fixed bug 51670: avoid LeftoverDataException when reading .xls files with invalid LabelRecord

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1169725 13f79535-47bb-0310-9956-ffa450edef68

src/documentation/content/xdocs/status.xml

 
     <changes>
         <release version="3.8-beta5" date="2011-??-??">
+           <action dev="poi-developers" type="add">51670 - avoid LeftoverDataException when reading .xls files with invalid LabelRecords</action>
            <action dev="poi-developers" type="add">51196 - prevent NPE in XWPFPicture.getPictureData() </action>
            <action dev="poi-developers" type="add">51771 - prevent NPE when getting object data from OLEShape in HSLF</action>
            <action dev="poi-developers" type="add">51196 - more progress with Chart APi in XSSF</action>

src/java/org/apache/poi/hssf/record/LabelRecord.java

 package org.apache.poi.hssf.record;
 
 import org.apache.poi.util.HexDump;
+import org.apache.poi.util.POILogFactory;
+import org.apache.poi.util.POILogger;
 
 /**
  * Label Record (0x0204) - read only support for strings stored directly in the cell..  Don't
  * @see org.apache.poi.hssf.record.LabelSSTRecord
  */
 public final class LabelRecord extends Record implements CellValueRecordInterface {
+    private final static POILogger logger = POILogFactory.getLogger(LabelRecord.class);
+
     public final static short sid = 0x0204;
 
     private int               field_1_row;
         } else {
             field_6_value = "";
         }
+
+        if (in.remaining() > 0) {
+           logger.log(POILogger.INFO,
+                   "LabelRecord data remains: " + in.remaining() +
+                           " : " + HexDump.toHex(in.readRemainder())
+           );
+        }
     }
 
 /*
      */
     public boolean isUnCompressedUnicode()
     {
-        return (field_5_unicode_flag == 1);
+        return (field_5_unicode_flag & 0x01) != 0;
     }
 
     /**

src/testcases/org/apache/poi/hssf/usermodel/TestBugs.java

           assertTrue(text.contains("Bottom Right Cell"));
        }
     }
+
+    public void test51670() {
+        HSSFWorkbook wb = openSample("51670.xls");
+        writeOutAndReadBack(wb);
+    }
+
 }