Array size limited to 255 in rosserial

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I'm trying to send a PointCloud2 message from a windows machine to the ROS master via rosserial_windows. The message includes a data array that needs to hold 512x424x2 bytes, but the data_length field as generated by rosserial is a uint8 and limited to 255. Is there a way to make a larger array, or is this something that needs to be modified in rosserial?