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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 "ppapi/proxy/plugin_var_tracker.h"
#include "base/ref_counted.h"
#include "ppapi/c/ppb_var.h"
#include "ppapi/proxy/plugin_dispatcher.h"
#include "ppapi/proxy/ppapi_messages.h"
namespace pp {
namespace proxy {
namespace {
class RefCountedString : public base::RefCounted<RefCountedString> {
public:
RefCountedString() {
}
RefCountedString(const std::string& str) : value_(str) {
}
RefCountedString(const char* data, size_t len)
: value_(data, len) {
}
const std::string& value() const { return value_; }
private:
std::string value_;
};
// When running in the plugin, this will convert the string ID to the object
// using casting. No validity checking is done.
RefCountedString* PluginStringFromID(int64 id) {
return reinterpret_cast<RefCountedString*>(static_cast<intptr_t>(id));
}
} // namespace
PluginVarTracker::PluginVarTracker(PluginDispatcher* dispatcher)
: dispatcher_(dispatcher) {
}
PluginVarTracker::~PluginVarTracker() {}
int64 PluginVarTracker::MakeString(const std::string& str) {
RefCountedString* out = new RefCountedString(str);
out->AddRef();
return static_cast<int64>(reinterpret_cast<intptr_t>(out));
}
int64 PluginVarTracker::MakeString(const char* str, uint32_t len) {
RefCountedString* out = new RefCountedString(str, len);
out->AddRef();
return static_cast<int64>(reinterpret_cast<intptr_t>(out));
}
std::string PluginVarTracker::GetString(const PP_Var& var) const {
return PluginStringFromID(var.value.as_id)->value();
}
const std::string* PluginVarTracker::GetExistingString(
const PP_Var& var) const {
if (var.type != PP_VARTYPE_STRING)
return NULL;
RefCountedString* str = PluginStringFromID(var.value.as_id);
return &str->value();
}
void PluginVarTracker::AddRef(const PP_Var& var) {
if (var.type == PP_VARTYPE_STRING) {
PluginStringFromID(var.value.as_id)->AddRef();
} else if (var.type == PP_VARTYPE_OBJECT && var.value.as_id != 0) {
int& ref_count = object_ref_count_[var.value.as_id];
ref_count++;
if (ref_count == 1) {
// We must handle the case where we got requested to AddRef an object
// that we've never seen before. This should tell the browser we've
// taken a ref. This comes up when the browser passes an object as an
// input param and holds a ref for us. We may not have seen that object
// and the plugin handler may want to AddRef and release it internally.
SendAddRefObjectMsg(var.value.as_id);
}
}
}
void PluginVarTracker::Release(const PP_Var& var) {
if (var.type == PP_VARTYPE_STRING) {
PluginStringFromID(var.value.as_id)->Release();
} else if (var.type == PP_VARTYPE_OBJECT) {
ObjectRefCount::iterator found = object_ref_count_.find(var.value.as_id);
if (found == object_ref_count_.end())
return; // Invalid object.
found->second--;
if (found->second == 0) {
// Plugin has released all of its refs, tell the browser.
object_ref_count_.erase(found);
SendReleaseObjectMsg(var.value.as_id);
}
}
}
void PluginVarTracker::ReceiveObjectPassRef(const PP_Var& var) {
// We're the plugin and the renderer just sent us a ref. The renderer has
// addrefed the var in its tracker for us since it's returning it.
//
// - If We don't have a reference to this already, then we just add it to
// our tracker and use that one ref.
//
// - If we do already have a reference to it, that means the renderer now
// has two references on our behalf. We want to transfer that extra
// reference to our list. This means we addref in the plugin, and release
// the extra one in the renderer.
ObjectRefCount::iterator found = object_ref_count_.find(var.value.as_id);
if (found == object_ref_count_.end()) {
object_ref_count_[var.value.as_id] = 1;
} else {
SendReleaseObjectMsg(var.value.as_id);
found->second++;
}
}
void PluginVarTracker::SendAddRefObjectMsg(int64_t id) {
dispatcher_->Send(new PpapiHostMsg_PPBVar_AddRefObject(
INTERFACE_ID_PPB_VAR_DEPRECATED, id));
}
void PluginVarTracker::SendReleaseObjectMsg(int64_t id) {
dispatcher_->Send(new PpapiHostMsg_PPBVar_ReleaseObject(
INTERFACE_ID_PPB_VAR_DEPRECATED, id));
}
} // namesace proxy
} // namespace pp
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