Function IsZeroGuid

MdePkg/Library/UefiMemoryLib/MemLibGuid.c:152–165

Checks if the given GUID is a zero GUID. This function checks whether the given GUID is a zero GUID. If the GUID is identical to a zero GUID then TRUE is returned. Otherwise, FALSE is returned. If Guid is NULL, then ASSERT(). @param Guid The pointer to a 128 bit GUID. @retval TRUE Guid is a zero GUID. @retval FALSE Guid is not a zero GUID. **/

**/
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);
}