author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 24 Sep 2009 12:53:48 +0300 | |
changeset 17 | c8a366e56285 |
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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: Definition of CFileReader |
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* |
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*/ |
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#ifndef CFILEREADER_H |
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#define CFILEREADER_H |
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// INCLUDES |
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#include <e32base.h> |
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#include <f32file.h> |
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// CONSTANTS |
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// MACROS |
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// DATA TYPES |
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enum TFileEvent |
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{ |
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EGotResponseBodyData, |
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ESucceeded, |
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EFailed |
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}; |
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|
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// FUNCTION PROTOTYPES |
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// FORWARD DECLARATIONS |
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class FileConnection; |
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// CLASS DECLARATION |
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/** |
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* This is a simple incremental file reader. |
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* @lib resLoader.lib |
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* @since 3.1 |
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*/ |
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class CFileReader : public CActive |
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{ |
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public: // Constructors and destructor |
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/** |
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* Two-phased constructor. |
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* @since 3.1 |
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* @param aFile File to read. |
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* @param aChunkSize Chunk size to be read in one turn. |
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* @param aFileReaderCallback Observer object-file transaction. |
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* @return File reader object |
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*/ |
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static CFileReader* NewL( RFile& aFile, TInt aChunkSize, FileConnection* aFileConnection ); |
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/** |
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* Destructor. |
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*/ |
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virtual ~CFileReader(); |
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public: // New functions |
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/** |
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* Start reading the file from the beginning. |
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* @since 3.1 |
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* @param |
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* @return void |
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*/ |
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void StartReading(); |
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/** |
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* Stop reading |
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* @since 3.1 |
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* @param |
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* @return void |
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*/ |
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void StopReading(); |
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/** |
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* Get partial body buffer. |
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* @since 3.1 |
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* @param aChunkBuffer Pointer to the partial body buffer |
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* @return void |
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*/ |
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void GetChunkBuffer( TPtrC8& aChunkBuffer ); |
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/** |
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* Purge the chunk buffer. |
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* @since 3.1 |
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* @param |
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* @return void |
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*/ |
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void ReleaseChunkBuffer(); |
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public: // from CActive |
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/** |
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* Cancel active object |
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* @since 3.1 |
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* @param |
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* @return void |
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*/ |
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void DoCancel(); |
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/** |
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* Asynchronous handling of transaction events. |
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* @since 3.1 |
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* @param |
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* @return void |
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*/ |
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void RunL(); |
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private: |
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/** |
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* Construct. |
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* @since 3.1 |
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* @param aFile File to read. |
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* @param aChunkSize Chunk size to be read in one turn. |
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* @param aFileReaderCallback Observer object-file transaction. |
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* @return void |
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*/ |
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CFileReader( RFile& aFile, TInt aChunkSize, FileConnection* aFileConnection ); |
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/** |
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* By default Symbian 2nd phase constructor is private. |
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*/ |
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void ConstructL(); |
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/** |
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* Read from the file from the current position. |
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* @since 3.1 |
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* @param |
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* @return void |
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*/ |
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void ReadFile(); |
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private: // Data |
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// file to read |
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RFile m_file; |
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// actual file position |
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TInt m_filePos; |
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// chunk size to read in one turn |
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TInt m_chunkSize; |
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// chunk buffer |
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HBufC8* m_chunkBuffer; |
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// observer object |
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FileConnection* m_fileConnection; |
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// pointer to the chunk buffer |
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TPtr8 m_chunkBufPtr; |
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// ETrue if the file transaction is cancelled |
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TBool m_stopReading; |
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}; |
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#endif // CFILEREADER_H |
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// End of File |