Support 64k glyphs per TTF font

 # 1.3.7
 * Add Pdf Creation date
+* Support 64k glyphs per TTF font
 
 # 1.3.6
 * Fix TTF Font SubSetting

@@ -27,6 +27,9 @@ class PdfTtfFont extends PdfFont {
     widthsObject = PdfArrayObject(pdfDocument, <String>[]);
   }
 
+  @override
+  String get subtype => font.unicode ? '/Type0' : super.subtype;
+
   PdfUnicodeCmap unicodeCMap;
 
   PdfFontDescriptor descriptor;
@@ -57,26 +60,60 @@ class PdfTtfFont extends PdfFont {
     return font.glyphInfoMap[g] ?? PdfFontMetrics.zero;
   }
 
-  @override
-  void _prepare() {
+  void _buildTrueType(Map<String, PdfStream> params) {
     int charMin;
     int charMax;
 
-    super._prepare();
+    file.buf.putBytes(font.bytes.buffer.asUint8List());
+    file.params['/Length1'] = PdfStream.intNum(font.bytes.lengthInBytes);
+
+    params['/BaseFont'] = PdfStream.string('/' + fontName);
+    params['/FontDescriptor'] = descriptor.ref();
+    charMin = 32;
+    charMax = 255;
+    for (int i = charMin; i <= charMax; i++) {
+      widthsObject.values
+          .add((glyphMetrics(i).advanceWidth * 1000.0).toInt().toString());
+    }
+    params['/FirstChar'] = PdfStream.intNum(charMin);
+    params['/LastChar'] = PdfStream.intNum(charMax);
+    params['/Widths'] = widthsObject.ref();
+  }
+
+  void _buildType0(Map<String, PdfStream> params) {
+    int charMin;
+    int charMax;
 
     final TtfWriter ttfWriter = TtfWriter(font);
     final Uint8List data = ttfWriter.withChars(unicodeCMap.cmap);
-
     file.buf.putBytes(data);
     file.params['/Length1'] = PdfStream.intNum(data.length);
 
+    final PdfStream descendantFont = PdfStream.dictionary(<String, PdfStream>{
+      '/Type': PdfStream.string('/Font'),
+      '/BaseFont': PdfStream.string('/' + fontName),
+      '/FontFile2': file.ref(),
+      '/FontDescriptor': descriptor.ref(),
+      '/W': PdfStream.array(<PdfStream>[
+        PdfStream.intNum(0),
+        widthsObject.ref(),
+      ]),
+      '/CIDToGIDMap': PdfStream.string('/Identity'),
+      '/DW': PdfStream.string('1000'),
+      '/Subtype': PdfStream.string('/CIDFontType2'),
+      '/CIDSystemInfo': PdfStream.dictionary(<String, PdfStream>{
+        '/Supplement': PdfStream.intNum(0),
+        '/Registry': PdfStream()..putText('Adobe'),
+        '/Ordering': PdfStream()..putText('Identity-H'),
+      })
+    });
+
     params['/BaseFont'] = PdfStream.string('/' + fontName);
-    params['/FontDescriptor'] = descriptor.ref();
-    if (font.unicode) {
-      if (params.containsKey('/Encoding')) {
-        params.remove('/Encoding');
-      }
+    params['/Encoding'] = PdfStream.string('/Identity-H');
+    params['/DescendantFonts'] = PdfStream()
+      ..putArray(<PdfStream>[descendantFont]);
     params['/ToUnicode'] = unicodeCMap.ref();
+
     charMin = 0;
     charMax = unicodeCMap.cmap.length - 1;
     for (int i = charMin; i <= charMax; i++) {
@@ -85,17 +122,17 @@ class PdfTtfFont extends PdfFont {
               .toInt()
               .toString());
     }
-    } else {
-      charMin = 32;
-      charMax = 255;
-      for (int i = charMin; i <= charMax; i++) {
-        widthsObject.values
-            .add((glyphMetrics(i).advanceWidth * 1000.0).toInt().toString());
   }
+
+  @override
+  void _prepare() {
+    super._prepare();
+
+    if (font.unicode) {
+      _buildType0(params);
+    } else {
+      _buildTrueType(params);
     }
-    params['/FirstChar'] = PdfStream.intNum(charMin);
-    params['/LastChar'] = PdfStream.intNum(charMax);
-    params['/Widths'] = widthsObject.ref();
   }
 
   @override
@@ -105,7 +142,8 @@ class PdfTtfFont extends PdfFont {
     }
 
     final Runes runes = text.runes;
-    final List<int> bytes = List<int>();
+    final PdfStream stream = PdfStream();
+    stream.putBytes(latin1.encode('<'));
     for (int rune in runes) {
       int char = unicodeCMap.cmap.indexOf(rune);
       if (char == -1) {
@@ -113,13 +151,10 @@ class PdfTtfFont extends PdfFont {
         unicodeCMap.cmap.add(rune);
       }
 
-      bytes.add(char);
+      stream.putBytes(latin1.encode(char.toRadixString(16).padLeft(4, '0')));
     }
-
-    return PdfStream()
-      ..putBytes(latin1.encode('('))
-      ..putTextBytes(bytes)
-      ..putBytes(latin1.encode(')'));
+    stream.putBytes(latin1.encode('>'));
+    return stream;
   }
 
   @override

@@ -34,14 +34,14 @@ class PdfUnicodeCmap extends PdfObjectStream {
         '/CMapName/Adobe-Identity-UCS def\n'
         '/CMapType 2 def\n'
         '1 begincodespacerange\n'
-        '<00> <FF>\n'
+        '<0000> <FFFF>\n'
         'endcodespacerange\n'
         '${cmap.length} beginbfchar\n');
 
     for (int key = 0; key < cmap.length; key++) {
       final int value = cmap[key];
       buf.putString('<' +
-          key.toRadixString(16).toUpperCase().padLeft(2, '0') +
+          key.toRadixString(16).toUpperCase().padLeft(4, '0') +
           '> <' +
           value.toRadixString(16).toUpperCase().padLeft(4, '0') +
           '>\n');