1 /*

     2 * Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *

    16 */

    17 

    18 

    19 

    20 

    21 /**

    22  @file

    23 */

    24 

    25 #include <e32std.h>

    26 #include <e32def.h>

    27 #include <asn1enc.h>

    28 #include <asn1dec.h>

    29 

    30 EXPORT_C CASN1EncEncoding::~CASN1EncEncoding()

    31 	{

    32 	delete iContents;

    33 	}

    34 

    35 // Set arbitrary initial values for tag type and class because they will be 

    36 // inited in ConstructL().

    37 EXPORT_C CASN1EncEncoding::CASN1EncEncoding() : 

    38 	CASN1EncBase(EASN1EOC, EUniversal)

    39 	{

    40 	}

    41 

    42 EXPORT_C CASN1EncEncoding* CASN1EncEncoding::NewLC(const TDesC8& aEncoding)

    43 	{

    44 	CASN1EncEncoding* self = new (ELeave) CASN1EncEncoding;

    45 	CleanupStack::PushL(self);

    46 	self->ConstructL(aEncoding);

    47 	return self;

    48 	}

    49 

    50 EXPORT_C CASN1EncEncoding* CASN1EncEncoding::NewL(const TDesC8& aEncoding)

    51 	{

    52 	CASN1EncEncoding* self = NewLC(aEncoding);

    53 	CleanupStack::Pop(self);

    54 	return self;

    55 	}

    56 

    57 EXPORT_C CASN1EncEncoding* CASN1EncEncoding::NewLC(const TDesC8& aEncoding, TTagType aType, TASN1Class aClass)

    58 	{

    59 	CASN1EncEncoding* self = new (ELeave) CASN1EncEncoding;

    60 	CleanupStack::PushL(self);

    61 	self->ConstructL(aEncoding, aType, aClass);

    62 	return self;		

    63 	}

    64 

    65 void CASN1EncEncoding::ConstructL(const TDesC8& aEncoding)

    66 	{

    67 	// Use decoder to get information about the outer wrapper of the passed 

    68 	// encoding.

    69 	TASN1DecGeneric decoder(aEncoding);

    70 	decoder.InitL();

    71 	iClass = decoder.Class();

    72 	iTag = decoder.Tag();

    73 	// Set this information so that the base class knows how to write 

    74 	// DER encoding.

    75 	SetTag(iTag, iClass);

    76 	// Copy just the contents of the passed encoding.

    77 	iContents = decoder.GetContentDER().AllocL();

    78 	// Save this for base class writing functions.

    79 	iContentsLengthDER = iContents->Length();

    80 	// This is base class' method which initializes length of length 

    81 	// encoding for proper DER writing.

    82 	CalculateLengthLengthDER();

    83 	}

    84 

    85 void CASN1EncEncoding::ConstructL(const TDesC8& aEncoding, TTagType aType, TASN1Class aClass)

    86 	{

    87 	// Use decoder to get information about the outer wrapper of the passed 

    88 	// encoding.

    89 	TASN1DecGeneric decoder(aEncoding);

    90 	decoder.InitL();

    91 	iClass = aClass;

    92 	iTag = aType;

    93 	// Set this information so that the base class knows how to write 

    94 	// DER encoding.

    95 	SetTag(aType, aClass);

    96 	// Copy just the contents of the passed encoding.

    97 	iContents = decoder.GetContentDER().AllocL();

    98 	// Save this for base class writing functions.

    99 	iContentsLengthDER = iContents->Length();

   100 	// This is base class' method which initializes length of length 

   101 	// encoding for proper DER writing.

   102 	CalculateLengthLengthDER();

   103 	}

   104 

   105 

   106 // This method is not called but is necessary because it overrides a 

   107 // pure virtual function of the base class. The variable is properly 

   108 // initialized in ConstructL().

   109 void CASN1EncEncoding::CalculateContentsLengthDER()

   110 	{

   111 	iContentsLengthDER = iContents->Length();

   112 	}

   113 

   114 TBool CASN1EncEncoding::IsConstructed() const

   115 	{

   116 	return ETrue;

   117 	}

   118 

   119 // When this method is called by the base class write helper, the tag 

   120 // and length are already written.

   121 void CASN1EncEncoding::WriteContentsDERL(TDes8& aBuf) const

   122 	{

   123 	aBuf.Copy(*iContents);

   124 	}