public void align ( int mask ) throws IOException {
        int position = this.size - this.dis.available();
        int shift = position & mask - 1;
        if ( mask != 0 && shift != 0 )
            this.dis.skip(mask - shift);
    }


    public int available () throws IOException {
        return this.dis.available();
    }


    public void readFully ( byte[] b ) throws IOException {