mirror of
https://github.com/reactos/reactos.git
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336 lines
9.4 KiB
C++
336 lines
9.4 KiB
C++
/*
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* ReactOS Explorer
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*
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* Copyright 2016 Sylvain Deverre <deverre dot sylv at gmail dot com>
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Wraps the component categories manager enum
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*/
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#include "shellbars.h"
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#define REGPATH L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Discardable\\PostSetup\\Component Categories"
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#define IMPLEMENTING L"Implementing"
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#define REQUIRING L"Requiring"
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typedef struct categoryCacheHeader
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{
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DWORD dwSize; // size of header only
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DWORD version; // currently 1
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SYSTEMTIME writeTime; // time we were written to registry
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DWORD classCount; // number of classes following
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} CATCACHEHDR, *PCATCACHEHDR;
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/*
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* This class manages a cached explorer component categories items, writing cache if it
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* doesn't exist yet.
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* It is used by CSHEnumClassesOfCategories internally.
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*/
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class CComCatCachedCategory
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{
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public:
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CComCatCachedCategory();
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virtual ~CComCatCachedCategory();
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HRESULT WriteCacheToDSA(HDSA pDest);
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HRESULT STDMETHODCALLTYPE Initialize(CATID &catID, BOOL reloadCache);
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private:
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BOOL LoadFromRegistry();
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HRESULT LoadFromComCatMgr();
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HRESULT CacheDSA();
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CATID fCategory;
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HDSA fLocalDsa;
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};
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CComCatCachedCategory::CComCatCachedCategory()
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{
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fLocalDsa = DSA_Create(sizeof(GUID), 5);
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}
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HRESULT STDMETHODCALLTYPE CComCatCachedCategory::Initialize(CATID &catID, BOOL reloadCache)
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{
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HRESULT hr;
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fCategory = catID;
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if (reloadCache || !LoadFromRegistry())
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{
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hr = LoadFromComCatMgr();
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if (FAILED_UNEXPECTEDLY(hr))
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return hr;
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hr = CacheDSA();
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if (FAILED_UNEXPECTEDLY(hr))
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return hr;
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}
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return S_OK;
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}
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CComCatCachedCategory::~CComCatCachedCategory()
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{
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DSA_Destroy(fLocalDsa);
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}
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BOOL CComCatCachedCategory::LoadFromRegistry()
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{
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WCHAR bufKey[MAX_PATH];
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WCHAR guidStr[MAX_PATH];
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DWORD dataSize, i;
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CComHeapPtr<CATCACHEHDR> buffer;
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GUID *guidArray;
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if (!fLocalDsa)
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return FALSE;
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dataSize = 0;
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if (!StringFromGUID2(fCategory, guidStr, MAX_PATH))
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return FALSE;
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wsprintf(bufKey, L"%s\\%s\\%s", REGPATH , guidStr, L"Enum");
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// Try to read key and get proper value size
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if (SHGetValue(HKEY_CURRENT_USER, bufKey, IMPLEMENTING, NULL, NULL, &dataSize))
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return FALSE;
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buffer.Attach((PCATCACHEHDR)CoTaskMemAlloc(dataSize));
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SHGetValue(HKEY_CURRENT_USER, bufKey, IMPLEMENTING, NULL, buffer, &dataSize);
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guidArray = (GUID*)(buffer + 1);
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for (i = 0; i < buffer->classCount; i++)
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{
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// Add class to cache
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DSA_InsertItem(fLocalDsa, DSA_APPEND, guidArray + i);
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}
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return TRUE;
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}
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HRESULT CComCatCachedCategory::CacheDSA()
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{
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WCHAR bufKey[MAX_PATH];
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WCHAR guidStr[MAX_PATH];
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UINT elemCount;
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UINT i;
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UINT bufferSize;
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CComHeapPtr<CATCACHEHDR> buffer;
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GUID *guidArray;
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GUID *tmp;
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elemCount = DSA_GetItemCount(fLocalDsa);
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bufferSize = sizeof(CATCACHEHDR) + elemCount * sizeof(GUID);
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if (!StringFromGUID2(fCategory, guidStr, MAX_PATH))
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return E_FAIL;
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buffer.Attach((PCATCACHEHDR)CoTaskMemAlloc(bufferSize));
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if (!buffer)
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return E_OUTOFMEMORY;
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// Correctly fill cache header
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buffer->dwSize = sizeof(CATCACHEHDR);
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buffer->version = 1;
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GetSystemTime(&buffer->writeTime);
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buffer->classCount = (DWORD)elemCount;
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guidArray = (GUID*)(buffer + 1);
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wsprintf(bufKey, L"%s\\%s\\%s", REGPATH , guidStr, L"Enum");
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// Write DSA contents inside the memory buffer allocated
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for(i = 0; i < elemCount; i++)
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{
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tmp = (GUID*)DSA_GetItemPtr(fLocalDsa, i);
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if (tmp)
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{
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guidArray[i] = *tmp;
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}
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}
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// Save items to registry
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SHSetValue(HKEY_CURRENT_USER, bufKey, IMPLEMENTING, REG_BINARY, buffer, bufferSize);
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guidArray = NULL;
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return S_OK;
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}
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HRESULT CComCatCachedCategory::LoadFromComCatMgr()
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{
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HRESULT hr;
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CComPtr<ICatInformation> pCatInformation;
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CComPtr<IEnumGUID> pEnumGUID;
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ULONG pFetched;
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CLSID tmp;
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// Get component categories manager instance
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hr = CoCreateInstance(CLSID_StdComponentCategoriesMgr, NULL, CLSCTX_INPROC_SERVER,
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IID_PPV_ARG(ICatInformation, &pCatInformation));
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if (FAILED_UNEXPECTEDLY(hr))
