Handling of El-Torito boot catalog at low level.

src/filesrc.c

@@ -81,6 +81,38 @@ int iso_file_src_create(Ecma119Image *img, IsoFile *file, IsoFileSrc **src)
     return ISO_SUCCESS;
 }
 
+/**
+ * Add a given IsoFileSrc to the given image target.
+ * 
+ * The IsoFileSrc will be cached in a tree to prevent the same file for 
+ * being written several times to image. If you call again this function
+ * with a node that refers to the same source file, the previously
+ * created one will be returned.
+ * 
+ * @param img
+ *      The image where this file is to be written
+ * @param new
+ *      The IsoFileSrc to add
+ * @param src
+ *      Will be filled with a pointer to the IsoFileSrc really present in
+ *      the tree. It could be different than new if the same file already
+ *      exists in the tree. 
+ * @return
+ *      1 on success, 0 if file already exists on tree, < 0 error
+ */
+int iso_file_src_add(Ecma119Image *img, IsoFileSrc *new, IsoFileSrc **src)
+{
+    int ret;
+
+    if (img == NULL || new == NULL || src == NULL) {
+        return ISO_NULL_POINTER;
+    }
+    
+    /* insert the filesrc in the tree */
+    ret = iso_rbtree_insert(img->files, new, (void**)src);
+    return ret;
+}
+
 void iso_file_src_free(void *node)
 {
     free(node);