comcat.c

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/*
 * Comcat implementation
 *
 * Copyright (C) 2002 John K. Hohm
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#include <string.h>
#include <stdarg.h>
 
#define COBJMACROS
 
#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "winreg.h"
#include "winerror.h"
 
#include "ole2.h"
#include "comcat.h"
#include "compobj_private.h"
 
#include "wine/debug.h"
 
WINE_DEFAULT_DEBUG_CHANNEL(ole);
 
static const ICatRegisterVtbl COMCAT_ICatRegister_Vtbl;
static const ICatInformationVtbl COMCAT_ICatInformation_Vtbl;
 
typedef struct
{
    ICatRegister ICatRegister_iface;
    ICatInformation ICatInformation_iface;
} ComCatMgrImpl;
 
/* static ComCatMgr instance */
static ComCatMgrImpl COMCAT_ComCatMgr =
{
    { &COMCAT_ICatRegister_Vtbl },
    { &COMCAT_ICatInformation_Vtbl }
};
 
struct class_categories
{
    ULONG   size;        /* total length, including structure itself */
    ULONG   impl_offset;
    ULONG   req_offset;
};
 
static HRESULT EnumCATEGORYINFO_Construct(LCID lcid, IEnumCATEGORYINFO **ret);
static HRESULT CLSIDEnumGUID_Construct(struct class_categories *class_categories, IEnumCLSID **ret);
static HRESULT CATIDEnumGUID_Construct(REFCLSID rclsid, LPCWSTR impl_req, IEnumCATID **ret);
 
/**********************************************************************
 * File-scope string constants
 */
static const WCHAR comcat_keyname[] = L"Component Categories";
static const WCHAR impl_keyname[] = L"Implemented Categories";
static const WCHAR req_keyname[] = L"Required Categories";
 
/**********************************************************************
 * COMCAT_RegisterClassCategories
 */
static HRESULT COMCAT_RegisterClassCategories(
    REFCLSID rclsid,
    LPCWSTR type,
    ULONG cCategories,
    const CATID *rgcatid)
{
    WCHAR keyname[CHARS_IN_GUID];
    HRESULT res;
    HKEY clsid_key, class_key, type_key;
 
    if (cCategories && rgcatid == NULL) return E_POINTER;
 
    /* Format the class key name. */
    res = StringFromGUID2(rclsid, keyname, CHARS_IN_GUID);
    if (FAILED(res)) return res;
 
    /* Create (or open) the CLSID key. */
    res = create_classes_key(HKEY_CLASSES_ROOT, L"CLSID", KEY_READ|KEY_WRITE, &clsid_key);
    if (res != ERROR_SUCCESS) return E_FAIL;
 
    /* Create (or open) the class key. */
    res = create_classes_key(clsid_key, keyname, KEY_READ|KEY_WRITE, &class_key);
    if (res == ERROR_SUCCESS) {
    /* Create (or open) the category type key. */
    res = create_classes_key(class_key, type, KEY_READ|KEY_WRITE, &type_key);
    if (res == ERROR_SUCCESS) {
        for (; cCategories; --cCategories, ++rgcatid) {
        HKEY key;
 
        /* Format the category key name. */
        res = StringFromGUID2(rgcatid, keyname, CHARS_IN_GUID);
        if (FAILED(res)) continue;
 
        /* Do the register. */
        res = create_classes_key(type_key, keyname, KEY_READ|KEY_WRITE, &key);
        if (res == ERROR_SUCCESS) RegCloseKey(key);
        }
        res = S_OK;
    } else res = E_FAIL;
    RegCloseKey(class_key);
    } else res = E_FAIL;
    RegCloseKey(clsid_key);
 
    return res;
}
 
/**********************************************************************
 * COMCAT_UnRegisterClassCategories
 */
static HRESULT COMCAT_UnRegisterClassCategories(
    REFCLSID rclsid,
    LPCWSTR type,
    ULONG cCategories,
    const CATID *rgcatid)
{
    WCHAR keyname[68] = L"CLSID\\";
    HRESULT res;
    HKEY type_key;
 
    if (cCategories && rgcatid == NULL) return E_POINTER;
 
    /* Format the class category type key name. */
    res = StringFromGUID2(rclsid, keyname + 6, CHARS_IN_GUID);
    if (FAILED(res)) return res;
    keyname[44] = '\\';
    lstrcpyW(keyname + 45, type);
 
    /* Open the class category type key. */
    res = open_classes_key(HKEY_CLASSES_ROOT, keyname, KEY_READ|KEY_WRITE, &type_key);
    if (res != ERROR_SUCCESS) return E_FAIL;
 
    for (; cCategories; --cCategories, ++rgcatid) {
    /* Format the category key name. */
    res = StringFromGUID2(rgcatid, keyname, CHARS_IN_GUID);
    if (FAILED(res)) continue;
 
    /* Do the unregister. */
    RegDeleteKeyW(type_key, keyname);
    }
    RegCloseKey(type_key);
 
    return S_OK;
}
 
/**********************************************************************
 * COMCAT_GetCategoryDesc
 */
static HRESULT COMCAT_GetCategoryDesc(HKEY key, LCID lcid, PWCHAR pszDesc,
                      ULONG buf_wchars)
{
    WCHAR valname[5];
    HRESULT res;
    DWORD type, size = (buf_wchars - 1) * sizeof(WCHAR);
 
    if (pszDesc == NULL) return E_INVALIDARG;
 
