diff -r 000000000000 -r 1918ee327afb src/corelib/io/qnoncontiguousbytedevice_p.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/corelib/io/qnoncontiguousbytedevice_p.h	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,186 @@
+/****************************************************************************
+**
+** 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 QtCore 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 QNONCONTIGUOUSBYTEDEVICE_H
+#define QNONCONTIGUOUSBYTEDEVICE_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of a number of Qt sources files.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qobject.h>
+#include <QtCore/qbytearray.h>
+#include <QtCore/qbuffer.h>
+#include <QtCore/qiodevice.h>
+#include "private/qringbuffer_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class Q_CORE_EXPORT QNonContiguousByteDevice : public QObject
+{
+    Q_OBJECT
+public:
+    virtual const char* readPointer(qint64 maximumLength, qint64 &len) = 0;
+    virtual bool advanceReadPointer(qint64 amount) = 0;
+    virtual bool atEnd() = 0;
+    virtual bool reset() = 0;
+    void disableReset();
+    virtual qint64 size() = 0;
+
+    virtual ~QNonContiguousByteDevice();
+
+protected:
+    QNonContiguousByteDevice();
+
+
+    bool resetDisabled;
+Q_SIGNALS:
+    void readyRead();
+    void readProgress(qint64 current, qint64 total);
+};
+
+class Q_CORE_EXPORT QNonContiguousByteDeviceFactory
+{
+public:
+    static QNonContiguousByteDevice* create(QIODevice *device);
+    static QNonContiguousByteDevice* create(QByteArray *byteArray);
+    static QNonContiguousByteDevice* create(QRingBuffer *ringBuffer);
+    static QIODevice* wrap(QNonContiguousByteDevice* byteDevice);
+};
+
+// the actual implementations
+//
+
+class QNonContiguousByteDeviceByteArrayImpl : public QNonContiguousByteDevice
+{
+public:
+    QNonContiguousByteDeviceByteArrayImpl(QByteArray *ba);
+    ~QNonContiguousByteDeviceByteArrayImpl();
+    const char* readPointer(qint64 maximumLength, qint64 &len);
+    bool advanceReadPointer(qint64 amount);
+    bool atEnd();
+    bool reset();
+    qint64 size();
+protected:
+    QByteArray* byteArray;
+    qint64 currentPosition;
+};
+
+class QNonContiguousByteDeviceRingBufferImpl : public QNonContiguousByteDevice
+{
+public:
+    QNonContiguousByteDeviceRingBufferImpl(QRingBuffer *rb);
+    ~QNonContiguousByteDeviceRingBufferImpl();
+    const char* readPointer(qint64 maximumLength, qint64 &len);
+    bool advanceReadPointer(qint64 amount);
+    bool atEnd();
+    bool reset();
+    qint64 size();
+protected:
+    QRingBuffer* ringBuffer;
+    qint64 currentPosition;
+};
+
+
+class QNonContiguousByteDeviceIoDeviceImpl : public QNonContiguousByteDevice
+{
+public:
+    QNonContiguousByteDeviceIoDeviceImpl(QIODevice *d);
+    ~QNonContiguousByteDeviceIoDeviceImpl();
+    const char* readPointer(qint64 maximumLength, qint64 &len);
+    bool advanceReadPointer(qint64 amount);
+    bool atEnd();
+    bool reset();
+    qint64 size();
+protected:
+    QIODevice* device;
+    QByteArray* currentReadBuffer;
+    qint64 currentReadBufferSize;
+    qint64 currentReadBufferAmount;
+    qint64 currentReadBufferPosition;
+    qint64 totalAdvancements;
+    bool eof;
+    qint64 initialPosition;
+};
+
+class QNonContiguousByteDeviceBufferImpl : public QNonContiguousByteDevice
+{
+public:
+    QNonContiguousByteDeviceBufferImpl(QBuffer *b);
+    ~QNonContiguousByteDeviceBufferImpl();
+    const char* readPointer(qint64 maximumLength, qint64 &len);
+    bool advanceReadPointer(qint64 amount);
+    bool atEnd();
+    bool reset();
+    qint64 size();
+protected:
+    QBuffer* buffer;
+    QByteArray byteArray;
+    QNonContiguousByteDeviceByteArrayImpl* arrayImpl;
+};
+
+// ... and the reverse thing
+class QByteDeviceWrappingIoDevice : public QIODevice
+{
+public:
+    QByteDeviceWrappingIoDevice (QNonContiguousByteDevice *bd);
+    ~QByteDeviceWrappingIoDevice ();
+    virtual bool isSequential () const;
+    virtual bool atEnd () const;
+    virtual bool reset ();
+    virtual qint64 size () const;
+protected:
+     virtual qint64 readData ( char * data, qint64 maxSize );
+     virtual qint64 writeData ( const char * data, qint64 maxSize );
+
+     QNonContiguousByteDevice *byteDevice;
+};
+
+QT_END_NAMESPACE
+
+#endif