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