| 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) 1998-2009 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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* |
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*/ |
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|
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|
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#include "asn1dec.h" |
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|
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EXPORT_C TASN1DecGeneric::TASN1DecGeneric(const TDesC8& aSource): |
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iEncoding(aSource) |
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{
|
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} |
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|
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EXPORT_C void TASN1DecGeneric::InitL() |
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|
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// x209 6.2, 6.3 |
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{
|
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if(iEncoding.Length() < KASN1ObjectMinLength) |
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{
|
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User::Leave(KErrArgument); |
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} |
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|
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TInt i=iEncoding[0]; |
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TInt b=i>>6; |
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iClass=(TASN1Class)b; |
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|
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TInt Length=0; |
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TInt LengthOfLength=1; |
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TInt Pos=0; |
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TInt T=0; |
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TInt encodingLength = iEncoding.Length(); |
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// work out tag |
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if ((iEncoding[Pos]&0x1f)==0x1f) |
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{
|
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// tag greater than 30 |
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Pos++; |
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if (encodingLength <= Pos+1) |
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{
|
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User::Leave(KErrArgument); |
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} |
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while (iEncoding[Pos]>=128) |
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{
|
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T<<=7; |
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T+=(TUint8)(iEncoding[Pos]&127); // this raises warning if TTagType is TUint8 |
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Pos++; |
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if (encodingLength <= Pos+1) |
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{
|
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User::Leave(KErrArgument); |
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} |
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} |
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T<<=7; |
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T+=(TUint8)iEncoding[Pos]; |
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} |
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else |
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{
|
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T=(TUint8)(iEncoding[Pos]&0x1f); |
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} |
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iExplicitTag = T; |
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Pos++; |
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|
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TUint8 l = iEncoding[Pos]; |
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if (l > 128) |
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{
|
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// this is a length of length |
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if (encodingLength <= Pos+1) |
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{
|
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User::Leave(KErrArgument); |
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} |
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LengthOfLength=iEncoding[Pos++]&127; |
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Length=0; |
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while (LengthOfLength) |
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{
|
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if (encodingLength <= Pos+1) |
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{
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User::Leave(KErrArgument); |
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} |
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Length<<=8; |
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Length+=iEncoding[Pos++]; |
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LengthOfLength--; |
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} |
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} |
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if (l == 128) |
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{
|
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//this is constructed, indefinite length: we don't support this |
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User::Leave(KErrNotSupported); |
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} |
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if (l < 128) |
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{
|
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//this is a straight length |
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Length = iEncoding[Pos++]; |
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} |
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if (((Length+Pos)>encodingLength) || (Length < 0)) |
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{
|
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User::Leave(KErrArgument); |
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} |
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iStartOfContents = Pos; |
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iLength = Length; |
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} |
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|
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EXPORT_C TPtrC8 TASN1DecGeneric::GetContentDER(void) const |
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{
|
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return iEncoding.Mid(iStartOfContents, iLength); |
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} |
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|
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EXPORT_C TInt TASN1DecGeneric::LengthDER(void) const |
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{
|
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return iLength+iStartOfContents; |
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} |
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|
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EXPORT_C TInt TASN1DecGeneric::LengthDERContent(void) const |
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{
|
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return iLength; |
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} |
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|
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EXPORT_C TInt TASN1DecGeneric::LengthDERHeader() const |
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{
|
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return LengthDER() - LengthDERContent(); |
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} |
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|
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EXPORT_C TPtrC8 TASN1DecGeneric::Encoding() const |
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{
|
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return iEncoding.Left(LengthDER()); |
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} |
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|
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EXPORT_C TTagType TASN1DecGeneric::Tag() const |
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// we can inline this |
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{
|
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return iExplicitTag; |
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} |
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|
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EXPORT_C TASN1Class TASN1DecGeneric::Class() const |
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// we can inline this |
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{
|
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return iClass; |
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} |
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