vdelta(table, data, aLength, data.length, true);
vdelta(table, data, aLength, dataLength, true);
    public void computeDelta(byte[] a, int aLength, byte[] b, int bLength) {        byte[] data = new byte[aLength + bLength];        System.arraycopy(a, 0, data, 0, aLength);        System.arraycopy(b, 0, data, aLength, bLength);                SlotsTable table = new SlotsTable(data.length);                vdelta(table, data, 0, aLength, false);        vdelta(table, data, aLength, data.length, true);            }