mulwidgets/mullogging/src/mullogchunk.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:56:02 +0200
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/*
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* Copyright (c) 2006-2007 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 "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:  Logging to chunk wrappe for Mul
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*
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*/
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// CLASS HEADER
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#include "mullogchunk.h"
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// EXTERNAL INCLUDES
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#include <e32svr.h>
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// LOCAL DECLARATIONS
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namespace
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	{
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	// size for the chunks
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	const TInt KLogChunkSize = 1000000; // 1 million bytes
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	// name for chunk 1
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	_LIT( KLogChunk1Name, "MUL_Logchunk1" );
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	// name for chunk 2
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	_LIT( KLogChunk2Name, "MUL_Logchunk2" );
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	// extension for log file
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	_LIT( KLogFileExtension, ".log" );
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	// carriage return / line feed
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	_LIT8( KLogCR, "\r" );
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	_LIT8( KLogLF, "\n" );
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	// constant for machine word alignment
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	const TInt KBytesInAWord = sizeof( TInt32 );
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	}
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inline void Panic(TInt aReason)
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    {
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	_LIT(applicationName,"Mul Logging");
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    User::Panic(applicationName, aReason);
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    }
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// -----------------------------------------------------------------------------
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// RMulLogUtility::Open
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// -----------------------------------------------------------------------------
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TInt RMulLogUtility::Open( const TDesC& aName, TBool aReadOnly )
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	{
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	// open the chunk
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	return iChunk.OpenGlobal( aName, aReadOnly );
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	}
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// -----------------------------------------------------------------------------
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// RMulLogUtility::CreateL
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// -----------------------------------------------------------------------------
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void RMulLogUtility::CreateL( const TDesC& aName )
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    {
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	// create the chunk, leave if error
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	TInt error = iChunk.CreateGlobal( aName, KLogChunkSize, KLogChunkSize  );
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	// dont treate already exists as an error
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	if( KErrAlreadyExists == error )
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		{
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		// open in read-write
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		User::LeaveIfError( iChunk.OpenGlobal( aName, EFalse ) );
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		}
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	else
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		{
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		User::LeaveIfError( error );
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		}
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    // initialise the iChunk to all zeros.
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    Mem::FillZ( iChunk.Base(), iChunk.Size() );
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    // initialise current address to base
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    SetCurrentAddress( BaseAddress() );
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    // initialise last logged address to base
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    SetLastLoggedAddress( BaseAddress() );
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    }
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// -----------------------------------------------------------------------------
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// RMulLogUtility::Close
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// -----------------------------------------------------------------------------
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void RMulLogUtility::Close()
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	{
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	iChunk.Close();
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	}
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// -----------------------------------------------------------------------------
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// RMulLogUtility::ChunkSize
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// -----------------------------------------------------------------------------
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TInt RMulLogUtility::ChunkSize()
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	{
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	return iChunk.Size();
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	}
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// -----------------------------------------------------------------------------
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// RMulLogUtility::Id
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// -----------------------------------------------------------------------------
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TObjectId RMulLogUtility::Id()
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	{
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	// take chunk base address
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	TUint8* ptr_in_chunk = iChunk.Base();
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	// cast that to TObjectId*
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	TObjectId* ptr_as_tobjectid = reinterpret_cast< TObjectId* >( ptr_in_chunk );
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	// return the id
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	return *ptr_as_tobjectid;
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	}
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// -----------------------------------------------------------------------------
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// RMulLogUtility::SetId
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// -----------------------------------------------------------------------------
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void RMulLogUtility::SetId( TObjectId aId )
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	{
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	// take chunk base address
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	TUint8* ptr_in_chunk = iChunk.Base();
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	// cast that to TObjectId*
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	TObjectId* ptr_as_tobjectid = reinterpret_cast< TObjectId* >( ptr_in_chunk );
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	// assign the id in place
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	*ptr_as_tobjectid = aId;
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	}
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// -----------------------------------------------------------------------------
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// RMulLogUtility::CurrentAddress
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// -----------------------------------------------------------------------------
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TUint8* RMulLogUtility::CurrentAddress()
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	{
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	// take chunk base address plus object id
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	TUint8* ptr_in_chunk = iChunk.Base() + sizeof( TObjectId );
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	// cast that to TInt*
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	TUint32* ptr_as_tint = reinterpret_cast< TUint32* >( ptr_in_chunk );
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	// dereference that pointer to read the 32 bits that are the address
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	TUint32 value_of_pointer = *ptr_as_tint;
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	// then return the value as TUint8*
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	return reinterpret_cast< TUint8* >( value_of_pointer );
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	}
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// -----------------------------------------------------------------------------
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// RMulLogUtility::SetCurrentAddress
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// -----------------------------------------------------------------------------
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void RMulLogUtility::SetCurrentAddress( TUint8* aValue )
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	{
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	// take chunk base address plus object id
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	TUint8* ptr_in_chunk = iChunk.Base() + sizeof( TObjectId );
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	// cast that to TInt*
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	TUint32* ptr_as_tint = reinterpret_cast< TUint32* >( ptr_in_chunk );
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	// assign the addres to TInt
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	TUint32 new_value = reinterpret_cast< TUint32 >( aValue );
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	// ensure we're byte aligned - ARM requires 32 bit alignment to machine word
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	// boundary!!
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	TInt remainder = new_value % KBytesInAWord;
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	if ( remainder > 0 )
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	    {
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	    new_value += ( KBytesInAWord - remainder );
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	    }
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	// set the new value to the chunk
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	*ptr_as_tint = new_value;
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	}
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// -----------------------------------------------------------------------------
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// RMulLogUtility::LastLoggedAddress
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// -----------------------------------------------------------------------------
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TUint8* RMulLogUtility::LastLoggedAddress()
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	{
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	// take chunk base address plus object id plus one pointer
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	TUint8* ptr_in_chunk = 
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		iChunk.Base() + sizeof( TObjectId ) + sizeof( TUint8* );
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	// cast that to TInt*
