add diff and patch functions for xdelta3

utils/xdelta3.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2014 Johannes Schauer <j.schauer@email.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2, as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ */
+
+#ifndef _MFSHELL_XDELTA3_H_
+#define _MFSHELL_XDELTA3_H_
+
+#include <stdio.h>
+
+int xdelta3_diff(FILE *old, FILE *new, FILE *diff);
+int xdelta3_patch(FILE *old, FILE *diff, FILE *new);
+
+#endif