}
			return
		}

		// t.remainder is a slice at the beginning of t.inBuf
		// containing a partial key sequence
		readBuf := t.inBuf[len(t.remainder):]
		var n int

		t.lock.Unlock()
		n, err = t.c.Read(readBuf)
		t.lock.Lock()

		if err != nil {
			return
		}

		t.remainder = t.inBuf[:n+len(t.remainder)]
	}
}