1 files changed, 108 insertions, 0 deletions
diff --git a/installerbuilder/libinstaller/kdmmappedfileiodevice.cpp b/installerbuilder/libinstaller/kdmmappedfileiodevice.cpp
new file mode 100644
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+++ b/installerbuilder/libinstaller/kdmmappedfileiodevice.cpp
@@ -0,0 +1,108 @@
+/**************************************************************************
+**
+** 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();
+}
+