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#ifndef ENGINE_SNAPSHOT_H
#define ENGINE_SNAPSHOT_H
#include "system.h"
/* SNAPSHOT */
enum
{
MAX_SNAPSHOT_SIZE=64*1024
};
typedef struct
{
int type_and_id;
} SNAPSHOT_ITEM;
typedef struct
{
int data_size;
int num_items;
} SNAPSHOT;
int *snapitem_data(SNAPSHOT_ITEM *item);
int snapitem_type(SNAPSHOT_ITEM *item);
int snapitem_id(SNAPSHOT_ITEM *item);
int snapitem_key(SNAPSHOT_ITEM *item);
int *snapshot_offsets(SNAPSHOT *snap);
char *snapshot_datastart(SNAPSHOT *snap);
SNAPSHOT_ITEM *snapshot_get_item(SNAPSHOT *snap, int index);
int snapshot_get_item_datasize(SNAPSHOT *snap, int index);
int snapshot_get_item_index(SNAPSHOT *snap, int key);
void *snapshot_empty_delta();
int snapshot_crc(SNAPSHOT *snap);
void snapshot_debug_dump(SNAPSHOT *snap);
int snapshot_create_delta(SNAPSHOT *from, SNAPSHOT *to, void *data);
int snapshot_unpack_delta(SNAPSHOT *from, SNAPSHOT *to, void *data, int data_size);
/* SNAPSTORAGE */
typedef struct SNAPSTORAGE_HOLDER_t
{
struct SNAPSTORAGE_HOLDER_t *prev;
struct SNAPSTORAGE_HOLDER_t *next;
int64 tagtime;
int tick;
int snap_size;
SNAPSHOT *snap;
} SNAPSTORAGE_HOLDER;
typedef struct SNAPSTORAGE_t
{
SNAPSTORAGE_HOLDER *first;
SNAPSTORAGE_HOLDER *last;
} SNAPSTORAGE;
void snapstorage_init(SNAPSTORAGE *ss);
void snapstorage_purge_all(SNAPSTORAGE *ss);
void snapstorage_purge_until(SNAPSTORAGE *ss, int tick);
void snapstorage_add(SNAPSTORAGE *ss, int tick, int64 tagtime, int data_size, void *data);
int snapstorage_get(SNAPSTORAGE *ss, int tick, int64 *tagtime, SNAPSHOT **data);
/* SNAPBUILD */
enum
{
SNAPBUILD_MAX_ITEMS = 512
};
typedef struct SNAPBUILD
{
char data[MAX_SNAPSHOT_SIZE];
int data_size;
int offsets[SNAPBUILD_MAX_ITEMS];
int num_items;
} SNAPBUILD;
void snapbuild_init(SNAPBUILD *sb);
SNAPSHOT_ITEM *snapbuild_get_item(SNAPBUILD *sb, int index);
int *snapbuild_get_item_data(SNAPBUILD *sb, int key);
int snapbuild_finish(SNAPBUILD *sb, void *snapdata);
void *snapbuild_new_item(SNAPBUILD *sb, int type, int id, int size);
#endif /* ENGINE_SNAPSHOT_H */
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