mirror of
https://github.com/classilla/tenfourfox.git
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307 lines
7.4 KiB
C++
307 lines
7.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 et :
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef dom_plugins_PluginScriptableObjectUtils_h
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#define dom_plugins_PluginScriptableObjectUtils_h
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#include "PluginModuleParent.h"
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#include "PluginModuleChild.h"
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#include "PluginInstanceParent.h"
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#include "PluginInstanceChild.h"
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#include "PluginScriptableObjectParent.h"
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#include "PluginScriptableObjectChild.h"
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#include "npapi.h"
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#include "npfunctions.h"
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#include "npruntime.h"
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#include "nsDebug.h"
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namespace mozilla {
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namespace plugins {
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inline PluginInstanceParent*
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GetInstance(NPObject* aObject)
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{
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NS_ASSERTION(aObject->_class == PluginScriptableObjectParent::GetClass(),
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"Bad class!");
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ParentNPObject* object = reinterpret_cast<ParentNPObject*>(aObject);
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if (object->invalidated) {
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NS_WARNING("Calling method on an invalidated object!");
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return nullptr;
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}
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if (!object->parent) {
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return nullptr;
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}
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return object->parent->GetInstance();
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}
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inline NPObject*
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NPObjectFromVariant(const Variant& aRemoteVariant)
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{
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switch (aRemoteVariant.type()) {
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case Variant::TPPluginScriptableObjectParent: {
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PluginScriptableObjectParent* actor =
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const_cast<PluginScriptableObjectParent*>(
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reinterpret_cast<const PluginScriptableObjectParent*>(
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aRemoteVariant.get_PPluginScriptableObjectParent()));
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return actor->GetObject(true);
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}
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case Variant::TPPluginScriptableObjectChild: {
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PluginScriptableObjectChild* actor =
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const_cast<PluginScriptableObjectChild*>(
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reinterpret_cast<const PluginScriptableObjectChild*>(
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aRemoteVariant.get_PPluginScriptableObjectChild()));
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return actor->GetObject(true);
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}
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default:
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NS_NOTREACHED("Shouldn't get here!");
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return nullptr;
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}
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}
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inline NPObject*
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NPObjectFromVariant(const NPVariant& aVariant)
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{
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NS_ASSERTION(NPVARIANT_IS_OBJECT(aVariant), "Wrong variant type!");
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return NPVARIANT_TO_OBJECT(aVariant);
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}
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inline const NPNetscapeFuncs*
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GetNetscapeFuncs(PluginInstanceParent* aInstance)
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{
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PluginModuleParent* module = aInstance->Module();
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if (!module) {
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NS_WARNING("Null module?!");
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return nullptr;
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}
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return module->GetNetscapeFuncs();
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}
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inline const NPNetscapeFuncs*
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GetNetscapeFuncs(NPObject* aObject)
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{
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NS_ASSERTION(aObject->_class == PluginScriptableObjectParent::GetClass(),
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"Bad class!");
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PluginInstanceParent* instance = GetInstance(aObject);
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if (!instance) {
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return nullptr;
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}
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return GetNetscapeFuncs(instance);
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}
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inline void
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ReleaseRemoteVariant(Variant& aVariant)
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{
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switch (aVariant.type()) {
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case Variant::TPPluginScriptableObjectParent: {
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PluginScriptableObjectParent* actor =
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const_cast<PluginScriptableObjectParent*>(
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reinterpret_cast<const PluginScriptableObjectParent*>(
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aVariant.get_PPluginScriptableObjectParent()));
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actor->Unprotect();
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break;
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}
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case Variant::TPPluginScriptableObjectChild: {
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NS_ASSERTION(XRE_GetProcessType() == GeckoProcessType_Plugin,
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"Should only be running in the child!");
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PluginScriptableObjectChild* actor =
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const_cast<PluginScriptableObjectChild*>(
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reinterpret_cast<const PluginScriptableObjectChild*>(
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aVariant.get_PPluginScriptableObjectChild()));
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actor->Unprotect();
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break;
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}
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default:
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break; // Intentional fall-through for other variant types.
