Method UnpackDelta

src/engine/shared/snapshot.cpp:513–629

}

int CSnapshotDelta::UnpackDelta(const CSnapshot *pFrom, CSnapshot *pTo, const void *pSrcData, int DataSize, bool Sixup)
{
	CData *pDelta = (CData *)pSrcData;
	int *pData = (int *)pDelta->m_aData;
	int *pEnd = (int *)(((char *)pSrcData + DataSize));

	CSnapshotBuilder Builder;
	Builder.Init();

	// unpack deleted stuff
	int *pDeleted = pData;
	if(pDelta->m_NumDeletedItems < 0)
		return -201;
	pData += pDelta->m_NumDeletedItems;
	if(pData > pEnd)
		return -101;

	// copy all non deleted stuff
	for(int i = 0; i < pFrom->NumItems(); i++)
	{
		const CSnapshotItem *pFromItem = pFrom->GetItem(i);
		const int ItemSize = pFrom->GetItemSize(i);
		bool Keep = true;
		for(int d = 0; d < pDelta->m_NumDeletedItems; d++)
		{
			if(pDeleted[d] == pFromItem->Key())
			{
				Keep = false;
				break;
			}
		}

		if(Keep)
		{
			void *pObj = Builder.NewItem(pFromItem->Type(), pFromItem->Id(), ItemSize);
			if(!pObj)
				return -301;

			// keep it
			mem_copy(pObj, pFromItem->Data(), ItemSize);
		}
	}

	// unpack updated stuff
	for(int i = 0; i < pDelta->m_NumUpdateItems; i++)
	{
		if(pData + 2 > pEnd)
			return -102;

		const int Type = *pData++;
		if(Type < 0 || Type > CSnapshot::MAX_TYPE)
			return -202;

		const int Id = *pData++;
		if(Id < 0 || Id > CSnapshot::MAX_ID)
			return -203;

		int ItemSize;