diff -r 000000000000 -r 3553901f7fa8 telephonyprotocols/rawipnif/version1/src/BcaController.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/telephonyprotocols/rawipnif/version1/src/BcaController.cpp	Tue Feb 02 01:41:59 2010 +0200
@@ -0,0 +1,437 @@
+// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// Implements the interface to Bca & flow control.
+// 
+//
+
+/**
+ @file
+*/
+
+#include <e32uid.h>
+#include <nifmbuf.h>
+#include <es_ini.h>
+#include "BcaController.h"
+
+_LIT(KRawIpIniFile, "rawip.ini");
+_LIT(KLinkLit, "link");
+_LIT(KHighmarkLit, "highmark");
+//In order not to flow off SPUD everytime we set the default to 1
+const TUint KDefaultBufferSize=1;
+
+CBcaController::CBcaController(MControllerObserver& aObserver,
+	CBttLogger* aTheLogger)
+/**
+ * Constructor. 
+ */
+	: iObserver(aObserver),  
+	  iTheLogger(aTheLogger),
+	  iTxFlowControl(EFlowControlOff), 
+	  iTxContextActive(ETrue), 
+	  iSendState(EIdle),
+	  iMaxSendQueueLen(0),
+	  iNumPacketsInSendQueue(0)
+	{
+	iSendQueue.Init();
+	}
+
+
+CBcaController::~CBcaController()
+/**
+ * Destructor.
+ */
+	{
+	iSendQueue.Free();
+	iNumPacketsInSendQueue = 0;
+
+#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS
+	delete iIPTagHeader;
+#endif // RAWIP_HEADER_APPENDED_TO_PACKETS
+	}
+
+void CBcaController::BaseConstructL()
+	{
+	_LOG_L1C1(_L8("CBcaController::BaseConstructL"));
+
+#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS
+	iIPTagHeader = new (ELeave) CIPTagHeader(iTheLogger);
+#endif // RAWIP_HEADER_APPENDED_TO_PACKETS
+	CESockIniData* iniData = NULL;
+	TRAPD(res, iniData = CESockIniData::NewL(KRawIpIniFile));
+	CleanupStack::PushL(iniData);
+	
+	if(res!=KErrNone)
+		{
+		_LOG_L1C2(_L8("RawIp ini file %S not found. Default values will be used."), &KRawIpIniFile);
+		CleanupStack::PopAndDestroy();
+		return;
+		}
+	
+	//here process the file
+	if(!iniData->FindVar(KLinkLit(), KHighmarkLit(), iMaxSendQueueLen))
+		{
+		iMaxSendQueueLen = KDefaultBufferSize;
+		}
+	
+	CleanupStack::PopAndDestroy();
+	}
+
+void CBcaController::UpdateInternalFlowFlag(TFlowControl aValue)
+/**
+ *  Updates Internal Flow flag and resumes the data flow if
+ *  necessary.
+ *
+ * @param aValue the new state of iInternalFlow
+ */
+	{
+	_LOG_L1C3(_L8("CBcaController::UpdateInternalFlowFlag[NewValue=%d, iSendState=%d]"),
+		aValue, iSendState);
+
+	if(iTxFlowControl == aValue)
+		{
+		// C32 Sent the same indication signal twice. Nif will ignore it.
+		_LOG_L2C1(_L8("WARNING CBcaController: Received same indication twice"));
+		return;
+		}
+	
+	// Update the flag value.
+	iTxFlowControl = aValue;
+
+	if(iTxFlowControl == EFlowControlOff)
+		{
+		// If the indication received turned flow control off...
+		if (IsTxPossible() && (iSendState == EIdle))
+			{
+			// ... if the NIF is in the EWaiting state
+			// then the data flow can be resumed. 
+			ResumeSending();
+			}
+		}		
+	else
+		{
+		// if the Flow Control is on we can remove all queued write requests
+		EmptySendQueue();
+		}
+	}
+
+void CBcaController::UpdateContextStateFlag(TBool aValue)
+/**
+ *  Updates Context State flag and resumes the data flow if
+ *  necessary.
+ *
+ * @param aValue the new state of iTxContextState
+ */
+	{
+	_LOG_L1C3(_L8("CBcaController::UpdateContextStateFlag[NewValue=%d, OldValue=%d]"),
+		aValue, iTxContextActive);
+	
+	if(iTxContextActive == aValue)
+		{
+		return;
+		}
+
+	// Update the flag value.
+	iTxContextActive = aValue;
+
+	if(iTxContextActive)
+		{
+		// If the PDP context is active and...
+		if (IsTxPossible() && (iSendState == EIdle))
+			{
+			// ... if the NIF is in the EWaiting state
+			// then the data flow can be resumed. 
