tdf#123476 filter: Also handle empty ODF

This builds on top of commit ada07f303e7cd1e39c73abe0741aefe7d9d73a57,
to allow 0-byte ODT, ODS etc.

Possible TODO would be somehow use default template for such empty files,
getting the template name using SfxObjectFactory::GetStandardTemplate.
That would enable using 0-byte ODF files as means to "create new document
at this location from default template" workflow.

Change-Id: I36e07b80f60c42aecdcc6a7357e5bdd18f62e4f7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/109989
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
(cherry picked from commit 2854362f429e476d4a1ab4759c6a1f1c04150280)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/110060
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

4 files changed, 24 insertions, 2 deletions

diff --git a/filter/qa/unit/data/empty.odp b/filter/qa/unit/data/empty.odp
new file mode 100644
index 000000000000..e69de29bb2d1
--- /dev/null
+++ b/filter/qa/unit/data/empty.odp
diff --git a/filter/qa/unit/data/empty.odt b/filter/qa/unit/data/empty.odt
new file mode 100644
index 000000000000..e69de29bb2d1
--- /dev/null
+++ b/filter/qa/unit/data/empty.odt
diff --git a/filter/qa/unit/textfilterdetect.cxx b/filter/qa/unit/textfilterdetect.cxx
index fb1ff1d2ac7e..56dccf8914b9 100644
--- a/filter/qa/unit/textfilterdetect.cxx
+++ b/filter/qa/unit/textfilterdetect.cxx
@@ -91,6 +91,26 @@ CPPUNIT_TEST_FIXTURE(TextFilterDetectTest, testEmptyFile)
     // Without the accompanying fix in place, this test would have failed, as it was opened in
     // Writer instead.
     CPPUNIT_ASSERT(xServiceInfo->supportsService("com.sun.star.presentation.PresentationDocument"));
+
+    getComponent()->dispose();
+
+    // Now also test ODT
+    aURL = m_directories.getURLFromSrc(DATA_DIRECTORY) + "empty.odt";
+    getComponent() = loadFromDesktop(aURL);
+    xServiceInfo.set(getComponent(), uno::UNO_QUERY);
+    CPPUNIT_ASSERT(xServiceInfo.is());
+    // Make sure it opens in Writer.
+    CPPUNIT_ASSERT(xServiceInfo->supportsService("com.sun.star.text.TextDocument"));
+    getComponent()->dispose();
+
+    // ... and ODP
+    aURL = m_directories.getURLFromSrc(DATA_DIRECTORY) + "empty.odp";
+    getComponent() = loadFromDesktop(aURL);
+    xServiceInfo.set(getComponent(), uno::UNO_QUERY);
+    CPPUNIT_ASSERT(xServiceInfo.is());
+    // Without the accompanying fix in place, this test would have failed, as it was opened in
+    // Writer instead.
+    CPPUNIT_ASSERT(xServiceInfo->supportsService("com.sun.star.presentation.PresentationDocument"));
 }
 }
 
diff --git a/sfx2/source/doc/objstor.cxx b/sfx2/source/doc/objstor.cxx
index d5803e1b0029..4188ec2a7ef2 100644
--- a/sfx2/source/doc/objstor.cxx
+++ b/sfx2/source/doc/objstor.cxx
@@ -424,7 +424,7 @@ bool SfxObjectShell::InitNew( const uno::Reference< embed::XStorage >& xStorage
 
 bool SfxObjectShell::Load( SfxMedium& rMedium )
 {
-    return GeneralInit_Impl( rMedium.GetStorage(), true );
+    return GeneralInit_Impl(rMedium.GetStorage(), !tools::isEmptyFileUrl(rMedium.GetName()));
 }
 
 void SfxObjectShell::DoInitUnitTest()
@@ -660,7 +660,9 @@ bool SfxObjectShell::DoLoad( SfxMedium *pMed )
                     bWarnMediaTypeFallback = false;
                 }
 
-                if ( bWarnMediaTypeFallback || !xStorage->getElementNames().hasElements() )
+                if (bWarnMediaTypeFallback
+                    || (!tools::isEmptyFileUrl(pMedium->GetName())
+                        && !xStorage->getElementNames().hasElements()))
                     SetError(ERRCODE_IO_BROKENPACKAGE);
             }
             catch( uno::Exception& )