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 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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 *************************************************************/



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_extensions.hxx"

#include "xmxtrct.hxx"

#include <rtl/memory.h>
#include <tools/zcodec.hxx>
#include <unotools/streamhelper.hxx>
#include <sot/storage.hxx>

// ----------------
// - XMXLockBytes -
// ----------------

class XMXLockBytes : public SvLockBytes
{
	REF( NMSP_IO::XInputStream ) 	mxIStm;
	SEQ( sal_Int8 )					maSeq;

									XMXLockBytes();

public:

									XMXLockBytes( const REF( NMSP_IO::XInputStream )& rxIStm );
	virtual							~XMXLockBytes();

	virtual ErrCode					ReadAt( sal_Size nPos, void* pBuffer, sal_Size nCount, sal_Size* pRead ) const;
	virtual ErrCode					WriteAt( sal_Size nPos, const void* pBuffer, sal_Size nCount, sal_Size* pWritten );
	virtual ErrCode					Flush() const;
	virtual ErrCode					SetSize( sal_Size nSize );
	virtual ErrCode					Stat( SvLockBytesStat*, SvLockBytesStatFlag ) const;
};

// ------------------------------------------------------------------------

XMXLockBytes::XMXLockBytes( const REF( NMSP_IO::XInputStream )& rxIStm ) :
	mxIStm( rxIStm )
{
	if( mxIStm.is() )
	{
		const sal_uInt32	nBytesToRead = 65535;
		sal_uInt32			nRead;

		do
		{
			SEQ( sal_Int8 ) aReadSeq;

			nRead = mxIStm->readSomeBytes( aReadSeq, nBytesToRead );

			if( nRead )
			{
				const sal_uInt32 nOldLength = maSeq.getLength();
				maSeq.realloc( nOldLength + nRead );
				rtl_copyMemory( maSeq.getArray() + nOldLength, aReadSeq.getConstArray(), aReadSeq.getLength() );
			}
		}
		while( nBytesToRead == nRead );
	}
}

// ------------------------------------------------------------------------

XMXLockBytes::~XMXLockBytes()
{
}

// ------------------------------------------------------------------------

ErrCode XMXLockBytes::ReadAt( sal_Size nPos, void* pBuffer, sal_Size nCount, sal_Size* pRead ) const
{
	const sal_Size		nSeqLen = maSeq.getLength();
	ErrCode				nErr = ERRCODE_NONE;

	if( nPos < nSeqLen )
	{
		if( ( nPos + nCount ) > nSeqLen )
			nCount = nSeqLen - nPos;

		rtl_copyMemory( pBuffer, maSeq.getConstArray() + nPos, nCount );
		*pRead = nCount;
	}
	else
		*pRead = 0UL;

	return nErr;
}

// ------------------------------------------------------------------------

ErrCode XMXLockBytes::WriteAt( sal_Size /*nPos*/, const void* /*pBuffer*/, sal_Size /*nCount*/, sal_Size* /*pWritten*/ )
{
	return ERRCODE_IO_CANTWRITE;
}

// ------------------------------------------------------------------------

ErrCode XMXLockBytes::Flush() const
{
	return ERRCODE_NONE;
}

// ------------------------------------------------------------------------

ErrCode XMXLockBytes::SetSize( sal_Size /*nSize*/ )
{
	return ERRCODE_IO_CANTWRITE;
}

// ------------------------------------------------------------------------

ErrCode XMXLockBytes::Stat( SvLockBytesStat* pStat, SvLockBytesStatFlag /*eFlag*/ ) const
{
	pStat->nSize = maSeq.getLength();
	return ERRCODE_NONE;
}

// ----------------
// - XMLExtractor -
// ----------------

XMLExtractor::XMLExtractor( const REF( NMSP_LANG::XMultiServiceFactory )& rxMgr ) :
	mxFact( rxMgr )
{
}

// -----------------------------------------------------------------------------

XMLExtractor::~XMLExtractor()
{
}

// -----------------------------------------------------------------------------

REF( NMSP_IO::XInputStream ) SAL_CALL XMLExtractor::extract( const REF( NMSP_IO::XInputStream )& rxIStm ) throw( NMSP_UNO::RuntimeException )
{
	REF( NMSP_IO::XInputStream ) xRet;

	if( rxIStm.is() )
	{
		SvStream		aIStm( new XMXLockBytes( rxIStm ) );
		SvStorageRef	aStorage( new SvStorage( aIStm ) );
		String			aStmName;
		const String	aFormat1( String::CreateFromAscii( "XMLFormat" ) );
		const String	aFormat2( String::CreateFromAscii( "XMLFormat2" ) );

		if( aStorage->IsContained( aFormat2 ) )
			aStmName = aFormat2;
		else if( aStorage->IsContained( aFormat1 ) )
			aStmName = aFormat1;

		if( !aStorage->GetError() && aStmName.Len() && aStorage->IsStream( aStmName ) )
		{
            SvStorageStreamRef xStream( aStorage->OpenSotStream( aStmName ) );

			if( xStream.Is() )
			{
				SvMemoryStream*	pMemStm = new SvMemoryStream( 65535, 65535 );
				ZCodec			aCodec;

				aCodec.BeginCompression( ZCODEC_BEST_COMPRESSION );
				aCodec.Decompress( *xStream, *pMemStm );
				aCodec.EndCompression();

				xRet = new ::utl::OInputStreamHelper( new SvLockBytes( pMemStm, sal_True ), 65535 );
			}
		}
	}

	return xRet;
}