/**************************************************************
 * 
 * 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.
 * 
 *************************************************************/


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

#include <com/sun/star/packages/zip/ZipConstants.hpp>
#include <com/sun/star/io/XOutputStream.hpp>
#include <comphelper/storagehelper.hxx>

#include <osl/time.h>

#include <EncryptionData.hxx>
#include <PackageConstants.hxx>
#include <ZipEntry.hxx>
#include <ZipFile.hxx>
#include <ZipPackageStream.hxx>
#include <ZipOutputStream.hxx>

using namespace rtl;
using namespace com::sun::star;
using namespace com::sun::star::io;
using namespace com::sun::star::uno;
using namespace com::sun::star::packages;
using namespace com::sun::star::packages::zip;
using namespace com::sun::star::packages::zip::ZipConstants;

/** This class is used to write Zip files
 */
ZipOutputStream::ZipOutputStream( const uno::Reference< lang::XMultiServiceFactory >& xFactory,
                                  const uno::Reference < XOutputStream > &xOStream )
: m_xFactory( xFactory )
, xStream(xOStream)
, m_aDeflateBuffer(n_ConstBufferSize)
, aDeflater(DEFAULT_COMPRESSION, sal_True)
, aChucker(xOStream)
, pCurrentEntry(NULL)
, nMethod(DEFLATED)
, bFinished(sal_False)
, bEncryptCurrentEntry(sal_False)
, m_pCurrentStream(NULL)
{
}

ZipOutputStream::~ZipOutputStream( void )
{
	for (sal_Int32 i = 0, nEnd = aZipList.size(); i < nEnd; i++)
		delete aZipList[i];
}

void SAL_CALL ZipOutputStream::setMethod( sal_Int32 nNewMethod ) 
	throw(RuntimeException)
{
	nMethod = static_cast < sal_Int16 > (nNewMethod);
}
void SAL_CALL ZipOutputStream::setLevel( sal_Int32 nNewLevel ) 
	throw(RuntimeException)
{
	aDeflater.setLevel( nNewLevel);
}

void SAL_CALL ZipOutputStream::putNextEntry( ZipEntry& rEntry, 
                        ZipPackageStream* pStream,
						sal_Bool bEncrypt)
	throw(IOException, RuntimeException)
{
	if (pCurrentEntry != NULL)
		closeEntry();
	if (rEntry.nTime == -1)
		rEntry.nTime = getCurrentDosTime();
	if (rEntry.nMethod == -1)
		rEntry.nMethod = nMethod;
	rEntry.nVersion = 20;
	rEntry.nFlag = 1 << 11;
	if (rEntry.nSize == -1 || rEntry.nCompressedSize == -1 ||
		rEntry.nCrc == -1)
    {
        rEntry.nSize = rEntry.nCompressedSize = 0;
		rEntry.nFlag |= 8;
    }

	if (bEncrypt)
	{
		bEncryptCurrentEntry = sal_True;

        m_xCipherContext = ZipFile::StaticGetCipher( m_xFactory, pStream->GetEncryptionData(), true );
        m_xDigestContext = ZipFile::StaticGetDigestContextForChecksum( m_xFactory, pStream->GetEncryptionData() );
		mnDigested = 0;
		rEntry.nFlag |= 1 << 4;
		m_pCurrentStream = pStream;
	}
	sal_Int32 nLOCLength = writeLOC(rEntry);
	rEntry.nOffset = static_cast < sal_Int32 > (aChucker.GetPosition()) - nLOCLength;
	aZipList.push_back( &rEntry );
	pCurrentEntry = &rEntry;
}

