ppapi/proxy/plugin_message_filter.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ppapi/proxy/plugin_message_filter.h"
   6
   7 #include "ppapi/proxy/ppapi_messages.h"
   8
   9 namespace ppapi {
  10 namespace proxy {
  11
  12 PluginMessageFilter::PluginMessageFilter(
  13     std::set<PP_Instance>* seen_instance_ids)
  14     : seen_instance_ids_(seen_instance_ids),
  15       channel_(NULL) {
  16 }
  17
  18 PluginMessageFilter::~PluginMessageFilter() {
  19 }
  20
  21 void PluginMessageFilter::OnFilterAdded(IPC::Channel* channel) {
  22   channel_ = channel;
  23 }
  24
  25 void PluginMessageFilter::OnFilterRemoved() {
  26   channel_ = NULL;
  27 }
  28
  29 bool PluginMessageFilter::OnMessageReceived(const IPC::Message& message) {
  30   bool handled = true;
  31   IPC_BEGIN_MESSAGE_MAP(PluginMessageFilter, message)
  32     IPC_MESSAGE_HANDLER(PpapiMsg_ReserveInstanceId, OnMsgReserveInstanceId)
  33     IPC_MESSAGE_UNHANDLED(handled = false)
  34   IPC_END_MESSAGE_MAP()
  35   return handled;
  36 }
  37
  38 bool PluginMessageFilter::Send(IPC::Message* msg) {
  39   if (channel_)
  40     return channel_->Send(msg);
  41   delete msg;
  42   return false;
  43 }
  44
  45 void PluginMessageFilter::OnMsgReserveInstanceId(PP_Instance instance,
  46                                                  bool* usable) {
  47   // See the message definition for how this works.
  48   if (seen_instance_ids_->find(instance) != seen_instance_ids_->end()) {
  49     // Instance ID already seen, reject it.
  50     *usable = false;
  51     return;
  52   }
  53
  54   // This instance ID is new so we can return that it's usable and mark it as
  55   // used for future reference.
  56   seen_instance_ids_->insert(instance);
  57   *usable = true;
  58 }
  59
  60 }  // namespace proxy
  61 }  // namespace ppapi