added correct kernings to letters in MCD file (default fonts only, no…

…t for custom fonts)

lib/fileTypeUtils/ktb/ktbIO.dart

@@ -0,0 +1,48 @@
+
+import '../utils/ByteDataWrapper.dart';
+
+class KtbEntry {
+  final String left;
+  final String right;
+  final int kerning;
+
+  const KtbEntry(this.left, this.right, this.kerning);
+
+  KtbEntry.read(ByteDataWrapper bytes)
+    : left = bytes.readString(2, encoding: StringEncoding.utf16),
+      right = bytes.readString(2, encoding: StringEncoding.utf16),
+      kerning = bytes.readInt16();
+
+  void write(ByteDataWrapper bytes) {
+    bytes.writeString(left, StringEncoding.utf16);
+    bytes.writeString(right, StringEncoding.utf16);
+    bytes.writeInt32(kerning);
+  }
+}
+
+class KtbFile {
+  final List<KtbEntry> entries;
+
+  const KtbFile(this.entries);
+
+  KtbFile.read(ByteDataWrapper bytes) : entries = <KtbEntry>[] {
+    var count = bytes.readInt16();
+    for (var i = 0; i < count; i++) {
+      entries.add(KtbEntry.read(bytes));
+    }
+  }
+
+  static Future<KtbFile> fromFile(String path) async {
+    var bytes = await ByteDataWrapper.fromFile(path);
+    return KtbFile.read(bytes);
+  }
+
+  void write(ByteDataWrapper bytes) {
+    bytes.writeInt16(entries.length);
+    for (var entry in entries) {
+      entry.write(bytes);
+    }
+  }
+}
+
+