srcBuf := bytes.NewBuffer(make([]byte, 8192))
	src := NewReader(onlyReader{srcBuf})
	dstBuf := new(bytes.Buffer)
	dst := onlyWriter{dstBuf}
	for i := 0; i < b.N; i++ {
		srcBuf.Reset()
		src.Reset(onlyReader{srcBuf})
		dstBuf.Reset()
		io.Copy(dst, src)
	}
}

func BenchmarkReaderCopyNoWriteTo(b *testing.B) {
	srcBuf := bytes.NewBuffer(make([]byte, 8192))

	if err != ErrFormat {
		t.Fatalf("unexpected error, got: %v, want: %v", err, ErrFormat)
	}

	// Also check that an archive containing a handful of empty
	// files doesn't cause an issue
	b := bytes.NewBuffer(nil)
	w := NewWriter(b)
	for i := 0; i < 5; i++ {
		_, err := w.Create("")
		if err != nil {
			t.Fatalf("Writer.Create failed: %s", err)
		}
	}
	if err := w.Close(); err != nil {