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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 SC_XISTREAM_HXX
#define SC_XISTREAM_HXX
#include <comphelper/docpasswordhelper.hxx>
#include <filter/msfilter/mscodec.hxx>
#include <boost/shared_ptr.hpp>
#include "xlstream.hxx"
#include "xlconst.hxx"
class XclImpRoot;
/* ============================================================================
Input stream class for Excel import
- CONTINUE record handling
- ByteString and UniString support
- Decryption
============================================================================ */
// ============================================================================
// Decryption
// ============================================================================
class XclImpDecrypter;
typedef boost::shared_ptr< XclImpDecrypter > XclImpDecrypterRef;
/** Base class for BIFF stream decryption. */
class XclImpDecrypter : public ::comphelper::IDocPasswordVerifier
{
public:
explicit XclImpDecrypter();
virtual ~XclImpDecrypter();
/** Returns the current error code of the decrypter. */
inline ErrCode GetError() const { return mnError; }
/** Returns true, if the decoder has been initialized correctly. */
inline bool IsValid() const { return mnError == ERRCODE_NONE; }
/** Creates a (ref-counted) copy of this decrypter object. */
XclImpDecrypterRef Clone() const;
/** 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 >& rEncryptionData );
/** Updates the decrypter on start of a new record or after seeking stream. */
void Update( SvStream& rStrm, sal_uInt16 nRecSize );
/** Reads and decrypts nBytes bytes and stores data into the existing(!) buffer pData.
@return Count of bytes really read. */
sal_uInt16 Read( SvStream& rStrm, void* pData, sal_uInt16 nBytes );
protected:
/** Protected copy c'tor for OnClone(). */
explicit XclImpDecrypter( const XclImpDecrypter& rSrc );
private:
/** Implementation of cloning this object. */
virtual XclImpDecrypter* OnClone() const = 0;
/** Derived classes implement password verification and initialization of
the decoder. */
virtual ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >
OnVerifyPassword( const ::rtl::OUString& rPassword ) = 0;
virtual bool OnVerifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& rEncryptionData ) = 0;
/** Implementation of updating the decrypter. */
virtual void OnUpdate( sal_Size nOldStrmPos, sal_Size nNewStrmPos, sal_uInt16 nRecSize ) = 0;
/** Implementation of the decryption. */
virtual sal_uInt16 OnRead( SvStream& rStrm, sal_uInt8* pnData, sal_uInt16 nBytes ) = 0;
private:
ErrCode mnError; /// Decrypter error code.
sal_Size mnOldPos; /// Last known stream position.
sal_uInt16 mnRecSize; /// Current record size.
};
// ----------------------------------------------------------------------------
/** Decrypts BIFF5 stream contents. */
class XclImpBiff5Decrypter : public XclImpDecrypter
{
public:
explicit XclImpBiff5Decrypter( sal_uInt16 nKey, sal_uInt16 nHash );
private:
/** Private copy c'tor for OnClone(). */
explicit XclImpBiff5Decrypter( const XclImpBiff5Decrypter& rSrc );
/** Implementation of cloning this object. */
virtual XclImpBiff5Decrypter* OnClone() const;
/** Implements password verification and initialization of the decoder. */
virtual ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >
OnVerifyPassword( const ::rtl::OUString& rPassword );
virtual bool OnVerifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& rEncryptionData );
/** Implementation of updating the decrypter. */
virtual void OnUpdate( sal_Size nOldStrmPos, sal_Size nNewStrmPos, sal_uInt16 nRecSize );
/** Implementation of the decryption. */
virtual sal_uInt16 OnRead( SvStream& rStrm, sal_uInt8* pnData, sal_uInt16 nBytes );
private:
::msfilter::MSCodec_XorXLS95 maCodec; /// Crypto algorithm implementation.
