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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef OOX_XLS_BIFFCODEC_HXX
#define OOX_XLS_BIFFCODEC_HXX
#include <vector>
#include <comphelper/docpasswordhelper.hxx>
#include "oox/core/binarycodec.hxx"
#include "oox/xls/workbookhelper.hxx"
namespace oox {
namespace xls {
// ============================================================================
const sal_Int64 BIFF_RCF_BLOCKSIZE = 1024;
// ============================================================================
/** Base class for BIFF stream decoders. */
class BiffDecoderBase : public ::comphelper::IDocPasswordVerifier
{
public:
explicit BiffDecoderBase();
virtual ~BiffDecoderBase();
/** Derived classes return a clone of the decoder for usage in new streams. */
inline BiffDecoderBase* clone() { return implClone(); }
/** Implementation of the ::comphelper::IDocPasswordVerifier interface. */
virtual ::comphelper::DocPasswordVerifierResult verifyPassword( const ::rtl::OUString& rPassword, ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& o_rEncryptionData );
virtual ::comphelper::DocPasswordVerifierResult verifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& o_rEncryptionData );
/** Returns true, if the decoder has been initialized correctly. */
inline bool isValid() const { return mbValid; }
/** Decodes nBytes bytes and writes encrypted data into the buffer pnDestData. */
void decode(
sal_uInt8* pnDestData,
const sal_uInt8* pnSrcData,
sal_Int64 nStreamPos,
sal_uInt16 nBytes );
private:
/** Derived classes return a clone of the decoder for usage in new streams. */
virtual BiffDecoderBase* implClone() = 0;
/** Derived classes implement password verification and initialization of
the decoder. */
virtual ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > implVerifyPassword( const ::rtl::OUString& rPassword ) = 0;
virtual bool implVerifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& rEncryptionData ) = 0;
/** Implementation of decryption of a memory block. */
virtual void implDecode(
sal_uInt8* pnDestData,
const sal_uInt8* pnSrcData,
sal_Int64 nStreamPos,
sal_uInt16 nBytes ) = 0;
private:
bool mbValid; /// True = decoder is correctly initialized.
};
typedef ::boost::shared_ptr< BiffDecoderBase > BiffDecoderRef;
// ============================================================================
/** Decodes BIFF stream contents that are encoded using the old XOR algorithm. */
class BiffDecoder_XOR : public BiffDecoderBase
{
public:
explicit BiffDecoder_XOR( sal_uInt16 nKey, sal_uInt16 nHash );
private:
/** Copy constructor for cloning. */
BiffDecoder_XOR( const BiffDecoder_XOR& rDecoder );
/** Returns a clone of the decoder for usage in new streams. */
virtual BiffDecoder_XOR* implClone();
/** Implements password verification and initialization of the decoder. */
virtual ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > implVerifyPassword( const ::rtl::OUString& rPassword );
virtual bool implVerifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& rEncryptionData );
/** Implementation of decryption of a memory block. */
virtual void implDecode(
sal_uInt8* pnDestData,
const sal_uInt8* pnSrcData,
sal_Int64 nStreamPos,
sal_uInt16 nBytes );
private:
::oox::core::BinaryCodec_XOR maCodec; /// Cipher algorithm implementation.
::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > maEncryptionData;
sal_uInt16 mnKey;
sal_uInt16 mnHash;
};
// ============================================================================
/** Decodes BIFF stream contents that are encoded using the RC4 algorithm. */
class BiffDecoder_RCF : public BiffDecoderBase
{
public:
explicit BiffDecoder_RCF(
sal_uInt8 pnSalt[ 16 ],
sal_uInt8 pnVerifier[ 16 ],
sal_uInt8 pnVerifierHash[ 16 ] );
private:
/** Copy constructor for cloning. */
BiffDecoder_RCF( const BiffDecoder_RCF& rDecoder );
/** Returns a clone of the decoder for usage in new streams. */
virtual BiffDecoder_RCF* implClone();
/** Implements password verification and initialization of the decoder. */
virtual ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > implVerifyPassword( const ::rtl::OUString& rPassword );
virtual bool implVerifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& rEncryptionData );
/** Implementation of decryption of a memory block. */
virtual void implDecode(
sal_uInt8* pnDestData,
const sal_uInt8* pnSrcData,
sal_Int64 nStreamPos,
sal_uInt16 nBytes );
private:
::oox::core::BinaryCodec_RCF maCodec; /// Cipher algorithm implementation.
::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > maEncryptionData;
::std::vector< sal_uInt8 > maSalt;
::std::vector< sal_uInt8 > maVerifier;
::std::vector< sal_uInt8 > maVerifierHash;
};
// ============================================================================
/** Helper for BIFF stream codecs. Holds the used codec object. */
class BiffCodecHelper : public WorkbookHelper
{
public:
explicit BiffCodecHelper( const WorkbookHelper& rHelper );
/** Implementation helper, reads the FILEPASS and returns a decoder object. */
static BiffDecoderRef implReadFilePass( BiffInputStream& rStrm, BiffType eBiff );
/** Imports the FILEPASS record, asks for a password and sets a decoder at the stream. */
bool importFilePass( BiffInputStream& rStrm );
/** Clones the contained decoder object if existing and sets it at the passed stream. */
void cloneDecoder( BiffInputStream& rStrm );
private:
BiffDecoderRef mxDecoder; /// The decoder for import filter.
};
// ============================================================================
} // namespace xls
} // namespace oox
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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