3 files changed, 33 insertions, 0 deletions
diff --git a/src/Format/FormatCom.cpp b/src/Format/FormatCom.cpp
index 18653761..d696f00f 100644
--- a/src/Format/FormatCom.cpp
+++ b/src/Format/FormatCom.cpp
@@ -187,6 +187,11 @@ public:
 		return BaseCom::NotifyService (dwNotifyCode);
 	}
 
+	virtual DWORD STDMETHODCALLTYPE FastFileResize (BSTR filePath, __int64 fileSize)
+	{
+		return BaseCom::FastFileResize (filePath, fileSize);
+	}
+
 protected:
 	DWORD MessageThreadId;
 	LONG RefCount;
@@ -335,3 +340,29 @@ extern "C" BOOL UacWriteLocalMachineRegistryDword (HWND hwndDlg, wchar_t *keyPat
 	}
 }
 
+extern "C" DWORD UacFastFileCreation (HWND hWnd, wchar_t* filePath, __int64 fileSize)
+{
+	CComPtr<ITrueCryptFormatCom> tc;
+	DWORD r;
+
+	CoInitialize (NULL);
+
+	if (ComGetInstance (hWnd, &tc))
+	{
+		CComBSTR filePathBstr;
+		BSTR bstr = W2BSTR(filePath);
+		if (bstr)
+		{
+			filePathBstr.Attach (bstr);
+			r = tc->FastFileResize (filePathBstr, fileSize);
+		}
+		else
+			r = ERROR_OUTOFMEMORY;
+	}
+	else
+		r = GetLastError();
+
+	CoUninitialize ();
+
+	return r;
+}
diff --git a/src/Format/FormatCom.h b/src/Format/FormatCom.h
index 5ab6bd52..e474608d 100644
--- a/src/Format/FormatCom.h
+++ b/src/Format/FormatCom.h
@@ -30,6 +30,7 @@ int UacAnalyzeHiddenVolumeHost (HWND hwndDlg, int *driveNo, __int64 hiddenVolHos
 int UacFormatVolume (char *cvolumePath , BOOL bDevice , unsigned __int64 size , unsigned __int64 hiddenVolHostSize , Password *password , int cipher , int pkcs5 , BOOL quickFormat, BOOL sparseFileSwitch, int fileSystem , int clusterSize, HWND hwndDlg , BOOL hiddenVol , int *realClusterSize);
 BOOL UacUpdateProgressBar (__int64 nSecNo, BOOL *bVolTransformThreadCancel);
 BOOL UacWriteLocalMachineRegistryDword (HWND hwndDlg, wchar_t *keyPath, wchar_t *valueName, DWORD value);
+DWORD UacFastFileCreation (HWND hWnd, wchar_t* filePath, __int64 fileSize);
 
 #ifdef __cplusplus
 }
diff --git a/src/Format/FormatCom.idl b/src/Format/FormatCom.idl
index cae4e155..7276de81 100644
--- a/src/Format/FormatCom.idl
+++ b/src/Format/FormatCom.idl
@@ -50,6 +50,7 @@ library TrueCryptFormatCom
 		DWORD UpdateSetupConfigFile (BOOL bForInstall);
 		DWORD GetSecureBootConfig (BOOL* pSecureBootEnabled, BOOL *pVeraCryptKeysLoaded);
 		DWORD NotifyService (DWORD dwNotifyCode);
+		DWORD FastFileResize (BSTR  filePath, __int64 fileSize);
 	};
 
 	[