#include "shellprv.h"
#pragma  hdrstop

#include "control.h"

HDSA g_hacplmLoaded = NULL;

void ConvertCplInfo(void * lpv)
{
   NEWCPLINFOA   CplInfoA;
   LPNEWCPLINFOW lpCplInfoW = (LPNEWCPLINFOW)lpv;

   memcpy(&CplInfoA, lpv, sizeof(CplInfoA));

   MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED,
                        CplInfoA.szName, ARRAYSIZE(CplInfoA.szName),
                        lpCplInfoW->szName, ARRAYSIZE(lpCplInfoW->szName));
   MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED,
                        CplInfoA.szInfo, ARRAYSIZE(CplInfoA.szInfo),
                        lpCplInfoW->szInfo, ARRAYSIZE(lpCplInfoW->szInfo));
   MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED,
                        CplInfoA.szHelpFile, ARRAYSIZE(CplInfoA.szHelpFile),
                        lpCplInfoW->szHelpFile, ARRAYSIZE(lpCplInfoW->szHelpFile));
   lpCplInfoW->dwSize = sizeof(NEWCPLINFOW);
}

//  See if pszShort is a truncated version of the string referred to by
//  hinst/id.  If so, then use the long string.  This is to work around
//  a "bad design feature" of CPL_NEWINQUIRE where the app returns a buffer
//  (which is only 32 or 64 chars long) rather than a resource id
//  like CPL_INQUIRE.  So if the app responds to both messages, and the
//  NEWINQUIRE string is a truncated version of the INQUIRE string, then
//  switch to the INQUIRE string.

LPTSTR _RestoreTruncatedCplString(
        HINSTANCE hinst,
        int id,
        LPTSTR pszShort,
        LPTSTR pszBuf,
        int cchBufMax)
{
    int cchLenShort, cchLen;

    cchLenShort = lstrlen(pszShort);
    cchLen = LoadString(hinst, id, pszBuf, cchBufMax);

    // Don't use SHTruncateString since KERNEL32 doesn't either
    if (StrCmpNC(pszShort, pszBuf, cchLenShort) == 0)
    {
        pszShort = pszBuf;
    }
    return pszShort;
}

//
//  Initializes *pcpli.
//
// Requires:
//  *pcpli is filled with 0 & NULL's.
//
BOOL _InitializeControl(LPCPLMODULE pcplm, LPCPLITEM pcpli)
{
    BOOL fSucceed = TRUE;
    union {
        NEWCPLINFO  Native;
        NEWCPLINFOA NewCplInfoA;
        NEWCPLINFOW NewCplInfoW;
    } Newcpl;
    CPLINFO cpl;
    TCHAR szName[MAX_CCH_CPLNAME];
    TCHAR szInfo[MAX_CCH_CPLINFO];
    LPTSTR pszName = Newcpl.Native.szName, pszInfo = Newcpl.Native.szInfo;
    HICON hIconTemp = NULL;

    //
    // always do the old method to get the icon ID
    //
    cpl.idIcon = 0;

    CPL_CallEntry(pcplm, NULL, CPL_INQUIRE, (LONG)pcpli->idControl, (LONG_PTR)(LPCPLINFO)&cpl);

    //
    // if this is a 32bit CPL and it gave us an ID then validate it
    // this fixes ODBC32 which gives back a bogus ID but a correct HICON
    // note that the next load of the same icon should be very fast
    //
    if (cpl.idIcon)
    {
        hIconTemp = LoadImage(pcplm->minst.hinst, MAKEINTRESOURCE(cpl.idIcon),
            IMAGE_ICON, 0, 0, LR_DEFAULTSIZE);

        if (!hIconTemp)
        {
            // the id was bogus, make it a negative number (invalid resource)...
            cpl.idIcon = -1;
            TraceMsg(TF_GENERAL, "_InitializaControl: %s returned an invalid icon id, ignoring", pcplm->szModule);
        }
    }

    pcpli->idIcon = cpl.idIcon;

    //
    //  Try the new method first and call it with the largest structure
    //  so it doesn't overwrite anything on the stack.  If you put a
    //  Unicode applet on Windows '95 it will kill the Explorer because
    //  it trashes memory by overwriting the stack.
    //
    memset(&Newcpl,0,sizeof(Newcpl));

