You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
615 lines
16 KiB
615 lines
16 KiB
//+---------------------------------------------------------------------------
|
|
//
|
|
// Microsoft Windows
|
|
// Copyright (C) Microsoft Corporation, 1991 - 2000.
|
|
//
|
|
// File: PComp.hxx
|
|
//
|
|
// Contents: Persistent index compressor, and decompressor
|
|
//
|
|
// Classes: CCoder, CKeyComp, CPersComp
|
|
//
|
|
// History: 03-Jul-91 KyleP Created
|
|
// 05-Nov-91 BartoszM Restructured to use CCoder
|
|
// 05-Dec-93 w-PatG Restructured to use CKeyComp
|
|
//
|
|
// Notes: The CKeyComp class is under development, testing phase.
|
|
// Several revisions must be made to increase the amount of
|
|
// inheritence, and improve the coding algorithm used by CKeyComp.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
#pragma once
|
|
|
|
#include <keycur.hxx>
|
|
#include <misc.hxx>
|
|
#include <pdir.hxx>
|
|
|
|
#include "bitstm.hxx"
|
|
|
|
#define LINK_MAX_BITS (CI_PAGE_SHIFT + 8) // The max. value of "link" of the persistent index
|
|
#define LINK_MAX_VALUE ( 1 << LINK_MAX_BITS ) //
|
|
|
|
const unsigned OccDeltaBits = 7; // Bits to initially store an
|
|
// occurrence delta.
|
|
class CPageBuffer;
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Class: CCoder
|
|
//
|
|
// Purpose: Common class for encoding/decoding of compressed data
|
|
//
|
|
// Interface:
|
|
//
|
|
// History: 05-Nov-91 BartoszM Created
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
class CCoder
|
|
{
|
|
public:
|
|
|
|
CCoder(WORKID widMax);
|
|
|
|
CCoder(WORKID widMax, const CKeyBuf& keyInit);
|
|
|
|
CCoder(CCoder& orig);
|
|
|
|
virtual ~CCoder();
|
|
|
|
#if DEVL == 1
|
|
void Dump();
|
|
#endif
|
|
|
|
#ifdef CIEXTMODE
|
|
void CiExtDump(void *ciExtSelf);
|
|
#endif
|
|
|
|
|
|
protected:
|
|
|
|
UINT AverageWidBits ( UINT cWid );
|
|
|
|
void SetAverageBits ( UINT cWid )
|
|
{ _cbitAverageWid = AverageWidBits ( cWid ); }
|
|
|
|
const WORKID _widMaximum; // Maximum workid in current index
|
|
|
|
CKeyBuf _key;
|
|
|
|
WORKID _wid;
|
|
|
|
OCCURRENCE _occ;
|
|
|
|
UINT _cbitAverageWid; // Log of the average WorkId delta.
|
|
};
|
|
|
|
__forceinline UINT CCoder::AverageWidBits ( UINT cWid )
|
|
{
|
|
ciAssert ( cWid != 0 );
|
|
ciAssert ( _widMaximum / cWid != 0 );
|
|
UINT x = Log2(_widMaximum / cWid);
|
|
ciAssert ( x <= ULONG_BITS );
|
|
ciAssert ( x > 0 );
|
|
return x;
|
|
}
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Class: CKeyComp (kcomp)
|
|
//
|
|
// Purpose: Key compressor
|
|
//
|
|
// Interface: (Under development)
|
|
//
|
|
// History: 12-Nov-93 w-PatG Created.
|
|
//
|
|
// Notes: Derived class that lies between base class CCoder and further
|
|
// derived class CPersCoder.
