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diff --git a/fxjs/cjs_globaldata.h b/fxjs/cjs_globaldata.h
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+++ b/fxjs/cjs_globaldata.h
@@ -0,0 +1,77 @@
+// Copyright 2014 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 FXJS_CJS_GLOBALDATA_H_
+#define FXJS_CJS_GLOBALDATA_H_
+
+#include <memory>
+#include <vector>
+
+#include "core/fxcrt/cfx_binarybuf.h"
+#include "fxjs/cjs_keyvalue.h"
+
+class CPDFSDK_FormFillEnvironment;
+
+class CJS_GlobalData_Element {
+ public:
+  CJS_GlobalData_Element() {}
+  ~CJS_GlobalData_Element() {}
+
+  CJS_KeyValue data;
+  bool bPersistent;
+};
+
+class CJS_GlobalData {
+ public:
+  static CJS_GlobalData* GetRetainedInstance(CPDFSDK_FormFillEnvironment* pApp);
+  void Release();
+
+  void SetGlobalVariableNumber(const ByteString& propname, double dData);
+  void SetGlobalVariableBoolean(const ByteString& propname, bool bData);
+  void SetGlobalVariableString(const ByteString& propname,
+                               const ByteString& sData);
+  void SetGlobalVariableObject(const ByteString& propname,
+                               const CJS_GlobalVariableArray& array);
+  void SetGlobalVariableNull(const ByteString& propname);
+  bool SetGlobalVariablePersistent(const ByteString& propname,
+                                   bool bPersistent);
+  bool DeleteGlobalVariable(const ByteString& propname);
+
+  int32_t GetSize() const;
+  CJS_GlobalData_Element* GetAt(int index) const;
+
+ private:
+  using iterator =
+      std::vector<std::unique_ptr<CJS_GlobalData_Element>>::iterator;
+  using const_iterator =
+      std::vector<std::unique_ptr<CJS_GlobalData_Element>>::const_iterator;
+
+  CJS_GlobalData();
+  ~CJS_GlobalData();
+
+  void LoadGlobalPersistentVariables();
+  void SaveGlobalPersisitentVariables();
+
+  CJS_GlobalData_Element* GetGlobalVariable(const ByteString& sPropname);
+  iterator FindGlobalVariable(const ByteString& sPropname);
+  const_iterator FindGlobalVariable(const ByteString& sPropname) const;
+
+  void LoadFileBuffer(const wchar_t* sFilePath,
+                      uint8_t*& pBuffer,
+                      int32_t& nLength);
+  void WriteFileBuffer(const wchar_t* sFilePath,
+                       const char* pBuffer,
+                       int32_t nLength);
+  void MakeByteString(const ByteString& name,
+                      CJS_KeyValue* pData,
+                      CFX_BinaryBuf& sData);
+
+  size_t m_RefCount;
+  std::vector<std::unique_ptr<CJS_GlobalData_Element>> m_arrayGlobalData;
+  WideString m_sFilePath;
+};
+
+#endif  // FXJS_CJS_GLOBALDATA_H_