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#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