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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: biffcodec.cxx,v $
*
* $Revision: 1.2 $
*
* last change: $Author: rt $ $Date: 2008-01-17 08:06:07 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
#include "oox/xls/biffcodec.hxx"
#include <osl/thread.h>
using ::rtl::OString;
using ::rtl::OUString;
using ::rtl::OStringToOUString;
namespace oox {
namespace xls {
// ============================================================================
const OString& BiffCodecHelper::getBiff5WbProtPassword()
{
static const OString saPass( "VelvetSweatshop" );
return saPass;
}
const OUString& BiffCodecHelper::getBiff8WbProtPassword()
{
static const OUString saPass = OStringToOUString( getBiff5WbProtPassword(), RTL_TEXTENCODING_ASCII_US );
return saPass;
}
// ============================================================================
BiffDecoderBase::BiffDecoderBase( const WorkbookHelper& rHelper ) :
WorkbookHelper( rHelper ),
mnError( CODEC_ERROR_UNSUPP_CRYPT )
{
}
BiffDecoderBase::~BiffDecoderBase()
{
}
void BiffDecoderBase::decode( sal_uInt8* pnDestData, const sal_uInt8* pnSrcData, sal_Int64 nStreamPos, sal_uInt16 nBytes )
{
if( pnDestData && pnSrcData && (nBytes > 0) )
{
if( isValid() )
implDecode( pnDestData, pnSrcData, nStreamPos, nBytes );
else
memcpy( pnDestData, pnSrcData, nBytes );
}
}
void BiffDecoderBase::setHasValidPassword( bool bValid )
{
mnError = bValid ? CODEC_OK : CODEC_ERROR_WRONG_PASS;
}
// ============================================================================
BiffDecoder_XOR::BiffDecoder_XOR( const WorkbookHelper& rHelper, sal_uInt16 nKey, sal_uInt16 nHash ) :
BiffDecoderBase( rHelper ),
maCodec( ::oox::core::BinaryCodec_XOR::CODEC_EXCEL )
{
init( BiffCodecHelper::getBiff5WbProtPassword(), nKey, nHash );
if( !isValid() )
{
OString aPass = OUStringToOString( queryPassword(), osl_getThreadTextEncoding() );
init( aPass, nKey, nHash );
}
}
void BiffDecoder_XOR::init( const OString& rPass, sal_uInt16 nKey, sal_uInt16 nHash )
{
sal_Int32 nLen = rPass.getLength();
bool bValid = (0 < nLen) && (nLen < 16);
if( bValid )
{
// copy byte string to sal_uInt8 array
sal_uInt8 pnPassw[ 16 ];
memset( pnPassw, 0, sizeof( pnPassw ) );
memcpy( pnPassw, rPass.getStr(), static_cast< size_t >( nLen ) );
// init codec
maCodec.initKey( pnPassw );
bValid = maCodec.verifyKey( nKey, nHash );
}
setHasValidPassword( bValid );
}
void BiffDecoder_XOR::implDecode( sal_uInt8* pnDestData, const sal_uInt8* pnSrcData, sal_Int64 nStreamPos, sal_uInt16 nBytes )
{
maCodec.startBlock();
maCodec.skip( static_cast< sal_Int32 >( (nStreamPos + nBytes) & 0x0F ) );
maCodec.decode( pnDestData, pnSrcData, nBytes );
}
// ============================================================================
namespace {
/** Returns the block index of the passed stream position for RCF decryption. */
sal_Int32 lclGetRcfBlock( sal_Int64 nStreamPos )
{
return static_cast< sal_Int32 >( nStreamPos / BIFF_RCF_BLOCKSIZE );
}
/** Returns the offset of the passed stream position in a block for RCF decryption. */
sal_Int32 lclGetRcfOffset( sal_Int64 nStreamPos )
{
return static_cast< sal_Int32 >( nStreamPos % BIFF_RCF_BLOCKSIZE );
}
} // namespace
// ----------------------------------------------------------------------------
BiffDecoder_RCF::BiffDecoder_RCF( const WorkbookHelper& rHelper,
sal_uInt8 pnDocId[ 16 ], sal_uInt8 pnSaltData[ 16 ], sal_uInt8 pnSaltHash[ 16 ] ) :
BiffDecoderBase( rHelper )
{
init( BiffCodecHelper::getBiff8WbProtPassword(), pnDocId, pnSaltData, pnSaltHash );
if( !isValid() )
init( queryPassword(), pnDocId, pnSaltData, pnSaltHash );
}
void BiffDecoder_RCF::init( const OUString& rPass, sal_uInt8 pnDocId[ 16 ], sal_uInt8 pnSaltData[ 16 ], sal_uInt8 pnSaltHash[ 16 ] )
{
sal_Int32 nLen = rPass.getLength();
bool bValid = (0 < nLen) && (nLen < 16);
if( bValid )
{
// copy string to sal_uInt16 array
sal_uInt16 pnPassw[ 16 ];
memset( pnPassw, 0, sizeof( pnPassw ) );
const sal_Unicode* pcChar = rPass.getStr();
const sal_Unicode* pcCharEnd = pcChar + nLen;
sal_uInt16* pnCurrPass = pnPassw;
for( ; pcChar < pcCharEnd; ++pcChar, ++pnCurrPass )
*pnCurrPass = static_cast< sal_uInt16 >( *pcChar );
// init codec
maCodec.initKey( pnPassw, pnDocId );
bValid = maCodec.verifyKey( pnSaltData, pnSaltHash );
}
setHasValidPassword( bValid );
}
void BiffDecoder_RCF::implDecode( sal_uInt8* pnDestData, const sal_uInt8* pnSrcData, sal_Int64 nStreamPos, sal_uInt16 nBytes )
{
sal_uInt8* pnCurrDest = pnDestData;
const sal_uInt8* pnCurrSrc = pnSrcData;
sal_Int64 nCurrPos = nStreamPos;
sal_uInt16 nBytesLeft = nBytes;
while( nBytesLeft > 0 )
{
// initialize codec for current stream position
maCodec.startBlock( lclGetRcfBlock( nCurrPos ) );
maCodec.skip( lclGetRcfOffset( nCurrPos ) );
// decode the block
sal_uInt16 nBlockLeft = static_cast< sal_uInt16 >( BIFF_RCF_BLOCKSIZE - lclGetRcfOffset( nCurrPos ) );
sal_uInt16 nDecBytes = ::std::min( nBytesLeft, nBlockLeft );
maCodec.decode( pnCurrDest, pnCurrSrc, static_cast< sal_Int32 >( nDecBytes ) );
// prepare for next block
pnCurrDest += nDecBytes;
pnCurrSrc += nDecBytes;
nCurrPos += nDecBytes;
nBytesLeft = nBytesLeft - nDecBytes;
}
}
// ============================================================================
} // namespace xls
} // namespace oox
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