--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cryptoservices/certificateandkeymgmt/asn1/genericdec.cpp	Wed Jul 08 11:25:26 2009 +0100
@@ -0,0 +1,147 @@
+/*
+* Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "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 "asn1dec.h"
+
+EXPORT_C TASN1DecGeneric::TASN1DecGeneric(const TDesC8& aSource):
+ iEncoding(aSource)
+	{
+	}
+
+EXPORT_C void TASN1DecGeneric::InitL()
+
+// x209 6.2, 6.3
+	{
+	if(iEncoding.Length() < KASN1ObjectMinLength)
+		{
+		User::Leave(KErrArgument);
+		}	
+	
+	TInt i=iEncoding[0];
+	TInt b=i>>6;
+	iClass=(TASN1Class)b;
+
+	TInt Length=0;
+	TInt LengthOfLength=1;
+	TInt Pos=0;
+	TInt T=0;
+	TInt encodingLength = iEncoding.Length();
+	// work out tag 
+	if ((iEncoding[Pos]&0x1f)==0x1f)
+		{
+		// tag greater than 30
+		Pos++;
+		if (encodingLength <= Pos+1)
+			{
+			User::Leave(KErrArgument);
+			}
+		while (iEncoding[Pos]>=128)
+			{
+			T<<=7;
+			T+=(TUint8)(iEncoding[Pos]&127);		// this raises warning if TTagType is TUint8
+			Pos++;
+			if (encodingLength <= Pos+1)
+				{
+				User::Leave(KErrArgument);
+				}
+			}
+		T<<=7;
+		T+=(TUint8)iEncoding[Pos];
+		}
+	else
+		{
+		T=(TUint8)(iEncoding[Pos]&0x1f);
+		}
+	iExplicitTag = T;
+	Pos++;
+
+	TUint8 l = iEncoding[Pos];
+	if (l > 128)
+		{
+		// this is a length of length
+		if (encodingLength <= Pos+1)
+			{
+			User::Leave(KErrArgument);
+			}
+		LengthOfLength=iEncoding[Pos++]&127;
+		Length=0;
+		while (LengthOfLength)
+			{
+			if (encodingLength <= Pos+1)
+				{
+				User::Leave(KErrArgument);
+				}
+			Length<<=8;
+			Length+=iEncoding[Pos++];
+			LengthOfLength--;
+			}
+		}
+	if (l == 128)
+		{
+		//this is constructed, indefinite length: we don't support this
+		User::Leave(KErrNotSupported);
+		}
+	if (l < 128)
+		{
+		//this is a straight length
+		Length = iEncoding[Pos++];
+		}
+	if (((Length+Pos)>encodingLength) || (Length < 0))
+		{
+		User::Leave(KErrArgument);
+		}
+	iStartOfContents = Pos;
+	iLength = Length;
+	}
+
+EXPORT_C TPtrC8 TASN1DecGeneric::GetContentDER(void) const
+	{
+	return iEncoding.Mid(iStartOfContents, iLength);
+	}
+
+EXPORT_C TInt TASN1DecGeneric::LengthDER(void) const
+	{
+	return iLength+iStartOfContents;
+	}
+
+EXPORT_C TInt TASN1DecGeneric::LengthDERContent(void) const
+	{
+	return iLength;
+	}
+
+EXPORT_C TInt TASN1DecGeneric::LengthDERHeader() const
+	{
+	return LengthDER() - LengthDERContent();
+	}
+
+EXPORT_C TPtrC8 TASN1DecGeneric::Encoding() const
+	{
+	return iEncoding.Left(LengthDER());
+	}
+
+EXPORT_C TTagType TASN1DecGeneric::Tag() const
+// we can inline this
+	{
+	return iExplicitTag;
+	}
+
+EXPORT_C TASN1Class TASN1DecGeneric::Class() const
+// we can inline this
+	{
+	return iClass;
+	}