48 lines
1.2 KiB
JavaScript
48 lines
1.2 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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module.metadata = {
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"stability": "unstable"
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};
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const { Cu } = require("chrome");
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// Passing an empty object as second argument to avoid scope's pollution
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// (devtools loader injects these symbols as global and prevent using
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// const here)
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var { atob, btoa } = Cu.import("resource://gre/modules/Services.jsm", {});
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function isUTF8(charset) {
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let type = typeof charset;
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if (type === "undefined")
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return false;
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if (type === "string" && charset.toLowerCase() === "utf-8")
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return true;
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throw new Error("The charset argument can be only 'utf-8'");
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}
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function toOctetChar(c) {
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return String.fromCharCode(c.charCodeAt(0) & 0xFF);
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}
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exports.decode = function (data, charset) {
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if (isUTF8(charset))
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return decodeURIComponent(escape(atob(data)))
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return atob(data);
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}
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exports.encode = function (data, charset) {
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if (isUTF8(charset))
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return btoa(unescape(encodeURIComponent(data)))
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data = data.replace(/[^\x00-\xFF]/g, toOctetChar);
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return btoa(data);
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}
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