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/***************************************************************************
* Copyright (C) 2016 by Ilya Kotov *
* forkotov02@hotmail.ru *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include "archiveinputdevice.h"
ArchiveInputDevice::ArchiveInputDevice(archive *a, archive_entry *e, QObject *parent) : QIODevice(parent)
{
m_archive = a;
m_entry = e;
open(QIODevice::ReadOnly);
m_buffer.open(QBuffer::ReadWrite);
}
bool ArchiveInputDevice::seek(qint64 pos)
{
QIODevice::seek(pos);
if(pos > m_buffer.size())
{
char tmp[1024];
qint64 delta = pos - m_buffer.size();
while (delta > 0)
{
qint64 r = qMin(qint64(sizeof(tmp)), delta);
r = archive_read_data(m_archive, tmp, r);
if(r > 0)
{
m_buffer.buffer().append(tmp, r);
delta -= r;
continue;
}
else if(r < 0)
{
qWarning("ArchiveInputDevice: seeking failed; libarchive error: %s", archive_error_string(m_archive));
}
return false;
}
}
return m_buffer.seek(pos);
}
qint64 ArchiveInputDevice::size() const
{
return archive_entry_size(m_entry);
}
qint64 ArchiveInputDevice::readData(char *data, qint64 maxSize)
{
if(m_buffer.pos() + maxSize > m_buffer.size())
{
qint64 l = m_buffer.pos() + maxSize - m_buffer.size();
char tmp[l];
int r = archive_read_data(m_archive, tmp, l);
if(r > 0)
m_buffer.buffer().append(tmp, r);
else if(r < 0)
qWarning("ArchiveInputDevice: reading failed; libarchive error: %s", archive_error_string(m_archive));
}
return m_buffer.read(data, maxSize);
}
qint64 ArchiveInputDevice::writeData(const char *, qint64)
{
return -1;
}
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