fpdfsdk/ differences with XFA (for didactic purposes only).

fpdfsdk/include/fsdk_define.h

Index: fpdfsdk/include/fsdk_define.h
diff --git a/fpdfsdk/include/fsdk_define.h b/fpdfsdk/include/fsdk_define.h
index 980411c27b5e8f48d87e9d83f5e10e1a45e54430..4dfe5c284008806cb800a9dab2c21a1f505a2bbc 100644
--- a/fpdfsdk/include/fsdk_define.h
+++ b/fpdfsdk/include/fsdk_define.h
@@ -7,16 +7,31 @@
 #ifndef FPDFSDK_INCLUDE_FSDK_DEFINE_H_
 #define FPDFSDK_INCLUDE_FSDK_DEFINE_H_
 
+#ifndef PDF_ENABLE_XFA
 #include "core/include/fpdfapi/fpdfapi.h"
+#else
+#include "../../xfa/include/fwl/adapter/fwl_adaptertimermgr.h"
+#include "../../xfa/include/fxbarcode/BC_BarCode.h"
+#include "../../xfa/include/fxfa/fxfa.h"
+#include "../../xfa/include/fxgraphics/fx_graphics.h"
+#include "../../xfa/include/fxjse/fxjse.h"
+#endif
 #include "core/include/fpdfapi/fpdf_module.h"
 #include "core/include/fpdfapi/fpdf_pageobj.h"
 #include "core/include/fpdfapi/fpdf_parser.h"
 #include "core/include/fpdfapi/fpdf_render.h"
 #include "core/include/fpdfapi/fpdf_serial.h"
+#ifdef PDF_ENABLE_XFA
+#include "core/include/fpdfapi/fpdfapi.h"
+#endif
 #include "core/include/fpdfdoc/fpdf_doc.h"
 #include "core/include/fpdfdoc/fpdf_vt.h"
 #include "core/include/fxge/fx_ge.h"
 #include "core/include/fxge/fx_ge_win32.h"
+#ifdef PDF_ENABLE_XFA
+#include "fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h"
+#include "fpdfsdk/include/fpdfxfa/fpdfxfa_page.h"
+#endif
 #include "public/fpdfview.h"
 
 #ifdef _WIN32
@@ -48,15 +63,54 @@ class CPDF_CustomAccess final : public IFX_FileRead {
   void Release() override { delete this; }
   FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
 
+#ifdef PDF_ENABLE_XFA
+  virtual CFX_ByteString GetFullPath() { return ""; }
+  virtual FX_BOOL GetByte(FX_DWORD pos, uint8_t& ch);
+  virtual FX_BOOL GetBlock(FX_DWORD pos, uint8_t* pBuf, FX_DWORD size);
+
+#endif
  private:
   FPDF_FILEACCESS m_FileAccess;
+#ifdef PDF_ENABLE_XFA
+  uint8_t m_Buffer[512];
+  FX_DWORD m_BufferOffset;
+};
+
+class CFPDF_FileStream : public IFX_FileStream {
+ public:
+  CFPDF_FileStream(FPDF_FILEHANDLER* pFS);
+  virtual ~CFPDF_FileStream() {}
+
+  virtual IFX_FileStream* Retain();
+  virtual void Release();
+
+  virtual FX_FILESIZE GetSize();
+  virtual FX_BOOL IsEOF();
+  virtual FX_FILESIZE GetPosition() { return m_nCurPos; }
+  virtual void SetPosition(FX_FILESIZE pos) { m_nCurPos = pos; }
+  virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size);
+  virtual size_t ReadBlock(void* buffer, size_t size);
+  virtual FX_BOOL WriteBlock(const void* buffer,
+                             FX_FILESIZE offset,
+                             size_t size);
+  virtual FX_BOOL Flush();
+
+ protected:
+  FPDF_FILEHANDLER* m_pFS;
+  FX_FILESIZE m_nCurPos;
+#endif
 };
 
 // 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
+using UnderlyingDocumentType = CPDFXFA_Document;
+using UnderlyingPageType = CPDFXFA_Page;
+#endif
 
 // Conversions to/from underlying types.
 UnderlyingDocumentType* UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc);