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#ifndef OBJECT_H
#define OBJECT_H

#include "cache.h"

struct buffer_slab;

struct parsed_object_pool {
	struct object **obj_hash;
	int nr_objs, obj_hash_size;

	/* TODO: migrate alloc_states to mem-pool? */
	struct alloc_state *blob_state;
	struct alloc_state *tree_state;
	struct alloc_state *commit_state;
	struct alloc_state *tag_state;
	struct alloc_state *object_state;
	unsigned commit_count;

	/* parent substitutions from .git/info/grafts and .git/shallow */
	struct commit_graft **grafts;
	int grafts_alloc, grafts_nr;

	int is_shallow;
	struct stat_validity *shallow_stat;
	char *alternate_shallow_file;

	int commit_graft_prepared;

	struct buffer_slab *buffer_slab;
};

struct parsed_object_pool *parsed_object_pool_new(void);
void parsed_object_pool_clear(struct parsed_object_pool *o);

struct object_list {
	struct object *item;
	struct object_list *next;
};

struct object_array {
	unsigned int nr;
	unsigned int alloc;
	struct object_array_entry {
		struct object *item;
		/*
		 * name or NULL.  If non-NULL, the memory pointed to
		 * is owned by this object *except* if it points at
		 * object_array_slopbuf, which is a static copy of the
		 * empty string.
		 */
		char *name;
		char *path;
		unsigned mode;
	} *objects;
};

#define OBJECT_ARRAY_INIT { 0, 0, NULL }

/*
 * object flag allocation:
 * revision.h:               0---------10                              25----28
 * fetch-pack.c:             01
 * negotiator/default.c:       2--5
 * walker.c:                 0-2
 * upload-pack.c:                4       11-----14  16-----19
 * builtin/blame.c:                        12-13
 * bisect.c:                                        16
 * bundle.c:                                        16
 * http-push.c:                                     16-----19
 * commit-graph.c:                                15
 * commit-reach.c:                                  16-----19
 * sha1-name.c:                                              20
 * list-objects-filter.c:                                      21
 * builtin/fsck.c:           0--3
 * builtin/index-pack.c:                                     2021
 * builtin/pack-objects.c:                                   20
 * builtin/reflog.c:                   10--12
 * builtin/show-branch.c:    0-------------------------------------------26
 * builtin/unpack-objects.c:                                 2021
 */
#define FLAG_BITS  29

/*
 * The object type is stored in 3 bits.
 */
struct object {
	unsigned parsed : 1;
	unsigned type : TYPE_BITS;
	unsigned flags : FLAG_BITS;
	struct object_id oid;
};

const char *type_name(unsigned int type);
int type_from_string_gently(const char *str, ssize_t, int gentle);
#define type_from_string(str) type_from_string_gently(str, -1, 0)

/*
 * Return the current number of buckets in the object hashmap.
 */
unsigned int get_max_object_index(struct repository *);

/*
 * Return the object from the specified bucket in the object hashmap.
 */
struct object *get_indexed_object(struct repository *, unsigned int);

/*
 * This can be used to see if we have heard of the object before, but
 * it can return "yes we have, and here is a half-initialised object"
 * for an object that we haven't loaded/parsed yet.
 *
 * When parsing a commit to create an in-core commit object, its
 * parents list holds commit objects that represent its parents, but
 * they are expected to be lazily initialized and do not know what
 * their trees or parents are yet.  When this function returns such a
 * half-initialised objects, the caller is expected to initialize them
 * by calling parse_object() on them.
 */
struct object *lookup_object(struct repository *r, const struct object_id *oid);

void *create_object(struct repository *r, const struct object_id *oid, void *obj);

void *object_as_type(struct repository *r, struct object *obj, enum object_type type, int quiet);

/*
 * Returns the object, having parsed it to find out what it is.
 *
 * Returns NULL if the object is missing or corrupt.
 */
struct object *parse_object(struct repository *r, const struct object_id *oid);

/*
 * Like parse_object, but will die() instead of returning NULL. If the
 * "name" parameter is not NULL, it is included in the error message
 * (otherwise, the hex object ID is given).
 */
struct object *parse_object_or_die(struct repository *, const struct object_id *oid, const char *name);

