Started on Resource class.

src/shared/ppapi_proxy/plugin_resource_tracker.cc

+// Copyright (c) 2010 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "native_client/src/shared/ppapi_proxy/plugin_resource_tracker.h"
+
+#include <limits>
+#include <set>
+
+#include "native_client/src/shared/ppapi_proxy/plugin_resource.h"
+#include "ppapi/c/pp_resource.h"
+
+namespace ppapi_proxy {
+
+scoped_refptr<PluginResource>
+PluginResourceTracker::GetResource(PP_Resource res) const {
+  ResourceMap::const_iterator result = live_resources_.find(res);
+  if (result == live_resources_.end()) {
+    return scoped_refptr<PluginResource>();
+  }
+  return result->second.first;
+}
+
+PluginResourceTracker::PluginResourceTracker()
+    : last_id_(0) {
+}
+
+PluginResourceTracker::~PluginResourceTracker() {
+}
+
+PP_Resource PluginResourceTracker::AddResource(PluginResource* resource) {
+  // If the plugin manages to create 4B resources...
+  if (last_id_ == std::numeric_limits<PP_Resource>::max()) {
+    return 0;
+  }
+  // Add the resource with plugin use-count 1.
+  ++last_id_;
+  live_resources_.insert(std::make_pair(last_id_, std::make_pair(resource, 1)));
+  return last_id_;
+}
+
+bool PluginResourceTracker::AddRefResource(PP_Resource res) {
+  ResourceMap::iterator i = live_resources_.find(res);
+  if (i == live_resources_.end()) {
+    return false;
+  } else {
+    // We don't protect against overflow, since a plugin as malicious as to ref
+    // once per every byte in the address space could have just as well unrefed
+    // one time too many.
+    ++i->second.second;
+    return true;
+  }
+}
+
+bool PluginResourceTracker::UnrefResource(PP_Resource res) {
+  ResourceMap::iterator i = live_resources_.find(res);
+  if (i != live_resources_.end()) {
+    if (!--i->second.second) {
+      i->second.first->StoppedTracking();
+      live_resources_.erase(i);
+    }
+    return true;
+  } else {
+    return false;
+  }
+}
+
+}  // namespace ppapi_proxy
+