/*
 *  base64.js
 *
 *  Licensed under the BSD 3-Clause License.
 *    http://opensource.org/licenses/BSD-3-Clause
 *
 *  References:
 *    http://en.wikipedia.org/wiki/Base64
 */
;(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined'
      ? module.exports = factory(global)
      : typeof define === 'function' && define.amd
      ? define(factory) : factory(global)
}((
  typeof self !== 'undefined' ? self
      : typeof window !== 'undefined' ? window
      : typeof global !== 'undefined' ? global
: this
), function(global) {
  'use strict';
  // existing version for noConflict()
  var _Base64 = global.Base64;
  var version = "2.5.0";
  // if node.js and NOT React Native, we use Buffer
  var buffer;
  if (typeof module !== 'undefined' && module.exports) {
      try {
          buffer = eval("require('buffer').Buffer");
      } catch (err) {
          buffer = undefined;
      }
  }
  // constants
  var b64chars
      = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  var b64tab = function(bin) {
      var t = {};
      for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;
      return t;
  }(b64chars);
  var fromCharCode = String.fromCharCode;
  // encoder stuff
  var cb_utob = function(c) {
      if (c.length < 2) {
          var cc = c.charCodeAt(0);
          return cc < 0x80 ? c
              : cc < 0x800 ? (fromCharCode(0xc0 | (cc >>> 6))
                              + fromCharCode(0x80 | (cc & 0x3f)))
              : (fromCharCode(0xe0 | ((cc >>> 12) & 0x0f))
                 + fromCharCode(0x80 | ((cc >>>  6) & 0x3f))
                 + fromCharCode(0x80 | ( cc         & 0x3f)));
      } else {
          var cc = 0x10000
              + (c.charCodeAt(0) - 0xD800) * 0x400
              + (c.charCodeAt(1) - 0xDC00);
          return (fromCharCode(0xf0 | ((cc >>> 18) & 0x07))
                  + fromCharCode(0x80 | ((cc >>> 12) & 0x3f))
                  + fromCharCode(0x80 | ((cc >>>  6) & 0x3f))
                  + fromCharCode(0x80 | ( cc         & 0x3f)));
      }
  };
  var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
  var utob = function(u) {
      return u.replace(re_utob, cb_utob);
  };
  var cb_encode = function(ccc) {
      var padlen = [0, 2, 1][ccc.length % 3],
      ord = ccc.charCodeAt(0) << 16
          | ((ccc.length > 1 ? ccc.charCodeAt(1) : 0) << 8)
          | ((ccc.length > 2 ? ccc.charCodeAt(2) : 0)),
      chars = [
          b64chars.charAt( ord >>> 18),
          b64chars.charAt((ord >>> 12) & 63),
          padlen >= 2 ? '=' : b64chars.charAt((ord >>> 6) & 63),
          padlen >= 1 ? '=' : b64chars.charAt(ord & 63)
      ];
      return chars.join('');
  };
  var btoa = global.btoa ? function(b) {
      return global.btoa(b);
  } : function(b) {
      return b.replace(/[\s\S]{1,3}/g, cb_encode);
  };
  var _encode = buffer ?
