Fixed code

index.js

  function packFORMAT (data){
    var body = BSON.serialize(data);
    var cbody = Buffer(algorithm.compressFile(body),"binary");
    var final = Buffer.concat([Buffer.from("MAGIC", "binary"), Buffer.from([data.origin.majorVersion,0x4,0x99,0x60])])
    var dlen = body.length;
    final = Buffer.concat([final,Buffer([dlen,dlen>>8,dlen>>16,dlen>>24],"binary")])
    final = Buffer.concat([final,Buffer(cbody,"binary")]);
    return final.toString("binary");
  }