err = write_uint32_bigendian(world->seed, file);
err = err | write_uint32_bigendian(world->turn, file);
err = err | write_uint16_bigendian(world->player->pos.y + 1, file);
err = write_uint32_bigendian(world->seed, file);
err = err | write_uint32_bigendian(world->turn, file);
err = err | write_uint16_bigendian(world->player->pos.y + 1, file);