code: func (log *Log) AddBinary(b []byte) int64 {
  
  	i, _ := log.f.Seek(0, 2)
  	log.f.Write(b)
  
  	if log.autoSync {
  		log.f.Sync()
  	}
  
  	return i
  }
docs: // AddBinary adds an OGDL binary object to the log. The starting position into
  // the log is returned.