    /* FIXME: lcid comparisons are more complex than this! */
    wsprintfW(valname, L"%lX", lcid);
    res = RegQueryValueExW(key, valname, 0, &type, (LPBYTE)pszDesc, &size);
    if (res != ERROR_SUCCESS || type != REG_SZ) {
    FIXME("Simplified lcid comparison\n");
    return CAT_E_NODESCRIPTION;
    }
    pszDesc[size / sizeof(WCHAR)] = 0;
 
    return S_OK;
}
 
/**********************************************************************
 * COMCAT_PrepareClassCategories
 */
static struct class_categories *COMCAT_PrepareClassCategories(
    ULONG impl_count, const CATID *impl_catids, ULONG req_count, const CATID *req_catids)
{
    struct class_categories *categories;
    WCHAR *strings;
    ULONG size;
 
    size = sizeof(struct class_categories) + ((impl_count + req_count)*CHARS_IN_GUID + 2)*sizeof(WCHAR);
    categories = HeapAlloc(GetProcessHeap(), 0, size);
    if (categories == NULL) return categories;
 
    categories->size = size;
    categories->impl_offset = sizeof(struct class_categories);
    categories->req_offset = categories->impl_offset + (impl_count*CHARS_IN_GUID + 1)*sizeof(WCHAR);
 
    strings = (WCHAR *)(categories + 1);
    while (impl_count--) {
    StringFromGUID2(impl_catids++, strings, CHARS_IN_GUID);
    strings += CHARS_IN_GUID;
    }
    *strings++ = 0;
 
    while (req_count--) {
    StringFromGUID2(req_catids++, strings, CHARS_IN_GUID);
    strings += CHARS_IN_GUID;
    }
    *strings++ = 0;
 
    return categories;
}
 
/**********************************************************************
 * COMCAT_IsClassOfCategories
 */
static HRESULT COMCAT_IsClassOfCategories(
    HKEY key,
    struct class_categories const* categories)
{
    const WCHAR *impl_strings, *req_strings;
    HKEY subkey;
    HRESULT res;
    DWORD index;
    LPCWSTR string;
 
    impl_strings = (WCHAR*)((BYTE*)categories + categories->impl_offset);
    req_strings  = (WCHAR*)((BYTE*)categories + categories->req_offset);
 
    /* Check that every given category is implemented by class. */
    if (*impl_strings) {
    res = open_classes_key(key, impl_keyname, KEY_READ, &subkey);
    if (res != ERROR_SUCCESS) return S_FALSE;
    for (string = impl_strings; *string; string += CHARS_IN_GUID) {
        HKEY catkey;
        res = open_classes_key(subkey, string, READ_CONTROL, &catkey);
        if (res != ERROR_SUCCESS) {
        RegCloseKey(subkey);
        return S_FALSE;
        }
        RegCloseKey(catkey);
    }
    RegCloseKey(subkey);
    }
 
    /* Check that all categories required by class are given. */
    res = open_classes_key(key, req_keyname, KEY_READ, &subkey);
    if (res == ERROR_SUCCESS) {
    for (index = 0; ; ++index) {
        WCHAR keyname[CHARS_IN_GUID];
        DWORD size = CHARS_IN_GUID;
 
        res = RegEnumKeyExW(subkey, index, keyname, &size,
                NULL, NULL, NULL, NULL);
        if (res != ERROR_SUCCESS && res != ERROR_MORE_DATA) break;
        if (size != CHARS_IN_GUID-1) continue; /* bogus catid in registry */
        for (string = req_strings; *string; string += CHARS_IN_GUID)
        if (!wcsicmp(string, keyname)) break;
        if (!*string) {
        RegCloseKey(subkey);
        return S_FALSE;
        }
    }
    RegCloseKey(subkey);
    }
 
    return S_OK;
}
 
/**********************************************************************
 * COMCAT_ICatRegister_QueryInterface
 */
static HRESULT WINAPI COMCAT_ICatRegister_QueryInterface(
    LPCATREGISTER iface,
    REFIID riid,
    LPVOID *ppvObj)
{
    TRACE("%s\n",debugstr_guid(riid));
 
    if (ppvObj == NULL) return E_POINTER;
 
    if (IsEqualGUID(riid, &IID_IUnknown) || IsEqualGUID(riid, &IID_ICatRegister)) {
    *ppvObj = iface;
        ICatRegister_AddRef(iface);
    return S_OK;
    }
 
    if (IsEqualGUID(riid, &IID_ICatInformation)) {
        *ppvObj = &COMCAT_ComCatMgr.ICatInformation_iface;
        ICatRegister_AddRef(iface);
    return S_OK;
    }
 
    return E_NOINTERFACE;
}
 
/**********************************************************************
 * COMCAT_ICatRegister_AddRef
 */
static ULONG WINAPI COMCAT_ICatRegister_AddRef(LPCATREGISTER iface)
{
    return 2; /* non-heap based object */
}
 
/**********************************************************************
 * COMCAT_ICatRegister_Release
 */
static ULONG WINAPI COMCAT_ICatRegister_Release(LPCATREGISTER iface)
{
    return 1; /* non-heap based object */
}
 
/**********************************************************************
 * COMCAT_ICatRegister_RegisterCategories
 */
static HRESULT WINAPI COMCAT_ICatRegister_RegisterCategories(
    LPCATREGISTER iface,
    ULONG cCategories,
    CATEGORYINFO *rgci)
{
    HKEY comcat_key;
    HRESULT res;
 
    TRACE("\n");
 
    if (cCategories && rgci == NULL)
    return E_POINTER;
 
