[thirdparty/git.git] / pack-objects.h

#ifndef PACK_OBJECTS_H
#define PACK_OBJECTS_H

#include "object-store.h"
#include "thread-utils.h"
#include "pack.h"

struct repository;

#define DEFAULT_DELTA_CACHE_SIZE (256 * 1024 * 1024)

#define OE_DFS_STATE_BITS	2
#define OE_DEPTH_BITS		12
#define OE_IN_PACK_BITS		10
#define OE_Z_DELTA_BITS		20
/*
 * Note that oe_set_size() becomes expensive when the given size is
 * above this limit. Don't lower it too much.
 */
#define OE_SIZE_BITS		31
#define OE_DELTA_SIZE_BITS	23

/*
 * State flags for depth-first search used for analyzing delta cycles.
 *
 * The depth is measured in delta-links to the base (so if A is a delta
 * against B, then A has a depth of 1, and B a depth of 0).
 */
enum dfs_state {
	DFS_NONE = 0,
	DFS_ACTIVE,
	DFS_DONE,
	DFS_NUM_STATES
};

/*
 * The size of struct nearly determines pack-objects's memory
 * consumption. This struct is packed tight for that reason. When you
 * add or reorder something in this struct, think a bit about this.
 *
 * basic object info
 * -----------------
 * idx.oid is filled up before delta searching starts. idx.crc32 is
 * only valid after the object is written out and will be used for
 * generating the index. idx.offset will be both gradually set and
 * used in writing phase (base objects get offset first, then deltas
 * refer to them)
 *
 * "size" is the uncompressed object size. Compressed size of the raw
 * data for an object in a pack is not stored anywhere but is computed
 * and made available when reverse .idx is made. Note that when a
 * delta is reused, "size" is the uncompressed _delta_ size, not the
 * canonical one after the delta has been applied.
 *
 * "hash" contains a path name hash which is used for sorting the
 * delta list and also during delta searching. Once prepare_pack()
 * returns it's no longer needed.
 *
 * source pack info
 * ----------------
 * The (in_pack, in_pack_offset) tuple contains the location of the
 * object in the source pack. in_pack_header_size allows quickly
 * skipping the header and going straight to the zlib stream.
 *
 * "type" and "in_pack_type" both describe object type. in_pack_type
 * may contain a delta type, while type is always the canonical type.
 *
 * deltas
 * ------
 * Delta links (delta, delta_child and delta_sibling) are created to
 * reflect that delta graph from the source pack then updated or added
 * during delta searching phase when we find better deltas.
 *
 * delta_child and delta_sibling are last needed in
 * compute_write_order(). "delta" and "delta_size" must remain valid
 * at object writing phase in case the delta is not cached.
 *
 * If a delta is cached in memory and is compressed, delta_data points
 * to the data and z_delta_size contains the compressed size. If it's
 * uncompressed [1], z_delta_size must be zero. delta_size is always
 * the uncompressed size and must be valid even if the delta is not
 * cached.
 *
 * [1] during try_delta phase we don't bother with compressing because
 * the delta could be quickly replaced with a better one.
 */
struct object_entry {
	struct pack_idx_entry idx;
	void *delta_data;	/* cached delta (uncompressed) */
	off_t in_pack_offset;
	uint32_t hash;			/* name hint hash */
	unsigned size_:OE_SIZE_BITS;
	unsigned size_valid:1;
	uint32_t delta_idx;	/* delta base object */
	uint32_t delta_child_idx; /* deltified objects who bases me */
	uint32_t delta_sibling_idx; /* other deltified objects who
				     * uses the same base as me
				     */
	unsigned delta_size_:OE_DELTA_SIZE_BITS; /* delta data size (uncompressed) */
	unsigned delta_size_valid:1;
	unsigned char in_pack_header_size;
	unsigned in_pack_idx:OE_IN_PACK_BITS;	/* already in pack */
	unsigned z_delta_size:OE_Z_DELTA_BITS;
	unsigned type_valid:1;
	unsigned no_try_delta:1;
	unsigned type_:TYPE_BITS;
	unsigned in_pack_type:TYPE_BITS; /* could be delta */

	unsigned preferred_base:1; /*
				    * we do not pack this, but is available
				    * to be used as the base object to delta
				    * objects against.
				    */
	unsigned tagged:1; /* near the very tip of refs */
	unsigned filled:1; /* assigned write-order */
	unsigned dfs_state:OE_DFS_STATE_BITS;
	unsigned depth:OE_DEPTH_BITS;
	unsigned ext_base:1; /* delta_idx points outside packlist */

