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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 .
*/
#ifndef INCLUDED_SVL_FILEREC_HXX
#define INCLUDED_SVL_FILEREC_HXX
#include <sal/config.h>
#include <sal/log.hxx>
#include <svl/svldllapi.h>
#include <tools/debug.hxx>
#include <tools/stream.hxx>
#include <osl/diagnose.h>
#include <vector>
#define SFX_REC_PRETAG_EXT sal_uInt8(0x00) // Pre-Tag for Extended-Records
#define SFX_REC_PRETAG_EOR sal_uInt8(0xFF) // Pre-Tag for End-Of-Records
#define SFX_REC_TYPE_SINGLE sal_uInt8(0x01) // Single-Content-Record
#define SFX_REC_TYPE_FIXSIZE sal_uInt8(0x02) // Fix-Size-Multi-Content-Record
#define SFX_REC_TYPE_VARSIZE_RELOC sal_uInt8(0x03) // variable Rec-Size
#define SFX_REC_TYPE_VARSIZE sal_uInt8(0x04) // old (not movable)
#define SFX_REC_TYPE_MIXTAGS_RELOC sal_uInt8(0x07) // Mixed Tag Content-Record
#define SFX_REC_TYPE_MIXTAGS sal_uInt8(0x08) // old (not movable)
#define SFX_REC_HEADERSIZE_MINI 4 // size of the Mini-Record-Header
#define SFX_REC_HEADERSIZE_SINGLE 4 // additional HEADERSIZE_MINI => 8
#define SFX_REC_HEADERSIZE_MULTI 6 // additional HEADERSIZE_SINGLE => 14
// General file format: documented at class SfxMiniRecordReader below
/** Writes simple records in a stream
*
* An instance of this class can write a simple record into a stream. It identifies itself
* with a sal_uInt8 and stores its own size. This allows it to be skipped with old versions or
* readers if they do not know the record type (= tag). No version number will be stored.
*
* One can either provide the size or the latter will be automatically calculated based on the
* difference of Tell() before and after streaming the content.
*
* @par File format
*
* 1* sal_uInt8 Content-Tag (!= 0)
* 1* 3-sal_uInt8 OffsetToEndOfRec in Bytes
* SizeOfContent* sal_uInt8 Content
*
* @par Example
* @code
* {
* SfxMiniRecordWriter aRecord( pStream, MY_TAG_X );
* *aRecord << aMember1;
* *aRecord << aMember2;
* }
* @endcode
*
* @note To ensure up- and downwards compatibility, new versions need to include
* the data of the older ones and are only allowed to add data afterwards.
* @see SfxMiniRecordReader
*/
class SVL_DLLPUBLIC SfxMiniRecordWriter
{
protected:
SvStream* _pStream; // <SvStream> with the record
sal_uInt32 _nStartPos; // starting position of the total record in the stream
bool _bHeaderOk; /* TRUE, if header already written */
sal_uInt8 _nPreTag; // 'pre-Tag' to write to header
public:
inline SfxMiniRecordWriter( SvStream *pStream, sal_uInt8 nTag );
inline ~SfxMiniRecordWriter();
sal_uInt32 Close( bool bSeekToEndOfRec = true );
private:
SfxMiniRecordWriter( const SfxMiniRecordWriter& ) = delete;
SfxMiniRecordWriter& operator=(const SfxMiniRecordWriter&) = delete;
};
/** Reads simple record from a stream
*
* An instance of this class allows to read a simple record from a stream that was written by
* SfxMiniRecordWriter. It is also possible to skip a record, even without knowing its internal
* format.
*
* @par Example
* @code
* {
* SfxMiniRecordReader aRecord( pStream );
* switch ( aRecord.GetTag() )
* {
* case MY_TAG_X:
* *aRecord >> aMember1;
* *aRecord >> aMember2;
* break;
*
* ...
* }
* }
* @endcode
*
* @par General file format
*
* Each record begins with one byte, the so called 'Pre-Tag'.
*
* If this 'Pre-Tag' == 0x00, then the record is a extended record,
* whose type is further determined by another byte at position 5:
*
* 0x01: SfxSingleRecord
* 0x02: SfxMultiFixRecord
* 0x03+0x04: SfxMultiVarRecord
* 0x07+0x08: SfxMultiMixRecord
* (All other possible record types are reserved.)