::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > maEncryptionData;
sal_uInt16 mnKey;
sal_uInt16 mnHash;
};
// ----------------------------------------------------------------------------
/** Decrypts BIFF8 stream contents using the given document identifier. */
class XclImpBiff8Decrypter : public XclImpDecrypter
{
public:
explicit XclImpBiff8Decrypter( sal_uInt8 pnSalt[ 16 ],
sal_uInt8 pnVerifier[ 16 ], sal_uInt8 pnVerifierHash[ 16 ] );
private:
/** Private copy c'tor for OnClone(). */
explicit XclImpBiff8Decrypter( const XclImpBiff8Decrypter& rSrc );
/** Implementation of cloning this object. */
virtual XclImpBiff8Decrypter* OnClone() const;
/** Implements password verification and initialization of the decoder. */
virtual ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >
OnVerifyPassword( const ::rtl::OUString& rPassword );
virtual bool OnVerifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& rEncryptionData );
/** Implementation of updating the decrypter. */
virtual void OnUpdate( sal_Size nOldStrmPos, sal_Size nNewStrmPos, sal_uInt16 nRecSize );
/** Implementation of the decryption. */
virtual sal_uInt16 OnRead( SvStream& rStrm, sal_uInt8* pnData, sal_uInt16 nBytes );
/** Returns the block number corresponding to the passed stream position. */
sal_uInt32 GetBlock( sal_Size nStrmPos ) const;
/** Returns the block offset corresponding to the passed stream position. */
sal_uInt16 GetOffset( sal_Size nStrmPos ) const;
private:
::msfilter::MSCodec_Std97 maCodec; /// Crypto 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;
};
// ============================================================================
// Stream
// ============================================================================
/** This class represents an Excel stream position.
@descr It contains the relevant data for a stream position inside of a record
(including CONTINUE records). */
class XclImpStreamPos
{
public:
/** Constructs an invalid stream position data object. */
explicit XclImpStreamPos();
/** Sets the stream position data to the passed values. */
void Set( const SvStream& rStrm, sal_Size nNextPos, sal_Size nCurrSize,
sal_uInt16 nRawRecId, sal_uInt16 nRawRecSize, sal_uInt16 nRawRecLeft,
bool bValid );
/** Writes the contained stream position data to the given variables. */
void Get( SvStream& rStrm, sal_Size& rnNextPos, sal_Size& rnCurrSize,
sal_uInt16& rnRawRecId, sal_uInt16& rnRawRecSize, sal_uInt16& rnRawRecLeft,
bool& rbValid ) const;
private:
sal_Size mnPos; /// Absolute position of the stream.
sal_Size mnNextPos; /// Absolute position of next record.
sal_Size mnCurrSize; /// Current calculated size of the record.
sal_uInt16 mnRawRecId; /// Current raw record ID (including CONTINUEs).
sal_uInt16 mnRawRecSize; /// Current raw record size (without following CONTINUEs).
sal_uInt16 mnRawRecLeft; /// Bytes left in current raw record (without following CONTINUEs).
bool mbValid; /// Read state: false = record overread.
};
// ============================================================================
/** This class is used to import record oriented streams.
@descr An instance is constructed with an SvStream. The SvStream stream is
reset to its start while constructing this stream.
To start reading a record call StartNextRecord(). Now it is possible to
read all contents of the record using operator>>() or any of the Read***()
functions. If some data exceeds the record size limit, the stream looks for
a following CONTINUE record and jumps automatically to it. It is NOT
allowed that an atomic data type is split into two records (i.e. 4 bytes of
a double in one record and the other 4 bytes in a following CONTINUE).
Trying to read over the record limits results in a stream error. The
IsValid() function indicates that with returning false. From now on it is
undefined what data the read functions will return. The error state will be
reset, if the record is reset (with the method ResetRecord()) or if the
next record is started.
To switch off the automatic lookup of CONTINUE records, use ResetRecord()
with false parameter. This is useful i.e. on import of Escher objects,
where sometimes solely CONTINUE records will occur. The automatic lookup
keeps switched off until the method ResetRecord() is called with parameter
true. All other settings done on the stream (i.e. alternative CONTINUE
record identifier, enabled decryption, NUL substitution character) will be
reset to default values, if a new record is started.
The import stream supports decrypting the stream data. The contents of a
record (not the record header) will be encrypted by Excel if the file has
been stored with password protection. The functions SetDecrypter(),
EnableDecryption(), and DisableDecryption() control the usage of the
decryption algorithms. SetDecrypter() sets a new decryption algorithm and
initially enables it. DisableDecryption() may be used to stop the usage of
the decryption temporarily (sometimes record contents are never encrypted,
i.e. all BOF records or the stream position in BOUNDSHEET). Decryption will
be reenabled automatically, if a new record is started with the function
StartNextRecord().
