/*

* Copyright (c) 2006 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:  Implementation of CFileReader

*

*/

// INCLUDE FILES

#include "ResourceHandle.h"

#include "FileConnection.h"

#include "FileReader.h"

// EXTERNAL DATA STRUCTURES

// EXTERNAL FUNCTION PROTOTYPES  

// CONSTANTS

// MACROS

// LOCAL CONSTANTS AND MACROS

// MODULE DATA STRUCTURES

// LOCAL FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

// ============================= LOCAL FUNCTIONS ===============================

// ============================ MEMBER FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// CFileReader::CFileReader

// C++ default constructor can NOT contain any code, that

// might leave.

// -----------------------------------------------------------------------------

//

CFileReader::CFileReader(RFile& aFile, TInt aChunkSize, FileConnection* aFileConnection) 

    : CActive( CActive::EPriorityHigh ), 

      m_file( aFile ), m_chunkSize( aChunkSize ), m_fileConnection( aFileConnection ),

      m_chunkBufPtr( NULL, 0 ), m_stopReading( EFalse )

{

    CActiveScheduler::Add( this );

}

// -----------------------------------------------------------------------------

// CFileReader::ConstructL

// Symbian 2nd phase constructor can leave.

// -----------------------------------------------------------------------------

//

void CFileReader::ConstructL()

{

    m_chunkBuffer = HBufC8::NewL( m_chunkSize );

    //

    m_chunkBufPtr.Set( (TUint8*)m_chunkBuffer->Des().Ptr(), m_chunkSize, m_chunkSize );

}

// -----------------------------------------------------------------------------

// CFileReader::NewL

// Two-phased constructor.

// -----------------------------------------------------------------------------

//

CFileReader* CFileReader::NewL(RFile& aFile, TInt aChunkSize, FileConnection* aFileConnection) 

{

    CFileReader* self = new( ELeave ) CFileReader( aFile, aChunkSize, aFileConnection );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop();

    return self;

}

// Destructor

CFileReader::~CFileReader()

{

    Cancel();

    //

    delete m_chunkBuffer;

}

// -----------------------------------------------------------------------------

// CFileReader::StartReading

// 

// 

// -----------------------------------------------------------------------------

//

void CFileReader::StartReading()

{

    //

    m_filePos = 0;

    // start reading

    ReadFile();

}

// -----------------------------------------------------------------------------

// CFileReader::StopReading

// 

// 

// -----------------------------------------------------------------------------

//

void CFileReader::StopReading()

{

    m_stopReading = ETrue;

}

// -----------------------------------------------------------------------------

// CFileReader::GetChunkBuffer

// 

// 

// -----------------------------------------------------------------------------

//

void CFileReader::GetChunkBuffer( TPtrC8& aChunkBuffer )

{

    aChunkBuffer.Set( m_chunkBufPtr );

}

// -----------------------------------------------------------------------------

// CFileReader::DoCancel

// 

// 

// -----------------------------------------------------------------------------

//

void CFileReader::DoCancel()

{

    if (IsActive()) {

        m_file.ReadCancel(iStatus);

    }    

}

// -----------------------------------------------------------------------------

// CFileReader::RunL

// 

// 

// -----------------------------------------------------------------------------

//

void CFileReader::RunL()

{

    // do not send the chunk back to the transaction if the trans has been cancelled

    if( !m_stopReading ) {

        switch( iStatus.Int() )

        {

            case KErrNone:

            {

                TInt bytesRead = m_chunkBufPtr.Length();

                // 0 means we read beyond the file 

                if( bytesRead ) {

                    // let the observer know. 

                    m_fileConnection->response();

                    // If it is not Browser content, reading the file

                    // is canceled in FileConnection::download().

                    if( !m_stopReading ) {

                        // fix file pos

                        m_filePos+=bytesRead;

                        // keep on reading

                        ReadFile();

                    }

                }

                else {

                    // let the observer know

                    m_fileConnection->complete(KErrNone);

                }

                break;

            }

            default:

            {

                //

                m_fileConnection->complete( iStatus.Int() );

                break;

            }

        }

    }

}

// -----------------------------------------------------------------------------

// CFileReader::ReadFile

// 

// 

// -----------------------------------------------------------------------------

//

void CFileReader::ReadFile() 

{

    if( !m_stopReading ) {

        SetActive();

        m_file.Read( m_filePos, m_chunkBufPtr, m_chunkSize, iStatus );

    }

}

//  End of File