    /* Create (or open) the component categories key. */
    res = create_classes_key(HKEY_CLASSES_ROOT, comcat_keyname, KEY_READ|KEY_WRITE, &comcat_key);
    if (res != ERROR_SUCCESS) return E_FAIL;
 
    for (; cCategories; --cCategories, ++rgci)
    {
    WCHAR keyname[CHARS_IN_GUID];
    WCHAR valname[9];
    HKEY cat_key;
 
    /* Create (or open) the key for this category. */
    if (!StringFromGUID2(&rgci->catid, keyname, CHARS_IN_GUID)) continue;
    res = create_classes_key(comcat_key, keyname, KEY_READ|KEY_WRITE, &cat_key);
    if (res != ERROR_SUCCESS) continue;
 
    /* Set the value for this locale's description. */
    wsprintfW(valname, L"%lX", rgci->lcid);
        RegSetValueExW(cat_key, valname, 0, REG_SZ, (const BYTE*)rgci->szDescription,
               (lstrlenW(rgci->szDescription) + 1) * sizeof(WCHAR));
 
    RegCloseKey(cat_key);
    }
 
    RegCloseKey(comcat_key);
    return S_OK;
}
 
/**********************************************************************
 * COMCAT_ICatRegister_UnRegisterCategories
 */
static HRESULT WINAPI COMCAT_ICatRegister_UnRegisterCategories(
    LPCATREGISTER iface,
    ULONG cCategories,
    CATID *rgcatid)
{
    HKEY comcat_key;
    HRESULT res;
 
    TRACE("\n");
 
    if (cCategories && rgcatid == NULL)
    return E_POINTER;
 
    /* Open the component categories key. */
    res = open_classes_key(HKEY_CLASSES_ROOT, comcat_keyname, KEY_READ|KEY_WRITE, &comcat_key);
    if (res != ERROR_SUCCESS) return E_FAIL;
 
    for (; cCategories; --cCategories, ++rgcatid) {
    WCHAR keyname[CHARS_IN_GUID];
 
    /* Delete the key for this category. */
    if (!StringFromGUID2(rgcatid, keyname, CHARS_IN_GUID)) continue;
    RegDeleteKeyW(comcat_key, keyname);
    }
 
    RegCloseKey(comcat_key);
    return S_OK;
}
 
/**********************************************************************
 * COMCAT_ICatRegister_RegisterClassImplCategories
 */
static HRESULT WINAPI COMCAT_ICatRegister_RegisterClassImplCategories(
    LPCATREGISTER iface,
    REFCLSID rclsid,
    ULONG cCategories,
    CATID *rgcatid)
{
    TRACE("\n");
 
    return COMCAT_RegisterClassCategories(
    rclsid, impl_keyname, cCategories, rgcatid);
}
 
/**********************************************************************
 * COMCAT_ICatRegister_UnRegisterClassImplCategories
 */
static HRESULT WINAPI COMCAT_ICatRegister_UnRegisterClassImplCategories(
    LPCATREGISTER iface,
    REFCLSID rclsid,
    ULONG cCategories,
    CATID *rgcatid)
{
    TRACE("\n");
 
    return COMCAT_UnRegisterClassCategories(
    rclsid, impl_keyname, cCategories, rgcatid);
}
 
/**********************************************************************
 * COMCAT_ICatRegister_RegisterClassReqCategories
 */
static HRESULT WINAPI COMCAT_ICatRegister_RegisterClassReqCategories(
    LPCATREGISTER iface,
    REFCLSID rclsid,
    ULONG cCategories,
    CATID *rgcatid)
{
    TRACE("\n");
 
    return COMCAT_RegisterClassCategories(
    rclsid, req_keyname, cCategories, rgcatid);
}
 
/**********************************************************************
 * COMCAT_ICatRegister_UnRegisterClassReqCategories
 */
static HRESULT WINAPI COMCAT_ICatRegister_UnRegisterClassReqCategories(
    LPCATREGISTER iface,
    REFCLSID rclsid,
    ULONG cCategories,
    CATID *rgcatid)
{
    TRACE("\n");
 
    return COMCAT_UnRegisterClassCategories(
    rclsid, req_keyname, cCategories, rgcatid);
}
 
/**********************************************************************
 * COMCAT_ICatInformation_QueryInterface
 */
static HRESULT WINAPI COMCAT_ICatInformation_QueryInterface(
    LPCATINFORMATION iface,
    REFIID riid,
    LPVOID *ppvObj)
{
    return ICatRegister_QueryInterface(&COMCAT_ComCatMgr.ICatRegister_iface, riid, ppvObj);
}
 
/**********************************************************************
 * COMCAT_ICatInformation_AddRef
 */
static ULONG WINAPI COMCAT_ICatInformation_AddRef(LPCATINFORMATION iface)
{
    return ICatRegister_AddRef(&COMCAT_ComCatMgr.ICatRegister_iface);
}
 
/**********************************************************************
 * COMCAT_ICatInformation_Release
 */
static ULONG WINAPI COMCAT_ICatInformation_Release(LPCATINFORMATION iface)
{
    return ICatRegister_Release(&COMCAT_ComCatMgr.ICatRegister_iface);
}
 
/**********************************************************************
 * COMCAT_ICatInformation_EnumCategories
 */
static HRESULT WINAPI COMCAT_ICatInformation_EnumCategories(
    LPCATINFORMATION iface,
    LCID lcid,
    IEnumCATEGORYINFO **ppenumCatInfo)
{
    TRACE("\n");
 
    if (ppenumCatInfo == NULL) return E_POINTER;
 
    return EnumCATEGORYINFO_Construct(lcid, ppenumCatInfo);
}
 
/**********************************************************************
 * COMCAT_ICatInformation_GetCategoryDesc
 */
static HRESULT WINAPI COMCAT_ICatInformation_GetCategoryDesc(
    LPCATINFORMATION iface,
    REFCATID rcatid,
    LCID lcid,
    PWCHAR *ppszDesc)
{
    WCHAR keyname[60] = L"Component Categories\\";
    HKEY key;
    HRESULT res;
 
