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// Copyright (c) 2010 The Chromium 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 "webkit/glue/plugins/pepper_resource_tracker.h"
#include <limits>
#include <set>
#include "base/logging.h"
#include "third_party/ppapi/c/pp_resource.h"
#include "webkit/glue/plugins/pepper_resource.h"
namespace pepper {
scoped_refptr<Resource> ResourceTracker::GetResource(PP_Resource res) const {
ResourceMap::const_iterator result = live_resources_.find(res);
if (result == live_resources_.end()) {
return scoped_refptr<Resource>();
}
return result->second.first;
}
PP_Resource ResourceTracker::AddResource(Resource* 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 ResourceTracker::AddRefResource(PP_Resource res) {
ResourceMap::iterator i = live_resources_.find(res);
if (i != live_resources_.end()) {
// 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;
} else {
return false;
}
}
bool ResourceTracker::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 pepper
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