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/**************************************************************************
**
** This file is part of Qt SDK**
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).*
**
** Contact: Nokia Corporation qt-info@nokia.com**
**
** No Commercial Usage
**
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception version
** 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you are unsure which license is appropriate for your use, please contact
** (qt-info@nokia.com).
**
**************************************************************************/
#include "kdmmappedfileiodevice.h"
#include <cassert>
#include <QFile>
KDMMappedFileIODevice::KDMMappedFileIODevice( QFile* file, qint64 offset, qint64 length, QObject* parent )
: QIODevice( parent )
, m_file( file )
, m_ownsFile( false )
, m_offset( offset )
, m_length( length )
, m_data( 0 ) {
assert( m_file );
}
KDMMappedFileIODevice::KDMMappedFileIODevice( const QString& filename, qint64 offset, qint64 length, QObject* parent )
: QIODevice( parent )
, m_file( new QFile( filename ) )
, m_ownsFile( true )
, m_offset( offset )
, m_length( length )
, m_data( 0 ) {
if ( !open( QIODevice::ReadOnly ) )
assert( !"Could not open device" );
}
KDMMappedFileIODevice::~KDMMappedFileIODevice() {
assert( m_file );
if ( m_ownsFile )
delete m_file;
}
qint64 KDMMappedFileIODevice::readData( char* data, qint64 maxSize ) {
ensureMapped();
if ( maxSize < 0 )
return 0;
const qint64 actual = std::min( maxSize, m_length - pos() );
memcpy( data, m_data + pos(), actual );
return actual;
}
qint64 KDMMappedFileIODevice::writeData( const char* data, qint64 maxSize ) {
Q_UNUSED( data )
Q_UNUSED( maxSize )
ensureMapped();
assert( !"not implemented" );
return -1;
}
bool KDMMappedFileIODevice::ensureMapped() {
if ( m_data )
return true;
assert( m_file );
m_data = m_file->map( m_offset, m_length );
return m_data != false;
}
bool KDMMappedFileIODevice::open( QIODevice::OpenMode openMode ) {
if ( openMode != QIODevice::ReadOnly )
qWarning( "%s: Write not supported\n", Q_FUNC_INFO );
if ( openMode == QIODevice::WriteOnly )
return false;
const bool opened = m_file->open( openMode );
if ( opened )
setOpenMode( openMode );
return opened;
}
void KDMMappedFileIODevice::close() {
if ( m_data )
m_file->unmap( m_data );
m_data = 0;
m_file->close();
}
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