sl@0: /*
sl@0: * Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of the License "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: #include "asn1dec.h"
sl@0: 
sl@0: EXPORT_C TASN1DecGeneric::TASN1DecGeneric(const TDesC8& aSource):
sl@0:  iEncoding(aSource)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void TASN1DecGeneric::InitL()
sl@0: 
sl@0: // x209 6.2, 6.3
sl@0: 	{
sl@0: 	if(iEncoding.Length() < KASN1ObjectMinLength)
sl@0: 		{
sl@0: 		User::Leave(KErrArgument);
sl@0: 		}	
sl@0: 	
sl@0: 	TInt i=iEncoding[0];
sl@0: 	TInt b=i>>6;
sl@0: 	iClass=(TASN1Class)b;
sl@0: 
sl@0: 	TInt Length=0;
sl@0: 	TInt LengthOfLength=1;
sl@0: 	TInt Pos=0;
sl@0: 	TInt T=0;
sl@0: 	TInt encodingLength = iEncoding.Length();
sl@0: 	// work out tag 
sl@0: 	if ((iEncoding[Pos]&0x1f)==0x1f)
sl@0: 		{
sl@0: 		// tag greater than 30
sl@0: 		Pos++;
sl@0: 		if (encodingLength <= Pos+1)
sl@0: 			{
sl@0: 			User::Leave(KErrArgument);
sl@0: 			}
sl@0: 		while (iEncoding[Pos]>=128)
sl@0: 			{
sl@0: 			T<<=7;
sl@0: 			T+=(TUint8)(iEncoding[Pos]&127);		// this raises warning if TTagType is TUint8
sl@0: 			Pos++;
sl@0: 			if (encodingLength <= Pos+1)
sl@0: 				{
sl@0: 				User::Leave(KErrArgument);
sl@0: 				}
sl@0: 			}
sl@0: 		T<<=7;
sl@0: 		T+=(TUint8)iEncoding[Pos];
sl@0: 		}
sl@0: 	else
sl@0: 		{
sl@0: 		T=(TUint8)(iEncoding[Pos]&0x1f);
sl@0: 		}
sl@0: 	iExplicitTag = T;
sl@0: 	Pos++;
sl@0: 
sl@0: 	TUint8 l = iEncoding[Pos];
sl@0: 	if (l > 128)
sl@0: 		{
sl@0: 		// this is a length of length
sl@0: 		if (encodingLength <= Pos+1)
sl@0: 			{
sl@0: 			User::Leave(KErrArgument);
sl@0: 			}
sl@0: 		LengthOfLength=iEncoding[Pos++]&127;
sl@0: 		Length=0;
sl@0: 		while (LengthOfLength)
sl@0: 			{
sl@0: 			if (encodingLength <= Pos+1)
sl@0: 				{
sl@0: 				User::Leave(KErrArgument);
sl@0: 				}
sl@0: 			Length<<=8;
sl@0: 			Length+=iEncoding[Pos++];
sl@0: 			LengthOfLength--;
sl@0: 			}
sl@0: 		}
sl@0: 	if (l == 128)
sl@0: 		{
sl@0: 		//this is constructed, indefinite length: we don't support this
sl@0: 		User::Leave(KErrNotSupported);
sl@0: 		}
sl@0: 	if (l < 128)
sl@0: 		{
sl@0: 		//this is a straight length
sl@0: 		Length = iEncoding[Pos++];
sl@0: 		}
sl@0: 	if (((Length+Pos)>encodingLength) || (Length < 0))
sl@0: 		{
sl@0: 		User::Leave(KErrArgument);
sl@0: 		}
sl@0: 	iStartOfContents = Pos;
sl@0: 	iLength = Length;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TPtrC8 TASN1DecGeneric::GetContentDER(void) const
sl@0: 	{
sl@0: 	return iEncoding.Mid(iStartOfContents, iLength);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TInt TASN1DecGeneric::LengthDER(void) const
sl@0: 	{
sl@0: 	return iLength+iStartOfContents;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TInt TASN1DecGeneric::LengthDERContent(void) const
sl@0: 	{
sl@0: 	return iLength;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TInt TASN1DecGeneric::LengthDERHeader() const
sl@0: 	{
sl@0: 	return LengthDER() - LengthDERContent();
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TPtrC8 TASN1DecGeneric::Encoding() const
sl@0: 	{
sl@0: 	return iEncoding.Left(LengthDER());
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TTagType TASN1DecGeneric::Tag() const
sl@0: // we can inline this
sl@0: 	{
sl@0: 	return iExplicitTag;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TASN1Class TASN1DecGeneric::Class() const
sl@0: // we can inline this
sl@0: 	{
sl@0: 	return iClass;
sl@0: 	}
sl@0: