| author | sl@SLION-WIN7.fritz.box |
| Fri, 15 Jun 2012 03:10:57 +0200 | |
| changeset 0 | bde4ae8d615e |
| permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* Implementation for TASN1EncBase128 class. |
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* |
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*/ |
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|
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|
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#include "base128enc.h" |
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|
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|
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TASN1EncBase128DER::TASN1EncBase128DER(TUint aInt) : iInt(aInt), iLengthDER(0) |
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{
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CalculateLengthDER(); |
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} |
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|
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|
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TUint TASN1EncBase128DER::LengthDER() const |
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{
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return iLengthDER; |
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} |
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|
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|
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void TASN1EncBase128DER::CalculateLengthDER() |
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{
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iLengthDER = 1; |
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TUint working = iInt; |
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while (working >>= 7) |
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{
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++iLengthDER; |
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} |
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} |
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|
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|
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void TASN1EncBase128DER::WriteDERL(TDes8& aBuf, TUint& aPos) const |
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{
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__ASSERT_DEBUG(aBuf.Length() - aPos >= STATIC_CAST(TUint8, iLengthDER), |
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User::Leave(KErrBadDescriptor)); |
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|
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TInt last = aPos + iLengthDER - 1; |
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TUint working = iInt; |
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for (TUint cursor = last; cursor >= aPos; --cursor) |
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{
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// Cast takes least significant 8 bits only (actually, we only need 7) |
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aBuf[cursor] = STATIC_CAST(TUint8, working); |
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aBuf[cursor] |= 0x80; // Top bit always set to 1... |
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working >>= 7; |
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} |
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// ...except top bit on last byte is 0 |
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aBuf[last] &= 0x7F; |
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|
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aPos += iLengthDER; |
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} |