
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)


return this.cff.charStrings.count;
    },
    getCharset: function CFFFont_getCharset() {
      return this.cff.charset.charset;
    },
    getGlyphMapping: function CFFFont_getGlyphMapping() {
      var cff = this.cff;
      var properties = this.properties;
      var charsets = cff.charset.charset;
      var charCodeToGlyphId;
      var glyphId;
      if (properties.composite) {
        charCodeToGlyphId = Object.create(null);
        let charCode;
        if (cff.isCIDFont) {
          
          
          for (glyphId = 0; glyphId < charsets.length; glyphId++) {
            var cid = charsets[glyphId];
            charCode = properties.cMap.charCodeOf(cid);
            charCodeToGlyphId[charCode] = glyphId;
          }