qdbusreply.cpp

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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
 
#include "qdbusreply.h"
#include "qdbusmetatype.h"
#include "qdbusmetatype_p.h"
#include <QDebug>
 
#ifndef QT_NO_DBUS
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
void qDBusReplyFill(const QDBusMessage &reply, QDBusError &error, QVariant &data)
{
    error = QDBusError(reply);
 
    if (error.isValid()) {
        data = QVariant();      // clear it
        return;
    }
 
    if (reply.arguments().size() >= 1 && reply.arguments().at(0).metaType() == data.metaType()) {
        data = reply.arguments().at(0);
        return;
    }
 
    const char *expectedSignature = QDBusMetaType::typeToSignature(data.metaType());
    const char *receivedType = nullptr;
    QByteArray receivedSignature;
 
    if (reply.arguments().size() >= 1) {
        if (reply.arguments().at(0).metaType() == QDBusMetaTypeId::argument()) {
            // compare signatures instead
            QDBusArgument arg = qvariant_cast<QDBusArgument>(reply.arguments().at(0));
            receivedSignature = arg.currentSignature().toLatin1();
            if (receivedSignature == expectedSignature) {
                // matched. Demarshall it
                QDBusMetaType::demarshall(arg, data.metaType(), data.data());
                return;
            }
        } else {
            // not an argument and doesn't match?
            QMetaType type = reply.arguments().at(0).metaType();
            receivedType = type.name();
            receivedSignature = QDBusMetaType::typeToSignature(type);
        }
    }
 
    // error
    if (receivedSignature.isEmpty())
        receivedSignature = "<empty signature>";
    QString errorMsg;
    if (receivedType) {
        errorMsg = "Unexpected reply signature: got \"%1\" (%4), expected \"%2\" (%3)"_L1
                   .arg(QLatin1StringView(receivedSignature),
                        QLatin1StringView(expectedSignature),
                        QLatin1StringView(data.typeName()),
                        QLatin1StringView(receivedType));
    } else {
        errorMsg = "Unexpected reply signature: got \"%1\", expected \"%2\" (%3)"_L1
                   .arg(QLatin1StringView(receivedSignature),
                        QLatin1StringView(expectedSignature),
                        QLatin1StringView(data.typeName()));
    }
 
    error = QDBusError(QDBusError::InvalidSignature, errorMsg);
    data = QVariant();      // clear it
}
 
QT_END_NAMESPACE
 
#endif // QT_NO_DBUS