2007-11-25 19:42:40 +00:00
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/* copyright (c) 2007 magnus auvinen, see licence.txt for more info */
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2007-08-22 07:52:33 +00:00
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#ifndef ENGINE_SNAPSHOT_H
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#define ENGINE_SNAPSHOT_H
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2007-05-22 15:03:32 +00:00
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2008-08-14 17:19:13 +00:00
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#include <base/system.h>
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/* CSnapshot */
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2007-08-22 07:52:33 +00:00
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2009-10-27 14:38:53 +00:00
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class CSnapshotItem
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{
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public:
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int m_TypeAndID;
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int *Data() { return (int *)(this+1); }
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int Type() { return m_TypeAndID>>16; }
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int ID() { return m_TypeAndID&0xffff; }
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int Key() { return m_TypeAndID; }
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2007-08-22 07:52:33 +00:00
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};
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class CSnapshotDelta
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{
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public:
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int m_NumDeletedItems;
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int m_NumUpdateItems;
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int m_NumTempItems; /* needed? */
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int m_pData[1];
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};
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2007-08-22 07:52:33 +00:00
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2009-10-27 14:38:53 +00:00
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// TODO: hide a lot of these members
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class CSnapshot
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{
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public:
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enum
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{
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MAX_SIZE=64*1024
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};
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int m_DataSize;
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int m_NumItems;
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int *Offsets() const { return (int *)(this+1); }
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char *DataStart() const { return (char*)(Offsets()+m_NumItems); }
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CSnapshotItem *GetItem(int Index);
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int GetItemSize(int Index);
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int GetItemIndex(int Key);
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int Crc();
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void DebugDump();
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// TODO: move these
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int GetItemIndexHashed(int Key);
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int GenerateHash();
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//
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static CSnapshotDelta *EmptyDelta();
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static int CreateDelta(CSnapshot *pFrom, CSnapshot *pTo, void *pData);
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static int UnpackDelta(CSnapshot *pFrom, CSnapshot *pTo, void *pData, int DataSize);
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};
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/* CSnapshotStorage */
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class CSnapshotStorage
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{
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public:
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class CHolder
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{
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public:
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CHolder *m_pPrev;
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CHolder *m_pNext;
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int64 m_Tagtime;
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int m_Tick;
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int m_SnapSize;
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CSnapshot *m_pSnap;
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CSnapshot *m_pAltSnap;
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};
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CHolder *m_pFirst;
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CHolder *m_pLast;
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void Init();
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void PurgeAll();
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void PurgeUntil(int Tick);
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void Add(int Tick, int64 Tagtime, int DataSize, void *pData, int CreateAlt);
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int Get(int Tick, int64 *Tagtime, CSnapshot **pData, CSnapshot **ppAltData);
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};
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class CSnapshotBuilder
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{
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enum
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{
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MAX_ITEMS = 1024*2
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};
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char m_aData[CSnapshot::MAX_SIZE];
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int m_DataSize;
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int m_aOffsets[MAX_ITEMS];
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int m_NumItems;
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public:
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void Init();
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void *NewItem(int Type, int ID, int Size);
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CSnapshotItem *GetItem(int Index);
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int *GetItemData(int Key);
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int Finish(void *Snapdata);
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2007-05-22 15:03:32 +00:00
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};
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2007-07-13 13:40:04 +00:00
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2007-08-22 07:52:33 +00:00
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#endif /* ENGINE_SNAPSHOT_H */
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