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/*************************************************************************
*
* $RCSfile: xistream.hxx,v $
*
* $Revision: 1.2 $
*
* last change: $Author: hr $ $Date: 2003-03-26 18:05:12 $
*
* The Contents of this file are made available subject to the terms of
* either of the following licenses
*
* - GNU Lesser General Public License Version 2.1
* - Sun Industry Standards Source License Version 1.1
*
* Sun Microsystems Inc., October, 2000
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2000 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
*
*
* Sun Industry Standards Source License Version 1.1
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source License Version 1.1 (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.openoffice.org/license.html.
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
*
* Copyright: 2000 by Sun Microsystems, Inc.
*
* All Rights Reserved.
*
* Contributor(s): _______________________________________
*
*
************************************************************************/
// ============================================================================
#ifndef SC_XISTREAM_HXX
#define SC_XISTREAM_HXX
#ifndef SC_FTOOLS_HXX
#include "ftools.hxx"
#endif
#ifndef SC_XLCONST_HXX
#include "xlconst.hxx"
#endif
/* ============================================================================
Input stream class for Excel import
- CONTINUE record handling
- ByteString and UniString support
============================================================================ */
// Decryption =================================================================
#define SC_XCL_USEDECR 0
#if SC_XCL_USEDECR
/** Base class for BIFF stream decryption. */
class XclImpDecrypter : ScfNoCopy
{
public:
virtual ~XclImpDecrypter();
/** Returns true, if the decrypter has been constructed successfully (especially
with a valid password). */
virtual bool IsValid() const = 0;
/** Initializes the key array offset which is dependent from record size. */
virtual void SetOffset( sal_uInt16 nRecSize ) = 0;
/** Reads and decrypts nBytes bytes and stores data into the existing(!) buffer pData.
@return Count of bytes really read. */
virtual sal_uInt32 ReadDecrypt( SvStream& rStrm, void* pData, sal_uInt32 nBytes ) = 0;
/** Calculates the 16-bit hash value for the given password. */
static sal_uInt16 GetHash( const ByteString& rPass );
/** Calculates the BIFF2-BIFF7 decryption key for the given password. */
static sal_uInt16 GetKey( const ByteString& rPass );
};
// ----------------------------------------------------------------------------
/** Decrypts BIFF5 stream contents using the given password and key. */
class XclImpBiff5Decrypter : public XclImpDecrypter
{
private:
sal_uInt8 mpKey[ 16 ]; /// Decryption key.
sal_uInt32 mnOffset; /// Key/stream offset.
bool mbIsValid; /// true = Password is valid.
public:
/** Constructs the decrypter.
@param nKey Password key from FILEPASS record.
@param nHash Password hash value from FILEPASS record. */
explicit XclImpBiff5Decrypter( const String& rPass, sal_uInt16 nKey, sal_uInt16 nHash );
/** Returns true, if the decrypter has been constructed successfully (especially
with a valid password). */
virtual bool IsValid() const;
/** Initializes the key array offset dependent from record size. */
virtual void SetOffset( sal_uInt16 nRecSize );
/** Reads and decrypts nBytes bytes and stores data into the existing(!) buffer pData.
@return Count of bytes really read. */
virtual sal_uInt32 ReadDecrypt( SvStream& rStrm, void* pData, sal_uInt32 nBytes );
};
// ----------------------------------------------------------------------------
/** Decrypts BIFF8 stream contents using the given password and key. */
class XclImpBiff8Decrypter : public XclImpDecrypter
{
public:
explicit XclImpBiff8Decrypter( const String& rPass );
/** Returns true, if the decrypter has been constructed successfully (especially
with a valid password). */
virtual bool IsValid() const;
/** Initializes the key array offset dependent from record size. */
virtual void SetOffset( sal_uInt16 nRecSize );
/** Reads and decrypts nBytes bytes and stores data into the existing(!) buffer pData.
@return Count of bytes really read. */
virtual sal_uInt32 ReadDecrypt( SvStream& rStrm, void* pData, sal_uInt32 nBytes );
};
#endif
// ============================================================================
/** 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
{
private:
sal_uInt32 mnPos; /// Absolute position of the stream.
sal_uInt32 mnNextPos; /// Absolute position of next record.
sal_uInt32 mnCurrSize; /// Current calculated size of the record.
sal_uInt32 mnRecLeft; /// Size left in current record.
sal_uInt16 mnRecSize; /// Size of record (without CONTINUE).
public:
/** Constructs the stream position data with the passed values. */
explicit XclImpStreamPos(
sal_uInt32 nStrmPos, sal_uInt32 nNextPos,
sal_uInt32 nCurrSize, sal_uInt32 nRecLeft,
sal_uInt16 nRecSize );
/** Sets the stream position data to the passed values. */
void Set(
sal_uInt32 nStrmPos, sal_uInt32 nNextPos,
sal_uInt32 nCurrSize, sal_uInt32 nRecLeft,
sal_uInt16 nRecSize );
/** Writes the contained stream position data to the given variables. */
void Get(
sal_uInt32& rnStrmPos, sal_uInt32& rnNextPos,
sal_uInt32& rnCurrSize, sal_uInt32& rnRecLeft,
sal_uInt16& rnRecSize ) const;
};
// ----------------------------------------------------------------------------
class XclImpRoot;
/** 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***() methods.
