Function StrToGuid

MdePkg/Library/BaseLib/SafeString.c:1514–1590

Convert a Null-terminated Unicode GUID string to a value of type EFI_GUID. This function outputs a GUID value by interpreting the contents of the Unicode string specified by String. The format of the input Unicode string String consists of 36 characters, as follows: aabbccdd-eeff-gghh-iijj-kkllmmnnoopp The pairs aa - pp are two characters in the range [0-9],

**/
RETURN_STATUS
EFIAPI
StrToGuid (
  IN  CONST CHAR16       *String,
  OUT GUID               *Guid
  )
{
  RETURN_STATUS          Status;
  GUID                   LocalGuid;

  ASSERT (((UINTN) String & BIT0) == 0);

  //
  // 1. None of String or Guid shall be a null pointer.
  //
  SAFE_STRING_CONSTRAINT_CHECK ((String != NULL), RETURN_INVALID_PARAMETER);
  SAFE_STRING_CONSTRAINT_CHECK ((Guid != NULL), RETURN_INVALID_PARAMETER);

  //
  // Get aabbccdd in big-endian.
  //
  Status = StrHexToBytes (String, 2 * sizeof (LocalGuid.Data1), (UINT8 *) &LocalGuid.Data1, sizeof (LocalGuid.Data1));
  if (RETURN_ERROR (Status) || String[2 * sizeof (LocalGuid.Data1)] != L'-') {
    return RETURN_UNSUPPORTED;
  }
  //
  // Convert big-endian to little-endian.
  //
  LocalGuid.Data1 = SwapBytes32 (LocalGuid.Data1);
  String += 2 * sizeof (LocalGuid.Data1) + 1;

  //
  // Get eeff in big-endian.
  //
  Status = StrHexToBytes (String, 2 * sizeof (LocalGuid.Data2), (UINT8 *) &LocalGuid.Data2, sizeof (LocalGuid.Data2));
  if (RETURN_ERROR (Status) || String[2 * sizeof (LocalGuid.Data2)] != L'-') {
    return RETURN_UNSUPPORTED;
  }
  //
  // Convert big-endian to little-endian.
  //
  LocalGuid.Data2 = SwapBytes16 (LocalGuid.Data2);
  String += 2 * sizeof (LocalGuid.Data2) + 1;

  //
  // Get gghh in big-endian.
  //
  Status = StrHexToBytes (String, 2 * sizeof (LocalGuid.Data3), (UINT8 *) &LocalGuid.Data3, sizeof (LocalGuid.Data3));
  if (RETURN_ERROR (Status) || String[2 * sizeof (LocalGuid.Data3)] != L'-') {
    return RETURN_UNSUPPORTED;
  }
  //
  // Convert big-endian to little-endian.
  //
  LocalGuid.Data3 = SwapBytes16 (LocalGuid.Data3);
  String += 2 * sizeof (LocalGuid.Data3) + 1;

  //