tdf#100084 XLSX import: fix missing charts

caused by case-sensitive path handling of relationship files.

OOXML documents contain case-insensitive file paths, for example,
uppercase "Sheet.xml" can have a lowercase "sheet.xml.rels" in the ZIP
archive, as in the case of the XLSX documents generated by IBM Cognos.

Change-Id: I4210e3b96fb512d61e1687ec8d41a3c77292ec0c
Reviewed-on: https://gerrit.libreoffice.org/72100
Tested-by: Jenkins
Reviewed-by: László Németh <nemeth@numbertext.org>

chart2/qa/extras/chart2import.cxx

@@ -70,6 +70,7 @@ public:
     void testTdf105517();
     void testTdf106217();
     void testTdf108021();
+    void testTdf100084();
     void testAutoBackgroundXLSX();
     void testAutoChartAreaBorderPropXLSX();
     void testChartAreaStyleBackgroundXLSX();
@@ -158,6 +159,7 @@ public:
     CPPUNIT_TEST(testTdf105517);
     CPPUNIT_TEST(testTdf106217);
     CPPUNIT_TEST(testTdf108021);
+    CPPUNIT_TEST(testTdf100084);
     CPPUNIT_TEST(testAutoBackgroundXLSX);
     CPPUNIT_TEST(testAutoChartAreaBorderPropXLSX);
     CPPUNIT_TEST(testChartAreaStyleBackgroundXLSX);
@@ -883,6 +885,16 @@ void Chart2ImportTest::testTdf108021()
     CPPUNIT_ASSERT(bTextBreak);
 }
 
+void Chart2ImportTest::testTdf100084()
+{
+    // The test file was created with IBM Cognos, so just check there is a diagram.
+    load("/chart2/qa/extras/data/xlsx/", "tdf100084.xlsx");
+    Reference<chart2::XChartDocument> xChartDoc = getChartDocFromSheet(0, mxComponent);
+    CPPUNIT_ASSERT_MESSAGE("failed to load chart", xChartDoc.is());
+    Reference<beans::XPropertySet> xDiagram(xChartDoc->getFirstDiagram(), UNO_QUERY);
+    CPPUNIT_ASSERT_MESSAGE("There should be a Diagram.", xDiagram.is());
+}
+
 void Chart2ImportTest::testTransparentBackground(OUString const & filename)
 {
     load("/chart2/qa/extras/data/xlsx/", filename);

oox/source/core/xmlfilterbase.cxx

@@ -342,7 +342,7 @@ bool XmlFilterBase::importFragment( const rtl::Reference<FragmentHandler>& rxHan
         return false;
 
     // fragment handler must contain path to fragment stream
-    const OUString aFragmentPath = rxHandler->getFragmentPath();
+    OUString aFragmentPath = rxHandler->getFragmentPath();
     OSL_ENSURE( !aFragmentPath.isEmpty(), "XmlFilterBase::importFragment - missing fragment path" );
     if( aFragmentPath.isEmpty() )
         return false;
@@ -385,6 +385,18 @@ bool XmlFilterBase::importFragment( const rtl::Reference<FragmentHandler>& rxHan
             handler to create specialized input streams, e.g. VML streams that
             have to preprocess the raw input data. */
         Reference< XInputStream > xInStrm = rxHandler->openFragmentStream();
+        // Check again the aFragmentPath route if there is no any file with lowercase letter. (tdf#100084)
+        if ( !xInStrm.is() )
+        {
+            sal_Int32 nPathLen = aFragmentPath.lastIndexOf('/') + 1;
+            OUString fileName = aFragmentPath.copy(nPathLen);
+            if ( fileName != fileName.toAsciiLowerCase() )
+            {
+                fileName = fileName.toAsciiLowerCase();
+                aFragmentPath = OUStringBuffer(aFragmentPath.copy(0, nPathLen)).append(fileName).makeStringAndClear();
+                xInStrm = openInputStream(aFragmentPath);
+            }
+        }
 
         // own try/catch block for showing parser failure assertion with fragment path
         if( xInStrm.is() ) try