////  ArrayBufferClass.cpp//////  Created by Clement on 7/3/14.//  Copyright 2014 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include <QDebug> #include "ArrayBufferPrototype.h"#include "ScriptEngine.h" #include "ArrayBufferClass.h" static const QString CLASS_NAME = "ArrayBuffer";static const QString BYTE_LENGTH_PROPERTY_NAME = "byteLength"; Q_DECLARE_METATYPE(QByteArray*) ArrayBufferClass::ArrayBufferClass(ScriptEngine* scriptEngine) :QObject(scriptEngine->getScriptEngine()),QScriptClass(scriptEngine->getScriptEngine()),_scriptEngine(scriptEngine) {    qDebug() << "Created with engine: " << engine();    qScriptRegisterMetaType<QByteArray>(engine(), toScriptValue, fromScriptValue);    QScriptValue global = engine()->globalObject();        // Save string handles for quick lookup    _name = engine()->toStringHandle(CLASS_NAME.toLatin1());    _byteLength = engine()->toStringHandle(BYTE_LENGTH_PROPERTY_NAME.toLatin1());        // build prototype    _proto = engine()->newQObject(new ArrayBufferPrototype(this),                                QScriptEngine::QtOwnership,                                QScriptEngine::SkipMethodsInEnumeration |                                QScriptEngine::ExcludeSuperClassMethods |                                QScriptEngine::ExcludeSuperClassProperties);     _proto.setPrototype(global.property("Object").property("prototype"));        _ctor = engine()->newFunction(construct, _proto);    _ctor.setData(engine()->toScriptValue(this));        engine()->globalObject().setProperty(name(), _ctor);} QScriptValue ArrayBufferClass::newInstance(qint32 size) {    const qint32 MAX_LENGTH = 100000000;    if (size < 0) {        engine()->evaluate("throw \"ArgumentError: negative length\"");        return QScriptValue();    }    if (size > MAX_LENGTH) {        engine()->evaluate("throw \"ArgumentError: absurd length\"");        return QScriptValue();    }        engine()->reportAdditionalMemoryCost(size);    QScriptEngine* eng = engine();    QVariant variant = QVariant::fromValue(QByteArray(size, 0));    QScriptValue data =  eng->newVariant(variant);    return engine()->newObject(this, data);} QScriptValue ArrayBufferClass::newInstance(const QByteArray& ba) {    QScriptValue data = engine()->newVariant(QVariant::fromValue(ba));    return engine()->newObject(this, data);} QScriptValue ArrayBufferClass::construct(QScriptContext* context, QScriptEngine* engine) {    ArrayBufferClass* cls = qscriptvalue_cast<ArrayBufferClass*>(context->callee().data());    if (!cls) {        return QScriptValue();    }        QScriptValue arg = context->argument(0);        if (!arg.isValid() || !arg.isNumber()) {        return QScriptValue();    }        quint32 size = arg.toInt32();    QScriptValue newObject = cls->newInstance(size);        if (context->isCalledAsConstructor()) {        context->setThisObject(newObject);        return engine->undefinedValue();    }        return newObject;} QScriptClass::QueryFlags ArrayBufferClass::queryProperty(const QScriptValue& object,                                                    const QScriptString& name,                                                    QueryFlags flags, uint* id) {    QByteArray* ba = qscriptvalue_cast<QByteArray*>(object.data());    if (ba && name == _byteLength) {        // if the property queried is byteLength, only handle read access        return flags &= HandlesReadAccess;    }    return 0; // No access} QScriptValue ArrayBufferClass::property(const QScriptValue &object,                                   const QScriptString &name, uint id) {    QByteArray* ba = qscriptvalue_cast<QByteArray*>(object.data());    if (ba && name == _byteLength) {        return ba->length();    }    return QScriptValue();} QScriptValue::PropertyFlags ArrayBufferClass::propertyFlags(const QScriptValue& object,                                                       const QScriptString& name, uint id) {    return QScriptValue::Undeletable;} QString ArrayBufferClass::name() const {    return _name.toString();} QScriptValue ArrayBufferClass::prototype() const {    return _proto;} QScriptValue ArrayBufferClass::toScriptValue(QScriptEngine* engine, const QByteArray& ba) {    QScriptValue ctor = engine->globalObject().property(CLASS_NAME);    ArrayBufferClass* cls = qscriptvalue_cast<ArrayBufferClass*>(ctor.data());    if (!cls) {        return engine->newVariant(QVariant::fromValue(ba));    }    return cls->newInstance(ba);} void ArrayBufferClass::fromScriptValue(const QScriptValue& obj, QByteArray& ba) {    ba = qvariant_cast<QByteArray>(obj.data().toVariant());}