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// Copyright (c) 2008-2009 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:
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// e32\debug\crashMonitor\src\scmbytestreamutil.cpp
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// some utility classes for writing data to flash buffer
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//
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//
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/**
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@file
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@internalTechnology
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*/
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#include "scmbytestreamutil.h"
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#include "scmtrace.h"
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namespace Debug
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{
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/**
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* TByteStreamBase Constructor
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* @param aBuffer - pointer to buffer that this utility will use
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*/
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TByteStreamBase::TByteStreamBase(TUint8* aBuffer)
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: iBuffer(aBuffer)
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, iPos(0)
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{
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}
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/**
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* SetPosition
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* @param aBuffer - Sets iPos
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* @return void
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*/
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void TByteStreamBase::SetPosition(TInt aPos)
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{
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iPos = aPos;
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}
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/**
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* CurrentPosition
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* @param aBuffer - Returns the current value of iPos
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* @return Tint
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*/
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TInt TByteStreamBase::CurrentPosition() const
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{
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return iPos;
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}
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/**
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* TByteStreamReader Constructor
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* @param aBuffer - pointer to buffer that this utility will use
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*/
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TByteStreamReader::TByteStreamReader(TUint8* aBuffer)
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: TByteStreamBase(aBuffer)
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{
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}
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/**
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* Constructor for TByteStreamWriter
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* @param aBuffer buffer for writing
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* @param aPhysEnabled whether or not physical writing to another media is enabled
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*/
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TByteStreamWriter::TByteStreamWriter(TUint8* aBuffer, TBool aPhysEnabled)
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: TByteStreamBase(aBuffer)
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, iPhysEnabled(aPhysEnabled)
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, iBytesWritten(0)
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{
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}
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/**
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* Writes a byte to the buffer
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* @param aValue Byte to write
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*/
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void TByteStreamWriter::WriteByte(TUint8 aValue)
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{
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if(iBuffer)
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{
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iBuffer[iPos++] = aValue;
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++iBytesWritten;
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}
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}
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/**
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* Resets the byte counter back to zero
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*/
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void TByteStreamWriter::ResetBytesWritten()
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{
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iBytesWritten = 0;
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}
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/**
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* TCachedByteStreamWriter Constructor
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* @param aBuffer - pointer to buffer that this utility will use
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* @param aCacheSize - suggested length of cache to use if greater than EMaxCache
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* cache length of EMaxCache will be used
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*/
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TCachedByteStreamWriter::TCachedByteStreamWriter(TUint8* aCacheBuffer, TInt aCacheSize, TBool aPhysEnabled)
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: TByteStreamWriter(NULL, aPhysEnabled)
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, iCacheSize(aCacheSize)
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, iCacheBuffer(aCacheBuffer)
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, iPhysicalWriter(NULL)
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{
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}
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/**
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* FlushCache
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* Writes the contents of the cache to buffer amd/or to physical writer implementation
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* if one is currently set
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* @return void
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*/
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TInt TCachedByteStreamWriter::FlushCache()
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{
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TInt padCount = iCacheSize - iPos;
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if(padCount > 0)
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{
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for(TInt i=0;i<padCount;i++)
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{
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iCacheBuffer[iPos++] = 0;
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}
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}
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if(iPhysEnabled)
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{
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if(iPhysicalWriter) // do we have a writer to send the cache data to
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{
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iPhysicalWriter->DoPhysicalWrite(iCacheBuffer, iBytesWritten, iPos);
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}
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}
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iPos = 0;
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return KErrNone;
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}
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/**
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* Writes a byte to the cached buffer
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* @param aValue Byte to write
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*/
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void TCachedByteStreamWriter::WriteByte(TUint8 aValue)
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{
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if(iPos == iCacheSize)
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{
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FlushCache();
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}
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iCacheBuffer[iPos++] = aValue;
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++iBytesWritten;
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}
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/**
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* CurrentPosition
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* @param aBuffer - need to return the position in buffer plus the write pos into cache
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* @return Tint
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*/
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TInt TCachedByteStreamWriter::CurrentPosition() const
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{
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return iBytesWritten;
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}
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/**
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* SetWriterImpl
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* @param aPhysicalWriter - sets the physical writer implementation to be used when the cache is flushed
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* pass NULL to remove a previous writer implementation
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* @return void
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*/
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void TCachedByteStreamWriter::SetWriterImpl(MPhysicalWriterImpl* aPhysicalWriter)
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{
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iPhysicalWriter = aPhysicalWriter;
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}
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}
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//eof
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