core/ difference with XFA (for information only).

core/src/fxcrt/extension.h

Index: core/src/fxcrt/extension.h
diff --git a/core/src/fxcrt/extension.h b/core/src/fxcrt/extension.h
index a23eab5c58274effa2a9044691bcc3483e53a232..42cebdf60575d8d9856e99f88ebb782d6771e1b3 100644
--- a/core/src/fxcrt/extension.h
+++ b/core/src/fxcrt/extension.h
@@ -31,6 +31,40 @@ class IFXCRT_FileAccess {
 };
 IFXCRT_FileAccess* FXCRT_FileAccess_Create();
 
+#ifdef PDF_ENABLE_XFA
+class CFX_CRTFileAccess : public IFX_FileAccess {
+ public:
+  CFX_CRTFileAccess() : m_RefCount(0) {}
+
+  // IFX_FileAccess
+  void Release() override {
+    if (--m_RefCount == 0)
+      delete this;
+  }
+
+  IFX_FileAccess* Retain() override {
+    m_RefCount++;
+    return (IFX_FileAccess*)this;
+  }
+
+  void GetPath(CFX_WideString& wsPath) override { wsPath = m_path; }
+
+  IFX_FileStream* CreateFileStream(FX_DWORD dwModes) override {
+    return FX_CreateFileStream(m_path, dwModes);
+  }
+
+  FX_BOOL Init(const CFX_WideStringC& wsPath) {
+    m_path = wsPath;
+    m_RefCount = 1;
+    return TRUE;
+  }
+
+ protected:
+  CFX_WideString m_path;
+  FX_DWORD m_RefCount;
+};
+
+#endif
 class CFX_CRTFileStream final : public IFX_FileStream {
  public:
   CFX_CRTFileStream(IFXCRT_FileAccess* pFA) : m_pFile(pFA), m_dwCount(1) {}