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	TUint32* ptr_as_tint = reinterpret_cast< TUint32* >( ptr_in_chunk );
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	// dereference that pointer to read the 32 bits that are the address
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	TUint32 value_of_pointer = *ptr_as_tint;
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	// then return the value as TUint8*
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	return reinterpret_cast< TUint8* >( value_of_pointer );
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	}
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// -----------------------------------------------------------------------------
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// RMulLogUtility::SetLastLoggedAddress
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// -----------------------------------------------------------------------------
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void RMulLogUtility::SetLastLoggedAddress( TUint8* aValue )
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	{
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	// take chunk base address plus object id plus one pointer
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	TUint8* ptr_in_chunk = 
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		iChunk.Base() + sizeof( TObjectId ) + sizeof( TUint8* );
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	// cast that to TInt*
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	TUint32* ptr_as_tint = reinterpret_cast< TUint32* >( ptr_in_chunk );
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	// assign the addres to TInt
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	TUint32 new_value = reinterpret_cast< TUint32 >( aValue );
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	// ensure we're byte aligned - ARM requires 32 bit alignment to machine word
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	// boundary!!
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    TInt remainder = new_value % KBytesInAWord;
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	if ( remainder > 0 )
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	    {
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	    new_value += ( KBytesInAWord - remainder );
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	    }	
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	// set the new value to the chunk
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	*ptr_as_tint = new_value;
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	}
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// -----------------------------------------------------------------------------
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// RMulLogUtility::BaseAddress
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// -----------------------------------------------------------------------------
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TUint8* RMulLogUtility::BaseAddress()
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	{
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	// take chunks base address
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	TUint8* base = iChunk.Base();
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	// calculate the topmost write address, our header is 
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	// TObjectId and two TUint8*
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	return base + sizeof( TObjectId ) + sizeof( TUint8* ) * 2;
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	}
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// -----------------------------------------------------------------------------
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// RMulLogUtility::LastAddress
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// -----------------------------------------------------------------------------
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TUint8* RMulLogUtility::LastAddress()
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	{
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	// return chunks base address plus its size
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	return iChunk.Base() + iChunk.Size();
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	}
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// -----------------------------------------------------------------------------
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// RMulLogClient::Open
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// -----------------------------------------------------------------------------
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EXPORT_C TInt RMulLogClient::Open( TObjectId aId )
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    {
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    // try to open first log chunk, in read-write mode
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    TInt err = iLogUtility.Open( KLogChunk1Name(), EFalse );
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    if ( err != KErrNone )
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   231
        {
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        return err;
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        }
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    // check id
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    TObjectId id = iLogUtility.Id();
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    if ( id  == TObjectId( 0 ) )
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        {
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        // no id set, so reserve this for us and use this chunk
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        iLogUtility.SetId( aId );
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        }
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    // check if our id was there?
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    else if( id != aId )
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        {
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        // not our chunk, try second chunk in read-write mode
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        err = iLogUtility.Open( KLogChunk2Name(), EFalse );
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        if ( err != KErrNone )
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            {
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            return err;
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            }
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        // check id
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        id = iLogUtility.Id();
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        if ( id  == TObjectId( 0 ) )
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            {
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            // no id, reserve this for us and use this chunk
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            iLogUtility.SetId( aId );
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            }
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        else if ( id != aId )
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            {
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            // both chunks already reserved, return error
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            return KErrNotFound;
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   261
            }
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       	}
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    return KErrNone;
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   264
    }
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// -----------------------------------------------------------------------------
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// RMulLogClient::Close
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// -----------------------------------------------------------------------------
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EXPORT_C void RMulLogClient::Close()
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	{
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    iLogUtility.Close();
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	}
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// -----------------------------------------------------------------------------
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// RMulLogClient::Write
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// -----------------------------------------------------------------------------
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EXPORT_C void RMulLogClient::Write( const TDesC8& aLogEntry )
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    {
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    // get the size of log entry (in bytes)
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    TInt num_bytes = aLogEntry.Size();
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    // take current address and chunk size to ensure log entry fits
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    TUint8* current_address = iLogUtility.CurrentAddress();
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    // calculate the new current address, we write the size and the data
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    TUint8* after_write = current_address + num_bytes + sizeof( TInt );
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    // chck that we fit
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   286
    if( after_write >= iLogUtility.LastAddress() )
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   287
    	{
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    	// we dont fit in the end
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   289
    	// need to mark the old current_address so that
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    	// manager knows we jumped to the start
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   291
	    TInt* last_indicator_ptr = 
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	    	reinterpret_cast< TInt* >( current_address );
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	   	// assign KErrNotFound there
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		*last_indicator_ptr = KErrNotFound;
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    	// write this entry to the base address
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   296
    	current_address = iLogUtility.BaseAddress();
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   297
    	}
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   298
    // we need to store the size in the chunk first so take a TInt*
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   299
    TInt* size_ptr = reinterpret_cast< TInt* >( current_address );
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   300
    // assign new value in place
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   301
    *size_ptr = num_bytes;
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   302
    // increase address
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   303
    current_address += sizeof( TInt );
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   304
    // copy the data, first target, then source and last number of bytes
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   305
    Mem::Copy( current_address, aLogEntry.Ptr(), num_bytes );
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   306
    // and set the new current address
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   307
    iLogUtility.SetCurrentAddress( current_address + num_bytes );
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   308
    }
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   309
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   310
// -----------------------------------------------------------------------------
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// RMulLogManager::CreateL
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   312
// -----------------------------------------------------------------------------
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   313
EXPORT_C void RMulLogManager::CreateL()
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   314
    {
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   315
    // connect to the file server
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   316
    User::LeaveIfError( iFs.Connect() );
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   317
    
