MdePkg: Clean up source files

[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibSse2 / MemLibGuid.c

diff --git a/MdePkg/Library/BaseMemoryLibSse2/MemLibGuid.c b/MdePkg/Library/BaseMemoryLibSse2/MemLibGuid.c
index b315ff5322ad1f16f1530c385984eacc277b1723..4cc95d3aab563392e6901f2ee5bf24d8cb5aadfd 100644 (file)
--- a/MdePkg/Library/BaseMemoryLibSse2/MemLibGuid.c
+++ b/MdePkg/Library/BaseMemoryLibSse2/MemLibGuid.c
@@ -2,7 +2,7 @@
   Implementation of GUID functions.\r
 \r
   The following BaseMemoryLib instances contain the same copy of this file:\r
-  \r
+\r
     BaseMemoryLib\r
     BaseMemoryLibMmx\r
     BaseMemoryLibSse2\r
@@ -12,11 +12,11 @@
     PeiMemoryLib\r
     UefiMemoryLib\r
 \r
-  Copyright (c) 2006 - 2009, Intel Corporation<BR>\r
-  All rights reserved. This program and the accompanying materials\r
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
+  This program and the accompanying materials\r
   are licensed and made available under the terms and conditions of the BSD License\r
   which accompanies this distribution.  The full text of the license may be found at\r
-  http://opensource.org/licenses/bsd-license.php\r
+  http://opensource.org/licenses/bsd-license.php.\r
 \r
   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
@@ -30,12 +30,12 @@
 \r
   This function copies the contents of the 128-bit GUID specified by SourceGuid to\r
   DestinationGuid, and returns DestinationGuid.\r
-  \r
+\r
   If DestinationGuid is NULL, then ASSERT().\r
   If SourceGuid is NULL, then ASSERT().\r
 \r
-  @param  DestinationGuid   Pointer to the destination GUID.\r
-  @param  SourceGuid        Pointer to the source GUID.\r
+  @param  DestinationGuid   The pointer to the destination GUID.\r
+  @param  SourceGuid        The pointer to the source GUID.\r
 \r
   @return DestinationGuid.\r
 \r
@@ -63,7 +63,7 @@ CopyGuid (
 \r
   This function compares Guid1 to Guid2.  If the GUIDs are identical then TRUE is returned.\r
   If there are any bit differences in the two GUIDs, then FALSE is returned.\r
-  \r
+\r
   If Guid1 is NULL, then ASSERT().\r
   If Guid2 is NULL, then ASSERT().\r
 \r
@@ -98,20 +98,20 @@ CompareGuid (
   Scans a target buffer for a GUID, and returns a pointer to the matching GUID\r
   in the target buffer.\r
 \r
-  This function searches target the buffer specified by Buffer and Length from\r
+  This function searches the target buffer specified by Buffer and Length from\r
   the lowest address to the highest address at 128-bit increments for the 128-bit\r
   GUID value that matches Guid.  If a match is found, then a pointer to the matching\r
   GUID in the target buffer is returned.  If no match is found, then NULL is returned.\r
   If Length is 0, then NULL is returned.\r
-  \r
+\r
   If Length > 0 and Buffer is NULL, then ASSERT().\r
   If Buffer is not aligned on a 32-bit boundary, then ASSERT().\r
   If Length is not aligned on a 128-bit boundary, then ASSERT().\r
   If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
 \r
-  @param  Buffer  Pointer to the target buffer to scan.\r
-  @param  Length  Number of bytes in Buffer to scan.\r
-  @param  Guid    Value to search for in the target buffer.\r
+  @param  Buffer  The pointer to the target buffer to scan.\r
+  @param  Length  The number of bytes in Buffer to scan.\r
+  @param  Guid    The value to search for in the target buffer.\r
 \r
   @return A pointer to the matching Guid in the target buffer or NULL otherwise.\r
 \r
@@ -140,3 +140,32 @@ ScanGuid (
   }\r
   return NULL;\r
 }\r
+\r
+/**\r
+  Checks if the given GUID is a zero GUID.\r
+\r
+  This function checks whether the given GUID is a zero GUID. If the GUID is\r
+  identical to a zero GUID then TRUE is returned. Otherwise, FALSE is returned.\r
+\r
+  If Guid is NULL, then ASSERT().\r
+\r
+  @param  Guid        The pointer to a 128 bit GUID.\r
+\r
+  @retval TRUE        Guid is a zero GUID.\r
+  @retval FALSE       Guid is not a zero GUID.\r
+\r
+**/\r
+BOOLEAN\r
+EFIAPI\r
+IsZeroGuid (\r
+  IN CONST GUID  *Guid\r
+  )\r
+{\r
+  UINT64  LowPartOfGuid;\r
+  UINT64  HighPartOfGuid;\r
+\r
+  LowPartOfGuid  = ReadUnaligned64 ((CONST UINT64*) Guid);\r
+  HighPartOfGuid = ReadUnaligned64 ((CONST UINT64*) Guid + 1);\r
+\r
+  return (BOOLEAN) (LowPartOfGuid == 0 && HighPartOfGuid == 0);\r
+}\r