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diff --git a/fpdfsdk/fsdk_define.h b/fpdfsdk/fsdk_define.h
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+++ b/fpdfsdk/fsdk_define.h
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+// 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 FPDFSDK_FSDK_DEFINE_H_
+#define FPDFSDK_FSDK_DEFINE_H_
+
+#include "core/fpdfapi/fpdf_parser/cpdf_parser.h"
+#include "core/fxge/fx_dib.h"
+#include "public/fpdfview.h"
+
+#ifdef PDF_ENABLE_XFA
+#include "fpdfsdk/fpdfxfa/fpdfxfa_doc.h"
+#endif  // PDF_ENABLE_XFA
+
+#ifdef _WIN32
+#include <math.h>
+#include <tchar.h>
+#endif
+
+class CPDF_Annot;
+class CPDF_Page;
+class CPDF_PageRenderContext;
+class IFSDK_PAUSE_Adapter;
+
+class CPDF_CustomAccess final : public IFX_FileRead {
+ public:
+  explicit CPDF_CustomAccess(FPDF_FILEACCESS* pFileAccess);
+  ~CPDF_CustomAccess() override {}
+
+  // IFX_FileRead
+  FX_FILESIZE GetSize() override;
+  void Release() override;
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
+
+#ifdef PDF_ENABLE_XFA
+  virtual CFX_ByteString GetFullPath();
+  virtual FX_BOOL GetByte(uint32_t pos, uint8_t& ch);
+  virtual FX_BOOL GetBlock(uint32_t pos, uint8_t* pBuf, uint32_t size);
+#endif  // PDF_ENABLE_XFA
+
+ private:
+  FPDF_FILEACCESS m_FileAccess;
+#ifdef PDF_ENABLE_XFA
+  uint8_t m_Buffer[512];
+  uint32_t m_BufferOffset;
+#endif  // PDF_ENABLE_XFA
+};
+
+#ifdef PDF_ENABLE_XFA
+class CFPDF_FileStream : public IFX_FileStream {
+ public:
+  explicit CFPDF_FileStream(FPDF_FILEHANDLER* pFS);
+  ~CFPDF_FileStream() override {}
+
+  // IFX_FileStream:
+  IFX_FileStream* Retain() override;
+  void Release() override;
+  FX_FILESIZE GetSize() override;
+  FX_BOOL IsEOF() override;
+  FX_FILESIZE GetPosition() override;
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
+  size_t ReadBlock(void* buffer, size_t size) override;
+  FX_BOOL WriteBlock(const void* buffer,
+                     FX_FILESIZE offset,
+                     size_t size) override;
+  FX_BOOL Flush() override;
+
+  void SetPosition(FX_FILESIZE pos) { m_nCurPos = pos; }
+
+ protected:
+  FPDF_FILEHANDLER* m_pFS;
+  FX_FILESIZE m_nCurPos;
+};
+#endif  // PDF_ENABLE_XFA
+
+// Object types for public FPDF_ types; these correspond to next layer down
+// from fpdfsdk. For master, these are CPDF_ types, but for XFA, these are
+// CPDFXFA_ types.
+#ifndef PDF_ENABLE_XFA
+using UnderlyingDocumentType = CPDF_Document;
+using UnderlyingPageType = CPDF_Page;
+#else   // PDF_ENABLE_XFA
+using UnderlyingDocumentType = CPDFXFA_Document;
+using UnderlyingPageType = CPDFXFA_Page;
+#endif  // PDF_ENABLE_XFA
+
+// Conversions to/from underlying types.
+UnderlyingDocumentType* UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc);
+FPDF_DOCUMENT FPDFDocumentFromUnderlying(UnderlyingDocumentType* doc);
+
+UnderlyingPageType* UnderlyingFromFPDFPage(FPDF_PAGE page);
+
+// Conversions to/from FPDF_ types.
+CPDF_Document* CPDFDocumentFromFPDFDocument(FPDF_DOCUMENT doc);
+FPDF_DOCUMENT FPDFDocumentFromCPDFDocument(CPDF_Document* doc);
+
+CPDF_Page* CPDFPageFromFPDFPage(FPDF_PAGE page);
+
+CFX_DIBitmap* CFXBitmapFromFPDFBitmap(FPDF_BITMAP bitmap);
+
+void FSDK_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable);
+FPDF_BOOL FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy);
+void FPDF_RenderPage_Retail(CPDF_PageRenderContext* pContext,
+                            FPDF_PAGE page,
+                            int start_x,
+                            int start_y,
+                            int size_x,
+                            int size_y,
+                            int rotate,
+                            int flags,
+                            FX_BOOL bNeedToRestore,
+                            IFSDK_PAUSE_Adapter* pause);
+
+void CheckUnSupportError(CPDF_Document* pDoc, uint32_t err_code);
+void CheckUnSupportAnnot(CPDF_Document* pDoc, const CPDF_Annot* pPDFAnnot);
+void ProcessParseError(CPDF_Parser::Error err);
+
+#endif  // FPDFSDK_FSDK_DEFINE_H_