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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
#include "biffcodec.hxx"
#include <osl/thread.h>
#include <string.h>
#include <oox/core/filterbase.hxx>
#include "biffinputstream.hxx"
namespace oox {
namespace xls {
using namespace ::com::sun::star::beans;
using namespace ::com::sun::star::uno;
using ::oox::core::FilterBase;
BiffDecoderBase::BiffDecoderBase() :
mbValid( false )
{
}
BiffDecoderBase::~BiffDecoderBase()
{
}
::comphelper::DocPasswordVerifierResult BiffDecoderBase::verifyPassword( const OUString& rPassword, Sequence< NamedValue >& o_rEncryptionData )
{
o_rEncryptionData = implVerifyPassword( rPassword );
mbValid = o_rEncryptionData.hasElements();
return mbValid ? ::comphelper::DocPasswordVerifierResult_OK : ::comphelper::DocPasswordVerifierResult_WRONG_PASSWORD;
}
::comphelper::DocPasswordVerifierResult BiffDecoderBase::verifyEncryptionData( const Sequence< NamedValue >& rEncryptionData )
{
mbValid = implVerifyEncryptionData( rEncryptionData );
return mbValid ? ::comphelper::DocPasswordVerifierResult_OK : ::comphelper::DocPasswordVerifierResult_WRONG_PASSWORD;
}
void BiffDecoderBase::decode( sal_uInt8* pnDestData, const sal_uInt8* pnSrcData, sal_Int64 nStreamPos, sal_uInt16 nBytes )
{
if( pnDestData && pnSrcData && (nBytes > 0) )
{
if( mbValid )
implDecode( pnDestData, pnSrcData, nStreamPos, nBytes );
else
memcpy( pnDestData, pnSrcData, nBytes );
}
}
BiffDecoder_XOR::BiffDecoder_XOR( const BiffDecoder_XOR& rDecoder ) :
BiffDecoderBase(), // must be called to prevent compiler warning
maCodec( ::oox::core::BinaryCodec_XOR::CODEC_EXCEL ),
maEncryptionData( rDecoder.maEncryptionData ),
mnKey( rDecoder.mnKey ),
mnHash( rDecoder.mnHash )
{
if( isValid() )
maCodec.initCodec( maEncryptionData );
}
BiffDecoder_XOR* BiffDecoder_XOR::implClone()
{
return new BiffDecoder_XOR( *this );
}
Sequence< NamedValue > BiffDecoder_XOR::implVerifyPassword( const OUString& rPassword )
{
maEncryptionData.realloc( 0 );
/* Convert password to a byte string. TODO: this needs some finetuning
according to the spec... */
OString aBytePassword = OUStringToOString( rPassword, osl_getThreadTextEncoding() );
sal_Int32 nLen = aBytePassword.getLength();
if( (0 < nLen) && (nLen < 16) )
{
// init codec
maCodec.initKey( reinterpret_cast< const sal_uInt8* >( aBytePassword.getStr() ) );
if( maCodec.verifyKey( mnKey, mnHash ) )
maEncryptionData = maCodec.getEncryptionData();
}
return maEncryptionData;
}
bool BiffDecoder_XOR::implVerifyEncryptionData( const Sequence< NamedValue >& rEncryptionData )
{
maEncryptionData.realloc( 0 );
if( rEncryptionData.hasElements() )
{
// init codec
maCodec.initCodec( rEncryptionData );
if( maCodec.verifyKey( mnKey, mnHash ) )
maEncryptionData = rEncryptionData;
}
return maEncryptionData.hasElements();
}
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 BiffDecoder_RCF& rDecoder ) :
BiffDecoderBase(), // must be called to prevent compiler warning
maEncryptionData( rDecoder.maEncryptionData ),
maSalt( rDecoder.maSalt ),
maVerifier( rDecoder.maVerifier ),
maVerifierHash( rDecoder.maVerifierHash )
{
if( isValid() )
maCodec.initCodec( maEncryptionData );
}
BiffDecoder_RCF* BiffDecoder_RCF::implClone()
{
return new BiffDecoder_RCF( *this );
}
Sequence< NamedValue > BiffDecoder_RCF::implVerifyPassword( const OUString& rPassword )
{
maEncryptionData.realloc( 0 );
sal_Int32 nLen = rPassword.getLength();
if( (0 < nLen) && (nLen < 16) )
{
// copy string to sal_uInt16 array
::std::vector< sal_uInt16 > aPassVect( 16 );
const sal_Unicode* pcChar = rPassword.getStr();
const sal_Unicode* pcCharEnd = pcChar + nLen;
::std::vector< sal_uInt16 >::iterator aIt = aPassVect.begin();
for( ; pcChar < pcCharEnd; ++pcChar, ++aIt )
*aIt = static_cast< sal_uInt16 >( *pcChar );
// init codec
maCodec.initKey( &aPassVect.front(), &maSalt.front() );
if( maCodec.verifyKey( &maVerifier.front(), &maVerifierHash.front() ) )
maEncryptionData = maCodec.getEncryptionData();
}
return maEncryptionData;
}
bool BiffDecoder_RCF::implVerifyEncryptionData( const Sequence< NamedValue >& rEncryptionData )
{
maEncryptionData.realloc( 0 );
if( rEncryptionData.hasElements() )
{
// init codec
maCodec.initCodec( rEncryptionData );
if( maCodec.verifyKey( &maVerifier.front(), &maVerifierHash.front() ) )
maEncryptionData = rEncryptionData;
}
return maEncryptionData.hasElements();
}
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;
}
}
BiffCodecHelper::BiffCodecHelper( const WorkbookHelper& rHelper ) :
WorkbookHelper( rHelper )
{
}
void BiffCodecHelper::cloneDecoder( BiffInputStream& rStrm )
{
if( mxDecoder.get() )
rStrm.setDecoder( BiffDecoderRef( mxDecoder->clone() ) );
}
} // namespace xls
} // namespace oox
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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