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diff --git a/core/fpdfapi/font/cpdf_tounicodemap.h b/core/fpdfapi/font/cpdf_tounicodemap.h
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+++ b/core/fpdfapi/font/cpdf_tounicodemap.h
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+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FPDFAPI_FONT_CPDF_TOUNICODEMAP_H_
+#define CORE_FPDFAPI_FONT_CPDF_TOUNICODEMAP_H_
+
+#include <map>
+
+#include "core/fpdfapi/parser/cpdf_stream.h"
+#include "core/fxcrt/cfx_unowned_ptr.h"
+#include "core/fxcrt/fx_basic.h"
+
+class CPDF_CID2UnicodeMap;
+
+class CPDF_ToUnicodeMap {
+ public:
+  CPDF_ToUnicodeMap();
+  ~CPDF_ToUnicodeMap();
+
+  void Load(CPDF_Stream* pStream);
+
+  CFX_WideString Lookup(uint32_t charcode) const;
+  uint32_t ReverseLookup(wchar_t unicode) const;
+
+ private:
+  friend class cpdf_tounicodemap_StringToCode_Test;
+  friend class cpdf_tounicodemap_StringToWideString_Test;
+
+  static uint32_t StringToCode(const CFX_ByteStringC& str);
+  static CFX_WideString StringToWideString(const CFX_ByteStringC& str);
+
+  uint32_t GetUnicode();
+
+  std::map<uint32_t, uint32_t> m_Map;
+  CFX_UnownedPtr<CPDF_CID2UnicodeMap> m_pBaseMap;
+  CFX_WideTextBuf m_MultiCharBuf;
+};
+
+#endif  // CORE_FPDFAPI_FONT_CPDF_TOUNICODEMAP_H_