	/*
	 * pahole results on 64-bit linux (gcc and clang)
	 *
	 *   size: 80, bit_padding: 9 bits
	 *
	 * and on 32-bit (gcc)
	 *
	 *   size: 76, bit_padding: 9 bits
	 */
};

struct packing_data {
	struct repository *repo;
	struct object_entry *objects;
	uint32_t nr_objects, nr_alloc;

	int32_t *index;
	uint32_t index_size;

	unsigned int *in_pack_pos;
	unsigned long *delta_size;

	/*
	 * Only one of these can be non-NULL and they have different
	 * sizes. if in_pack_by_idx is allocated, oe_in_pack() returns
	 * the pack of an object using in_pack_idx field. If not,
	 * in_pack[] array is used the same way as in_pack_pos[]
	 */
	struct packed_git **in_pack_by_idx;
	struct packed_git **in_pack;

	/*
	 * During packing with multiple threads, protect the in-core
	 * object database from concurrent accesses.
	 */
	pthread_mutex_t odb_lock;

	/*
	 * This list contains entries for bases which we know the other side
	 * has (e.g., via reachability bitmaps), but which aren't in our
	 * "objects" list.
	 */
	struct object_entry *ext_bases;
	uint32_t nr_ext, alloc_ext;

	uintmax_t oe_size_limit;
	uintmax_t oe_delta_size_limit;

	/* delta islands */
	unsigned int *tree_depth;
	unsigned char *layer;
};

void prepare_packing_data(struct repository *r, struct packing_data *pdata);

/* Protect access to object database */
static inline void packing_data_lock(struct packing_data *pdata)
{
	pthread_mutex_lock(&pdata->odb_lock);
}
static inline void packing_data_unlock(struct packing_data *pdata)
{
	pthread_mutex_unlock(&pdata->odb_lock);
}

struct object_entry *packlist_alloc(struct packing_data *pdata,
				    const struct object_id *oid);

struct object_entry *packlist_find(struct packing_data *pdata,
				   const struct object_id *oid);

static inline uint32_t pack_name_hash(const char *name)
{
	uint32_t c, hash = 0;

	if (!name)
		return 0;

	/*
	 * This effectively just creates a sortable number from the
	 * last sixteen non-whitespace characters. Last characters
	 * count "most", so things that end in ".c" sort together.
	 */
	while ((c = *name++) != 0) {
		if (isspace(c))
			continue;
		hash = (hash >> 2) + (c << 24);
	}
	return hash;
}

static inline enum object_type oe_type(const struct object_entry *e)
{
	return e->type_valid ? e->type_ : OBJ_BAD;
}

static inline void oe_set_type(struct object_entry *e,
			       enum object_type type)
{
	if (type >= OBJ_ANY)
		BUG("OBJ_ANY cannot be set in pack-objects code");

	e->type_valid = type >= OBJ_NONE;
	e->type_ = (unsigned)type;
}

static inline unsigned int oe_in_pack_pos(const struct packing_data *pack,
					  const struct object_entry *e)
{
	return pack->in_pack_pos[e - pack->objects];
}

static inline void oe_set_in_pack_pos(const struct packing_data *pack,
				      const struct object_entry *e,
				      unsigned int pos)
{
	pack->in_pack_pos[e - pack->objects] = pos;
}

static inline struct packed_git *oe_in_pack(const struct packing_data *pack,
					    const struct object_entry *e)
{
	if (pack->in_pack_by_idx)
		return pack->in_pack_by_idx[e->in_pack_idx];
	else
		return pack->in_pack[e - pack->objects];
}

void oe_map_new_pack(struct packing_data *pack);

static inline void oe_set_in_pack(struct packing_data *pack,
				  struct object_entry *e,
				  struct packed_git *p)
{
	if (!p->index)
		oe_map_new_pack(pack);
	if (pack->in_pack_by_idx)
		e->in_pack_idx = p->index;
	else
		pack->in_pack[e - pack->objects] = p;
}

static inline struct object_entry *oe_delta(
		const struct packing_data *pack,
		const struct object_entry *e)
{
	if (!e->delta_idx)
		return NULL;
	if (e->ext_base)
		return &pack->ext_bases[e->delta_idx - 1];
	else
		return &pack->objects[e->delta_idx - 1];
}

static inline void oe_set_delta(struct packing_data *pack,
				struct object_entry *e,
				struct object_entry *delta)
{
	if (delta)
		e->delta_idx = (delta - pack->objects) + 1;
	else
		e->delta_idx = 0;
}

void oe_set_delta_ext(struct packing_data *pack,
		      struct object_entry *e,
		      const unsigned char *sha1);

static inline struct object_entry *oe_delta_child(
		const struct packing_data *pack,
		const struct object_entry *e)
{
	if (e->delta_child_idx)
		return &pack->objects[e->delta_child_idx - 1];
	return NULL;
}

static inline void oe_set_delta_child(struct packing_data *pack,
				      struct object_entry *e,
				      struct object_entry *delta)
{
	if (delta)
		e->delta_child_idx = (delta - pack->objects) + 1;
	else
		e->delta_child_idx = 0;
}

static inline struct object_entry *oe_delta_sibling(
		const struct packing_data *pack,
		const struct object_entry *e)
{
	if (e->delta_sibling_idx)
		return &pack->objects[e->delta_sibling_idx - 1];
	return NULL;
}

static inline void oe_set_delta_sibling(struct packing_data *pack,
					struct object_entry *e,
					struct object_entry *delta)
{
	if (delta)
		e->delta_sibling_idx = (delta - pack->objects) + 1;
	else
		e->delta_sibling_idx = 0;
}

unsigned long oe_get_size_slow(struct packing_data *pack,
			       const struct object_entry *e);
static inline unsigned long oe_size(struct packing_data *pack,
				    const struct object_entry *e)
{
	if (e->size_valid)
		return e->size_;

	return oe_get_size_slow(pack, e);
}

static inline int oe_size_less_than(struct packing_data *pack,
				    const struct object_entry *lhs,
				    unsigned long rhs)
{
	if (lhs->size_valid)
		return lhs->size_ < rhs;
	if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
		return 0;
	return oe_get_size_slow(pack, lhs) < rhs;
}

static inline int oe_size_greater_than(struct packing_data *pack,
				       const struct object_entry *lhs,
				       unsigned long rhs)
{
	if (lhs->size_valid)
		return lhs->size_ > rhs;
	if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
		return 1;
	return oe_get_size_slow(pack, lhs) > rhs;
}

static inline void oe_set_size(struct packing_data *pack,
			       struct object_entry *e,
			       unsigned long size)
{
	if (size < pack->oe_size_limit) {
		e->size_ = size;
		e->size_valid = 1;
	} else {
		e->size_valid = 0;
		if (oe_get_size_slow(pack, e) != size)
			BUG("'size' is supposed to be the object size!");
	}
}

static inline unsigned long oe_delta_size(struct packing_data *pack,
					  const struct object_entry *e)
{
	if (e->delta_size_valid)
		return e->delta_size_;

