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QCborArray: allow large but in-range keys

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The 0x10000 limit should not apply if the key is a valid index in the
array.

Change-Id: I5e52dc5b093c43a3b678fffd16b6a2a5a69acd61
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
This commit is contained in:
Thiago Macieira 2021-11-11 15:45:46 -08:00
parent 800f60657d
commit 3531f578d3
2 changed files with 42 additions and 2 deletions
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19
src/corelib/serialization/qcborvalue.cpp
View File

@ -2215,6 +2215,21 @@ const QCborValue QCborValue::operator[](qint64 key) const
return QCborValue();
}
static bool shouldArrayRemainArray(qint64 key, QCborValue::Type t, QCborContainerPrivate *container)
{
constexpr qint64 LargeKey = 0x10000;
if (t != QCborValue::Array)
return false;
if (key < 0)
return false; // negative keys can't be an array index
if (key < LargeKey)
return true;
// Only convert to map if key is greater than array size + 1
qsizetype currentSize = container ? container->elements.size() : 0;
return key <= currentSize;
}
/*!
\internal
*/
@ -2369,7 +2384,7 @@ QCborValueRef QCborValue::operator[](QLatin1String key)
*/
QCborValueRef QCborValue::operator[](qint64 key)
{
if (isArray() && key >= 0 && key < 0x10000) {
if (shouldArrayRemainArray(key, t, container)) {
container = maybeGrow(container, key);
return { container, qsizetype(key) };
}
@ -2898,7 +2913,7 @@ QCborValueRef QCborValueRef::operator[](QLatin1String key)
QCborValueRef QCborValueRef::operator[](qint64 key)
{
auto &e = d->elements[i];
if (e.type == QCborValue::Array && key >= 0 && key < 0x10000) {
if (shouldArrayRemainArray(key, e.type, e.container)) {
e.container = maybeGrow(e.container, key);
e.flags |= QtCbor::Element::IsContainer;
return { e.container, qsizetype(key) };

25
tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp
View File

@ -74,6 +74,7 @@ private slots:
void arrayPrepend();
void arrayValueRef_data() { basics_data(); }
void arrayValueRef();
void arrayValueRefLargeKey();
void arrayInsertRemove_data() { basics_data(); }
void arrayInsertRemove();
void arrayInsertTagged_data() { basics_data(); }
@ -1320,6 +1321,30 @@ void tst_QCborValue::arrayValueRef()
iteratorCheck(a.constBegin());
}
void tst_QCborValue::arrayValueRefLargeKey()
{
// make sure the access via QCborValue & QCborValueRef don't convert this
// array to a map
constexpr qsizetype LargeKey = 0x10000;
QCborArray a;
a[LargeKey + 1] = 123;
QCborValue v(a);
QCOMPARE(qAsConst(v)[LargeKey], QCborValue());
QCOMPARE(qAsConst(v)[LargeKey + 1], 123);
QCOMPARE(v[LargeKey], QCborValue());
QCOMPARE(v[LargeKey + 1], 123);
QCOMPARE(v.type(), QCborValue::Array);
QCborArray outer = { QCborValue(a) };
QCborValueRef ref = outer[0];
QCOMPARE(qAsConst(ref)[LargeKey], QCborValue());
QCOMPARE(qAsConst(ref)[LargeKey + 1], 123);
QCOMPARE(ref[LargeKey], QCborValue());
QCOMPARE(ref[LargeKey + 1], 123);
QCOMPARE(ref.type(), QCborValue::Array);
}
void tst_QCborValue::mapValueRef()
{
QFETCH(QCborValue, v);