base64-str.js

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

(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;
})();