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Diffstat (limited to 'oox/source/xls/biffcodec.cxx')
| -rw-r--r-- | oox/source/xls/biffcodec.cxx | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/oox/source/xls/biffcodec.cxx b/oox/source/xls/biffcodec.cxx new file mode 100644 index 000000000000..0eb0db29aa91 --- /dev/null +++ b/oox/source/xls/biffcodec.cxx @@ -0,0 +1,211 @@ +/************************************************************************* + * + * 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 + |