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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Qt-Security score:significant
#include "qqmllistaccessor_p.h"
#include <private/qqmlmetatype_p.h>
#include <QtCore/qdebug.h>
#include <QtCore/qmetasequence.h>
#include <QtCore/qstringlist.h>
#include <QtCore/qurl.h>
QT_BEGIN_NAMESPACE
QQmlListAccessor::QQmlListAccessor()
: m_type(Invalid)
{
}
QQmlListAccessor::~QQmlListAccessor()
{
}
QVariant QQmlListAccessor::list() const
{
return d;
}
void QQmlListAccessor::setList(const QVariant &v)
{
d = v;
// An incoming JS array as model is treated as a variant list, so we need to
// convert it first with toVariant().
QMetaType variantsType = d.metaType();
if (variantsType == QMetaType::fromType<QJSValue>()) {
d = d.value<QJSValue>().toVariant();
variantsType = d.metaType();
}
if (!d.isValid()) {
m_type = Invalid;
return;
}
if (variantsType == QMetaType::fromType<QStringList>()) {
m_type = StringList;
return;
}
if (variantsType == QMetaType::fromType<QList<QUrl>>()) {
m_type = UrlList;
return;
}
if (variantsType == QMetaType::fromType<QVariantList>()) {
m_type = VariantList;
return;
}
if (variantsType == QMetaType::fromType<QList<QObject *>>()) {
m_type = ObjectList;
return;
}
if (variantsType.flags() & QMetaType::IsQmlList) {
d = QVariant::fromValue(QQmlListReference(d));
m_type = ListProperty;
return;
}
if (variantsType == QMetaType::fromType<QQmlListReference>()) {
m_type = ListProperty;
return;
}
if (variantsType.flags() & QMetaType::PointerToQObject) {
m_type = Instance;
return;
}
if (int i = 0; [&](){bool ok = false; i = v.toInt(&ok); return ok;}()) {
// Here we have to check for an upper limit, because down the line code might (well, will)
// allocate memory depending on the number of elements. The upper limit cannot be INT_MAX:
// QList<QPointer<QQuickItem>> something;
// something.resize(count());
// (See e.g. QQuickRepeater::regenerate())
// This will allocate data along the lines of:
// sizeof(QPointer<QQuickItem>) * count() + QVector::headerSize
// So, doing an approximate round-down-to-nice-number, we get:
const int upperLimit = 100 * 1000 * 1000;
if (i < 0) {
qWarning("Model size of %d is less than 0", i);
m_type = Invalid;
return;
}
if (i > upperLimit) {
qWarning("Model size of %d is bigger than the upper limit %d", i, upperLimit);
m_type = Invalid;
return;
}
m_type = Integer;
d = i;
return;
}
const QQmlType type = QQmlMetaType::qmlListType(variantsType);
if (type.isSequentialContainer()) {
m_metaSequence = type.listMetaSequence();
m_type = m_metaSequence.valueMetaType().flags().testFlag(QMetaType::PointerToQObject)
? ObjectSequence
: ValueSequence;
return;
}
QMetaSequence::Iterable iterable;
if (QMetaType::convert(
variantsType, d.constData(),
QMetaType::fromType<QMetaSequence::Iterable>(), &iterable)) {
const QMetaSequence sequence = iterable.metaContainer();
if (sequence.hasSize() && sequence.canGetValueAtIndex()) {
// If the resulting iterable is useful for anything, use it.
m_metaSequence = sequence;
m_type = sequence.valueMetaType().flags().testFlag(QMetaType::PointerToQObject)
? ObjectSequence
: ValueSequence;
return;
}
if (sequence.hasConstIterator() && sequence.canGetValueAtConstIterator()) {
// As a last resort, try to read the contents of the container via an iterator
// and build a QVariantList from them.
