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#ifndef CACHE_TREE_H
#define CACHE_TREE_H
 
#include "tree.h"
#include "tree-walk.h"
 
struct cache_tree;
struct cache_tree_sub {
	struct cache_tree *cache_tree;
	int count;		/* internally used by update_one() */
	int namelen;
	int used;
	char name[FLEX_ARRAY];
};
 
struct cache_tree {
	int entry_count; /* negative means "invalid" */
	unsigned char sha1[20];
	int subtree_nr;
	int subtree_alloc;
	struct cache_tree_sub **down;
};
 
struct cache_tree *cache_tree(void);
void cache_tree_free(struct cache_tree **);
void cache_tree_invalidate_path(struct index_state *, const char *);
struct cache_tree_sub *cache_tree_sub(struct cache_tree *, const char *);
 
void cache_tree_write(struct strbuf *, struct cache_tree *root);
struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);
 
int cache_tree_fully_valid(struct cache_tree *);
int cache_tree_update(struct index_state *, int);
 
int update_main_cache_tree(int);
 
/* bitmasks to write_cache_as_tree flags */
#define WRITE_TREE_MISSING_OK 1
#define WRITE_TREE_IGNORE_CACHE_TREE 2
#define WRITE_TREE_DRY_RUN 4
#define WRITE_TREE_SILENT 8
 
/* error return codes */
#define WRITE_TREE_UNREADABLE_INDEX (-1)
#define WRITE_TREE_UNMERGED_INDEX (-2)
#define WRITE_TREE_PREFIX_ERROR (-3)
 
int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix);
void prime_cache_tree(struct cache_tree **, struct tree *);
 
extern int cache_tree_matches_traversal(struct cache_tree *, struct name_entry *ent, struct traverse_info *info);
 
#endif