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()
method indicates that with returning false. From now on it is undefined what data
the read methods will return. The error state will be reset, if the record is
reset (with the method InitializeRecord()) or if the next record is started.
To switch off the automatic lookup of CONTINUE records, use InitializeRecord()
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 InitializeRecord() is called with parameter true.
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 methods EnableDecryption() and UseDecryption() control
the usage of the decryption algorithms. EnableDecryption() sets a decryption
algorithm. UseDecryption() 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). If decryption has been enabled
with EnableDecryption(), the usage will be switched on automatically.
It is possible to store several stream positions inside of a record (including
its CONTINUE records). The positions are stored in a stack, which can be controlled
with the methods PushPosition(), PopPosition() and RejectPosition(). The stack
will be cleared whenever a new record is started (using the method
StartNextRecord()).
Additionally a single global stream position can be stored which keeps valid
during the whole import process (methods StoreGlobalPosition(), SeekGlobalPosition()
and DeleteGlobalPosition()). So it is possible to jump back to a previous record
(that is a real jump without return).
*/
class XclImpStream
{
private:
#if SC_XCL_USEDECR
typedef ::std::auto_ptr< XclImpDecrypter > XclImpDecrypterPtr;
#endif
typedef ScfDelStack< XclImpStreamPos > XclImpStreamPosStack;
private:
SvStream& mrStrm; /// Reference to the system input stream.
const XclImpRoot& mrRoot; /// Filter root data.
#if SC_XCL_USEDECR
XclImpDecrypterPtr mpDecrypter; /// Provides methods to decrypt data.
#endif
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_uInt32 mnStreamSize; /// Size of system stream.
sal_uInt32 mnNextRecPos; /// Start of next record header.
sal_uInt32 mnCurrRecSize; /// Helper for record position.
sal_uInt32 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 mnRecSize; /// Size of current record content (without CONTINUE).
sal_uInt32 mnRecLeft; /// Count of bytes left in current record.
bool mbCont; /// Automatic CONTINUE lookup on/off.
#if SC_XCL_USEDECR
bool mbUseDecr; /// Usage of decryption.
#endif
bool mbValidRec; /// Read state: false = no record available.
bool mbValid; /// Read state: false = record overread.
bool mbWarnings; /// Enable/disable assertions.
public:
/** Constructs the Excel record import stream.
@param rInStrm The system input stream. Will be set to its start position.
@param bContHandling Automatic CONTINUE lookup on/off. */
explicit XclImpStream(
SvStream& rInStrm,
const XclImpRoot& rRoot,
bool bContHandling = 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 begin of record content.
@param bContHandling Automatic CONTINUE lookup on/off.
This setting is persistent until next call of this function.
@param nAltContId Sets an alternative record ID for content continuation.
This value is reset automatically when a new record is started with
StartNextRecord(). */
void InitializeRecord( bool bContHandling, sal_uInt16 nAltContId = EXC_ID_UNKNOWN );
/** Controls the appearance of overread warnings.
@param bWarnMode false = no overread assertions. */
inline void SetWarningMode( bool bWarnMode ) { mbWarnings = bWarnMode; }
#if SC_XCL_USEDECR
/** Enables decryption of record contents for the rest of the stream.
@descr Stream takes ownership of the decrypter object. */
void EnableDecryption( XclImpDecrypter* pDecrypter );
/** Switches usage of current decryption algorithm on/off. */
void UseDecryption( bool bUse );
#endif
/** Pushes current position on user position stack.
@descr This stack is emptied at every start of a new record. */
void PushPosition();
/** Seeks to last position from user position stack.
