
Attach (recommended) or Link to PDF file here:
[NAPEN16171380959.pdf](https://github.com/mozilla/pdf.js/files/6143802/NAPEN16171380959.pdf)

Configuration:
- Web browser and its version: Firefox 88 Nightly
- Operating system and its version: Windows 10
- PDF.js version:
- Is a browser extension: No

What went wrong? (add screenshot)
![](https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2021-03-15-10-58-27-ce2796.png)


);
        } else {
          glyf.data = newGlyfData.subarray(0, writeOffset);
        }
        return {
          missingGlyphs,
          maxSizeOfInstructions,
        };
      }
      function readPostScriptTable(post, propertiesObj, maxpNumGlyphs) {
        var start = (font.start ? font.start : 0) + post.offset;
        font.pos = start;
        var length = post.length,
          end = start + length;
        var version = font.getInt32();
        
        font.skip(28);
        var glyphNames;
        var valid = true;
        var i;
        switch (version) {
          case 0x00010000:
            glyphNames = MacStandardGlyphOrdering;
            break;
          case 0x00020000:
            var numGlyphs = font.getUint16();
            if (numGlyphs !== maxpNumGlyphs) {
              valid = false;
              break;
            }