The Tor Browser: accessible/src/atk/UtilInterface.cpp@97036ab72558 (annotated)

accessible/src/atk/UtilInterface.cpp@97036ab72558 (annotated)

accessible/src/atk/UtilInterface.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set ts=2 et sw=2 tw=80: */
 /* 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/. */
 #include "ApplicationAccessibleWrap.h"
 #include "mozilla/Likely.h"
 #include "nsAccessibilityService.h"
 #include "nsMai.h"
 #include <atk/atk.h>
 #include <gtk/gtk.h>
 #include <string.h>
 using namespace mozilla;
 using namespace mozilla::a11y;
 typedef AtkUtil MaiUtil;
 typedef AtkUtilClass MaiUtilClass;
 #define MAI_VERSION MOZILLA_VERSION
 #define MAI_NAME "Gecko"
 extern "C" {
 static guint (*gail_add_global_event_listener)(GSignalEmissionHook listener,
                                                const gchar* event_type);
 static void (*gail_remove_global_event_listener) (guint remove_listener);
 static void (*gail_remove_key_event_listener) (guint remove_listener);
 static AtkObject*  (*gail_get_root)();
 }
 struct MaiUtilListenerInfo
 {
   gint key;
   guint signal_id;
   gulong hook_id;
   // For window create/destory/minimize/maximize/restore/activate/deactivate
   // events, we'll chain gail_util's add/remove_global_event_listener.
   // So we store the listenerid returned by gail's add_global_event_listener
   // in this structure to call gail's remove_global_event_listener later.
   guint gail_listenerid;
 };
 static GHashTable* sListener_list = nullptr;
 static gint sListener_idx = 1;
 extern "C" {
 static guint
 add_listener (GSignalEmissionHook listener,
               const gchar *object_type,
               const gchar *signal,
               const gchar *hook_data,
               guint gail_listenerid = 0)
 {
     GType type;
     guint signal_id;
     gint rc = 0;
     type = g_type_from_name(object_type);
     if (type) {
         signal_id = g_signal_lookup(signal, type);
         if (signal_id > 0) {
             MaiUtilListenerInfo *listener_info;
             rc = sListener_idx;
             listener_info =  (MaiUtilListenerInfo *)
                 g_malloc(sizeof(MaiUtilListenerInfo));
             listener_info->key = sListener_idx;
             listener_info->hook_id =
                 g_signal_add_emission_hook(signal_id, 0, listener,
                                            g_strdup(hook_data),
                                            (GDestroyNotify)g_free);
             listener_info->signal_id = signal_id;
             listener_info->gail_listenerid = gail_listenerid;
             g_hash_table_insert(sListener_list, &(listener_info->key),
                                 listener_info);
             sListener_idx++;
         }
         else {
             g_warning("Invalid signal type %s\n", signal);
         }
     }
     else {
         g_warning("Invalid object type %s\n", object_type);
     }
     return rc;
 }
 static guint
 mai_util_add_global_event_listener(GSignalEmissionHook listener,
                                    const gchar *event_type)
 {
     guint rc = 0;
     gchar **split_string;
     split_string = g_strsplit (event_type, ":", 3);
     if (split_string) {
         if (!strcmp ("window", split_string[0])) {
             guint gail_listenerid = 0;
             if (gail_add_global_event_listener) {
                 // call gail's function to track gtk native window events
                 gail_listenerid =
                     gail_add_global_event_listener(listener, event_type);
             }
             rc = add_listener (listener, "MaiAtkObject", split_string[1],
                                event_type, gail_listenerid);
         }
         else {
             rc = add_listener (listener, split_string[1], split_string[2],
                                event_type);
         }
         g_strfreev(split_string);
     }
     return rc;
 }
 static void
 mai_util_remove_global_event_listener(guint remove_listener)
 {
     if (remove_listener > 0) {
         MaiUtilListenerInfo *listener_info;
         gint tmp_idx = remove_listener;
         listener_info = (MaiUtilListenerInfo *)
             g_hash_table_lookup(sListener_list, &tmp_idx);
