Use this function to read 64 bits of big-endian data from an SDL_IOStream
and return in native format.
SDL byteswaps the data only if necessary, so the data returned will be in
the native byte order.
This function will return false when the data stream is completely read,
and SDL_GetIOStatus() will return SDL_IO_STATUS_EOF. If false is returned
and the stream is not at EOF, SDL_GetIOStatus() will return a different
error value and SDL_GetError() will offer a human-readable message.
Use this function to read 64 bits of big-endian data from an SDL_IOStream and return in native format.
SDL byteswaps the data only if necessary, so the data returned will be in the native byte order.
This function will return false when the data stream is completely read, and SDL_GetIOStatus() will return SDL_IO_STATUS_EOF. If false is returned and the stream is not at EOF, SDL_GetIOStatus() will return a different error value and SDL_GetError() will offer a human-readable message.