diff options
Diffstat (limited to 'EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/EfiCompareMem.c')
-rw-r--r-- | EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/EfiCompareMem.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/EfiCompareMem.c b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/EfiCompareMem.c new file mode 100644 index 0000000000..d640b9dc68 --- /dev/null +++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/EfiCompareMem.c @@ -0,0 +1,76 @@ +/*++
+
+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:
+
+ EfiCompareMem.c
+
+Abstract:
+
+ Generic compare-memory routine.
+
+--*/
+
+#include "Tiano.h"
+#include "EfiDriverLib.h"
+
+
+INTN
+EfiCompareMem (
+ IN VOID *MemOne,
+ IN VOID *MemTwo,
+ IN UINTN Length
+ )
+/*++
+
+Routine Description:
+
+ Compares two memory buffers of a given length.
+
+Arguments:
+
+ MemOne - First memory buffer
+
+ MemTwo - Second memory buffer
+
+ Len - Length of Mem1 and Mem2 memory regions to compare
+
+Returns:
+
+ = 0 if MemOne == MemTwo
+
+--*/
+{
+ INTN ReturnValue;
+
+ if (!(EFI_UINTN_ALIGNED (MemOne) || EFI_UINTN_ALIGNED (MemTwo) || EFI_UINTN_ALIGNED (Length))) {
+ //
+ // If Destination/Source/Length are aligned do UINTN conpare
+ //
+ for (; Length > 0; Length -= sizeof (INTN), MemOne = (VOID *)((UINTN)MemOne + sizeof (INTN)), MemTwo = (VOID *)((UINTN)MemTwo + sizeof (INTN))) {
+ if (*(INTN *)MemOne != *(INTN *)MemTwo) {
+ break;
+ }
+ }
+ }
+
+ //
+ // If Destination/Source/Length not aligned do byte compare
+ //
+ for (; Length > 0; Length--, MemOne = (VOID *)((UINTN)MemOne + 1), MemTwo = (VOID *)((UINTN)MemTwo + 1)) {
+ ReturnValue = (INTN)(*(INT8 *)MemOne - *(INT8 *)MemTwo);
+ if (ReturnValue != 0) {
+ return ReturnValue;
+ }
+ }
+
+ return 0;
+}
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