         if (listener_info != nullptr) {
             if (gail_remove_global_event_listener &&
                 listener_info->gail_listenerid) {
               gail_remove_global_event_listener(listener_info->gail_listenerid);
             }
             /* Hook id of 0 and signal id of 0 are invalid */
             if (listener_info->hook_id != 0 && listener_info->signal_id != 0) {
                 /* Remove the emission hook */
                 g_signal_remove_emission_hook(listener_info->signal_id,
                                               listener_info->hook_id);
                 /* Remove the element from the hash */
                 g_hash_table_remove(sListener_list, &tmp_idx);
             }
             else {
                 g_warning("Invalid listener hook_id %ld or signal_id %d\n",
                           listener_info->hook_id, listener_info->signal_id);
             }
         }
         else {
             // atk-bridge is initialized with gail (e.g. yelp)
             // try gail_remove_global_event_listener
             if (gail_remove_global_event_listener) {
                 return gail_remove_global_event_listener(remove_listener);
             }
             g_warning("No listener with the specified listener id %d",
                       remove_listener);
         }
     }
     else {
         g_warning("Invalid listener_id %d", remove_listener);
     }
 }
 static AtkKeyEventStruct *
 atk_key_event_from_gdk_event_key (GdkEventKey *key)
 {
     AtkKeyEventStruct *event = g_new0(AtkKeyEventStruct, 1);
     switch (key->type) {
     case GDK_KEY_PRESS:
         event->type = ATK_KEY_EVENT_PRESS;
         break;
     case GDK_KEY_RELEASE:
         event->type = ATK_KEY_EVENT_RELEASE;
         break;
     default:
         g_assert_not_reached ();
         return nullptr;
     }
     event->state = key->state;
     event->keyval = key->keyval;
     event->length = key->length;
     if (key->string && key->string [0] &&
         (key->state & GDK_CONTROL_MASK ||
          g_unichar_isgraph (g_utf8_get_char (key->string)))) {
         event->string = key->string;
     }
     else if (key->type == GDK_KEY_PRESS ||
              key->type == GDK_KEY_RELEASE) {
         event->string = gdk_keyval_name (key->keyval);
     }
     event->keycode = key->hardware_keycode;
     event->timestamp = key->time;
     return event;
 }
 struct MaiKeyEventInfo
 {
     AtkKeyEventStruct *key_event;
     gpointer func_data;
 };
 union AtkKeySnoopFuncPointer
 {
     AtkKeySnoopFunc func_ptr;
     gpointer data;
 };
 static gboolean
 notify_hf(gpointer key, gpointer value, gpointer data)
 {
     MaiKeyEventInfo *info = (MaiKeyEventInfo *)data;
     AtkKeySnoopFuncPointer atkKeySnoop;
     atkKeySnoop.data = value;
     return (atkKeySnoop.func_ptr)(info->key_event, info->func_data) ? TRUE : FALSE;
 }
 static void
 insert_hf(gpointer key, gpointer value, gpointer data)
 {
     GHashTable *new_table = (GHashTable *) data;
     g_hash_table_insert (new_table, key, value);
 }
 static GHashTable* sKey_listener_list = nullptr;
 static gint
 mai_key_snooper(GtkWidget *the_widget, GdkEventKey *event, gpointer func_data)
 {
     /* notify each AtkKeySnoopFunc in turn... */
     MaiKeyEventInfo *info = g_new0(MaiKeyEventInfo, 1);
     gint consumed = 0;
     if (sKey_listener_list) {
         GHashTable *new_hash = g_hash_table_new(nullptr, nullptr);
         g_hash_table_foreach (sKey_listener_list, insert_hf, new_hash);
         info->key_event = atk_key_event_from_gdk_event_key (event);
         info->func_data = func_data;
         consumed = g_hash_table_foreach_steal (new_hash, notify_hf, info);
         g_hash_table_destroy (new_hash);
         g_free(info->key_event);
     }
     g_free(info);
     return (consumed ? 1 : 0);
 }
 static guint sKey_snooper_id = 0;
 static guint
 mai_util_add_key_event_listener (AtkKeySnoopFunc listener,
                                  gpointer data)
 {
   if (MOZ_UNLIKELY(!listener))
     return 0;
     static guint key=0;
     if (!sKey_listener_list) {
         sKey_listener_list = g_hash_table_new(nullptr, nullptr);
         sKey_snooper_id = gtk_key_snooper_install(mai_key_snooper, data);
     }
