sw XHTML export: improve dummy OLE object handling

It is possible that we not only have a dummy OLE object, but both the
replacement image and the native data is missing. Handle these enough so
that we don't give up exporting the document and also produce valid
output.

Change-Id: Ia973ecfbfb7e8fdecdc831b29d3a82c988ed7ea5
Reviewed-on: https://gerrit.libreoffice.org/59806Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins

sw/qa/extras/htmlexport/htmlexport.cxx

@@ -35,6 +35,20 @@ public:
         m_eUnit(FUNIT_NONE)
     {}
 
+    /**
+     * Wraps a reqif-xhtml fragment into an XHTML file, so an XML parser can
+     * parse it.
+     */
+    void wrapFragment(SvMemoryStream& rStream)
+    {
+        rStream.WriteCharPtr(
+            "<reqif-xhtml:html xmlns:reqif-xhtml=\"http://www.w3.org/1999/xhtml\">\n");
+        SvFileStream aFileStream(maTempFile.GetURL(), StreamMode::READ);
+        rStream.WriteStream(aFileStream);
+        rStream.WriteCharPtr("</reqif-xhtml:html>\n");
+        rStream.Seek(0);
+    }
+
 private:
     bool mustCalcLayoutOf(const char* filename) override
     {
@@ -603,11 +617,7 @@ DECLARE_HTMLEXPORT_TEST(testTransparentImage, "transparent-image.odt")
 DECLARE_HTMLEXPORT_TEST(testTransparentImageReqIf, "transparent-image.odt")
 {
     SvMemoryStream aStream;
-    aStream.WriteCharPtr("<reqif-xhtml:html xmlns:reqif-xhtml=\"http://www.w3.org/1999/xhtml\">\n");
-    SvFileStream aFileStream(maTempFile.GetURL(), StreamMode::READ);
-    aStream.WriteStream(aFileStream);
-    aStream.WriteCharPtr("</reqif-xhtml:html>\n");
-    aStream.Seek(0);
+    wrapFragment(aStream);
     xmlDocPtr pDoc = parseXmlStream(&aStream);
     CPPUNIT_ASSERT(pDoc);
 
@@ -620,6 +630,22 @@ DECLARE_HTMLEXPORT_TEST(testTransparentImageReqIf, "transparent-image.odt")
     CPPUNIT_ASSERT_MESSAGE(aMessage.toUtf8().getStr(), aSource.endsWith(".png"));
 }
 
+DECLARE_HTMLEXPORT_TEST(testOleNodataReqIf, "reqif-ole-nodata.odt")
+{
+    // This failed, io::IOException was thrown during the filter() call.
+    SvMemoryStream aStream;
+    wrapFragment(aStream);
+    xmlDocPtr pDoc = parseXmlStream(&aStream);
+    CPPUNIT_ASSERT(pDoc);
+
+    // Make sure the native <object> element has the required data attribute.
+    OUString aSource = getXPath(
+        pDoc,
+        "/reqif-xhtml:html/reqif-xhtml:div/reqif-xhtml:p/reqif-xhtml:object/reqif-xhtml:object",
+        "data");
+    CPPUNIT_ASSERT(!aSource.isEmpty());
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

sw/source/filter/html/htmlplug.cxx

@@ -63,6 +63,7 @@
 #include <com/sun/star/frame/XStorable.hpp>
 #include <com/sun/star/embed/ElementModes.hpp>
 #include <com/sun/star/io/XActiveDataStreamer.hpp>
+#include <com/sun/star/io/IOException.hpp>
 #include <com/sun/star/embed/XEmbedPersist2.hpp>
 
 #include <comphelper/embeddedobjectcontainer.hxx>
@@ -74,6 +75,7 @@
 #include <comphelper/propertysequence.hxx>
 #include <filter/msfilter/msoleexp.hxx>
 #include <comphelper/fileurl.hxx>
+#include <osl/file.hxx>
 
 using namespace com::sun::star;
 
@@ -130,6 +132,33 @@ const HtmlFrmOpts HTML_FRMOPTS_OLE_CSS1       =
     HtmlFrmOpts::SAlign |
     HtmlFrmOpts::SSpace;
 
