btoa vs third party base64 encoder

JavaScript performance comparison

Revision 16 of this test case created by Aaron

Preparation code

<script src="https://utility-js.googlecode.com/files/utility3.js"></script>
      
<script>
Benchmark.prototype.setup = function() {
  /**
   *
   *  Base64 encode / decode
   *  http://www.webtoolkit.info/
   *
   **/
  
  Base64 = {
  
    // private property
    _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
  
    // public method for encoding
    encode: function(input) {
      var output = "";
      var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
      var i = 0;
  
      input = Base64._utf8_encode(input);
  
      while (i < input.length) {
  
        chr1 = input.charCodeAt(i++);
        chr2 = input.charCodeAt(i++);
        chr3 = input.charCodeAt(i++);
  
        enc1 = chr1 >> 2;
        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
        enc4 = chr3 & 63;
  
        if (isNaN(chr2)) {
          enc3 = enc4 = 64;
        } else if (isNaN(chr3)) {
          enc4 = 64;
        }
  
        output = output + this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) + this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
  
      }
  
      return output;
    },
  
    // public method for decoding
    decode: function(input) {
      var output = "";
      var chr1, chr2, chr3;
      var enc1, enc2, enc3, enc4;
      var i = 0;
  
      input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
  
      while (i < input.length) {
  
        enc1 = this._keyStr.indexOf(input.charAt(i++));
        enc2 = this._keyStr.indexOf(input.charAt(i++));
        enc3 = this._keyStr.indexOf(input.charAt(i++));
        enc4 = this._keyStr.indexOf(input.charAt(i++));
  
        chr1 = (enc1 << 2) | (enc2 >> 4);
        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
        chr3 = ((enc3 & 3) << 6) | enc4;
  
        output = output + String.fromCharCode(chr1);
  
        if (enc3 != 64) {
          output = output + String.fromCharCode(chr2);
        }
        if (enc4 != 64) {
          output = output + String.fromCharCode(chr3);
        }
  
      }
  
      output = Base64._utf8_decode(output);
  
      return output;
  
    },
  
    // private method for UTF-8 encoding
    _utf8_encode: function(string) {
      string = string.replace(/\r\n/g, "\n");
      var utftext = "";
  
      for (var n = 0; n < string.length; n++) {
  
        var c = string.charCodeAt(n);
  
        if (c < 128) {
          utftext += String.fromCharCode(c);
        } else if ((c > 127) && (c < 2048)) {
          utftext += String.fromCharCode((c >> 6) | 192);
          utftext += String.fromCharCode((c & 63) | 128);
        } else {
          utftext += String.fromCharCode((c >> 12) | 224);
          utftext += String.fromCharCode(((c >> 6) & 63) | 128);
          utftext += String.fromCharCode((c & 63) | 128);
        }
  
      }
  
      return utftext;
    },
  
    // private method for UTF-8 decoding
    _utf8_decode: function(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;
    }
  
  }
  
  chr = function(code) {
    return String.fromCharCode(code);
  };
  
  //returns utf8 encoded charachter of a unicode value.
  //code must be a number indicating the Unicode value.
  //returned value is a string between 1 and 4 charachters.
  code2utf = function(code) {
    if (code < 128) return chr(code);
    if (code < 2048) return chr(192 + (code >> 6)) + chr(128 + (code & 63));
    if (code < 65536) return chr(224 + (code >> 12)) + chr(128 + ((code >> 6) & 63)) + chr(128 + (code & 63));
    if (code < 2097152) return chr(240 + (code >> 18)) + chr(128 + ((code >> 12) & 63)) + chr(128 + ((code >> 6) & 63)) + chr(128 + (code & 63));
  };
  
  //it is a private function for internal use in utf8Encode function 
  _utf8Encode = function(str) {
    var utf8str = new Array();
    for (var i = 0; i < str.length; i++) {
      utf8str[i] = code2utf(str.charCodeAt(i));
    }
    return utf8str.join('');
  };
  
  //Encodes a unicode string to UTF8 format.
  utf8Encode = function(str) {
    var utf8str = new Array();
    var pos, j = 0;
    var tmpStr = '';
  
    while ((pos = str.search(/[^\x00-\x7F]/)) != -1) {
      tmpStr = str.match(/([^\x00-\x7F]+[\x00-\x7F]{0,10})+/)[0];
      utf8str[j++] = str.substr(0, pos);
      utf8str[j++] = _utf8Encode(tmpStr);
      str = str.substr(pos + tmpStr.length);
    }
  
    utf8str[j++] = str;
    return utf8str.join('');
  };
  