    CPL_CallEntry(pcplm, NULL, CPL_NEWINQUIRE, (LONG)pcpli->idControl,
                    (LONG_PTR)(LPCPLINFO)&Newcpl);

    //
    //  If the call is to an ANSI applet, convert strings to Unicode
    //
    // I'm leaving this ANSI-only code as it helps explain
    // the way some of the subsequent code works - or why it was
    // written the way it was. [brianau - 03/07/02]
    //
#ifdef UNICODE
#define UNNATIVE_SIZE   sizeof(NEWCPLINFOA)
#else
#define UNNATIVE_SIZE   sizeof(NEWCPLINFOW)
#endif

    if (Newcpl.Native.dwSize == UNNATIVE_SIZE)
    {
        ConvertCplInfo(&Newcpl);        // This will set Newcpl.Native.dwSize
    }

    if (Newcpl.Native.dwSize == sizeof(NEWCPLINFO))
    {
       pszName = _RestoreTruncatedCplString(pcplm->minst.hinst, cpl.idName, pszName, szName, ARRAYSIZE(szName));
       pszInfo = _RestoreTruncatedCplString(pcplm->minst.hinst, cpl.idInfo, pszInfo, szInfo, ARRAYSIZE(szInfo));
    }
    else
    {
        Newcpl.Native.hIcon = LoadImage(pcplm->minst.hinst, MAKEINTRESOURCE(cpl.idIcon), IMAGE_ICON, 0, 0, LR_DEFAULTSIZE);
        pszName = szName;
        LoadString(pcplm->minst.hinst, cpl.idName, szName, ARRAYSIZE(szName));
        pszInfo = szInfo;
        LoadString(pcplm->minst.hinst, cpl.idInfo, szInfo, ARRAYSIZE(szInfo));
        Newcpl.Native.szHelpFile[0] = 0;
        Newcpl.Native.lData = cpl.lData;
        Newcpl.Native.dwHelpContext = 0;
    }

    pcpli->hIcon = Newcpl.Native.hIcon;

    if (hIconTemp)
        DestroyIcon(hIconTemp);

    fSucceed = Str_SetPtr(&pcpli->pszName, pszName)
            && Str_SetPtr(&pcpli->pszInfo, pszInfo)
            && Str_SetPtr(&pcpli->pszHelpFile, Newcpl.Native.szHelpFile);

    pcpli->lData = Newcpl.Native.lData;
    pcpli->dwContext = Newcpl.Native.dwHelpContext;

#ifdef DEBUG
    if (!pcpli->idIcon)
        TraceMsg(TF_GENERAL, "PERFORMANCE: cannot cache %s because no icon ID for <%s>", pcplm->szModule, pcpli->pszName);
#endif

    return fSucceed;
}


//
// Terminate the control
//
void _TerminateControl(LPCPLMODULE pcplm, LPCPLITEM pcpli)
{
    if (pcpli->hIcon)
    {
        DestroyIcon(pcpli->hIcon);
        pcpli->hIcon = NULL;
    }

    Str_SetPtr(&pcpli->pszName, NULL);
    Str_SetPtr(&pcpli->pszInfo, NULL);
    Str_SetPtr(&pcpli->pszHelpFile, NULL);
    CPL_CallEntry(pcplm, NULL, CPL_STOP, pcpli->idControl, pcpli->lData);
}


void _FreeLibraryForControlPanel(MINST *pminst)
{
    FreeLibrary(pminst->hinst);
}

//
//  For each control of the specified CPL module, call the control entry
//  with CPL_STOP. Then, call it with CPL_EXIT.
//
void _TerminateCPLModule(LPCPLMODULE pcplm)
{
    if (pcplm->minst.hinst)
    {
        ULONG_PTR dwCookie = 0;

        if (pcplm->lpfnCPL)
        {
            if (pcplm->hacpli)
            {
                int cControls, i;

                for (i = 0, cControls = DSA_GetItemCount(pcplm->hacpli); i < cControls; ++i)
                {
                    LPCPLITEM pcpli = DSA_GetItemPtr(pcplm->hacpli, i);
                    _TerminateControl(pcplm, pcpli);
                }

                DSA_DeleteAllItems(pcplm->hacpli);
                DSA_Destroy(pcplm->hacpli);
                pcplm->hacpli=NULL;
            }

