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diff --git a/core/fpdfdoc/cpdf_interactiveform.h b/core/fpdfdoc/cpdf_interactiveform.h
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+++ b/core/fpdfdoc/cpdf_interactiveform.h
@@ -0,0 +1,111 @@
+// 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 CORE_FPDFDOC_CPDF_INTERACTIVEFORM_H_
+#define CORE_FPDFDOC_CPDF_INTERACTIVEFORM_H_
+
+#include <map>
+#include <memory>
+#include <vector>
+
+#include "core/fpdfapi/parser/fpdf_parser_decode.h"
+#include "core/fpdfdoc/cpdf_defaultappearance.h"
+#include "core/fpdfdoc/cpdf_formfield.h"
+#include "core/fxcrt/fx_string.h"
+#include "core/fxcrt/fx_system.h"
+#include "core/fxcrt/unowned_ptr.h"
+
+class CFieldTree;
+class CFDF_Document;
+class CPDF_Document;
+class CPDF_Dictionary;
+class CPDF_Font;
+class CPDF_FormControl;
+class CPDF_Object;
+class CPDF_Page;
+class IPDF_FormNotify;
+
+CPDF_Font* AddNativeInterFormFont(CPDF_Dictionary*& pFormDict,
+                                  CPDF_Document* pDocument,
+                                  ByteString* csNameTag);
+
+class CPDF_InterForm {
+ public:
+  explicit CPDF_InterForm(CPDF_Document* pDocument);
+  ~CPDF_InterForm();
+
+  static void SetUpdateAP(bool bUpdateAP);
+  static bool IsUpdateAPEnabled();
+  static CPDF_Font* AddStandardFont(CPDF_Document* pDocument,
+                                    ByteString csFontName);
+  static ByteString GetNativeFont(uint8_t iCharSet, void* pLogFont);
+  static uint8_t GetNativeCharSet();
+  static CPDF_Font* AddNativeFont(uint8_t iCharSet, CPDF_Document* pDocument);
+  static CPDF_Font* AddNativeFont(CPDF_Document* pDocument);
+
+  size_t CountFields(const WideString& csFieldName) const;
+  CPDF_FormField* GetField(uint32_t index, const WideString& csFieldName) const;
+  CPDF_FormField* GetFieldByDict(CPDF_Dictionary* pFieldDict) const;
+
+  CPDF_FormControl* GetControlAtPoint(CPDF_Page* pPage,
+                                      const CFX_PointF& point,
+                                      int* z_order) const;
+  CPDF_FormControl* GetControlByDict(const CPDF_Dictionary* pWidgetDict) const;
+
+  bool NeedConstructAP() const;
+  int CountFieldsInCalculationOrder();
+  CPDF_FormField* GetFieldInCalculationOrder(int index);
+  int FindFieldInCalculationOrder(const CPDF_FormField* pField);
+
+  CPDF_Font* GetFormFont(ByteString csNameTag) const;
+  CPDF_DefaultAppearance GetDefaultAppearance() const;
+  int GetFormAlignment() const;
+
+  bool CheckRequiredFields(const std::vector<CPDF_FormField*>* fields,
+                           bool bIncludeOrExclude) const;
+
+  std::unique_ptr<CFDF_Document> ExportToFDF(const WideString& pdf_path,
+                                             bool bSimpleFileSpec) const;
+
+  std::unique_ptr<CFDF_Document> ExportToFDF(
+      const WideString& pdf_path,
+      const std::vector<CPDF_FormField*>& fields,
+      bool bIncludeOrExclude,
+      bool bSimpleFileSpec) const;
+
+  void ResetForm(NotificationOption notify);
+
+  // TODO(tsepez): Use a span.
+  void ResetForm(const std::vector<CPDF_FormField*>& fields,
+                 bool bIncludeOrExclude,
+                 NotificationOption notify);
+
+  void SetFormNotify(IPDF_FormNotify* pNotify);
+  bool HasXFAForm() const;
+  void FixPageFields(CPDF_Page* pPage);
+
+  IPDF_FormNotify* GetFormNotify() const { return m_pFormNotify.Get(); }
+  CPDF_Document* GetDocument() const { return m_pDocument.Get(); }
+  CPDF_Dictionary* GetFormDict() const { return m_pFormDict.Get(); }
+
+ private:
+  void LoadField(CPDF_Dictionary* pFieldDict, int nLevel);
+  void AddTerminalField(CPDF_Dictionary* pFieldDict);
+  CPDF_FormControl* AddControl(CPDF_FormField* pField,
+                               CPDF_Dictionary* pWidgetDict);
+
+  static bool s_bUpdateAP;
+
+  UnownedPtr<CPDF_Document> const m_pDocument;
+  UnownedPtr<CPDF_Dictionary> m_pFormDict;
+  std::map<const CPDF_Dictionary*, std::unique_ptr<CPDF_FormControl>>
+      m_ControlMap;
+  std::unique_ptr<CFieldTree> m_pFieldTree;
+  ByteString m_bsEncoding;
+  UnownedPtr<IPDF_FormNotify> m_pFormNotify;
+};
+
+#endif  // CORE_FPDFDOC_CPDF_INTERACTIVEFORM_H_