[jira] [Created] (PDFBOX-4033) KerningSubtable should skip zero-length kerning subtables

["Max Gilead (JIRA)" <ji...@apache.org>]

Max Gilead created PDFBOX-4033:
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             Summary: KerningSubtable should skip zero-length kerning subtables
                 Key: PDFBOX-4033
                 URL: https://issues.apache.org/jira/browse/PDFBOX-4033
             Project: PDFBox
          Issue Type: Bug
          Components: FontBox
    Affects Versions: 2.0.8
         Environment: Any
            Reporter: Max Gilead


DejaVuSansLight has a zero-length kerning subtable. This currently triggers an IOException but it seems to be safe to ignore such tables.

The simple fix below (the {color:red}BLOCK ADDED{color} block) makes PDFBox work with fonts like that.

We must use a locally-patched PDFBox fork as it is paramount to us that it works uninterrupted as much as possible, even with less-than-ideal data.

{{private void readSubtable0(TTFDataStream data) throws IOException
    {
        int version = data.readUnsignedShort();
        if (version != 0)
        {
            LOG.info("Unsupported kerning sub-table version: " + version);
            return;
        }
        int length = data.readUnsignedShort();
        if (length < 6)
        {
            {color:red}if (length == 0) // BLOCK ADDED
            {
                LOG.info("Kerning sub-table empty, skipping.");
                return;
            }{color}
            throw new IOException("Kerning sub-table too short, got " + length
                    + " bytes, expect 6 or more.");
        }
}}



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