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}
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aVariant = mozilla::void_t();
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}
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bool
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ConvertToVariant(const Variant& aRemoteVariant,
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NPVariant& aVariant,
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PluginInstanceParent* aInstance = nullptr);
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template <class InstanceType>
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bool
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ConvertToRemoteVariant(const NPVariant& aVariant,
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Variant& aRemoteVariant,
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InstanceType* aInstance,
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bool aProtectActors = false);
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class ProtectedVariant
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{
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public:
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ProtectedVariant(const NPVariant& aVariant,
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PluginInstanceParent* aInstance)
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{
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mOk = ConvertToRemoteVariant(aVariant, mVariant, aInstance, true);
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}
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ProtectedVariant(const NPVariant& aVariant,
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PluginInstanceChild* aInstance)
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{
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mOk = ConvertToRemoteVariant(aVariant, mVariant, aInstance, true);
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}
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~ProtectedVariant() {
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ReleaseRemoteVariant(mVariant);
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}
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bool IsOk() {
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return mOk;
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}
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operator const Variant&() {
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return mVariant;
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}
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private:
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Variant mVariant;
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bool mOk;
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};
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class ProtectedVariantArray
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{
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public:
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ProtectedVariantArray(const NPVariant* aArgs,
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uint32_t aCount,
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PluginInstanceParent* aInstance)
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: mUsingShadowArray(false)
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{
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for (uint32_t index = 0; index < aCount; index++) {
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Variant* remoteVariant = mArray.AppendElement();
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if (!(remoteVariant &&
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ConvertToRemoteVariant(aArgs[index], *remoteVariant, aInstance,
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true))) {
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mOk = false;
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return;
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}
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}
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mOk = true;
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}
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ProtectedVariantArray(const NPVariant* aArgs,
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uint32_t aCount,
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PluginInstanceChild* aInstance)
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: mUsingShadowArray(false)
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{
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for (uint32_t index = 0; index < aCount; index++) {
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Variant* remoteVariant = mArray.AppendElement();
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if (!(remoteVariant &&
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ConvertToRemoteVariant(aArgs[index], *remoteVariant, aInstance,
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true))) {
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mOk = false;
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return;
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}
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}
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mOk = true;
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}
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~ProtectedVariantArray()
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{
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InfallibleTArray<Variant>& vars = EnsureAndGetShadowArray();
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uint32_t count = vars.Length();
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for (uint32_t index = 0; index < count; index++) {
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ReleaseRemoteVariant(vars[index]);
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}
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}
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operator const InfallibleTArray<Variant>&()
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{
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return EnsureAndGetShadowArray();
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}
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bool IsOk()
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{
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return mOk;
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}
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private:
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InfallibleTArray<Variant>&
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EnsureAndGetShadowArray()
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{
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if (!mUsingShadowArray) {
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mShadowArray.SwapElements(mArray);
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mUsingShadowArray = true;
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}
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return mShadowArray;
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}
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// We convert the variants fallibly, but pass them to Call*()
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// methods as an infallible array
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nsTArray<Variant> mArray;
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InfallibleTArray<Variant> mShadowArray;
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bool mOk;
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bool mUsingShadowArray;
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};
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template<class ActorType>
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struct ProtectedActorTraits
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{
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static bool Nullable();
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};
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template<class ActorType, class Traits=ProtectedActorTraits<ActorType> >
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class ProtectedActor
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{
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public:
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explicit ProtectedActor(ActorType* aActor) : mActor(aActor)
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{
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if (!Traits::Nullable()) {
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NS_ASSERTION(mActor, "This should never be null!");
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}
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}
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~ProtectedActor()
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{
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if (Traits::Nullable() && !mActor)
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return;
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mActor->Unprotect();
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}
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ActorType* operator->()
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{
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return mActor;
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}
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explicit operator bool()
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{
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return !!mActor;
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}
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private:
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ActorType* mActor;
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};
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template<>
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struct ProtectedActorTraits<PluginScriptableObjectParent>
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{
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static bool Nullable() { return true; }
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};
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template<>
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struct ProtectedActorTraits<PluginScriptableObjectChild>
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{
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static bool Nullable() { return false; }
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};
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} /* namespace plugins */
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} /* namespace mozilla */
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#include "PluginScriptableObjectUtils-inl.h"
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#endif /* dom_plugins_PluginScriptableObjectUtils_h */
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