|
|
//----------------------------------------------------------------------------
|
|
|
|
const LONGLONG eSigKeyComp = 0x20504d4f4359454bi64; // "KEYCOMP"
|
|
|
|
class CKeyComp: public CCoder
|
|
{
|
|
public:
|
|
|
|
CKeyComp(CPhysIndex& phIndex, WORKID widMax, BOOL fUseLinks = TRUE);
|
|
CKeyComp(CPhysIndex& phIndex,
|
|
WORKID widMax,
|
|
const BitOffset & bitOffRestart,
|
|
const BitOffset & bitOffSplitKey,
|
|
const CKeyBuf & splitKey,
|
|
BOOL fUseLinks = TRUE);
|
|
|
|
~CKeyComp();
|
|
|
|
void PutKey(const CKeyBuf * pkey, BitOffset & bitOffCurKey);
|
|
|
|
__forceinline void GetOffset( BitOffset & bitOff )
|
|
{
|
|
_bitStream.GetOffset( bitOff );
|
|
}
|
|
|
|
__forceinline BOOL IsAtSentinel()
|
|
{
|
|
return _key.IsMaxKey();
|
|
}
|
|
|
|
#if DEVL == 1
|
|
void Dump();
|
|
#endif
|
|
|
|
void ZeroToEndOfPage()
|
|
{
|
|
_bitStream.ZeroToEndOfPage();
|
|
}
|
|
|
|
void InitSignature()
|
|
{
|
|
_bitStream.InitSignature();
|
|
}
|
|
|
|
void WriteFirstKeyFull() { _fWriteFirstKeyFull = TRUE; }
|
|
|
|
#ifdef CIEXTMODE
|
|
void CiExtDump(void *ciExtSelf);
|
|
#endif
|
|
|
|
void FreeStream()
|
|
{
|
|
_bitStream.FreeStream();
|
|
_bitStreamLink.FreeStream();
|
|
}
|
|
|
|
protected:
|
|
|
|
void BitCompress(ULONG ul, unsigned cbitAverage);
|
|
|
|
void IBitCompress(ULONG ul, unsigned cbitAverage, unsigned bitSize);
|
|
|
|
void PutPSSize ( unsigned cPrefix, unsigned cSuffix );
|
|
|
|
void PutPid ( PROPID pid );
|
|
|
|
const LONGLONG _sigKeyComp; //
|
|
CPhysIndex & _phIndex; // The Physical Index for the bitstream
|
|
|
|
CWBitStream _bitStream; // must be created first
|
|
|
|
BOOL _fUseLinks;
|
|
CPBitStream _bitStreamLink;
|
|
|
|
BitOffset _bitOffCurKey; // These two bitOffsets are used to rewind
|
|
BitOffset _bitOffLastKey; // the compressor to the previous key.
|
|
|
|
BOOL _fWriteFirstKeyFull; // Write first key on each page fully
|
|
};
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Class: CKeyDeComp (kdcomp)
|
|
//
|
|
// Purpose: Persistent key de-compressor
|
|
//
|
|
// Interface:
|
|
//
|
|
// History: 09-Jul-91 KyleP Created.
|
|
// 22-Nov-93 w-PatG Converted from CPersDeComp
|
|
//
|
|
// Notes: One of the key requirements for using de-compressors is
|
|
// that if an operation fails because the end of page was
|
|
// reached, that *same* operation must be the first one
|
|
// performed on the following compressor.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
const LONGLONG eSigKeyDeComp = 0x504d4f434459454bi64; // "KEYDCOMP"
|
|
|
|
class CKeyDeComp: public CCoder, public CKeyCursor
|
|
{
|
|
public:
|
|
|
|
CKeyDeComp( PDirectory& pDir,
|
|
INDEXID iid,
|
|
CPhysIndex& phIndex,
|
|
WORKID widMax,
|
|
BOOL fUseLinks = TRUE,
|
|
BOOL fUseDir = TRUE );
|
|
|
|
CKeyDeComp( PDirectory& pDir,
|
|
INDEXID iid,
|
|
CPhysIndex& phIndex,
|
|
BitOffset& posKey,
|
|
const CKeyBuf& keyInit,
|
|
const CKey* pKey,
|
|
WORKID widMax,
|
|
BOOL fUseLinks = TRUE,
|
|
BOOL fUseDir = TRUE );
|
|
|
|
CKeyDeComp( CKeyDeComp & decomp );
|
|
|
|
~CKeyDeComp();
|
|
|
|
const CKeyBuf * GetKey();
|
|
|
|
const CKeyBuf * GetNextKey();
|
|
|
|
virtual const CKeyBuf * GetNextKey( BitOffset * pBitOff );
|
|
|
|
virtual const CKeyBuf * GetKey( BitOffset * pBitOff );
|
|
|
|
PROPID Pid();
|
|
|
|
void GetOffset( BitOffset & bitOff );
|
|
|
|
void FreeStream() { _bitStream.FreeStream(); }
|
|
|
|
void RefillStream() { _bitStream.RefillStream(); }
|
|
|
|
//
|
|
// Unused. Required for inheritance.
