9 files changed, 200 insertions, 4 deletions
diff --git a/src/corelib/serialization/qcborarray.cpp b/src/corelib/serialization/qcborarray.cpp
index 921fcf2fca4..c8df594c079 100644
--- a/src/corelib/serialization/qcborarray.cpp
+++ b/src/corelib/serialization/qcborarray.cpp
@@ -39,6 +39,7 @@
 
 #include "qcborarray.h"
 #include "qcborvalue_p.h"
+#include "qdatastream.h"
 
 QT_BEGIN_NAMESPACE
 
@@ -1210,4 +1211,23 @@ QDebug operator<<(QDebug dbg, const QCborArray &a)
 }
 #endif
 
+#ifndef QT_NO_DATASTREAM
+QDataStream &operator<<(QDataStream &stream, const QCborArray &value)
+{
+    stream << value.toCborValue().toCbor();
+    return stream;
+}
+
+QDataStream &operator>>(QDataStream &stream, QCborArray &value)
+{
+    QByteArray buffer;
+    stream >> buffer;
+    QCborParserError parseError{};
+    value = QCborValue::fromCbor(buffer, &parseError).toArray();
+    if (parseError.error)
+        stream.setStatus(QDataStream::ReadCorruptData);
+    return stream;
+}
+#endif
+
 QT_END_NAMESPACE
diff --git a/src/corelib/serialization/qcborarray.h b/src/corelib/serialization/qcborarray.h
index f24bb41759c..9663ee6acde 100644
--- a/src/corelib/serialization/qcborarray.h
+++ b/src/corelib/serialization/qcborarray.h
@@ -47,6 +47,7 @@
 QT_BEGIN_NAMESPACE
 
 class QJsonArray;
+class QDataStream;
 
 class QCborContainerPrivate;
 class Q_CORE_EXPORT QCborArray
@@ -293,6 +294,11 @@ Q_CORE_EXPORT uint qHash(const QCborArray &array, uint seed = 0);
 Q_CORE_EXPORT QDebug operator<<(QDebug, const QCborArray &a);
 #endif
 
+#ifndef QT_NO_DATASTREAM
+Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QCborArray &);
+Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QCborArray &);
+#endif
+
 QT_END_NAMESPACE
 
 #endif // QCBORARRAY_H
diff --git a/src/corelib/serialization/qcbormap.cpp b/src/corelib/serialization/qcbormap.cpp
index 33f92499934..4b28ca4a2ee 100644
--- a/src/corelib/serialization/qcbormap.cpp
+++ b/src/corelib/serialization/qcbormap.cpp
@@ -1763,4 +1763,23 @@ QDebug operator<<(QDebug dbg, const QCborMap &m)
 }
 #endif
 
+#ifndef QT_NO_DATASTREAM
+QDataStream &operator<<(QDataStream &stream, const QCborMap &value)
+{
+    stream << value.toCborValue().toCbor();
+    return stream;
+}
+
+QDataStream &operator>>(QDataStream &stream, QCborMap &value)
+{
+    QByteArray buffer;
+    stream >> buffer;
+    QCborParserError parseError{};
+    value = QCborValue::fromCbor(buffer, &parseError).toMap();
+    if (parseError.error)
+        stream.setStatus(QDataStream::ReadCorruptData);
+    return stream;
+}
+#endif
+
 QT_END_NAMESPACE
diff --git a/src/corelib/serialization/qcbormap.h b/src/corelib/serialization/qcbormap.h
index 45ef430e409..866b7cd743b 100644
--- a/src/corelib/serialization/qcbormap.h
+++ b/src/corelib/serialization/qcbormap.h
@@ -52,6 +52,7 @@ typedef QMap<QString, QVariant> QVariantMap;
 template <class Key, class T> class QHash;
 typedef QHash<QString, QVariant> QVariantHash;
 class QJsonObject;
+class QDataStream;
 
 class QCborContainerPrivate;
 class Q_CORE_EXPORT QCborMap
@@ -344,6 +345,12 @@ Q_CORE_EXPORT uint qHash(const QCborMap &map, uint seed = 0);
 Q_CORE_EXPORT QDebug operator<<(QDebug, const QCborMap &m);
 #endif
 
+#ifndef QT_NO_DATASTREAM
+Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QCborMap &);
+Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QCborMap &);
+#endif
+
+
 QT_END_NAMESPACE
 