/* Given the result of read_sha1_file(), returns the object after
 * parsing it.  eaten_p indicates if the object has a borrowed copy
 * of buffer and the caller should not free() it.
 */
struct object *parse_object_buffer(struct repository *r, const struct object_id *oid, enum object_type type, unsigned long size, void *buffer, int *eaten_p);

/** Returns the object, with potentially excess memory allocated. **/
struct object *lookup_unknown_object(struct repository *, const struct object_id *oid);

struct object_list *object_list_insert(struct object *item,
				       struct object_list **list_p);

int object_list_contains(struct object_list *list, struct object *obj);

/* Object array handling .. */
void add_object_array(struct object *obj, const char *name, struct object_array *array);
void add_object_array_with_path(struct object *obj, const char *name, struct object_array *array, unsigned mode, const char *path);

/*
 * Returns NULL if the array is empty. Otherwise, returns the last object
 * after removing its entry from the array. Other resources associated
 * with that object are left in an unspecified state and should not be
 * examined.
 */
struct object *object_array_pop(struct object_array *array);

typedef int (*object_array_each_func_t)(struct object_array_entry *, void *);

/*
 * Apply want to each entry in array, retaining only the entries for
 * which the function returns true.  Preserve the order of the entries
 * that are retained.
 */
void object_array_filter(struct object_array *array,
			 object_array_each_func_t want, void *cb_data);

/*
 * Remove from array all but the first entry with a given name.
 * Warning: this function uses an O(N^2) algorithm.
 */
void object_array_remove_duplicates(struct object_array *array);

/*
 * Remove any objects from the array, freeing all used memory; afterwards
 * the array is ready to store more objects with add_object_array().
 */
void object_array_clear(struct object_array *array);

void clear_object_flags(struct repository *, unsigned flags);

/*
 * Clear the specified object flags from all in-core commit objects.
 */
void clear_commit_marks_all(unsigned int flags);

#endif /* OBJECT_H */
debug log:

solving bfc95e062a ...
found bfc95e062a in https://public-inbox.org/git/a8202cc5353d274f6278f2350ae1371af0a093d5.1581535151.git.gitgitgadget@gmail.com/
found 92af2ead8f in https://public-inbox.org/git/ef8ec98181ff03d756be80f1d3796eda98c7f475.1581535151.git.gitgitgadget@gmail.com/
found 375236cec3 in https://public-inbox.org/git/16dd64618ab6a086727685e9eca3850fabc46437.1581535151.git.gitgitgadget@gmail.com/
found 5a8ae274ee in https://public-inbox.org/git/d98b7caff56cc839f251ac43c36826ecf800cf2f.1581535151.git.gitgitgadget@gmail.com/
found 25f5ab3d54 in https://80x24.org/mirrors/git.git
preparing index
index prepared:
100644 25f5ab3d54a8b1111b8bb4ce0e4b024894ce8e54	object.h

applying [1/4] https://public-inbox.org/git/d98b7caff56cc839f251ac43c36826ecf800cf2f.1581535151.git.gitgitgadget@gmail.com/
diff --git a/object.h b/object.h
index 25f5ab3d54..5a8ae274ee 100644


applying [2/4] https://public-inbox.org/git/16dd64618ab6a086727685e9eca3850fabc46437.1581535151.git.gitgitgadget@gmail.com/
diff --git a/object.h b/object.h
index 5a8ae274ee..375236cec3 100644


applying [3/4] https://public-inbox.org/git/ef8ec98181ff03d756be80f1d3796eda98c7f475.1581535151.git.gitgitgadget@gmail.com/
diff --git a/object.h b/object.h
index 375236cec3..92af2ead8f 100644


applying [4/4] https://public-inbox.org/git/a8202cc5353d274f6278f2350ae1371af0a093d5.1581535151.git.gitgitgadget@gmail.com/
diff --git a/object.h b/object.h
index 92af2ead8f..bfc95e062a 100644

Checking patch object.h...
Applied patch object.h cleanly.
Checking patch object.h...
Applied patch object.h cleanly.
Checking patch object.h...
Applied patch object.h cleanly.
Checking patch object.h...
Applied patch object.h cleanly.

index at:
100644 bfc95e062a7807e200b9c16ef5b33275f25b2149	object.h

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