code: function(input) {
  			var output = [];
  			var chr1, chr2, chr3, enc1, enc2, enc3, enc4, cdp1, cdp2, cdp3;
  			var i = 0, il = input.length, b64 = chars;
  
  			while (i < il) {
  
  				cdp1 = input.charCodeAt(i++);
  				cdp2 = input.charCodeAt(i++);
  				cdp3 = input.charCodeAt(i++);
  
  				chr1 = cdp1 & 0xff;
  				chr2 = cdp2 & 0xff;
  				chr3 = cdp3 & 0xff;
  
  				enc1 = chr1 >> 2;
  				enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
  				enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
  				enc4 = chr3 & 63;
  
  				if (isNaN(cdp2)) {
  					enc3 = enc4 = 64;
  				} else if (isNaN(cdp3)) {
  					enc4 = 64;
  				}
  
  				output.push(b64.charAt(enc1) + b64.charAt(enc2) + b64.charAt(enc3) + b64.charAt(enc4));
  			}
  
  			return output.join('');
  		}
docs: Encodes data using base64 algorithm
  @author Tyler Akins (http://rumkin.com)
  @param {String} input
  @returns {String}
  @memberOf emmet.base64