--- a/mpffs/common.c	Mon Jul 01 06:28:30 2013 +0000
+++ b/mpffs/common.c	Mon Jul 01 06:49:50 2013 +0000
@@ -335,6 +335,39 @@
 	chi->len = chi->end - chi->start;
 }
 
+iterate_extra_chunks(first_extra_chunk, callback, callback_data)
+	void (*callback)();
+	u_long callback_data;
+{
+	int ent;
+	struct objinfo obj;
+
+	for (ent = first_extra_chunk; ent != 0xFFFF; ent = obj.descend) {
+loop:		obj.entryno = ent;
+		get_index_entry(&obj);
+		switch (obj.type) {
+		case 0xF4:
+			validate_chunk(&obj);
+			callback(&obj, callback_data);
+			continue;
+		case 0x00:
+			if (obj.sibling == 0xFFFF) {
+				fprintf(stderr,
+"file continuation object at index %x: marked deleted, but no sibling\n",
+					ent);
+				exit(1);
+			}
+			ent = obj.sibling;
+			goto loop;
+		default:
+			fprintf(stderr,
+		"file continuation object at index %x: unexpected type %02X\n",
+				ent, obj.type);
+			exit(1);
+		}
+	}
+}
+
 find_root_node()
 {
 	struct objinfo obj;