164 lines
3.6 KiB
C++
164 lines
3.6 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1994.
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//
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// File: alias.hxx
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//
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// Classes: CAliasBlock
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// CAliases
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//
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// History: 26-May-94 DrewB Created
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//
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//----------------------------------------------------------------------------
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#ifndef __ALIAS_HXX__
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#define __ALIAS_HXX__
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// Number of alias slots to allocate in a chunk
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#define ALIAS_BLOCK_SIZE 64
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typedef WORD ALIAS;
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#define INVALID_ALIAS ((ALIAS)0xffff)
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// Aliases should not be zero because this causes error detection problems
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#define INITIAL_ALIAS ((ALIAS)1)
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// Values cannot be zero, this allows us to detect free slots in the
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// value array
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#define INVALID_VALUE ((DWORD)0)
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//+---------------------------------------------------------------------------
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//
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// Class: CAliasBlock (ab)
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//
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// Purpose: A block of values indexed by alias
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//
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// History: 26-May-94 DrewB Created
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//
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//----------------------------------------------------------------------------
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class CAliasBlock
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{
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public:
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CAliasBlock(ALIAS aliasBase,
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CAliasBlock *pabNext);
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BOOL ContainsAlias(ALIAS alias)
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{
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return alias >= _aliasBase && alias < _aliasBase+ALIAS_BLOCK_SIZE;
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}
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DWORD AliasValue(ALIAS alias)
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{
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thkAssert(!IsFree(alias));
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return _dwValues[AliasIndex(alias)];
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}
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void RemoveAlias(ALIAS alias)
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{
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thkAssert(!IsFree(alias));
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#if DBG == 1
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CheckFree();
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#endif
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thkAssert(_iFilled > 0);
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_iFilled--;
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_dwValues[AliasIndex(alias)] = INVALID_VALUE;
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}
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void SetValue(ALIAS alias, DWORD dwValue)
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{
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thkAssert(!IsFree(alias));
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thkAssert(dwValue != INVALID_VALUE);
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_dwValues[AliasIndex(alias)] = dwValue;
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}
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ALIAS ValueAlias(DWORD dwValue);
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ALIAS AddValue(DWORD dwValue);
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CAliasBlock *GetNext(void)
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{
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return _pabNext;
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}
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void SetNext(CAliasBlock *pab)
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{
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_pabNext = pab;
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}
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int AliasesFilled(void)
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{
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return _iFilled;
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}
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#if DBG == 1
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BOOL IsFree(ALIAS alias)
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{
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return _dwValues[AliasIndex(alias)] == INVALID_VALUE;
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}
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#endif
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private:
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int AliasIndex(ALIAS alias)
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{
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thkAssert(ContainsAlias(alias));
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return (int)(alias-_aliasBase);
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}
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ALIAS IndexAlias(int iIndex)
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{
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thkAssert(iIndex >= 0 && iIndex < ALIAS_BLOCK_SIZE);
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return (ALIAS)(iIndex+_aliasBase);
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}
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#if DBG == 1
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void CheckFree(void);
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#endif
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ALIAS _aliasBase;
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int _iFilled;
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DWORD _dwValues[ALIAS_BLOCK_SIZE];
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CAliasBlock *_pabNext;
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CAliases (aliases)
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//
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// Purpose: Maintains a set of aliases for values
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//
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// History: 26-May-94 DrewB Created
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//
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// Notes: Values must be unique
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//
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//----------------------------------------------------------------------------
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class CAliases
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{
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public:
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CAliases(void)
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: _abStatic(INITIAL_ALIAS, NULL)
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{
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// Start alias list with the static block
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_pabAliases = &_abStatic;
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// The static block takes the first block of aliases
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_aliasBase = INITIAL_ALIAS+ALIAS_BLOCK_SIZE;
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}
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~CAliases(void);
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DWORD AliasValue(ALIAS alias);
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ALIAS ValueAlias(DWORD dwValue);
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ALIAS AddValue(DWORD dwValue);
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void RemoveAlias(ALIAS alias);
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void SetValue(ALIAS alias, DWORD dwValue);
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private:
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void DeleteBlock(CAliasBlock *pab, CAliasBlock *pabPrev);
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CAliasBlock _abStatic;
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CAliasBlock *_pabAliases;
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ALIAS _aliasBase;
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};
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#endif // #ifndef __ALIAS_HXX__
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