454 lines
8.3 KiB
C++
454 lines
8.3 KiB
C++
//****************************************************************************
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// Module: NMCHAT.EXE
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// File: CLUTIL.CPP
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// Content:
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//
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//
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// Copyright (c) Microsoft Corporation 1997
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//
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
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// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
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// PARTICULAR PURPOSE.
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//****************************************************************************
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#include "precomp.h"
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///////////////////////////////////////////////////////////////////////////
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// RefCount
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/* R E F C O U N T */
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/*-------------------------------------------------------------------------
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%%Function: RefCount
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-------------------------------------------------------------------------*/
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RefCount::RefCount(void)
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{
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m_cRef = 1;
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}
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RefCount::~RefCount(void)
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{
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}
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ULONG STDMETHODCALLTYPE RefCount::AddRef(void)
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{
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ASSERT(m_cRef >= 0);
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InterlockedIncrement(&m_cRef);
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return (ULONG) m_cRef;
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}
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ULONG STDMETHODCALLTYPE RefCount::Release(void)
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{
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if (0 == InterlockedDecrement(&m_cRef))
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{
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delete this;
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return 0;
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}
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ASSERT(m_cRef > 0);
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return (ULONG) m_cRef;
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}
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///////////////////////////////////////////////////////////////////////////
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// CNotify
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/* C N O T I F Y */
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/*-------------------------------------------------------------------------
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%%Function: CNotify
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-------------------------------------------------------------------------*/
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CNotify::CNotify() :
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m_pcnpcnt(NULL),
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m_pcnp(NULL),
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m_dwCookie(0),
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m_pUnk(NULL)
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{
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}
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CNotify::~CNotify()
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{
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Disconnect(); // Make sure we're disconnected
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}
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/* C O N N E C T */
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/*-------------------------------------------------------------------------
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%%Function: Connect
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-------------------------------------------------------------------------*/
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HRESULT CNotify::Connect(IUnknown *pUnk, REFIID riid, IUnknown *pUnkN)
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{
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HRESULT hr;
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ASSERT(0 == m_dwCookie);
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// Get the connection container
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hr = pUnk->QueryInterface(IID_IConnectionPointContainer, (void **)&m_pcnpcnt);
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if (SUCCEEDED(hr))
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{
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// Find an appropriate connection point
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hr = m_pcnpcnt->FindConnectionPoint(riid, &m_pcnp);
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if (SUCCEEDED(hr))
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{
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ASSERT(NULL != m_pcnp);
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// Connect the sink object
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hr = m_pcnp->Advise((IUnknown *)pUnkN, &m_dwCookie);
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}
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}
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if (FAILED(hr))
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{
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ERROR_OUT(("MNMSRVC: CNotify::Connect failed: %x", hr));
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m_dwCookie = 0;
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}
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else
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{
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m_pUnk = pUnk; // keep around for caller
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}
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return hr;
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}
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/* D I S C O N N E C T */
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/*-------------------------------------------------------------------------
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%%Function: Disconnect
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-------------------------------------------------------------------------*/
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HRESULT CNotify::Disconnect (void)
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{
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if (0 != m_dwCookie)
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{
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// Disconnect the sink object
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m_pcnp->Unadvise(m_dwCookie);
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m_dwCookie = 0;
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m_pcnp->Release();
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m_pcnp = NULL;
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m_pcnpcnt->Release();
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m_pcnpcnt = NULL;
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m_pUnk = NULL;
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}
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return S_OK;
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}
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///////////////////////////////////////////////////////////////////////////
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// COBLIST
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COBLIST::~COBLIST()
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{
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ASSERT(IsEmpty());
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}
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#ifdef DEBUG
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VOID* COBLIST::GetHead()
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{
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ASSERT(m_pHead);
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return m_pHead->pItem;
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}
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VOID* COBLIST::GetTail()
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{
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ASSERT(m_pTail);
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return m_pTail->pItem;
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}
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#endif /* DEBUG */
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VOID* COBLIST::GetNext(POSITION& rPos)
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{
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ASSERT(rPos);
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VOID* pReturn = rPos->pItem;
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rPos = rPos->pNext;
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return pReturn;
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}
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VOID* COBLIST::RemoveAt(POSITION Pos)
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{
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VOID* pReturn = NULL;
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if (m_pHead)
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{
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if (m_pHead == Pos)
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{
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// Removing the first element in the list
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m_pHead = Pos->pNext;
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pReturn = Pos->pItem;
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delete Pos;
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m_cItem--;
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ASSERT(0 <= m_cItem);
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if (NULL == m_pHead)
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{
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// Removing the only element!
