javascript Buffer from several variables

Question

How is it possible in javascript to obtain the b Buffer in a way simpler than the following?

  var num=6553599

  var a = new Buffer(4); 
  a.writeInt32LE(num); 

  var up=a.readUInt8(2); 
  var mid=a.readUInt8(1);   
  var low=a.readUInt8(0);    

  var b=new Buffer(6);
  b.writeUInt8('T'.charCodeAt(0),0);      
  b.writeUInt8(up  ,1); 
  b.writeUInt8(mid ,2);
  b.writeUInt8(low ,3); 
  b.writeUInt8(0   ,4); 
  b.writeUInt8(1   ,5);

galileopy · Accepted Answer · 2016-12-12 22:08:08Z

1

If performance is not an issue you can use the string representation of buffers to work with them more easily.

Usually I prefer the hex representation of buffers since they're easier to read and it is easy to count bytes this way.

var bConcat = (a, b) => new Buffer(a.toString("hex") + b.toString("hex"), "hex");
var reducer = (acc, current)=> bConcat(acc, current);
var num=6553599
var a = new Buffer(4);
var t = 'T'.charCodeAt(0);
a.writeInt32LE(num); 
var head = new Buffer(t.toString(16), "hex");
var tail = new Buffer("0001", "hex");
var b = [head, a.slice(0,3).reverse(), tail].reduce(reducer);

answered Dec 12, 2016 at 22:08

galileopy

2463 silver badges11 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

javascript Buffer from several variables

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related