/**

* Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "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:

* Declaration of CSBECompressionAndEncryption class.

* 

*

*/

/**

 @file

*/

#ifndef __SBECOMPRESSIONANDENCRYPTION_H__

#define __SBECOMPRESSIONANDENCRYPTION_H__

#include <e32base.h>

#include "sbtypes.h"

// Forwards

class CARC4;

namespace conn

	{

	// Forwards

	class CSecureBUREncryptKeySource;

	/** Constants used in the class below

	@internalTechnology

	*/	

	const TInt KKeySize = 32;

	/** Constants used in the class below

	@internalTechnology

	*/	

	const TInt KEncryptionBufferSize = 256;

	// Template classes for handling byte alignment issues

	template<class T> void ReadL(T& aT, TPtr8& aBuffer);

	template<class T> void WriteL(T& aT, TPtr8& aBuffer);

	/** Type: Compression Header

	@internalTechnology

	*/

	class TCompressionHeader

		{

	public:

		TInt	iCompressedSize;

		TInt	iUncompressedSize;

		};

	/** Type: Encryption Header

	@internalTechnology

	*/

	class TEncryptionHeader 

		{

	public:

		TBool	iEncrypted;

		TInt	iBufferSize;

		TInt	iTotalSize;

		};

	/** Handles compression and encryption

	@internalTechnology

	*/

	class CSBECompressAndEncrypt : public CBase

		{

		public:

			// Construtors

			static CSBECompressAndEncrypt* NewLC(CSBGenericTransferType*& apTransferType, TPtr8& aInputBlock);

			~CSBECompressAndEncrypt();

			// Methods

			void PackL(TPtr8& aOutputData);

			void FreeReservedSpace(TPtr8& aOutputData);

		private:

			// Constructors

			CSBECompressAndEncrypt();

			void ConstructL(CSBGenericTransferType*& apTransferType, TPtr8& aInputBlock);

		private:

			// Compression statics

			const static TInt iCompressionGrowthSize;

			// Members

			TBool							iDoEncrypt; /*<! To encryption */

			TBool							iGotBuffer; /*<! Do we have an encryption buffer */

			TBuf8<KKeySize>					iKey; /*<! Encryption key */

			TBuf<KEncryptionBufferSize>		iBuffer; /*<! Encryption buffer */

			TPtr8							iActualStart; /*<! Real start of data block */

			TPtr8*							iOffsetStart; /*<! Star of data */

			// Encryption

			CARC4*							iCipher; /*<! Used for encryption */

			TBool							iIsFreed;	/*Is freed reserved memory*/

		};

	/** Handles decompression and decryption

	@internalTechnology

	*/

	class CSBEDecompressAndEncrypt : public CBase

		{

		public:

			// Constructors

			static CSBEDecompressAndEncrypt* NewL();

			static CSBEDecompressAndEncrypt* NewLC();

			~CSBEDecompressAndEncrypt();

			// Methods

			void SetGenericTransferTypeL(CSBGenericTransferType*& apTransferType);

			void SetBuffer(TDesC8& aOutputData);

			TBool NextLC(HBufC8*& apOutput, TBool& aFinished);

		private:

			// Constructors

			CSBEDecompressAndEncrypt();

			// Methods

			void Reset();

			TBool CreateCipherL();

			void MoveAlongL(TPtr8& aPtr, TInt aAmount);

		private:

			// Enum

			enum TTransferType {ENotSet, ESid, EJava, EPackage};

			// Members

			TBool 							iDoDecrypt; /*<! Do decryption */

			TTransferType					iType;

			TPtr8							iCurrentPtr; /*<! Pointer to the current work position */

			TEncryptionHeader				iEncryptionHeader; /*<! An encryption headear */

			TDriveNumber					iDriveNumber; /*<! Drive number */

			TSecureId						iSecureId; /*<! Secure Id */

			TInt							iCount; /*<! Count of data unpacked */

			TCompressionHeader				iCompressionHeader; /*<! A compression header */

			TUid							iPackageId; /*<! A package header */

			HBufC*							iJavaHash; /*<! For storing the java hash */

			// Buffering

			TBool							iGotCompressionHeader; /*<! Have we got the compression header */

			TBool							iDoneDecompression;

			TBool							iGotCipher;

			TInt							iCompressionSizeRead; /*<! Used for buffering */

			TInt							iEncryptionSizeRead; 

			HBufC8*							iBuffer;

			// Encryption

			CARC4*							iCipher; /*<! Used for encryption */

		};

	}

#endif // __SBECOMPRESSIONANDENCRYPTION_H__