1 files changed, 67 insertions, 0 deletions
diff --git a/tools/source/stream/vcompat.cxx b/tools/source/stream/vcompat.cxx
new file mode 100644
index 000000000..d77f866e0
--- /dev/null
+++ b/tools/source/stream/vcompat.cxx
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <tools/stream.hxx>
+#include <tools/vcompat.hxx>
+
+VersionCompat::VersionCompat( SvStream& rStm, StreamMode nStreamMode, sal_uInt16 nVersion ) :
+            mpRWStm     ( &rStm ),
+            mnCompatPos ( 0 ),
+            mnTotalSize ( 0 ),
+            mnStmMode   ( nStreamMode ),
+            mnVersion   ( nVersion )
+{
+    if( !mpRWStm->GetError() )
+    {
+        if( StreamMode::WRITE == mnStmMode )
+        {
+            mpRWStm->WriteUInt16( mnVersion );
+            mnCompatPos = mpRWStm->Tell();
+            mnTotalSize = mnCompatPos + 4;
+            mpRWStm->SeekRel( 4 );
+        }
+        else
+        {
+            mpRWStm->ReadUInt16( mnVersion );
+            mpRWStm->ReadUInt32( mnTotalSize );
+            mnCompatPos = mpRWStm->Tell();
+        }
+    }
+}
+
+VersionCompat::~VersionCompat()
+{
+    if( StreamMode::WRITE == mnStmMode )
+    {
+        const sal_uInt32 nEndPos = mpRWStm->Tell();
+
+        mpRWStm->Seek( mnCompatPos );
+        mpRWStm->WriteUInt32(  nEndPos - mnTotalSize  );
+        mpRWStm->Seek( nEndPos );
+    }
+    else
+    {
+        const sal_uInt32 nReadSize = mpRWStm->Tell() - mnCompatPos;
+
+        if( mnTotalSize > nReadSize )
+            mpRWStm->SeekRel( mnTotalSize - nReadSize );
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */