mirror of https://github.com/tongzx/nt5src
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.
133 lines
3.7 KiB
133 lines
3.7 KiB
//+---------------------------------------------------------------------------
|
|
//
|
|
// Microsoft Windows
|
|
// Copyright (C) Microsoft Corporation, 1991 - 1998.
|
|
//
|
|
// File: CIDIR.HXX
|
|
//
|
|
// Contents: Persistent directory
|
|
//
|
|
// Classes: CiDirectory
|
|
//
|
|
// History: 3-Apr-91 BartoszM Created stub.
|
|
// 3-May-96 dlee Don't read it in -- map on-disk data
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
#pragma once
|
|
|
|
#include <pdir.hxx>
|
|
#include <pstore.hxx>
|
|
|
|
class CiStorage;
|
|
class CiDirectoryIter;
|
|
class PMmStream;
|
|
|
|
//+---------------------------------------------------------------------------
|
|
//
|
|
// Class: CiDirectory
|
|
//
|
|
// Purpose: Persistent Directory
|
|
//
|
|
// History: 13-Jun-91 BartoszM Created
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
class CiDirectory : public PDirectory
|
|
{
|
|
public:
|
|
|
|
CiDirectory( CiStorage & storage,
|
|
WORKID objectId,
|
|
PStorage::EOpenMode mode );
|
|
|
|
void Add( BitOffset& posKey, const CKeyBuf& key );
|
|
|
|
void Close();
|
|
|
|
void Seek( const CKey& key, CKeyBuf *pKeyInit, BitOffset& off );
|
|
void Seek( const CKeyBuf& key, CKeyBuf *pKeyInit, BitOffset& off );
|
|
void SeekNext( const CKeyBuf &key, CKeyBuf *pKeyInit, BitOffset& off );
|
|
|
|
unsigned CountLeaf() const { return _cKeys; }
|
|
|
|
void LokBuildDir(const CKeyBuf & maxKey );
|
|
void LokFlushDir(const CKeyBuf & maxKey );
|
|
void DeleteKeysAfter( const CKeyBuf & key );
|
|
|
|
void MakeBackupCopy( PStorage & dstStorage,
|
|
PSaveProgressTracker & progressTracker );
|
|
|
|
#if (CIDBG == 1)
|
|
CKeyBuf const & GetLastKey()
|
|
{
|
|
return _keyLast;
|
|
}
|
|
|
|
BitOffset const & GetBitOffsetLastAdded()
|
|
{
|
|
return _bitOffLastAdded;
|
|
}
|
|
|
|
void SetBitOffsetLastAdded( ULONG page, ULONG offset )
|
|
{
|
|
_bitOffLastAdded.SetPage( page );
|
|
_bitOffLastAdded.SetOff( offset );
|
|
}
|
|
#endif // CIDBG == 1
|
|
|
|
// for debugging
|
|
|
|
unsigned Level1Count() { return _cKeys; }
|
|
unsigned Level2Count() { return _cLevel2Keys; }
|
|
CDirectoryKey & GetLevel1Key( unsigned i ) { return *_aKeys[i]; }
|
|
CDirectoryKey & GetLevel2Key( unsigned i ) { return *_aLevel2Keys[i]; }
|
|
|
|
private:
|
|
|
|
// This must be a power of 2. Avg CDirectoryKey size on index1 is
|
|
// 36.3 bytes, which means 112.8 keys per 4096k page. A fanout of
|
|
// 64 means about 1.5 page hits per seek, and a Level2 total size
|
|
// of about 39k.
|
|
|
|
enum { eDirectoryFanOut = 64 };
|
|
|
|
void LokClose();
|
|
|
|
ULONG DoSeekForKeyBuf( const CKeyBuf & key,
|
|
CDirectoryKey ** aKeys,
|
|
ULONG low,
|
|
ULONG cKeys );
|
|
|
|
void GrowIfNeeded( unsigned cbToGrow );
|
|
|
|
void LokWriteKey( const CKeyBuf & key,
|
|
BitOffset & bitOffset );
|
|
|
|
void ReadIn( BOOL fWrite = FALSE );
|
|
|
|
void ReMapIfNeeded( void );
|
|
|
|
WORKID _objectId;
|
|
|
|
unsigned _cKeys;
|
|
unsigned _cLevel2Keys;
|
|
XArray<CDirectoryKey *> _aKeys;
|
|
XArray<CDirectoryKey *> _aLevel2Keys;
|
|
|
|
CiStorage & _storage;
|
|
BOOL _fReadOnly;
|
|
|
|
ULONG * _pcKeys; // array of 2 ulong counts
|
|
BYTE * _pbCurrent; // current end of the file
|
|
|
|
XPtr<PMmStream> _stream;
|
|
CMmStreamBuf _streamBuf;
|
|
|
|
#if (CIDBG == 1)
|
|
CKeyBuf _keyLast; // Last key retrieved from directory
|
|
BitOffset _bitOffLastAdded; // Bit offset of the last key added
|
|
#endif // CIDBG == 1
|
|
};
|
|
|
|
|