ddnet/src/engine/shared/snapshot.h

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/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com. */
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#ifndef ENGINE_SHARED_SNAPSHOT_H
#define ENGINE_SHARED_SNAPSHOT_H
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#include <base/system.h>
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// CSnapshot
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class CSnapshotItem
{
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public:
int m_TypeAndID;
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int *Data() { return (int *)(this+1); }
int Type() { return m_TypeAndID>>16; }
int ID() { return m_TypeAndID&0xffff; }
int Key() { return m_TypeAndID; }
};
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class CSnapshot
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{
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friend class CSnapshotBuilder;
int m_DataSize;
int m_NumItems;
int *Offsets() const { return (int *)(this+1); }
char *DataStart() const { return (char*)(Offsets()+m_NumItems); }
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public:
enum
{
OFFSET_UUID_TYPE=0x4000,
MAX_TYPE=0x7fff,
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MAX_SIZE=64*1024
};
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void Clear() { m_DataSize = 0; m_NumItems = 0; }
int NumItems() const { return m_NumItems; }
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CSnapshotItem *GetItem(int Index);
int GetItemSize(int Index);
int GetItemIndex(int Key);
int GetItemType(int Index);
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int Crc();
void DebugDump();
static void RemoveExtraInfo(unsigned char *pData);
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};
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// CSnapshotDelta
class CSnapshotDelta
{
public:
class CData
{
public:
int m_NumDeletedItems;
int m_NumUpdateItems;
int m_NumTempItems; // needed?
int m_pData[1];
};
private:
// TODO: strange arbitrary number
short m_aItemSizes[64];
int m_aSnapshotDataRate[0xffff];
int m_aSnapshotDataUpdates[0xffff];
int m_SnapshotCurrent;
CData m_Empty;
void UndiffItem(int *pPast, int *pDiff, int *pOut, int Size);
public:
CSnapshotDelta();
int GetDataRate(int Index) { return m_aSnapshotDataRate[Index]; }
int GetDataUpdates(int Index) { return m_aSnapshotDataUpdates[Index]; }
void SetStaticsize(int ItemType, int Size);
CData *EmptyDelta();
int CreateDelta(class CSnapshot *pFrom, class CSnapshot *pTo, void *pData);
int UnpackDelta(class CSnapshot *pFrom, class 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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public:
class CHolder
{
public:
CHolder *m_pPrev;
CHolder *m_pNext;
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int64 m_Tagtime;
int m_Tick;
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int m_SnapSize;
CSnapshot *m_pSnap;
CSnapshot *m_pAltSnap;
};
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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
{
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enum
{
MAX_ITEMS = 1024,
MAX_EXTENDED_ITEM_TYPES = 64,
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};
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char m_aData[CSnapshot::MAX_SIZE];
int m_DataSize;
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int m_aOffsets[MAX_ITEMS];
int m_NumItems;
int m_aExtendedItemTypes[MAX_EXTENDED_ITEM_TYPES];
int m_NumExtendedItemTypes;
void AddExtendedItemType(int Index);
int GetExtendedItemTypeIndex(int TypeID);
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public:
CSnapshotBuilder();
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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);
int *GetItemData(int Key);
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int Finish(void *Snapdata);
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};
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#endif // ENGINE_SNAPSHOT_H