bug#52560 - ArrayIndexOutOfBoundsException: -2 on NPOIFSFileSystem.readBAT

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1237629 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/poifs/filesystem/NPOIFSFileSystem.java

@@ -369,7 +369,7 @@ public class NPOIFSFileSystem extends BlockStore
           
           for(int j=0; j<bigBlockSize.getXBATEntriesPerBlock(); j++) {
              int fatAt = xfat.getValueAt(j);
-             if(fatAt == POIFSConstants.UNUSED_BLOCK) break;
+             if(fatAt == POIFSConstants.UNUSED_BLOCK || fatAt == POIFSConstants.END_OF_CHAIN) break;
              readBAT(fatAt, loopDetector);
           }
        }