diff -r f1578314b8da -r 505ad3f0ce5c Msrp/MsrpHeader/src/TMSRPHeaderUtil.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Msrp/MsrpHeader/src/TMSRPHeaderUtil.cpp	Sat Jun 12 14:30:11 2010 +0530
@@ -0,0 +1,111 @@
+/*
+* Copyright (c) 2009-2010 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:
+* MSRP Implementation
+*
+*/
+
+// CLASS HEADER
+#include "TMSRPHeaderUtil.h"
+
+// INTERNAL INCLUDES
+#include "MsrpCommon.h"
+#include "CMSRPByteRangeHeader.h"
+
+
+// -----------------------------------------------------------------------------
+// TMSRPHeaderUtil::ConvertToNumberL
+// -----------------------------------------------------------------------------
+//
+TInt TMSRPHeaderUtil::ConvertToNumber( const TDesC8& aString )
+    {
+	// checking for special characters:
+	// Unknown byte range end
+	if ( aString == KAsterisk )
+		{
+		// Range unknown
+		return KUnknownRange;
+		}
+	TLex8 numberToConvert( aString );
+	TInt convertedNumber( 0 );
+	numberToConvert.Val( convertedNumber );
+
+	return convertedNumber;
+	}
+
+// -----------------------------------------------------------------------------
+// TMSRPHeaderUtil::AppendStringL
+// -----------------------------------------------------------------------------
+//
+void TMSRPHeaderUtil::AppendStringL( const TDesC8& aString, TDes8& aDest )
+	{
+	TInt newLength = aString.Length() + aDest.Length();
+	if ( newLength > aDest.MaxLength() )
+		{
+		// not enough room
+		User::Leave( KErrArgument );
+		}
+	aDest.Append( aString );
+	}
+
+// -----------------------------------------------------------------------------
+// TMSRPHeaderUtil::CheckStringValidity
+// -----------------------------------------------------------------------------
+//
+TBool TMSRPHeaderUtil::CheckStringValidity( const TDesC8& aString )
+	{
+	if ( !aString.Length() )
+		{
+		return EFalse;
+		}
+	
+	// Checks the syntax for the Content-Type string only. May need to extend to other headers as well
+	
+	TChar charToFind( KDividedCharacter );
+	TInt matchLoc = aString.Locate( charToFind );
+	if( matchLoc == KErrNotFound || matchLoc == (aString.Length() -1) )
+	    {
+        return EFalse;
+	    }
+	
+	TPtrC8 typePtr = aString.Left(matchLoc);
+	TLex8 lex( typePtr );
+	TChar chr = lex.Get();
+	while ( chr )
+		{
+		if ( !chr.IsAlphaDigit() && chr != '!' && chr != '#' && chr != '$' && chr != '%' && chr != '&' &&
+		      chr != '\'' && chr != '*' && chr != '+' && chr != '-' && chr != '.' && chr != '^' && 
+		      chr != '_' && chr != '`' && chr != '{' && chr != '|' && chr != '}' && chr != '~' )
+			{
+			return EFalse;
+			}
+		chr = lex.Get();
+		}
+	
+	TPtrC8 subtypePtr = aString.Mid( matchLoc+1 );
+	lex.Assign( subtypePtr );
+	chr = lex.Get();
+	while ( chr )
+        {
+        if ( !chr.IsAlphaDigit() && chr != '!' && chr != '#' && chr != '$' && chr != '%' && chr != '&' &&
+              chr != '\'' && chr != '*' && chr != '+' && chr != '-' && chr != '.' && chr != '^' && 
+              chr != '_' && chr != '`' && chr != '{' && chr != '|' && chr != '}' && chr != '~' )
+            {
+            return EFalse;
+            }
+        chr = lex.Get();
+        }
+
+	return ETrue;
+	}
+
+// End of File