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return hr;
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// Get the proper enumerator
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hr = pCatInformation->EnumClassesOfCategories(1, &fCategory, NULL, NULL, &pEnumGUID);
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if (FAILED_UNEXPECTEDLY(hr))
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return hr;
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// Enumerate elements
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do
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{
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pFetched = 0;
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pEnumGUID->Next(1, &tmp, &pFetched);
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if (pFetched)
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{
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if (DSA_InsertItem(fLocalDsa, DSA_APPEND, &tmp) == E_OUTOFMEMORY)
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return E_OUTOFMEMORY;
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}
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}
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while (pFetched > 0);
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return S_OK;
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}
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HRESULT CComCatCachedCategory::WriteCacheToDSA(HDSA pDest)
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{
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INT i;
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for(i = 0; i < DSA_GetItemCount(fLocalDsa); i++)
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{
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if (DSA_InsertItem(pDest, DSA_APPEND, DSA_GetItemPtr(fLocalDsa, i)) == DSA_ERR)
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return E_OUTOFMEMORY;
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}
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return S_OK;
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}
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class CSHEnumClassesOfCategories :
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public CComCoClass<CSHEnumClassesOfCategories>,
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public CComObjectRootEx<CComMultiThreadModelNoCS>,
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public IEnumGUID
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{
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private:
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CComPtr<ICatInformation> fCatInformation;
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HDSA fDsa;
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ULONG fCursor;
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public:
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CSHEnumClassesOfCategories();
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virtual ~CSHEnumClassesOfCategories();
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virtual HRESULT STDMETHODCALLTYPE Initialize(ULONG cImplemented, CATID *pImplemented, ULONG cRequired, CATID *pRequired);
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// *** IEnumGUID methods ***
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virtual HRESULT STDMETHODCALLTYPE Clone(IEnumCLSID **ppvOut);
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virtual HRESULT STDMETHODCALLTYPE Next(ULONG cElt, CLSID *pElts, ULONG *pFetched);
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virtual HRESULT STDMETHODCALLTYPE Reset();
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virtual HRESULT STDMETHODCALLTYPE Skip(ULONG nbElts);
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BEGIN_COM_MAP(CSHEnumClassesOfCategories)
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COM_INTERFACE_ENTRY_IID(IID_IEnumGUID, IEnumGUID)
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END_COM_MAP()
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};
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CSHEnumClassesOfCategories::CSHEnumClassesOfCategories()
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{
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fCursor = 0;
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fDsa = DSA_Create(sizeof(GUID), 5);
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}
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CSHEnumClassesOfCategories::~CSHEnumClassesOfCategories()
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{
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if (fDsa)
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DSA_Destroy(fDsa);
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}
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HRESULT CSHEnumClassesOfCategories::Initialize(ULONG cImplemented, CATID *pImplemented, ULONG cRequired, CATID *pRequired)
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{
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UINT i;
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HRESULT hr;
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if (!fDsa)
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return E_FAIL;
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if (cRequired > 0 || cImplemented == (ULONG)-1)
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{
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FIXME("Implement required categories class enumeration\n");
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return E_NOTIMPL;
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}
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// Don't do anything if we have nothing
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if (cRequired == 0 && cImplemented == (ULONG)-1)
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return E_FAIL;
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// For each implemented category, create a cache and add it to our local DSA
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for (i = 0; i < cImplemented; i++)
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{
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CComCatCachedCategory cachedCat;
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hr = cachedCat.Initialize(pImplemented[i], FALSE);
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if (FAILED_UNEXPECTEDLY(hr))
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return hr;
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cachedCat.WriteCacheToDSA(fDsa);
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}
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return S_OK;
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}
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// *** IEnumGUID methods ***
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HRESULT STDMETHODCALLTYPE CSHEnumClassesOfCategories::Clone(IEnumCLSID **ppvOut)
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{
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return E_NOTIMPL;
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}
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HRESULT STDMETHODCALLTYPE CSHEnumClassesOfCategories::Next(ULONG cElt, CLSID *pElts, ULONG *pFetched)
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{
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ULONG i;
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ULONG read;
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GUID *tmp;
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if (!pElts)
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return E_INVALIDARG;
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read = 0;
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for (i = 0; i < cElt && (fCursor < (ULONG)DSA_GetItemCount(fDsa)); i++)
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{
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tmp = (GUID*)DSA_GetItemPtr(fDsa, fCursor + i);
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if (!tmp)
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break;
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pElts[i] = *tmp;
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read++;
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}
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fCursor += read;
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if (pFetched)
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*pFetched = read;
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return S_OK;
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}
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HRESULT STDMETHODCALLTYPE CSHEnumClassesOfCategories::Reset()
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{
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fCursor = 0;
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return S_OK;
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}
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HRESULT STDMETHODCALLTYPE CSHEnumClassesOfCategories::Skip(ULONG nbElts)
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{
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if (fCursor + nbElts >= (ULONG)DSA_GetItemCount(fDsa))
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return E_INVALIDARG;
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fCursor += nbElts;
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return S_OK;
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}
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/*************************************************************************
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* SHEnumClassesOfCategories [BROWSEUI.136]
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*/
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extern "C" HRESULT WINAPI SHEnumClassesOfCategories(ULONG cImplemented, CATID *pImplemented, ULONG cRequired, CATID *pRequired, IEnumGUID **out)
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{
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HRESULT hr;
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hr = ShellObjectCreatorInit<CSHEnumClassesOfCategories>(
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cImplemented, pImplemented, cRequired, pRequired, IID_PPV_ARG(IEnumGUID, out));
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if (FAILED_UNEXPECTEDLY(hr))
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return hr;
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return S_OK;
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}
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