////  ArrayBufferClass.cpp//////  Created by Clement on 7/3/14.//  Copyright 2014 High Fidelity, Inc.//  Copyright 2023 Overte e.V.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html//  SPDX-License-Identifier: Apache-2.0// #include "ArrayBufferClass.h" #include <QDebug> #include "ArrayBufferPrototype.h"#include "DataViewClass.h"#include "ScriptEngineV8.h"#include "TypedArrays.h"  // V8TODO Do not remove yet, this will be useful in later PRs/*static const QString CLASS_NAME = "ArrayBuffer"; // FIXME: Q_DECLARE_METATYPE is global and really belongs in a shared header file, not per .cpp like this// (see DataViewClass.cpp, etc. which would also have to be updated to resolve)Q_DECLARE_METATYPE(QByteArray*) ArrayBufferClass::ArrayBufferClass(ScriptEngineV8* scriptEngine) :QObject(scriptEngine),QScriptClass(scriptEngine) {    qScriptRegisterMetaType<QByteArray>(engine(), toScriptValue, fromScriptValue);    V8ScriptValue 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"));     // Register constructor    _ctor = engine()->newFunction(construct, _proto);    _ctor.setData(engine()->toScriptValue(this));     engine()->globalObject().setProperty(name(), _ctor);     // Registering other array types    // The script engine is there parent so it'll delete them with itself    new DataViewClass(scriptEngine);    new Int8ArrayClass(scriptEngine);    new Uint8ArrayClass(scriptEngine);    new Uint8ClampedArrayClass(scriptEngine);    new Int16ArrayClass(scriptEngine);    new Uint16ArrayClass(scriptEngine);    new Int32ArrayClass(scriptEngine);    new Uint32ArrayClass(scriptEngine);    new Float32ArrayClass(scriptEngine);    new Float64ArrayClass(scriptEngine);} V8ScriptValue ArrayBufferClass::newInstance(qint32 size) {    const qint32 MAX_LENGTH = 100000000;    if (size < 0) {        engine()->evaluate("throw \"ArgumentError: negative length\"");        return V8ScriptValue();    }    if (size > MAX_LENGTH) {        engine()->evaluate("throw \"ArgumentError: absurd length\"");        return V8ScriptValue();    }    // We've patched qt to fix https://highfidelity.atlassian.net/browse/BUGZ-46 on mac and windows only.#if defined(Q_OS_WIN) || defined(Q_OS_MAC)    engine()->reportAdditionalMemoryCost(size);#endif    QScriptEngine* eng = engine();    QVariant variant = QVariant::fromValue(QByteArray(size, 0));    V8ScriptValue data =  eng->newVariant(variant);    return engine()->newObject(this, data);} V8ScriptValue ArrayBufferClass::newInstance(const QByteArray& ba) {    QScriptEngine* eng = engine();    V8ScriptValue data = eng->newVariant(QVariant::fromValue(ba));    return eng->newObject(this, data);} V8ScriptValue ArrayBufferClass::construct(V8ScriptContext* context, QScriptEngine* engine) {    ArrayBufferClass* cls = qscriptvalue_cast<ArrayBufferClass*>(context->callee().data());    if (!cls) {        // return if callee (function called) is not of type ArrayBuffer        return V8ScriptValue();    }    V8ScriptValue arg = context->argument(0);    if (!arg.isValid() || !arg.isNumber()) {        return V8ScriptValue();    }     quint32 size = arg.toInt32();    V8ScriptValue newObject = cls->newInstance(size);     if (context->isCalledAsConstructor()) {        // if called with keyword new, replace this object.        context->setThisObject(newObject);        return engine->undefinedValue();    }     return newObject;} ScriptObjectV8Proxy::QueryFlags ArrayBufferClass::queryProperty(const V8ScriptValue& object,                                                    const V8ScriptString& 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 ScriptObjectV8Proxy::QueryFlags(); // No access} V8ScriptValue ArrayBufferClass::property(const V8ScriptValue& object,                                   const V8ScriptString& name, uint id) {    QByteArray* ba = qscriptvalue_cast<QByteArray*>(object.data());    if (ba && name == _byteLength) {        return ba->length();    }    return V8ScriptValue();} V8ScriptValue::PropertyFlags ArrayBufferClass::propertyFlags(const V8ScriptValue& object,                                                       const V8ScriptString& name, uint id) {    return V8ScriptValue::Undeletable;} QString ArrayBufferClass::name() const {    return _name.toString();} V8ScriptValue ArrayBufferClass::prototype() const {    return _proto;} V8ScriptValue ArrayBufferClass::toScriptValue(QScriptEngine* engine, const QByteArray& ba) {    V8ScriptValue ctor = engine->globalObject().property(CLASS_NAME);    ArrayBufferClass* cls = qscriptvalue_cast<ArrayBufferClass*>(ctor.data());    if (!cls) {        if (engine->currentContext()) {            engine->currentContext()->throwError("arrayBufferClass::toScriptValue -- could not get " + CLASS_NAME + " class constructor");        }        return V8ScriptValue::NullValue;    }    return cls->newInstance(ba);} void ArrayBufferClass::fromScriptValue(const V8ScriptValue& object, QByteArray& byteArray) {    if (object.isString()) {        // UTF-8 encoded String        byteArray = object.toString().toUtf8();    } else if (object.isArray()) {        // Array of uint8s eg: [ 128, 3, 25, 234 ]        auto Uint8Array = object.engine()->globalObject().property("Uint8Array");        auto typedArray = Uint8Array.construct(V8ScriptValueList{object});        if (QByteArray* buffer = qscriptvalue_cast<QByteArray*>(typedArray.property("buffer"))) {            byteArray = *buffer;        }    } else if (object.isObject()) {        // ArrayBuffer instance (or any JS class that supports coercion into QByteArray*)        if (QByteArray* buffer = qscriptvalue_cast<QByteArray*>(object.data())) {            byteArray = *buffer;        }    }}*/