc
are different, incompatible and conflicting (tupleIndex and position of
subtable format). Our existing implementation follows the microsoft document.
I'm setting this to resolved without doing a further implementation and here's
why:
- According to https://www.microsoft.com/typography/OTSPEC/recom.htm Windows
doesn't support format 2. So it wouldn't make sense for a font vendor to use
that one
- I have a doubt whether this font is correct. I read the first 4 words of that
subtable. According to it, leftOffsetTable starts at 1 which would be within
the header?!
- We haven't had a request for this. The kern table would be needed only for
PDF creation, not for text extraction or rendering.
> java.lang.UnsupportedOperationException: Kerning table version 0 format 2 not
> yet supported.
> --------------------------------------------------------------------------------------------
>
> Key: PDFBOX-3748
> URL: https://issues.apache.org/jira/browse/PDFBOX-3748
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Affects Versions: 2.0.4, 2.0.5
> Reporter: Thomas Penne
> Assignee: Tilman Hausherr
> Attachments: file.pdf
>
>
> Hi everyone, I am currently using pdfbox to extract text from pdf files and I
> an encountering an UnsupportedOperationException while trying to extract text
> from provided file (file.pdf)
> {quote}
> ...
> Caused by: java.lang.UnsupportedOperationException: Kerning table version
> 0 format 2 not yet supported.
> at
> org.apache.fontbox.ttf.KerningSubtable.readSubtable0Format2(KerningSubtable.java:231)
> at
> org.apache.fontbox.ttf.KerningSubtable.readSubtable0(KerningSubtable.java:215)
> at org.apache.fontbox.ttf.KerningSubtable.read(KerningSubtable.java:70)
> at org.apache.fontbox.ttf.KerningTable.read(KerningTable.java:80)
> at org.apache.fontbox.ttf.TrueTypeFont.readTable(TrueTypeFont.java:324)
> at org.apache.fontbox.ttf.TTFParser.parseTables(TTFParser.java:174)
> at org.apache.fontbox.ttf.TTFParser.parse(TTFParser.java:150)
> at org.apache.fontbox.ttf.TTFParser.parse(TTFParser.java:106)
> at
> org.apache.pdfbox.pdmodel.font.PDTrueTypeFont.<init>(PDTrueTypeFont.java:178)
> at
> org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:75)
> at org.apache.pdfbox.pdmodel.PDResources.getFont(PDResources.java:143)
> at
> org.apache.pdfbox.contentstream.operator.text.SetFontAndSize.process(SetFontAndSize.java:60)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:829)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:486)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:460)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:150)
> at
> org.apache.pdfbox.text.LegacyPDFStreamEngine.processPage(LegacyPDFStreamEngine.java:139)
> at
> org.apache.pdfbox.text.PDFTextStripper.processPage(PDFTextStripper.java:391)
> at
> org.apache.pdfbox.text.PDFTextStripper.processPages(PDFTextStripper.java:319)
> at
> org.apache.pdfbox.text.PDFTextStripper.writeText(PDFTextStripper.java:266)
> at
> org.apache.pdfbox.text.PDFTextStripper.getText(PDFTextStripper.java:227)
> ...
> {quote}
> I would like to understand what in my file causes this error and if anyone
> knows a workaround to perform text extraction successfully on this file.
> Thank you in advance guys
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