	/*
	 * pack->delta_size[] can't be NULL because oe_set_delta_size()
	 * must have been called when a new delta is saved with
	 * oe_set_delta().
	 * If oe_delta() returns NULL (i.e. default state, which means
	 * delta_size_valid is also false), then the caller must never
	 * call oe_delta_size().
	 */
	return pack->delta_size[e - pack->objects];
}

static inline void oe_set_delta_size(struct packing_data *pack,
				     struct object_entry *e,
				     unsigned long size)
{
	if (size < pack->oe_delta_size_limit) {
		e->delta_size_ = size;
		e->delta_size_valid = 1;
	} else {
		packing_data_lock(pack);
		if (!pack->delta_size)
			ALLOC_ARRAY(pack->delta_size, pack->nr_alloc);
		packing_data_unlock(pack);

		pack->delta_size[e - pack->objects] = size;
		e->delta_size_valid = 0;
	}
}

static inline unsigned int oe_tree_depth(struct packing_data *pack,
					 struct object_entry *e)
{
	if (!pack->tree_depth)
		return 0;
	return pack->tree_depth[e - pack->objects];
}

static inline void oe_set_tree_depth(struct packing_data *pack,
				     struct object_entry *e,
				     unsigned int tree_depth)
{
	if (!pack->tree_depth)
		CALLOC_ARRAY(pack->tree_depth, pack->nr_alloc);
	pack->tree_depth[e - pack->objects] = tree_depth;
}

static inline unsigned char oe_layer(struct packing_data *pack,
				     struct object_entry *e)
{
	if (!pack->layer)
		return 0;
	return pack->layer[e - pack->objects];
}

static inline void oe_set_layer(struct packing_data *pack,
				struct object_entry *e,
				unsigned char layer)
{
	if (!pack->layer)
		CALLOC_ARRAY(pack->layer, pack->nr_alloc);
	pack->layer[e - pack->objects] = layer;
}

