X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=MdePkg%2FLibrary%2FBaseMemoryLibOptDxe%2FCompareMemWrapper.c;h=c59000dc04f69bd35ae348800e3b051882423dd1;hb=0677cc4925d580f7016ac092dc591be0ebe03495;hp=ccd38e1aef581e04aabd9fd74b32146242ce5ee7;hpb=631f060bb7fb457ff8720a690f4bdd378328cb2d;p=mirror_edk2.git

diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/CompareMemWrapper.c b/MdePkg/Library/BaseMemoryLibOptDxe/CompareMemWrapper.c
index ccd38e1aef..c59000dc04 100644
--- a/MdePkg/Library/BaseMemoryLibOptDxe/CompareMemWrapper.c
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/CompareMemWrapper.c
@@ -1,30 +1,26 @@
 /** @file
   CompareMem() implementation.
 
-  Copyright (c) 2006, Intel Corporation<BR>
-  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.
-
-  The following BaseMemoryLib instances share the same version of this file:
-
+  The following BaseMemoryLib instances contain the same copy of this file:
     BaseMemoryLib
     BaseMemoryLibMmx
     BaseMemoryLibSse2
     BaseMemoryLibRepStr
+    BaseMemoryLibOptDxe
+    BaseMemoryLibOptPei
     PeiMemoryLib
-    DxeMemoryLib
+    UefiMemoryLib
 
-**/
+Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+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.
 
-//
-// Include common header file for this module.
-//
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
+**/
 
 #include "MemLibInternals.h"
 
@@ -35,20 +31,20 @@
   If all Length bytes of the two buffers are identical, then 0 is returned.  Otherwise, the
   value returned is the first mismatched byte in SourceBuffer subtracted from the first
   mismatched byte in DestinationBuffer.
-  If Length > 0 and DestinationBuffer is NULL and Length > 0, then ASSERT().
-  If Length > 0 and SourceBuffer is NULL and Length > 0, then ASSERT().
-  If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT(). 
-  If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT(). 
-
+  
+  If Length > 0 and DestinationBuffer is NULL, then ASSERT().
+  If Length > 0 and SourceBuffer is NULL, then ASSERT().
+  If Length is greater than (MAX_ADDRESS - DestinationBuffer + 1), then ASSERT().
+  If Length is greater than (MAX_ADDRESS - SourceBuffer + 1), then ASSERT().
 
-  @param  DestinationBuffer Pointer to the destination buffer to compare.
-  @param  SourceBuffer      Pointer to the source buffer to compare.
-  @param  Length            Number of bytes to compare.
+  @param  DestinationBuffer The pointer to the destination buffer to compare.
+  @param  SourceBuffer      The pointer to the source buffer to compare.
+  @param  Length            The number of bytes to compare.
 
   @return 0                 All Length bytes of the two buffers are identical.
   @retval Non-zero          The first mismatched byte in SourceBuffer subtracted from the first
                             mismatched byte in DestinationBuffer.
-
+                            
 **/
 INTN
 EFIAPI
@@ -58,7 +54,7 @@ CompareMem (
   IN UINTN       Length
   )
 {
-  if (Length == 0) {
+  if (Length == 0 || DestinationBuffer == SourceBuffer) {
     return 0;
   }
   ASSERT (DestinationBuffer != NULL);