System.arraycopy(this.sbuf, 4, buffer, 0, Smb2Constants.SMB2_HEADER_LENGTH);
            readn(this.in, buffer, Smb2Constants.SMB2_HEADER_LENGTH, rl - Smb2Constants.SMB2_HEADER_LENGTH);

            cur.setReadSize(rl);
            int len = cur.decode(buffer, 0);

            if ( len > rl ) {
                throw new IOException(String.format("WHAT? ( read %d decoded %d ): %s", rl, len, cur));
            }