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/* copyright (c) 2007 magnus auvinen, see licence.txt for more info */
#ifndef ENGINE_SNAPSHOT_H
#define ENGINE_SNAPSHOT_H
#include <base/system.h>
/* CSnapshot */
class CSnapshotItem
{
public:
int m_TypeAndID;
int *Data() { return (int *)(this+1); }
int Type() { return m_TypeAndID>>16; }
int ID() { return m_TypeAndID&0xffff; }
int Key() { return m_TypeAndID; }
};
class CSnapshotDelta
{
public:
int m_NumDeletedItems;
int m_NumUpdateItems;
int m_NumTempItems; /* needed? */
int m_pData[1];
};
// TODO: hide a lot of these members
class CSnapshot
{
public:
enum
{
MAX_SIZE=64*1024
};
int m_DataSize;
int m_NumItems;
int *Offsets() const { return (int *)(this+1); }
char *DataStart() const { return (char*)(Offsets()+m_NumItems); }
CSnapshotItem *GetItem(int Index);
int GetItemSize(int Index);
int GetItemIndex(int Key);
int Crc();
void DebugDump();
// TODO: move these
int GetItemIndexHashed(int Key);
int GenerateHash();
//
static CSnapshotDelta *EmptyDelta();
static int CreateDelta(CSnapshot *pFrom, CSnapshot *pTo, void *pData);
static int UnpackDelta(CSnapshot *pFrom, CSnapshot *pTo, void *pData, int DataSize);
};
/* CSnapshotStorage */
class CSnapshotStorage
{
public:
class CHolder
{
public:
CHolder *m_pPrev;
CHolder *m_pNext;
int64 m_Tagtime;
int m_Tick;
int m_SnapSize;
CSnapshot *m_pSnap;
CSnapshot *m_pAltSnap;
};
CHolder *m_pFirst;
CHolder *m_pLast;
void Init();
void PurgeAll();
void PurgeUntil(int Tick);
void Add(int Tick, int64 Tagtime, int DataSize, void *pData, int CreateAlt);
int Get(int Tick, int64 *Tagtime, CSnapshot **pData, CSnapshot **ppAltData);
};
class CSnapshotBuilder
{
enum
{
MAX_ITEMS = 1024*2
};
char m_aData[CSnapshot::MAX_SIZE];
int m_DataSize;
int m_aOffsets[MAX_ITEMS];
int m_NumItems;
public:
void Init();
void *NewItem(int Type, int ID, int Size);
CSnapshotItem *GetItem(int Index);
int *GetItemData(int Key);
int Finish(void *Snapdata);
};
#endif /* ENGINE_SNAPSHOT_H */
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