diff -r 6d0add6ad778 -r 23505e6ea22d src/share/classes/com/sun/tools/classfile/Attributes.java
--- a/src/share/classes/com/sun/tools/classfile/Attributes.java	Thu Jul 30 10:30:34 2009 +0100
+++ b/src/share/classes/com/sun/tools/classfile/Attributes.java	Thu Jul 30 07:48:24 2009 -0700
@@ -95,6 +95,13 @@
         return attrs.length;
     }
 
+    public int byteLength() {
+        int length = 2;
+        for (Attribute a: attrs)
+            length += a.byteLength();
+        return length;
+    }
+
     public final Attribute[] attrs;
     public final Map<String, Attribute> map;
 }