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diff --git a/xfa/fxfa/parser/cxfa_calculate.h b/xfa/fxfa/parser/cxfa_calculate.h
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+++ b/xfa/fxfa/parser/cxfa_calculate.h
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+// Copyright 2016 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 XFA_FXFA_PARSER_CXFA_CALCULATE_H_
+#define XFA_FXFA_PARSER_CXFA_CALCULATE_H_
+
+#include "core/fxcrt/include/fx_string.h"
+#include "xfa/fxfa/parser/cxfa_data.h"
+#include "xfa/fxfa/parser/cxfa_script.h"
+
+class CXFA_Node;
+
+class CXFA_Calculate : public CXFA_Data {
+ public:
+  explicit CXFA_Calculate(CXFA_Node* pNode);
+
+  int32_t GetOverride();
+  CXFA_Script GetScript();
+  void GetMessageText(CFX_WideString& wsMessage);
+};
+
+#endif  // XFA_FXFA_PARSER_CXFA_CALCULATE_H_