106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
/*************************************************************************
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* Copyright (C) 2008 by Volker Lanz <vl@fidra.de> *
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* Copyright (C) 2016 by Andrius Štikonas <andrius@stikonas.eu> *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License as *
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* published by the Free Software Foundation; either version 3 of *
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* the License, or (at your option) any later version. *
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* *
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* This program 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 General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>.*
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*************************************************************************/
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#include "core/copysourcedevice.h"
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#include "backend/corebackend.h"
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#include "backend/corebackendmanager.h"
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#include "backend/corebackenddevice.h"
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#include "core/copytarget.h"
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#include "core/copytargetdevice.h"
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#include "core/device.h"
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/** Constructs a CopySource on the given Device
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@param d Device from which to copy
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@param firstbyte the first byte that will be copied
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@param lastbyte the last byte that will be copied
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*/
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CopySourceDevice::CopySourceDevice(Device& d, qint64 firstbyte, qint64 lastbyte) :
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CopySource(),
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m_Device(d),
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m_FirstByte(firstbyte),
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m_LastByte(lastbyte),
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m_BackendDevice(nullptr)
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{
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}
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/** Destructs a CopySourceDevice */
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CopySourceDevice::~CopySourceDevice()
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{
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delete m_BackendDevice;
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}
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/** Opens the Device
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@return true if the Device could be successfully opened
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*/
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bool CopySourceDevice::open()
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{
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m_BackendDevice = CoreBackendManager::self()->backend()->openDeviceExclusive(device().deviceNode());
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return m_BackendDevice != nullptr;
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}
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/** Returns the length of this CopySource
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@return length of the copy source
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*/
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qint64 CopySourceDevice::length() const
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{
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return lastByte() - firstByte() + 1;
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}
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/** Reads a given number of bytes from the Device into the given buffer.
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Note that @p readOffset must be greater or equal than zero.
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@param buffer the buffer to store the read bytes in
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@param readOffset the offset to begin reading
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@param size the number of bytes to read
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@return true if successful
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*/
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bool CopySourceDevice::readData(QByteArray& buffer, qint64 readOffset, qint64 size)
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{
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Q_ASSERT(readOffset >= 0);
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return m_BackendDevice->readData(buffer, readOffset, size);
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}
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/** Checks if this CopySourceDevice overlaps with the given CopyTarget
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@param target the CopyTarget to check overlapping with
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@return true if overlaps
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*/
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bool CopySourceDevice::overlaps(const CopyTarget& target) const
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{
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try {
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const CopyTargetDevice& t = dynamic_cast<const CopyTargetDevice&>(target);
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if (device().deviceNode() != t.device().deviceNode())
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return false;
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// overlapping at the front?
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if (firstByte() <= t.firstByte() && lastByte() >= t.firstByte())
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return true;
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// overlapping at the back?
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if (firstByte() <= t.lastByte() && lastByte() >= t.lastByte())
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return true;
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} catch (...) {
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}
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return false;
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}
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