Patch from thaichat04 from bug #56194 - HPSF thumbnail format tags are int not unit

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1613256 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hpsf/Thumbnail.java

      */
     public long getClipboardFormatTag()
     {
-        long clipboardFormatTag = LittleEndian.getUInt(getThumbnail(),
+        long clipboardFormatTag = LittleEndian.getInt(getThumbnail(),
                                                        OFFSET_CFTAG);
         return clipboardFormatTag;
     }
             throw new HPSFException("Clipboard Format Tag of Thumbnail must " +
                                     "be CFTAG_WINDOWS.");
 
-        return LittleEndian.getUInt(getThumbnail(), OFFSET_CF);
+        return LittleEndian.getInt(getThumbnail(), OFFSET_CF);
     }
 
 

src/testcases/org/apache/poi/hpsf/extractor/TestHPSFPropertiesExtractor.java

 import junit.framework.TestCase;
 
 import org.apache.poi.POIDataSamples;
+import org.apache.poi.hpsf.Thumbnail;
 import org.apache.poi.hssf.HSSFTestDataSamples;
 import org.apache.poi.hssf.extractor.ExcelExtractor;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 		assertTrue(txt.indexOf("PID_REVNUMBER") != -1);
 		assertTrue(txt.indexOf("PID_THUMBNAIL") != -1);
 	}
+	
+    public void testThumbnail() throws Exception {
+        POIFSFileSystem fs = new POIFSFileSystem(_samples.openResourceAsStream("TestThumbnail.xls"));
+        HSSFWorkbook wb = new HSSFWorkbook(fs);
+        Thumbnail thumbnail = new Thumbnail(wb.getSummaryInformation().getThumbnail());
+        assertEquals(-1, thumbnail.getClipboardFormatTag());
+        assertEquals(3, thumbnail.getClipboardFormat());
+        assertNotNull(thumbnail.getThumbnailAsWMF());
+        wb.close();
+    }
 }