--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hti/HtiServicePlugins/HtiIpProxyServicePlugin/IPProxyEngine/Src/CExprUDPMsg.cpp	Wed Oct 13 16:17:58 2010 +0300
@@ -0,0 +1,204 @@
+/*
+* Copyright (c) 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:  IPProxy UDP protocol expression for a regular UDP message
+*                connection.
+*
+*/
+
+
+
+// INCLUDE FILES
+#include "CExprUDPMsg.h"
+#include "CommRouterDefinitions.h"
+#include "MExpressionObserver.h"
+
+#define DEBUG_FILENAME "IPProxyEngine.log"
+#include "DebugPrint.h"
+
+
+// ============================ MEMBER FUNCTIONS ===============================
+
+// -----------------------------------------------------------------------------
+// CExprUDPMsg::CExprUDPMsg
+// -----------------------------------------------------------------------------
+//
+CExprUDPMsg::CExprUDPMsg( MExpressionObserver* aObserver )
+    : iObserver( aObserver )
+    {
+    __ASSERT_DEBUG( iObserver, User::Invariant() );
+    }
+
+// -----------------------------------------------------------------------------
+// CExprUDPMsg::NewL
+// -----------------------------------------------------------------------------
+//
+CExprUDPMsg* CExprUDPMsg::NewL( MExpressionObserver* aObserver )
+    {
+    CExprUDPMsg* self = CExprUDPMsg::NewLC( aObserver );
+    CleanupStack::Pop();
+
+    return self;
+    }
+
+// -----------------------------------------------------------------------------
+// CExprUDPMsg::NewLC
+// -----------------------------------------------------------------------------
+//
+CExprUDPMsg* CExprUDPMsg::NewLC( MExpressionObserver* aObserver )
+    {
+    CExprUDPMsg* self = new( ELeave ) CExprUDPMsg( aObserver );
+    CleanupStack::PushL( self );
+
+    return self;
+    }
+
+
+// Destructor
+CExprUDPMsg::~CExprUDPMsg()
+    {
+    }
+
+
+// -----------------------------------------------------------------------------
+// CExprUDPMsg::HandleReceivedDataL()
+// -----------------------------------------------------------------------------
+//
+TBool CExprUDPMsg::HandleRecievedMsgL( TDes8& aData, TInt& aStartPos, TInt& aLength )
+    {
+    // Check if the prefix matches
+    aStartPos = aData.Find( KUDPPrefix );
+
+    if ( aStartPos != KErrNotFound  )
+        {
+        // Found a matching prefix
+        // Let the observer know
+        iObserver->FrameStarted();
+
+        TPtr8 dataToParse( aData.MidTPtr( aStartPos ) );
+
+        TInt err = TryParsingL( dataToParse, aLength );
+
+        if ( err != KErrNone )
+            {
+            // corrupted data in the frame
+            iObserver->ProtocolErrorL( err, aData );
+            // delete the corrupted data
+            aData.SetLength( 0 );
+            }
+
+        return ETrue;
+        }
+    else
+        {
+        return EFalse;
+        }
+
+    }
+
+// -----------------------------------------------------------------------------
+// CExprUDPMsg::TryParsingL
+// -----------------------------------------------------------------------------
+//
+TInt CExprUDPMsg::TryParsingL( TDes8& aData, TInt& aLength )
+    {
+    __ASSERT_ALWAYS( aData.Left( KUDPPrefix().Length() ) == KUDPPrefix,
+        User::Panic( _L("Protocol"), 1 ) );
+
+    // UDP:0123,000e,[Some test data]
+    TInt frameOverhead =
+        KUDPPrefix().Length() +
+        KHexDecimalLength +
+        KPortSuffix().Length() +
+        KHexDecimalLength +
+        KLengthSuffix().Length() +
+        KDataSuffix().Length() +
+        KMessageSuffix().Length();
+
+    if ( aData.Length() >= frameOverhead )
+        {
+        TPtrC8 portPtr(
+            aData.Mid( KUDPPrefix().Length(), KHexDecimalLength ) );
+
+        TLex8 portLexer( portPtr );
+        TUint port;
+        if ( portLexer.Val( port, EHex ) != KErrNone )
+            {
+            return KErrCorrupt;
+            }
+        DEBUG_PRINT( DEBUG_STRING( "CExprUDPMsg::TryParsingL, port = %d" ), port );
+
+        //Check port suffix
+        if ( aData.Mid( KUDPPrefix().Length() +
+            KHexDecimalLength, KPortSuffix().Length() ) != KPortSuffix )
+            {
+            return KErrCorrupt;
+            }
+
+        TPtrC8 lengthPtr( aData.Mid( KUDPPrefix().Length() +
+            KHexDecimalLength + KPortSuffix().Length(), KHexDecimalLength ) );
+        TLex8 lengthLexer( lengthPtr );
+        TUint length;
+        if ( lengthLexer.Val( length, EHex ) != KErrNone )
+            {
+            return KErrCorrupt;
+            }
+        DEBUG_PRINT( DEBUG_STRING( "CExprUDPMsg::TryParsingL, length = %d" ), length );
+
+        //Check length suffix
+        if ( aData.Mid(
+            KUDPPrefix().Length() +
+            KHexDecimalLength +
+            KPortSuffix().Length() +
+            KHexDecimalLength, KLengthSuffix().Length() ) != KLengthSuffix )
+            {
+            return KErrCorrupt;
+            }
+
+        DEBUG_PRINT( DEBUG_STRING( "CExprUDPMsg::TryParsingL, parsing data" ), length );
+
+        if ( aData.Length() >= TInt( frameOverhead + length ) )
+            {
+            TInt messagePos = KUDPPrefix().Length() +
+                KHexDecimalLength +
+                KPortSuffix().Length() +
+                KHexDecimalLength +
+                KLengthSuffix().Length();
+
+            TPtrC8 message( aData.Mid( messagePos, length ) );
+            if ( aData.Mid( messagePos + length,
+                KDataSuffix().Length() ) != KDataSuffix )
+                {
+                return KErrCorrupt;
+                }
+            DEBUG_PRINT( DEBUG_STRING( "CExprUDPMsg::TryParsingL, message OK" ) );
+
+            if ( aData.Mid( messagePos + length + KDataSuffix().Length(),
+                KMessageSuffix().Length() ) != KMessageSuffix )
+                {
+                return KErrCorrupt;
+                }
+
+            // send parsed results
+            iObserver->FrameParsedL( port, message );
+            // set the length of the handled message
+            aLength = frameOverhead + length;
+
+            return KErrNone;
+            }
+
+        }
+    return KErrNone;
+    }
+
+//  End of File