@descr This position will be removed from the stack. */
void PopPosition();
/** Removes last position from user position stack, but does not seek to it. */
void RejectPosition();
/** 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 read 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. */
inline sal_uInt32 GetRecPos() const
{ return IsValid() ? mnCurrRecSize - mnRecLeft : 0; }
/** Returns the data size of the whole record without record headers. */
sal_uInt32 GetRecSize();
/** Returns remaining data size of the whole record without record headers. */
inline sal_uInt32 GetRecLeft()
{ return IsValid() ? GetRecSize() - GetRecPos() : 0; }
inline XclImpStream& operator>>( sal_Int8& rnValue );
inline XclImpStream& operator>>( sal_uInt8& rnValue );
inline XclImpStream& operator>>( sal_Int16& rnValue );
inline XclImpStream& operator>>( sal_uInt16& rnValue );
inline XclImpStream& operator>>( sal_Int32& rnValue );
inline XclImpStream& operator>>( sal_uInt32& rnValue );
inline XclImpStream& operator>>( float& rfValue );
inline XclImpStream& operator>>( double& rfValue );
sal_Int8 ReadInt8();
sal_uInt8 ReaduInt8();
sal_Int16 ReadInt16();
sal_uInt16 ReaduInt16();
sal_Int32 ReadInt32();
sal_uInt32 ReaduInt32();
float ReadFloat();
double ReadDouble();
/** Reads nBytes bytes to the existing(!) buffer pData.
@return Count of bytes really read. */
sal_uInt32 Read( void* pData, sal_uInt32 nBytes );
/** Copies nBytes bytes to rOutStrm.
@return Count of bytes really written. */
sal_uInt32 CopyToStream( SvStream& rOutStrm, sal_uInt32 nBytes );
/** Copies the entire record to rOutStrm. The current record position keeps unchanged.
@return Count of bytes really written. */
sal_uInt32 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_uInt32 nPos );
/** Seeks forward inside the current record. */
void Ignore( sal_uInt32 nBytes );
// *** UNICODE STRINGS ***
// 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)
// *** special string functions - use with care ***
/** Reads ext. header, detects 8/16 bit mode, sets all ext. info.
@return Size of ext. data. */
sal_uInt32 ReadUniStringExtHeader(
bool& rb16Bit, bool& rbRich, bool& rbFareast,
sal_uInt16& rnCrun, sal_uInt32& rnExtInf, sal_uInt8 nFlags );
/** Seeks to begin of character array, detects 8/16 bit mode.
@return Size of ext. data. */
sal_uInt32 ReadUniStringExtHeader( bool& rb16Bit, sal_uInt8 nFlags );
/** Skips ext. data after character array. */
inline void SkipUniStringExtData( sal_uInt32 nExtSize )
{ Ignore( nExtSize ); }
// *** 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)
/** Reads nChars characters and appends string to rString. */
void AppendRawUniString( String& rString, sal_uInt16 nChars, bool b16Bit );
/** Reads ext. header, nChar characters, ext. data and appends string to rString. */
void AppendUniString( String& rString, sal_uInt16 nChars, sal_uInt8 nFlags );
/** Reads 8 bit flags, ext. header, nChar characters, ext. data and appends string to rString. */
inline void AppendUniString( String& rString, sal_uInt16 nChars );
/** Reads 16 bit character count, 8 bit flags, ext. header, character array,
ext. data and appends string to rString. */
inline void AppendUniString( String& rString );
/** 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. */
inline void IgnoreUniString( sal_uInt16 nChars );
/** Ignores 16 bit character count, 8 bit flags, ext. header, character array, ext. data. */
inline void IgnoreUniString();
// *** read/ignore 8-bit-strings, store in String ***
/** Reads nChar byte characters and appends string to rString. */
inline void AppendRawByteString( String& rString, sal_uInt16 nChars );
/** Reads 8/16 bit string length, character array and appends string to rString. */
inline void AppendByteString( String& rString, bool b16BitLen );
/** 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 );
/** Ignores nChar byte characters. */
inline void IgnoreRawByteString( sal_uInt16 nChars );
/** Ignores 8/16 bit string length, character array. */
inline void IgnoreByteString( bool b16BitLen );
// *** SvStream functions ***
/** Returns the absolute stream position. */
sal_uInt32 Tell() const;
/** Returns the stream size. */
inline sal_uInt32 GetStreamSize() const { return mnStreamSize; }
private:
#if SC_XCL_USEDECR
/** Initializes the key/stream offset of the decrypter. */
inline void SetDecrypterOffset( sal_uInt16 nRecSize );
#endif
/** Reads and decrypts a sal_Int8 value. */
void ReadAtom( sal_Int8& rnValue );
/** Reads and decrypts a sal_uInt8 value. */
void ReadAtom( sal_uInt8& rnValue );
/** Reads and decrypts a sal_Int16 value. */
void ReadAtom( sal_Int16& rnValue );
/** Reads and decrypts a sal_uInt16 value. */
void ReadAtom( sal_uInt16& rnValue );
/** Reads and decrypts a sal_Int32 value. */
void ReadAtom( sal_Int32& rnValue );
/** Reads and decrypts a sal_uInt32 value. */
void ReadAtom( sal_uInt32& rnValue );
/** Reads and decrypts a float value. */
void ReadAtom( float& rfValue );
/** Reads and decrypts a double value. */
void ReadAtom( double& rfValue );
/** Reads and decrypts nBytes bytes to the existing(!) buffer pData.
