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3rdparty/pdf.js/extensions/firefox/chrome/content.js

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+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/* Copyright 2014 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/* jshint esnext:true */
+/* globals Components, Services, XPCOMUtils, PdfjsContentUtils,
+           PdfjsContentUtils, PdfStreamConverter, addMessageListener */
+
+'use strict';
+
+(function contentScriptClosure() {
+  // we need to use closure here -- we are running in the global context
+
+  const Cc = Components.classes;
+  const Ci = Components.interfaces;
+  const Cm = Components.manager;
+  const Cu = Components.utils;
+  const Cr = Components.results;
+
+  Cu.import('resource://gre/modules/XPCOMUtils.jsm');
+  Cu.import('resource://gre/modules/Services.jsm');
+
+  var isRemote = Services.appinfo.processType ===
+    Services.appinfo.PROCESS_TYPE_CONTENT;
+
+// Factory that registers/unregisters a constructor as a component.
+  function Factory() {
+  }
+
+  Factory.prototype = {
+    QueryInterface: XPCOMUtils.generateQI([Ci.nsIFactory]),
+    _targetConstructor: null,
+
+    register: function register(targetConstructor) {
+      this._targetConstructor = targetConstructor;
+      var proto = targetConstructor.prototype;
+      var registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
+      registrar.registerFactory(proto.classID, proto.classDescription,
+        proto.contractID, this);
+    },
+
+    unregister: function unregister() {
+      var proto = this._targetConstructor.prototype;
+      var registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
+      registrar.unregisterFactory(proto.classID, this);
+      this._targetConstructor = null;
+    },
+
+    // nsIFactory
+    createInstance: function createInstance(aOuter, iid) {
+      if (aOuter !== null) {
+        throw Cr.NS_ERROR_NO_AGGREGATION;
+      }
+      return (new (this._targetConstructor)()).QueryInterface(iid);
+    },
+
+    // nsIFactory
+    lockFactory: function lockFactory(lock) {
+      // No longer used as of gecko 1.7.
+      throw Cr.NS_ERROR_NOT_IMPLEMENTED;
+    }
+  };
+
+  var pdfStreamConverterFactory = new Factory();
+
+  function startup() {
+    Cu.import('resource://pdf.js/PdfjsContentUtils.jsm');
+    PdfjsContentUtils.init();
+
+    Cu.import('resource://pdf.js/PdfStreamConverter.jsm');
+    pdfStreamConverterFactory.register(PdfStreamConverter);
+  }
+
+  function shutdown() {
+    // Remove the contract/component.
+    pdfStreamConverterFactory.unregister();
+    // Unload the converter
+    Cu.unload('resource://pdf.js/PdfStreamConverter.jsm');
+
+    PdfjsContentUtils.uninit();
+    Cu.unload('resource://pdf.js/PdfjsContentUtils.jsm');
+  }
+
+  if (isRemote) {
+    startup();
+
+    addMessageListener('PDFJS:Child:shutdown', function (e) {
+      shutdown();
+    });
+  }
+})();