// This code was written by Tyler Akins and has been placed in the
// public domain.  It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com


function encode64(b64input) {

   var swapCodes   = new Array(8211, 8212, 8216, 8217, 8220, 8221, 8226, 8230);
   var swapStrings = new Array("-", "-", "'",  "'",  '"',  '"',  "*",  "...");
   
   for(charId = 0; charId < swapCodes.length; charId++)
   {
      b64input = b64input.replace(eval("/" + String.fromCharCode(swapCodes[charId]) + "/g"), swapStrings[charId]);
   }

   var b64keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
   
   var b64output = "";
   var b64chr1, b64chr2, b64chr3;
   var b64enc1, b64enc2, b64enc3, b64enc4;
   var b64i = 0;

   do {
      b64chr1 = b64input.charCodeAt(b64i++);
      b64chr2 = b64input.charCodeAt(b64i++);
      b64chr3 = b64input.charCodeAt(b64i++);

      b64enc1 = b64chr1 >> 2;
      b64enc2 = ((b64chr1 & 3) << 4) | (b64chr2 >> 4);
      b64enc3 = ((b64chr2 & 15) << 2) | (b64chr3 >> 6);
      b64enc4 = b64chr3 & 63;

      if (isNaN(b64chr2)) {
         b64enc3 = b64enc4 = 64;
      } else if (isNaN(b64chr3)) {
         b64enc4 = 64;
      }

      b64output = b64output + b64keyStr.charAt(b64enc1) + b64keyStr.charAt(b64enc2) + 
         b64keyStr.charAt(b64enc3) + b64keyStr.charAt(b64enc4);
   } while (b64i < b64input.length);
   
   return b64output;
}

function decode64(b64input) {
   var b64keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
   var b64output = "";
   var b64chr1, b64chr2, b64chr3;
   var b64enc1, enc2, b64enc3, b64enc4;
   var b64i = 0;

   // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
   b64input = b64input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

   do {
      b64enc1 = b64keyStr.indexOf(b64input.charAt(b64i++));
      b64enc2 = b64keyStr.indexOf(b64input.charAt(b64i++));
      b64enc3 = b64keyStr.indexOf(b64input.charAt(b64i++));
      b64enc4 = b64keyStr.indexOf(b64input.charAt(b64i++));

      b64chr1 = (b64enc1 << 2) | (b64enc2 >> 4);
      b64chr2 = ((b64enc2 & 15) << 4) | (b64enc3 >> 2);
      b64chr3 = ((b64enc3 & 3) << 6) | b64enc4;

      b64output = b64output + String.fromCharCode(b64chr1);

      if (b64enc3 != 64) {
         b64output = b64output + String.fromCharCode(b64chr2);
      }
      if (b64enc4 != 64) {
         b64output = b64output + String.fromCharCode(b64chr3);
      }
   } while (b64i < b64input.length);

   return b64output;
}