            CPL_CallEntry(pcplm, NULL, CPL_EXIT, 0, 0);
            pcplm->lpfnCPL=NULL;
        }

        ActivateActCtx(pcplm->hActCtx, &dwCookie);
        _FreeLibraryForControlPanel(&pcplm->minst);
        if (dwCookie != 0)
            DeactivateActCtx(0, dwCookie);

        pcplm->minst.hinst = NULL;
    }

    pcplm->minst.idOwner = (DWORD)-1;

    if (pcplm->hActCtx != NULL)
    {
        ReleaseActCtx(pcplm->hActCtx);
        pcplm->hActCtx = NULL;
    }

    if (pcplm->minst.hOwner)
    {
        CloseHandle(pcplm->minst.hOwner);
        pcplm->minst.hOwner = NULL;
    }
}


//
// Initializes the CPL Module.
//
// Requires:
//  *pcplm should be initialized appropriately.
//
//
BOOL _InitializeCPLModule(LPCPLMODULE pcplm)
{
    BOOL fSuccess = FALSE;

    pcplm->lpfnCPL32 = (APPLET_PROC)GetProcAddress(pcplm->minst.hinst, "CPlApplet");

    //
    // Initialize the CPL
    if (pcplm->lpfnCPL &&
        CPL_CallEntry(pcplm, NULL, CPL_INIT, 0, 0))
    {
        int cControls = (int)CPL_CallEntry(pcplm, NULL, CPL_GETCOUNT, 0, 0);

        if (cControls>0)
        {
            //
            // By passing in the number of applets, we should speed up allocation
            // of this array.
            //

            pcplm->hacpli = DSA_Create(sizeof(CPLITEM), cControls);

            if (pcplm->hacpli)
            {
                int i;

                fSuccess = TRUE; // succeded, so far.

                // Go through the applets and load the information about them

                for (i = 0; i < cControls; ++i)
                {
                    CPLITEM control = {i, 0};

                    if (_InitializeControl(pcplm, &control))
                    {
                        // removing this now saves us from doing it later

                        CPL_StripAmpersand(control.pszName);

                        if (DSA_AppendItem(pcplm->hacpli, &control) >= 0)
                        {
                            continue;
                        }
                    }

                    _TerminateControl(pcplm, &control);
                    fSuccess=FALSE;
                    break;
                }
            }
        }
    }
    else
    {
        // don't ever call it again if we couldn't CPL_INIT
        pcplm->lpfnCPL = NULL;
    }

    return fSuccess;
}


//
// Returns:
//   The index to the g_hacplmLoaded, if the specified DLL is already
//  loaded; -1 otherwise.
//
int _FindCPLModule(const MINST * pminst)
{
    int i = -1; // Assumes error

    ENTERCRITICAL;
    if (g_hacplmLoaded)
    {
        for (i=DSA_GetItemCount(g_hacplmLoaded)-1; i>=0; --i)
        {
            LPCPLMODULE pcplm = DSA_GetItemPtr(g_hacplmLoaded, i);

            //
            // owner id tested last since hinst is more varied
            //

            if ((pcplm->minst.hinst == pminst->hinst) &&
                (pcplm->minst.idOwner == pminst->idOwner))
            {
                break;
            }
        }
    }
    LEAVECRITICAL;
    return i;
}

LPCPLMODULE FindCPLModule(const MINST * pminst)
{
    return (LPCPLMODULE) DSA_GetItemPtr(g_hacplmLoaded, _FindCPLModule(pminst));
}


//
// Adds the specified CPL module to g_hacplmLoaded.
//
// Requires:
//  The specified CPL module is not in g_hacplmLoaded yet.
//
// Returns:
//  The index to the CPL module if succeeded; -1 otherwise.
//
int _AddModule(LPCPLMODULE pcplm)
{
    int     result;

    //
    // Create the Loaded Modules guy if necessary
    //
    ENTERCRITICAL;
    if (g_hacplmLoaded == NULL)
        g_hacplmLoaded = DSA_Create(sizeof(CPLMODULE), 4);
    //
    // Add this CPL to our list
    //
    if (g_hacplmLoaded == NULL)
        result = -1;
    else
        result = DSA_AppendItem(g_hacplmLoaded, pcplm);
    LEAVECRITICAL;
    return(result);
}