#endif
Commit	Line	Data
2834bc27 VM	1	#ifndef PACK_OBJECTS_H
	2	#define PACK_OBJECTS_H
	3
43fa44fa	4	#include "object-store.h"
9ac3f0e5	5	#include "thread-utils.h"
ef3ca954	6	#include "pack.h"
43fa44fa	7
7c141127 NTND	8	struct repository;
7c141127 NTND	9
9806f5a7 NTND	10	#define DEFAULT_DELTA_CACHE_SIZE (256 * 1024 * 1024)
9806f5a7 NTND	11
0c6804ab	12	#define OE_DFS_STATE_BITS 2
b5c0cbd8	13	#define OE_DEPTH_BITS 12
43fa44fa	14	#define OE_IN_PACK_BITS 10
0cb3c142	15	#define OE_Z_DELTA_BITS 20
ac77d0c3 NTND	16	/*
	17	* Note that oe_set_size() becomes expensive when the given size is
	18	* above this limit. Don't lower it too much.
	19	*/
	20	#define OE_SIZE_BITS 31
9ac3f0e5	21	#define OE_DELTA_SIZE_BITS 23
0c6804ab NTND	22
	23	/*
	24	* State flags for depth-first search used for analyzing delta cycles.
	25	*
	26	* The depth is measured in delta-links to the base (so if A is a delta
	27	* against B, then A has a depth of 1, and B a depth of 0).
	28	*/
	29	enum dfs_state {
	30	DFS_NONE = 0,
	31	DFS_ACTIVE,
	32	DFS_DONE,
	33	DFS_NUM_STATES
	34	};
	35
8d6ccce1	36	/*
3b13a5f2 NTND	37	* The size of struct nearly determines pack-objects's memory
	38	* consumption. This struct is packed tight for that reason. When you
	39	* add or reorder something in this struct, think a bit about this.
	40	*
8d6ccce1 NTND	41	* basic object info
	42	* -----------------
	43	* idx.oid is filled up before delta searching starts. idx.crc32 is
	44	* only valid after the object is written out and will be used for
	45	* generating the index. idx.offset will be both gradually set and
	46	* used in writing phase (base objects get offset first, then deltas
	47	* refer to them)
	48	*
	49	* "size" is the uncompressed object size. Compressed size of the raw
	50	* data for an object in a pack is not stored anywhere but is computed
27a7d067 NTND	51	* and made available when reverse .idx is made. Note that when a
	52	* delta is reused, "size" is the uncompressed _delta_ size, not the
	53	* canonical one after the delta has been applied.
8d6ccce1 NTND	54	*
	55	* "hash" contains a path name hash which is used for sorting the
	56	* delta list and also during delta searching. Once prepare_pack()
	57	* returns it's no longer needed.
	58	*
	59	* source pack info
	60	* ----------------
	61	* The (in_pack, in_pack_offset) tuple contains the location of the
	62	* object in the source pack. in_pack_header_size allows quickly
	63	* skipping the header and going straight to the zlib stream.
	64	*
	65	* "type" and "in_pack_type" both describe object type. in_pack_type
	66	* may contain a delta type, while type is always the canonical type.
	67	*
	68	* deltas
	69	* ------
	70	* Delta links (delta, delta_child and delta_sibling) are created to
	71	* reflect that delta graph from the source pack then updated or added
	72	* during delta searching phase when we find better deltas.
	73	*
	74	* delta_child and delta_sibling are last needed in
	75	* compute_write_order(). "delta" and "delta_size" must remain valid
	76	* at object writing phase in case the delta is not cached.
	77	*
	78	* If a delta is cached in memory and is compressed, delta_data points
	79	* to the data and z_delta_size contains the compressed size. If it's
	80	* uncompressed [1], z_delta_size must be zero. delta_size is always
	81	* the uncompressed size and must be valid even if the delta is not
	82	* cached.
	83	*
	84	* [1] during try_delta phase we don't bother with compressing because
	85	* the delta could be quickly replaced with a better one.
	86	*/
2834bc27 VM	87	struct object_entry {
2834bc27 VM	88	struct pack_idx_entry idx;
2834bc27	89	void delta_data; / cached delta (uncompressed) */
3b13a5f2	90	off_t in_pack_offset;