void SAL_CALL ZipOutputStream::closeEntry(  ) 
	throw(IOException, RuntimeException)
{
	ZipEntry *pEntry = pCurrentEntry;
	if (pEntry)
	{
		switch (pEntry->nMethod)
		{
			case DEFLATED:
				aDeflater.finish();
				while (!aDeflater.finished())
					doDeflate();
				if ((pEntry->nFlag & 8) == 0)
				{
					if (pEntry->nSize != aDeflater.getTotalIn())
					{
						OSL_ENSURE(false,"Invalid entry size");
					}
					if (pEntry->nCompressedSize != aDeflater.getTotalOut())
					{
						//VOS_DEBUG_ONLY("Invalid entry compressed size");
						// Different compression strategies make the merit of this
						// test somewhat dubious
						pEntry->nCompressedSize = aDeflater.getTotalOut();
					}
					if (pEntry->nCrc != aCRC.getValue())
					{
						OSL_ENSURE(false,"Invalid entry CRC-32");
					}
				}
				else
				{
					if ( !bEncryptCurrentEntry )
                    {
                        pEntry->nSize = aDeflater.getTotalIn();
                        pEntry->nCompressedSize = aDeflater.getTotalOut();
                    }
					pEntry->nCrc = aCRC.getValue();
					writeEXT(*pEntry);
				}
				aDeflater.reset();
				aCRC.reset();
				break;
			case STORED:
				if (!((pEntry->nFlag & 8) == 0))
					OSL_ENSURE ( false, "Serious error, one of compressed size, size or CRC was -1 in a STORED stream");
				break;
			default:
				OSL_ENSURE(false,"Invalid compression method");
				break;
		}

		if (bEncryptCurrentEntry)
		{
			bEncryptCurrentEntry = sal_False;

            m_xCipherContext.clear();

            uno::Sequence< sal_Int8 > aDigestSeq;
            if ( m_xDigestContext.is() )
            {
                aDigestSeq = m_xDigestContext->finalizeDigestAndDispose();
                m_xDigestContext.clear();
            }

            if ( m_pCurrentStream )
                m_pCurrentStream->setDigest( aDigestSeq );
		}
		pCurrentEntry = NULL;
        m_pCurrentStream = NULL;
	}
}

void SAL_CALL ZipOutputStream::write( const Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength ) 
	throw(IOException, RuntimeException)
{
	switch (pCurrentEntry->nMethod)
	{
		case DEFLATED:
			if (!aDeflater.finished())
			{
				aDeflater.setInputSegment(rBuffer, nNewOffset, nNewLength);
 				while (!aDeflater.needsInput())
					doDeflate();
				if (!bEncryptCurrentEntry)
					aCRC.updateSegment(rBuffer, nNewOffset, nNewLength);
			}
			break;
		case STORED:
			{
				Sequence < sal_Int8 > aTmpBuffer ( rBuffer.getConstArray(), nNewLength );
				aChucker.WriteBytes( aTmpBuffer );
			}
			break;
	}
}

void SAL_CALL ZipOutputStream::rawWrite( Sequence< sal_Int8 >& rBuffer, sal_Int32 /*nNewOffset*/, sal_Int32 nNewLength ) 
	throw(IOException, RuntimeException)
{
	Sequence < sal_Int8 > aTmpBuffer ( rBuffer.getConstArray(), nNewLength );
	aChucker.WriteBytes( aTmpBuffer );
}

void SAL_CALL ZipOutputStream::rawCloseEntry(  ) 
	throw(IOException, RuntimeException)
{
	if ( pCurrentEntry->nMethod == DEFLATED && ( pCurrentEntry->nFlag & 8 ) )
		writeEXT(*pCurrentEntry);
	pCurrentEntry = NULL;
}

void SAL_CALL ZipOutputStream::finish(  ) 
	throw(IOException, RuntimeException)
{
	if (bFinished)
		return;

	if (pCurrentEntry != NULL)
		closeEntry();

	if (aZipList.size() < 1)
		OSL_ENSURE(false,"Zip file must have at least one entry!\n");

	sal_Int32 nOffset= static_cast < sal_Int32 > (aChucker.GetPosition());
	for (sal_Int32 i =0, nEnd = aZipList.size(); i < nEnd; i++)
		writeCEN( *aZipList[i] );
	writeEND( nOffset, static_cast < sal_Int32 > (aChucker.GetPosition()) - nOffset);
	bFinished = sal_True;
	xStream->flush();
}

void ZipOutputStream::doDeflate()
{
	sal_Int32 nLength = aDeflater.doDeflateSegment(m_aDeflateBuffer, 0, m_aDeflateBuffer.getLength());

    if ( nLength > 0 )
    {
        uno::Sequence< sal_Int8 > aTmpBuffer( m_aDeflateBuffer.getConstArray(), nLength );
        if ( bEncryptCurrentEntry && m_xDigestContext.is() && m_xCipherContext.is() )
        {
            // Need to update our digest before encryption...
            sal_Int32 nDiff = n_ConstDigestLength - mnDigested;
            if ( nDiff )
            {
                sal_Int32 nEat = ::std::min( nLength, nDiff ); 
                uno::Sequence< sal_Int8 > aTmpSeq( aTmpBuffer.getConstArray(), nEat );
                m_xDigestContext->updateDigest( aTmpSeq );
                mnDigested = mnDigested + static_cast< sal_Int16 >( nEat );
            }

            uno::Sequence< sal_Int8 > aEncryptionBuffer = m_xCipherContext->convertWithCipherContext( aTmpBuffer );

            aChucker.WriteBytes( aEncryptionBuffer );

