throw new SMBProtocolDecodingException("Invalid maxReadSize: " + this.maxReadSize + " (must be 0-16777216)");
        }
        if (this.maxWriteSize < 0 || this.maxWriteSize > 16777216) { // 16MB max
            throw new SMBProtocolDecodingException("Invalid maxWriteSize: " + this.maxWriteSize + " (must be 0-16777216)");
        }

        bufferIndex += 12;

        // Validate sufficient buffer space for timestamps and offsets

        setPrivateField(response, "capabilities", Smb2Constants.SMB2_GLOBAL_CAP_DFS);
        setPrivateField(response, "maxReadSize", 65536);
        setPrivateField(response, "maxWriteSize", 65536);
        setPrivateField(response, "maxTransactSize", 65536);

        // Setup valid request
        when(mockRequest.isSigningEnforced()).thenReturn(false);

        SMBUtil.writeInt4(1024 * 1024, buffer, 28); // maxTransactSize
        SMBUtil.writeInt4(1024 * 1024, buffer, 32); // maxReadSize
        SMBUtil.writeInt4(1024 * 1024, buffer, 36); // maxWriteSize

        // System time and server start time
        SMBUtil.writeTime(System.currentTimeMillis(), buffer, 40);
        SMBUtil.writeTime(System.currentTimeMillis(), buffer, 48);