
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)


}
    }
  }
  
  var differences = properties.differences,
    glyphsUnicodeMap;
  if (differences) {
    for (charCode in differences) {
      var glyphName = differences[charCode];
      glyphId = glyphNames.indexOf(glyphName);
      if (glyphId === -1) {
        if (!glyphsUnicodeMap) {
          glyphsUnicodeMap = getGlyphsUnicode();
        }
        var standardGlyphName = recoverGlyphName(glyphName, glyphsUnicodeMap);
        if (standardGlyphName !== glyphName) {
          glyphId = glyphNames.indexOf(standardGlyphName);
        }
      }
      if (glyphId >= 0) {
        charCodeToGlyphId[charCode] = glyphId;
      } else {
        charCodeToGlyphId[charCode] = 0; 
      }
    }
  }
  return charCodeToGlyphId;
}
var Type1Font = (function Type1FontClosure() {
  function findBlock(streamBytes, signature, startIndex) {