320 lines
8.5 KiB
C++
320 lines
8.5 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1991 - 1992.
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//
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// File: NOISE.HXX
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//
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// Contents: Noise word list
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//
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// Classes: CNoiseList, NoiseListInit, NoiseListEmpty
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// CLString, CStringList, CStringTable
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//
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// History: 11-Jul-91 BartoszM Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <plang.hxx>
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const NOISE_WORD_LENGTH = cbKeyPrefix + sizeof( WCHAR ); // word length for detecting
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// and filtering noise words
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//+---------------------------------------------------------------------------
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//
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// Class: CLString
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//
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// Purpose: Linkable String
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//
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// History: 16-Jul-91 BartoszM Created
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//
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//----------------------------------------------------------------------------
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class CLString
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{
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public:
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CLString ( UINT cb, const BYTE* buf, CLString* next );
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void* operator new ( size_t n, UINT cb );
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#if _MSC_VER >= 1200
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void operator delete( void * p, UINT cb )
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{
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::delete(p);
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}
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void operator delete( void * p )
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{
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::delete(p);
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}
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#endif
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inline BOOL Equal ( UINT cb, const BYTE* str ) const;
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CLString * Next() { return _next; }
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#if CIDBG == 1
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void Dump() const { ciDebugOut (( DEB_ITRACE, "%s ", _buf )); }
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#endif
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private:
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CLString * _next;
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UINT _cb;
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#pragma warning(disable : 4200) // 0 sized array in struct is non-ansi
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BYTE _buf[];
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#pragma warning(default : 4200)
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};
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//+---------------------------------------------------------------------------
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//
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// Member: CLString::Equal, public
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//
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// Synopsis: String comparison
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//
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// Arguments: [cb] -- length
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// [str] -- string
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//
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// History: 16-Jul-91 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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inline BOOL CLString::Equal ( UINT cb, const BYTE* str ) const
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{
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return ( (cb == _cb) && (memcmp ( str, _buf, _cb ) == 0) );
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}
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//+---------------------------------------------------------------------------
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//
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// Class: CStringList
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//
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// Purpose: List of Linkable Strings
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//
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// History: 16-Jul-91 BartoszM Created
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//
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//----------------------------------------------------------------------------
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class CStringList
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{
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public:
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CStringList(): _head(0) {}
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~CStringList();
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void Add ( UINT cb, const BYTE * str );
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BOOL Find ( UINT cb, const BYTE* str ) const;
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BOOL IsEmpty () const { return _head == 0; }
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#if CIDBG == 1
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void Dump() const;
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#endif
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private:
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CLString * _head;
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CStringTable
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//
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// Purpose: Hash Table of strings
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//
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// History: 16-Jul-91 BartoszM Created
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//
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//----------------------------------------------------------------------------
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class CStringTable
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{
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public:
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CStringTable( UINT size );
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~CStringTable();
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void Add ( UINT cb, const BYTE* str, UINT hash );
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inline BOOL Find ( UINT cb, const BYTE* str, UINT hash ) const;
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#if CIDBG == 1
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void Dump() const;
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#endif
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private:
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UINT _index ( UINT hash ) const { return hash % _size; }
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UINT _size;
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CStringList* _bucket;
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};
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//+---------------------------------------------------------------------------
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//
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// Member: CStringTable::Find, public
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//
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// Synopsis: String comparison
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//
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// Arguments: [cb] -- length
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// [str] -- string
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//
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// History: 16-Jul-91 BartoszM Created.
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//
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//----------------------------------------------------------------------------
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inline BOOL CStringTable::Find ( UINT cb, const BYTE* str, UINT hash ) const
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{
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return _bucket [ _index(hash) ].Find ( cb, str );
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}
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class PKeyRepository;
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//+---------------------------------------------------------------------------
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//
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// Class: CNoiseList
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//
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// Purpose: Discard meaningless words from the input stream
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//
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// History: 02-May-91 BartoszM Created stub.
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// 30-May-91 t-WadeR Created first draft.