#define SZ_RUNDLL32_NOEXCEPT_ARGS       TEXT("/d ")
BOOL CatchCPLExceptions(UINT msg)
{
    LPCTSTR pszCmdLine = GetCommandLine();
    BOOL fCatch = TRUE;

    // Some callers don't want to run and have exceptions caught.
    // This will allow crashes to be uploaded to PCHealth.
    if (((CPL_STARTWPARMSA == msg) || (CPL_STARTWPARMS == msg) || (CPL_DBLCLK == msg)) &&
        StrCmpNI(pszCmdLine, SZ_RUNDLL32_NOEXCEPT_ARGS, (ARRAYSIZE(SZ_RUNDLL32_NOEXCEPT_ARGS) - 1)))
    {
        fCatch = FALSE;
    }

    return fCatch;
}


LRESULT CPL_CallEntry(LPCPLMODULE pcplm, HWND hwnd, UINT msg, LPARAM lParam1, LPARAM lParam2)
{
    LRESULT lres;
    ULONG_PTR dwCookie = 0;

    ActivateActCtx(pcplm->hActCtx, &dwCookie);

    if (!CatchCPLExceptions(msg))
    {
        lres = pcplm->lpfnCPL32(hwnd, msg, lParam1, lParam2);
    }
    else
    {
        __try
        {
            lres = pcplm->lpfnCPL32(hwnd, msg, lParam1, lParam2);
        }
        __except(SetErrorMode(SEM_NOGPFAULTERRORBOX),UnhandledExceptionFilter(GetExceptionInformation()))
        {
            TraceMsg(TF_ERROR, "CPL: Exception calling CPL module: %s", pcplm->szModule);
            ShellMessageBox(HINST_THISDLL, NULL, MAKEINTRESOURCE(IDS_CPL_EXCEPTION),
                    MAKEINTRESOURCE(IDS_CONTROLPANEL),
                    MB_OK | MB_ICONEXCLAMATION | MB_SYSTEMMODAL,
                    (LPTSTR)pcplm->szModule);
            lres = 0;
        }
    }

    if (dwCookie != 0)
        DeactivateActCtx(0, dwCookie);

    return lres;
}

EXTERN_C DECLSPEC_IMPORT BOOL STDAPICALLTYPE
ApphelpCheckExe(
     LPCWSTR lpApplicationName,
     BOOL    bApphelp,
     BOOL    bShim,
     BOOL    bUseModuleName
     );
//
// Loads the specified CPL module and returns the index to g_hacplmLoaded.
//
int _LoadCPLModule(LPCTSTR pszModule)
{
    TCHAR szManifest[MAX_PATH];
    HANDLE hActCtx = NULL;
    MINST minst;
    int iModule;
    ULONG_PTR dwCookie;
    ACTCTX act = {0};
#ifndef UNICODE
    WCHAR wszModuleName[MAX_PATH];
#endif
    LPWSTR pwszModuleName = NULL;

    if (FAILED(StringCchPrintf(szManifest, ARRAYSIZE(szManifest), TEXT("%s.manifest"), pszModule)))
    {
        return -1;
    }

    minst.idOwner = GetCurrentProcessId();
    minst.hOwner = OpenProcess(SYNCHRONIZE,FALSE,minst.idOwner);
    if (NULL == minst.hOwner)
    {
        return -1;
    }

    // See if this application has a context
    if (PathFileExists(szManifest))
    {
        act.cbSize = sizeof(act);
        act.dwFlags = 0;
        act.lpSource = szManifest;
        hActCtx = CreateActCtx(&act);
    }
    else
    {
        act.cbSize = sizeof(act);
        act.dwFlags = ACTCTX_FLAG_RESOURCE_NAME_VALID;
        act.lpSource = pszModule;
        act.lpResourceName = MAKEINTRESOURCE(123);

        hActCtx = CreateActCtx(&act);
    }

    if (hActCtx == INVALID_HANDLE_VALUE)
        hActCtx = NULL;

    ActivateActCtx(hActCtx, &dwCookie);

    //
    // check and [possibly] fix this module
    //

#ifdef UNICODE
    pwszModuleName = (LPWSTR)pszModule;

