for _, match := range entriesTrie.PrefixMatch(fmt.Sprintf("%.5d.%s.", partNumber, etag)) {
		partFile = match
		break
	}
	return partFile
}

func partNumberToRangeSpec(oi ObjectInfo, partNumber int) *HTTPRangeSpec {
	if oi.Size == 0 || len(oi.Parts) == 0 {
		return nil
	}

	var start int64
	end := int64(-1)
	for i := 0; i < len(oi.Parts) && i < partNumber; i++ {

		oinfo, err := obj.GetObjectInfo(context.Background(), bucketName, object, ObjectOptions{})
		if err != nil {
			t.Fatalf("Object: %s Object Index %d: Unexpected err: %v", object, oindex, err)
		}

		rs := partNumberToRangeSpec(oinfo, partNumber)
		size, err := oinfo.GetActualSize()
		if err != nil {
			t.Fatalf("Object: %s Object Index %d: Unexpected err: %v", object, oindex, err)
		}

		off, length, err := rs.GetOffsetLength(size)