|
|
//
|
|
|
|
OCCURRENCE Occurrence();
|
|
|
|
OCCURRENCE NextOccurrence();
|
|
|
|
ULONG OccurrenceCount();
|
|
|
|
OCCURRENCE MaxOccurrence();
|
|
|
|
WORKID WorkId();
|
|
|
|
WORKID NextWorkId();
|
|
|
|
ULONG HitCount();
|
|
|
|
#if DEVL == 1
|
|
void Dump();
|
|
#endif
|
|
|
|
#ifdef CIEXTMODE
|
|
void CiExtDump(void *ciExtSelf);
|
|
#endif
|
|
|
|
protected:
|
|
|
|
const CKeyBuf* SeekKey(const CKey* pKey);
|
|
|
|
ULONG BitUnCompress(unsigned cbitAverage);
|
|
|
|
ULONG IBitUnCompress(unsigned cbitAverage, ULONG ulPartial);
|
|
|
|
void LoadKey();
|
|
|
|
void LoadPSSize ( unsigned& cPrefix, unsigned& cSuffix );
|
|
|
|
void LoadPid ();
|
|
|
|
BOOL IsAtSentinel() const { return _fAtSentinel; }
|
|
|
|
const LONGLONG _sigKeyDeComp;
|
|
|
|
CRBitStream _bitStream;
|
|
|
|
BOOL _fUseLinks;
|
|
|
|
BitOffset _bitOffNextKey;
|
|
|
|
PDirectory& _pDir;
|
|
|
|
BOOL _fUseDir;
|
|
BOOL _fAtSentinel; // TRUE if at sentinel (end) key.
|
|
|
|
CPhysIndex & _physIndex;
|
|
|
|
#if (CIDBG == 1)
|
|
BOOL _fLastKeyFromDir; // TRUE if last key looked up in directory
|
|
#else
|
|
BOOL _fDummy; // to keep chk/free size the same
|
|
#endif
|
|
};
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Class: CPersComp (pcomp)
|
|
//
|
|
// Purpose: Persistent index compressor
|
|
//
|
|
// Interface:
|
|
//
|
|
// History: 03-Jul-91 KyleP Created.
|
|
// 02-Dec-93 w-PatG Altered to use CKeyComp.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
const LONGLONG eSigPersComp = 0x504d4f4353524550i64; // "PERSCOMP"
|
|
|
|
class CPersComp: public CKeyComp
|
|
{
|
|
public:
|
|
CPersComp(CPhysIndex& phIndex, WORKID widMax);
|
|
CPersComp(CPhysIndex& phIndex, WORKID widMax,
|
|
const BitOffset & bitOffRestart,
|
|
const BitOffset & bitoffSplitKey,
|
|
const CKeyBuf & splitKey );
|
|
|
|
~CPersComp();
|
|
|
|
void PutKey(const CKeyBuf * pkey,
|
|
ULONG cWorkId,
|
|
BitOffset & bitOffCurKey);
|
|
|
|
void PutWorkId(WORKID wid, OCCURRENCE maxOcc, ULONG cOccurrence);
|
|
|
|
inline void PutOccurrence(OCCURRENCE occ);
|
|
|
|
#if DEVL == 1
|
|
void Dump();
|
|
#endif
|
|
|
|
#ifdef CIEXTMODE
|
|
void CiExtDump(void *ciExtSelf);
|
|
#endif
|
|
|
|
void FreeStream()
|
|
{
|
|
_bitStreamPatch.FreeStream();
|
|
CKeyComp::FreeStream();
|
|
}
|
|
|
|
protected:
|
|
|
|
inline void BackSpace();
|
|
|
|
void SetCWIDAccuracy();
|
|
|
|
void PatchWidCount ();
|
|
|
|
void PutWidCount ( ULONG cWorkId );
|
|
|
|
void SkipWidCount ();
|
|
|
|
void PutMaxOccurrence( OCCURRENCE maxOcc );
|
|
|
|
const LONGLONG _sigPersComp;
|
|
|
|
unsigned _cWidActual; // Used to decide if the originally
|
|
|
|
unsigned _cWidProposed; // Original WorkId count. Used to
|
|
// allocate space for the count.
