The Tor Browser / file revision

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

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

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

 Components.utils.import("resource://gre/modules/Services.jsm");

 this.EXPORTED_SYMBOLS = [

   "parseKeyValuePairs",

   "parseKeyValuePairsFromFile"

 ];

 const Cc = Components.classes;

 const Ci = Components.interfaces;

 this.parseKeyValuePairs = function parseKeyValuePairs(text) {

   let lines = text.split('\n');

   let data = {};

   for (let i = 0; i < lines.length; i++) {

     if (lines[i] == '')

       continue;

     // can't just .split() because the value might contain = characters

     let eq = lines[i].indexOf('=');

     if (eq != -1) {

       let [key, value] = [lines[i].substring(0, eq),

                           lines[i].substring(eq + 1)];

       if (key && value)

         data[key] = value.replace(/\\n/g, "\n").replace(/\\\\/g, "\\");

     }

   }

   return data;

 }

 this.parseKeyValuePairsFromFile = function parseKeyValuePairsFromFile(file) {

   let fstream = Cc["@mozilla.org/network/file-input-stream;1"].

                 createInstance(Ci.nsIFileInputStream);

   fstream.init(file, -1, 0, 0);

   let is = Cc["@mozilla.org/intl/converter-input-stream;1"].

            createInstance(Ci.nsIConverterInputStream);

   is.init(fstream, "UTF-8", 1024, Ci.nsIConverterInputStream.DEFAULT_REPLACEMENT_CHARACTER);

   let str = {};

   let contents = '';

   while (is.readString(4096, str) != 0) {

     contents += str.value;

   }

   is.close();

   fstream.close();

   return parseKeyValuePairs(contents);

 }