-extern int mtd_write_buffer(int fd, char *buf, int offset, int length);
-extern int mtd_write_jffs2(char *mtd, char *filename, char *dir);
+extern int mtd_write_buffer(int fd, const char *buf, int offset, int length);
+extern int mtd_write_jffs2(const char *mtd, const char *filename, const char *dir);
+extern int mtd_replace_jffs2(int fd, int ofs, const char *filename);
+extern void mtd_parse_jffs2data(const char *buf, const char *dir);