Index: src/libchcore/IFilesystemFile.h
===================================================================
diff -u -r27c262eb9cae55720e10f4886af6b5a82cb94fe9 -r479ad4e8f81a68cbf6d1623cd9b1f3342d8cfdcc
--- src/libchcore/IFilesystemFile.h	(.../IFilesystemFile.h)	(revision 27c262eb9cae55720e10f4886af6b5a82cb94fe9)
+++ src/libchcore/IFilesystemFile.h	(.../IFilesystemFile.h)	(revision 479ad4e8f81a68cbf6d1623cd9b1f3342d8cfdcc)
@@ -22,6 +22,7 @@
 #include "libchcore.h"
 #include "TPath.h"
 #include "TOverlappedDataBuffer.h"
+#include "CommonDataTypes.h"
 
 namespace chcore
 {
@@ -33,12 +34,14 @@
 	public:
 		virtual ~IFilesystemFile();
 
-		virtual bool OpenExistingForReading(bool bNoBuffering) = 0;
-		virtual bool CreateNewForWriting(bool bNoBuffering) = 0;
-		virtual bool OpenExistingForWriting(bool bNoBuffering) = 0;
+		virtual bool OpenExistingForReading() = 0;
+		virtual bool CreateNewForWriting() = 0;
+		virtual bool OpenExistingForWriting() = 0;
 
-		virtual bool Truncate(long long ullNewSize) = 0;
+		virtual file_size_t GetSeekPositionForResume(file_size_t fsLastAvailablePosition) = 0;
 
+		virtual bool Truncate(file_size_t fsNewSize) = 0;
+
 		virtual bool ReadFile(TOverlappedDataBuffer& rBuffer) = 0;
 		virtual bool WriteFile(TOverlappedDataBuffer& rBuffer) = 0;
 		virtual bool FinalizeFile(TOverlappedDataBuffer& rBuffer) = 0;