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//
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//----------------------------------------------------------------------------
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class CNoiseList: public PNoiseList
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{
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public:
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CNoiseList( const CStringTable& table, PKeyRepository& krep );
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~CNoiseList() {};
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void GetBuffers( UINT** ppcbInBuf, BYTE** ppbInBuf );
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void GetFlags ( BOOL** ppRange, CI_RANK** ppRank );
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void PutAltWord( UINT hash );
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void PutWord( UINT hash );
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void StartAltPhrase();
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void EndAltPhrase();
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void SkipNoiseWords( ULONG cWords )
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{
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_cNoiseWordsSkipped += cWords;
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*_pocc += cWords;
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}
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void SetOccurrence( OCCURRENCE occ ) { *_pocc = occ; }
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BOOL FoundNoise() { return _fFoundNoise; }
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OCCURRENCE GetOccurrence() { return *_pocc; }
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private:
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const CStringTable& _table;
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UINT _cbMaxOutBuf;
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UINT* _pcbOutBuf;
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BYTE* _pbOutBuf;
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PKeyRepository& _krep;
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OCCURRENCE* _pocc;
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BOOL _fFoundNoise; // One way trigger to TRUE when noise word found.
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ULONG _cNoiseWordsSkipped; // count of noise words that haven't
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// been passed onto the key repository.
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// Care must be taken to ensure that
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// noise words at the same occurrence
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// (ie alternate words) are not counted
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// multiple times.
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ULONG _cNonNoiseAltWords; // count of non-noise words at current
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// occurrence
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CNoiseListInit
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//
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// Purpose: Initializer for the noise list
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//
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// History: 16-Jul-91 BartoszM Created
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//
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//----------------------------------------------------------------------------
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class CNoiseListInit: INHERIT_VIRTUAL_UNWIND, public PNoiseList
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{
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INLINE_UNWIND( CNoiseListInit )
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public:
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CNoiseListInit( UINT size );
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~CNoiseListInit() { delete _table; };
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void GetBuffers( UINT** ppcbInBuf, BYTE** ppbInBuf );
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void PutAltWord( UINT hash );
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void PutWord( UINT hash );
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CStringTable * AcqStringTable()
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{
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CStringTable* tmp = _table;
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_table = 0;
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return tmp;
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}
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private:
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CKeyBuf _key;
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CStringTable * _table;
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CNoiseListEmpty
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//
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// Purpose: Empty Noise List (used as default)
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//
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// History: 16-Jul-91 BartoszM Created
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//
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//----------------------------------------------------------------------------
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class CNoiseListEmpty: public PNoiseList
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{
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public:
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CNoiseListEmpty( PKeyRepository& krep, ULONG ulFuzzy );
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void GetBuffers( UINT** ppcbInBuf, BYTE** ppbInBuf );
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void GetFlags ( BOOL** ppRange, CI_RANK** ppRank );
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void PutAltWord( UINT hash );
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void PutWord( UINT hash );
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void StartAltPhrase();
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void EndAltPhrase();
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void SkipNoiseWords( ULONG cWords )
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{
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_cNoiseWordsSkipped += cWords;
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*_pocc += cWords;
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}
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void SetOccurrence( OCCURRENCE occ ) { *_pocc = occ; }
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BOOL FoundNoise() { return _fFoundNoise; }
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OCCURRENCE GetOccurrence() { return *_pocc; }
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private:
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UINT _cbMaxOutBuf;
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UINT* _pcbOutBuf;
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BYTE* _pbOutBuf;
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PKeyRepository& _krep;
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OCCURRENCE* _pocc;
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ULONG _ulGenerateMethod; // Fuzzines of query
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BOOL _fFoundNoise; // One way trigger to TRUE when noise word found.
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ULONG _cNoiseWordsSkipped; // count of noise words that haven't
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// been passed onto the key repository.
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// Care must be taken to ensure that
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// noise words at the same occurrence
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// (ie alternate words) are not counted
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// multiple times.
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ULONG _cNonNoiseAltWords; // count of non-noise words at current
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// occurrence
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};
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