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diff --git a/tools/preproc/charmap.h b/tools/preproc/charmap.h
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+// Copyright(c) 2016 YamaArashi
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#ifndef CHARMAP_H
+#define CHARMAP_H
+
+#include <cstdint>
+#include <string>
+#include <map>
+#include <vector>
+
+class Charmap
+{
+public:
+    Charmap(std::string filename);
+
+    std::string Char(std::int32_t code)
+    {
+        auto it = m_chars.find(code);
+
+        if (it == m_chars.end())
+            return std::string();
+
+        return it->second;
+    }
+
+    std::string Escape(unsigned char code)
+    {
+        return m_escapes[code];
+    }
+
+    std::string Constant(std::string identifier)
+    {
+        auto it = m_constants.find(identifier);
+
+        if (it == m_constants.end())
+            return std::string();
+
+        return it->second;
+    }
+private:
+    std::map<std::int32_t, std::string> m_chars;
+    std::string m_escapes[128];
+    std::map<std::string, std::string> m_constants;
+};
+
+#endif // CHARMAP_H