    TRACE("CATID: %s LCID: %lx\n",debugstr_guid(rcatid), lcid);
 
    if (rcatid == NULL || ppszDesc == NULL) return E_INVALIDARG;
 
    /* Open the key for this category. */
    if (!StringFromGUID2(rcatid, keyname + 21, CHARS_IN_GUID)) return E_FAIL;
    res = open_classes_key(HKEY_CLASSES_ROOT, keyname, KEY_READ, &key);
    if (res != ERROR_SUCCESS) return CAT_E_CATIDNOEXIST;
 
    /* Allocate a sensible amount of memory for the description. */
    *ppszDesc = CoTaskMemAlloc(128 * sizeof(WCHAR));
    if (*ppszDesc == NULL) {
    RegCloseKey(key);
    return E_OUTOFMEMORY;
    }
 
    /* Get the description, and make sure it's null terminated. */
    res = COMCAT_GetCategoryDesc(key, lcid, *ppszDesc, 128);
    RegCloseKey(key);
    if (FAILED(res)) {
    CoTaskMemFree(*ppszDesc);
    return res;
    }
 
    return S_OK;
}
 
/**********************************************************************
 * COMCAT_ICatInformation_EnumClassesOfCategories
 */
static HRESULT WINAPI COMCAT_ICatInformation_EnumClassesOfCategories(
    LPCATINFORMATION iface,
    ULONG cImplemented,
    CATID *rgcatidImpl,
    ULONG cRequired,
    CATID *rgcatidReq,
    LPENUMCLSID *ppenumCLSID)
{
    struct class_categories *categories;
    HRESULT hr;
 
    TRACE("\n");
 
    if (cImplemented == (ULONG)-1)
        cImplemented = 0;
    if (cRequired == (ULONG)-1)
        cRequired = 0;
 
    if (ppenumCLSID == NULL ||
    (cImplemented && rgcatidImpl == NULL) ||
    (cRequired && rgcatidReq == NULL)) return E_POINTER;
 
    categories = COMCAT_PrepareClassCategories(cImplemented, rgcatidImpl,
                           cRequired, rgcatidReq);
    if (categories == NULL) return E_OUTOFMEMORY;
 
    hr = CLSIDEnumGUID_Construct(categories, ppenumCLSID);
    if (FAILED(hr))
    {
    HeapFree(GetProcessHeap(), 0, categories);
    return hr;
    }
 
    return hr;
}
 
/**********************************************************************
 * COMCAT_ICatInformation_IsClassOfCategories
 */
static HRESULT WINAPI COMCAT_ICatInformation_IsClassOfCategories(
    LPCATINFORMATION iface,
    REFCLSID rclsid,
    ULONG cImplemented,
    CATID *rgcatidImpl,
    ULONG cRequired,
    CATID *rgcatidReq)
{
    WCHAR keyname[45] = L"CLSID\\";
    HRESULT res;
    struct class_categories *categories;
    HKEY key;
 
    if (TRACE_ON(ole)) {
    ULONG count;
    TRACE("CLSID: %s Implemented %lu\n",debugstr_guid(rclsid),cImplemented);
    for (count = 0; count < cImplemented; ++count)
        TRACE("    %s\n",debugstr_guid(&rgcatidImpl[count]));
    TRACE("Required %lu\n",cRequired);
    for (count = 0; count < cRequired; ++count)
        TRACE("    %s\n",debugstr_guid(&rgcatidReq[count]));
    }
 
    if ((cImplemented && rgcatidImpl == NULL) ||
    (cRequired && rgcatidReq == NULL)) return E_POINTER;
 
    res = StringFromGUID2(rclsid, keyname + 6, CHARS_IN_GUID);
    if (FAILED(res)) return res;
 
    categories = COMCAT_PrepareClassCategories(cImplemented, rgcatidImpl,
                           cRequired, rgcatidReq);
    if (categories == NULL) return E_OUTOFMEMORY;
 
    res = open_classes_key(HKEY_CLASSES_ROOT, keyname, KEY_READ, &key);
    if (res == ERROR_SUCCESS) {
    res = COMCAT_IsClassOfCategories(key, categories);
    RegCloseKey(key);
    } else res = S_FALSE;
 
    HeapFree(GetProcessHeap(), 0, categories);
 
    return res;
}
 
/**********************************************************************
 * COMCAT_ICatInformation_EnumImplCategoriesOfClass
 */
static HRESULT WINAPI COMCAT_ICatInformation_EnumImplCategoriesOfClass(
    LPCATINFORMATION iface,
    REFCLSID rclsid,
    LPENUMCATID *ppenumCATID)
{
    TRACE("%s\n",debugstr_guid(rclsid));
 
    if (rclsid == NULL || ppenumCATID == NULL)
    return E_POINTER;
 
    return CATIDEnumGUID_Construct(rclsid, L"\\Implemented Categories", ppenumCATID);
}
 
