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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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 <QtCore/QSharedPointer>
#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();
bool isResetDisabled() { return resetDisabled; }
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(QSharedPointer<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(QSharedPointer<QRingBuffer> rb);
~QNonContiguousByteDeviceRingBufferImpl();
const char* readPointer(qint64 maximumLength, qint64 &len);
bool advanceReadPointer(qint64 amount);
bool atEnd();
bool reset();
qint64 size();
protected:
QSharedPointer<QRingBuffer> ringBuffer;
qint64 currentPosition;
};
class QNonContiguousByteDeviceIoDeviceImpl : public QNonContiguousByteDevice
{
Q_OBJECT
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; //progress counter used for emitting the readProgress signal
bool eof;
qint64 initialPosition;
};
class QNonContiguousByteDeviceBufferImpl : public QNonContiguousByteDevice
{
Q_OBJECT
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
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