/usr/include/QHttpEngine/qiodevicecopier.h is in libqhttpengine-dev 0.1.0+dfsg1-1.
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* Copyright (c) 2015 Nathan Osman
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef QHTTPENGINE_QIODEVICECOPIER_H
#define QHTTPENGINE_QIODEVICECOPIER_H
#include <QIODevice>
#include <QObject>
#include "qhttpengine.h"
class QHTTPENGINE_EXPORT QIODeviceCopierPrivate;
/**
* @brief Data copier for classes deriving from QIODevice
* @headerfile qiodevicecopier.h QHttpEngine/QIODeviceCopier
*
* QIODeviceCopier provides a set of methods for reading data from a QIODevice
* and writing it to another. The class operates asynchronously and therefore
* can be used from the main thread. The copier is initialized with pointers
* to two QIODevices:
*
* @code
* QFile srcFile("src.txt");
* QFile destFile("dest.txt");
*
* QIODeviceCopier copier(&srcFile, &destFile);
* copier.start()
* @endcode
*
* Notice in the example above that it is not necessary to open the devices
* prior to starting the copy operation. The copier will attempt to open both
* devices with the appropriate mode if they are not already open.
*
* If the source device is sequential, data will be read as it becomes
* available and immediately written to the destination device. If the source
* device is not sequential, data will be read and written in blocks. The size
* of the blocks can be modified with the setBufferSize() method.
*
* If an error occurs, the error() signal will be emitted. When the copy
* completes, either by reading all of the data from the source device or
* encountering an error, the finished() signal is emitted.
*/
class QHTTPENGINE_EXPORT QIODeviceCopier : public QObject
{
Q_OBJECT
public:
/**
* @brief Create a new device copier from the specified source and destination devices
*/
QIODeviceCopier(QIODevice *src, QIODevice *dest, QObject *parent = 0);
/**
* @brief Set the size of the buffer
*/
void setBufferSize(qint64 size);
Q_SIGNALS:
/**
* @brief Indicate that an error occurred
*/
void error(const QString &message);
/**
* @brief Indicate that the copy operation finished
*
* For sequential devices, this will occur when readChannelFinished() is
* emitted. For other devices, this signal relies on QIODevice::atEnd()
* and QIODevice::aboutToClose().
*
* This signal will also be emitted immediately after the error() signal
* or if the stop() method is invoked.
*/
void finished();
public Q_SLOTS:
/**
* @brief Start the copy operation
*
* The source device will be opened for reading and the destination device
* opened for writing if applicable. If opening either file fails for some
* reason, the error() signal will be emitted.
*
* This method should never be invoked more than once.
*/
void start();
/**
* @brief Stop the copy operation
*
* The start() method should not be invoked after stopping the operation.
* Instead, a new QIODeviceCopier instance should be created.
*/
void stop();
private:
QIODeviceCopierPrivate *const d;
friend class QIODeviceCopierPrivate;
};
#endif // QHTTPENGINE_QIODEVICECOPIER_H
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