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utils/vmpi/loopback_channel.cpp

@@ -0,0 +1,98 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include "loopback_channel.h"
+#include "utllinkedlist.h"
+#include "iphelpers.h"
+
+
+// -------------------------------------------------------------------------------- //
+// CLoopbackChannel.
+// -------------------------------------------------------------------------------- //
+
+typedef struct
+{
+	int				m_Len;
+	unsigned char	m_Data[1];
+} LoopbackMsg_t;
+
+
+class CLoopbackChannel : public IChannel
+{
+public:
+
+	virtual				~CLoopbackChannel()
+	{
+		FOR_EACH_LL( m_Messages, i )
+		{
+			free( m_Messages[i] );
+		}
+		m_Messages.Purge();
+	}
+
+	virtual void		Release()
+	{
+		delete this;
+	}
+
+	virtual bool	Send( const void *pData, int len )
+	{
+		const void *pChunks[1] = { pData };
+		int chunkLengths[1] = { len };
+		return SendChunks( pChunks, chunkLengths, 1 );
+	}
+	
+	virtual bool	SendChunks( void const * const *pChunks, const int *pChunkLengths, int nChunks )
+	{
+		CChunkWalker walker( pChunks, pChunkLengths, nChunks );
+
+		LoopbackMsg_t *pMsg = (LoopbackMsg_t*)malloc( sizeof( LoopbackMsg_t ) - 1 + walker.GetTotalLength() );
+		walker.CopyTo( pMsg->m_Data, walker.GetTotalLength() );
+		pMsg->m_Len = walker.GetTotalLength();
+		m_Messages.AddToTail( pMsg );
+		return true;
+	}
+	
+	virtual bool	Recv( CUtlVector<unsigned char> &data, double flTimeout )
+	{
+		int iNext = m_Messages.Head();
+		if ( iNext == m_Messages.InvalidIndex() )
+		{
+			return false;
+		}
+		else
+		{
+			LoopbackMsg_t *pMsg = m_Messages[iNext];
+			
+			data.CopyArray( pMsg->m_Data, pMsg->m_Len );
+			
+			free( pMsg );
+			m_Messages.Remove( iNext );
+
+			return true;
+		}
+	}
+	
+	virtual bool	IsConnected()
+	{
+		return true;
+	}
+
+	virtual void	GetDisconnectReason( CUtlVector<char> &reason )
+	{
+	}
+
+private:
+	CUtlLinkedList<LoopbackMsg_t*,int>	m_Messages;	// FIFO for messages we've sent.
+};
+
+
+IChannel* CreateLoopbackChannel()
+{
+	return new CLoopbackChannel;
+}
+