added a main method so we can use it as a quickie utility (been meaning to do that for years)

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git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@353651 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/util/HexDump.java

@@ -393,4 +393,13 @@ public class HexDump
         byte[] data = buf.toByteArray();
         dump(data, 0, out, start, data.length);
     }
+
+    public static void main(String[] args) throws Exception {
+        File file = new File(args[0]);
+        InputStream in = new BufferedInputStream(new FileInputStream(file)); 
+        byte[] b = new byte[(int)file.length()];
+        in.read(b);
+        System.out.println(HexDump.dump(b, 0, 0));
+        in.close();
+    }
 }