/**********************************************************************
 * COMCAT_ICatInformation_EnumReqCategoriesOfClass
 */
static HRESULT WINAPI COMCAT_ICatInformation_EnumReqCategoriesOfClass(
    LPCATINFORMATION iface,
    REFCLSID rclsid,
    LPENUMCATID *ppenumCATID)
{
    TRACE("%s\n",debugstr_guid(rclsid));
 
    if (rclsid == NULL || ppenumCATID == NULL)
    return E_POINTER;
 
    return CATIDEnumGUID_Construct(rclsid, L"\\Required Categories", ppenumCATID);
}
 
/**********************************************************************
 * COMCAT_ICatRegister_Vtbl
 */
static const ICatRegisterVtbl COMCAT_ICatRegister_Vtbl =
{
    COMCAT_ICatRegister_QueryInterface,
    COMCAT_ICatRegister_AddRef,
    COMCAT_ICatRegister_Release,
    COMCAT_ICatRegister_RegisterCategories,
    COMCAT_ICatRegister_UnRegisterCategories,
    COMCAT_ICatRegister_RegisterClassImplCategories,
    COMCAT_ICatRegister_UnRegisterClassImplCategories,
    COMCAT_ICatRegister_RegisterClassReqCategories,
    COMCAT_ICatRegister_UnRegisterClassReqCategories
};
 
 
/**********************************************************************
 * COMCAT_ICatInformation_Vtbl
 */
static const ICatInformationVtbl COMCAT_ICatInformation_Vtbl =
{
    COMCAT_ICatInformation_QueryInterface,
    COMCAT_ICatInformation_AddRef,
    COMCAT_ICatInformation_Release,
    COMCAT_ICatInformation_EnumCategories,
    COMCAT_ICatInformation_GetCategoryDesc,
    COMCAT_ICatInformation_EnumClassesOfCategories,
    COMCAT_ICatInformation_IsClassOfCategories,
    COMCAT_ICatInformation_EnumImplCategoriesOfClass,
    COMCAT_ICatInformation_EnumReqCategoriesOfClass
};
 
HRESULT WINAPI ComCat_CreateInstance(IClassFactory *iface, IUnknown *pUnkOuter, REFIID riid, void **ppvObj)
{
    HRESULT res;
    TRACE("%s\n",debugstr_guid(riid));
 
    if (ppvObj == NULL) return E_POINTER;
 
    /* Don't support aggregation (Windows doesn't) */
    if (pUnkOuter != NULL) return CLASS_E_NOAGGREGATION;
 
    res = ICatRegister_QueryInterface(&COMCAT_ComCatMgr.ICatRegister_iface, riid, ppvObj);
    if (SUCCEEDED(res)) {
    return res;
    }
 
    return CLASS_E_CLASSNOTAVAILABLE;
}
 
/**********************************************************************
 * IEnumCATEGORYINFO implementation
 *
 * This implementation is not thread-safe.  The manager itself is, but
 * I can't imagine a valid use of an enumerator in several threads.
 */
typedef struct
{
    IEnumCATEGORYINFO IEnumCATEGORYINFO_iface;
    LONG  ref;
    LCID  lcid;
    HKEY  key;
    DWORD next_index;
} IEnumCATEGORYINFOImpl;
 
static inline IEnumCATEGORYINFOImpl *impl_from_IEnumCATEGORYINFO(IEnumCATEGORYINFO *iface)
{
    return CONTAINING_RECORD(iface, IEnumCATEGORYINFOImpl, IEnumCATEGORYINFO_iface);
}
 
static ULONG WINAPI COMCAT_IEnumCATEGORYINFO_AddRef(IEnumCATEGORYINFO *iface)
{
    IEnumCATEGORYINFOImpl *This = impl_from_IEnumCATEGORYINFO(iface);
 
    TRACE("\n");
 
    return InterlockedIncrement(&This->ref);
}
 
static HRESULT WINAPI COMCAT_IEnumCATEGORYINFO_QueryInterface(
    IEnumCATEGORYINFO *iface,
    REFIID riid,
    LPVOID *ppvObj)
{
    TRACE("%s\n",debugstr_guid(riid));
 
    if (ppvObj == NULL) return E_POINTER;
 
    if (IsEqualGUID(riid, &IID_IUnknown) ||
    IsEqualGUID(riid, &IID_IEnumCATEGORYINFO))
    {
        *ppvObj = iface;
    COMCAT_IEnumCATEGORYINFO_AddRef(iface);
    return S_OK;
    }
 
    return E_NOINTERFACE;
}
 
static ULONG WINAPI COMCAT_IEnumCATEGORYINFO_Release(IEnumCATEGORYINFO *iface)
{
    IEnumCATEGORYINFOImpl *This = impl_from_IEnumCATEGORYINFO(iface);
    ULONG ref;
 
    TRACE("\n");
 
    ref = InterlockedDecrement(&This->ref);
    if (ref == 0) {
    if (This->key) RegCloseKey(This->key);
    HeapFree(GetProcessHeap(), 0, This);
    return 0;
    }
    return ref;
}
 
static HRESULT WINAPI COMCAT_IEnumCATEGORYINFO_Next(
    IEnumCATEGORYINFO *iface,
    ULONG celt,
    CATEGORYINFO *rgelt,
    ULONG *pceltFetched)
{
    IEnumCATEGORYINFOImpl *This = impl_from_IEnumCATEGORYINFO(iface);
    ULONG fetched = 0;
 
