author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 24 Sep 2009 12:53:48 +0300 | |
changeset 17 | c8a366e56285 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Implementation of CFileReader |
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* |
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*/ |
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// INCLUDE FILES |
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#include "ResourceHandle.h" |
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#include "FileConnection.h" |
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#include "FileReader.h" |
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// EXTERNAL DATA STRUCTURES |
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// EXTERNAL FUNCTION PROTOTYPES |
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// CONSTANTS |
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// MACROS |
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// LOCAL CONSTANTS AND MACROS |
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// MODULE DATA STRUCTURES |
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// LOCAL FUNCTION PROTOTYPES |
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// FORWARD DECLARATIONS |
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// ============================= LOCAL FUNCTIONS =============================== |
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// ============================ MEMBER FUNCTIONS =============================== |
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// ----------------------------------------------------------------------------- |
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// CFileReader::CFileReader |
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// C++ default constructor can NOT contain any code, that |
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// might leave. |
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// ----------------------------------------------------------------------------- |
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// |
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CFileReader::CFileReader(RFile& aFile, TInt aChunkSize, FileConnection* aFileConnection) |
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: CActive( CActive::EPriorityHigh ), |
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m_file( aFile ), m_chunkSize( aChunkSize ), m_fileConnection( aFileConnection ), |
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m_chunkBufPtr( NULL, 0 ), m_stopReading( EFalse ) |
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{ |
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CActiveScheduler::Add( this ); |
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} |
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// ----------------------------------------------------------------------------- |
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// CFileReader::ConstructL |
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// Symbian 2nd phase constructor can leave. |
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// ----------------------------------------------------------------------------- |
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// |
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void CFileReader::ConstructL() |
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{ |
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m_chunkBuffer = HBufC8::NewL( m_chunkSize ); |
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// |
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m_chunkBufPtr.Set( (TUint8*)m_chunkBuffer->Des().Ptr(), m_chunkSize, m_chunkSize ); |
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} |
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// ----------------------------------------------------------------------------- |
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// CFileReader::NewL |
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// Two-phased constructor. |
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// ----------------------------------------------------------------------------- |
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// |
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CFileReader* CFileReader::NewL(RFile& aFile, TInt aChunkSize, FileConnection* aFileConnection) |
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{ |
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CFileReader* self = new( ELeave ) CFileReader( aFile, aChunkSize, aFileConnection ); |
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CleanupStack::PushL( self ); |
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self->ConstructL(); |
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CleanupStack::Pop(); |
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return self; |
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} |
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// Destructor |
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CFileReader::~CFileReader() |
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{ |
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Cancel(); |
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// |
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delete m_chunkBuffer; |
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} |
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// ----------------------------------------------------------------------------- |
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// CFileReader::StartReading |
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// |
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// |
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// ----------------------------------------------------------------------------- |
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// |
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void CFileReader::StartReading() |
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{ |
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// |
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m_filePos = 0; |
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// start reading |
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ReadFile(); |
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} |
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// ----------------------------------------------------------------------------- |
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// CFileReader::StopReading |
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// |
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// |
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// ----------------------------------------------------------------------------- |
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// |
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void CFileReader::StopReading() |
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{ |
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m_stopReading = ETrue; |
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} |
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// ----------------------------------------------------------------------------- |
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// CFileReader::GetChunkBuffer |
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// |
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// |
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// ----------------------------------------------------------------------------- |
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// |
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void CFileReader::GetChunkBuffer( TPtrC8& aChunkBuffer ) |
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{ |
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aChunkBuffer.Set( m_chunkBufPtr ); |
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} |
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// ----------------------------------------------------------------------------- |
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// CFileReader::DoCancel |
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// |
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// |
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// ----------------------------------------------------------------------------- |
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// |
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void CFileReader::DoCancel() |
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{ |
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if (IsActive()) { |
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m_file.ReadCancel(iStatus); |
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} |
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} |
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// ----------------------------------------------------------------------------- |
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// CFileReader::RunL |
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// |
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// |
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// ----------------------------------------------------------------------------- |
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// |
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void CFileReader::RunL() |
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{ |
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// do not send the chunk back to the transaction if the trans has been cancelled |
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if( !m_stopReading ) { |
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switch( iStatus.Int() ) |
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{ |
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case KErrNone: |
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{ |
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TInt bytesRead = m_chunkBufPtr.Length(); |
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// 0 means we read beyond the file |
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if( bytesRead ) { |
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// let the observer know. |
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m_fileConnection->response(); |
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// If it is not Browser content, reading the file |
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// is canceled in FileConnection::download(). |
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if( !m_stopReading ) { |
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// fix file pos |
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m_filePos+=bytesRead; |
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// keep on reading |
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ReadFile(); |
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} |
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} |
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else { |
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// let the observer know |
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m_fileConnection->complete(KErrNone); |
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} |
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break; |
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} |
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default: |
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{ |
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// |
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m_fileConnection->complete( iStatus.Int() ); |
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break; |
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} |
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} |
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} |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CFileReader::ReadFile |
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// |
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// |
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// ----------------------------------------------------------------------------- |
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// |
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void CFileReader::ReadFile() |
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{ |
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if( !m_stopReading ) { |
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SetActive(); |
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m_file.Read( m_filePos, m_chunkBufPtr, m_chunkSize, iStatus ); |
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} |
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} |
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|
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|
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// End of File |