#else  // if !defined(UNICODE)
    if (MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED,
                            pszModule, -1,
                            wszModuleName, ARRAYSIZE(wszModuleName)) != 0) {
        pwszModuleName = wszModuleName;
    }

#endif // UNICODE

    if (!ApphelpCheckExe(pwszModuleName, TRUE, TRUE, TRUE)) {
        minst.hinst = NULL;
    } else {
        minst.hinst = LoadLibrary(pszModule);
    }

    if (dwCookie != 0)
        DeactivateActCtx(0, dwCookie);


    if (!ISVALIDHINSTANCE(minst.hinst))
    {
        if (hActCtx != NULL) {
            ReleaseActCtx(hActCtx);
        }

        CloseHandle(minst.hOwner);

        return -1;
    }

    //
    // Check if this module is already in the list.
    //

    iModule = _FindCPLModule(&minst);

    if (iModule >= 0)
    {
        //
        // Yes. Increment the reference count and return the ID.
        //
        LPCPLMODULE pcplm;

        ENTERCRITICAL;
        pcplm = DSA_GetItemPtr(g_hacplmLoaded, iModule);
        ++pcplm->cRef;
        LEAVECRITICAL;

        ActivateActCtx(hActCtx, &dwCookie);
        //
        // Decrement KERNELs reference count
        //
        _FreeLibraryForControlPanel(&minst);
        if (dwCookie != 0)
            DeactivateActCtx(0, dwCookie);

        if (hActCtx != NULL)
            ReleaseActCtx(hActCtx);

        CloseHandle(minst.hOwner);
    }
    else
    {
        CPLMODULE sModule = {0};


        //
        // No. Append it.
        //

        sModule.cRef = 1;
        sModule.minst = minst;
        sModule.hActCtx = hActCtx;

        GetModuleFileName(minst.hinst, sModule.szModule, ARRAYSIZE(sModule.szModule));

        if (_InitializeCPLModule(&sModule))
        {
            iModule = _AddModule(&sModule);
        }

        if (iModule < 0)
        {
            _TerminateCPLModule(&sModule);
        }
    }
    return iModule;
}


int _FreeCPLModuleIndex(int iModule)
{
    LPCPLMODULE pcplm;

    ENTERCRITICAL;
    pcplm = DSA_GetItemPtr(g_hacplmLoaded, iModule);

    if (!pcplm)
    {
        LEAVECRITICAL;
        return(-1);
    }

    //
    // Dec the ref count; return if not 0
    //

    --pcplm->cRef;

    if (pcplm->cRef)
    {
        LEAVECRITICAL;
        return(pcplm->cRef);
    }

    //
    // Free up the whole thing and return 0
    //

    _TerminateCPLModule(pcplm);

    DSA_DeleteItem(g_hacplmLoaded, iModule);

    //
    // Destroy this when all CPLs have been removed
    //

    if (DSA_GetItemCount(g_hacplmLoaded) == 0)
    {
        DSA_Destroy(g_hacplmLoaded);
        g_hacplmLoaded = NULL;
    }
    LEAVECRITICAL;
    return(0);
}


int _FreeCPLModuleHandle(const MINST * pminst)
{
    int iModule;

    //
    // Check if the module is actually loaded (major error if not)
    //

    iModule = _FindCPLModule(pminst);

    if (iModule < 0)
    {
        return(-1);
    }

    return _FreeCPLModuleIndex(iModule);
}

int CPL_FreeCPLModule(LPCPLMODULE pcplm)
{
    return _FreeCPLModuleHandle(&pcplm->minst);
}


void CPL_StripAmpersand(LPTSTR szBuffer)
{
    LPTSTR pIn, pOut;

    //
    // copy the name sans '&' chars
    //

    pIn = pOut = szBuffer;
    do
    {
        //
        // strip FE accelerators with parentheses.  e.g. "foo(&F)" -> "foo"
        //
        if (*pIn == TEXT('(') && *(pIn+1) == TEXT('&') &&
            *(pIn+2) && *(pIn+3) == TEXT(')')) {
            pIn += 4;
        }

#ifdef DBCS
        // Also strip FE accelerators in old win31 cpl, i.e, 01EH/01FH.
        if (*pIn == 0x1e && *++pIn) {


            // Assumes a character right before the mnemonic
            // is a parenthesis or something to be removed as well.
            //
            pOut=CharPrev(szBuffer, pOut);