    TRACE("\n");
 
    if (rgelt == NULL) return E_POINTER;
 
    if (This->key) while (fetched < celt) {
    LSTATUS res;
    HRESULT hr;
    WCHAR catid[CHARS_IN_GUID];
    DWORD cName = CHARS_IN_GUID;
    HKEY subkey;
 
    res = RegEnumKeyExW(This->key, This->next_index, catid, &cName,
                NULL, NULL, NULL, NULL);
    if (res != ERROR_SUCCESS && res != ERROR_MORE_DATA) break;
    ++(This->next_index);
 
    hr = CLSIDFromString(catid, &rgelt->catid);
    if (FAILED(hr)) continue;
 
    res = open_classes_key(This->key, catid, KEY_READ, &subkey);
    if (res != ERROR_SUCCESS) continue;
 
    hr = COMCAT_GetCategoryDesc(subkey, This->lcid,
                    rgelt->szDescription, 128);
    RegCloseKey(subkey);
    if (FAILED(hr)) continue;
 
    rgelt->lcid = This->lcid;
    ++fetched;
    ++rgelt;
    }
 
    if (pceltFetched) *pceltFetched = fetched;
    return fetched == celt ? S_OK : S_FALSE;
}
 
static HRESULT WINAPI COMCAT_IEnumCATEGORYINFO_Skip(
    IEnumCATEGORYINFO *iface,
    ULONG celt)
{
    IEnumCATEGORYINFOImpl *This = impl_from_IEnumCATEGORYINFO(iface);
 
    TRACE("\n");
 
    This->next_index += celt;
    /* This should return S_FALSE when there aren't celt elems to skip. */
    return S_OK;
}
 
static HRESULT WINAPI COMCAT_IEnumCATEGORYINFO_Reset(IEnumCATEGORYINFO *iface)
{
    IEnumCATEGORYINFOImpl *This = impl_from_IEnumCATEGORYINFO(iface);
 
    TRACE("\n");
 
    This->next_index = 0;
    return S_OK;
}
 
static HRESULT WINAPI COMCAT_IEnumCATEGORYINFO_Clone(
    IEnumCATEGORYINFO *iface,
    IEnumCATEGORYINFO **ppenum)
{
    IEnumCATEGORYINFOImpl *This = impl_from_IEnumCATEGORYINFO(iface);
    IEnumCATEGORYINFOImpl *new_this;
 
    TRACE("\n");
 
    if (ppenum == NULL) return E_POINTER;
 
    new_this = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IEnumCATEGORYINFOImpl));
    if (new_this == NULL) return E_OUTOFMEMORY;
 
    new_this->IEnumCATEGORYINFO_iface = This->IEnumCATEGORYINFO_iface;
    new_this->ref = 1;
    new_this->lcid = This->lcid;
    /* FIXME: could we more efficiently use DuplicateHandle? */
    open_classes_key(HKEY_CLASSES_ROOT, comcat_keyname, KEY_READ, &new_this->key);
    new_this->next_index = This->next_index;
 
    *ppenum = &new_this->IEnumCATEGORYINFO_iface;
    return S_OK;
}
 
static const IEnumCATEGORYINFOVtbl COMCAT_IEnumCATEGORYINFO_Vtbl =
{
    COMCAT_IEnumCATEGORYINFO_QueryInterface,
    COMCAT_IEnumCATEGORYINFO_AddRef,
    COMCAT_IEnumCATEGORYINFO_Release,
    COMCAT_IEnumCATEGORYINFO_Next,
    COMCAT_IEnumCATEGORYINFO_Skip,
    COMCAT_IEnumCATEGORYINFO_Reset,
    COMCAT_IEnumCATEGORYINFO_Clone
};
 
static HRESULT EnumCATEGORYINFO_Construct(LCID lcid, IEnumCATEGORYINFO **ret)
{
    IEnumCATEGORYINFOImpl *This;
 
    *ret = NULL;
 
    This = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IEnumCATEGORYINFOImpl));
    if (!This) return E_OUTOFMEMORY;
 
    This->IEnumCATEGORYINFO_iface.lpVtbl = &COMCAT_IEnumCATEGORYINFO_Vtbl;
    This->ref = 1;
    This->lcid = lcid;
    open_classes_key(HKEY_CLASSES_ROOT, comcat_keyname, KEY_READ, &This->key);
 
    *ret = &This->IEnumCATEGORYINFO_iface;
    return S_OK;
}
 
/**********************************************************************
 * ClassesOfCategories IEnumCLSID (IEnumGUID) implementation
 *
 * This implementation is not thread-safe.  The manager itself is, but
 * I can't imagine a valid use of an enumerator in several threads.
 */
typedef struct
{
    IEnumGUID IEnumGUID_iface;
    LONG  ref;
    struct class_categories *categories;
    HKEY  key;
    DWORD next_index;
} CLSID_IEnumGUIDImpl;
 
static inline CLSID_IEnumGUIDImpl *impl_from_IEnumCLSID(IEnumGUID *iface)
{
    return CONTAINING_RECORD(iface, CLSID_IEnumGUIDImpl, IEnumGUID_iface);
}
 
static HRESULT WINAPI CLSIDEnumGUID_QueryInterface(
    IEnumGUID *iface,
    REFIID riid,
    LPVOID *ppvObj)
{
    TRACE("%s\n",debugstr_guid(riid));
 
    if (ppvObj == NULL) return E_POINTER;
 
    if (IsEqualGUID(riid, &IID_IUnknown) ||
    IsEqualGUID(riid, &IID_IEnumGUID))
    {
        *ppvObj = iface;
    IEnumGUID_AddRef(iface);
    return S_OK;
    }
 
    return E_NOINTERFACE;
}
 
static ULONG WINAPI CLSIDEnumGUID_AddRef(IEnumGUID *iface)
{
    CLSID_IEnumGUIDImpl *This = impl_from_IEnumCLSID(iface);
    TRACE("\n");
 
    return InterlockedIncrement(&This->ref);
}
 
static ULONG WINAPI CLSIDEnumGUID_Release(IEnumGUID *iface)
{
    CLSID_IEnumGUIDImpl *This = impl_from_IEnumCLSID(iface);
    ULONG ref;
 