*
* Normally, if only for performance reasons, the file formats are
* constructed in such a way, that when loading the record type
* is predetermined. So the record type serves mainly for checks
* and for file viewers that do not know the exact file format.
*
* For that purpose 'SfxMiniRecordReader' provides a static method
* 'ScanRecordType()', with which it is possible to find out what
* Record type can be found in the stream that was passed.
*
* A 'Pre-Tag' with value 0xFF is reserved for a terminator.
* Terminators are used to stop looking for a particular record,
* i.e. if it was not found until then the search will not be continued.
*
* For all other values of the 'Pre-Tag' (so 0x01 to 0xFE) the record
* is one that is compatible with SW3, called 'SfxMiniRecord' here,
* and therefore it can be read with an <SfxMiniRecordReader>.
*
* If the record starts with 0x44 it could be a Drawing-Engine-Record.
* This is the case if the following 3 bytes spell 'RMD' or 'RVW'
* (which together with 'D'==0x44 form an abbreviation for 'DRaw-MoDel'
* or 'DRaw-VieW'). Records of this type cannot be read by the classes
* represented here, nor interpreted in any way. Only the
* 'ScanRecordType()' method can recognise it - but further processing
* is impossible.
*
* The 3 bytes in position 2 to 4 normally contain the size of the
* record without the pre-tag and the size field itself,
* so the remaining size after the 4 byte header.
*
* Structure of the Mini-Records:
*
* 1 sal_uInt8 Pre-Tag
* 3 sal_uInt8 OffsetToEndOfRec
* OffsetToEndOfRec* 1 sal_uInt8 Content
*
* For Extended-Records the 4 byte header is followed by an extended header,
* which contains first the record type, than a version number
* and a tag, which indicates the kind of content.
*
* Structure of the extended record:
*
* 1 sal_uInt8 Pre-Tag (==0x00)
* 3 sal_uInt8 OffsetToEndOfRec
* OffsetToEndOfRec* 1 sal_uInt8 Content
* 1 sal_uInt8 Record-Type
* 1 sal_uInt8 Version
* 2 sal_uInt8 Tag
* ContentSize* 1 sal_uInt8 Content
*
* (ContentSize = OffsetToEndOfRec - 8)
*
* @note
* The reason for the structure of the record is as follows:
*
* The SW record type came first, and so had to be kept 1:1.
* Fortunately some record tags had not been used (like 0x00 and 0xFF).
* <BR>
* => 1st byte 0x00 can be used to identify extended records
* <BR>
* => 1st byte 0xFF can be used for special purposes.
*
* Whatever record type is present, it should be possible to recognise
* the type, read the header and skip the record without having to
* seek back or read superfluous data.
* <BR>
* => Bytes 2-4 are interpreted as the offset to the end of the record
* whatever the record, so that the total record size is equal
* to sizeof(sal_uInt32) + OffsetToEndOfRec
*
* The records should be easy to parse and constructed uniformly
* <BR>
* => They build on each, for instance the SfxMiniRecord is contained
* in all others
*
* It should be possible to distinguish the record from Drawing Engine
* ones. These start with 'DRMD' und 'DRVW'.
* <BR>
* => Mini-Records with Pre-Tag 'D' can only be up to 4MB in size,
* to avoid confusion.
*
* @par Extensions
* Plans are to extend the file format in such a way that the high nibble
* of the record type has special duties. For instance it is planned
* to mark Record-Contents als 'consisting only of Records'. That way
* a file viewer could automatically parse these structures without
* risking encountering data that looks like records, but actually is
* flat data. Those further extensions are prepared to the extent
* that in type comparisons the high nibble is not taken into account.
