{"xxxxx01234"[:9], "01234", false},
	// 8-byte needle
	{"xxxxxxxxxxxx", "01234567", false},
	{"01234567xxxx", "01234567", true},
	{"xx01234567xx", "01234567", true},
	{"xxxx01234567", "01234567", true},
	{"01234567xxxxx"[1:], "01234567", false},
	{"xxxxx01234567"[:12], "01234567", false},
	// 9-15-byte needle
	{"xxxxxxxxxxxxx", "012345678", false},
	{"012345678xxxx", "012345678", true},

		// point
		return -1, syscall.ENOENT
	}
	n = copy(buf, []byte(s))

	return n, nil
}

// GUIDFromString parses a string in the form of
// "{XXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}" into a GUID.
func GUIDFromString(str string) (GUID, error) {
	guid := GUID{}
	str16, err := syscall.UTF16PtrFromString(str)
	if err != nil {
		return guid, err
	}