/*

* Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

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

* which accompanies this distribution, and is available

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

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

* ASN1 decoder

*

*/

/**

 @file 

 @publishedAll

 @released

*/

#ifndef __ASN1DEC_H__

#define __ASN1DEC_H__

#include <e32std.h>

#include <e32base.h>

#include <asn1cons.h>

class RInteger;

class TASN1DecGeneric

	{

public:

	IMPORT_C explicit TASN1DecGeneric(const TDesC8& aSource);

	IMPORT_C void InitL();

	IMPORT_C TPtrC8 Encoding() const;

	IMPORT_C TInt LengthDER() const;

	IMPORT_C TPtrC8 GetContentDER(void) const;

	IMPORT_C TInt LengthDERContent(void) const;

	IMPORT_C TInt LengthDERHeader() const;

	IMPORT_C TTagType Tag() const;

	IMPORT_C TASN1Class Class() const;

private:

	TPtrC8 iEncoding;

	TInt iStartOfContents;

	TInt iLength;

	TTagType iExplicitTag;

	TASN1Class iClass;

	};

class TASN1DecString

	{

public:

protected:

	IMPORT_C TASN1DecString(const TTagType aTag);

	virtual TInt CheckValid(const TDesC8& aSource)=0;

	};

class TASN1DecBoolean

	{

public:

	IMPORT_C TASN1DecBoolean();

	IMPORT_C TBool DecodeDERL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C TBool DecodeDERL(const TASN1DecGeneric& Source);

private:

	};

class TASN1DecNull

	{

public:

	IMPORT_C TASN1DecNull();

	IMPORT_C void DecodeDERL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C void DecodeDERL(const TASN1DecGeneric& aSource);

	};

class TASN1DecEnumerated

	{

public:

	IMPORT_C TASN1DecEnumerated(void);

	};

class TASN1DecInteger

	{

public:

	IMPORT_C TASN1DecInteger();

	IMPORT_C TInt DecodeDERShortL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C TInt DecodeDERShortL(const TASN1DecGeneric& aSource);

	IMPORT_C RInteger DecodeDERLongL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C RInteger DecodeDERLongL(const TASN1DecGeneric& aSource);

	};

const TInt KNumberOfIDs=15;

class TASN1DecObjectIdentifier

	{

public:

	IMPORT_C TASN1DecObjectIdentifier();

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C HBufC* DecodeDERL(const TASN1DecGeneric& aSource);

private:

	TInt DecodeContentsL(TFixedArray<TInt, KNumberOfIDs>& aOID, const TDesC8& aSource);

	};

class TASN1DecSet

	{

public:

	IMPORT_C TASN1DecSet();

	IMPORT_C CArrayPtrFlat<TASN1DecGeneric>* NewDERLC(const TDesC8& aSource);

	IMPORT_C CArrayPtrFlat<TASN1DecGeneric>* DecodeDERLC(const TDesC8& aSource,TInt& aPos);

	IMPORT_C CArrayPtrFlat<TASN1DecGeneric>* DecodeDERLC(const TASN1DecGeneric& aSource);

	IMPORT_C CArrayPtrFlat<TASN1DecGeneric>* DecodeDERLC(const TDesC8& aSource,TInt& aPos, TInt aMin, TInt aMax);

	IMPORT_C CArrayPtrFlat<TASN1DecGeneric>* DecodeDERLC(const TASN1DecGeneric& aSource, TInt aMin, TInt aMax);

protected:

	/** @internalComponent */

	void DecodeContentsL(const TDesC8& aSource, TInt& aPos, CArrayPtrFlat<TASN1DecGeneric>& aDest);

	/** @internalComponent */

	static void CleanupSet(TAny* aArray);	

	};

class TASN1DecGraphicString

	{

public:

	IMPORT_C TASN1DecGraphicString();

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

protected:

	IMPORT_C TInt CheckValid(const TDesC8& aSource);

private:

	HBufC* DecodeContentsL(const TDesC8& aSource);

	};

class TASN1DecVisibleString

	{

public:

	IMPORT_C TASN1DecVisibleString(void);

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

protected:

	IMPORT_C TInt CheckValid(const TDesC8& aSource);

private:

	HBufC* DecodeContentsL(const TDesC8& aSource);

	};

class TASN1DecGeneralizedTime

	{

public:

	IMPORT_C TASN1DecGeneralizedTime();

	IMPORT_C TTime DecodeDERL(const TDesC8& aSource, TInt& aPos);

	IMPORT_C TTime DecodeDERL(const TASN1DecGeneric& aGen);

private:

	TTime GetTimeL(const TDesC8& aSource);

	};

class TASN1DecUTCTime

	{

public:

	IMPORT_C TASN1DecUTCTime();

	IMPORT_C TTime DecodeDERL(const TASN1DecGeneric& aGen);

	IMPORT_C TTime DecodeDERL(const TDesC8& aSource, TInt& aPos);

private:

	TTime GetTimeL(const TDesC8& aSource);

