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#ifndef PACK_OBJECTS_H
#define PACK_OBJECTS_H

#define OE_DFS_STATE_BITS	2
#define OE_DEPTH_BITS		12
#define OE_IN_PACK_BITS		14
#define OE_Z_DELTA_BITS		16

/*
 * 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.
 *
 * "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;
	/* object uncompressed size _if_ size_valid is true */
	uint32_t size_;
	unsigned size_valid:1;
	unsigned in_pack_idx:OE_IN_PACK_BITS;	/* already in pack */
	off_t in_pack_offset;
	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
				     */
	void *delta_data;	/* cached delta (uncompressed) */
	unsigned long delta_size;	/* delta data size (uncompressed) */
	unsigned z_delta_size:OE_Z_DELTA_BITS;
	unsigned type_:TYPE_BITS;
	unsigned in_pack_type:TYPE_BITS; /* could be delta */
	unsigned type_valid:1;
	uint32_t hash;			/* name hint hash */
	unsigned char in_pack_header_size;
	unsigned preferred_base:1; /*
				    * we do not pack this, but is available
				    * to be used as the base object to delta
				    * objects against.
				    */
	unsigned no_try_delta:1;
	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;
};

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;
	int in_pack_count;
	struct packed_git *in_pack[1 << OE_IN_PACK_BITS];
};

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)
		die("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 unsigned int oe_add_pack(struct packing_data *pack,
				       struct packed_git *p)
{
	if (pack->in_pack_count >= (1 << OE_IN_PACK_BITS))
		die(_("too many packs to handle in one go. "
		      "Please add .keep files to exclude\n"
		      "some pack files and keep the number "
		      "of non-kept files below %d."),
		    1 << OE_IN_PACK_BITS);
	if (p) {
		if (p->index > 0)
			die("BUG: this packed is already indexed");
		p->index = pack->in_pack_count;
	}
	pack->in_pack[pack->in_pack_count] = p;
	return pack->in_pack_count++;
}

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

}

static inline void oe_set_in_pack(struct object_entry *e,
				  struct packed_git *p)
{
	if (p->index <= 0)
		die("BUG: found_pack should be NULL "
		    "instead of having non-positive index");
	e->in_pack_idx = p->index;

}

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

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;
}

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;
}

static inline unsigned long oe_size(const struct object_entry *e)
{
	if (e->size_valid) {
		return e->size_;
	} else {
		unsigned long size;

		sha1_object_info(e->idx.oid.hash, &size);
		return size;
	}
}

static inline int contains_in_32bits(unsigned long limit)
{
	uint32_t truncated_limit = (uint32_t)limit;

	return limit == truncated_limit;
}

static inline int oe_size_less_than(const struct object_entry *e,
				    unsigned long limit)
{
	if (e->size_valid)
		return e->size_ < limit;
	if (contains_in_32bits(limit))
		return 1;
	return oe_size(e) < limit;
}

static inline int oe_size_greater_than(const struct object_entry *e,
				       unsigned long limit)
{
	if (e->size_valid)
		return e->size_ > limit;
	if (contains_in_32bits(limit))
		return 0;
	return oe_size(e) > limit;
}

static inline void oe_set_size(struct object_entry *e,
			       unsigned long size)
{
	e->size_ = size;
	e->size_valid = e->size_ == size;
}

#endif
debug log:

solving 9a4ed7fdbe ...
found 9a4ed7fdbe in https://public-inbox.org/git/20180317141033.21545-10-pclouds@gmail.com/
found 63222a76b0 in https://public-inbox.org/git/20180317141033.21545-9-pclouds@gmail.com/
found 0b831c8f12 in https://public-inbox.org/git/20180317141033.21545-8-pclouds@gmail.com/
found 933f71a86b in https://public-inbox.org/git/20180317141033.21545-7-pclouds@gmail.com/
found b832ee2b5e in https://public-inbox.org/git/20180317141033.21545-6-pclouds@gmail.com/
found a4d8d29c04 in https://public-inbox.org/git/20180317141033.21545-5-pclouds@gmail.com/
found 4c6b73a4d6 in https://public-inbox.org/git/20180317141033.21545-4-pclouds@gmail.com/
found 5f568b609c in https://public-inbox.org/git/20180317141033.21545-3-pclouds@gmail.com/
found de91edd264 in https://public-inbox.org/git/20180317141033.21545-2-pclouds@gmail.com/
found 03f1191659 in https://80x24.org/mirrors/git.git
preparing index
index prepared:
100644 03f1191659dab55b2c4c440c347101a3cdbd4650	pack-objects.h

applying [1/9] https://public-inbox.org/git/20180317141033.21545-2-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index 03f1191659..de91edd264 100644


applying [2/9] https://public-inbox.org/git/20180317141033.21545-3-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index de91edd264..5f568b609c 100644


applying [3/9] https://public-inbox.org/git/20180317141033.21545-4-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index 5f568b609c..4c6b73a4d6 100644


applying [4/9] https://public-inbox.org/git/20180317141033.21545-5-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index 4c6b73a4d6..a4d8d29c04 100644


applying [5/9] https://public-inbox.org/git/20180317141033.21545-6-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index a4d8d29c04..b832ee2b5e 100644


applying [6/9] https://public-inbox.org/git/20180317141033.21545-7-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index b832ee2b5e..933f71a86b 100644


applying [7/9] https://public-inbox.org/git/20180317141033.21545-8-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index 933f71a86b..0b831c8f12 100644


applying [8/9] https://public-inbox.org/git/20180317141033.21545-9-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index 0b831c8f12..63222a76b0 100644


applying [9/9] https://public-inbox.org/git/20180317141033.21545-10-pclouds@gmail.com/
diff --git a/pack-objects.h b/pack-objects.h
index 63222a76b0..9a4ed7fdbe 100644

Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.
Checking patch pack-objects.h...
Applied patch pack-objects.h cleanly.

index at:
100644 fa2c15bee998d4063a05095a6c40a0920efd6747	pack-objects.h

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