move read_mmfile() into xdiff-interface

diff --git a/tree-walk.h b/tree-walk.h
index 47438fe1c08a8e119fd08aea0eac612c76c21a66..e57befa4dac0854906d5b792ce546dab0e6dcdc3 100644 (file)
--- a/tree-walk.h
+++ b/tree-walk.h
@@ -2,7 +2,7 @@
 #define TREE_WALK_H
 
 struct tree_desc {
-       void *buf;
+       const void *buf;
        unsigned long size;
 };
 
@@ -16,6 +16,9 @@ struct name_entry {
 void update_tree_entry(struct tree_desc *);
 const unsigned char *tree_entry_extract(struct tree_desc *, const char **, unsigned int *);
 
+/* Helper function that does both of the above and returns true for success */
+int tree_entry(struct tree_desc *, struct name_entry *);
+
 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);