+			ResumeSending();
+			}
+		}
+	else
+		{
+		// if the PDP context is suspended we can remove all queued write requests
+		EmptySendQueue();
+		}
+	}
+
+TInt CBcaController::Send(RMBufChain& aPdu)
+/**
+ *  This method is called by CRawIPNifMain in order to send a packet down
+ * to the BCA. 
+ *
+ *	@param aPdu a data packet
+ */
+	{
+	_LOG_L1C1(_L8(">>CBcaController::Send"));
+
+	// Check if NIF is shutting down
+	if (iSendState == EShuttingDown)
+		{
+		_LOG_L2C1(_L8("    ERROR: Nif is shutting down"));
+		
+		aPdu.Free();
+
+		return KErrDisconnected;
+		}
+	
+	// check that this packet isnt too big - If it is, we dont want to send it or
+	// add it to our queue
+	if ((aPdu.Length() - aPdu.First()->Length()) > BcaSendBufferLength())
+		{
+		_LOG_L2C1(_L8("Packet is too large - discarding"));
+		_LOG_L1C1(_L8("<<CSender::Send -> Error"));
+
+		aPdu.Free();
+		return KErrArgument;
+		}
+	
+	if (iSendState == ESending)
+		// If this happens, it means that TCP/IP has sent us an IP packet
+		// while we're still sending the previous one. 
+		{
+		// check that the queue isnt full NB. this check should not be needed as when the 
+		// queue becomes full the IP layer shouldnt send any more packets until it is told to
+		if (!IsSendQueueFull())
+			{
+			_LOG_L1C1(_L8("    Sender busy, appending packet to queue"));
+			//We know that flow control is off and context isnt suspended so can add to queue
+			AppendToSendQueue(aPdu);
+			
+			return IsSendQueueFull() ? KStopSending : KContinueSending;
+			}
+			
+		_LOG_L1C1(_L8("    Queue is full, upper layer is still sending packets, potential memory problems."));
+		AppendToSendQueue(aPdu);
+		return KStopSending;
+		}
+
+	// If we have got here then a write isnt currently happening
+	// We dont need to check flow control is off and context isnt suspended as the BCA always
+	// has room for one packet, so send the packet
+
+	if(!IsSendQueueEmpty())
+		{
+		//make sure that we don't change the order of packets!
+		//first send what has already been lined up
+		RMBufChain tmpPdu;
+		_LOG_L1C1(_L8("    Packet removed from queue to send"));
+		RemoveFromSendQueue(tmpPdu);
+		AppendToSendQueue(aPdu);
+		
+		// Update module state
+		_LOG_L2C1(_L8("     set State to ESending"));
+		iSendState = ESending;
+		
+		BcaSend(tmpPdu);
+		}
+	else
+		{
+		// Update module state
+		_LOG_L2C1(_L8("     set State to ESending"));
+		iSendState = ESending;
+		 
+		BcaSend(aPdu);
+		}
+		
+	_LOG_L2C1(_L8("<<CBcaController::Send - return StopSending/ContinueSending"));
+	return IsSendQueueFull() ? KStopSending : KContinueSending;
+	}
+
+void CBcaController::SendComplete()	
+/**
+ *  This method is called after a packet was sent to the board. 
+ *  If allowed by flow contol flags the NIF can signal the TCP/IP
+ *  protocol indicating that is available to send more packets.
+ */
+	{
+	_LOG_L1C1(_L8("CBcaController::SendComplete"));
+	_LOG_L2C1(_L8("     set State to EIdle"));
+	
+	iSendState = EIdle;
+
+	if (IsTxPossible())
+		ResumeSending();
+	}
+
+TBool CBcaController::IsTxPossible()
+/**
+ *  This method returns ETrue if both TX flags are set to ETrue
+ *
+ * @return The Flow control state
+ */
+	{
+	_LOG_L1C3(_L8("CBcaController::IsTxPossible (contextActive %d, flowcontrol %d)"), 
+		iTxContextActive, iTxFlowControl);
+
+	if(iTxContextActive && (iTxFlowControl == EFlowControlOff))
+		return ETrue;
+	else
+		return EFalse;
+	}
+
+void CBcaController::Process(TDesC8& aPdu)
+/**
+ *  This method will pass on the received data to CBttNifMain. 
+ *
+ * @param aPdu a data packet
+ */
+	{
+	_LOG_L1C1(_L8(">>CBcaController::Process"));
+
+	TInt ret;
+
+	// Create a packet object.
+	RMBufPacket packet;
+	TRAP(ret, packet.CreateL(aPdu));
+	if (ret != KErrNone)
+		{
+		// Couldn't create package. Packet will be ignored...
