// 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

var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

function encode64(input) {
   var output = "";
   var chr1, chr2, chr3;
   var enc1, enc2, enc3, enc4;
   var i = 0;

   do {
	  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 + keyStr.charAt(enc1) + keyStr.charAt(enc2) +
		 keyStr.charAt(enc3) + keyStr.charAt(enc4);
   } while (i < input.length);

   return output;
}

function decode64(input) {
   var output = "";
   var chr1, chr2, chr3;
   var enc1, enc2, enc3, enc4;
   var i = 0;

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

   do {
	  enc1 = keyStr.indexOf(input.charAt(i++));
	  enc2 = keyStr.indexOf(input.charAt(i++));
	  enc3 = keyStr.indexOf(input.charAt(i++));
	  enc4 = 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);
	  }
   } while (i < input.length);

   return output;
}