+namespace
+{
+/**
+ * Calculates a filename for an image, provided the HTML file name, the image
+ * itself and a wanted extension.
+ */
+OUString lcl_CalculateFileName(const OUString* pOrigFileName, const Graphic& rGraphic,
+                               const OUString& rExtension)
+{
+    OUString aFileName;
+
+    if (pOrigFileName)
+        aFileName = *pOrigFileName;
+    INetURLObject aURL(aFileName);
+    OUString aName(aURL.getBase());
+    aName += "_";
+    aName += aURL.getExtension();
+    aName += "_";
+    aName += OUString::number(rGraphic.GetChecksum(), 16);
+    aURL.setBase(aName);
+    aURL.setExtension(rExtension);
+    aFileName = aURL.GetMainURL(INetURLObject::DecodeMechanism::NONE);
+
+    return aFileName;
+}
+}
+
 void SwHTMLParser::SetFixSize( const Size& rPixSize,
                                const Size& rTwipDfltSize,
                                bool bPrcWidth, bool bPrcHeight,
@@ -1465,18 +1494,7 @@ Writer& OutHTML_FrameFormatOLENodeGrf( Writer& rWrt, const SwFrameFormat& rFrame
 
         // Calculate the file name, which is meant to be the same as the
         // replacement image, just with a .ole extension.
-        OUString aFileName;
-        if (rHTMLWrt.GetOrigFileName())
-            aFileName = *rHTMLWrt.GetOrigFileName();
-        INetURLObject aURL(aFileName);
-        OUString aName(aURL.getBase());
-        aName += "_";
-        aName += aURL.getExtension();
-        aName += "_";
-        aName += OUString::number(aGraphic.GetChecksum(), 16);
-        aURL.setBase(aName);
-        aURL.setExtension("ole");
-        aFileName = aURL.GetMainURL(INetURLObject::DecodeMechanism::NONE);
+        OUString aFileName = lcl_CalculateFileName(rHTMLWrt.GetOrigFileName(), aGraphic, "ole");
 
         // Write the data.
         SwOLEObj& rOLEObj = pOLENd->GetOLEObj();
@@ -1527,11 +1545,22 @@ Writer& OutHTML_FrameFormatOLENodeGrf( Writer& rWrt, const SwFrameFormat& rFrame
             // Otherwise the native data is just a grab-bag: ODummyEmbeddedObject.
             OUString aStreamName = rOLEObj.GetCurrentPersistName();
             uno::Reference<embed::XStorage> xStorage = pDocSh->GetStorage();
-            uno::Reference<io::XStream> xInStream
-                = xStorage->openStreamElement(aStreamName, embed::ElementModes::READ);
+            uno::Reference<io::XStream> xInStream;
+            try
+            {
+                // Even the native data may be missing.
+                xInStream = xStorage->openStreamElement(aStreamName, embed::ElementModes::READ);
+            } catch (const uno::Exception& rException)
+            {
+                SAL_WARN("sw.html", "OutHTML_FrameFormatOLENodeGrf: failed to open stream element: " << rException);
+            }
+            if (xInStream.is())
+            {
                 uno::Reference<io::XStream> xOutStream(new utl::OStreamWrapper(aOutStream));
                 comphelper::OStorageHelper::CopyInputToOutput(xInStream->getInputStream(),
                                                               xOutStream->getOutputStream());
+            }
+
             uno::Reference<beans::XPropertySet> xOutStreamProps(xInStream, uno::UNO_QUERY);
             if (xOutStreamProps.is())
                 xOutStreamProps->getPropertyValue("MediaType") >>= aFileType;
@@ -1566,6 +1595,15 @@ Writer& OutHTML_FrameFormatOLENodeGrf( Writer& rWrt, const SwFrameFormat& rFrame
             aFilterName = "PNG";
             nFlags = XOutFlags::NONE;
             aMimeType = "image/png";
+
+            if (aGraphic.GetType() == GraphicType::NONE)
+            {
+                // The OLE Object has no replacement image, write a stub.
+                aGraphicURL = lcl_CalculateFileName(rHTMLWrt.GetOrigFileName(), aGraphic, "png");
+                osl::File aFile(aGraphicURL);
+                aFile.open(osl_File_OpenFlag_Create);
+                aFile.close();
+            }
         }
 
         ErrCode nErr = XOutBitmap::WriteGraphic( aGraphic, aGraphicURL,