*
* @see SfxMiniRecordWriter
*/
class SVL_DLLPUBLIC SfxMiniRecordReader
{
protected:
SvStream* _pStream; // <SvStream> to read from
sal_uInt32 _nEofRec; // Position direcly after the record
bool _bSkipped; // TRUE: the record was skipped explicitly
sal_uInt8 _nPreTag; // Pre-Tag read from the heather
// three phase constructor for sub-classes
SfxMiniRecordReader()
: _pStream(nullptr)
, _nEofRec(0)
, _bSkipped(false)
, _nPreTag(0)
{
}
void Construct_Impl( SvStream *pStream )
{
_pStream = pStream;
_bSkipped = false;
_nPreTag = SFX_REC_PRETAG_EXT;
}
inline bool SetHeader_Impl( sal_uInt32 nHeader );
// mark as invalid and seek back
void SetInvalid_Impl( sal_uInt32 nRecordStartPos )
{
_nPreTag = SFX_REC_PRETAG_EOR;
_pStream->Seek( nRecordStartPos );
}
public:
SfxMiniRecordReader( SvStream *pStream, sal_uInt8 nTag );
inline ~SfxMiniRecordReader();
inline void Skip();
private:
SfxMiniRecordReader( const SfxMiniRecordReader& ) = delete;
SfxMiniRecordReader& operator=(const SfxMiniRecordReader&) = delete;
};
/**
*
* With instances of this class a record ban be written to a stream,
* whose only contents is identified by a sal_uInt16 tag and a
* sal_uInt8 version number. Also the length of the record is stored
* so that older versions or readers that do not known the
* record type (tag) can skip it.
*
* The size can be given directly or calculated automatically from
* the difference between the tell() return values before and
* after streaming the contents.
*
* To allow for forward and backward compatibility, newer versions
* of the data must always include the older versions completely,
* it is only allowed to append new data!
*
* @par File Format
*
* 1* sal_uInt8 Pre-Tag (!= 0)
* 1* 3-sal_uInt8 OffsetToEndOfRec in bytes
* 1* sal_uInt8 Record-Type (==SFX_REC_TYPE_SINGLE)
* 1* sal_uInt8 Content-Version
* 1* sal_uInt16 Content-Tag
* SizeOfContent* sal_uInt8 Content
*/
class SVL_DLLPUBLIC SfxSingleRecordWriter: public SfxMiniRecordWriter
{
protected:
SfxSingleRecordWriter( sal_uInt8 nRecordType,
SvStream *pStream,
sal_uInt16 nTag, sal_uInt8 nCurVer );
public:
sal_uInt32 Close();
};
/**
*
* With instances of this class simple records can be read from a stream,
* that were written with class <SfxSingleRecordWriter>.
*
* It is also possible to skip the record without knowing the internal format.
*/
class SVL_DLLPUBLIC SfxSingleRecordReader: public SfxMiniRecordReader
{
protected:
sal_uInt16 _nRecordTag; // type of the complete contents
sal_uInt8 _nRecordType; // Record Type from the header
// Three phase constructor for derived classes
SfxSingleRecordReader()
: _nRecordTag(0)
, _nRecordType(0)
{
}
void Construct_Impl( SvStream *pStream )
{
SfxMiniRecordReader::Construct_Impl( pStream );
}
bool FindHeader_Impl( sal_uInt16 nTypes, sal_uInt16 nTag );
};
/**
*
* Instances of this class can be used to write a record to a stream,
* which stores its own length so that it can be skipped by
* older versions and readers that do not known the record type (tag).
*
* It contains multiple contents of the same type (tag) and the same
* version, which have been identified once and for all in the
* header of the record. All contents have a length which is
* known in advance and identical.
*
* To be able to guarantee forward and backwards compatibility,
* newer versions of the that must always completely contain
* the old version, so it is only allowed to append data!
* Obviously, only the data of the individual contents are meant,
* the number of contents is naturally variable, and should be
* treated as such by the reading application.
*
* @par File format
*
* 1* sal_uInt8 Pre-Tag (==0)
* 1* 3-sal_uInt8 OffsetToEndOfRec in bytes
* 1* sal_uInt8 Record-Type (==SFX_REC_TYPE_FIXSIZE)
* 1* sal_uInt8 Content-Version
* 1* sal_uInt16 Content-Tag
* 1* sal_uInt16 NumberOfContents
* 1* sal_uInt32 SizeOfEachContent
* NumberOfContents* (
* SizeOfEachContent sal_uInt8 Content
* )
*
* @par Example
* @code
* {
* SfxMultiFixRecordWriter aRecord( pStream, MY_TAG_X, MY_VERSION );
* for ( sal_uInt16 n = 0; n < Count(); ++n )
* {
* aRecord.NewContent();
* *aRecord << aMember1[n];
* *aRecord << aMember2[n];
* }
* }
* @endcode
*/
class SVL_DLLPUBLIC SfxMultiFixRecordWriter: public SfxSingleRecordWriter
{
protected:
sal_uInt32 _nContentStartPos; /* start position of respective
content - only with DBG_UTIL
and for subclasses */
sal_uInt32 _nContentSize; // size of each content
sal_uInt16 _nContentCount; // number of contents
SfxMultiFixRecordWriter( sal_uInt8 nRecordType,
SvStream *pStream,
sal_uInt16 nTag,
sal_uInt8 nCurVer );
public:
inline ~SfxMultiFixRecordWriter();
sal_uInt32 Close();
};
/** write record with multiple content items
*
* Write a record into a stream that stores its own size. This allows it to be
* skipped with old versions or readers if they do not know the record type (= tag).