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m_pTail = NULL;
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}
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}
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else
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{
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POSITION pCur = m_pHead;
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while (pCur && pCur->pNext)
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{
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if (pCur->pNext == Pos)
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{
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// Removing
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pCur->pNext = Pos->pNext;
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if (m_pTail == Pos)
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{
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m_pTail = pCur;
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}
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pReturn = Pos->pItem;
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delete Pos;
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m_cItem--;
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ASSERT(0 <= m_cItem);
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}
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pCur = pCur->pNext;
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}
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}
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}
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return pReturn;
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}
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POSITION COBLIST::AddTail(VOID* pItem)
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{
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POSITION posRet = NULL;
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if (m_pTail)
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{
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if (m_pTail->pNext = new COBNODE)
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{
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m_pTail = m_pTail->pNext;
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m_pTail->pItem = pItem;
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m_pTail->pNext = NULL;
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m_cItem++;
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}
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}
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else
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{
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ASSERT(!m_pHead);
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if (m_pHead = new COBNODE)
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{
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m_pTail = m_pHead;
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m_pTail->pItem = pItem;
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m_pTail->pNext = NULL;
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m_cItem++;
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}
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}
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return m_pTail;
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}
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void COBLIST::EmptyList()
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{
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while (!IsEmpty()) {
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RemoveAt(GetHeadPosition());
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}
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}
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#ifdef DEBUG
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VOID* COBLIST::RemoveTail()
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{
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ASSERT(m_pHead);
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ASSERT(m_pTail);
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return RemoveAt(m_pTail);
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}
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VOID* COBLIST::RemoveHead()
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{
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ASSERT(m_pHead);
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ASSERT(m_pTail);
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return RemoveAt(m_pHead);
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}
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void * COBLIST::GetFromPosition(POSITION Pos)
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{
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void * Result = SafeGetFromPosition(Pos);
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ASSERT(Result);
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return Result;
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}
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#endif /* DEBUG */
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POSITION COBLIST::GetPosition(void* _pItem)
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{
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POSITION Position = m_pHead;
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while (Position) {
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if (Position->pItem == _pItem) {
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break;
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}
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GetNext(Position);
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}
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return Position;
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}
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POSITION COBLIST::Lookup(void* pComparator)
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{
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POSITION Position = m_pHead;
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while (Position) {
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if (Compare(Position->pItem, pComparator)) {
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break;
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}
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GetNext(Position);
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}
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return Position;
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}
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void * COBLIST::SafeGetFromPosition(POSITION Pos)
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{
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// Safe way to validate that an entry is still in the list,
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// which ensures bugs that would reference deleted memory,
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// reference a NULL pointer instead
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// (e.g. an event handler fires late/twice).
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// Note that versioning on entries would provide an additional
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// safeguard against re-use of a position.
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// Walk list to find entry.
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POSITION PosWork = m_pHead;
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while (PosWork) {
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if (PosWork == Pos) {
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return Pos->pItem;
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}
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GetNext(PosWork);
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}
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return NULL;
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}
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/////////////////////////////
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// COBLIST Utility routines
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/* A D D N O D E */
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/*-------------------------------------------------------------------------
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%%Function: AddNode
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Add a node to a list.
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Initializes the ObList, if necessary.
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Returns the position in the list or NULL if there was a problem.
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-------------------------------------------------------------------------*/
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POSITION AddNode(PVOID pv, COBLIST ** ppList)
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{
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ASSERT(NULL != ppList);
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if (NULL == *ppList)
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{
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*ppList = new COBLIST();
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if (NULL == *ppList)
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return NULL;
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}
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return (*ppList)->AddTail(pv);
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}
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/* R E M O V E N O D E */
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/*-------------------------------------------------------------------------
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%%Function: RemoveNode
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Remove a node from a list.
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Sets pPos to NULL
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-------------------------------------------------------------------------*/
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PVOID RemoveNode(POSITION * pPos, COBLIST *pList)
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{
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if ((NULL == pList) || (NULL == pPos))
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return NULL;
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PVOID pv = pList->RemoveAt(*pPos);
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*pPos = NULL;
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return pv;
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}
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////////////////////////////////////////////////////////////////////////////
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// BSTRING
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// We don't support construction from an ANSI string in the Unicode build.
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#if !defined(UNICODE)
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BSTRING::BSTRING(LPCSTR lpcString)
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{
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m_bstr = NULL;
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// Compute the length of the required BSTR, including the null
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int cWC = MultiByteToWideChar(CP_ACP, 0, lpcString, -1, NULL, 0);
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if (cWC <= 0)
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return;
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// Allocate the BSTR, including the null
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m_bstr = SysAllocStringLen(NULL, cWC - 1); // SysAllocStringLen adds another 1
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ASSERT(NULL != m_bstr);
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if (NULL == m_bstr)
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{
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return;
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}
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// Copy the string
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MultiByteToWideChar(CP_ACP, 0, lpcString, -1, (LPWSTR) m_bstr, cWC);
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// Verify that the string is null terminated
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ASSERT(0 == m_bstr[cWC - 1]);
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}
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#endif // !defined(UNICODE)
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///////////////////////////
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// BTSTR
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BTSTR::BTSTR(BSTR bstr)
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{
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m_psz = PszFromBstr(bstr);
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}
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BTSTR::~BTSTR()
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{
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if (NULL != m_psz)
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LocalFree(m_psz);
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}
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LPTSTR PszFromBstr(BSTR bstr)
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{
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if (NULL == bstr)
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return NULL;
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int cch = WideCharToMultiByte(CP_ACP, 0, (LPWSTR)bstr, -1, NULL, 0, NULL, NULL);
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if (cch <= 0)
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return NULL;
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LPTSTR psz = (LPTSTR)LocalAlloc(LMEM_FIXED, sizeof(TCHAR) * (cch+1) );
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if (NULL == psz)
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return NULL;
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WideCharToMultiByte(CP_ACP, 0, (LPWSTR)bstr, -1, psz, cch+1, NULL, NULL);
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return psz;
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}
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