MemLibGuid.c

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#include "MemLibInternals.h"
 
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;
}
 
BOOLEAN
EFIAPI
CompareGuid (
  IN CONST GUID  *Guid1,
  IN CONST GUID  *Guid2
  )
{
  UINT64  LowPartOfGuid1;
  UINT64  LowPartOfGuid2;
  UINT64  HighPartOfGuid1;
  UINT64  HighPartOfGuid2;
 
  LowPartOfGuid1  = ReadUnaligned64 ((CONST UINT64 *)Guid1);
  LowPartOfGuid2  = ReadUnaligned64 ((CONST UINT64 *)Guid2);
  HighPartOfGuid1 = ReadUnaligned64 ((CONST UINT64 *)Guid1 + 1);
  HighPartOfGuid2 = ReadUnaligned64 ((CONST UINT64 *)Guid2 + 1);
 
  return (BOOLEAN)(LowPartOfGuid1 == LowPartOfGuid2 && HighPartOfGuid1 == HighPartOfGuid2);
}
 
VOID *
EFIAPI
ScanGuid (
  IN CONST VOID  *Buffer,
  IN UINTN       Length,
  IN CONST GUID  *Guid
  )
{
  CONST GUID  *GuidPtr;
 
  ASSERT (((UINTN)Buffer & (sizeof (Guid->Data1) - 1)) == 0);
  ASSERT (Length <= (MAX_ADDRESS - (UINTN)Buffer + 1));
  ASSERT ((Length & (sizeof (*GuidPtr) - 1)) == 0);
 
  GuidPtr = (GUID *)Buffer;
  Buffer  = GuidPtr + Length / sizeof (*GuidPtr);
  while (GuidPtr < (CONST GUID *)Buffer) {
    if (CompareGuid (GuidPtr, Guid)) {
      return (VOID *)GuidPtr;
    }
 
    GuidPtr++;
  }
 
  return NULL;
}
 
BOOLEAN
EFIAPI
IsZeroGuid (
  IN CONST GUID  *Guid
  )
{
  UINT64  LowPartOfGuid;
  UINT64  HighPartOfGuid;
 
  LowPartOfGuid  = ReadUnaligned64 ((CONST UINT64 *)Guid);
  HighPartOfGuid = ReadUnaligned64 ((CONST UINT64 *)Guid + 1);
 
  return (BOOLEAN)(LowPartOfGuid == 0 && HighPartOfGuid == 0);
}