*
* It contains multiple content items of the same tag and version, that are both
* stored in the header of the record. The size of each content will be calculated
* automatically and stored so that single content items can be skipped without
* having to read them.
*
* @par File Format
*
* 1* sal_uInt8 Pre-Tag (==0)
* 1* 3-sal_uInt8 OffsetToEndOfRec in Bytes
* 1* sal_uInt8 Record-Type (==SFX_FILETYPE_TYPE_VARSIZE)
* 1* sal_uInt8 Content-Version
* 1* sal_uInt16 Content-Tag
* 1* sal_uInt16 NumberOfContents
* 1* sal_uInt32 OffsetToOfsTable
* NumberOfContents* (
* ContentSize* sal_uInt8 Content
* )
* NumberOfContents* sal_uInt32 ContentOfs (shifted each <<8)
*
* @par Example
* @code
* {
* SfxMultiVarRecordWriter aRecord( pStream, MY_TAG_X, MY_VERSION );
* for ( sal_uInt16 n = 0; n < Count(); ++n )
* {
* aRecord.NewContent();
* *aRecord << aMember1[n];
* *aRecord << aMember2[n];
* }
* }
* @endcode
*
* @note To ensure up- and downwards compatibility, new versions need to include
* the data of the older ones and are only allowed to add data afterwards.
*/
class SVL_DLLPUBLIC SfxMultiVarRecordWriter: public SfxMultiFixRecordWriter
{
protected:
std::vector<sal_uInt32> _aContentOfs;
sal_uInt16 _nContentVer; // only for SfxMultiMixRecordWriter
SfxMultiVarRecordWriter( sal_uInt8 nRecordType,
SvStream *pStream,
sal_uInt16 nRecordTag );
void FlushContent_Impl();
public:
SfxMultiVarRecordWriter( SvStream *pStream,
sal_uInt16 nRecordTag );
virtual ~SfxMultiVarRecordWriter();
void NewContent();
sal_uInt32 Close();
};
/** write record with multiple content items with identical size
*
* Write a record into a stream that stores its own size. This allows it to be
* skipped with old versions or readers if they do not know the record type (= tag).
*
* It contains multiple content items of the same tag and version, that are both
* stored in the header of the record. All content items have a known identical
* size.
*
* @par File Format
*
* 1* sal_uInt8 Pre-Tag (==0)
* 1* 3-sal_uInt8 OffsetToEndOfRec in Bytes
* 1* sal_uInt8 record type (==SFX_REC_TYPE_MIXTAGS)
* 1* sal_uInt8 content version
* 1* sal_uInt16 record tag
* 1* sal_uInt16 NumberOfContents
* 1* sal_uInt32 OffsetToOfsTable
* NumberOfContents* (
* 1* sal_uInt16 content tag
* ContentSize* sal_uInt8 content
* )
* NumberOfContents* sal_uInt32 ( ContentOfs << 8 + Version )
*
* @note To ensure up- and downwards compatibility, new versions need to include
* the data of the older ones and are only allowed to add data afterwards.
*/
class SVL_DLLPUBLIC SfxMultiMixRecordWriter: public SfxMultiVarRecordWriter
{
public:
inline SfxMultiMixRecordWriter( SvStream *pStream,
sal_uInt16 nRecordTag );
void NewContent( sal_uInt16 nTag, sal_uInt8 nVersion );
};
/** Read multiple content items of an existing record
*
* Instances of this class allow to read multiple content items of a record
* that was written with
* - SfxMultiFixRecordWriter
* - SfxMultiVarRecordWriter
* - SfxMultiMixRecordWriter
*
* It is possible to skip single content or the whole record without knowing
* its internal format.
