tree/diff header cleanup.

Introduce tree-walk.[ch] and move "struct tree_desc" and
associated functions from various places.

Rename DIFF_FILE_CANON_MODE(mode) macro to canon_mode(mode) and
move it to cache.h.  This macro returns the canonicalized
st_mode value in the host byte order for files, symlinks and
directories -- to be compared with a tree_desc entry.
create_ce_mode(mode) in cache.h is similar but is intended to be
used for index entries (so it does not work for directories) and
returns the value in the network byte order.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 25 insertions, 0 deletions

diff --git a/tree-walk.h b/tree-walk.h
new file mode 100644
index 0000000000..76893e36c3
--- /dev/null
+++ b/tree-walk.h
@@ -0,0 +1,25 @@
+#ifndef TREE_WALK_H
+#define TREE_WALK_H
+
+struct tree_desc {
+	void *buf;
+	unsigned long size;
+};
+
+struct name_entry {
+	const unsigned char *sha1;
+	const char *path;
+	unsigned int mode;
+	int pathlen;
+};
+
+void update_tree_entry(struct tree_desc *);
+const unsigned char *tree_entry_extract(struct tree_desc *, const char **, unsigned int *);
+
+void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1);
+
+typedef void (*traverse_callback_t)(int n, unsigned long mask, struct name_entry *entry, const char *base);
+
+void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callback_t callback);
+
+#endif