2834bc27	91	uint32_t hash; /* name hint hash */
ac77d0c3 NTND	92	unsigned size_:OE_SIZE_BITS;
ac77d0c3 NTND	93	unsigned size_valid:1;
898eba5e NTND	94	uint32_t delta_idx; /* delta base object */
	95	uint32_t delta_child_idx; /* deltified objects who bases me */
	96	uint32_t delta_sibling_idx; /* other deltified objects who
	97	* uses the same base as me
	98	*/
0aca34e8 NTND	99	unsigned delta_size_:OE_DELTA_SIZE_BITS; /* delta data size (uncompressed) */
0aca34e8 NTND	100	unsigned delta_size_valid:1;
9ac3f0e5	101	unsigned char in_pack_header_size;
3b13a5f2	102	unsigned in_pack_idx:OE_IN_PACK_BITS; /* already in pack */
0cb3c142	103	unsigned z_delta_size:OE_Z_DELTA_BITS;
3b13a5f2	104	unsigned type_valid:1;
3b13a5f2	105	unsigned no_try_delta:1;
9ac3f0e5	106	unsigned type_:TYPE_BITS;
fd9b1bae	107	unsigned in_pack_type:TYPE_BITS; /* could be delta */
c8d521fa	108
2834bc27 VM	109	unsigned preferred_base:1; /*
	110	* we do not pack this, but is available
	111	* to be used as the base object to delta
	112	* objects against.
	113	*/
2834bc27 VM	114	unsigned tagged:1; /* near the very tip of refs */
2834bc27 VM	115	unsigned filled:1; /* assigned write-order */
0c6804ab	116	unsigned dfs_state:OE_DFS_STATE_BITS;
b5c0cbd8	117	unsigned depth:OE_DEPTH_BITS;
6a1e32d5	118	unsigned ext_base:1; /* delta_idx points outside packlist */
4cf2143e JK	119
4cf2143e JK	120	/*
3b13a5f2	121	* pahole results on 64-bit linux (gcc and clang)
7dbabbbe	122	*
9ac3f0e5	123	* size: 80, bit_padding: 9 bits
3b13a5f2 NTND	124	*
	125	* and on 32-bit (gcc)
	126	*
9ac3f0e5	127	* size: 76, bit_padding: 9 bits
4cf2143e	128	*/
2834bc27 VM	129	};
	130
	131	struct packing_data {
7c141127	132	struct repository *repo;
2834bc27 VM	133	struct object_entry *objects;
	134	uint32_t nr_objects, nr_alloc;
	135
	136	int32_t *index;
	137	uint32_t index_size;
06af3bba NTND	138
06af3bba NTND	139	unsigned int *in_pack_pos;
9ac3f0e5	140	unsigned long *delta_size;
43fa44fa NTND	141
	142	/*
	143	* Only one of these can be non-NULL and they have different
	144	* sizes. if in_pack_by_idx is allocated, oe_in_pack() returns
	145	* the pack of an object using in_pack_idx field. If not,
	146	* in_pack[] array is used the same way as in_pack_pos[]
	147	*/
	148	struct packed_git **in_pack_by_idx;
	149	struct packed_git **in_pack;
ac77d0c3	150
edb673cf PH	151	/*
	152	* During packing with multiple threads, protect the in-core
	153	* object database from concurrent accesses.
	154	*/
	155	pthread_mutex_t odb_lock;
9ac3f0e5	156
6a1e32d5 JK	157	/*
	158	* This list contains entries for bases which we know the other side
	159	* has (e.g., via reachability bitmaps), but which aren't in our
	160	* "objects" list.
	161	*/
	162	struct object_entry *ext_bases;
	163	uint32_t nr_ext, alloc_ext;
	164
ac77d0c3	165	uintmax_t oe_size_limit;
9ac3f0e5	166	uintmax_t oe_delta_size_limit;
108f5303 CC	167
	168	/* delta islands */
	169	unsigned int *tree_depth;
fe0ac2fb	170	unsigned char *layer;
2834bc27 VM	171	};
2834bc27 VM	172
7c141127	173	void prepare_packing_data(struct repository r, struct packing_data pdata);
9ac3f0e5	174
edb673cf	175	/* Protect access to object database */
9ac3f0e5 NTND	176	static inline void packing_data_lock(struct packing_data *pdata)
9ac3f0e5 NTND	177	{
edb673cf	178	pthread_mutex_lock(&pdata->odb_lock);
9ac3f0e5 NTND	179	}
	180	static inline void packing_data_unlock(struct packing_data *pdata)
	181	{
edb673cf	182	pthread_mutex_unlock(&pdata->odb_lock);
9ac3f0e5 NTND	183	}
9ac3f0e5 NTND	184
2834bc27	185	struct object_entry packlist_alloc(struct packing_data pdata,
3a37876b	186	const struct object_id *oid);
2834bc27 VM	187
2834bc27 VM	188	struct object_entry packlist_find(struct packing_data pdata,
