return buf;
        }
    }
    static void getBuffers( SmbComTransaction req, SmbComTransactionResponse rsp ) {
        synchronized( cache ) {
            req.txn_buf = getBuffer();
            rsp.txn_buf = getBuffer();
        }
    }
    static public void releaseBuffer( byte[] buf ) {
        synchronized( cache ) {
            if (freeBuffers < MAX_BUFFERS) {