            // Skip Alphabet accelerator.
            pIn = CharNext(pIn);

            if (*pIn) {
                if (*pIn == 0x1f && *++pIn) {

                    // Skip FE accelelator
                    //
                    pIn = CharNext(pIn);
                }
                // Skip second parenthesis.
                //
                pIn = CharNext(pIn);
            }
        }
#endif
        if (*pIn != TEXT('&')) {
            *pOut++ = *pIn;
        }
        if (IsDBCSLeadByte(*pIn)) {
            *pOut++ = *++pIn;
        }
    } while (*pIn++) ;
}


//
// filter out bogus old ini keys... we may be able to blow this off
BOOL IsValidCplKey(LPCTSTR pszKey)
{
    return lstrcmpi(pszKey, TEXT("NumApps")) &&
        !((*(pszKey+1) == 0) &&
        ((*pszKey == TEXT('X')) || (*pszKey == TEXT('Y')) || (*pszKey == TEXT('W')) || (*pszKey == TEXT('H'))));
}


LPCPLMODULE CPL_LoadCPLModule(LPCTSTR szModule)
{
    LPCPLMODULE result;

    int iModule = _LoadCPLModule(szModule);

    if (iModule < 0)
        result = NULL;
    else
    {
        ENTERCRITICAL;
        result = DSA_GetItemPtr(g_hacplmLoaded, iModule);
        LEAVECRITICAL;
    }
    return result;
}

BOOL DontLoadCPL(LPCTSTR pszName)
{
    // the first reg location is the old alias for control.ini [don't load]
    // entries that map into the registry on NT. the next is for per
    // machine support to hide cpls, new for whistler
    return (SHGetValue(HKEY_CURRENT_USER,  TEXT("Control Panel\\don't load"), pszName, NULL, NULL, NULL) == ERROR_SUCCESS) ||
           (SHGetValue(HKEY_LOCAL_MACHINE, TEXT("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Control Panel\\don't load"), pszName, NULL, NULL, NULL) == ERROR_SUCCESS);
}

// Called for each CPL module file which we may want to load
void _InsertModuleName(ControlData *lpData, LPCTSTR szPath, PMODULEINFO pmi)
{
    pmi->pszModule = NULL;
    Str_SetPtr(&pmi->pszModule, szPath);

    if (pmi->pszModule)
    {
        int i;

        pmi->pszModuleName = PathFindFileName(pmi->pszModule);

        if (DontLoadCPL(pmi->pszModuleName))
        {
            Str_SetPtr(&pmi->pszModule, NULL);
            goto skip;
        }

        // don't insert the module if it's already in the list!

        for (i = DSA_GetItemCount(lpData->hamiModule)-1 ; i >= 0 ; i--)
        {
            PMODULEINFO pmi1 = DSA_GetItemPtr(lpData->hamiModule, i);

            if (!lstrcmpi(pmi1->pszModuleName, pmi->pszModuleName))
            {
                Str_SetPtr(&pmi->pszModule, NULL);
                goto skip;
            }
        }

        DSA_AppendItem(lpData->hamiModule, pmi);
skip:
        ;
    }
}

#define GETMODULE(haminst,i)     ((MINST *)DSA_GetItemPtr(haminst, i))
#define ADDMODULE(haminst,pminst) DSA_AppendItem(haminst, (void *)pminst)

int _LoadCPLModuleAndAdd(ControlData *lpData, LPCTSTR szModule)
{
    int iModule, i;
    LPCPLMODULE pcplm;

    //
    // Load the module and controls (or get the previous one if already
    // loaded).
    //

    iModule = _LoadCPLModule(szModule);

    if (iModule < 0)
    {
        TraceMsg(TF_WARNING, "_LoadCPLModuleAndAdd: _LoadControls refused %s", szModule);
        return -1;
    }

    pcplm = DSA_GetItemPtr(g_hacplmLoaded, iModule);

    if (pcplm == NULL)
    {
        TraceMsg(TF_WARNING, "_LoadCPLModuleAndAdd: DSA returned NULL structure");
        return -1;
    }

    //
    // Check if this guy has already loaded this module
    //

    for (i = DSA_GetItemCount(lpData->haminst) - 1; i >= 0; --i)
    {
        const MINST * pminst = GETMODULE(lpData->haminst,i);