|
|
|
|
CPBitStream _bitStreamPatch; // Used to back patch wid count
|
|
// created after main _bitStream
|
|
|
|
#if DEVL == 1
|
|
unsigned _cOccLeft; // ciVerify the specified number of
|
|
#endif
|
|
|
|
};
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//----------------------------------------------------------------------------
|
|
inline void CPersComp::BackSpace()
|
|
{
|
|
_bitStream.Seek(_bitOffCurKey);
|
|
if ( _fUseLinks ) _bitStreamLink.Seek(_bitOffLastKey);
|
|
|
|
ZeroToEndOfPage();
|
|
|
|
_phIndex.SetUsedPagesCount( _bitOffCurKey.Page() + 1 );
|
|
_cWidProposed = _cWidActual;
|
|
_key.SetCount( 0 );
|
|
}
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Class: CPersDeComp (pdcomp)
|
|
//
|
|
// Purpose: Persistent index de-compressor
|
|
//
|
|
// Interface:
|
|
//
|
|
// History: 09-Jul-91 KyleP Created.
|
|
// 02-Dec-93 w-PatG Altered to use CKeyComp.
|
|
//
|
|
// Notes: One of the key requirements for using de-compressors is
|
|
// that if an operation fails because the end of page was
|
|
// reached, that *same* operation must be the first one
|
|
// performed on the following compressor.
|
|
//
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
const LONGLONG eSigPersDeComp = 0x504d434453524550i64; // "PERSDCMP"
|
|
|
|
class CPersDeComp: public CKeyDeComp
|
|
{
|
|
public:
|
|
|
|
CPersDeComp(
|
|
PDirectory& pDir,
|
|
INDEXID iid,
|
|
CPhysIndex& phIndex,
|
|
WORKID widMax,
|
|
BOOL fUseLinks = TRUE,
|
|
BOOL fUseDir = TRUE );
|
|
|
|
CPersDeComp(
|
|
PDirectory& pDir,
|
|
INDEXID iid,
|
|
CPhysIndex& phIndex,
|
|
BitOffset& posKey,
|
|
const CKeyBuf& keyInit,
|
|
const CKey* pKey,
|
|
WORKID widMax,
|
|
BOOL fUseLinks = TRUE,
|
|
BOOL fUseDir = TRUE);
|
|
|
|
CPersDeComp(CPersDeComp& orig);
|
|
|
|
~CPersDeComp();
|
|
|
|
const CKeyBuf * GetNextKey();
|
|
|
|
const CKeyBuf * GetNextKey( BitOffset * pbitOff );
|
|
|
|
WORKID WorkId();
|
|
|
|
WORKID NextWorkId();
|
|
|
|
ULONG WorkIdCount();
|
|
|
|
OCCURRENCE Occurrence();
|
|
|
|
OCCURRENCE NextOccurrence();
|
|
|
|
OCCURRENCE MaxOccurrence() { return _maxOcc; }
|
|
|
|
ULONG OccurrenceCount();
|
|
|
|
ULONG HitCount() {
|
|
return OccurrenceCount();
|
|
}
|
|
|
|
void RatioFinished ( ULONG& denom, ULONG& num );
|
|
|
|
#if DEVL == 1
|
|
void Dump();
|
|
#endif
|
|
|
|
#ifdef CIEXTMODE
|
|
void CiExtDump(void *ciExtSelf);
|
|
#endif
|
|
|
|
private:
|
|
|
|
void LoadKey();
|
|
|
|
void FinishKeyLoad();
|
|
|
|
void LoadWorkId();
|
|
|
|
void LoadOccurrence();
|
|
|
|
void LoadFirstOccurrence();
|
|
|
|
void LoadWidCount ();
|
|
|
|
void LoadMaxOccurrence();
|
|
|
|
const LONGLONG _sigPersDeComp;
|
|
|
|
//
|
|
// 'Current' state of the decompressor. These values are always
|
|
// valid and are returned by the various Get functions.
