1 files changed, 131 insertions, 0 deletions
diff --git a/MdePkg/Library/PeiMemoryLib/MemLibGuid.c b/MdePkg/Library/PeiMemoryLib/MemLibGuid.c
new file mode 100644
index 0000000000..06b2721c64
--- /dev/null
+++ b/MdePkg/Library/PeiMemoryLib/MemLibGuid.c
@@ -0,0 +1,131 @@
+/** @file
+  Implementation of GUID functions.
+
+  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.
+
+  Module Name:  MemLibGuid.c
+
+  The following BaseMemoryLib instances share the same version of this file:
+
+    BaseMemoryLib
+    BaseMemoryLibMmx
+    BaseMemoryLibSse2
+    BaseMemoryLibRepStr
+    PeiMemoryLib
+    UefiMemoryLib
+
+**/
+
+/**
+  This function copies a source GUID to a destination GUID.
+
+  This function copies the contents of the 128-bit GUID specified by SourceGuid
+  to DestinationGuid, and returns DestinationGuid.
+
+  If DestinationGuid is NULL, then ASSERT().
+  If SourceGuid is NULL, then ASSERT().
+
+  @param  DestinationGuid Pointer to the destination GUID.
+  @param  SourceGuid Pointer to the source GUID.
+
+  @return DestinationGuid
+
+**/
+GUID *
+EFIAPI
+CopyGuid (
+  OUT     GUID                      *DestinationGuid,
+  IN      CONST GUID                *SourceGuid
+  )
+{
+  WriteUnaligned64 (
+    (UINT64*)DestinationGuid,
+    ReadUnaligned64 ((CONST UINT64*)SourceGuid)
+    );
+  WriteUnaligned64 (
+    (UINT64*)DestinationGuid + 1,
+    ReadUnaligned64 ((CONST UINT64*)SourceGuid + 1)
+    );
+  return DestinationGuid;
+}
+
+/**
+  Compares two GUIDs
+
+  This function compares Guid1 to Guid2. If the GUIDs are identical then TRUE
+  is returned. If there are any bit differences in the two GUIDs, then FALSE is
+  returned.
+
+  If Guid1 is NULL, then ASSERT().
+  If Guid2 is NULL, then ASSERT().
+
+  @param  Guid1 guid to compare
+  @param  Guid2 guid to compare
+
+  @retval TRUE  if Guid1 == Guid2
+  @retval FALSE if Guid1 != Guid2
+
+**/
+BOOLEAN
+EFIAPI
+CompareGuid (
+  IN      CONST GUID                *Guid1,
+  IN      CONST GUID                *Guid2
+  )
+{
+  return (BOOLEAN)(
+           ReadUnaligned64 ((CONST UINT64*)Guid1)
+             == ReadUnaligned64 ((CONST UINT64*)Guid2) &&
+           ReadUnaligned64 ((CONST UINT64*)Guid1 + 1)
+             == ReadUnaligned64 ((CONST UINT64*)Guid2 + 1)
+           );
+}
+
+/**
+  Scans a target buffer for a GUID, and returns a pointer to the matching GUID
+  in the target buffer.
+
+  This function searches target the buffer specified by Buffer and Length from
+  the lowest address to the highest address at 128-bit increments for the
+  128-bit GUID value that matches Guid. If a match is found, then a pointer to
+  the matching GUID in the target buffer is returned. If no match is found,
+  then NULL is returned. If Length is 0, then NULL is returned.
+
+  If Buffer is NULL, then ASSERT().
+  If Buffer is not aligned on a 64-bit boundary, then ASSERT().
+  If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
+
+  @param  Buffer  Pointer to the target buffer to scan.
+  @param  Length  Number of bytes in Buffer to scan.
+  @param  Guid    Value to search for in the target buffer.
+
+  @return Pointer to the first occurrence.
+  @retval NULL  if Length == 0 or Guid was not found.
+**/
+VOID *
+EFIAPI
+ScanGuid (
+  IN      CONST VOID                *Buffer,
+  IN      UINTN                     Length,
+  IN      CONST GUID                *Guid
+  )
+{
+  CONST GUID                        *GuidPtr;
+
+  GuidPtr = (GUID*)Buffer;
+  Buffer = GuidPtr + Length / sizeof (*GuidPtr);
+  while (GuidPtr < (CONST GUID*)Buffer) {
+    if (CompareGuid (GuidPtr, Guid)) {
+      return (VOID*)GuidPtr;
+    }
+    GuidPtr++;
+  }
+  return NULL;
+}