The Tor Browser: addon-sdk/source/lib/sdk/base64.js@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 "use strict";

     7 module.metadata = {

     8   "stability": "unstable"

     9 };

    11 const { Cu } = require("chrome");

    13 // Passing an empty object as second argument to avoid scope's pollution

    14 const { atob, btoa } = Cu.import("resource://gre/modules/Services.jsm", {});

    16 function isUTF8(charset) {

    17   let type = typeof charset;

    19   if (type === "undefined")

    20     return false;

    22   if (type === "string" && charset.toLowerCase() === "utf-8")

    23     return true;

    25   throw new Error("The charset argument can be only 'utf-8'");

    26 }

    28 exports.decode = function (data, charset) {

    29   if (isUTF8(charset))

    30 		return decodeURIComponent(escape(atob(data)))

    32 	return atob(data);

    33 }

    35 exports.encode = function (data, charset) {

    36   if (isUTF8(charset))

    37     return btoa(unescape(encodeURIComponent(data)))

    39 	return btoa(data);

    40 }

The Tor Browser / file revision