mirror of
https://github.com/reactos/reactos.git
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236 lines
5.2 KiB
C++
236 lines
5.2 KiB
C++
/*
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* IEnumIDList
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*
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* Copyright 1998 Juergen Schmied <juergen.schmied@metronet.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "precomp.h"
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WINE_DEFAULT_DEBUG_CHANNEL(shell);
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CEnumIDListBase::CEnumIDListBase() :
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mpFirst(NULL),
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mpLast(NULL),
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mpCurrent(NULL)
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{
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}
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CEnumIDListBase::~CEnumIDListBase()
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{
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DeleteList();
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}
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/**************************************************************************
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* AddToEnumList()
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*/
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BOOL CEnumIDListBase::AddToEnumList(LPITEMIDLIST pidl)
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{
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ENUMLIST *pNew;
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TRACE("(%p)->(pidl=%p)\n", this, pidl);
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if (!pidl)
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return FALSE;
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pNew = static_cast<ENUMLIST *>(SHAlloc(sizeof(ENUMLIST)));
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if (pNew)
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{
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/*set the next pointer */
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pNew->pNext = NULL;
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pNew->pidl = pidl;
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/*is This the first item in the list? */
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if (!mpFirst)
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{
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mpFirst = pNew;
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mpCurrent = pNew;
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}
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if (mpLast)
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{
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/*add the new item to the end of the list */
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mpLast->pNext = pNew;
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}
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/*update the last item pointer */
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mpLast = pNew;
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TRACE("-- (%p)->(first=%p, last=%p)\n", this, mpFirst, mpLast);
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return TRUE;
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}
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return FALSE;
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}
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/**************************************************************************
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* DeleteList()
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*/
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BOOL CEnumIDListBase::DeleteList()
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{
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ENUMLIST *pDelete;
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TRACE("(%p)->()\n", this);
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while (mpFirst)
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{
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pDelete = mpFirst;
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mpFirst = pDelete->pNext;
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SHFree(pDelete->pidl);
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SHFree(pDelete);
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}
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mpFirst = NULL;
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mpLast = NULL;
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mpCurrent = NULL;
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return TRUE;
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}
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/**************************************************************************
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* HasItemWithCLSID()
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*/
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BOOL CEnumIDListBase::HasItemWithCLSID(LPITEMIDLIST pidl)
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{
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ENUMLIST *pCur;
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IID *ptr = _ILGetGUIDPointer(pidl);
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if (ptr)
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{
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REFIID refid = *ptr;
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pCur = mpFirst;
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while(pCur)
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{
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LPGUID curid = _ILGetGUIDPointer(pCur->pidl);
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if (curid && IsEqualGUID(*curid, refid))
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{
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return TRUE;
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}
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pCur = pCur->pNext;
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}
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}
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return FALSE;
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}
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HRESULT CEnumIDListBase::AppendItemsFromEnumerator(IEnumIDList* pEnum)
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{
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LPITEMIDLIST pidl;
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DWORD dwFetched;
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if (!pEnum)
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return E_INVALIDARG;
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pEnum->Reset();
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while((S_OK == pEnum->Next(1, &pidl, &dwFetched)) && dwFetched)
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AddToEnumList(pidl);
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return S_OK;
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}
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/**************************************************************************
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* IEnumIDList_fnNext
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*/
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HRESULT WINAPI CEnumIDListBase::Next(
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ULONG celt,
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LPITEMIDLIST * rgelt,
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ULONG *pceltFetched)
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{
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ULONG i;
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HRESULT hr = S_OK;
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LPITEMIDLIST temp;
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TRACE("(%p)->(%d,%p, %p)\n", this, celt, rgelt, pceltFetched);
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/* It is valid to leave pceltFetched NULL when celt is 1. Some of explorer's
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* subsystems actually use it (and so may a third party browser)
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*/
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if(pceltFetched)
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*pceltFetched = 0;
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*rgelt=0;
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if(celt > 1 && !pceltFetched)
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{ return E_INVALIDARG;
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}
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if(celt > 0 && !mpCurrent)
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{ return S_FALSE;
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}
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for(i = 0; i < celt; i++)
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{ if(!mpCurrent)
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break;
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temp = ILClone(mpCurrent->pidl);
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rgelt[i] = temp;
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mpCurrent = mpCurrent->pNext;
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}
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if(pceltFetched)
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{ *pceltFetched = i;
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}
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return hr;
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}
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/**************************************************************************
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* IEnumIDList_fnSkip
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*/
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HRESULT WINAPI CEnumIDListBase::Skip(
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ULONG celt)
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{
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DWORD dwIndex;
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HRESULT hr = S_OK;
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TRACE("(%p)->(%u)\n", this, celt);
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for(dwIndex = 0; dwIndex < celt; dwIndex++)
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{ if(!mpCurrent)
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{ hr = S_FALSE;
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break;
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}
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mpCurrent = mpCurrent->pNext;
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}
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return hr;
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}
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/**************************************************************************
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* IEnumIDList_fnReset
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*/
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HRESULT WINAPI CEnumIDListBase::Reset()
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{
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TRACE("(%p)\n", this);
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mpCurrent = mpFirst;
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return S_OK;
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}
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/**************************************************************************
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* IEnumIDList_fnClone
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*/
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HRESULT WINAPI CEnumIDListBase::Clone(LPENUMIDLIST *ppenum)
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{
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TRACE("(%p)->() to (%p)->() E_NOTIMPL\n", this, ppenum);
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return E_NOTIMPL;
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}
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/**************************************************************************
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* IEnumIDList_Folder_Constructor
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*
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*/
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HRESULT IEnumIDList_Constructor(IEnumIDList **enumerator)
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{
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return ShellObjectCreator<CEnumIDListBase>(IID_PPV_ARG(IEnumIDList, enumerator));
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}
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