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   318
    // create two log chunks
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   319
    iLogUtility1.CreateL( KLogChunk1Name );
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   320
    iLogUtility2.CreateL( KLogChunk2Name );
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   321
    }
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   322
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   323
// -----------------------------------------------------------------------------
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   324
// RMulLogManager::Release
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   325
// -----------------------------------------------------------------------------
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   326
EXPORT_C void RMulLogManager::Release()
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   327
    {
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   328
    // close file server handle
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   329
    iFs.Close();
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   330
    
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   331
    // release both log chunks
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   332
    iLogUtility1.Close();
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   333
    iLogUtility2.Close();
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diff changeset
   334
    }
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   335
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   336
// -----------------------------------------------------------------------------
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   337
// RMulLogManager::CommitToFileL
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   338
// -----------------------------------------------------------------------------
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   339
EXPORT_C void RMulLogManager::CommitToFileL( const TDesC& aFolder )
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   340
	{
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   341
	// open the file
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   342
	RFile file;
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   343
	CleanupClosePushL( file );
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   344
	
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   345
	// chunk1
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   346
	// create the file name
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   347
	TFileName fileName;
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   348
	fileName = aFolder;
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   349
	fileName.Append( KLogChunk1Name );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   350
	fileName.Append( KLogFileExtension );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   351
	// try to open the file	
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   352
	TInt err = file.Open( iFs, fileName, EFileWrite );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   353
	if ( err == KErrNotFound )
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   354
	    {
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   355
	    // file doesn't exist so create it
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   356
	    err = file.Create( iFs, fileName, EFileWrite );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   357
	    }
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   358
	User::LeaveIfError( err );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   359
	// write the first chunk to file
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   360
	CommitToFileL( iLogUtility1, file );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   361
	// close the file
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   362
	file.Close();
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   363
	
