base64-str.js

/**
 * @providesModule base64-js
 * @noflow
 *
 * Original Source: https://gist.github.com/ncerminara/11257943
 */
'use strict';

(function () {
  var Base64Str = {
    _keyStr: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',
    encode: function(e: string) {
      var t = '';
      var n, r, i, s, o, u, a;
      var f = 0;
      e = Base64Str._utf8_encode(e);
      while (f < e.length) {
        n = e.charCodeAt(f++);
        r = e.charCodeAt(f++);
        i = e.charCodeAt(f++);
        s = n >> 2;
        o = (n & 3) << 4 | r >> 4;
        u = (r & 15) << 2 | i >> 6;
        a = i & 63;
        if (isNaN(r)) {
          u = a = 64;
        } else if (isNaN(i)) {
          a = 64;
        }
        t = t + this._keyStr.charAt(s) + this._keyStr.charAt(o) + this._keyStr
          .charAt(u) + this._keyStr.charAt(a);
      }
      return t;
    },
    decode: function(e: string) {
      var t = '';
      var n, r, i;
      var s, o, u, a;
      var f = 0;
      e = e.replace(/[^A-Za-z0-9\+\/\=]/g, '');
      while (f < e.length) {
        s = this._keyStr.indexOf(e.charAt(f++));
        o = this._keyStr.indexOf(e.charAt(f++));
        u = this._keyStr.indexOf(e.charAt(f++));
        a = this._keyStr.indexOf(e.charAt(f++));
        n = s << 2 | o >> 4;
        r = (o & 15) << 4 | u >> 2;
        i = (u & 3) << 6 | a;
        t = t + String.fromCharCode(n);
        if (u !== 64) {
          t = t + String.fromCharCode(r);
        }
        if (a !== 64) {
          t = t + String.fromCharCode(i);
        }
      }
      t = Base64Str._utf8_decode(t);
      return t;
    },
    _utf8_encode: function(e) {
      e = e.replace(/\r\n/g, '\n');
      var t = '';
      for (var n = 0; n < e.length; n++) {
        var r = e.charCodeAt(n);
        if (r < 128) {
          t += String.fromCharCode(r);
        } else if (r > 127 && r < 2048) {
          t += String.fromCharCode(r >> 6 | 192);
          t += String.fromCharCode(r & 63 | 128);
        } else {
          t += String.fromCharCode(r >> 12 | 224);
          t += String.fromCharCode(r >> 6 & 63 | 128);
          t += String.fromCharCode(r & 63 | 128);
        }
      }
      return t;
    },
    _utf8_decode: function(e) {
      var t = '';
      var n = 0;
      var r = 0, /*c1 = 0, */c2 = 0;
      while (n < e.length) {
        r = e.charCodeAt(n);
        if (r < 128) {
          t += String.fromCharCode(r);
          n++;
        } else if (r > 191 && r < 224) {
          c2 = e.charCodeAt(n + 1);
          t += String.fromCharCode((r & 31) << 6 | c2 & 63);
          n += 2;
        } else {
          c2 = e.charCodeAt(n + 1);
          var c3 = e.charCodeAt(n + 2);
          t += String.fromCharCode((r & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
          n += 3;
        }
      }
      return t;
    }
  };

  module.exports = Base64Str;
}());