Convert a base64 string into a binary Uint8 Array

gistfile1.js

var BASE64_MARKER = ';base64,';

function convertDataURIToBinary(dataURI) {
  var base64Index = dataURI.indexOf(BASE64_MARKER) + BASE64_MARKER.length;
  var base64 = dataURI.substring(base64Index);
  var raw = window.atob(base64);
  var rawLength = raw.length;
  var array = new Uint8Array(new ArrayBuffer(rawLength));

  for(i = 0; i < rawLength; i++) {
    array[i] = raw.charCodeAt(i);
  }
  return array;
}

It can be even shorter (1 line): https://gist.github.com/av01d/e60f6edf3c5be6cd403eabb3d1f838f4

A note on the one-liners: While Uint8Array.from(atob(base64), (v) => v.charCodeAt(0)); really looks nice, I ran into memory issues on Chrome when converting a 200MB binary while the for-loop worked flawlessly

Uncaught DOMException: String contains an invalid character
convertDataURIToBinary debugger eval code:6
downloadFile debugger eval code:17
debugger eval code:1