--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/datasourcemodules/bluetoothgpspositioningmodule/btgpspsy/src/Utils/BTGPSNmeaBuffer.cpp	Fri Jun 04 10:34:15 2010 +0100
@@ -0,0 +1,196 @@
+// 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:
+//
+
+
+
+// INCLUDE FILES
+#include "BTGPSNmeaBuffer.h"
+#include "BTGPSMessageDef.h"
+#include "BTGPSPanic.h"
+
+// EXTERNAL DATA STRUCTURES
+
+// EXTERNAL FUNCTION PROTOTYPES  
+
+// CONSTANTS
+
+// Granularity
+
+// MACROS
+
+// LOCAL CONSTANTS AND MACROS
+
+// MODULE DATA STRUCTURES
+
+// LOCAL FUNCTION PROTOTYPES
+
+// FORWARD DECLARATIONS
+
+// ============================= LOCAL FUNCTIONS ===============================
+
+// ============================ MEMBER FUNCTIONS ===============================
+
+
+// -----------------------------------------------------------------------------
+// CBTGPSNmeaBuffer::NewL
+// -----------------------------------------------------------------------------
+CBTGPSNmeaBuffer* CBTGPSNmeaBuffer::NewL(TInt aSize)
+    {
+    CBTGPSNmeaBuffer* self = new (ELeave) CBTGPSNmeaBuffer();
+    CleanupStack::PushL(self);
+    self->ConstructL(aSize);
+    CleanupStack::Pop();
+    return self;
+    }
+
+// -----------------------------------------------------------------------------
+// CBTGPSNmeaBuffer::~CBTGPSNmeaBuffer
+// -----------------------------------------------------------------------------
+CBTGPSNmeaBuffer::~CBTGPSNmeaBuffer()
+    {
+    delete iBuffer;
+    }
+
+// -----------------------------------------------------------------------------
+// CBTGPSNmeaBuffer::ConstructL
+// -----------------------------------------------------------------------------
+void CBTGPSNmeaBuffer::ConstructL(TInt aSize)
+    {
+    iBuffer = (TUint8*)User::AllocZL(aSize);
+    iSize = aSize;
+    }
+
+// -----------------------------------------------------------------------------
+// CBTGPSNmeaBuffer::CBTGPSNmeaBuffer
+// C++ default constructor can NOT contain any code, that
+// might leave.
+// -----------------------------------------------------------------------------
+CBTGPSNmeaBuffer::CBTGPSNmeaBuffer()
+    {
+    }
+
+// -----------------------------------------------------------------------------
+// CBTGPSNmeaBuffer::ResetBuffer
+// -----------------------------------------------------------------------------
+void CBTGPSNmeaBuffer::ResetBuffer()
+    {
+    Mem::FillZ(iBuffer,iSize);
+    iBottom = 0;
+    }
+
+// -----------------------------------------------------------------------------
+// CBTGPSNmeaBuffer::CurrentIndex
+// -----------------------------------------------------------------------------
+TInt CBTGPSNmeaBuffer::CurrentIndex() const
+    {
+    return iBottom;
+    }
+
+// -----------------------------------------------------------------------------
+// CBTGPSNmeaBuffer::AddSentences
+// -----------------------------------------------------------------------------
+void CBTGPSNmeaBuffer::AddSentences(const TDesC8& aNmea)
+    {
+    TPtrC8 srcDes(aNmea);
+    TInt srcLen = srcDes.Length();
+    
+    while(srcLen>0)
+        {
+        TInt maxSize = iSize-iBottom;
+        TPtr8 ptr(iBuffer+iBottom, maxSize);
+        TInt cpLen = Min(maxSize,srcLen);
+        ptr.Copy(srcDes.Left(cpLen));
+        iBottom = (iBottom+cpLen)%iSize;
+        srcDes.Set(srcDes.Right(srcLen-cpLen));
+        srcLen = srcDes.Length();
+        }
+    }
+
+// -----------------------------------------------------------------------------
+// CBTGPSNmeaBuffer::ReadSentences
+// -----------------------------------------------------------------------------
+TInt CBTGPSNmeaBuffer::ReadSentences(
+            TDes8& aDest, 
+            TInt& aBeginning) const
+    {
+    __ASSERT_DEBUG(aBeginning<iSize, Panic(EPanicIndexOutOfRange));
+    
+    //Clear destination descriptor
+    aDest.Zero();
+
+    TBool started = EFalse;
+    TBool ended = EFalse;
+    
+    if(aBeginning==iBottom)
+        {
+        return KErrEof;
+        }
+    
+    if(aBeginning == KBTGPSNmeaIndexNotSet)
+        {
+        if(iBuffer[iBottom]!=0)
+            {
+            //Buffer has been rotated
+            aBeginning = iBottom;
+            }
+        else
+            {
+            //Read from 0 to iBottom
+            aBeginning = 0;
+            if(iBottom == 0)
+                {
+                return KErrEof;
+                }
+            }
+        }
+        
+    do
+        {
+        TUint8 nextChar = iBuffer[aBeginning];
+        if(nextChar == KNmeaSentenceLead)
+            {
+            //Mark start of NMEA sentences
+            started = ETrue;
+            }
+            
+        if(started && aDest.Length()<aDest.MaxLength())
+            {
+            aDest.Append(nextChar);
+            }
+            
+        aBeginning ++;
+        aBeginning = aBeginning%iSize;
+
+        if(started && nextChar == KNmeaSentenceTerminator2)
+            {
+            //Mark end of the sentence.
+            ended = ETrue;
+            }
+        }while(aBeginning!=iBottom && !ended);
+    
+    
+    if(aDest.Length()!=0)
+        {
+        return KErrNone;
+        }
+        
+    return KErrEof;
+    }
+        
+
+//  End of File
+
+
+