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63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
/* This file is part of the KDE libraries
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Copyright (C) 2001, 2002, 2007 David Faure <faure@kde.org>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License version 2 as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#ifndef KLIMITEDIODEVICE_P_H
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#define KLIMITEDIODEVICE_P_H
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#include <QtCore/qiodevice.h>
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/**
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* A readonly device that reads from an underlying device
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* from a given point to another (e.g. to give access to a single
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* file inside an archive).
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* @author David Faure <faure@kde.org>
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* @internal - used by KArchive
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*/
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class KLimitedIODevice : public QIODevice
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{
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public:
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/**
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* Creates a new KLimitedIODevice.
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* @param dev the underlying device, opened or not
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* This device itself auto-opens (in readonly mode), no need to open it.
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* @param start where to start reading (position in bytes)
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* @param length the length of the data to read (in bytes)
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*/
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KLimitedIODevice( QIODevice *dev, qint64 start, qint64 length );
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virtual ~KLimitedIODevice() {}
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virtual bool isSequential() const;
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virtual bool open( QIODevice::OpenMode m );
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virtual void close();
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virtual qint64 size() const;
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virtual qint64 readData ( char * data, qint64 maxlen );
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virtual qint64 writeData ( const char *, qint64 ) { return -1; } // unsupported
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virtual int putChar( int ) { return -1; } // unsupported
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//virtual qint64 pos() const { return m_dev->pos() - m_start; }
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virtual bool seek( qint64 pos );
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virtual qint64 bytesAvailable() const;
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private:
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QIODevice* m_dev;
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qint64 m_start;
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qint64 m_length;
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};
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#endif
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