1 files changed, 103 insertions, 0 deletions
diff --git a/tree-walk.h b/tree-walk.h
new file mode 100644
index 0000000000..b6bd1b4ccf
--- /dev/null
+++ b/tree-walk.h
@@ -0,0 +1,103 @@
+#ifndef TREE_WALK_H
+#define TREE_WALK_H
+
+struct name_entry {
+	const struct object_id *oid;
+	const char *path;
+	unsigned int mode;
+};
+
+struct tree_desc {
+	const void *buffer;
+	struct name_entry entry;
+	unsigned int size;
+};
+
+static inline const struct object_id *tree_entry_extract(struct tree_desc *desc, const char **pathp, unsigned int *modep)
+{
+	*pathp = desc->entry.path;
+	*modep = desc->entry.mode;
+	return desc->entry.oid;
+}
+
+static inline int tree_entry_len(const struct name_entry *ne)
+{
+	return (const char *)ne->oid - ne->path - 1;
+}
+
+/*
+ * The _gently versions of these functions warn and return false on a
+ * corrupt tree entry rather than dying,
+ */
+
+void update_tree_entry(struct tree_desc *);
+int update_tree_entry_gently(struct tree_desc *);
+void init_tree_desc(struct tree_desc *desc, const void *buf, unsigned long size);
+int init_tree_desc_gently(struct tree_desc *desc, const void *buf, unsigned long size);
+
+/*
+ * Helper function that does both tree_entry_extract() and update_tree_entry()
+ * and returns true for success
+ */
+int tree_entry(struct tree_desc *, struct name_entry *);
+int tree_entry_gently(struct tree_desc *, struct name_entry *);
+
+void *fill_tree_descriptor(struct tree_desc *desc, const struct object_id *oid);
+
+struct traverse_info;
+typedef int (*traverse_callback_t)(int n, unsigned long mask, unsigned long dirmask, struct name_entry *entry, struct traverse_info *);
+int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info);
+
+enum follow_symlinks_result {
+	FOUND = 0, /* This includes out-of-tree links */
+	MISSING_OBJECT = -1, /* The initial symlink is missing */
+	DANGLING_SYMLINK = -2, /*
+				* The initial symlink is there, but
+				* (transitively) points to a missing
+				* in-tree file
+				*/
+	SYMLINK_LOOP = -3,
+	NOT_DIR = -4, /*
+		       * Somewhere along the symlink chain, a path is
+		       * requested which contains a file as a
+		       * non-final element.
+		       */
+};
+
+enum follow_symlinks_result get_tree_entry_follow_symlinks(unsigned char *tree_sha1, const char *name, unsigned char *result, struct strbuf *result_path, unsigned *mode);
+
+struct traverse_info {
+	const char *traverse_path;
+	struct traverse_info *prev;
+	struct name_entry name;
+	int pathlen;
+	struct pathspec *pathspec;
+
+	unsigned long df_conflicts;
+	traverse_callback_t fn;
+	void *data;
+	int show_all_errors;
+};
+
+int get_tree_entry(const unsigned char *, const char *, unsigned char *, unsigned *);
+extern char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n);
+extern void setup_traverse_info(struct traverse_info *info, const char *base);
+
+static inline int traverse_path_len(const struct traverse_info *info, const struct name_entry *n)
+{
+	return info->pathlen + tree_entry_len(n);
+}
+
+/* in general, positive means "kind of interesting" */
+enum interesting {
+	all_entries_not_interesting = -1, /* no, and no subsequent entries will be either */
+	entry_not_interesting = 0,
+	entry_interesting = 1,
+	all_entries_interesting = 2 /* yes, and all subsequent entries will be */
+};
+
+extern enum interesting tree_entry_interesting(const struct name_entry *,
+					       struct strbuf *, int,
+					       const struct pathspec *ps);
+
+#endif