Introduce QFileNetworkReply in QNetworkAccessManager

The QFileNetworkReply is a wrapper around QFile that
has therefore similar performance. This avoids
the usage of the unperformant QNetworkAccessFileBackend.

The benchmark qfile_vs_qnetworkaccessmanager shows
that the QFileNetworkReply's performance is better
than 0.9x of QFile compared to QNetworkAccessFileBackend
which had about 0.5x of QFile.

Reviewed-by: Peter Hartmann

1 files changed, 107 insertions, 0 deletions

diff --git a/src/network/access/qfilenetworkreply_p.h b/src/network/access/qfilenetworkreply_p.h
new file mode 100644
index 0000000..831f50a
--- /dev/null
+++ b/src/network/access/qfilenetworkreply_p.h
@@ -0,0 +1,107 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtNetwork module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QFILENETWORKREPLY_P_H
+#define QFILENETWORKREPLY_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of the Network Access API.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qnetworkreply.h"
+#include "qnetworkreply_p.h"
+#include "qnetworkaccessmanager.h"
+#include <QFile>
+
+QT_BEGIN_NAMESPACE
+
+
+class QFileNetworkReplyPrivate;
+class QFileNetworkReply: public QNetworkReply
+{
+    Q_OBJECT
+public:
+    QFileNetworkReply(QObject *parent, const QNetworkRequest &req);
+    ~QFileNetworkReply();
+    virtual void abort();
+
+    // reimplemented from QNetworkReply
+    virtual void close();
+    virtual qint64 bytesAvailable() const;
+    virtual bool isSequential () const;
+    qint64 size() const;
+
+
+    virtual qint64 readData(char *data, qint64 maxlen);
+
+    Q_DECLARE_PRIVATE(QFileNetworkReply)
+    Q_PRIVATE_SLOT(d_func(), void _q_startOperation())
+
+};
+
+class QFileNetworkReplyPrivate: public QNetworkReplyPrivate
+{
+public:
+    QFileNetworkReplyPrivate();
+
+    QFile realFile;
+    qint64 realFileSize;
+
+    void _q_startOperation();
+
+    virtual bool isFinished() const;
+    void doFinished();
+    bool finished;
+
+
+    Q_DECLARE_PUBLIC(QFileNetworkReply)
+};
+
+QT_END_NAMESPACE
+
+#endif // QFILENETWORKREPLY_P_H