var size int
	for {
		b, err := cr.reader.ReadByte()
		if err == io.EOF {
			err = io.ErrUnexpectedEOF
		}
		if err != nil {
			cr.err = err
			return n, cr.err
		}
		if b == '\r' { // \r\n denotes end of size.
			err := mustRead('\n')
			if err != nil {
				cr.err = err
				return n, cr.err
			}
			break
		}

		// Manually deserialize the size since AWS specified