mirror of
https://bitbucket.org/smil3y/kdelibs.git
synced 2025-02-24 10:52:49 +00:00
80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
/* This file is part of the KDE libraries
|
|
Copyright (C) 2001, 2002, 2007 David Faure <faure@kde.org>
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public
|
|
License version 2 as published by the Free Software Foundation.
|
|
|
|
This library 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public License
|
|
along with this library; see the file COPYING.LIB. If not, write to
|
|
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "klimitediodevice_p.h"
|
|
|
|
KLimitedIODevice::KLimitedIODevice( QIODevice *dev, qint64 start, qint64 length )
|
|
: m_dev( dev ), m_start( start ), m_length( length )
|
|
{
|
|
//kDebug(7005) << "start=" << start << "length=" << length;
|
|
open( QIODevice::ReadOnly ); //krazy:exclude=syscalls
|
|
}
|
|
|
|
bool KLimitedIODevice::open( QIODevice::OpenMode m )
|
|
{
|
|
//kDebug(7005) << "m=" << m;
|
|
if ( m & QIODevice::ReadOnly ) {
|
|
/*bool ok = false;
|
|
if ( m_dev->isOpen() )
|
|
ok = ( m_dev->mode() == QIODevice::ReadOnly );
|
|
else
|
|
ok = m_dev->open( m );
|
|
if ( ok )*/
|
|
m_dev->seek( m_start ); // No concurrent access !
|
|
}
|
|
else
|
|
kWarning(7005) << "KLimitedIODevice::open only supports QIODevice::ReadOnly!";
|
|
setOpenMode( QIODevice::ReadOnly );
|
|
return true;
|
|
}
|
|
|
|
void KLimitedIODevice::close()
|
|
{
|
|
}
|
|
|
|
qint64 KLimitedIODevice::size() const
|
|
{
|
|
return m_length;
|
|
}
|
|
|
|
qint64 KLimitedIODevice::readData( char * data, qint64 maxlen )
|
|
{
|
|
maxlen = qMin( maxlen, m_length - pos() ); // Apply upper limit
|
|
return m_dev->read( data, maxlen );
|
|
}
|
|
|
|
bool KLimitedIODevice::seek( qint64 pos )
|
|
{
|
|
Q_ASSERT( pos <= m_length );
|
|
pos = qMin( pos, m_length ); // Apply upper limit
|
|
bool ret = m_dev->seek( m_start + pos );
|
|
if ( ret ) {
|
|
QIODevice::seek( pos );
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
qint64 KLimitedIODevice::bytesAvailable() const
|
|
{
|
|
return QIODevice::bytesAvailable();
|
|
}
|
|
|
|
bool KLimitedIODevice::isSequential() const
|
|
{
|
|
return m_dev->isSequential();
|
|
}
|