143 lines
2.9 KiB
C++
143 lines
2.9 KiB
C++
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/*==========================================================================
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*
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* Copyright (C) 2000 Microsoft Corporation. All Rights Reserved.
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*
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* File: strcache.cpp
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* Content: Class for caching strings
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*@@BEGIN_MSINTERNAL
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* History:
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* Date By Reason
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* ==== == ======
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* 02/04/2000 rmt Created
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* 02/17/2000 rmt Parameter validation work
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* 02/21/2000 rmt Updated to make core Unicode and remove ANSI calls
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*@@END_MSINTERNAL
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*
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***************************************************************************/
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#include "dnaddri.h"
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// # of slots to grow the cache at each opportunity
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#define STRINGCACHE_GROW_SLOTS 10
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#undef DPF_MODNAME
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#define DPF_MODNAME "CStringCache::CStringCache"
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CStringCache::CStringCache(): m_ppszStringCache(NULL), m_dwNumElements(0), m_dwNumSlots(0)
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{
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}
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#undef DPF_MODNAME
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#define DPF_MODNAME "CStringCache::~CStringCache"
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CStringCache::~CStringCache()
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{
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for( DWORD dwIndex = 0; dwIndex < m_dwNumElements; dwIndex++ )
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{
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delete [] m_ppszStringCache[dwIndex];
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}
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delete [] m_ppszStringCache;
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}
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#undef DPF_MODNAME
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#define DPF_MODNAME "CStringCache::AddString"
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HRESULT CStringCache::AddString( const WCHAR *pszString, WCHAR * *ppszSlot )
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{
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HRESULT hr;
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PWSTR pszSlot;
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hr = GetString( pszString, &pszSlot );
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if( hr != DPN_OK )
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{
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DPFX(DPFPREP, 0, "Internal Error hr=0x%x", hr );
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return hr;
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}
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// Entry was found
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if( pszSlot != NULL )
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{
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*ppszSlot = pszSlot;
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return DPN_OK;
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}
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else
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{
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if( m_dwNumElements == m_dwNumSlots )
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{
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hr = GrowCache( m_dwNumSlots + STRINGCACHE_GROW_SLOTS );
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if( FAILED( hr ) )
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{
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DPFX(DPFPREP, 0, "Failed to grow string cache hr=0x%x", hr );
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return hr;
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}
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}
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m_ppszStringCache[m_dwNumElements] = new WCHAR[wcslen(pszString)+1];
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if( m_ppszStringCache[m_dwNumElements] == NULL )
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{
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DPFX(DPFPREP, 0, "Failed to alloc mem" );
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return DPNERR_OUTOFMEMORY;
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}
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wcscpy( m_ppszStringCache[m_dwNumElements], pszString );
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*ppszSlot = m_ppszStringCache[m_dwNumElements];
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m_dwNumElements++;
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return DPN_OK;
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}
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}
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#undef DPF_MODNAME
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#define DPF_MODNAME "CStringCache::GetString"
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HRESULT CStringCache::GetString( const WCHAR *pszString, WCHAR * *ppszSlot )
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{
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*ppszSlot = NULL;
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for( DWORD dwIndex = 0; dwIndex < m_dwNumElements; dwIndex++ )
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{
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if( wcscmp( m_ppszStringCache[dwIndex], pszString ) == 0 )
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{
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*ppszSlot = m_ppszStringCache[dwIndex];
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return DPN_OK;
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}
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}
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return DPN_OK;
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}
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#undef DPF_MODNAME
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#define DPF_MODNAME "CStringCache::GrowCache"
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HRESULT CStringCache::GrowCache( DWORD dwNewSize )
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{
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WCHAR **ppszNewCache;
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ppszNewCache = new WCHAR *[dwNewSize];
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if( ppszNewCache == NULL )
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{
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DPFX(DPFPREP, 0, "Error allocating memory" );
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return DPNERR_OUTOFMEMORY;
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}
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memcpy( ppszNewCache, m_ppszStringCache, sizeof( WCHAR * ) * m_dwNumElements );
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m_dwNumSlots = dwNewSize;
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if( m_ppszStringCache != NULL )
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delete [] m_ppszStringCache;
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m_ppszStringCache = ppszNewCache;
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return DPN_OK;
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}
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