It is possible to store several stream positions inside a record (including
its CONTINUE records). The positions are stored on a stack, which can be
controlled with the functions PushPosition(), PopPosition() and
RejectPosition(). The stack will be cleared whenever a new record is
started with the function StartNextRecord().
Additionally a single global stream position can be stored which keeps
valid during the whole import process (methods StoreGlobalPosition(),
SeekGlobalPosition() and DeleteGlobalPosition()). This is the only way to
jump back to a previous record (that is a real jump without return).
*/
class XclImpStream
{
public:
/** Detects the BIFF version of the passed workbook stream. */
static XclBiff DetectBiffVersion( SvStream& rStrm );
/** Constructs the Excel record import stream using a TOOLS stream object.
@param rInStrm The system input stream. Will be set to its start position.
Must exist as long as this object exists.
@param bContLookup Automatic CONTINUE lookup on/off. */
explicit XclImpStream(
SvStream& rInStrm,
const XclImpRoot& rRoot,
bool bContLookup = true );
~XclImpStream();
/** Returns the filter root data. */
inline const XclImpRoot& GetRoot() const { return mrRoot; }
/** Sets stream pointer to the start of the next record content.
@descr Ignores all CONTINUE records of the current record, if automatic
CONTINUE usage is switched on.
@return false = no record found (end of stream). */
bool StartNextRecord();
/** Sets stream pointer to the start of the record content for the record
at the passed absolute stream position.
@return false = no record found (end of stream). */
bool StartNextRecord( sal_Size nNextRecPos );
/** Sets stream pointer to begin of record content.
@param bContLookup Automatic CONTINUE lookup on/off. In difference
to other stream settings, this setting is persistent until next call of
this function (because it is wanted to receive the next CONTINUE
records separately).
@param nAltContId Sets an alternative record ID for content
continuation. This value is reset automatically when a new record is
started with StartNextRecord(). */
void ResetRecord( bool bContLookup,
sal_uInt16 nAltContId = EXC_ID_UNKNOWN );
/** Enables decryption of record contents for the rest of the stream. */
void SetDecrypter( XclImpDecrypterRef xDecrypter );
/** Sets decrypter from another stream. */
void CopyDecrypterFrom( const XclImpStream& rStrm );
/** Returns true, if a valid decrypter is set at the stream. */
bool HasValidDecrypter() const;
/** Switches usage of current decryption algorithm on/off.
@descr Encryption is re-enabled automatically, if a new record is
started using the function StartNextRecord(). */
void EnableDecryption( bool bEnable = true );
/** Switches usage of current decryption algorithm off.
@descr This is a record-local setting. The function StartNextRecord()
always enables decryption. */
inline void DisableDecryption() { EnableDecryption( false ); }
/** Pushes current position on user position stack.
@descr This stack is emptied when starting a new record with
StartNextRecord(). The decryption state (enabled/disabled) is not
pushed onto the stack. */
void PushPosition();
/** Seeks to last position from user position stack.
@descr This position will be removed from the stack. */
void PopPosition();
/** Stores current position. This position keeps valid in all records. */
void StoreGlobalPosition();
/** Seeks to the stored global user position. */
void SeekGlobalPosition();
/** Invalidates global user position. */
inline void DeleteGlobalPosition() { mbHasGlobPos = false; }
/** Returns record reading state: false = record overread. */
inline bool IsValid() const { return mbValid; }
/** Returns the current record ID. */
inline sal_uInt16 GetRecId() const { return mnRecId; }
/** Returns the position inside of the whole record content. */
sal_Size GetRecPos() const;
/** Returns the data size of the whole record without record headers. */
sal_Size GetRecSize();
/** Returns remaining data size of the whole record without record headers. */
sal_Size GetRecLeft();
/** Returns the record ID of the following record. */
sal_uInt16 GetNextRecId();
XclImpStream& operator>>( sal_Int8& rnValue );
XclImpStream& operator>>( sal_uInt8& rnValue );
XclImpStream& operator>>( sal_Int16& rnValue );
XclImpStream& operator>>( sal_uInt16& rnValue );
XclImpStream& operator>>( sal_Int32& rnValue );
XclImpStream& operator>>( sal_uInt32& rnValue );
XclImpStream& operator>>( float& rfValue );
XclImpStream& operator>>( double& rfValue );
sal_uInt8 ReaduInt8();
sal_Int16 ReadInt16();
sal_uInt16 ReaduInt16();
sal_Int32 ReadInt32();
sal_uInt32 ReaduInt32();
double ReadDouble();
/** Reads nBytes bytes to the existing(!) buffer pData.
