Base64 hybrid method (v3)

Revision 3 of this benchmark created by Joel Hillacre on


Preparation HTML

<script>
  var txt = "You might assume from this that I couldn't give a rat's ass about these miserably inept crapmobile makers down the road in Detroit city. But I do care. I care about the millions whose lives and livelihoods depend on these car companies. I care about the security and defense of this country because the world is running out of oil -- and when it runs out, the calamity and collapse that will take place will make the current recession/depression look like a Tommy Tune musical.";
  
  function hybrid_encode(txt) {
    if (typeof(btoa) === 'function') {
      return btoa(txt);
    } else {
      return Base64.encode(txt);
    }
  }
  function hybrid_encode_prop(txt) {
    if ('btoa' in window) {
      return btoa(txt);
    } else {
      return Base64.encode(txt);
    }
  }
  if (window.btoa) {
    hybrid_encode_less_ifs = btoa;
  } else {
    hybrid_encode_less_ifs = function (txt) {
      return Base64.encode(txt);
    };
  }

  var 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;
    }
  
  }
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
Javascript encode
var out = Base64.encode(txt);
ready
Native btoa
var out = btoa(txt);
ready
Hyrbid of both
var out = hybrid_encode(txt);
ready
fallback if ObjNotFound
var out = hybrid_encode_prop(txt);
ready
less ifs
var out = hybrid_encode_less_ifs(txt);
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

  • Revision 1: published by Scott Baker on
  • Revision 2: published on
  • Revision 3: published by Joel Hillacre on
  • Revision 4: published by Xotic750 on
  • Revision 5: published by Xotic750 on
  • Revision 6: published by Xotic750 on
  • Revision 7: published by Xotic750 on