 #endif // QCBORMAP_H
diff --git a/src/corelib/serialization/qcborvalue.cpp b/src/corelib/serialization/qcborvalue.cpp
index 077a4754dc2..8673628c692 100644
--- a/src/corelib/serialization/qcborvalue.cpp
+++ b/src/corelib/serialization/qcborvalue.cpp
@@ -39,7 +39,7 @@
 
 #include "qcborvalue.h"
 #include "qcborvalue_p.h"
-
+#include "qdatastream.h"
 #include "qcborarray.h"
 #include "qcbormap.h"
 #include "qcborstream.h"
@@ -2469,6 +2469,26 @@ QDebug operator<<(QDebug dbg, const QCborValue &v)
 }
 #endif
 
+#ifndef QT_NO_DATASTREAM
+QDataStream &operator<<(QDataStream &stream, const QCborValue &value)
+{
+    stream << QCborValue(value).toCbor();
+    return stream;
+}
+
+QDataStream &operator>>(QDataStream &stream, QCborValue &value)
+{
+    QByteArray buffer;
+    stream >> buffer;
+    QCborParserError parseError{};
+    value = QCborValue::fromCbor(buffer, &parseError);
+    if (parseError.error)
+        stream.setStatus(QDataStream::ReadCorruptData);
+    return stream;
+}
+#endif
+
+
 QT_END_NAMESPACE
 
 #include "qcborarray.cpp"
diff --git a/src/corelib/serialization/qcborvalue.h b/src/corelib/serialization/qcborvalue.h
index 6d9ed0810ae..0aacbbe66ee 100644
--- a/src/corelib/serialization/qcborvalue.h
+++ b/src/corelib/serialization/qcborvalue.h
@@ -67,6 +67,7 @@ class QCborArray;
 class QCborMap;
 class QCborStreamReader;
 class QCborStreamWriter;
+class QDataStream;
 
 struct QCborParserError
 {
@@ -457,6 +458,11 @@ Q_CORE_EXPORT uint qHash(const QCborValue &value, uint seed = 0);
 Q_CORE_EXPORT QDebug operator<<(QDebug, const QCborValue &v);
 #endif
 
+#ifndef QT_NO_DATASTREAM
+Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QCborValue &);
+Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QCborValue &);
+#endif
+
 QT_END_NAMESPACE
 
 #if defined(QT_X11_DEFINES_FOUND)
diff --git a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
index 2674d82754d..0c328dff582 100644
--- a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
+++ b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
@@ -1821,9 +1821,6 @@ DECLARE_NONSTREAMABLE(void)
 DECLARE_NONSTREAMABLE(void*)
 DECLARE_NONSTREAMABLE(QModelIndex)
 DECLARE_NONSTREAMABLE(QPersistentModelIndex)
-DECLARE_NONSTREAMABLE(QCborValue)
-DECLARE_NONSTREAMABLE(QCborArray)
-DECLARE_NONSTREAMABLE(QCborMap)
 DECLARE_NONSTREAMABLE(QObject*)
 DECLARE_NONSTREAMABLE(QWidget*)
 
diff --git a/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp b/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp
index b69c993efbc..9ec9a57eb83 100644
--- a/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp
+++ b/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp
@@ -97,6 +97,10 @@ private slots:
     void validation();
     void toDiagnosticNotation_data();
     void toDiagnosticNotation();
+
+    void datastreamSerialization_data();
+    void datastreamSerialization();
+    void streamVariantSerialization();
 };
 
 // Get the validation data from TinyCBOR (see src/3rdparty/tinycbor/tests/parser/data.cpp)
@@ -1687,6 +1691,83 @@ void tst_QCborValue::toDiagnosticNotation()
     QCOMPARE(result, expected);
 }
 
