+extern void diff_change(unsigned mode1, unsigned mode2,
+ const unsigned char *sha1,
+ const unsigned char *sha2,
+ const char *base, const char *path);
+
+extern void diff_helper_input(unsigned mode1,
+ unsigned mode2,
+ const unsigned char *sha1,
+ const unsigned char *sha2,
+ const char *path1,
+ int status,
+ int score,
+ const char *path2);
+
+extern void diff_unmerge(const char *path);
+
+extern int diff_scoreopt_parse(const char *opt);
+
+#define DIFF_SETUP_REVERSE 1
+#define DIFF_SETUP_USE_CACHE 2
+#define DIFF_SETUP_USE_SIZE_CACHE 4
+
+extern void diff_setup(int flags);
+
+#define DIFF_DETECT_RENAME 1
+#define DIFF_DETECT_COPY 2
+
+#define DIFF_PICKAXE_ALL 1
+
+extern void diffcore_std(const char **paths,
+ int detect_rename, int rename_score,
+ const char *pickaxe, int pickaxe_opts,
+ int break_opt,
+ const char *orderfile, const char *filter);
+
+extern void diffcore_std_no_resolve(const char **paths,
+ const char *pickaxe, int pickaxe_opts,
+ const char *orderfile, const char *filter);
+
+extern int diff_queue_is_empty(void);
+
+#define DIFF_FORMAT_HUMAN 0
+#define DIFF_FORMAT_MACHINE 1
+#define DIFF_FORMAT_PATCH 2
+#define DIFF_FORMAT_NO_OUTPUT 3
+
+extern void diff_flush(int output_style);