Fix QCborStreamReader not flushing QIODevices due to internal buffering

When successfully finishing a parse, it's reasonable to expect that the
QIODevice was advanced to the end of the input data.

[ChangeLog][QtCore][QCborStreamReader] Fixed a bug that caused the
QIODevice that the data was being read from not to show the entire CBOR
message as consumed. This allows the user to consume data that may
follow the CBOR payload.

Fixes: QTBUG-77076
Change-Id: I1024ee42da0c4323953afffd15b23f5d8fcc6f50
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

1 files changed, 69 insertions, 10 deletions

diff --git a/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp b/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp
index 4b753eab6b..9d453bd38e 100644
--- a/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp
+++ b/tests/auto/corelib/serialization/qcborvalue/tst_qcborvalue.cpp
@@ -91,8 +91,14 @@ private slots:
 
     void toCbor_data();
     void toCbor();
+    void toCborStreamWriter_data() { toCbor_data(); }
+    void toCborStreamWriter();
     void fromCbor_data();
     void fromCbor();
+    void fromCborStreamReaderByteArray_data() { fromCbor_data(); }
+    void fromCborStreamReaderByteArray();
+    void fromCborStreamReaderIODevice_data() { fromCbor_data(); }
+    void fromCborStreamReaderIODevice();
     void validation_data();
     void validation();
     void toDiagnosticNotation_data();
@@ -1395,6 +1401,22 @@ void tst_QCborValue::toCbor()
              "\xa1\x01\xd9\xd9\xf7" + result);
 }
 
+void tst_QCborValue::toCborStreamWriter()
+{
+    QFETCH(QCborValue, v);
+    QFETCH(QByteArray, result);
+    QFETCH(QCborValue::EncodingOptions, options);
+
+    QByteArray output;
+    QBuffer buffer(&output);
+    buffer.open(QIODevice::WriteOnly);
+    QCborStreamWriter writer(&buffer);
+
+    v.toCbor(writer, options);
+    QCOMPARE(buffer.pos(), result.size());
+    QCOMPARE(output, result);
+}
+
 void tst_QCborValue::fromCbor_data()
 {
     addCommonCborData();
@@ -1425,20 +1447,11 @@ void tst_QCborValue::fromCbor_data()
                                    << raw("\xd8\x25\x51" "\1\2\3\4""\4\3\2\0""\0\0\0\0""\0\0\0\1""\2");
 }
 
-void tst_QCborValue::fromCbor()
+void fromCbor_common(void (*doCheck)(const QCborValue &, const QByteArray &))
 {
     QFETCH(QCborValue, v);
     QFETCH(QByteArray, result);
 
-    auto doCheck = [](const QCborValue &v, const QByteArray &result) {
-        QCborParserError error;
-        QCborValue decoded = QCborValue::fromCbor(result, &error);
-        QVERIFY2(error.error == QCborError(), qPrintable(error.errorString()));
-        QCOMPARE(error.offset, result.size());
-        QVERIFY(decoded == v);
-        QVERIFY(v == decoded);
-    };
-
     doCheck(v, result);
     if (QTest::currentTestFailed())
         return;
@@ -1489,6 +1502,52 @@ void tst_QCborValue::fromCbor()
         return;
 }
 
+void tst_QCborValue::fromCbor()
+{
+    auto doCheck = [](const QCborValue &v, const QByteArray &result) {
+        QCborParserError error;
+        QCborValue decoded = QCborValue::fromCbor(result, &error);
+        QVERIFY2(error.error == QCborError(), qPrintable(error.errorString()));
+        QCOMPARE(error.offset, result.size());
+        QVERIFY(decoded == v);
+        QVERIFY(v == decoded);
+    };
+
+    fromCbor_common(doCheck);
+}
+
+void tst_QCborValue::fromCborStreamReaderByteArray()
+{
+    auto doCheck = [](const QCborValue &expected, const QByteArray &data) {
+        QCborStreamReader reader(data);
+        QCborValue decoded = QCborValue::fromCbor(reader);
+        QCOMPARE(reader.lastError(), QCborError());
+        QCOMPARE(reader.currentOffset(), data.size());
+        QVERIFY(decoded == expected);
+        QVERIFY(expected == decoded);
+    };
+
+    fromCbor_common(doCheck);
+}
+
+void tst_QCborValue::fromCborStreamReaderIODevice()
+{
+    auto doCheck = [](const QCborValue &expected, const QByteArray &data) {
+        QBuffer buffer;
+        buffer.setData(data);
+        buffer.open(QIODevice::ReadOnly);
+        QCborStreamReader reader(&buffer);
+        QCborValue decoded = QCborValue::fromCbor(reader);
+        QCOMPARE(reader.lastError(), QCborError());
+        QCOMPARE(reader.currentOffset(), data.size());
+        QVERIFY(decoded == expected);
+        QVERIFY(expected == decoded);
+        QCOMPARE(buffer.pos(), reader.currentOffset());
+    };
+
+    fromCbor_common(doCheck);
+}
+
 void tst_QCborValue::validation_data()
 {
     addValidationColumns();