int n = align(boundary);
        int i = n;
        while (i > 0) {
            buf[index - i] = value;
            i--;
        }
        return n;
    }
    public void writeOctetArray(byte[] b, int i, int l) {
        System.arraycopy(b, i, buf, index, l);
        advance(l);
    }
    public void readOctetArray(byte[] b, int i, int l) {
        System.arraycopy(buf, index, b, i, l);

        int i = n;
        while ( i > 0 ) {
            this.buf[ this.index - i ] = value;
            i--;
        }
        return n;
    }


    public void writeOctetArray ( byte[] b, int i, int l ) {
        System.arraycopy(b, i, this.buf, this.index, l);
        advance(l);
    }


    public void readOctetArray ( byte[] b, int i, int l ) {