|
|
//
|
|
|
|
ULONG _cWid;
|
|
ULONG _cOcc;
|
|
OCCURRENCE _maxOcc;
|
|
|
|
//
|
|
// 'Transient' state. Helps the decompressor figure out what/where
|
|
// its decompressing.
|
|
//
|
|
|
|
BOOL _fcwidAccurate;
|
|
ULONG _cWidLeft;
|
|
ULONG _cOccLeft;
|
|
};
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CPersComp::PutOccurrence, public
|
|
//
|
|
// Synopsis: Store an occurrence for the current WorkId.
|
|
//
|
|
// Arguments: [occ] -- The occurrence to store.
|
|
//
|
|
// Modifies: [occ] is added to the persistent index.
|
|
//
|
|
// History: 08-Jul-91 KyleP Created.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
__forceinline void CPersComp::PutOccurrence(OCCURRENCE occ)
|
|
{
|
|
ciAssert(occ != OCC_INVALID);
|
|
ciAssert(occ > _occ);
|
|
ciAssert(_cOccLeft > 0);
|
|
|
|
ciDebugOut (( DEB_PCOMP | DEB_NOCOMPNAME,"%d ", occ ));
|
|
|
|
BitCompress(occ - _occ, OccDeltaBits);
|
|
|
|
_occ = occ;
|
|
|
|
#if CIDBG == 1
|
|
_cOccLeft--;
|
|
#endif
|
|
|
|
}
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Member: CKeyComp::BitCompress, private
|
|
//
|
|
// Synopsis: Compress and store a number.
|
|
//
|
|
// Arguments: [ul] -- Number to store.
|
|
//
|
|
// [cbitAverage] -- Minimum number of bits to store.
|
|
//
|
|
// Algorithm: First, store the bottom cbitAverage bits.
|
|
// while there are more bits to store
|
|
// store a 1 bit indicating more to follow
|
|
// store the next n bits, where n = 2, 3, 4, ...
|
|
// store a 0 bit indicating end of sequence
|
|
//
|
|
// History: 08-Jul-91 KyleP Created.
|
|
// 06-Dec-93 w-PatG Moved from CPersComp.
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
__forceinline void CKeyComp::BitCompress(ULONG ul, unsigned cbitAverage)
|
|
{
|
|
ciAssert(cbitAverage > 0);
|
|
ciAssert(cbitAverage <= ULONG_BITS );
|
|
|
|
unsigned bitSize = Log2(ul);
|
|
|
|
//
|
|
// If bitSize < cbitAverage then rightshift
|
|
// to make it cbitAverage and store cbitAverage bits
|
|
// plus the signal bit (0 = done, 1 = more)
|
|
//
|
|
|
|
if (bitSize <= cbitAverage)
|
|
{
|
|
//
|
|
// Store cbitAverage bits of ul
|
|
// plus a trailing 0 bit for end-of-sequence
|
|
// cbitAverage == ULONG_BITS (maximum!) is a special case,
|
|
// no trailing bit is used.
|
|
|
|
if (cbitAverage < ULONG_BITS)
|
|
_bitStream.PutBits(ul << 1, cbitAverage + 1);
|
|
else
|
|
{
|
|
ciAssert(cbitAverage == ULONG_BITS);
|
|
_bitStream.PutBits(ul, ULONG_BITS);
|
|
}
|
|
}
|
|
else
|
|
IBitCompress(ul, cbitAverage, bitSize);
|
|
}
|
|
|
|
__forceinline PROPID CKeyDeComp::Pid()
|
|
{
|
|
return GetKey()?
|
|
_key.Pid():
|
|
pidInvalid;
|
|
}
|
|
|