// an io.SectionReader which would access a slice at a negative offset
	// as the section reader offset & size were < 0.
	NewReader(bytes.NewReader(data), int64(len(data))+1875)
}

func BenchmarkReaderOneDeepDir(b *testing.B) {
	var buf bytes.Buffer
	zw := NewWriter(&buf)

	for i := range 4000 {
		name := strings.Repeat("a/", i) + "data"
		zw.CreateHeader(&FileHeader{
			Name:   name,