Use FileSystem API to store data in Opera

lib/localstorage/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
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-//
-// No direct file system access, using LocalStorage API
-//
-
-var IO = exports.IO =
-{
-  _getFilePath: function(file)
-  {
-    if (file instanceof FakeFile)
-      return file.path;
-    else if ("spec" in file)
-      return file.spec;
-
-    throw new Error("Unexpected file type");
-  },
-
-  _setFileContents: function(path, contents, lastModified)
-  {
-    window.localStorage[path] = contents;
-    window.localStorage[path + "/lastModified"] = lastModified || 0;
-  },
-
-  lineBreak: "\n",
-
-  resolveFilePath: function(path)
-  {
-    return new FakeFile(path);
-  },
-
-  readFromFile: function(file, decode, listener, callback, timeLineID)
-  {
-    var Utils = require("utils").Utils;
-    Utils.runAsync(function()
-    {
-      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;
-      }
-
-      var path = this._getFilePath(file);
-      if (!(path in window.localStorage))
-      {
-        callback(new Error("File doesn't exist"))
-        return;
-      }
-
-      var lines = window.localStorage[path].split(/[\r\n]+/);
-      for (var i = 0; i < lines.length; i++)
-        listener.process(lines[i]);
-      listener.process(null);
-      callback(null);
-    }.bind(this));
-  },
-
-  writeToFile: function(file, encode, data, callback, timeLineID)
-  {
-    var path = this._getFilePath(file);
-    this._setFileContents(path, data.join(this.lineBreak) + this.lineBreak, Date.now());
-
-    var Utils = require("utils").Utils;
-    Utils.runAsync(callback, null, null);
-  },
-
-  copyFile: function(fromFile, toFile, callback)
-  {
-    // Simply combine read and write operations
-    var data = [];
-    this.readFromFile(fromFile, false, {
-      process: function(line)
-      {
-        if (line !== null)
-          data.push(line);
-      }
-    }, function(e)
-    {
-      if (e)
-        callback(e);
-      else
-        this.writeToFile(toFile, false, data, callback);
-    }.bind(this));
-  },
-
-  renameFile: function(fromFile, newName, callback)
-  {
-    var path = this._getFilePath(fromFile);
-    if (!(path in window.localStorage))
-    {
-      callback(new Error("File doesn't exist"))
-      return;
-    }
-
-    this._setFileContents(newName, window.localStorage[path], window.localStorage[path + "/lastModified"]);
-    this.removeFile(fromFile, callback);
-  },
-
-  removeFile: function(file, callback)
-  {
-    var path = this._getFilePath(file);
-    delete window.localStorage[path];
-    delete window.localStorage[path + "/lastModified"];
-    callback(null);
-  },
-
-  statFile: function(file, callback)
-  {
-    var path = this._getFilePath(file);
-    callback(null, {
-      exists: path in window.localStorage,
-      isDirectory: false,
-      isFile: true,
-      lastModified: parseInt(window.localStorage[path + "/lastModified"], 10) || 0
-    });
-  }
-};