+/*
+ * from git:tag.h
+ */
+
+extern const char *tag_type;
+
+struct tag {
+ struct object object;
+ struct object *tagged;
+ char *tag;
+ char *signature; /* not actually implemented */
+};
+
+extern struct tag *lookup_tag(const unsigned char *sha1);
+extern int parse_tag_buffer(struct tag *item, void *data, unsigned long size);
+extern int parse_tag(struct tag *item);
+extern struct object *deref_tag(struct object *, const char *, int);
+
+
+/*
+ * from git:diffcore.h
+ */
+
+struct diff_filespec {
+ unsigned char sha1[20];
+ char *path;
+ void *data;
+ void *cnt_data;
+ unsigned long size;
+ int xfrm_flags; /* for use by the xfrm */
+ unsigned short mode; /* file mode */
+ unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
+ * if false, use the name and read from
+ * the filesystem.
+ */
+#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
+ unsigned should_free : 1; /* data should be free()'ed */
+ unsigned should_munmap : 1; /* data should be munmap()'ed */
+};
+
+struct diff_filepair {
+ struct diff_filespec *one;
+ struct diff_filespec *two;
+ unsigned short int score;
+ char status; /* M C R N D U (see Documentation/diff-format.txt) */
+ unsigned source_stays : 1; /* all of R/C are copies */
+ unsigned broken_pair : 1;
+ unsigned renamed_pair : 1;
+};
+
+#define DIFF_PAIR_UNMERGED(p) \
+ (!DIFF_FILE_VALID((p)->one) && !DIFF_FILE_VALID((p)->two))
+
+#define DIFF_PAIR_RENAME(p) ((p)->renamed_pair)
+
+#define DIFF_PAIR_BROKEN(p) \
+ ( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
+ ((p)->broken_pair != 0) )
+
+#define DIFF_PAIR_TYPE_CHANGED(p) \
+ ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
+
+#define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
+
+extern void diff_free_filepair(struct diff_filepair *);
+
+extern int diff_unmodified_pair(struct diff_filepair *);
+
+struct diff_queue_struct {
+ struct diff_filepair **queue;
+ int alloc;
+ int nr;
+};
+