The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 function run_test() {

   // setup a profile directory

   var dir = do_get_profile();

   // initialize the permission manager service

   var pm = Cc["@mozilla.org/permissionmanager;1"].

            getService(Ci.nsIPermissionManager);

   // get the db file

   var file = dir.clone();

   file.append("permissions.sqlite");

   do_check_true(file.exists());

   // corrupt the file

   var ostream = Cc["@mozilla.org/network/file-output-stream;1"].

                 createInstance(Ci.nsIFileOutputStream);

   ostream.init(file, 0x02, 0666, 0);

   var conv = Cc["@mozilla.org/intl/converter-output-stream;1"].

              createInstance(Ci.nsIConverterOutputStream);

   conv.init(ostream, "UTF-8", 0, 0);

   for (var i = 0; i < file.fileSize; ++i)

     conv.writeString("a");

   conv.close();

   // prepare an empty hostperm.1 file so that it can be used for importing

   var hostperm = dir.clone();

   hostperm.append("hostperm.1");

   ostream.init(hostperm, 0x02 | 0x08, 0666, 0);

   ostream.close();

   // remove all should not throw

   pm.removeAll();

 }