// Copyright (c) 2006-2009 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:

// GZIP output stream functions

//

#include "xmlenggzipfiledeserializer.h"

#include <ezstream.h>

#include <ezdecompressor.h>

    CXmlEngGZipFileDeserializer* CXmlEngGZipFileDeserializer::NewLC( Xml::CParser* aParser, RFs& aRfs, const TDesC& aGzFileName, TInt aBufSize )

	    {

	    CXmlEngGZipFileDeserializer* bm = new (ELeave) CXmlEngGZipFileDeserializer( aParser );

	    CleanupStack::PushL( bm );

	    bm->ConstructL( aRfs, aGzFileName, aBufSize );

	    return bm;	

	    }

    CXmlEngGZipFileDeserializer* CXmlEngGZipFileDeserializer::NewL( Xml::CParser* aParser, RFs& aRfs, const TDesC& aGzFileName, TInt aBufSize )

	    {

	    CXmlEngGZipFileDeserializer* bm = CXmlEngGZipFileDeserializer::NewLC( aParser, aRfs, aGzFileName, aBufSize );

	    CleanupStack::Pop( bm );

	    return bm;	

	    }

   CXmlEngGZipFileDeserializer::CXmlEngGZipFileDeserializer( Xml::CParser* aParser )

        : iInputDescriptor(NULL,0), iOutputDescriptor(NULL,0)

        {

        iParser = aParser;

        }

   void CXmlEngGZipFileDeserializer::ConstructL( RFs& aRfs, const TDesC& aGzFileName, TInt aBufSize )

        {

        EZGZipFile::LocateAndReadTrailerL(aRfs,aGzFileName,iTrailer);

	    User::LeaveIfError(iInputFile.Open(aRfs,aGzFileName,EFileStream | EFileRead | EFileShareAny));

	    EZGZipFile::ReadHeaderL(iInputFile,iHeader);

	    iCrc = crc32(iCrc,NULL,0);

	    if ( aBufSize <= 0 ) 

	        {

	        User::Leave(KErrArgument);

	        }

	    iInputBuffer = new (ELeave) TUint8[aBufSize];

	    iOutputBuffer = new (ELeave) TUint8[aBufSize];

	    iInputDescriptor.Set(iInputBuffer,0,aBufSize);

	    iOutputDescriptor.Set(iOutputBuffer,0,aBufSize);

	    iDecompressor = CEZDecompressor::NewL(*this,-CEZDecompressor::EMaxWBits);

        }

   CXmlEngGZipFileDeserializer::~CXmlEngGZipFileDeserializer()

        {

        //do NOT destroy iParser

        delete iDecompressor;

        delete[] iInputBuffer;

        delete[] iOutputBuffer;

        iInputFile.Close();

        }

   TBool CXmlEngGZipFileDeserializer::InflateL()

	    {

	    TBool keepGoing = iDecompressor->InflateL();

	    if (!keepGoing)

		    {

		    if (iCrc != iTrailer.iCrc32)

			    User::Leave(KEZlibErrBadGZipCrc);

		    iInputFile.Close();

		    }

	    return keepGoing;

	    }

    void CXmlEngGZipFileDeserializer::InitializeL( CEZZStream& aZStream )

    	{

    	iParser->ParseBeginL();

	    User::LeaveIfError(iInputFile.Read(iInputDescriptor));

	    aZStream.SetInput(iInputDescriptor);

    	aZStream.SetOutput( iOutputDescriptor );

    	}

    void CXmlEngGZipFileDeserializer::NeedInputL( CEZZStream& aZStream )

    	{

	    User::LeaveIfError(iInputFile.Read(iInputDescriptor));

	    aZStream.SetInput(iInputDescriptor);

    	}

    void CXmlEngGZipFileDeserializer::NeedOutputL( CEZZStream& aZStream )

    	{

    	TPtrC8 od = aZStream.OutputDescriptor();

	    iCrc = crc32(iCrc,od.Ptr(),od.Size());    	

    	iParser->ParseL( od );

    	aZStream.SetOutput( iOutputDescriptor );

    	}

    void CXmlEngGZipFileDeserializer::FinalizeL( CEZZStream& aZStream )

        {

        TPtrC8 od = aZStream.OutputDescriptor();

        iCrc = crc32(iCrc,od.Ptr(),od.Size());

        iParser->ParseL( od );

        iParser->ParseEndL();

    	}