// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "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:

//

#include <e32base.h>

#include <e32def.h>

#include <f32file.h> // for CFileImportBuffer

#include <s32file.h>

#include <s32stor.h>

#include <inbuf.h>

//

// class CImportBufferBase

//

EXPORT_C CImportBufferBase::CImportBufferBase(TInt aSize)

	:iMaxSize(aSize)

	{}

EXPORT_C CImportBufferBase::~CImportBufferBase()

	{

	delete iImportBuffer;

	}

EXPORT_C void CImportBufferBase::ConstructL()

	{

	iImportBuffer=HBufC8::NewL(iMaxSize);

	ResetImportBuffer();

	}

EXPORT_C void CImportBufferBase::ResetImportBuffer()

//

	{

	iReadPtr=CONST_CAST(TText8*,iImportBuffer->Ptr());

	iTBase=iReadPtr;

	iEndBuf=iReadPtr;

	}

EXPORT_C void CImportBufferBase::ResetReadPtr()

	{

	iReadPtr=iTBase;

	}

EXPORT_C TInt CImportBufferBase::ReadL(TText8& aByte)

	{

 	if (iReadPtr == iEndBuf)

		{

		TInt err = FillImportBuf();

		if (err)

			return err;

		}

	aByte = *(iReadPtr++);

	return KErrNone;

	}

EXPORT_C TInt CImportBufferBase::SeekL(TSeek /*aSeekMode*/, TInt /*anOffset*/)

	{

	// not implemented

	return KErrNotSupported;

	}

EXPORT_C TInt CImportBufferBase::MaxSize()

	{

	return iMaxSize;

	}

EXPORT_C void CImportBufferBase::SetLength(TInt aLength)

	{

	iEndBuf=iTBase+aLength;

	}

//

// class CFileImportBuffer

//

EXPORT_C CFileImportBuffer::CFileImportBuffer(RFile aSource, TInt aMaxSize)

	: CImportBufferBase(aMaxSize), iSource(aSource)

	{}

EXPORT_C TInt CFileImportBuffer::SeekL(TSeek aSeekMode, TInt anOffset)

	{

	TInt err=iSource.Seek(aSeekMode, anOffset);

	if (err==KErrNone)

		return FillImportBuf();

	else

		return err;

	}

EXPORT_C TInt CFileImportBuffer::FillImportBuf()

	{

  	TPtr8 buf=iImportBuffer->Des();

	iSource.Read(buf,MaxSize());

	SetLength(buf.Length());

	ResetReadPtr();

	if (buf.Length() == 0)

		return KErrEndOfInput;

	else

		return KErrNone;

	}