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diff --git a/Core/EfiFirmwareFileSystem.h b/Core/EfiFirmwareFileSystem.h
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+/*++
+
+Copyright (c) 2004, Intel Corporation                                                         
+All rights reserved. This program and the accompanying materials                          
+are licensed and made available under the terms and conditions of the BSD License         
+which accompanies this distribution.  The full text of the license may be found at        
+http://opensource.org/licenses/bsd-license.php                                            
+                                                                                          
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+Module Name:
+
+  EfiFirmwareFileSystem.h
+
+Abstract:
+
+  This file defines the data structures that comprise the FFS file system.
+
+--*/
+
+#ifndef _EFI_FFS_FILE_SYSTEM_H_
+#define _EFI_FFS_FILE_SYSTEM_H_
+
+#include <FFS.h>
+
+//
+// FFS_FIXED_CHECKSUM is the default checksum value used when the
+// FFS_ATTRIB_CHECKSUM attribute bit is clear
+// note this is NOT an architecturally defined value, but is in this file for
+// implementation convenience
+//
+#define FFS_FIXED_CHECKSUM  0x5A
+
+#define EFI_FILE_ALL_STATE_BITS       (EFI_FILE_HEADER_CONSTRUCTION | \
+                                 EFI_FILE_HEADER_VALID | \
+                                 EFI_FILE_DATA_VALID | \
+                                 EFI_FILE_MARKED_FOR_UPDATE | \
+                                 EFI_FILE_DELETED | \
+                                 EFI_FILE_HEADER_INVALID \
+          )
+
+#define EFI_TEST_FFS_ATTRIBUTES_BIT(FvbAttributes, TestAttributes, Bit) \
+    ( \
+      (BOOLEAN) ( \
+          (FvbAttributes & EFI_FVB_ERASE_POLARITY) ? (((~TestAttributes) & Bit) == Bit) : ((TestAttributes & Bit) == Bit) \
+        ) \
+    )
+#endif