diff --git a/libisofs/libisofs.h b/libisofs/libisofs.h
index 8d187ea..b3907ce 100644
--- a/libisofs/libisofs.h
+++ b/libisofs/libisofs.h
@@ -2232,7 +2232,7 @@ void el_torito_set_load_size(ElToritoBootImage *bootimg, short sectors);
 void el_torito_set_no_bootable(ElToritoBootImage *bootimg);
 
 /**
- * Specifies that this image needs to be patched. This involves the writting
+ * Specifies that this image needs to be patched. This involves the writing
  * of a 56 bytes boot information table at offset 8 of the boot image file.
  * The original boot image file won't be modified.
  * This is needed for isolinux boot images.
@@ -2512,6 +2512,23 @@ time_t iso_node_get_ctime(const IsoNode *node);
  */
 void iso_node_set_hidden(IsoNode *node, int hide_attrs);
 
+/* ts A90516 */
+/**
+ * Compare two nodes whether they are based on the same input and
+ * can be considered as hardlinks to the same file objects.
+ *
+ * @param n1
+ *     The first node to compare.
+ * @param n2
+ *     The second node to compare.
+ * @return
+ *     -1 if s1 is smaller s2 , 0 if s1 matches s2 , 1 if s1 is larger s2
+ * @param flag
+ *     Bitfield for control purposes, unused yet, submit 0
+ * @since 0.6.20
+ */
+int iso_node_cmp_ino(IsoNode *n1, IsoNode *n2, int flag);
+
 /**
  * Add a new node to a dir. Note that this function don't add a new ref to
  * the node, so you don't need to free it, it will be automatically freed
diff --git a/libisofs/node.c b/libisofs/node.c
index 549ad74..2444740 100644
--- a/libisofs/node.c
+++ b/libisofs/node.c
@@ -2313,6 +2313,7 @@ int iso_node_get_id(IsoNode *node, unsigned int *fs_id, dev_t *dev_id,
         *fs_id = symlink->fs_id;
         *dev_id = symlink->st_dev;
         *ino_id = symlink->st_ino;
+        return 1;
 
     } else if (node->type == LIBISO_SPECIAL) {
         special = (IsoSpecial *) node;
@@ -2323,12 +2324,12 @@ int iso_node_get_id(IsoNode *node, unsigned int *fs_id, dev_t *dev_id,
         *fs_id = special->fs_id;
         *dev_id = special->st_dev;
         *ino_id = special->st_ino;
+        return 1;
 
 #endif
 
     }
 
-
     ret = 0;
 no_id:;
     *fs_id = 0;
@@ -2515,10 +2516,14 @@ inode_match:;
     if (!(flag & 1))
         return 0;
     if (n1->type == LIBISO_SYMLINK) {
+        l1 = (IsoSymlink *) n1;
+        l2 = (IsoSymlink *) n2;
         ret1 = strcmp(l1->dest, l2->dest);
         if (ret1)
             return ret1;
     } else if (n1->type == LIBISO_SPECIAL) {
+        s1 = (IsoSpecial *) n1;
+        s2 = (IsoSpecial *) n2;
         if (s1->dev != s2->dev)
             return (s1->dev < s2->dev ? -1 : 1);
     }
@@ -2557,3 +2562,9 @@ inode_match:;
     return 0;
 }
 
+/* ts A90516 */
+/* API */
+int iso_node_cmp_ino(IsoNode *n1, IsoNode *n2, int flag)
+{
+    return iso_node_cmp_flag(n1, n2, 1 | 2);
+}