1 files changed, 68 insertions, 0 deletions
diff --git a/tools/source/stream/vcompat.cxx b/tools/source/stream/vcompat.cxx
new file mode 100644
index 000000000..bf85c0c9a
--- /dev/null
+++ b/tools/source/stream/vcompat.cxx
@@ -0,0 +1,68 @@
+/* -*- 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>
+
+VersionCompatRead::VersionCompatRead(SvStream& rStm)
+    : mrRStm(rStm)
+    , mnCompatPos(0)
+    , mnTotalSize(0)
+    , mnVersion(1)
+{
+    if (mrRStm.GetError())
+        return;
+
+    mrRStm.ReadUInt16(mnVersion);
+    mrRStm.ReadUInt32(mnTotalSize);
+    mnCompatPos = mrRStm.Tell();
+}
+
+VersionCompatWrite::VersionCompatWrite(SvStream& rStm, sal_uInt16 nVersion)
+    : mrWStm(rStm)
+    , mnCompatPos(0)
+    , mnTotalSize(0)
+{
+    if (mrWStm.GetError())
+        return;
+
+    mrWStm.WriteUInt16(nVersion);
+    mnCompatPos = mrWStm.Tell();
+    mnTotalSize = mnCompatPos + 4;
+    mrWStm.SeekRel(4);
+}
+
+VersionCompatRead::~VersionCompatRead()
+{
+    const sal_uInt32 nReadSize = mrRStm.Tell() - mnCompatPos;
+
+    if (mnTotalSize > nReadSize)
+        mrRStm.SeekRel(mnTotalSize - nReadSize);
+}
+
+VersionCompatWrite::~VersionCompatWrite()
+{
+    const sal_uInt32 nEndPos = mrWStm.Tell();
+
+    mrWStm.Seek(mnCompatPos);
+    mrWStm.WriteUInt32(nEndPos - mnTotalSize);
+    mrWStm.Seek(nEndPos);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */