CODEWITHSUNDEEP
javascriptarraysnode.jsstream
Kirk Ouimet
Kirk Ouimet

Reputation: 28364

Converting Uint8Array into Stream with Node JS

What's the best way to take a native JavaScript Uint8Array and turn it into a readable or transform Stream?

I figured out how to turn Uint8Array's into Buffers, not sure if this helps:

var uint8array = new Uint8Array();
var buffer = new Buffer(uint8array);

Upvotes: 3

Views: 12669

Answers (2)

suda
suda

Reputation: 2644

What made it work for me was using Duplex instead of Readable (credit goes to Brian Mancini ):

import { Duplex } from 'stream';
// Or non ES6 syntax:
// const Duplex = require('stream').Duplex
let stream = new Duplex();
stream.push(buffer);
stream.push(null);
stream.pipe(process.stdout);

Upvotes: 3

Ben
Ben

Reputation: 10104

The standard way would be to define a readable stream with a _read method:

var Stream = require('stream');

var myStream = new Stream.Readable();
var i = 0;
var data = [1, 2, 3, 4];

myStream._read = function(size) {
  var pushed = true;
  while (pushed && i < data.length) {
    pushed = this.push(data[i++]);
  }

  if (i === data.length) {
    this.push(null);
  }
};

myStream.pipe(somewhere);

However, you can also use event-stream's readArray method:

var es = require('event-stream');
var data = [1, 2, 3, 4];
var myStream = es.readArray(data);

myStream.pipe(somewhere);

Upvotes: 3

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