this.start = index = start;
        length = 0;
        deferred = this;
    }

    public NdrBuffer derive(int idx) {
        NdrBuffer nb = new NdrBuffer(buf, start);
        nb.index = idx;
        nb.deferred = deferred;
        return nb;
    }


    
    public void reset() {
        this.index = start;
        length = 0;
        deferred = this;
    }
    public int getIndex() {

        this.length = 0;
        this.deferred = this;
    }


    public NdrBuffer derive ( int idx ) {
        NdrBuffer nb = new NdrBuffer(this.buf, this.start);
        nb.index = idx;
        nb.deferred = this.deferred;
        return nb;
    }


    public void reset () {
        this.index = this.start;
        this.length = 0;
        this.deferred = this;
    }