    TRACE("\n");
 
    ref = InterlockedDecrement(&This->ref);
    if (ref == 0) {
    if (This->key) RegCloseKey(This->key);
        HeapFree(GetProcessHeap(), 0, This->categories);
    HeapFree(GetProcessHeap(), 0, This);
    return 0;
    }
    return ref;
}
 
static HRESULT WINAPI CLSIDEnumGUID_Next(
    IEnumGUID *iface,
    ULONG celt,
    GUID *rgelt,
    ULONG *pceltFetched)
{
    CLSID_IEnumGUIDImpl *This = impl_from_IEnumCLSID(iface);
    ULONG fetched = 0;
 
    TRACE("\n");
 
    if (rgelt == NULL) return E_POINTER;
 
    if (This->key) while (fetched < celt) {
    LSTATUS res;
    HRESULT hr;
    WCHAR clsid[CHARS_IN_GUID];
    DWORD cName = CHARS_IN_GUID;
    HKEY subkey;
 
    res = RegEnumKeyExW(This->key, This->next_index, clsid, &cName,
                NULL, NULL, NULL, NULL);
    if (res != ERROR_SUCCESS && res != ERROR_MORE_DATA) break;
    ++(This->next_index);
 
    hr = CLSIDFromString(clsid, rgelt);
    if (FAILED(hr)) continue;
 
    res = open_classes_key(This->key, clsid, KEY_READ, &subkey);
    if (res != ERROR_SUCCESS) continue;
 
    hr = COMCAT_IsClassOfCategories(subkey, This->categories);
    RegCloseKey(subkey);
    if (hr != S_OK) continue;
 
    ++fetched;
    ++rgelt;
    }
 
    if (pceltFetched) *pceltFetched = fetched;
    return fetched == celt ? S_OK : S_FALSE;
}
 
static HRESULT WINAPI CLSIDEnumGUID_Skip(
    IEnumGUID *iface,
    ULONG celt)
{
    CLSID_IEnumGUIDImpl *This = impl_from_IEnumCLSID(iface);
 
    TRACE("\n");
 
    This->next_index += celt;
    FIXME("Never returns S_FALSE\n");
    return S_OK;
}
 
static HRESULT WINAPI CLSIDEnumGUID_Reset(IEnumGUID *iface)
{
    CLSID_IEnumGUIDImpl *This = impl_from_IEnumCLSID(iface);
 
    TRACE("\n");
 
    This->next_index = 0;
    return S_OK;
}
 
static HRESULT WINAPI CLSIDEnumGUID_Clone(
    IEnumGUID *iface,
    IEnumGUID **ppenum)
{
    CLSID_IEnumGUIDImpl *This = impl_from_IEnumCLSID(iface);
    CLSID_IEnumGUIDImpl *cloned;
 
    TRACE("(%p)->(%p)\n", This, ppenum);
 
    if (ppenum == NULL) return E_POINTER;
 
    *ppenum = NULL;
 
    cloned = HeapAlloc(GetProcessHeap(), 0, sizeof(CLSID_IEnumGUIDImpl));
    if (cloned == NULL) return E_OUTOFMEMORY;
 
    cloned->IEnumGUID_iface.lpVtbl = This->IEnumGUID_iface.lpVtbl;
    cloned->ref = 1;
 
    cloned->categories = HeapAlloc(GetProcessHeap(), 0, This->categories->size);
    if (cloned->categories == NULL) {
    HeapFree(GetProcessHeap(), 0, cloned);
    return E_OUTOFMEMORY;
    }
    memcpy(cloned->categories, This->categories, This->categories->size);
 
    cloned->key = NULL;
    open_classes_key(HKEY_CLASSES_ROOT, L"CLSID", KEY_READ, &cloned->key);
    cloned->next_index = This->next_index;
 
    *ppenum = &cloned->IEnumGUID_iface;
    return S_OK;
}
 
static const IEnumGUIDVtbl CLSIDEnumGUIDVtbl =
{
    CLSIDEnumGUID_QueryInterface,
    CLSIDEnumGUID_AddRef,
    CLSIDEnumGUID_Release,
    CLSIDEnumGUID_Next,
    CLSIDEnumGUID_Skip,
    CLSIDEnumGUID_Reset,
    CLSIDEnumGUID_Clone
};
 
static HRESULT CLSIDEnumGUID_Construct(struct class_categories *categories, IEnumCLSID **ret)
{
    CLSID_IEnumGUIDImpl *This;
 
    *ret = NULL;
 
    This = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CLSID_IEnumGUIDImpl));
    if (!This) return E_OUTOFMEMORY;
 
    This->IEnumGUID_iface.lpVtbl = &CLSIDEnumGUIDVtbl;
    This->ref = 1;
    This->categories = categories;
    open_classes_key(HKEY_CLASSES_ROOT, L"CLSID", KEY_READ, &This->key);
 
