Use this function to write 16 bits in native format to a SDL_RWops as big-endian data.
size_t SDL_WriteBE16(SDL_RWops* dst, Uint16 value)
the stream to which data will be written
the data to be written, in native format
Returns 1 on successful write, 0 on error.
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SDL byteswaps the data only if necessary, so the application always specifies native format, and the data written will be in big-endian format.