michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: "use strict";
michael@0: 
michael@0: module.metadata = {
michael@0:   "stability": "unstable"
michael@0: };
michael@0: 
michael@0: const { Cu } = require("chrome");
michael@0: 
michael@0: // Passing an empty object as second argument to avoid scope's pollution
michael@0: const { atob, btoa } = Cu.import("resource://gre/modules/Services.jsm", {});
michael@0: 
michael@0: function isUTF8(charset) {
michael@0:   let type = typeof charset;
michael@0: 
michael@0:   if (type === "undefined")
michael@0:     return false;
michael@0: 
michael@0:   if (type === "string" && charset.toLowerCase() === "utf-8")
michael@0:     return true;
michael@0: 
michael@0:   throw new Error("The charset argument can be only 'utf-8'");
michael@0: }
michael@0: 
michael@0: exports.decode = function (data, charset) {
michael@0:   if (isUTF8(charset))
michael@0: 		return decodeURIComponent(escape(atob(data)))
michael@0: 
michael@0: 	return atob(data);
michael@0: }
michael@0: 
michael@0: exports.encode = function (data, charset) {
michael@0:   if (isUTF8(charset))
michael@0:     return btoa(unescape(encodeURIComponent(data)))
michael@0: 
michael@0: 	return btoa(data);
michael@0: }