if( errorCode != 0 || andxCommand == (byte)0xFF ) {
            andxCommand = (byte)0xFF;
            andx = null;
        } else if( andx == null ) {
            andxCommand = (byte)0xFF;
            throw new RuntimeException( "no andx command supplied with response" );
        } else {

            /*
             * Set bufferIndex according to andxOffset
             */

        this.length = len;

        if ( isRetainPayload() ) {
            byte[] payload = new byte[len];
            System.arraycopy(buffer, 4, payload, 0, len);
            setRawPayload(payload);
        }

        if ( !verifySignature(buffer, 4, len) ) {
            throw new SMBProtocolDecodingException("Signature verification failed for " + this.getClass().getName());
        }
        return len;