      buffer.from && Uint8Array && buffer.from !== Uint8Array.from
      ? function (u) {
          return (u.constructor === buffer.constructor ? u : buffer.from(u))
              .toString('base64')
      }
      :  function (u) {
          return (u.constructor === buffer.constructor ? u : new  buffer(u))
              .toString('base64')
      }
      : function (u) { return btoa(utob(u)) }
  ;
  var encode = function(u, urisafe) {
      return !urisafe
          ? _encode(String(u))
          : _encode(String(u)).replace(/[+\/]/g, function(m0) {
              return m0 == '+' ? '-' : '_';
          }).replace(/=/g, '');
  };
  var encodeURI = function(u) { return encode(u, true) };
  // decoder stuff
  var re_btou = new RegExp([
      '[\xC0-\xDF][\x80-\xBF]',
      '[\xE0-\xEF][\x80-\xBF]{2}',
      '[\xF0-\xF7][\x80-\xBF]{3}'
  ].join('|'), 'g');
  var cb_btou = function(cccc) {
      switch(cccc.length) {
      case 4:
          var cp = ((0x07 & cccc.charCodeAt(0)) << 18)
              |    ((0x3f & cccc.charCodeAt(1)) << 12)
              |    ((0x3f & cccc.charCodeAt(2)) <<  6)
              |     (0x3f & cccc.charCodeAt(3)),
          offset = cp - 0x10000;
          return (fromCharCode((offset  >>> 10) + 0xD800)
                  + fromCharCode((offset & 0x3FF) + 0xDC00));
      case 3:
          return fromCharCode(
              ((0x0f & cccc.charCodeAt(0)) << 12)
                  | ((0x3f & cccc.charCodeAt(1)) << 6)
                  |  (0x3f & cccc.charCodeAt(2))
          );
      default:
          return  fromCharCode(
              ((0x1f & cccc.charCodeAt(0)) << 6)
                  |  (0x3f & cccc.charCodeAt(1))
          );
      }
  };
  var btou = function(b) {
      return b.replace(re_btou, cb_btou);
  };
  var cb_decode = function(cccc) {
      var len = cccc.length,
      padlen = len % 4,
      n = (len > 0 ? b64tab[cccc.charAt(0)] << 18 : 0)
          | (len > 1 ? b64tab[cccc.charAt(1)] << 12 : 0)
          | (len > 2 ? b64tab[cccc.charAt(2)] <<  6 : 0)
          | (len > 3 ? b64tab[cccc.charAt(3)]       : 0),
      chars = [
          fromCharCode( n >>> 16),
          fromCharCode((n >>>  8) & 0xff),
          fromCharCode( n         & 0xff)
      ];
      chars.length -= [0, 0, 2, 1][padlen];
      return chars.join('');
  };
  var _atob = global.atob ? function(a) {
      return global.atob(a);
  } : function(a){
      return a.replace(/\S{1,4}/g, cb_decode);
  };
  var atob = function(a) {
      return _atob(String(a).replace(/[^A-Za-z0-9\+\/]/g, ''));
  };
  var _decode = buffer ?
      buffer.from && Uint8Array && buffer.from !== Uint8Array.from
      ? function(a) {
          return (a.constructor === buffer.constructor
                  ? a : buffer.from(a, 'base64')).toString();
      }
      : function(a) {
          return (a.constructor === buffer.constructor
                  ? a : new buffer(a, 'base64')).toString();
      }
      : function(a) { return btou(_atob(a)) };
  var decode = function(a){
      return _decode(
          String(a).replace(/[-_]/g, function(m0) { return m0 == '-' ? '+' : '/' })
              .replace(/[^A-Za-z0-9\+\/]/g, '')
      );
  };
  var noConflict = function() {
      var Base64 = global.Base64;
      global.Base64 = _Base64;
      return Base64;
  };
  // export Base64
  global.Base64 = {
      VERSION: version,
      atob: atob,
      btoa: btoa,
      fromBase64: decode,
      toBase64: encode,
      utob: utob,
      encode: encode,
      encodeURI: encodeURI,
      btou: btou,
      decode: decode,
      noConflict: noConflict,
      __buffer__: buffer
  };
  // if ES5 is available, make Base64.extendString() available
  if (typeof Object.defineProperty === 'function') {
      var noEnum = function(v){
          return {value:v,enumerable:false,writable:true,configurable:true};
      };
      global.Base64.extendString = function () {
          Object.defineProperty(
              String.prototype, 'fromBase64', noEnum(function () {
                  return decode(this)
              }));
          Object.defineProperty(
              String.prototype, 'toBase64', noEnum(function (urisafe) {
                  return encode(this, urisafe)
              }));
          Object.defineProperty(
              String.prototype, 'toBase64URI', noEnum(function () {
                  return encode(this, true)
              }));
      };
  }
  //
  // export Base64 to the namespace
  //
  if (global['Meteor']) { // Meteor.js
      Base64 = global.Base64;
  }
  // module.exports and AMD are mutually exclusive.
  // module.exports has precedence.
  if (typeof module !== 'undefined' && module.exports) {
      module.exports.Base64 = global.Base64;
  }
  else if (typeof define === 'function' && define.amd) {
      // AMD. Register as an anonymous module.
      define([], function(){ return global.Base64 });
  }
  // that's it!
  return {Base64: global.Base64}
}));
