text: // Base64 JavaScript decoder
  // Copyright (c) 2008-2020 Lapo Luchini <lapo@lapo.it>
  
  // Permission to use, copy, modify, and/or distribute this software for any
  // purpose with or without fee is hereby granted, provided that the above
  // copyright notice and this permission notice appear in all copies.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  
  (typeof define != 'undefined' ? define : function (factory) { 'use strict';
      if (typeof module == 'object') module.exports = factory();
      else window.base64 = factory();
  })(function () {
  "use strict";
  
  var Base64 = {},
      decoder, // populated on first usage
      haveU8 = (typeof Uint8Array == 'function');
  
  Base64.decode = function (a) {
      var isString = (typeof a == 'string');
      var i;
      if (decoder === undefined) {
          var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
              ignore = "= \f\n\r\t\u00A0\u2028\u2029";
          decoder = [];
          for (i = 0; i < 64; ++i)
              decoder[b64.charCodeAt(i)] = i;
          for (i = 0; i < ignore.length; ++i)
              decoder[ignore.charCodeAt(i)] = -1;
          // RFC 3548 URL & file safe encoding
          decoder['-'.charCodeAt(0)] = decoder['+'.charCodeAt(0)];
          decoder['_'.charCodeAt(0)] = decoder['/'.charCodeAt(0)];
      }
      var out = haveU8 ? new Uint8Array(a.length * 3 >> 2) : [];
      var bits = 0, char_count = 0, len = 0;
      for (i = 0; i < a.length; ++i) {
          var c = isString ? a.charCodeAt(i) : a[i];
          if (c == 61) // '='.charCodeAt(0)
              break;
          c = decoder[c];
          if (c == -1)
              continue;
          if (c === undefined)
              throw 'Illegal character at offset ' + i;
          bits |= c;
          if (++char_count >= 4) {
              out[len++] = (bits >> 16);
              out[len++] = (bits >> 8) & 0xFF;
              out[len++] = bits & 0xFF;
              bits = 0;
              char_count = 0;
          } else {
              bits <<= 6;
          }
      }
      switch (char_count) {
      case 1:
          throw "Base64 encoding incomplete: at least 2 bits missing";
      case 2:
          out[len++] = (bits >> 10);
          break;
      case 3:
          out[len++] = (bits >> 16);
          out[len++] = (bits >> 8) & 0xFF;
          break;
      }
      if (haveU8 && out.length > len) // in case it was originally longer because of ignored characters
          out = out.subarray(0, len);
      return out;
  };
  
  Base64.pretty = function (str) {
      // fix padding
      if (str.length % 4 > 0)
          str = (str + '===').slice(0, str.length + str.length % 4);
      // convert RFC 3548 to standard Base64
      str = str.replace(/-/g, '+').replace(/_/g, '/');
      // 80 column width
      return str.replace(/(.{80})/g, '$1\n');
  };
  
  Base64.re = /-----BEGIN [^-]+-----([A-Za-z0-9+/=\s]+)-----END [^-]+-----|begin-base64[^\n]+\n([A-Za-z0-9+/=\s]+)====/;
  Base64.unarmor = function (a) {
      var m = Base64.re.exec(a);
      if (m) {
          if (m[1])
              a = m[1];
          else if (m[2])
              a = m[2];
          else
              throw "RegExp out of sync";
      }
      return Base64.decode(a);
  };
  Base64.encode=function( buffer ) {
            var binary = '';
            var bytes = new Uint8Array( buffer );
            var len = bytes.byteLength;
            for (var i = 0; i < len; i++) {
                binary += String.fromCharCode( bytes[ i ] );
            }
            return window.btoa( binary );
  }
  return Base64;
  
  });
  