////  DataViewClass.cpp//////  Created by Clement on 7/8/14.//  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 "DataViewClass.h" #include "DataViewPrototype.h" Q_DECLARE_METATYPE(QByteArray*) static const QString DATA_VIEW_NAME = "DataView"; DataViewClass::DataViewClass(ScriptEngine* scriptEngine) : ArrayBufferViewClass(scriptEngine) {    QScriptValue global = engine()->globalObject();        // Save string handles for quick lookup    _name = engine()->toStringHandle(DATA_VIEW_NAME.toLatin1());        // build prototype    _proto = engine()->newQObject(new DataViewPrototype(this),                                QScriptEngine::QtOwnership,                                QScriptEngine::SkipMethodsInEnumeration |                                QScriptEngine::ExcludeSuperClassMethods |                                QScriptEngine::ExcludeSuperClassProperties);    _proto.setPrototype(global.property("Object").property("prototype"));        // Register constructor    _ctor = engine()->newFunction(construct, _proto);    _ctor.setData(engine()->toScriptValue(this));    engine()->globalObject().setProperty(name(), _ctor);} QScriptValue DataViewClass::newInstance(QScriptValue buffer, quint32 byteOffset, quint32 byteLentgh) {    QScriptValue data = engine()->newObject();    data.setProperty(_bufferName, buffer);    data.setProperty(_byteOffsetName, byteOffset);    data.setProperty(_byteLengthName, byteLentgh);        return engine()->newObject(this, data);} QScriptValue DataViewClass::construct(QScriptContext* context, QScriptEngine* engine) {    DataViewClass* cls = qscriptvalue_cast<DataViewClass*>(context->callee().data());    if (!cls || context->argumentCount() < 1) {        return QScriptValue();    }        QScriptValue bufferArg = context->argument(0);    QScriptValue byteOffsetArg = (context->argumentCount() >= 2) ? context->argument(1) : QScriptValue();    QScriptValue byteLengthArg = (context->argumentCount() >= 3) ? context->argument(2) : QScriptValue();        QByteArray* arrayBuffer = (bufferArg.isValid()) ? qscriptvalue_cast<QByteArray*>(bufferArg.data()) :NULL;    if (!arrayBuffer) {        engine->evaluate("throw \"TypeError: 1st argument not a ArrayBuffer\"");        return QScriptValue();    }    if (byteOffsetArg.isNumber() &&        (byteOffsetArg.toInt32() < 0 ||         byteOffsetArg.toInt32() > arrayBuffer->size())) {            engine->evaluate("throw \"RangeError: byteOffset out of range\"");            return QScriptValue();        }    if (byteLengthArg.isNumber() &&        (byteLengthArg.toInt32() < 0 ||         byteOffsetArg.toInt32() + byteLengthArg.toInt32() > arrayBuffer->size())) {            engine->evaluate("throw \"RangeError: byteLength out of range\"");            return QScriptValue();        }    quint32 byteOffset = (byteOffsetArg.isNumber()) ? byteOffsetArg.toInt32() : 0;    quint32 byteLength = (byteLengthArg.isNumber()) ? byteLengthArg.toInt32() : arrayBuffer->size() - byteOffset;    QScriptValue newObject = cls->newInstance(bufferArg, byteOffset, byteLength);        if (context->isCalledAsConstructor()) {        context->setThisObject(newObject);        return engine->undefinedValue();    }        return newObject;} QString DataViewClass::name() const {    return _name.toString();} QScriptValue DataViewClass::prototype() const {    return _proto;}