gecko/dom/plugins/ipc/PluginScriptableObjectUtils.h
2012-05-21 12:12:37 +01:00

307 lines
7.3 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 et :
* 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/. */
#ifndef dom_plugins_PluginScriptableObjectUtils_h
#define dom_plugins_PluginScriptableObjectUtils_h
#include "PluginModuleParent.h"
#include "PluginModuleChild.h"
#include "PluginInstanceParent.h"
#include "PluginInstanceChild.h"
#include "PluginScriptableObjectParent.h"
#include "PluginScriptableObjectChild.h"
#include "npapi.h"
#include "npfunctions.h"
#include "npruntime.h"
#include "nsDebug.h"
namespace mozilla {
namespace plugins {
inline PluginInstanceParent*
GetInstance(NPObject* aObject)
{
NS_ASSERTION(aObject->_class == PluginScriptableObjectParent::GetClass(),
"Bad class!");
ParentNPObject* object = reinterpret_cast<ParentNPObject*>(aObject);
if (object->invalidated) {
NS_WARNING("Calling method on an invalidated object!");
return nsnull;
}
if (!object->parent) {
return nsnull;
}
return object->parent->GetInstance();
}
inline NPObject*
NPObjectFromVariant(const Variant& aRemoteVariant)
{
switch (aRemoteVariant.type()) {
case Variant::TPPluginScriptableObjectParent: {
PluginScriptableObjectParent* actor =
const_cast<PluginScriptableObjectParent*>(
reinterpret_cast<const PluginScriptableObjectParent*>(
aRemoteVariant.get_PPluginScriptableObjectParent()));
return actor->GetObject(true);
}
case Variant::TPPluginScriptableObjectChild: {
PluginScriptableObjectChild* actor =
const_cast<PluginScriptableObjectChild*>(
reinterpret_cast<const PluginScriptableObjectChild*>(
aRemoteVariant.get_PPluginScriptableObjectChild()));
return actor->GetObject(true);
}
default:
NS_NOTREACHED("Shouldn't get here!");
return nsnull;
}
}
inline NPObject*
NPObjectFromVariant(const NPVariant& aVariant)
{
NS_ASSERTION(NPVARIANT_IS_OBJECT(aVariant), "Wrong variant type!");
return NPVARIANT_TO_OBJECT(aVariant);
}
inline const NPNetscapeFuncs*
GetNetscapeFuncs(PluginInstanceParent* aInstance)
{
PluginModuleParent* module = aInstance->Module();
if (!module) {
NS_WARNING("Null module?!");
return nsnull;
}
return module->GetNetscapeFuncs();
}
inline const NPNetscapeFuncs*
GetNetscapeFuncs(NPObject* aObject)
{
NS_ASSERTION(aObject->_class == PluginScriptableObjectParent::GetClass(),
"Bad class!");
PluginInstanceParent* instance = GetInstance(aObject);
if (!instance) {
return nsnull;
}
return GetNetscapeFuncs(instance);
}
inline void
ReleaseRemoteVariant(Variant& aVariant)
{
switch (aVariant.type()) {
case Variant::TPPluginScriptableObjectParent: {
PluginScriptableObjectParent* actor =
const_cast<PluginScriptableObjectParent*>(
reinterpret_cast<const PluginScriptableObjectParent*>(
aVariant.get_PPluginScriptableObjectParent()));
actor->Unprotect();
break;
}
case Variant::TPPluginScriptableObjectChild: {
NS_ASSERTION(PluginModuleChild::current(),
"Should only be running in the child!");
PluginScriptableObjectChild* actor =
const_cast<PluginScriptableObjectChild*>(
reinterpret_cast<const PluginScriptableObjectChild*>(
aVariant.get_PPluginScriptableObjectChild()));
actor->Unprotect();
break;
}
default:
break; // Intentional fall-through for other variant types.
