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102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
#ifndef QUAZIP_QUAZIODEVICE_H
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#define QUAZIP_QUAZIODEVICE_H
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/*
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Copyright (C) 2005-2014 Sergey A. Tachenov
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This file is part of QuaZIP.
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QuaZIP is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 2.1 of the License, or
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(at your option) any later version.
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QuaZIP 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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with QuaZIP. If not, see <http://www.gnu.org/licenses/>.
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See COPYING file for the full LGPL text.
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Original ZIP package is copyrighted by Gilles Vollant and contributors,
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see quazip/(un)zip.h files for details. Basically it's the zlib license.
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*/
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#include <QIODevice>
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#include "quazip_global.h"
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#include <zlib.h>
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class QuaZIODevicePrivate;
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/// A class to compress/decompress QIODevice.
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/**
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This class can be used to compress any data written to QIODevice or
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decompress it back. Compressing data sent over a QTcpSocket is a good
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example.
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*/
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class QUAZIP_EXPORT QuaZIODevice: public QIODevice {
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Q_OBJECT
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public:
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/// Constructor.
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/**
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\param io The QIODevice to read/write.
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\param parent The parent object, as per QObject logic.
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*/
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QuaZIODevice(QIODevice *io, QObject *parent = NULL);
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/// Destructor.
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~QuaZIODevice();
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/// Flushes data waiting to be written.
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/**
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Unfortunately, as QIODevice doesn't support flush() by itself, the
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only thing this method does is write the compressed data into the
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device using Z_SYNC_FLUSH mode. If you need the compressed data to
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actually be flushed from the buffer of the underlying QIODevice, you
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need to call its flush() method as well, providing it supports it
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(like QTcpSocket does). Example:
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\code
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QuaZIODevice dev(&sock);
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dev.open(QIODevice::Write);
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dev.write(yourDataGoesHere);
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dev.flush();
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sock->flush(); // this actually sends data to network
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\endcode
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This may change in the future versions of QuaZIP by implementing an
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ugly hack: trying to cast the QIODevice using qobject_cast to known
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flush()-supporting subclasses, and calling flush if the resulting
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pointer is not zero.
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*/
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virtual bool flush();
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/// Opens the device.
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/**
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\param mode Neither QIODevice::ReadWrite nor QIODevice::Append are
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not supported.
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*/
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virtual bool open(QIODevice::OpenMode mode);
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/// Closes this device, but not the underlying one.
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/**
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The underlying QIODevice is not closed in case you want to write
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something else to it.
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*/
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virtual void close();
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/// Returns the underlying device.
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QIODevice *getIoDevice() const;
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/// Returns true.
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virtual bool isSequential() const;
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/// Returns true iff the end of the compressed stream is reached.
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virtual bool atEnd() const;
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/// Returns the number of the bytes buffered.
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virtual qint64 bytesAvailable() const;
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protected:
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/// Implementation of QIODevice::readData().
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virtual qint64 readData(char *data, qint64 maxSize);
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/// Implementation of QIODevice::writeData().
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virtual qint64 writeData(const char *data, qint64 maxSize);
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private:
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QuaZIODevicePrivate *d;
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};
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#endif // QUAZIP_QUAZIODEVICE_H
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