+
+void tst_QCborValue::datastreamSerialization_data()
+{
+    addCommonCborData();
+}
+
+void tst_QCborValue::datastreamSerialization()
+{
+    QFETCH(QCborValue, v);
+    QByteArray buffer;
+    {
+        QDataStream save(&buffer, QIODevice::WriteOnly);
+        save << v;
+        QDataStream load(buffer);
+        QCborValue output;
+        load >> output;
+        QCOMPARE(output, v);
+    }
+    if (v.isArray()) {
+        QCborArray array = v.toArray();
+        QDataStream save(&buffer, QIODevice::WriteOnly);
+        save << array;
+        QDataStream load(buffer);
+        QCborValue output;
+        load >> output;
+        QCOMPARE(output, array);
+    } else if (v.isMap()) {
+        QCborMap map = v.toMap();
+        QDataStream save(&buffer, QIODevice::WriteOnly);
+        save << map;
+        QDataStream load(buffer);
+        QCborValue output;
+        load >> output;
+        QCOMPARE(output, map);
+    }
+}
+
+void tst_QCborValue::streamVariantSerialization()
+{
+    // Check interface only, implementation is tested through to and from
+    // cbor functions.
+    QByteArray buffer;
+    {
+        QCborArray array{665, 666, 667};
+        QVariant output;
+        QVariant variant = QVariant::fromValue(array);
+        QDataStream save(&buffer, QIODevice::WriteOnly);
+        save << variant;
+        QDataStream load(buffer);
+        load >> output;
+        QCOMPARE(output.userType(), QMetaType::QCborArray);
+        QCOMPARE(qvariant_cast<QCborArray>(output), array);
+    }
+    {
+        QCborMap obj{{"foo", 42}};
+        QVariant output;
+        QVariant variant = QVariant::fromValue(obj);
+        QDataStream save(&buffer, QIODevice::WriteOnly);
+        save << variant;
+        QDataStream load(buffer);
+        load >> output;
+        QCOMPARE(output.userType(), QMetaType::QCborMap);
+        QCOMPARE(qvariant_cast<QCborMap>(output), obj);
+    }
+    {
+        QCborValue value{42};
+        QVariant output;
+        QVariant variant = QVariant::fromValue(value);
+        QDataStream save(&buffer, QIODevice::WriteOnly);
+        save << variant;
+        QDataStream load(buffer);
+        load >> output;
+        QCOMPARE(output.userType(), QMetaType::QCborValue);
+        QCOMPARE(qvariant_cast<QCborValue>(output), value);
+    }
+}
+
 QTEST_MAIN(tst_QCborValue)
 
 #include "tst_qcborvalue.moc"
diff --git a/tests/auto/corelib/serialization/qdatastream/tst_qdatastream.cpp b/tests/auto/corelib/serialization/qdatastream/tst_qdatastream.cpp
index de3976bf80c..085a638eb7b 100644
--- a/tests/auto/corelib/serialization/qdatastream/tst_qdatastream.cpp
+++ b/tests/auto/corelib/serialization/qdatastream/tst_qdatastream.cpp
@@ -140,6 +140,10 @@ private slots:
     void stream_QJsonObject();
     void stream_QJsonValue();
 
+    void stream_QCborArray();
+    void stream_QCborMap();
+    void stream_QCborValue();
+
     void setVersion_data();
     void setVersion();
 
@@ -2196,6 +2200,42 @@ void tst_QDataStream::stream_QJsonValue()
     }
 }
 
+void tst_QDataStream::stream_QCborArray()
+{
+    QByteArray buffer;
+    QDataStream save(&buffer, QIODevice::WriteOnly);
+    QCborArray arraySave({1, 2, 3});
+    save << arraySave;
+    QDataStream load(&buffer, QIODevice::ReadOnly);
+    QCborArray arrayLoad;
+    load >> arrayLoad;
+    QCOMPARE(arrayLoad, arraySave);
+}
+
+void tst_QDataStream::stream_QCborMap()
+{
+    QByteArray buffer;
+    QDataStream save(&buffer, QIODevice::WriteOnly);
+    QCborMap objSave{{"foo", 1}, {"bar", 2}};
+    save << objSave;
+    QDataStream load(&buffer, QIODevice::ReadOnly);
+    QCborMap objLoad;
+    load >> objLoad;
+    QCOMPARE(objLoad, objSave);
+}
+
+void tst_QDataStream::stream_QCborValue()
+{
+    QByteArray buffer;
+    QDataStream save(&buffer, QIODevice::WriteOnly);
+    QCborValue valueSave{42};
+    save << valueSave;
+    QDataStream load(&buffer, QIODevice::ReadOnly);
+    QCborValue valueLoad;
+    load >> valueLoad;
+    QCOMPARE(valueLoad, valueSave);
+}
+
 void tst_QDataStream::setVersion_data()
 {
     QTest::addColumn<int>("vers");