1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/security/cryptoservices/certificateandkeymgmt/asn1/base128enc.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,64 @@
     1.4 +/*
     1.5 +* Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.6 +* All rights reserved.
     1.7 +* This component and the accompanying materials are made available
     1.8 +* under the terms of the License "Eclipse Public License v1.0"
     1.9 +* which accompanies this distribution, and is available
    1.10 +* at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.11 +*
    1.12 +* Initial Contributors:
    1.13 +* Nokia Corporation - initial contribution.
    1.14 +*
    1.15 +* Contributors:
    1.16 +*
    1.17 +* Description: 
    1.18 +* Implementation for TASN1EncBase128 class.
    1.19 +*
    1.20 +*/
    1.21 +
    1.22 +
    1.23 +#include "base128enc.h"
    1.24 +
    1.25 +
    1.26 +TASN1EncBase128DER::TASN1EncBase128DER(TUint aInt) : iInt(aInt), iLengthDER(0)
    1.27 +	{
    1.28 +	CalculateLengthDER();
    1.29 +	}
    1.30 +
    1.31 +
    1.32 +TUint TASN1EncBase128DER::LengthDER() const
    1.33 +	{
    1.34 +	return iLengthDER;
    1.35 +	}
    1.36 +
    1.37 +
    1.38 +void TASN1EncBase128DER::CalculateLengthDER()
    1.39 +	{
    1.40 +	iLengthDER = 1;
    1.41 +	TUint working = iInt;
    1.42 +	while (working >>= 7)
    1.43 +		{
    1.44 +		++iLengthDER;
    1.45 +		}
    1.46 +	}
    1.47 +
    1.48 +
    1.49 +void TASN1EncBase128DER::WriteDERL(TDes8& aBuf, TUint& aPos) const
    1.50 +	{
    1.51 +	__ASSERT_DEBUG(aBuf.Length() - aPos >= STATIC_CAST(TUint8, iLengthDER), 
    1.52 +		User::Leave(KErrBadDescriptor));
    1.53 +
    1.54 +	TInt last = aPos + iLengthDER - 1;
    1.55 +	TUint working = iInt;
    1.56 +	for (TUint cursor = last; cursor >= aPos; --cursor)
    1.57 +		{
    1.58 +		// Cast takes least significant 8 bits only (actually, we only need 7)
    1.59 +		aBuf[cursor] = STATIC_CAST(TUint8, working);
    1.60 +		aBuf[cursor] |= 0x80; // Top bit always set to 1...
    1.61 +		working >>= 7;
    1.62 +		}
    1.63 +	// ...except top bit on last byte is 0
    1.64 +	aBuf[last] &= 0x7F;
    1.65 +
    1.66 +	aPos += iLengthDER;
    1.67 +	}