Use FileSystem API to store data in Opera

lib/filesystem/io.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 32 matching lines @@
 
   lineBreak: "\n",
 
   resolveFilePath: function(path)
   {
     return new FakeFile(path);
   },
 
   readFromFile: function(file, decode, listener, callback, timeLineID)
   {
+    // Hack to allow importing old data
+    if (typeof file == "string")
+    {
+      var Utils = require("utils").Utils;
+      Utils.runAsync(function()
+      {
+        var lines = file.split(/[\r\n]+/);
+        for (var i = 0; i < lines.length; i++)
+          listener.process(lines[i]);
+        listener.process(null);
+        callback(null);
+      }.bind(this));
+      return;
+    }
+
     if ("spec" in file && /^defaults\b/.test(file.spec))
     {
       // Code attempts to read the default patterns.ini, we don't have that.
       // Make sure to execute first-run actions instead.
       if (localStorage.currentVersion)
         seenDataCorruption = true;
       delete localStorage.currentVersion;
       callback(null);
       return;
     }
@@ skipping 99 matching lines @@
     {
       fileEntry.remove(function()
       {
         callback(null);
       }, callback);
     }, callback);
   },
 
   statFile: function(file, callback)
   {
+    // Hack to allow importing old data
+    if (typeof file == "string")
+    {
+      var Utils = require("utils").Utils;
+      Utils.runAsync(callback.bind(null, null, {
+        exists: true,
+        isDirectory: false,
+        isFile: true,
+        lastModified: 0
+      }));
+      return;
+    }
+
     this._getFileEntry(file, false, function(fs, fileEntry)
     {
       fileEntry.getMetadata(function(metadata)
       {
         callback(null, {
           exists: true,
           isDirectory: fileEntry.isDirectory,
           isFile: fileEntry.isFile,
           lastModified: metadata.modificationTime.getTime()
         });
       }, callback);
     }, callback);
   }
 };