}
aVariant = mozilla::void_t();
}
bool
ConvertToVariant(const Variant& aRemoteVariant,
NPVariant& aVariant,
PluginInstanceParent* aInstance = nsnull);
template <class InstanceType>
bool
ConvertToRemoteVariant(const NPVariant& aVariant,
Variant& aRemoteVariant,
InstanceType* aInstance,
bool aProtectActors = false);
class ProtectedVariant
{
public:
ProtectedVariant(const NPVariant& aVariant,
PluginInstanceParent* aInstance)
{
mOk = ConvertToRemoteVariant(aVariant, mVariant, aInstance, true);
}
ProtectedVariant(const NPVariant& aVariant,
PluginInstanceChild* aInstance)
{
mOk = ConvertToRemoteVariant(aVariant, mVariant, aInstance, true);
}
~ProtectedVariant() {
ReleaseRemoteVariant(mVariant);
}
bool IsOk() {
return mOk;
}
operator const Variant&() {
return mVariant;
}
private:
Variant mVariant;
bool mOk;
};
class ProtectedVariantArray
{
public:
ProtectedVariantArray(const NPVariant* aArgs,
PRUint32 aCount,
PluginInstanceParent* aInstance)
: mUsingShadowArray(false)
{
for (PRUint32 index = 0; index < aCount; index++) {
Variant* remoteVariant = mArray.AppendElement();
if (!(remoteVariant &&
ConvertToRemoteVariant(aArgs[index], *remoteVariant, aInstance,
true))) {
mOk = false;
return;
}
}
mOk = true;
}
ProtectedVariantArray(const NPVariant* aArgs,
PRUint32 aCount,
PluginInstanceChild* aInstance)
: mUsingShadowArray(false)
{
for (PRUint32 index = 0; index < aCount; index++) {
Variant* remoteVariant = mArray.AppendElement();
if (!(remoteVariant &&
ConvertToRemoteVariant(aArgs[index], *remoteVariant, aInstance,
true))) {
mOk = false;
return;
}
}
mOk = true;
}
~ProtectedVariantArray()
{
InfallibleTArray<Variant>& vars = EnsureAndGetShadowArray();
PRUint32 count = vars.Length();
for (PRUint32 index = 0; index < count; index++) {
ReleaseRemoteVariant(vars[index]);
}
}
operator const InfallibleTArray<Variant>&()
{
return EnsureAndGetShadowArray();
}
bool IsOk()
{
return mOk;
}
private:
InfallibleTArray<Variant>&
EnsureAndGetShadowArray()
{
if (!mUsingShadowArray) {
mShadowArray.SwapElements(mArray);
mUsingShadowArray = true;
}
return mShadowArray;
}
// We convert the variants fallibly, but pass them to Call*()
// methods as an infallible array
nsTArray<Variant> mArray;
InfallibleTArray<Variant> mShadowArray;
bool mOk;
bool mUsingShadowArray;
};
template<class ActorType>
struct ProtectedActorTraits
{
static bool Nullable();
};
template<class ActorType, class Traits=ProtectedActorTraits<ActorType> >
class ProtectedActor
{
public:
ProtectedActor(ActorType* aActor) : mActor(aActor)
{
if (!Traits::Nullable()) {
NS_ASSERTION(mActor, "This should never be null!");
}
}
~ProtectedActor()
{
if (Traits::Nullable() && !mActor)
return;
mActor->Unprotect();
}
ActorType* operator->()
{
return mActor;
}
operator bool()
{
return !!mActor;
}
private:
ActorType* mActor;
};
template<>
struct ProtectedActorTraits<PluginScriptableObjectParent>
{
static bool Nullable() { return true; }
};
template<>
struct ProtectedActorTraits<PluginScriptableObjectChild>
{
static bool Nullable() { return false; }
};
} /* namespace plugins */
} /* namespace mozilla */
#include "PluginScriptableObjectUtils-inl.h"
#endif /* dom_plugins_PluginScriptableObjectUtils_h */