            // the sizes as well as checksum for encrypted streams is calculated here
            pCurrentEntry->nCompressedSize += aEncryptionBuffer.getLength();
            pCurrentEntry->nSize = pCurrentEntry->nCompressedSize;
            aCRC.update( aEncryptionBuffer );
        }
        else
        {
            aChucker.WriteBytes ( aTmpBuffer );
        }
    }

    if ( aDeflater.finished() && bEncryptCurrentEntry && m_xDigestContext.is() && m_xCipherContext.is() )
    {
        uno::Sequence< sal_Int8 > aEncryptionBuffer = m_xCipherContext->finalizeCipherContextAndDispose();
        if ( aEncryptionBuffer.getLength() )
        {
            aChucker.WriteBytes( aEncryptionBuffer );

            // the sizes as well as checksum for encrypted streams is calculated hier
            pCurrentEntry->nCompressedSize += aEncryptionBuffer.getLength();
            pCurrentEntry->nSize = pCurrentEntry->nCompressedSize;
            aCRC.update( aEncryptionBuffer );
        }
    }
}

void ZipOutputStream::writeEND(sal_uInt32 nOffset, sal_uInt32 nLength)
	throw(IOException, RuntimeException)
{
	aChucker << ENDSIG;
	aChucker << static_cast < sal_Int16 > ( 0 );
	aChucker << static_cast < sal_Int16 > ( 0 );
	aChucker << static_cast < sal_Int16 > ( aZipList.size() );
	aChucker << static_cast < sal_Int16 > ( aZipList.size() );
	aChucker << nLength;
	aChucker << nOffset;
	aChucker << static_cast < sal_Int16 > ( 0 );
}
void ZipOutputStream::writeCEN( const ZipEntry &rEntry )
	throw(IOException, RuntimeException)
{
    if ( !::comphelper::OStorageHelper::IsValidZipEntryFileName( rEntry.sPath, sal_True ) )
        throw IOException( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "Unexpected character is used in file name." ) ), uno::Reference< XInterface >() );

    ::rtl::OString sUTF8Name = ::rtl::OUStringToOString( rEntry.sPath, RTL_TEXTENCODING_UTF8 );
	sal_Int16 nNameLength 		= static_cast < sal_Int16 > ( sUTF8Name.getLength() );

	aChucker << CENSIG;
	aChucker << rEntry.nVersion;
	aChucker << rEntry.nVersion;
	if (rEntry.nFlag & (1 << 4) )
	{
		// If it's an encrypted entry, we pretend its stored plain text
		ZipEntry *pEntry = const_cast < ZipEntry * > ( &rEntry );
		pEntry->nFlag &= ~(1 <<4 );
		aChucker << rEntry.nFlag;
		aChucker << static_cast < sal_Int16 > ( STORED );
	}
	else
	{
		aChucker << rEntry.nFlag;
		aChucker << rEntry.nMethod;
	}
	aChucker << static_cast < sal_uInt32> ( rEntry.nTime );
	aChucker << static_cast < sal_uInt32> ( rEntry.nCrc );
	aChucker << rEntry.nCompressedSize;
	aChucker << rEntry.nSize;
	aChucker << nNameLength;
	aChucker << static_cast < sal_Int16> (0);
	aChucker << static_cast < sal_Int16> (0);
	aChucker << static_cast < sal_Int16> (0);
	aChucker << static_cast < sal_Int16> (0);
	aChucker << static_cast < sal_Int32> (0);
	aChucker << rEntry.nOffset;

