[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"

#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 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;

	pthread_mutex_t lock;
	pthread_mutex_t read_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 packing_data *pdata);

static inline void packing_data_lock(struct packing_data *pdata)
{
	pthread_mutex_lock(&pdata->lock);
}
static inline void packing_data_unlock(struct packing_data *pdata)
{
	pthread_mutex_unlock(&pdata->lock);
}

static inline void packing_data_read_lock(struct packing_data *pdata)
{
	pthread_mutex_lock(&pdata->read_lock);
}
static inline void packing_data_read_unlock(struct packing_data *pdata)
{
	pthread_mutex_unlock(&pdata->read_lock);
}

struct object_entry *packlist_alloc(struct packing_data *pdata,
				    const unsigned char *sha1,
				    uint32_t index_pos);

struct object_entry *packlist_find(struct packing_data *pdata,
				   const unsigned char *sha1,
				   uint32_t *index_pos);

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,
		     struct packed_git *p);
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, p);
	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
9806f5a7 NTND	8	#define DEFAULT_DELTA_CACHE_SIZE (256 * 1024 * 1024)
9806f5a7 NTND	9
0c6804ab	10	#define OE_DFS_STATE_BITS 2
b5c0cbd8	11	#define OE_DEPTH_BITS 12
43fa44fa	12	#define OE_IN_PACK_BITS 10
0cb3c142	13	#define OE_Z_DELTA_BITS 20
ac77d0c3 NTND	14	/*
	15	* Note that oe_set_size() becomes expensive when the given size is
	16	* above this limit. Don't lower it too much.
	17	*/
	18	#define OE_SIZE_BITS 31
9ac3f0e5	19	#define OE_DELTA_SIZE_BITS 23
0c6804ab NTND	20
	21	/*
	22	* State flags for depth-first search used for analyzing delta cycles.
	23	*
	24	* The depth is measured in delta-links to the base (so if A is a delta
	25	* against B, then A has a depth of 1, and B a depth of 0).
	26	*/
	27	enum dfs_state {
	28	DFS_NONE = 0,
	29	DFS_ACTIVE,
	30	DFS_DONE,
	31	DFS_NUM_STATES
	32	};
	33
8d6ccce1	34	/*
3b13a5f2 NTND	35	* The size of struct nearly determines pack-objects's memory
	36	* consumption. This struct is packed tight for that reason. When you
	37	* add or reorder something in this struct, think a bit about this.
	38	*
8d6ccce1 NTND	39	* basic object info
	40	* -----------------
	41	* idx.oid is filled up before delta searching starts. idx.crc32 is
	42	* only valid after the object is written out and will be used for
	43	* generating the index. idx.offset will be both gradually set and
	44	* used in writing phase (base objects get offset first, then deltas
	45	* refer to them)
	46	*
	47	* "size" is the uncompressed object size. Compressed size of the raw
	48	* data for an object in a pack is not stored anywhere but is computed
27a7d067 NTND	49	* and made available when reverse .idx is made. Note that when a
	50	* delta is reused, "size" is the uncompressed _delta_ size, not the
	51	* canonical one after the delta has been applied.
8d6ccce1 NTND	52	*
	53	* "hash" contains a path name hash which is used for sorting the
	54	* delta list and also during delta searching. Once prepare_pack()
	55	* returns it's no longer needed.
	56	*
	57	* source pack info
	58	* ----------------
	59	* The (in_pack, in_pack_offset) tuple contains the location of the
	60	* object in the source pack. in_pack_header_size allows quickly
	61	* skipping the header and going straight to the zlib stream.
	62	*
	63	* "type" and "in_pack_type" both describe object type. in_pack_type
	64	* may contain a delta type, while type is always the canonical type.
	65	*
	66	* deltas
	67	* ------
	68	* Delta links (delta, delta_child and delta_sibling) are created to
	69	* reflect that delta graph from the source pack then updated or added
	70	* during delta searching phase when we find better deltas.
	71	*
	72	* delta_child and delta_sibling are last needed in
	73	* compute_write_order(). "delta" and "delta_size" must remain valid