*
* @par Example
* @code
* {
* SfxMultiRecordReader aRecord( pStream );
* for ( sal_uInt16 nRecNo = 0; aRecord.GetContent(); ++nRecNo )
* {
* switch ( aRecord.GetTag() )
* {
* case MY_TAG_X:
* X *pObj = new X;
* *aRecord >> pObj.>aMember1;
* if ( aRecord.HasVersion(2) )
* *aRecord >> pObj->aMember2;
* Append( pObj );
* break;
*
* ...
* }
* }
* }
* @endcode
*/
class SVL_DLLPUBLIC SfxMultiRecordReader: public SfxSingleRecordReader
{
sal_uInt32 _nStartPos; // start position of this record
sal_uInt32* _pContentOfs; // offsets of the start positions
sal_uInt32 _nContentSize; // size of each record or table position
sal_uInt16 _nContentCount; // number of content items
sal_uInt16 _nContentNo; /* the index of the current content
contains the next content's index
for GetContent() */
sal_uInt16 _nContentTag; // tag of the current content
sal_uInt8 _nContentVer; // version of the current content
bool ReadHeader_Impl();
public:
SfxMultiRecordReader( SvStream *pStream, sal_uInt16 nTag );
~SfxMultiRecordReader();
bool GetContent();
inline sal_uInt16 GetContentTag();
inline sal_uInt8 GetContentVersion() const;
};
/** create a mini record
*
* The content size is calculated automatically after streaming.
*
* @param pStream the stream that will contain the record
* @param nTag a record tag between 0x01 and 0xFE
*/
inline SfxMiniRecordWriter::SfxMiniRecordWriter( SvStream* pStream, sal_uInt8 nTag )
: _pStream( pStream ),
_nStartPos( pStream->Tell() ),
_bHeaderOk(false),
_nPreTag( nTag )
{
DBG_ASSERT( _nPreTag != 0xFF, "invalid Tag" );
SAL_INFO("svl", "SfxFileRec: writing record to " << pStream->Tell());
pStream->SeekRel( + SFX_REC_HEADERSIZE_MINI );
}
/** The destructor closes the record automatically if not done earlier */
inline SfxMiniRecordWriter::~SfxMiniRecordWriter()
{
// the header was not written, yet, or needs to be checked
if ( !_bHeaderOk )
Close();
}
/** The dtor moves the stream automatically to the position directly behind the record */
inline SfxMiniRecordReader::~SfxMiniRecordReader()
{
if ( !_bSkipped )
Skip();
}
/** position the stream directly behind the record's end */
inline void SfxMiniRecordReader::Skip()
{
_pStream->Seek(_nEofRec);
_bSkipped = true;
}
/// @see SfxMiniRecordWriter::Close()
inline sal_uInt32 SfxSingleRecordWriter::Close()
{
sal_uInt32 nRet = 0;
// was the header already written?
if ( !_bHeaderOk )
{
// write base class header
sal_uInt32 nEndPos = SfxMiniRecordWriter::Close( false/*bSeekToEndOfRec*/ );
// seek the end of the own header if needed or stay behind the record
_pStream->SeekRel( SFX_REC_HEADERSIZE_SINGLE );
nRet = nEndPos;
}
#ifdef DBG_UTIL
else
// check base class header
SfxMiniRecordWriter::Close( false/*bSeekToEndOfRec*/ );
#endif
return nRet;
}
/** The destructor closes the record automatically if not done earlier */
inline SfxMultiFixRecordWriter::~SfxMultiFixRecordWriter()
{
// the header was not written, yet, or needs to be checked
if ( !_bHeaderOk )
Close();
}
/**
* Creates a SfxMultiMixRecord in the given stream with a separate tags and
* versions of its content parts. The sizes of each part are calculated
* automatically.
*
* @param pStream target stream in which the record will be created
* @param nRecordTag tag for the total record
*/
inline SfxMultiMixRecordWriter::SfxMultiMixRecordWriter( SvStream* pStream,
sal_uInt16 nRecordTag )
: SfxMultiVarRecordWriter( SFX_REC_TYPE_MIXTAGS, pStream, nRecordTag )
{
}
/** @returns the tag of the last opened content
* @see SfxMultiRecordReder::GetContent()
*/
inline sal_uInt16 SfxMultiRecordReader::GetContentTag()
{
return _nContentTag;
}
/** @returns the version of the last opened content
* @see SfxMultiRecordReder::GetContent()
*/
inline sal_uInt8 SfxMultiRecordReader::GetContentVersion() const
{
return _nContentVer;
}
#endif
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