	Sequence < sal_Int8 > aSequence( (sal_Int8*)sUTF8Name.getStr(), sUTF8Name.getLength() );
	aChucker.WriteBytes( aSequence );
}
void ZipOutputStream::writeEXT( const ZipEntry &rEntry )
	throw(IOException, RuntimeException)
{
	aChucker << EXTSIG;
	aChucker << static_cast < sal_uInt32> ( rEntry.nCrc );
	aChucker << rEntry.nCompressedSize;
	aChucker << rEntry.nSize;
}

sal_Int32 ZipOutputStream::writeLOC( const ZipEntry &rEntry )
	throw(IOException, RuntimeException)
{
    if ( !::comphelper::OStorageHelper::IsValidZipEntryFileName( rEntry.sPath, sal_True ) )
        throw IOException( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "Unexpected character is used in file name." ) ), uno::Reference< XInterface >() );

    ::rtl::OString sUTF8Name = ::rtl::OUStringToOString( rEntry.sPath, RTL_TEXTENCODING_UTF8 );
	sal_Int16 nNameLength 		= static_cast < sal_Int16 > ( sUTF8Name.getLength() );

	aChucker << LOCSIG;
	aChucker << rEntry.nVersion;

	if (rEntry.nFlag & (1 << 4) )
	{
		// If it's an encrypted entry, we pretend its stored plain text
		sal_Int16 nTmpFlag = rEntry.nFlag;
		nTmpFlag &= ~(1 <<4 );
		aChucker << nTmpFlag;
		aChucker << static_cast < sal_Int16 > ( STORED );
	}
	else
	{
		aChucker << rEntry.nFlag;
		aChucker << rEntry.nMethod;
	}

	aChucker << static_cast < sal_uInt32 > (rEntry.nTime);
	if ((rEntry.nFlag & 8) == 8 )
	{
		aChucker << static_cast < sal_Int32 > (0);
		aChucker << static_cast < sal_Int32 > (0);
		aChucker << static_cast < sal_Int32 > (0);
	}
	else
	{
		aChucker << static_cast < sal_uInt32 > (rEntry.nCrc);
		aChucker << rEntry.nCompressedSize;
		aChucker << rEntry.nSize;
	}
	aChucker << nNameLength;
	aChucker << static_cast < sal_Int16 > (0);

	Sequence < sal_Int8 > aSequence( (sal_Int8*)sUTF8Name.getStr(), sUTF8Name.getLength() );
	aChucker.WriteBytes( aSequence );

	return LOCHDR + nNameLength;
}
sal_uInt32 ZipOutputStream::getCurrentDosTime( )
{
	oslDateTime aDateTime;
	TimeValue aTimeValue;
	osl_getSystemTime ( &aTimeValue );
	osl_getDateTimeFromTimeValue( &aTimeValue, &aDateTime);

	sal_uInt32 nYear = static_cast <sal_uInt32> (aDateTime.Year);

	if (nYear>1980)
		nYear-=1980;
	else if (nYear>80)
		nYear-=80;
	sal_uInt32 nResult = static_cast < sal_uInt32>( ( ( ( aDateTime.Day) + 
									      ( 32 * (aDateTime.Month)) +
									      ( 512 * nYear ) ) << 16) |
									    ( ( aDateTime.Seconds/2) +
									  	  ( 32 * aDateTime.Minutes) +
										  ( 2048 * static_cast <sal_uInt32 > (aDateTime.Hours) ) ) );
    return nResult;
}
/*

   This is actually never used, so I removed it, but thought that the 
   implementation details may be useful in the future...mtg 20010307

   I stopped using the time library and used the OSL version instead, but
   it might still be useful to have this code here..

void ZipOutputStream::dosDateToTMDate ( tm &rTime, sal_uInt32 nDosDate)
{
	sal_uInt32 nDate = static_cast < sal_uInt32 > (nDosDate >> 16);
	rTime.tm_mday = static_cast < sal_uInt32 > ( nDate & 0x1F);
	rTime.tm_mon  = static_cast < sal_uInt32 > ( ( ( (nDate) & 0x1E0)/0x20)-1);
	rTime.tm_year = static_cast < sal_uInt32 > ( ( (nDate & 0x0FE00)/0x0200)+1980);

	rTime.tm_hour = static_cast < sal_uInt32 > ( (nDosDate & 0xF800)/0x800);
	rTime.tm_min  = static_cast < sal_uInt32 > ( (nDosDate & 0x7E0)/0x20);
	rTime.tm_sec  = static_cast < sal_uInt32 > ( 2 * (nDosDate & 0x1F) );
}
*/