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engine/NetworkStringTableItem.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+#include "quakedef.h"
+#include "networkstringtableitem.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CNetworkStringTableItem::CNetworkStringTableItem( void )
+{
+	m_pUserData = NULL;
+	m_nUserDataLength = 0;
+	m_nTickChanged = 0;
+
+#ifndef SHARED_NET_STRING_TABLES
+	m_nTickCreated = 0;
+	m_pChangeList = NULL;
+#endif
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CNetworkStringTableItem::~CNetworkStringTableItem( void )
+{
+#ifndef SHARED_NET_STRING_TABLES
+	if ( m_pChangeList )
+	{
+		// free changelist and elements
+
+		for ( int i=0; i < m_pChangeList->Count(); i++ )
+		{
+			itemchange_s item = m_pChangeList->Element( i );
+
+			if ( item.data )
+				delete[] item.data;
+		}
+
+		delete m_pChangeList; // destructor calls Purge()
+
+		m_pUserData = NULL;
+	}
+#endif
+		
+	if ( m_pUserData )
+	{
+		delete[] m_pUserData;
+	}
+}
+
+#ifndef SHARED_NET_STRING_TABLES
+void CNetworkStringTableItem::EnableChangeHistory( void )
+{
+	if ( m_pChangeList )
+		return; // already enabled
+
+	m_pChangeList = new CUtlVector<itemchange_s>;
+
+	Assert ( m_pChangeList );
+}
+
+void CNetworkStringTableItem::UpdateChangeList( int tick, int length, const void *userData )
+{
+	int count = m_pChangeList->Count();
+	itemchange_s item;
+
+	if ( count > 0 )
+	{	
+		// check if different from last change in list
+		item = m_pChangeList->Element( count-1 );
+
+		if ( !item.data && !userData )
+			return; // both NULL data
+
+		if ( item.length == length )
+		{
+			if ( item.data && userData )
+			{
+				if ( Q_memcmp( (void*)userData, (void*)item.data, length ) == 0 )
+				{
+					return; // no data or size change
+				}
+			}
+		}
+
+		if ( item.tick == tick )
+		{
+			// two changes within same tick frame, remove last change from list
+			if ( item.data )
+			{
+				delete[] item.data;
+			}
+
+			m_pChangeList->Remove( count-1 );
+		}
+				
+	}
+
+	item.tick = tick;
+
+	// add new user data and time stamp
+
+	if ( userData && length )
+	{
+		item.data = new unsigned char[length];
+		item.length = length;
+		Q_memcpy( item.data, userData, length );
+	}
+	else
+	{
+		item.data = NULL;
+		item.length = 0;
+	}
+
+	m_pChangeList->AddToTail( item );
+}
+
+int CNetworkStringTableItem::RestoreTick( int tick )
+{
+	Assert( m_pChangeList->Count()>0 );
+
+	int index = 1;
+
+	itemchange_s *item = &m_pChangeList->Element( 0 );
+
+	while ( index < m_pChangeList->Count() )
+	{
+		itemchange_s *nextitem = &m_pChangeList->Element( index );
+
+		if ( nextitem->tick > tick )
+		{
+			break;
+		}
+
+		item = nextitem;
+		index++;
+	}
+
+	if ( item->tick > tick )
+	{
+		// this string was created after tick, so ignore it right now
+		m_pUserData = NULL;
+		m_nUserDataLength = 0;
+		m_nTickChanged = 0;
+	}
+	else
+	{
+		// restore user data for this string
+		m_pUserData = item->data;
+		m_nUserDataLength = item->length;
+		m_nTickChanged = item->tick;
+	}
+
+	return m_nTickChanged;
+}
+#endif
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : *string - 
+//-----------------------------------------------------------------------------
+bool CNetworkStringTableItem::SetUserData( int tick, int length, const void *userData )
+{
+
+#ifndef SHARED_NET_STRING_TABLES
+	if ( m_pChangeList )
+	{
+		UpdateChangeList( tick, length, userData );
+		return false;
+	}
+	Assert ( m_nTickCreated > 0 && m_nTickCreated <= tick );
+#endif
+
+	Assert ( m_nTickChanged > 0 && m_nTickChanged <= tick );
+	Assert ( length < CNetworkStringTableItem::MAX_USERDATA_SIZE );
+
+	// no old or new data
+	if ( !userData && !m_pUserData )
+		return false;
+
+	if ( m_pUserData && 
+		length == m_nUserDataLength &&
+		!Q_memcmp( m_pUserData, (void*)userData, length ) )
+	{
+		return false; // old & new data are equal
+	}
+
+	if ( m_pUserData )
+		delete[] m_pUserData;
+
+	m_nUserDataLength = length;
+
+	if ( length > 0 )
+	{
+		m_pUserData = new unsigned char[ length ];
+		Q_memcpy( m_pUserData, userData, length );
+	}
+	else
+	{
+		m_pUserData = NULL; 
+	}
+
+	m_nTickChanged = tick;
+
+	return true;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : stringNumber - 
+// Output : const void
+//-----------------------------------------------------------------------------
+const void *CNetworkStringTableItem::GetUserData( int *length )
+{
+	if ( length )
+		*length = m_nUserDataLength;
+
+	return ( const void * )m_pUserData;
+}
+
+
+
+
+
+