+		_LOG_L1C2(_L8("<<CBcaController::Process couldn't create MBuf [ret=%d]"), ret);
+		return;
+		}
+	else
+		// Package created...
+		{
+#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS
+		TUint16 protocolCode = iIPTagHeader->RemoveHeader(packet);
+#else
+		TUint16 protocolCode = 0;
+#endif // RAWIP_HEADER_APPENDED_TO_PACKETS
+
+		packet.Pack();
+		// Process the packet
+		GetObserver().Process(packet, protocolCode);
+		}
+
+	_LOG_L1C1(_L8("<<CBcaController::Process"));
+	}
+
+void CBcaController::ResumeSending()
+/**
+ *  Used to indicate to the TCP/IP protocol layer that the NIF is ready to 
+ *	process more packets.
+ */
+	{
+	_LOG_L1C1(_L8("CBcaIoController::ResumeSending"));
+
+	// If there are still some packets in the queue to be sent, then carry
+	// on sending them.
+	// NB. we only want to send more packets from the queue if we are currently EIdle
+	if (iSendState == EIdle) 
+		{
+		if(!IsSendQueueEmpty())
+			{
+			RMBufChain tmpPdu;
+			_LOG_L1C1(_L8("    Packet removed from queue to send"));
+			RemoveFromSendQueue(tmpPdu);
+			
+			// Update module state
+			_LOG_L2C1(_L8("     set State to ESending"));
+			iSendState = ESending;
+			
+			BcaSend(tmpPdu);
+			}
+		if(IsSendQueueEmpty())
+			{
+			iObserver.ResumeSending();
+			}
+		}
+	// if iSendState = ESending - do nothing
+	}
+	
+#ifdef RAWIP_HEADER_APPENDED_TO_PACKETS
+void CBcaController::SetType(TUint16 aType)
+{
+/**
+ *  Used to specify the type of the IP header.
+ */
+	_LOG_L1C1(_L8("CBcaController::SetType"));
+	
+	iIPTagHeader->SetType(aType);	
+}
+
+void CBcaController::AddHeader(TDes8& aDes)
+/**
+ *  Used to add the IP header to the packet before sending to the BCA.
+ */
+	{
+	_LOG_L1C1(_L8("CBcaController::AddHeader"));
+
+	iIPTagHeader->AddHeader(aDes);
+	}
+
+TUint16 CBcaController::RemoveHeader(RMBufChain& aPdu)
+/**
+ *  Used to remove the IP header from the received the packet before sending to the 
+ *  TCP/IP layer.  
+ * @return The IP header that has been removed from the packet
+ */
+	{
+	_LOG_L1C1(_L8("CBcaController::RemoveHeader"));
+
+	return (iIPTagHeader->RemoveHeader(aPdu));
+	}	
+#endif // RAWIP_HEADER_APPENDED_TO_PACKETS
+
+TBool CBcaController::IsSendQueueEmpty()
+/**
+ *  Indicator of whether the BufferQueue is empty
+ * @return TBool.  ETrue if bufferQueue is emtpy, EFalse if queue is not empty
+ */
+	{
+	return iSendQueue.IsEmpty();
+	}
+	
+TBool CBcaController::IsSendQueueFull()
+/**
+ *  Indicator of whether the BufferQueue is full
+ * @return TBool.  ETrue if bufferQueue is full, EFalse if queue is not full
+ */
+	{
+	return iNumPacketsInSendQueue >= iMaxSendQueueLen;
+	}	
+
+void CBcaController::AppendToSendQueue(RMBufChain& aPdu)
+/**
+ * Appends the packet aPdu to the queue. 
+ * Increments the packet count. Doesn't do error checking.
+ * @param aChain buffer chain to be added
+ */
+	{
+	iSendQueue.Append(aPdu);
+	iNumPacketsInSendQueue++;
+	}
+	
+TBool CBcaController::RemoveFromSendQueue(RMBufChain& aPdu)
+/**
+ * Removes the packet aPdu from the queue. 
+ * Decrements the packet count.
+ * @param aChain buffer chain to be added
+ * @return False if chain is empty
+ */
+	{
+	TBool ret = iSendQueue.Remove(aPdu);
+	if(ret)
+		{
+		iNumPacketsInSendQueue--;
+		}
+	return ret;
+	}
+	
+void CBcaController::EmptySendQueue()
+/**
+ * Removes all the packets from the send queue. Initializes the
+ * send queue and sets the packet count to 0.
+ */
+	{
+	iSendQueue.Free();
+	iSendQueue.Init();
+	iNumPacketsInSendQueue = 0;
+	}