text: // Copyright unknown
  
  // A Base64 encoding library
  
  /* global module */
  var exports = module.exports = {};
  
  var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
  
  function utf8_encode (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;
  }
  
  exports.encode = function (input) {
    var output = "";
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;
  
    input = 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 + keyStr.charAt(enc1) + keyStr.charAt(enc2) + keyStr.charAt(enc3) + keyStr.charAt(enc4);
  
    }
  
    return output;
  };
  
  exports.decode = function (str_data) {
    var tmp_arr = [],
      i = 0,
      ac = 0,
      c1 = 0,
      c2 = 0,
      c3 = 0,
      c4 = 0;
  
    str_data += '';
  
    while (i < str_data.length) {
      c1 = str_data.charCodeAt(i);
      if (c1 <= 191) {
        tmp_arr[ac++] = String.fromCharCode(c1);
        i++;
      } else if (c1 <= 223) {
        c2 = str_data.charCodeAt(i + 1);
        tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
        i += 2;
      } else if (c1 <= 239) {
        // http://en.wikipedia.org/wiki/UTF-8#Codepage_layout
        c2 = str_data.charCodeAt(i + 1);
        c3 = str_data.charCodeAt(i + 2);
        tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
        i += 3;
      } else {
        c2 = str_data.charCodeAt(i + 1);
        c3 = str_data.charCodeAt(i + 2);
        c4 = str_data.charCodeAt(i + 3);
        c1 = ((c1 & 7) << 18) | ((c2 & 63) << 12) | ((c3 & 63) << 6) | (c4 & 63);
        c1 -= 0x10000;
        tmp_arr[ac++] = String.fromCharCode(0xD800 | ((c1 >> 10) & 0x3FF));
        tmp_arr[ac++] = String.fromCharCode(0xDC00 | (c1 & 0x3FF));
        i += 4;
      }
    }
  
    return tmp_arr.join('');
  }
  