Decode UFT8 js

decodeUTF8.js

// to avoid using decodeURIComponent(escape(s)) because escape() is not recommended anymore on Ecmascript spec (see MDN).
// more info here about this: http://ecmanaut.blogspot.com/2006/07/encoding-decoding-utf8-in-javascript.html
function decodeUTF8(utftext) {
  var string = "";
  var i = 0;
  var c = (c1 = c2 = 0);

  while (i < utftext.length) {
    c = utftext.charCodeAt(i);

    if (c < 128) {
      string += String.fromCharCode(c);
      i++;
    } else if (c > 191 && c < 224) {
      c2 = utftext.charCodeAt(i + 1);
      string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
      i += 2;
    } else {
      c2 = utftext.charCodeAt(i + 1);
      c3 = utftext.charCodeAt(i + 2);
      string += String.fromCharCode(
        ((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)
      );
      i += 3;
    }
  }

  return string;
}