return "Bad digest: Expected " + e.ExpectedMD5 + " does not match calculated " + e.CalculatedMD5
}

// SizeTooSmall reader size too small
type SizeTooSmall struct {
	Want int64
	Got  int64
}

func (e SizeTooSmall) Error() string {
	return fmt.Sprintf("Size small: got %d, want %d", e.Got, e.Want)
}

// SizeTooLarge reader size too large
type SizeTooLarge struct {
	Want int64
	Got  int64
}