QVariantList variantList;
for (auto it = iterable.constBegin(), end = iterable.constEnd(); it != end; ++it)
variantList.push_back(*it);
d = std::move(variantList);
m_type = VariantList;
return;
}
}
m_type = Instance;
return;
}
qsizetype QQmlListAccessor::count() const
{
switch(m_type) {
case StringList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QStringList>());
return reinterpret_cast<const QStringList *>(d.constData())->size();
case UrlList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QUrl>>());
return reinterpret_cast<const QList<QUrl> *>(d.constData())->size();
case VariantList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QVariantList>());
return reinterpret_cast<const QVariantList *>(d.constData())->size();
case ObjectList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QObject *>>());
return reinterpret_cast<const QList<QObject *> *>(d.constData())->size();
case ListProperty:
Q_ASSERT(d.metaType() == QMetaType::fromType<QQmlListReference>());
return reinterpret_cast<const QQmlListReference *>(d.constData())->count();
case ValueSequence:
case ObjectSequence:
Q_ASSERT(m_metaSequence != QMetaSequence());
return m_metaSequence.size(d.constData());
case Instance:
return 1;
case Integer:
return *reinterpret_cast<const int *>(d.constData());
case Invalid:
return 0;
}
Q_UNREACHABLE_RETURN(0);
}
QVariant QQmlListAccessor::at(qsizetype idx) const
{
Q_ASSERT(idx >= 0 && idx < count());
switch(m_type) {
case StringList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QStringList>());
return QVariant::fromValue(reinterpret_cast<const QStringList *>(d.constData())->at(idx));
case UrlList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QUrl>>());
return QVariant::fromValue(reinterpret_cast<const QList<QUrl> *>(d.constData())->at(idx));
case VariantList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QVariantList>());
return reinterpret_cast<const QVariantList *>(d.constData())->at(idx);
case ObjectList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QObject *>>());
return QVariant::fromValue(reinterpret_cast<const QList<QObject *> *>(d.constData())->at(idx));
case ListProperty:
Q_ASSERT(d.metaType() == QMetaType::fromType<QQmlListReference>());
return QVariant::fromValue(reinterpret_cast<const QQmlListReference *>(d.constData())->at(idx));
case ValueSequence:
case ObjectSequence: {
Q_ASSERT(m_metaSequence != QMetaSequence());
QVariant result;
const QMetaType valueMetaType = m_metaSequence.valueMetaType();
if (valueMetaType == QMetaType::fromType<QVariant>()) {
m_metaSequence.valueAtIndex(d.constData(), idx, &result);
} else {
result = QVariant(valueMetaType);
m_metaSequence.valueAtIndex(d.constData(), idx, result.data());
}
return result;
}
case Instance:
return d;
case Integer:
return QVariant(idx);
case Invalid:
return QVariant();
}
Q_UNREACHABLE_RETURN(QVariant());
}
void QQmlListAccessor::set(qsizetype idx, const QVariant &value)
{
Q_ASSERT(idx >= 0 && idx < count());
switch (m_type) {
case StringList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QStringList>());
(*static_cast<QStringList *>(d.data()))[idx] = value.toString();
break;
case UrlList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QUrl>>());
(*static_cast<QList<QUrl> *>(d.data()))[idx] = value.value<QUrl>();
break;
case VariantList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QVariantList>());
(*static_cast<QVariantList *>(d.data()))[idx] = value;
break;
case ObjectList:
Q_ASSERT(d.metaType() == QMetaType::fromType<QList<QObject *>>());
(*static_cast<QList<QObject *> *>(d.data()))[idx] = value.value<QObject *>();
break;
case ListProperty:
Q_ASSERT(d.metaType() == QMetaType::fromType<QQmlListReference>());
static_cast<QQmlListReference *>(d.data())->replace(idx, value.value<QObject *>());
break;
case ValueSequence:
case ObjectSequence: {
Q_ASSERT(m_metaSequence != QMetaSequence());
const QMetaType valueMetaType = m_metaSequence.valueMetaType();
if (valueMetaType == QMetaType::fromType<QVariant>()) {
m_metaSequence.setValueAtIndex(d.data(), idx, &value);
} else if (valueMetaType == value.metaType()) {
m_metaSequence.setValueAtIndex(d.data(), idx, value.constData());
} else {
QVariant converted = value;
converted.convert(valueMetaType);
m_metaSequence.setValueAtIndex(d.data(), idx, converted.constData());
}
break;
}
case Instance:
d = value;
break;
case Integer:
break;;
case Invalid:
break;
}
}
bool QQmlListAccessor::isValid() const
{
return m_type != Invalid;
}
QT_END_NAMESPACE