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Diffstat (limited to 'src/corelib/io/qnoncontiguousbytedevice_p.h')
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1 files changed, 190 insertions, 0 deletions
diff --git a/src/corelib/io/qnoncontiguousbytedevice_p.h b/src/corelib/io/qnoncontiguousbytedevice_p.h new file mode 100644 index 0000000000..5e0b1bbb8f --- /dev/null +++ b/src/corelib/io/qnoncontiguousbytedevice_p.h @@ -0,0 +1,190 @@ +/**************************************************************************** +** +** Copyright (C) 2011 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 <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; + 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 |