// Copyright (c) 1999-2009 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 "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

 // which accompanies this distribution, and is available

 // at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

 //

 // Initial Contributors:

 // Nokia Corporation - initial contribution.

 //

 // Contributors:

 //

 // Description:

 // This file contains the header file of the CSmsBuffers.

 // 

 //

 /**

  @file

 */

 #ifndef __GSMUBUF_H__

 #define __GSMUBUF_H__

 #include <e32std.h>

 #include <s32strm.h>

 class CEditableText;

 class RReadStream;

 class RWriteStream;

 /**

  *  The base class for all SMS buffers.

  *  @publishedAll

  *  @released

  */

 class CSmsBufferBase : public CBase

 	{

 public:

 	enum

 		{

 		EMaxBufLength=0x100

 		};

 public:

 	/**

 	 *  Gets the number of characters in the buffer.

 	 *  

 	 *  	@return The number of characters in the buffer. 

 	 */

 	virtual TInt Length() const=0;

 	/**

 	 *  Extracts buffer data to a descriptor.

 	 *  

 	 *  @param aBuf On return, buffer data

 	 *  @param aPos Position within buffer to begin reading

 	 *  	@param aLength The number of bytes to read from the buffer 

 	 */

 	virtual void Extract(TDes& aBuf,TInt aPos,TInt aLength) const=0;

 	/**

 	 *  Inserts data into the buffer.

 	 *  

 	 *  @param aPos Position in the buffer to insert the data

 	 *  	@param aBuf The data to insert into the buffer 

 	 */

 	virtual void InsertL(TInt aPos,const TDesC& aBuf)=0;

 	/**

 	 *  Deletes data from the buffer.

 	 *  

 	 *  @param aPos Position in the buffer to delete the data

 	 *  	@param aLength The number of bytes to delete from the buffer 

 	 */

 	virtual void DeleteL(TInt aPos,TInt aLength)=0;

 	/** Resets the buffer. */

 	virtual void Reset()=0;

 	IMPORT_C void InternalizeL(RReadStream& aStream);

 	IMPORT_C void ExternalizeL(RWriteStream& aStream) const;

 	};

 /**

  *  This is the simplest implementation of CSmsBufferBase.

  *  

  *  It stores the buffer in an array of TTexts.

  *  @publishedAll

  *  @released

  */

 class CSmsBuffer : public CSmsBufferBase

 	{

 public:

 	IMPORT_C static CSmsBuffer* NewL();

 	IMPORT_C ~CSmsBuffer();

 	IMPORT_C TInt Length() const;

 	IMPORT_C void Extract(TDes& aBuf,TInt aPos,TInt aLength) const;

 	IMPORT_C void InsertL(TInt aPos,const TDesC& aBuf);

 	IMPORT_C void DeleteL(TInt aPos,TInt aLength);

 	IMPORT_C void Reset();

 private:

 	CSmsBuffer();

 private:

 	CArrayFix<TText>* iBuffer;

 	};

 /**

  *  SMS buffer, implemented as a thin wrapper over CEditableText.

  *  

  *  This class is designed to be used by the Message Server, which stores SMS

  *  text as CRichText, which is derived from CEditableText.

  *  @publishedAll

  *  @released

  */

 class CSmsEditorBuffer : public CSmsBufferBase

 	{

 public:

 	IMPORT_C static CSmsEditorBuffer* NewL(CEditableText& aText);

 	IMPORT_C ~CSmsEditorBuffer();

 	IMPORT_C TInt Length() const;

 	IMPORT_C void Extract(TDes& aBuf,TInt aPos,TInt aLength) const;

 	IMPORT_C void InsertL(TInt aPos,const TDesC& aBuf);

 	IMPORT_C void DeleteL(TInt aPos,TInt aLength);

 	IMPORT_C void Reset();

 private:

 	CSmsEditorBuffer(CEditableText& aText);

 private:

 	CEditableText& iText;

 	};

 #endif // !defined __GSMUBUF_H__