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#ifndef PACK_BITMAP_H
#define PACK_BITMAP_H
 
#include "ewah/ewok.h"
#include "khash.h"
#include "pack-objects.h"
 
struct bitmap_disk_entry {
	uint32_t object_pos;
	uint8_t xor_offset;
	uint8_t flags;
} __attribute__((packed));
 
struct bitmap_disk_header {
	char magic[4];
	uint16_t version;
	uint16_t options;
	uint32_t entry_count;
	unsigned char checksum[20];
};
 
static const char BITMAP_IDX_SIGNATURE[] = {'B', 'I', 'T', 'M'};
 
#define NEEDS_BITMAP (1u<<22)
 
enum pack_bitmap_opts {
	BITMAP_OPT_FULL_DAG = 1
};
 
enum pack_bitmap_flags {
	BITMAP_FLAG_REUSE = 0x1
};
 
typedef int (*show_reachable_fn)(
	const unsigned char *sha1,
	enum object_type type,
	int flags,
	uint32_t hash,
	struct packed_git *found_pack,
	off_t found_offset);
 
int prepare_bitmap_git(void);
void count_bitmap_commit_list(uint32_t *commits, uint32_t *trees, uint32_t *blobs, uint32_t *tags);
void traverse_bitmap_commit_list(show_reachable_fn show_reachable);
void test_bitmap_walk(struct rev_info *revs);
char *pack_bitmap_filename(struct packed_git *p);
int prepare_bitmap_walk(struct rev_info *revs);
int reuse_partial_packfile_from_bitmap(struct packed_git **packfile, uint32_t *entries, off_t *up_to);
int rebuild_existing_bitmaps(struct packing_data *mapping, khash_sha1 *reused_bitmaps, int show_progress);
 
void bitmap_writer_show_progress(int show);
void bitmap_writer_set_checksum(unsigned char *sha1);
void bitmap_writer_build_type_index(struct pack_idx_entry **index, uint32_t index_nr);
void bitmap_writer_reuse_bitmaps(struct packing_data *to_pack);
void bitmap_writer_select_commits(struct commit **indexed_commits,
		unsigned int indexed_commits_nr, int max_bitmaps);
void bitmap_writer_build(struct packing_data *to_pack);
void bitmap_writer_finish(struct pack_idx_entry **index,
			  uint32_t index_nr,
			  const char *filename);
 
#endif