@return Count of bytes really read. */
sal_uInt32 ReadData( void* pData, sal_uInt32 nBytes );
/** Internal start of a new record, doesn't change mnNextRecPos and mbValid.
@return false = no record found (end of stream). */
bool GetNextRecord( sal_uInt16& rnRecId, sal_uInt16& rnRecSize );
/** Internal setup of a new record, expecting mnRecId and mnNextRecPos. */
void SetupRecord();
/** Returns true, if the passed ID is a real or an alternative continuation record ID. */
bool IsContinueId( sal_uInt16 nRecId );
/** Looks for and goes to a following CONTINUE record.
@descr Does not change mbValid, updates mnCurrRecSize. */
bool GetContinue();
/** Checks mnRecLeft and jumps into next CONTINUE record if necessary and mbCont is true. */
bool CheckDataLeft( sal_uInt32 nBytes );
/** Goes to start of the next CONTINUE record.
@descr Sets mbValid, mnNextRecPos and mnRecLeft. */
void StartContinue();
/** Goes to start of the next CONTINUE record while reading strings.
@descr Sets mbValid, mnNextRecPos and mnRecLeft, reads additional Unicode
flag byte and sets/resets rb16Bit. */
void StartStringContinue( bool& rb16Bit );
/** Reads 8 bit/16 bit string length. */
inline sal_uInt16 ReadByteStrLen( bool b16BitLen )
{ return b16BitLen ? ReaduInt16() : ReaduInt8(); }
/** Restores stream position contained in rPos. */
void RestorePosition( const XclImpStreamPos& rPos );
};
// ----------------------------------------------------------------------------
inline XclImpStream& XclImpStream::operator>>( sal_Int8& rnValue )
{
if( CheckDataLeft( 1 ) ) ReadAtom( rnValue );
return *this;
}
inline XclImpStream& XclImpStream::operator>>( sal_uInt8& rnValue )
{
if( CheckDataLeft( 1 ) ) ReadAtom( rnValue );
return *this;
}
inline XclImpStream& XclImpStream::operator>>( sal_Int16& rnValue )
{
if( CheckDataLeft( 2 ) ) ReadAtom( rnValue );
return *this;
}
inline XclImpStream& XclImpStream::operator>>( sal_uInt16& rnValue )
{
if( CheckDataLeft( 2 ) ) ReadAtom( rnValue );
return *this;
}
inline XclImpStream& XclImpStream::operator>>( sal_Int32& rnValue )
{
if( CheckDataLeft( 4 ) ) ReadAtom( rnValue );
return *this;
}
inline XclImpStream& XclImpStream::operator>>( sal_uInt32& rnValue )
{
if( CheckDataLeft( 4 ) ) ReadAtom( rnValue );
return *this;
}
inline XclImpStream& XclImpStream::operator>>( float& rfValue )
{
if( CheckDataLeft( 4 ) ) ReadAtom( rfValue );
return *this;
}
inline XclImpStream& XclImpStream::operator>>( double& rfValue )
{
if( CheckDataLeft( 8 ) ) ReadAtom( rfValue );
return *this;
}
// ----------------------------------------------------------------------------
inline void XclImpStream::AppendUniString( String& rString, sal_uInt16 nChars )
{
AppendUniString( rString, nChars, ReaduInt8() );
}
inline void XclImpStream::AppendUniString( String& rString )
{
AppendUniString( rString, ReaduInt16() );
}
inline void XclImpStream::IgnoreUniString( sal_uInt16 nChars )
{
IgnoreUniString( nChars, ReaduInt8() );
}
inline void XclImpStream::IgnoreUniString()
{
IgnoreUniString( ReaduInt16() );
}
// ----------------------------------------------------------------------------
inline void XclImpStream::AppendRawByteString( String& rString, sal_uInt16 nChars )
{
AppendRawUniString( rString, nChars, false );
}
inline void XclImpStream::AppendByteString( String& rString, bool b16BitLen )
{
AppendRawByteString( rString, ReadByteStrLen( b16BitLen ) );
}
inline void XclImpStream::IgnoreRawByteString( sal_uInt16 nChars )
{
Ignore( nChars );
}
inline void XclImpStream::IgnoreByteString( bool b16BitLen )
{
IgnoreRawByteString( ReadByteStrLen( b16BitLen ) );
}
// ----------------------------------------------------------------------------
#if SC_XCL_USEDECR
inline void XclImpStream::SetDecrypterOffset( sal_uInt16 nRecSize )
{
if( mpDecrypter.get() )
mpDecrypter->SetOffset( nRecSize );
}
#endif
// ============================================================================
#endif
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