3a37876b	189	const struct object_id *oid);
2834bc27	190
68fb36eb VM	191	static inline uint32_t pack_name_hash(const char *name)
	192	{
	193	uint32_t c, hash = 0;
	194
	195	if (!name)
	196	return 0;
	197
	198	/*
	199	* This effectively just creates a sortable number from the
	200	* last sixteen non-whitespace characters. Last characters
	201	* count "most", so things that end in ".c" sort together.
	202	*/
	203	while ((c = *name++) != 0) {
	204	if (isspace(c))
	205	continue;
	206	hash = (hash >> 2) + (c << 24);
	207	}
	208	return hash;
	209	}
	210
fd9b1bae NTND	211	static inline enum object_type oe_type(const struct object_entry *e)
	212	{
	213	return e->type_valid ? e->type_ : OBJ_BAD;
	214	}
	215
	216	static inline void oe_set_type(struct object_entry *e,
	217	enum object_type type)
	218	{
	219	if (type >= OBJ_ANY)
	220	BUG("OBJ_ANY cannot be set in pack-objects code");
	221
	222	e->type_valid = type >= OBJ_NONE;
	223	e->type_ = (unsigned)type;
	224	}
	225
06af3bba NTND	226	static inline unsigned int oe_in_pack_pos(const struct packing_data *pack,
	227	const struct object_entry *e)
	228	{
	229	return pack->in_pack_pos[e - pack->objects];
	230	}
	231
	232	static inline void oe_set_in_pack_pos(const struct packing_data *pack,
	233	const struct object_entry *e,
	234	unsigned int pos)
	235	{
	236	pack->in_pack_pos[e - pack->objects] = pos;
	237	}
	238
43fa44fa NTND	239	static inline struct packed_git oe_in_pack(const struct packing_data pack,
	240	const struct object_entry *e)
	241	{
	242	if (pack->in_pack_by_idx)
	243	return pack->in_pack_by_idx[e->in_pack_idx];
	244	else
	245	return pack->in_pack[e - pack->objects];
	246	}
	247
c409d108 JK	248	void oe_map_new_pack(struct packing_data *pack);
c409d108 JK	249
43fa44fa NTND	250	static inline void oe_set_in_pack(struct packing_data *pack,
	251	struct object_entry *e,
	252	struct packed_git *p)
	253	{
	254	if (!p->index)
c409d108	255	oe_map_new_pack(pack);
43fa44fa NTND	256	if (pack->in_pack_by_idx)
	257	e->in_pack_idx = p->index;
	258	else
	259	pack->in_pack[e - pack->objects] = p;
	260	}
	261
898eba5e NTND	262	static inline struct object_entry *oe_delta(
	263	const struct packing_data *pack,
	264	const struct object_entry *e)
	265	{
6a1e32d5 JK	266	if (!e->delta_idx)
	267	return NULL;
	268	if (e->ext_base)
	269	return &pack->ext_bases[e->delta_idx - 1];
	270	else
898eba5e	271	return &pack->objects[e->delta_idx - 1];
898eba5e NTND	272	}
	273
	274	static inline void oe_set_delta(struct packing_data *pack,
	275	struct object_entry *e,
	276	struct object_entry *delta)
	277	{
	278	if (delta)
	279	e->delta_idx = (delta - pack->objects) + 1;
	280	else
	281	e->delta_idx = 0;
	282	}
	283
6a1e32d5 JK	284	void oe_set_delta_ext(struct packing_data *pack,
	285	struct object_entry *e,
	286	const unsigned char *sha1);
	287
898eba5e NTND	288	static inline struct object_entry *oe_delta_child(
	289	const struct packing_data *pack,
	290	const struct object_entry *e)
	291	{
	292	if (e->delta_child_idx)
	293	return &pack->objects[e->delta_child_idx - 1];
	294	return NULL;
	295	}
	296
	297	static inline void oe_set_delta_child(struct packing_data *pack,
	298	struct object_entry *e,
	299	struct object_entry *delta)
	300	{
	301	if (delta)
	302	e->delta_child_idx = (delta - pack->objects) + 1;
	303	else
	304	e->delta_child_idx = 0;
	305	}
	306
	307	static inline struct object_entry *oe_delta_sibling(
	308	const struct packing_data *pack,
	309	const struct object_entry *e)
	310	{
	311	if (e->delta_sibling_idx)
	312	return &pack->objects[e->delta_sibling_idx - 1];
	313	return NULL;
	314	}
	315
	316	static inline void oe_set_delta_sibling(struct packing_data *pack,
	317	struct object_entry *e,
