Get a report descriptor from a HID device.
int SDL_hid_get_report_descriptor(SDL_hid_device *dev, unsigned char *buf, size_t buf_size);
|dev||A device handle returned from SDL_hid_open().|
|buf||The buffer to copy descriptor into.|
|buf_size||The size of the buffer in bytes.|
Returns the number of bytes actually copied, or -1 on error; call SDL_GetError() for more information.
User has to provide a preallocated buffer where descriptor will be copied to. The recommended size for a preallocated buffer is 4096 bytes.