Use /ToUnicode when extracting simple TrueType fonts without explicit encoding

DEVSIX-1681

Author: Snipx

kernel/src/main/java/com/itextpdf/kernel/font/DocTrueTypeFont.java

@@ -75,7 +75,7 @@ private DocTrueTypeFont(PdfDictionary fontDictionary) {
         subtype = fontDictionary.getAsName(PdfName.Subtype);
     }
 
-    static TrueTypeFont createFontProgram(PdfDictionary fontDictionary, FontEncoding fontEncoding) {
+    static TrueTypeFont createFontProgram(PdfDictionary fontDictionary, FontEncoding fontEncoding, CMapToUnicode toUnicode) {
         DocTrueTypeFont fontProgram = new DocTrueTypeFont(fontDictionary);
         fillFontDescriptor(fontProgram, fontDictionary.getAsDictionary(PdfName.FontDescriptor));
 
@@ -91,6 +91,8 @@ static TrueTypeFont createFontProgram(PdfDictionary fontDictionary, FontEncoding
             //FontEncoding.codeToUnicode table has higher priority
             if (glyph.hasValidUnicode() && fontEncoding.convertToByte(glyph.getUnicode()) == i) {
                 fontProgram.unicodeToGlyph.put(glyph.getUnicode(), glyph);
+            } else if (toUnicode != null) {
+                glyph.setChars(toUnicode.lookup(i));
             }
             if (widths[i] > 0) {
                 glyphsWithWidths++;

kernel/src/main/java/com/itextpdf/kernel/font/PdfTrueTypeFont.java

@@ -90,7 +90,7 @@ public class PdfTrueTypeFont extends PdfSimpleFont<TrueTypeFont> {
         newFont = false;
         CMapToUnicode toUni = FontUtil.processToUnicode(fontDictionary.get(PdfName.ToUnicode));
         fontEncoding = DocFontEncoding.createDocFontEncoding(fontDictionary.get(PdfName.Encoding), toUni);
-        fontProgram = DocTrueTypeFont.createFontProgram(fontDictionary, fontEncoding);
+        fontProgram = DocTrueTypeFont.createFontProgram(fontDictionary, fontEncoding, toUni);
         embedded = ((IDocFontProgram) fontProgram).getFontFile() != null;
         subset = false;
     }