172 lines
4.3 KiB
C++
172 lines
4.3 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 - 1996.
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//
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// File: Smatch.hxx
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//
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// Classes: CScopeMatch
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//
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// History: 07 Feb 96 KyleP Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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//+---------------------------------------------------------------------------
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//
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// Class: CScopeMatch
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//
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// Purpose: A small helper class to test if a given path matches a
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// scope or not.
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//
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// History: 1-22-96 srikants Created
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//
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// Notes: This is useful for determining if a given path is in
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// a scope or not.
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//
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//----------------------------------------------------------------------------
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class CScopeMatch
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{
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public:
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CScopeMatch( ) :
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_pwcsRoot(0), _len(0)
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{
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}
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CScopeMatch( WCHAR const * pwcsRoot, ULONG len ) :
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_pwcsRoot(0), _len(0)
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{
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Init( pwcsRoot, len );
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}
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void Init( WCHAR const * pwcsRoot, ULONG len )
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{
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Win4Assert( 0 == _len || 0 != _pwcsRoot );
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_pwcsRoot = pwcsRoot;
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_len = len;
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if ( _len > 0 && L'\\' == _pwcsRoot[_len-1] )
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{
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if( _len > 1 )
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_len--;
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else
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{
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_pwcsRoot = 0;
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_len = 0;
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}
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}
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}
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inline BOOL IsInScope( WCHAR const * pwcsPath, ULONG len ) const;
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inline BOOL IsPrefix( WCHAR const * pwcsPath, ULONG len ) const;
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inline BOOL IsNullScope() const { return 0 == _pwcsRoot; }
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private:
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WCHAR const * _pwcsRoot;
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ULONG _len;
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};
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//+---------------------------------------------------------------------------
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//
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// Member: CScopeMatch::IsInScope
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//
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// Synopsis: Tests if a given path is in the scope of this object.
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// I.e., is the path in the scope a prefix of the input
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// path.
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//
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// Arguments: [wcsPath] - Path to be tested. Must NOT be NULL.
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// [len] - Length of this path.
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//
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// Returns: TRUE if the given path is in the scope. FALSE o/w
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//
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// History: 1-22-96 srikants Created
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//
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//----------------------------------------------------------------------------
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inline BOOL CScopeMatch::IsInScope( WCHAR const * wcsPath, ULONG len ) const
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{
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//
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// It is possible to have a NULL string ("") with length 0.
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//
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Win4Assert( 0 == len || 0 != wcsPath );
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// if the scope root is NULL, match with everything
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if ( 0 == _pwcsRoot || 0 == _len )
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return TRUE;
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//
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// Test directory must be at least as long as scope
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//
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if ( _len > len )
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return( FALSE );
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else if ( _len < len )
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{
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//
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// Make sure path has a path separator at the same place the
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// scope directory name ends.
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//
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if ( wcsPath[_len] != L'\\' )
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return( FALSE );
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}
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return RtlEqualMemory( wcsPath, _pwcsRoot, _len * sizeof(WCHAR) );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CScopeMatch::IsPrefix
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//
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// Synopsis: Tests if a given path is a prefix of the scope.
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//
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// Arguments: [wcsPath] - Path to be tested. May be NULL. May
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// optionally have a \ at the end.
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// [len] - Length of this path.
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//
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// Returns: TRUE if the given path prefixes the scope. FALSE o/w
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//
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// History: 1-22-96 srikants Created
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//
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//----------------------------------------------------------------------------
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inline BOOL CScopeMatch::IsPrefix( WCHAR const * wcsPath, ULONG len ) const
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{
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// remove optional trailing '\' on input path
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if ( len > 0 && wcsPath[len-1] == L'\\')
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len --;
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// Null paths prefix everything.
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if ( 0 == len || 0 == wcsPath )
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return TRUE;
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//
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// Test directory name must be up to as long as the scope
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//
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if ( len > _len )
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return FALSE;
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else if ( len < _len )
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{
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//
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// Make sure the scope name has a path separator at the same place the
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// input directory name ends
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//
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if ( _pwcsRoot[ len ] != L'\\' )
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return FALSE;
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}
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return RtlEqualMemory( wcsPath, _pwcsRoot, len * sizeof(WCHAR) );
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}
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