b = b[:len(a)]
	for i, av := range a {
		if b[i] != av {
			return i
		}
	}
	return max
}

// encSpeed will compress and store the currently added data,
// if enough has been accumulated or we at the end of the stream.
// Any error that occurred will be in d.err
func (d *compressor) encSpeed() {
	// We only compress if we have maxStoreBlockSize.
	if d.windowEnd < maxStoreBlockSize {
		if !d.sync {
			return

	}
	t.Logf("got %d bytes", len(out1))
}

// TestBestSpeed tests that round-tripping through deflate and then inflate
// recovers the original input. The Write sizes are near the thresholds in the
// compressor.encSpeed method (0, 16, 128), as well as near maxStoreBlockSize
// (65535).
func TestBestSpeed(t *testing.T) {
	t.Parallel()
	abc := make([]byte, 128)
	for i := range abc {
		abc[i] = byte(i)
	}