	74	* at object writing phase in case the delta is not cached.
	75	*
	76	* If a delta is cached in memory and is compressed, delta_data points
	77	* to the data and z_delta_size contains the compressed size. If it's
	78	* uncompressed [1], z_delta_size must be zero. delta_size is always
	79	* the uncompressed size and must be valid even if the delta is not
	80	* cached.
	81	*
	82	* [1] during try_delta phase we don't bother with compressing because
	83	* the delta could be quickly replaced with a better one.
	84	*/
2834bc27 VM	85	struct object_entry {
2834bc27 VM	86	struct pack_idx_entry idx;
2834bc27	87	void delta_data; / cached delta (uncompressed) */
3b13a5f2	88	off_t in_pack_offset;
2834bc27	89	uint32_t hash; /* name hint hash */
ac77d0c3 NTND	90	unsigned size_:OE_SIZE_BITS;
ac77d0c3 NTND	91	unsigned size_valid:1;
898eba5e NTND	92	uint32_t delta_idx; /* delta base object */
	93	uint32_t delta_child_idx; /* deltified objects who bases me */
	94	uint32_t delta_sibling_idx; /* other deltified objects who
	95	* uses the same base as me
	96	*/
0aca34e8 NTND	97	unsigned delta_size_:OE_DELTA_SIZE_BITS; /* delta data size (uncompressed) */
0aca34e8 NTND	98	unsigned delta_size_valid:1;
9ac3f0e5	99	unsigned char in_pack_header_size;
3b13a5f2	100	unsigned in_pack_idx:OE_IN_PACK_BITS; /* already in pack */
0cb3c142	101	unsigned z_delta_size:OE_Z_DELTA_BITS;
3b13a5f2	102	unsigned type_valid:1;
3b13a5f2	103	unsigned no_try_delta:1;
9ac3f0e5	104	unsigned type_:TYPE_BITS;
fd9b1bae	105	unsigned in_pack_type:TYPE_BITS; /* could be delta */
c8d521fa	106
2834bc27 VM	107	unsigned preferred_base:1; /*
	108	* we do not pack this, but is available
	109	* to be used as the base object to delta
	110	* objects against.
	111	*/
2834bc27 VM	112	unsigned tagged:1; /* near the very tip of refs */
2834bc27 VM	113	unsigned filled:1; /* assigned write-order */
0c6804ab	114	unsigned dfs_state:OE_DFS_STATE_BITS;
b5c0cbd8	115	unsigned depth:OE_DEPTH_BITS;
6a1e32d5	116	unsigned ext_base:1; /* delta_idx points outside packlist */
4cf2143e JK	117
4cf2143e JK	118	/*
3b13a5f2	119	* pahole results on 64-bit linux (gcc and clang)
7dbabbbe	120	*
9ac3f0e5	121	* size: 80, bit_padding: 9 bits
3b13a5f2 NTND	122	*
	123	* and on 32-bit (gcc)
	124	*
9ac3f0e5	125	* size: 76, bit_padding: 9 bits
4cf2143e	126	*/
2834bc27 VM	127	};
	128
	129	struct packing_data {
	130	struct object_entry *objects;
	131	uint32_t nr_objects, nr_alloc;
	132
	133	int32_t *index;
	134	uint32_t index_size;
06af3bba NTND	135
06af3bba NTND	136	unsigned int *in_pack_pos;
9ac3f0e5	137	unsigned long *delta_size;
43fa44fa NTND	138
	139	/*
	140	* Only one of these can be non-NULL and they have different
	141	* sizes. if in_pack_by_idx is allocated, oe_in_pack() returns
	142	* the pack of an object using in_pack_idx field. If not,
	143	* in_pack[] array is used the same way as in_pack_pos[]
	144	*/
	145	struct packed_git **in_pack_by_idx;
	146	struct packed_git **in_pack;
ac77d0c3	147
9ac3f0e5	148	pthread_mutex_t lock;
459307b1	149	pthread_mutex_t read_lock;
9ac3f0e5	150
6a1e32d5 JK	151	/*
	152	* This list contains entries for bases which we know the other side
	153	* has (e.g., via reachability bitmaps), but which aren't in our
	154	* "objects" list.
	155	*/
	156	struct object_entry *ext_bases;
	157	uint32_t nr_ext, alloc_ext;
	158
ac77d0c3	159	uintmax_t oe_size_limit;
9ac3f0e5	160	uintmax_t oe_delta_size_limit;
108f5303 CC	161
	162	/* delta islands */
	163	unsigned int *tree_depth;
fe0ac2fb	164	unsigned char *layer;
2834bc27 VM	165	};
2834bc27 VM	166
43fa44fa	167	void prepare_packing_data(struct packing_data *pdata);
9ac3f0e5 NTND	168
	169	static inline void packing_data_lock(struct packing_data *pdata)
	170	{
9ac3f0e5	171	pthread_mutex_lock(&pdata->lock);
9ac3f0e5 NTND	172	}
	173	static inline void packing_data_unlock(struct packing_data *pdata)
	174	{
9ac3f0e5	175	pthread_mutex_unlock(&pdata->lock);
9ac3f0e5 NTND	176	}
9ac3f0e5 NTND	177
