btoa vs third party base64 encoder

JavaScript performance comparison

Revision 2 of this test case created by MRis

Preparation code


      
      <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('');
  };
  
  function encodeBase64(str){
  	var chr1, chr2, chr3, rez = '', arr = [], i = 0, j = 0, code = 0;
  	var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split('');
  
  	while(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;
  };
  
  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…

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Revisions

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