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   364
	// chunk2
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   365
	// reset the file name
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   366
	fileName.Zero();
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   367
	// create the file name
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   368
	fileName = aFolder;
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   369
	fileName.Append( KLogChunk2Name );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   370
	fileName.Append( KLogFileExtension );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   371
	// try to open the file
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   372
	err = file.Open( iFs, fileName, EFileWrite );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   373
	if ( err == KErrNotFound )
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   374
	    {
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   375
	    // file doesn't exist so create it
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   376
	    err = file.Create( iFs, fileName, EFileWrite );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   377
	    }
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   378
	User::LeaveIfError( err );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   379
	// write the second chunk to file
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   380
	CommitToFileL( iLogUtility2, file );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   381
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   382
	CleanupStack::PopAndDestroy( &file );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   383
	}
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   384
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   385
// -----------------------------------------------------------------------------
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   386
// RMulLogManager::CommitToFileL
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   387
// -----------------------------------------------------------------------------    
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   388
void RMulLogManager::CommitToFileL( RMulLogUtility& aUtility, RFile& aFile )
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   389
    {
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   390
    // Need to explicitly move to the end of the file as it's not done
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   391
    // automatically on call to Write
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   392
    TInt pos = 0;
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   393
    TInt err = aFile.Seek( ESeekEnd, pos );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   394
    User::LeaveIfError( err );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   395
    TPtr8 logEntryPtr( 0, 0 );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   396
    TInt logEntrySize = 0;
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   397
    
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   398
    // what's previously been logged to the file?
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   399
    TUint8* lastLoggedAddress = aUtility.LastLoggedAddress();
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   400
    
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   401
    // how much more has been added to the chunk?
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   402
    TUint8* currentAddress = aUtility.CurrentAddress();
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   403
    
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   404
    // write each of the chunk's logged entries to the file 
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   405
    TInt32* sizePtr = NULL;
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   406
    while ( currentAddress != lastLoggedAddress && err == KErrNone )
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   407
        {
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   408
        // get the logEntry's size
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   409
        sizePtr = reinterpret_cast< TInt32* >( lastLoggedAddress );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   410
        logEntrySize = *sizePtr;
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   411
        if ( logEntrySize == KErrNotFound )
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   412
            {
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   413
            // logged entries have wrapped around the end of the chunk
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   414
            // so start from the beginning
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   415
            lastLoggedAddress = aUtility.BaseAddress();
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   416
            sizePtr = reinterpret_cast< TInt32* >( lastLoggedAddress );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   417
            logEntrySize = *sizePtr;
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   418
            }
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   419
        // set an error - this will be reset to KErrNone if we succeed
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   420
        // with finding and writing a log entry
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   421
        err = KErrNotFound;
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   422
        if ( logEntrySize > 0 )
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   423
            {
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   424
            // move the current address to the data
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   425
            lastLoggedAddress += sizeof( TInt32 );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   426
            // extract the log entry's data 
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   427
            logEntryPtr.Set( lastLoggedAddress, logEntrySize, logEntrySize );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   428
            // write the log entry to the file
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   429
            err = aFile.Write( logEntryPtr );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   430
            // append carriage return and line feed to the entry
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   431
            err = aFile.Write( KLogCR );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   432
            err = aFile.Write( KLogLF );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   433
            // ensure we align to a multiple of a 4-byte boundary
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   434
            TInt remainder = logEntrySize % KBytesInAWord;
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   435
            if ( remainder > 0 )
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   436
                {
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   437
                // not aligned so add some padding
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   438
                logEntrySize += ( KBytesInAWord - remainder );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   439
                }
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   440
 
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   441
            // update the last logged address
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   442
            lastLoggedAddress += logEntrySize;
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   443
            }
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   444
        }
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   445
    // update the last logged address
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   446
    aUtility.SetLastLoggedAddress( lastLoggedAddress );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   447
	// 
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   448
	// commit the data
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   449
	err = aFile.Flush();
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   450
	User::LeaveIfError( err );
e83bab7cf002 Revision: 200949
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   451
    }