@return Count of bytes really read. */
sal_Size Read( void* pData, sal_Size nBytes );
/** Copies nBytes bytes to rOutStrm.
@return Count of bytes really written. */
sal_Size CopyToStream( SvStream& rOutStrm, sal_Size nBytes );
/** Copies the entire record to rOutStrm. The current record position keeps unchanged.
@return Count of bytes really written. */
sal_Size CopyRecordToStream( SvStream& rOutStrm );
/** Seeks absolute in record content to the specified position.
@descr The value 0 means start of record, independent from physical stream position. */
void Seek( sal_Size nPos );
/** Seeks forward inside the current record. */
void Ignore( sal_Size nBytes );
// *** special string functions *** ---------------------------------------
// *** read/ignore unicode strings *** ------------------------------------
/* - look for CONTINUE records even if CONTINUE handling disabled
(only if inside of a CONTINUE record - for TXO import)
- no overread assertions (for Applix wrong string length export bug)
structure of an Excel unicode string:
(1) 2 byte character count
(2) 1 byte flags (16-bit-characters, rich string, far east string)
(3) [2 byte rich string format run count]
(4) [4 byte far east data size]
(5) character array
(6) [4 * (rich string format run count) byte]
(7) [(far east data size) byte]
header = (1), (2)
ext. header = (3), (4)
ext. data = (6), (7)
*/
/** Reads ext. header, detects 8/16 bit mode, sets all ext. info.
@return Total size of ext. data. */
sal_Size ReadUniStringExtHeader(
bool& rb16Bit, bool& rbRich, bool& rbFareast,
sal_uInt16& rnFormatRuns, sal_uInt32& rnExtInf, sal_uInt8 nFlags );
/** Seeks to begin of character array, detects 8/16 bit mode.
@return Total size of ext. data. */
sal_Size ReadUniStringExtHeader( bool& rb16Bit, sal_uInt8 nFlags );
/** Sets a replacement character for NUL characters.
@descr NUL characters must be replaced, because Tools strings cannot
handle them. The substitution character is reset to '?' automatically,
if a new record is started using the function StartNextRecord().
@param cNulSubst The character to use for NUL replacement. It is
possible to specify NUL here. in this case strings are terminated when
the first NUL occurs during string import. */
inline void SetNulSubstChar( sal_Unicode cNulSubst = '?' ) { mcNulSubst = cNulSubst; }
/** Reads nChars characters and returns the string. */
String ReadRawUniString( sal_uInt16 nChars, bool b16Bit );
/** Reads ext. header, nChar characters, ext. data and returns the string. */
String ReadUniString( sal_uInt16 nChars, sal_uInt8 nFlags );
/** Reads 8 bit flags, ext. header, nChar characters, ext. data and returns the string. */
String ReadUniString( sal_uInt16 nChars );
/** Reads 16 bit character count, 8 bit flags, ext. header, character array,
ext. data and returns the string. */
String ReadUniString();
/** Ignores nChars characters. */
void IgnoreRawUniString( sal_uInt16 nChars, bool b16Bit );
/** Ignores ext. header, nChar characters, ext. data. */
void IgnoreUniString( sal_uInt16 nChars, sal_uInt8 nFlags );
/** Ignores 8 bit flags, ext. header, nChar characters, ext. data. */
void IgnoreUniString( sal_uInt16 nChars );
// *** read/ignore 8-bit-strings, store in String *** ---------------------
/** Reads nChar byte characters and returns the string. */
String ReadRawByteString( sal_uInt16 nChars );
/** Reads 8/16 bit string length, character array and returns the string. */
String ReadByteString( bool b16BitLen );
// *** SvStream functions *** ---------------------------------------------
/** Returns the absolute stream position. */
inline sal_Size GetSvStreamPos() const { return mrStrm.Tell(); }
/** Returns the stream size. */
inline sal_Size GetSvStreamSize() const { return mnStreamSize; }
private:
/** Stores current stream position into rPos. */
void StorePosition( XclImpStreamPos& rPos );
/** Restores stream position contained in rPos. */
void RestorePosition( const XclImpStreamPos& rPos );
/** Seeks to next raw record header and reads record ID and size.
