4 examples of 'atob nodejs' in JavaScript

6
function atob(str) {
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  // normal window
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  if ('function' === typeof a2b) {
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    return a2b(str);
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  }
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  // browserify (web worker)
12
  else if ('function' === typeof Buffer) {
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    return new Buffer(str, 'base64').toString('binary');
14
  }
15
  // ios web worker with base64js
16
  else if ('object' === typeof w.base64js) {
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    // bufferToBinaryString
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    // https://github.com/coolaj86/unibabel-js/blob/master/index.js#L50
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    var buf = w.base64js.b64ToByteArray(str);
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    return Array.prototype.map.call(buf, function (ch) {
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      return String.fromCharCode(ch);
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    }).join('');
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  }
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  // ios web worker without base64js
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  else {
27
    throw new Error("you're probably in an ios webworker. please include use beatgammit's base64-js");
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  }
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}

61
function atob(input) {
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  input = String(input);
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  var position = 0,
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      output = [],
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      buffer = 0, bits = 0, n;
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  input = input.replace(/\s/g, '');
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  if ((input.length % 4) === 0) { input = input.replace(/=+$/, ''); }
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  if ((input.length % 4) === 1) { throw Error("InvalidCharacterError"); }
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  if (/[^+/0-9A-Za-z]/.test(input)) { throw Error("InvalidCharacterError"); }
71
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  while (position < input.length) {
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    n = B64_ALPHABET.indexOf(input.charAt(position));
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    buffer = (buffer << 6) | n;
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    bits += 6;
76
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    if (bits === 24) {
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      output.push(String.fromCharCode((buffer >> 16) & 0xFF));
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      output.push(String.fromCharCode((buffer >>  8) & 0xFF));
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      output.push(String.fromCharCode(buffer & 0xFF));
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      bits = 0;
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      buffer = 0;
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    }
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    position += 1;
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  }
86
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  if (bits === 12) {
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    buffer = buffer >> 4;
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    output.push(String.fromCharCode(buffer & 0xFF));
90
  } else if (bits === 18) {
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    buffer = buffer >> 2;
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    output.push(String.fromCharCode((buffer >> 8) & 0xFF));
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    output.push(String.fromCharCode(buffer & 0xFF));
94
  }
95
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  return output.join('');
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};

10
function browserAtob(input) {
11
  try {
12
    return window.atob(input);
13
  } catch (e) {
14
    return null;
15
  }
16
}

94
function atob( coded ) {
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	var i;
96
97
	if ( ! c ) {
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		init();
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	}
100
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	coded = coded.replace( /[^A-Za-z0-9\+\/\=]/g, '' );
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	coded = String(coded).split('=');
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	i = coded.length;
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	do {
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		--i;
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		coded[i] = code( coded[i], true, r64, a256, 6, 8 );
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	} while ( i > 0 );
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	coded = coded.join('');
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	return coded;
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}