  // Contained bug: while loop exit prematurely creating incorrect encoding:
  // mystr=String.fromCharCode(3,0,0,0);
  // encodeBase64(mystr); // "Aw=="
  // btoa(mystr); // "AwAAAA=="
  function encodeBase64(str) {
    var chr1, chr2, chr3, rez = '',
        arr = [],
        i = 0,
        j = 0,
        code = 0;
    var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split('');
  
    for (j = 0; j < str.length; j++) {
      code = str.charCodeAt(j);
      if (code < 128) {
        arr[arr.length] = code;
      } else if (code < 2048) {
        arr[arr.length] = 192 | (code >> 6);
        arr[arr.length] = 128 | (code & 63);
      } else if (code < 65536) {
        arr[arr.length] = 224 | (code >> 12);
        arr[arr.length] = 128 | ((code >> 6) & 63);
        arr[arr.length] = 128 | (code & 63);
      } else {
        arr[arr.length] = 240 | (code >> 18);
        arr[arr.length] = 128 | ((code >> 12) & 63);
        arr[arr.length] = 128 | ((code >> 6) & 63);
        arr[arr.length] = 128 | (code & 63);
      }
    };
  
    while (i < arr.length) {
      chr1 = arr[i++];
      chr2 = arr[i++];
      chr3 = arr[i++];
  
      rez += chars[chr1 >> 2];
      rez += chars[((chr1 & 3) << 4) | (chr2 >> 4)];
      rez += chars[chr2 === undefined ? 64 : ((chr2 & 15) << 2) | (chr3 >> 6)];
      rez += chars[chr3 === undefined ? 64 : chr3 & 63];
    };
    return rez;
  };
  
  // based on Kevin van Zonneveld (http://kevin.vanzonneveld.net), original by Webtoolkit.info (http://www.webtoolkit.info/)
  // improved by: sowberry, Yves Sucaet, kirilloid
  // bugfixed by: Onno Marsman, Onno Marsman, Ulrich, Rafal Kukawski
  // tweaked by: Jack
  
  function utf8_encode(a) {
    var d = 0,
        b = 0,
        c = "",
        f, e;
    if (null === a || "undefined" === typeof a) {
      return ""
    }
    a += "";
    f = a.length;
    for (var g = 0; g < f; g++) {
      e = a.charCodeAt(g), crt_encode = null, 128 > e ? d++ : crt_encode = 127 < e && 2048 > e ? String.fromCharCode(e >> 6 | 192, e & 63 | 128) : String.fromCharCode(e >> 12 | 224, e >> 6 & 63 | 128, e & 63 | 128), null !== crt_encode && (d > b && (c += a.slice(b, d)), c += crt_encode, b = d = g + 1)
    }
    d > b && (c += a.slice(b, f));
    return c
  }
  // based on http://www.webtoolkit.info/
  
  function base64_encode(a) {
    var d = "",
        b, c, f, e, g, h, j = 0,
        k;
    a = utf8_encode(a);
    for (k = a.length; j < k;) {
      b = a.charCodeAt(j++), c = a.charCodeAt(j++), f = a.charCodeAt(j++), e = b >> 2, b = (b & 3) << 4 | c >> 4, g = (c & 15) << 2 | f >> 6, h = f & 63, isNaN(c) ? g = h = 64 : isNaN(f) && (h = 64), d += "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".charAt(e) + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".charAt(b) + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".charAt(g) + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".charAt(h)
    }
    return d
  }
  
  a = "";
  for (var i = 0; i < 100; i++)
  a += "teststring ";

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Native btoa function
b = btoa(a);
pending…
javascript btoa
b = Base64.encode(a);
pending…
native btoa with javscript utf-8 encode
b = btoa(Base64._utf8_encode(a));
pending…
native btoa with native utf-8 encoding
b = btoa(unescape(encodeURIComponent(a)));
pending…
native btoa with javascript utf-8 #2
b = btoa(utf8Encode(a));
pending…
Javascript btoa #2 (encodeBase64)
b = encodeBase64(a);
pending…
native btoa with javascript utf8_encode
b = btoa(utf8_encode(a));
pending…
base64_encode with javascript utf8_encode
b = base64_encode(utf8_encode(a));
pending…
$u.btoa
b = $u.btoa(a);
pending…
$u.btoa with $u.Utf8encode
b = $u.btoa($u.utf8Encode(a));
pending…
$u.btoa_shim
b = $u.btoa_shim(a);
pending…
$u.btoa_shim with $u.Utf8encode_shim
b = $u.btoa_shim($u.utf8Encode_shim(a));
pending…
$u.btoa with $u.Utf8encode_shim
b = $u.btoa($u.utf8Encode_shim(a));
pending…

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Revisions

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