@descr This is a "raw" function, means that stream members are
inconsistent after return. Does only change mnRawRecId, mnRawRecSize,
and the base stream position, but no other members.
@return false = No record header found (end of stream). */
bool ReadNextRawRecHeader();
/** Initializes the decrypter to read a new record. */
void SetupDecrypter();
/** Initializes all members after base stream has been seeked to new raw record. */
void SetupRawRecord();
/** Initializes all members after base stream has been seeked to new record. */
void SetupRecord();
/** Returns true, if the passed ID is real or alternative continuation record ID. */
bool IsContinueId( sal_uInt16 nRecId ) const;
/** Goes to start of the next CONTINUE record.
@descr Stream must be located at the end of a raw record, and handling
of CONTINUE records must be enabled.
@return Copy of mbValid. */
bool JumpToNextContinue();
/** Goes to start of the next CONTINUE record while reading strings.
@descr Stream must be located at the end of a raw record. If reading
has been started in a CONTINUE record, jumps to an existing following
CONTINUE record, even if handling of CONTINUE records is disabled (This
is a special handling for TXO string data). Reads additional Unicode
flag byte at start of the new raw record and sets or resets rb16Bit.
@return Copy of mbValid. */
bool JumpToNextStringContinue( bool& rb16Bit );
/** Ensures that reading nBytes bytes is possible with next stream access.
@descr Stream must be located at the end of a raw record, and handling
of CONTINUE records must be enabled.
@return Copy of mbValid. */
bool EnsureRawReadSize( sal_uInt16 nBytes );
/** Returns the maximum size of raw data possible to read in one block. */
sal_uInt16 GetMaxRawReadSize( sal_Size nBytes ) const;
/** Reads and decrypts nBytes bytes to the existing(!) buffer pData.
@return Count of bytes really read. */
sal_uInt16 ReadRawData( void* pData, sal_uInt16 nBytes );
/** Reads 8 bit/16 bit string length. */
inline sal_uInt16 ReadByteStrLen( bool b16BitLen )
{ return b16BitLen ? ReaduInt16() : ReaduInt8(); }
private:
typedef ::std::vector< XclImpStreamPos > XclImpStreamPosStack;
SvStream& mrStrm; /// Reference to the system input stream.
const XclImpRoot& mrRoot; /// Filter root data.
XclImpDecrypterRef mxDecrypter; /// Provides methods to decrypt data.
XclImpStreamPos maFirstRec; /// Start position of current record.
XclImpStreamPosStack maPosStack; /// Stack for record positions.
XclImpStreamPos maGlobPos; /// User defined position elsewhere in stream.
sal_uInt16 mnGlobRecId; /// Record ID for user defined position.
bool mbGlobValidRec; /// Was user position a valid record?
bool mbHasGlobPos; /// Is user position defined?
sal_Size mnStreamSize; /// Size of system stream.
sal_Size mnNextRecPos; /// Start of next record header.
sal_Size mnCurrRecSize; /// Helper for record position.
sal_Size mnComplRecSize; /// Size of complete record data (with CONTINUEs).
bool mbHasComplRec; /// true = mnComplRecSize is valid.
sal_uInt16 mnRecId; /// Current record ID (not the CONTINUE ID).
sal_uInt16 mnAltContId; /// Alternative record ID for content continuation.
sal_uInt16 mnRawRecId; /// Current raw record ID (including CONTINUEs).
sal_uInt16 mnRawRecSize; /// Current raw record size (without following CONTINUEs).
sal_uInt16 mnRawRecLeft; /// Bytes left in current raw record (without following CONTINUEs).
sal_Unicode mcNulSubst; /// Replacement for NUL characters.
bool mbCont; /// Automatic CONTINUE lookup on/off.
bool mbUseDecr; /// Usage of decryption.
bool mbValidRec; /// false = No more records to read.
bool mbValid; /// false = Record overread.
};
// ============================================================================
#endif
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