    *ret = &This->IEnumGUID_iface;
 
    return S_OK;
}
 
/**********************************************************************
 * CategoriesOfClass IEnumCATID (IEnumGUID) implementation
 *
 * This implementation is not thread-safe.  The manager itself is, but
 * I can't imagine a valid use of an enumerator in several threads.
 */
typedef struct
{
    IEnumGUID IEnumGUID_iface;
    LONG  ref;
    WCHAR keyname[68];
    HKEY  key;
    DWORD next_index;
} CATID_IEnumGUIDImpl;
 
static inline CATID_IEnumGUIDImpl *impl_from_IEnumCATID(IEnumGUID *iface)
{
    return CONTAINING_RECORD(iface, CATID_IEnumGUIDImpl, IEnumGUID_iface);
}
 
static HRESULT WINAPI CATIDEnumGUID_QueryInterface(
    IEnumGUID *iface,
    REFIID riid,
    LPVOID *ppvObj)
{
    TRACE("%s\n",debugstr_guid(riid));
 
    if (ppvObj == NULL) return E_POINTER;
 
    if (IsEqualGUID(riid, &IID_IUnknown) ||
    IsEqualGUID(riid, &IID_IEnumGUID))
    {
        *ppvObj = iface;
    IEnumGUID_AddRef(iface);
    return S_OK;
    }
 
    return E_NOINTERFACE;
}
 
static ULONG WINAPI CATIDEnumGUID_AddRef(IEnumGUID *iface)
{
    CATID_IEnumGUIDImpl *This = impl_from_IEnumCATID(iface);
    TRACE("\n");
 
    return InterlockedIncrement(&This->ref);
}
 
static ULONG WINAPI CATIDEnumGUID_Release(IEnumGUID *iface)
{
    CATID_IEnumGUIDImpl *This = impl_from_IEnumCATID(iface);
    ULONG ref;
 
    TRACE("\n");
 
    ref = InterlockedDecrement(&This->ref);
    if (ref == 0) {
    if (This->key) RegCloseKey(This->key);
    HeapFree(GetProcessHeap(), 0, This);
    return 0;
    }
    return ref;
}
 
static HRESULT WINAPI CATIDEnumGUID_Next(
    IEnumGUID *iface,
    ULONG celt,
    GUID *rgelt,
    ULONG *pceltFetched)
{
    CATID_IEnumGUIDImpl *This = impl_from_IEnumCATID(iface);
    ULONG fetched = 0;
 
    TRACE("\n");
 
    if (rgelt == NULL) return E_POINTER;
 
    if (This->key) while (fetched < celt) {
    LSTATUS res;
    HRESULT hr;
    WCHAR catid[CHARS_IN_GUID];
    DWORD cName = CHARS_IN_GUID;
 
    res = RegEnumKeyExW(This->key, This->next_index, catid, &cName,
                NULL, NULL, NULL, NULL);
    if (res != ERROR_SUCCESS && res != ERROR_MORE_DATA) break;
    ++(This->next_index);
 
    hr = CLSIDFromString(catid, rgelt);
    if (FAILED(hr)) continue;
 
    ++fetched;
    ++rgelt;
    }
 
    if (pceltFetched) *pceltFetched = fetched;
    return fetched == celt ? S_OK : S_FALSE;
}
 
static HRESULT WINAPI CATIDEnumGUID_Skip(
    IEnumGUID *iface,
    ULONG celt)
{
    CATID_IEnumGUIDImpl *This = impl_from_IEnumCATID(iface);
 
    TRACE("\n");
 
    This->next_index += celt;
    FIXME("Never returns S_FALSE\n");
    return S_OK;
}
 
static HRESULT WINAPI CATIDEnumGUID_Reset(IEnumGUID *iface)
{
    CATID_IEnumGUIDImpl *This = impl_from_IEnumCATID(iface);
 
    TRACE("\n");
 
    This->next_index = 0;
    return S_OK;
}
 
static HRESULT WINAPI CATIDEnumGUID_Clone(
    IEnumGUID *iface,
    IEnumGUID **ppenum)
{
    CATID_IEnumGUIDImpl *This = impl_from_IEnumCATID(iface);
    CATID_IEnumGUIDImpl *new_this;
 
    TRACE("\n");
 
    if (ppenum == NULL) return E_POINTER;
 
    new_this = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CATID_IEnumGUIDImpl));
    if (new_this == NULL) return E_OUTOFMEMORY;
 
    new_this->IEnumGUID_iface.lpVtbl = This->IEnumGUID_iface.lpVtbl;
    new_this->ref = 1;
    lstrcpyW(new_this->keyname, This->keyname);
    /* FIXME: could we more efficiently use DuplicateHandle? */
    open_classes_key(HKEY_CLASSES_ROOT, new_this->keyname, KEY_READ, &new_this->key);
    new_this->next_index = This->next_index;
 
    *ppenum = &new_this->IEnumGUID_iface;
    return S_OK;
}
 
static const IEnumGUIDVtbl CATIDEnumGUIDVtbl =
{
    CATIDEnumGUID_QueryInterface,
    CATIDEnumGUID_AddRef,
    CATIDEnumGUID_Release,
    CATIDEnumGUID_Next,
    CATIDEnumGUID_Skip,
    CATIDEnumGUID_Reset,
    CATIDEnumGUID_Clone
};
 
static HRESULT CATIDEnumGUID_Construct(REFCLSID rclsid, LPCWSTR postfix, IEnumGUID **ret)
{
    WCHAR keyname[100], clsidW[CHARS_IN_GUID];
    CATID_IEnumGUIDImpl *This;
 
    *ret = NULL;
 
    This = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CATID_IEnumGUIDImpl));
    if (!This) return E_OUTOFMEMORY;
 
    StringFromGUID2(rclsid, clsidW, CHARS_IN_GUID);
 
    This->IEnumGUID_iface.lpVtbl = &CATIDEnumGUIDVtbl;
    This->ref = 1;
    lstrcpyW(keyname, L"CLSID\\");
    lstrcatW(keyname, clsidW);
    lstrcatW(keyname, postfix);
 
    open_classes_key(HKEY_CLASSES_ROOT, keyname, KEY_READ, &This->key);
 
    *ret = &This->IEnumGUID_iface;
    return S_OK;
}