459307b1 PH	178	static inline void packing_data_read_lock(struct packing_data *pdata)
	179	{
	180	pthread_mutex_lock(&pdata->read_lock);
	181	}
	182	static inline void packing_data_read_unlock(struct packing_data *pdata)
	183	{
	184	pthread_mutex_unlock(&pdata->read_lock);
	185	}
	186
2834bc27 VM	187	struct object_entry packlist_alloc(struct packing_data pdata,
	188	const unsigned char *sha1,
	189	uint32_t index_pos);
	190
	191	struct object_entry packlist_find(struct packing_data pdata,
	192	const unsigned char *sha1,
	193	uint32_t *index_pos);
	194
68fb36eb VM	195	static inline uint32_t pack_name_hash(const char *name)
	196	{
	197	uint32_t c, hash = 0;
	198
	199	if (!name)
	200	return 0;
	201
	202	/*
	203	* This effectively just creates a sortable number from the
	204	* last sixteen non-whitespace characters. Last characters
	205	* count "most", so things that end in ".c" sort together.
	206	*/
	207	while ((c = *name++) != 0) {
	208	if (isspace(c))
	209	continue;
	210	hash = (hash >> 2) + (c << 24);
	211	}
	212	return hash;
	213	}
	214
fd9b1bae NTND	215	static inline enum object_type oe_type(const struct object_entry *e)
	216	{
	217	return e->type_valid ? e->type_ : OBJ_BAD;
	218	}
	219
	220	static inline void oe_set_type(struct object_entry *e,
	221	enum object_type type)
	222	{
	223	if (type >= OBJ_ANY)
	224	BUG("OBJ_ANY cannot be set in pack-objects code");
	225
	226	e->type_valid = type >= OBJ_NONE;
	227	e->type_ = (unsigned)type;
	228	}
	229
06af3bba NTND	230	static inline unsigned int oe_in_pack_pos(const struct packing_data *pack,
	231	const struct object_entry *e)
	232	{
	233	return pack->in_pack_pos[e - pack->objects];
	234	}
	235
	236	static inline void oe_set_in_pack_pos(const struct packing_data *pack,
	237	const struct object_entry *e,
	238	unsigned int pos)
	239	{
	240	pack->in_pack_pos[e - pack->objects] = pos;
	241	}
	242
43fa44fa NTND	243	static inline struct packed_git oe_in_pack(const struct packing_data pack,
	244	const struct object_entry *e)
	245	{
	246	if (pack->in_pack_by_idx)
	247	return pack->in_pack_by_idx[e->in_pack_idx];
	248	else
	249	return pack->in_pack[e - pack->objects];
	250	}
	251
	252	void oe_map_new_pack(struct packing_data *pack,
	253	struct packed_git *p);
	254	static inline void oe_set_in_pack(struct packing_data *pack,
	255	struct object_entry *e,
	256	struct packed_git *p)
	257	{
	258	if (!p->index)
	259	oe_map_new_pack(pack, p);
	260	if (pack->in_pack_by_idx)
	261	e->in_pack_idx = p->index;
	262	else
	263	pack->in_pack[e - pack->objects] = p;
	264	}
	265
898eba5e NTND	266	static inline struct object_entry *oe_delta(
	267	const struct packing_data *pack,
	268	const struct object_entry *e)
	269	{
6a1e32d5 JK	270	if (!e->delta_idx)
	271	return NULL;
	272	if (e->ext_base)
	273	return &pack->ext_bases[e->delta_idx - 1];
	274	else
898eba5e	275	return &pack->objects[e->delta_idx - 1];
898eba5e NTND	276	}
	277
	278	static inline void oe_set_delta(struct packing_data *pack,
	279	struct object_entry *e,
	280	struct object_entry *delta)
	281	{
	282	if (delta)
	283	e->delta_idx = (delta - pack->objects) + 1;
	284	else
	285	e->delta_idx = 0;
	286	}
	287
6a1e32d5 JK	288	void oe_set_delta_ext(struct packing_data *pack,
	289	struct object_entry *e,
	290	const unsigned char *sha1);
	291
898eba5e NTND	292	static inline struct object_entry *oe_delta_child(
	293	const struct packing_data *pack,
	294	const struct object_entry *e)
	295	{
	296	if (e->delta_child_idx)
	297	return &pack->objects[e->delta_child_idx - 1];
	298	return NULL;
	299	}
	300
	301	static inline void oe_set_delta_child(struct packing_data *pack,
	302	struct object_entry *e,
	303	struct object_entry *delta)
	304	{
	305	if (delta)
	306	e->delta_child_idx = (delta - pack->objects) + 1;
	307	else
	308	e->delta_child_idx = 0;
	309	}
	310
	311	static inline struct object_entry *oe_delta_sibling(
	312	const struct packing_data *pack,
	313	const struct object_entry *e)
