--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bluetooth/btstack/rfcomm/Rfcommfcs.cpp	Fri Jan 15 08:13:17 2010 +0200
@@ -0,0 +1,93 @@
+// Copyright (c) 1999-2009 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:
+// Calculation for the RFCOMM (TS07.10) FCS
+// 
+//
+
+#include <e32std.h>
+#include "rfcommfcs.h"
+#include "debug.h"
+
+#pragma warning( disable : 4244) // Conv from int to char
+
+/*
+  This table is lifted from the TS07.10 spec in the appendices.
+*/
+
+static const TUint8 crctable[256] = { //reversed, 8-bit, poly=0x07
+0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B,
+0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67,
+0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43,
+0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F,
+0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B,
+0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17,
+0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33,
+0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F,
+0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B,
+0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87,
+0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3,
+0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF,
+0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB,
+0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7,
+0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3,
+0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
+};
+
+
+TUint8 CalcFCS(const TUint8* aData, TInt aLen)
+	/**
+	   Calculates the FCS over data starting at aData and of length
+	   aLen.  Uses the algorithm from the TS07.10 spec.
+	**/
+	{
+	TUint8 fcs=0xff;
+	
+	while(aLen--)
+		{
+		fcs=crctable[fcs^*aData++];
+		}
+	
+	fcs=~fcs;
+	return fcs;
+	}
+
+TBool CheckFCS(const TUint8* aData, TInt aLen, TUint8 aFCS)
+    /**
+	   Check a received FCS.
+	 **/   
+	{
+	TUint8 fcs=0xFF;
+	while (aLen--)
+		{
+		fcs=crctable[fcs^*aData++];
+		}
+    /*Ones complement*/
+	fcs=crctable[fcs^aFCS];
+// log "PDU FCS:" aFCS - Shehla
+	RFQBLOG(KBlogTypeFCS, Log(KBlogActualFCS, aFCS));
+// log this as "Calculated FCS (should be 0xCF): " fcs - Shehla
+	RFQBLOG(KBlogTypeFCS, Log(KBlogComputedFCS, fcs));
+    /*0xCF is the reversed order of 11110011.*/
+	TBool result=EFalse; //- Shehla
+	if (fcs==0xCF)
+		//return ETrue;
+		result=ETrue;
+	else 
+		//return EFalse;
+		result=EFalse;
+//log "FCS Computation" result - Shehla
+	RFQBLOG(KBlogTypeFCS, Log(KBlogComparedFCS, result));
+
+	return result;
+}