Split up base class QFileDevice for open-file operations (read/write)

This will be used later on as a base class for QTemporaryFile and
QSaveFile.

Change-Id: Ic2e1d232f95dc29b8e2f75e24a881ab459d3f037
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

1 files changed, 104 insertions, 0 deletions

diff --git a/src/corelib/io/qfiledevice_p.h b/src/corelib/io/qfiledevice_p.h
new file mode 100644
index 0000000000..2550cd73a2
--- /dev/null
+++ b/src/corelib/io/qfiledevice_p.h
@@ -0,0 +1,104 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QFILEDEVICE_P_H
+#define QFILEDEVICE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "private/qiodevice_p.h"
+#include "private/qringbuffer_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class QAbstractFileEngine;
+class QFSFileEngine;
+
+class QFileDevicePrivate : public QIODevicePrivate
+{
+    Q_DECLARE_PUBLIC(QFileDevice)
+protected:
+    QFileDevicePrivate();
+    ~QFileDevicePrivate();
+
+    virtual QAbstractFileEngine *engine() const;
+
+    QFileDevice::FileHandleFlags handleFlags;
+
+    mutable QAbstractFileEngine *fileEngine;
+    bool lastWasWrite;
+    QRingBuffer writeBuffer;
+    inline bool ensureFlushed() const;
+
+    bool putCharHelper(char c);
+
+    QFileDevice::FileError error;
+    void setError(QFileDevice::FileError err);
+    void setError(QFileDevice::FileError err, const QString &errorString);
+    void setError(QFileDevice::FileError err, int errNum);
+
+    mutable qint64 cachedSize;
+};
+
+inline bool QFileDevicePrivate::ensureFlushed() const
+{
+    // This function ensures that the write buffer has been flushed (const
+    // because certain const functions need to call it.
+    if (lastWasWrite) {
+        const_cast<QFileDevicePrivate *>(this)->lastWasWrite = false;
+        if (!const_cast<QFileDevice *>(q_func())->flush())
+            return false;
+    }
+    return true;
+}
+
+QT_END_NAMESPACE
+
+#endif // QFILEDEVICE_P_H