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/. */

 var EXPORTED_SYMBOLS = ['listDirectory', 'getFileForPath', 'abspath', 'getPlatform'];

 const Cc = Components.classes;

 const Ci = Components.interfaces;

 const Cu = Components.utils;

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

 function listDirectory(file) {

   // file is the given directory (nsIFile)

   var entries = file.directoryEntries;

   var array = [];

   while (entries.hasMoreElements()) {

     var entry = entries.getNext();

     entry.QueryInterface(Ci.nsIFile);

     array.push(entry);

   }

   return array;

 }

 function getFileForPath(path) {

   var file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile);

   file.initWithPath(path);

   return file;

 }

 function abspath(rel, file) {

   var relSplit = rel.split('/');

   if (relSplit[0] == '..' && !file.isDirectory()) {

     file = file.parent;

   }

   for each(var p in relSplit) {

     if (p == '..') {

       file = file.parent;

     } else if (p == '.') {

       if (!file.isDirectory()) {

         file = file.parent;

       }

     } else {

       file.append(p);

     }

   }

   return file.path;

 }

 function getPlatform() {

   return Services.appinfo.OS.toLowerCase();

 }