     AtkKeySnoopFuncPointer atkKeySnoop;
     atkKeySnoop.func_ptr = listener;
     g_hash_table_insert(sKey_listener_list, GUINT_TO_POINTER (key++),
                         atkKeySnoop.data);
     return key;
 }
 static void
 mai_util_remove_key_event_listener (guint remove_listener)
 {
     if (!sKey_listener_list) {
         // atk-bridge is initialized with gail (e.g. yelp)
         // try gail_remove_key_event_listener
         return gail_remove_key_event_listener(remove_listener);
     }
     g_hash_table_remove(sKey_listener_list, GUINT_TO_POINTER (remove_listener));
     if (g_hash_table_size(sKey_listener_list) == 0) {
         gtk_key_snooper_remove(sKey_snooper_id);
     }
 }
 static AtkObject*
 mai_util_get_root()
 {
   ApplicationAccessible* app = ApplicationAcc();
   if (app)
     return app->GetAtkObject();
   // We've shutdown, try to use gail instead
   // (to avoid assert in spi_atk_tidy_windows())
   // XXX tbsaunde then why didn't we replace the gail atk_util impl?
   if (gail_get_root)
     return gail_get_root();
   return nullptr;
 }
 static const gchar*
 mai_util_get_toolkit_name()
 {
     return MAI_NAME;
 }
 static const gchar*
 mai_util_get_toolkit_version()
 {
     return MAI_VERSION;
 }
 static void
 _listener_info_destroy(gpointer data)
 {
     g_free(data);
 }
 static void
 window_added (AtkObject *atk_obj,
               guint     index,
               AtkObject *child)
 {
   if (!IS_MAI_OBJECT(child))
       return;
   static guint id =  g_signal_lookup ("create", MAI_TYPE_ATK_OBJECT);
   g_signal_emit (child, id, 0);
 }
 static void
 window_removed (AtkObject *atk_obj,
                 guint     index,
                 AtkObject *child)
 {
   if (!IS_MAI_OBJECT(child))
       return;
   static guint id =  g_signal_lookup ("destroy", MAI_TYPE_ATK_OBJECT);
   g_signal_emit (child, id, 0);
 }
   static void
 UtilInterfaceInit(MaiUtilClass* klass)
 {
     AtkUtilClass *atk_class;
     gpointer data;
     data = g_type_class_peek(ATK_TYPE_UTIL);
     atk_class = ATK_UTIL_CLASS(data);
     // save gail function pointer
     gail_add_global_event_listener = atk_class->add_global_event_listener;
     gail_remove_global_event_listener = atk_class->remove_global_event_listener;
     gail_remove_key_event_listener = atk_class->remove_key_event_listener;
     gail_get_root = atk_class->get_root;
     atk_class->add_global_event_listener =
         mai_util_add_global_event_listener;
     atk_class->remove_global_event_listener =
         mai_util_remove_global_event_listener;
     atk_class->add_key_event_listener = mai_util_add_key_event_listener;
     atk_class->remove_key_event_listener = mai_util_remove_key_event_listener;
     atk_class->get_root = mai_util_get_root;
     atk_class->get_toolkit_name = mai_util_get_toolkit_name;
     atk_class->get_toolkit_version = mai_util_get_toolkit_version;
     sListener_list = g_hash_table_new_full(g_int_hash, g_int_equal, nullptr,
                                            _listener_info_destroy);
     // Keep track of added/removed windows.
     AtkObject *root = atk_get_root ();
     g_signal_connect (root, "children-changed::add", (GCallback) window_added, nullptr);
     g_signal_connect (root, "children-changed::remove", (GCallback) window_removed, nullptr);
 }
 }
 GType
 mai_util_get_type()
 {
     static GType type = 0;
     if (!type) {
         static const GTypeInfo tinfo = {
             sizeof(MaiUtilClass),
             (GBaseInitFunc) nullptr, /* base init */
             (GBaseFinalizeFunc) nullptr, /* base finalize */
             (GClassInitFunc) UtilInterfaceInit, /* class init */
             (GClassFinalizeFunc) nullptr, /* class finalize */
             nullptr, /* class data */
             sizeof(MaiUtil), /* instance size */
 , /* nb preallocs */
             (GInstanceInitFunc) nullptr, /* instance init */
             nullptr /* value table */
         };
         type = g_type_register_static(ATK_TYPE_UTIL,
                                       "MaiUtil", &tinfo, GTypeFlags(0));
     }
     return type;
 }

The Tor Browser / annotate

accessible/src/atk/UtilInterface.cpp@97036ab72558 (annotated)

accessible/src/atk/UtilInterface.cpp