	};

class TASN1DecBitString

	{

public:

	IMPORT_C TASN1DecBitString();

	IMPORT_C HBufC8* DecodeDERL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C HBufC8* DecodeDERL(const TASN1DecGeneric& aSource);

	//we need the next 2 functions because many standards encode things as bit

	//strings

	IMPORT_C HBufC8* ExtractOctetStringL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C HBufC8* ExtractOctetStringL(const TASN1DecGeneric& aSource);

	};

class TASN1DecIA5String

	{

public:

	IMPORT_C TASN1DecIA5String();

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C HBufC* DecodeDERL(const TASN1DecGeneric& aSource);

protected:

	IMPORT_C TInt CheckValid(const TDesC8& aSource);

private:

	HBufC* DecodeContentsL(const TDesC8& aSource);

	};

class TASN1DecUTF8String

	{

public:

	IMPORT_C TASN1DecUTF8String();

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C HBufC* DecodeDERL(const TASN1DecGeneric& aSource);

protected:

	IMPORT_C TInt CheckValid(const TDesC8& aSource);

private:

	HBufC* DecodeContentsL(const TDesC8& aSource);

	};

class TASN1DecGeneralString

	{

public:

	IMPORT_C TASN1DecGeneralString();

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

protected:

	IMPORT_C TInt CheckValid(const TDesC8& aSource);

private:

	HBufC* DecodeContentsL(const TDesC8& aSource);

	};

class TASN1DecOctetString

	{

public:

	IMPORT_C TASN1DecOctetString();

	IMPORT_C HBufC8* DecodeDERL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C HBufC8* DecodeDERL(const TASN1DecGeneric& aSource);

protected:

	IMPORT_C TInt CheckValid(const TDesC8& aSource);

	};

class TASN1DecNumericString

	{

public:

	IMPORT_C TASN1DecNumericString();

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

protected:

	/** @internalComponent */

	TInt CheckValid(const TDesC8& aSource);

private:

	HBufC* DecodeContentsL(const TDesC8& aSource);

	};

class TASN1DecVideotexString

	{

public:

	IMPORT_C TASN1DecVideotexString();

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

protected:

	IMPORT_C TInt CheckValid(const TDesC8& aSource);

private:

	HBufC* DecodeContentsL(const TDesC8& aSource);

	};

class TASN1DecPrintableString

	{

public:

	IMPORT_C TASN1DecPrintableString();

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C HBufC* DecodeDERL(const TASN1DecGeneric& aSource);

protected:

	/** @internalComponent */

	TInt CheckValid(const TDesC8& aSource);

private:

	HBufC* DecodeContentsL(const TDesC8& aSource);

	};

/**

 * Class used for decoding Teletex strings.

 * The TeletexString type is not fully supported by this library.

 * Instead the decode methods perform a direct conversion from 8 to 16bits by adding 

 * null characters in the second byte of each character. This will work as expected 

 * for cases where the string contains ASCII data.

 * As this is non-destructive, the original data can be retrieved by performing 

 * a Copy to an 8-bit descriptor.

 */

class TASN1DecTeletexString

	{

public:

	IMPORT_C TASN1DecTeletexString();

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C HBufC* DecodeDERL(const TASN1DecGeneric& Source);

protected:

	IMPORT_C TInt CheckValid(const TDesC8& aSource);

private:

	HBufC* DecodeContentsL(const TDesC8& aSource);

	};

/**

Class used for decoding ASN.1 BMP strings.

 */

class TASN1DecBMPString

	{

public:

	IMPORT_C TASN1DecBMPString();

	IMPORT_C HBufC* DecodeDERL(const TDesC8& aSource,TInt& aPos);

	IMPORT_C HBufC* DecodeDERL(const TASN1DecGeneric& aSource);

protected:

	IMPORT_C TInt CheckValid(const TDesC8& aSource);

private:

	HBufC* DecodeContentsL(const TDesC8& aSource);

	};

class TASN1DecSequence

	{

public:

	IMPORT_C TASN1DecSequence();

	IMPORT_C CArrayPtrFlat<TASN1DecGeneric>* DecodeDERLC(const TDesC8& aSource,TInt& aPos);

	IMPORT_C CArrayPtrFlat<TASN1DecGeneric>* DecodeDERLC(const TASN1DecGeneric& aSource);

	IMPORT_C CArrayPtrFlat<TASN1DecGeneric>* DecodeDERLC(const TDesC8& aSource,TInt& aPos, TInt aMin, TInt aMax);

	IMPORT_C CArrayPtrFlat<TASN1DecGeneric>* DecodeDERLC(const TASN1DecGeneric& aSource, TInt aMin, TInt aMax);

protected:

	/** @internalComponent */

	void DecodeContentsL(const TDesC8& aSource, CArrayPtrFlat<TASN1DecGeneric>& aDest);

	/** @internalComponent */

	static void CleanupSequence(TAny* aArray);

	};

#endif