	314	{
	315	if (e->delta_sibling_idx)
	316	return &pack->objects[e->delta_sibling_idx - 1];
	317	return NULL;
	318	}
	319
	320	static inline void oe_set_delta_sibling(struct packing_data *pack,
	321	struct object_entry *e,
	322	struct object_entry *delta)
	323	{
	324	if (delta)
	325	e->delta_sibling_idx = (delta - pack->objects) + 1;
	326	else
	327	e->delta_sibling_idx = 0;
	328	}
	329
ac77d0c3 NTND	330	unsigned long oe_get_size_slow(struct packing_data *pack,
	331	const struct object_entry *e);
	332	static inline unsigned long oe_size(struct packing_data *pack,
	333	const struct object_entry *e)
	334	{
	335	if (e->size_valid)
	336	return e->size_;
	337
	338	return oe_get_size_slow(pack, e);
	339	}
	340
	341	static inline int oe_size_less_than(struct packing_data *pack,
	342	const struct object_entry *lhs,
	343	unsigned long rhs)
	344	{
	345	if (lhs->size_valid)
	346	return lhs->size_ < rhs;
	347	if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
	348	return 0;
	349	return oe_get_size_slow(pack, lhs) < rhs;
	350	}
	351
	352	static inline int oe_size_greater_than(struct packing_data *pack,
	353	const struct object_entry *lhs,
	354	unsigned long rhs)
	355	{
	356	if (lhs->size_valid)
	357	return lhs->size_ > rhs;
	358	if (rhs < pack->oe_size_limit) /* rhs < 2^x <= lhs ? */
	359	return 1;
	360	return oe_get_size_slow(pack, lhs) > rhs;
	361	}
	362
	363	static inline void oe_set_size(struct packing_data *pack,
	364	struct object_entry *e,
	365	unsigned long size)
	366	{
	367	if (size < pack->oe_size_limit) {
	368	e->size_ = size;
	369	e->size_valid = 1;
	370	} else {
	371	e->size_valid = 0;
	372	if (oe_get_size_slow(pack, e) != size)
	373	BUG("'size' is supposed to be the object size!");
	374	}
	375	}
	376
0aca34e8 NTND	377	static inline unsigned long oe_delta_size(struct packing_data *pack,
	378	const struct object_entry *e)
	379	{
	380	if (e->delta_size_valid)
	381	return e->delta_size_;
9ac3f0e5 NTND	382
9ac3f0e5 NTND	383	/*
ce498e09	384	* pack->delta_size[] can't be NULL because oe_set_delta_size()
9ac3f0e5 NTND	385	* must have been called when a new delta is saved with
	386	* oe_set_delta().
	387	* If oe_delta() returns NULL (i.e. default state, which means
	388	* delta_size_valid is also false), then the caller must never
	389	* call oe_delta_size().
	390	*/
	391	return pack->delta_size[e - pack->objects];
0aca34e8 NTND	392	}
	393
	394	static inline void oe_set_delta_size(struct packing_data *pack,
	395	struct object_entry *e,
	396	unsigned long size)
	397	{
9ac3f0e5 NTND	398	if (size < pack->oe_delta_size_limit) {
	399	e->delta_size_ = size;
	400	e->delta_size_valid = 1;
	401	} else {
	402	packing_data_lock(pack);
	403	if (!pack->delta_size)
	404	ALLOC_ARRAY(pack->delta_size, pack->nr_alloc);
	405	packing_data_unlock(pack);
	406
	407	pack->delta_size[e - pack->objects] = size;
	408	e->delta_size_valid = 0;
	409	}
0aca34e8 NTND	410	}
0aca34e8 NTND	411
108f5303 CC	412	static inline unsigned int oe_tree_depth(struct packing_data *pack,
	413	struct object_entry *e)
	414	{
	415	if (!pack->tree_depth)
	416	return 0;
	417	return pack->tree_depth[e - pack->objects];
	418	}
	419
	420	static inline void oe_set_tree_depth(struct packing_data *pack,
	421	struct object_entry *e,
	422	unsigned int tree_depth)
	423	{
	424	if (!pack->tree_depth)
e159b810	425	CALLOC_ARRAY(pack->tree_depth, pack->nr_alloc);
108f5303 CC	426	pack->tree_depth[e - pack->objects] = tree_depth;
	427	}
	428
fe0ac2fb CC	429	static inline unsigned char oe_layer(struct packing_data *pack,
	430	struct object_entry *e)
	431	{
	432	if (!pack->layer)
	433	return 0;
	434	return pack->layer[e - pack->objects];
	435	}
	436
	437	static inline void oe_set_layer(struct packing_data *pack,
	438	struct object_entry *e,
	439	unsigned char layer)
	440	{
	441	if (!pack->layer)
e159b810	442	CALLOC_ARRAY(pack->layer, pack->nr_alloc);
fe0ac2fb CC	443	pack->layer[e - pack->objects] = layer;
	444	}
	445
2834bc27	446	#endif