sw: fix modification of ole obj native data during HTML import

It is expected that if you load an OLE2 storage (from reqif-xhtml) and
you save it as ODT, the OLE2 data is not modified. This was almost the
case, but we insisted on removing the OLE2 preview from the storage.

Add a new flag to OleEmbeddedObject, so import filters can opt in for
not modifying the OLE2 data.

[ The nice situation is that we already had a test file which had a
preview stream in the OLE2 storage, so we can easily assert there that
the size doesn't change. ]

Change-Id: I9b8b29f015dd4f2513e51a1066767218580cb5d8
Reviewed-on: https://gerrit.libreoffice.org/63381
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

3 files changed, 25 insertions, 2 deletions

diff --git a/embeddedobj/source/inc/oleembobj.hxx b/embeddedobj/source/inc/oleembobj.hxx
index b1f44fbbd429..d9b75d2a9836 100644
--- a/embeddedobj/source/inc/oleembobj.hxx
+++ b/embeddedobj/source/inc/oleembobj.hxx
@@ -37,6 +37,7 @@
 #include <com/sun/star/util/XCloseable.hpp>
 #include <com/sun/star/util/XCloseListener.hpp>
 #include <com/sun/star/io/XActiveDataStreamer.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
 #include <cppuhelper/implbase.hxx>
 #include <rtl/ref.hxx>
 
@@ -117,7 +118,8 @@ class OleEmbeddedObject : public ::cppu::WeakImplHelper
                         , css::embed::XLinkageSupport
                         , css::embed::XInplaceObject
                         , css::container::XChild
-                        , css::io::XActiveDataStreamer >
+                        , css::io::XActiveDataStreamer
+                        , css::lang::XInitialization >
 {
     friend class OleComponent;
 
@@ -205,6 +207,9 @@ class OleEmbeddedObject : public ::cppu::WeakImplHelper
 
     css::uno::Reference< css::uno::XInterface > m_xParent;
 
+    /// If it is allowed to modify entires in the stream of the OLE storage.
+    bool m_bStreamReadOnly = false;
+
 protected:
     /// @throws css::uno::Exception
     css::uno::Reference< css::io::XStream > TryToGetAcceptableFormat_Impl(
@@ -441,6 +446,9 @@ public:
     // XActiveDataStreamer
     void SAL_CALL setStream(const css::uno::Reference<css::io::XStream>& xStream) override;
     css::uno::Reference<css::io::XStream> SAL_CALL getStream() override;
+
+    // XInitialization
+    void SAL_CALL initialize(const css::uno::Sequence<css::uno::Any>& rArguments) override;
 };
 
 #endif
diff --git a/embeddedobj/source/msole/olemisc.cxx b/embeddedobj/source/msole/olemisc.cxx
index 83485c89d768..2d757a594533 100644
--- a/embeddedobj/source/msole/olemisc.cxx
+++ b/embeddedobj/source/msole/olemisc.cxx
@@ -29,6 +29,7 @@
 #include <com/sun/star/lang/DisposedException.hpp>
 
 #include <cppuhelper/interfacecontainer.h>
+#include <comphelper/sequenceashashmap.hxx>
 
 #include <oleembobj.hxx>
 #include "olepersist.hxx"
@@ -676,4 +677,17 @@ css::uno::Reference<css::io::XStream> OleEmbeddedObject::getStream()
     return m_xObjectStream;
 }
 
+void OleEmbeddedObject::initialize(const uno::Sequence<uno::Any>& rArguments)
+{
+    if (!rArguments.hasElements())
+        return;
+
+    comphelper::SequenceAsHashMap aValues(rArguments[0]);
+    for (const auto& rValue : aValues)
+    {
+        if (rValue.first == "StreamReadOnly")
+            rValue.second >>= m_bStreamReadOnly;
+    }
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/embeddedobj/source/msole/olepersist.cxx b/embeddedobj/source/msole/olepersist.cxx
index eedc8c4fe63b..df78e09291ce 100644
--- a/embeddedobj/source/msole/olepersist.cxx
+++ b/embeddedobj/source/msole/olepersist.cxx
@@ -1201,7 +1201,8 @@ void OleEmbeddedObject::StoreToLocation_Impl(
             if ( !xCachedVisualRepresentation.is() )
                 xCachedVisualRepresentation = TryToRetrieveCachedVisualRepresentation_Impl( xTargetStream );
 
-            RemoveVisualCache_Impl( xTargetStream );
+            if (!m_bStreamReadOnly)
+                RemoveVisualCache_Impl(xTargetStream);
         }
     }