pgweb/static/js/base64.js

/**
*
*  Base64 encode / decode
*  http://www.webtoolkit.info/
*
**/

 


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;


  }



}