code: function(base64) {
        // Remove non-base-64 characters
        base64 = base64.replace(/[^A-Z0-9+\/]/ig, '');
  
        for (var bytes = [], i = 0, imod4 = 0; i < base64.length;
            imod4 = ++i % 4) {
          if (imod4 == 0) continue;
          bytes.push(((base64map.indexOf(base64.charAt(i - 1))
              & (Math.pow(2, -2 * imod4 + 8) - 1)) << (imod4 * 2))
              | (base64map.indexOf(base64.charAt(i)) >>> (6 - imod4 * 2)));
        }
        return bytes;
      }
docs: Convert a base-64 string to a byte array