code: public int codePointConversion(String fontName, int codePoint) {
  
          NonStandardFontFamily nonStandardFontFamily = get(fontName);
          if (nonStandardFontFamily == null)
              return codePoint;
  
          CodePointSet codePointSet = nonStandardFontFamily.getCodePointSet();
          if (codePointSet == null)
              return codePoint;
  
          CodePoint decimalCodePoint = codePointSet.getByDecimal(codePoint);
          if (decimalCodePoint != null)
              // Fetches the correct unicode point
              return decimalCodePoint.getUnicodeDecimal();
  
          CodePoint nameCodePoint = codePointSet.getByName(charNameByCodePoint
                  .get(codePoint));
          if (nameCodePoint != null)
              return nameCodePoint.getUnicodeDecimal();
  
          return codePoint;
      }
docs: Takes in argument a codepoint. If for the given police the codepoint
  doesn't correspond to what the font actually displays, the conversion is
  made. Otherwise, the old codepoint is return.
  
  @param fontName
  name of the font of the character in the pdf
  @param oldCodePoint
  unicode point in the original pdf
  @return