1 // Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 // GZIP output stream functions

    15 //

    16 

    17 #include "xmlenggzipfiledeserializer.h"

    18 #include <ezstream.h>

    19 #include <ezdecompressor.h>

    20 

    21 

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

    23 	    {

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

    25 	    CleanupStack::PushL( bm );

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

    27 	    return bm;	

    28 	    }

    29 

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

    31 	    {

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

    33 	    CleanupStack::Pop( bm );

    34 	    return bm;	

    35 	    }

    36 

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

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

    39         {

    40         iParser = aParser;

    41         }

    42 

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

    44         {

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

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

    47 	    EZGZipFile::ReadHeaderL(iInputFile,iHeader);

    48 	    iCrc = crc32(iCrc,NULL,0);

    49         

    50 	    if ( aBufSize <= 0 ) 

    51 	        {

    52 	        User::Leave(KErrArgument);

    53 	        }

    54 	    iInputBuffer = new (ELeave) TUint8[aBufSize];

    55 	    iOutputBuffer = new (ELeave) TUint8[aBufSize];

    56 

    57 	    iInputDescriptor.Set(iInputBuffer,0,aBufSize);

    58 	    iOutputDescriptor.Set(iOutputBuffer,0,aBufSize);

    59 	

    60 	    

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

    62         }

    63 

    64    CXmlEngGZipFileDeserializer::~CXmlEngGZipFileDeserializer()

    65         {

    66         //do NOT destroy iParser

    67         delete iDecompressor;

    68         delete[] iInputBuffer;

    69         delete[] iOutputBuffer;

    70         iInputFile.Close();

    71         }

    72  

    73    TBool CXmlEngGZipFileDeserializer::InflateL()

    74 	    {

    75 	    TBool keepGoing = iDecompressor->InflateL();

    76 

    77 	    if (!keepGoing)

    78 		    {

    79 		    if (iCrc != iTrailer.iCrc32)

    80 			    User::Leave(KEZlibErrBadGZipCrc);

    81 		    iInputFile.Close();

    82 		    }

    83 	    return keepGoing;

    84 	    }

    85     

    86     void CXmlEngGZipFileDeserializer::InitializeL( CEZZStream& aZStream )

    87     	{

    88     	iParser->ParseBeginL();

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

    90 	    aZStream.SetInput(iInputDescriptor);

    91     	aZStream.SetOutput( iOutputDescriptor );

    92     	}

    93 

    94     void CXmlEngGZipFileDeserializer::NeedInputL( CEZZStream& aZStream )

    95     	{

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

    97 	    aZStream.SetInput(iInputDescriptor);

    98     	}

    99 

   100     void CXmlEngGZipFileDeserializer::NeedOutputL( CEZZStream& aZStream )

   101     	{

   102     	TPtrC8 od = aZStream.OutputDescriptor();

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

   104     	iParser->ParseL( od );

   105     	aZStream.SetOutput( iOutputDescriptor );

   106     	}

   107 

   108     void CXmlEngGZipFileDeserializer::FinalizeL( CEZZStream& aZStream )

   109         {

   110         TPtrC8 od = aZStream.OutputDescriptor();

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

   112         iParser->ParseL( od );

   113         iParser->ParseEndL();

   114     	}