	318	struct object_entry *delta)
	319	{
	320	if (delta)
	321	e->delta_sibling_idx = (delta - pack->objects) + 1;
	322	else
	323	e->delta_sibling_idx = 0;
	324	}
	325
ac77d0c3 NTND	326	unsigned long oe_get_size_slow(struct packing_data *pack,
	327	const struct object_entry *e);
	328	static inline unsigned long oe_size(struct packing_data *pack,
	329	const struct object_entry *e)
	330	{
	331	if (e->size_valid)
	332	return e->size_;
	333
	334	return oe_get_size_slow(pack, e);
	335	}
	336
	337	static inline int oe_size_less_than(struct packing_data *pack,
	338	const struct object_entry *lhs,
	339	unsigned long rhs)
	340	{
	341	if (lhs->size_valid)
	342	return lhs->size_ < rhs;
	343	if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
	344	return 0;
	345	return oe_get_size_slow(pack, lhs) < rhs;
	346	}
	347
	348	static inline int oe_size_greater_than(struct packing_data *pack,
	349	const struct object_entry *lhs,
	350	unsigned long rhs)
	351	{
	352	if (lhs->size_valid)
	353	return lhs->size_ > rhs;
	354	if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
	355	return 1;
	356	return oe_get_size_slow(pack, lhs) > rhs;
	357	}
	358
	359	static inline void oe_set_size(struct packing_data *pack,
	360	struct object_entry *e,
	361	unsigned long size)
	362	{
	363	if (size < pack->oe_size_limit) {
	364	e->size_ = size;
	365	e->size_valid = 1;
	366	} else {
	367	e->size_valid = 0;
	368	if (oe_get_size_slow(pack, e) != size)
	369	BUG("'size' is supposed to be the object size!");
	370	}
	371	}
	372
0aca34e8 NTND	373	static inline unsigned long oe_delta_size(struct packing_data *pack,
	374	const struct object_entry *e)
	375	{
	376	if (e->delta_size_valid)
	377	return e->delta_size_;
9ac3f0e5 NTND	378
9ac3f0e5 NTND	379	/*
ce498e09	380	* pack->delta_size[] can't be NULL because oe_set_delta_size()
9ac3f0e5 NTND	381	* must have been called when a new delta is saved with
	382	* oe_set_delta().
	383	* If oe_delta() returns NULL (i.e. default state, which means
	384	* delta_size_valid is also false), then the caller must never
	385	* call oe_delta_size().
	386	*/
	387	return pack->delta_size[e - pack->objects];
0aca34e8 NTND	388	}
	389
	390	static inline void oe_set_delta_size(struct packing_data *pack,
	391	struct object_entry *e,
	392	unsigned long size)
	393	{
9ac3f0e5 NTND	394	if (size < pack->oe_delta_size_limit) {
	395	e->delta_size_ = size;
	396	e->delta_size_valid = 1;
	397	} else {
	398	packing_data_lock(pack);
	399	if (!pack->delta_size)
	400	ALLOC_ARRAY(pack->delta_size, pack->nr_alloc);
	401	packing_data_unlock(pack);
	402
	403	pack->delta_size[e - pack->objects] = size;
	404	e->delta_size_valid = 0;
	405	}
0aca34e8 NTND	406	}
0aca34e8 NTND	407
108f5303 CC	408	static inline unsigned int oe_tree_depth(struct packing_data *pack,
	409	struct object_entry *e)
	410	{
	411	if (!pack->tree_depth)
	412	return 0;
	413	return pack->tree_depth[e - pack->objects];
	414	}
	415
	416	static inline void oe_set_tree_depth(struct packing_data *pack,
	417	struct object_entry *e,
	418	unsigned int tree_depth)
	419	{
	420	if (!pack->tree_depth)
e159b810	421	CALLOC_ARRAY(pack->tree_depth, pack->nr_alloc);
108f5303 CC	422	pack->tree_depth[e - pack->objects] = tree_depth;
	423	}
	424
fe0ac2fb CC	425	static inline unsigned char oe_layer(struct packing_data *pack,
	426	struct object_entry *e)
	427	{
	428	if (!pack->layer)
	429	return 0;
	430	return pack->layer[e - pack->objects];
	431	}
	432
	433	static inline void oe_set_layer(struct packing_data *pack,
	434	struct object_entry *e,
	435	unsigned char layer)
	436	{
	437	if (!pack->layer)
e159b810	438	CALLOC_ARRAY(pack->layer, pack->nr_alloc);
fe0ac2fb CC	439	pack->layer[e - pack->objects] = layer;
	440	}
	441
2834bc27	442	#endif