Use this function to read 16 bits of big-endian data from an SDL_RWops and return in native format.
Uint16 SDL_ReadBE16(SDL_RWops * src);
the stream from which to read data
Returns 16 bits of data in the native byte order of the platform.
SDL byteswaps the data only if necessary, so the data returned will be in the native byte order.
This function is available since SDL 2.0.0.