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+/*
+ * Copyright 2011 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SFNTLY_CPP_SRC_SFNTLY_TABLE_SUBTABLE_H_
+#define SFNTLY_CPP_SRC_SFNTLY_TABLE_SUBTABLE_H_
+
+#include "sfntly/table/font_data_table.h"
+
+namespace sfntly {
+
+// An abstract base class for subtables. Subtables are smaller tables nested
+// within other tables and don't have an entry in the main font index. Examples
+// of these are the CMap subtables within CMap table (cmap) or a glyph within
+// the glyph table (glyf).
+class SubTable : public FontDataTable {
+ public:
+  class Builder : public FontDataTable::Builder {
+   public:
+    virtual ~Builder();
+
+   protected:
+    Builder(FontDataTableBuilderContainer* container, WritableFontData* data);
+    Builder(FontDataTableBuilderContainer* container, ReadableFontData* data);
+  };
+
+  virtual ~SubTable();
+
+ protected:
+  // Note: constructor refactored in C++ to avoid heavy lifting.
+  //       caller need to do data->Slice(offset, length) beforehand.
+  explicit SubTable(ReadableFontData* data);
+};
+
+}  // namespace sfntly
+
+#endif  // SFNTLY_CPP_SRC_SFNTLY_TABLE_SUBTABLE_H_