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93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
/* copyright (c) 2007 magnus auvinen, see licence.txt for more info */
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#ifndef ENGINE_SNAPSHOT_H
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#define ENGINE_SNAPSHOT_H
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#include "e_system.h"
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/* SNAPSHOT */
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enum
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{
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MAX_SNAPSHOT_SIZE=64*1024
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};
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typedef struct
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{
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int type_and_id;
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} SNAPSHOT_ITEM;
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typedef struct
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{
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int data_size;
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int num_items;
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} SNAPSHOT;
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int *snapitem_data(SNAPSHOT_ITEM *item);
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int snapitem_type(SNAPSHOT_ITEM *item);
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int snapitem_id(SNAPSHOT_ITEM *item);
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int snapitem_key(SNAPSHOT_ITEM *item);
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int *snapshot_offsets(SNAPSHOT *snap);
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char *snapshot_datastart(SNAPSHOT *snap);
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SNAPSHOT_ITEM *snapshot_get_item(SNAPSHOT *snap, int index);
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int snapshot_get_item_datasize(SNAPSHOT *snap, int index);
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int snapshot_get_item_index(SNAPSHOT *snap, int key);
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void *snapshot_empty_delta();
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int snapshot_crc(SNAPSHOT *snap);
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void snapshot_debug_dump(SNAPSHOT *snap);
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int snapshot_create_delta(SNAPSHOT *from, SNAPSHOT *to, void *data);
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int snapshot_unpack_delta(SNAPSHOT *from, SNAPSHOT *to, void *data, int data_size);
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/* SNAPSTORAGE */
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typedef struct SNAPSTORAGE_HOLDER_t
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{
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struct SNAPSTORAGE_HOLDER_t *prev;
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struct SNAPSTORAGE_HOLDER_t *next;
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int64 tagtime;
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int tick;
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int snap_size;
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SNAPSHOT *snap;
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SNAPSHOT *alt_snap;
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} SNAPSTORAGE_HOLDER;
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typedef struct SNAPSTORAGE_t
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{
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SNAPSTORAGE_HOLDER *first;
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SNAPSTORAGE_HOLDER *last;
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} SNAPSTORAGE;
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void snapstorage_init(SNAPSTORAGE *ss);
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void snapstorage_purge_all(SNAPSTORAGE *ss);
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void snapstorage_purge_until(SNAPSTORAGE *ss, int tick);
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void snapstorage_add(SNAPSTORAGE *ss, int tick, int64 tagtime, int data_size, void *data, int create_alt);
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int snapstorage_get(SNAPSTORAGE *ss, int tick, int64 *tagtime, SNAPSHOT **data, SNAPSHOT **alt_data);
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/* SNAPBUILD */
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enum
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{
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SNAPBUILD_MAX_ITEMS = 1024*2
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};
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typedef struct SNAPBUILD
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{
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char data[MAX_SNAPSHOT_SIZE];
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int data_size;
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int offsets[SNAPBUILD_MAX_ITEMS];
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int num_items;
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} SNAPBUILD;
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void snapbuild_init(SNAPBUILD *sb);
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SNAPSHOT_ITEM *snapbuild_get_item(SNAPBUILD *sb, int index);
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int *snapbuild_get_item_data(SNAPBUILD *sb, int key);
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int snapbuild_finish(SNAPBUILD *sb, void *snapdata);
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void *snapbuild_new_item(SNAPBUILD *sb, int type, int id, int size);
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#endif /* ENGINE_SNAPSHOT_H */
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