        //
        // note: owner id tested last since hinst is more varied
        //

        if ((pminst->hinst == pcplm->minst.hinst) &&
            (pminst->idOwner == pcplm->minst.idOwner))
        {
FreeThisModule:

            //
            // This guy already loaded this module, so dec
            // the reference and return failure
            //

            _FreeCPLModuleIndex(iModule);
            return(-1);
        }
    }

    //
    // this is a new module, so add it to the list
    //

    if (ADDMODULE(lpData->haminst, &pcplm->minst) < 0)
    {
        goto FreeThisModule;
    }

    return iModule;
}


void _AddItemsFromKey(ControlData *pcd, HKEY hkRoot)
{
    HKEY hkey;
    MODULEINFO mi = {0};

    mi.flags = MI_FIND_FILE;

    if (ERROR_SUCCESS == RegOpenKeyEx(hkRoot,
                                      TEXT("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Control Panel\\CPLs"),
                                      0,
                                      KEY_QUERY_VALUE,
                                      &hkey))
    {
        TCHAR szData[MAX_PATH], szValue[128];
        DWORD dwSizeData, dwValue, dwIndex;

        for (dwIndex = 0;
            ERROR_SUCCESS == (dwValue = ARRAYSIZE(szValue), dwSizeData = sizeof(szData),
                RegEnumValue(hkey, dwIndex, szValue, &dwValue, NULL, NULL, (BYTE *)szData, &dwSizeData));
            dwIndex++)
        {
            TCHAR szPath[MAX_PATH];
            if (SHExpandEnvironmentStrings(szData, szPath, ARRAYSIZE(szPath)))
            {
                WIN32_FIND_DATA fd;
                HANDLE hfind = FindFirstFile(szPath, &fd);
                if (hfind != INVALID_HANDLE_VALUE)
                {
                    mi.ftCreationTime = fd.ftCreationTime;
                    mi.nFileSizeHigh = fd.nFileSizeHigh;
                    mi.nFileSizeLow = fd.nFileSizeLow;
                    FindClose(hfind);

                    _InsertModuleName(pcd, szPath, &mi);
                }
            }
        }
        RegCloseKey(hkey);
    }
}


/* Get the keynames under [MMCPL] in CONTROL.INI and cycle
   through all such keys to load their applets into our
   list box.  Also allocate the array of CPLMODULE structs.
   Returns early if can't load old WIN3 applets.
*/
BOOL CPLD_GetModules(ControlData *lpData)
{
    LPTSTR       pStr;
    HANDLE   hFindFile;
    WIN32_FIND_DATA findData;
    MODULEINFO mi;
    TCHAR szPath[MAX_PATH], szSysDir[MAX_PATH], szName[MAX_PATH];

    ASSERT(lpData->hamiModule == NULL);

    lpData->hamiModule = DSA_Create(sizeof(mi), 4);

    if (!lpData->hamiModule)
    {
        return FALSE;
    }

    lpData->haminst = DSA_Create(sizeof(MINST), 4);

    if (!lpData->haminst)
    {
        DSA_Destroy(lpData->hamiModule);
        lpData->hamiModule = NULL; // no one is freeing hamiModule in the caller if this fails, but just to make sure ...
        return FALSE;
    }

    //
    // So here's the deal:
    // We have this global list of all modules that have been loaded, along
    // with a reference count for each.  This is so that we don't need to
    // load a CPL file again when the user double clicks on it.
    // We still need to keep a list for each window that is open, so that
    // we will not load the same CPL twice in a single window.  Therefore,
    // we need to keep a list of all modules that are loaded (note that
    // we cannot just keep indexes, since the global list can move around).
    //
    // hamiModule contains the module name, the instance info if loaded,
    // and some other information for comparing with cached information
    //

    ZeroMemory(&mi, sizeof(mi));

    //
    // don't special case main, instead sort the data by title
    //

    GetSystemDirectory(szSysDir, ARRAYSIZE(szSysDir));

    // load the modules specified in CONTROL.INI under [MMCPL]
    {
        TCHAR szKeys[512];    // from section of extra cpls to load
        GetPrivateProfileString(TEXT("MMCPL"), NULL, c_szNULL, szKeys, ARRAYSIZE(szKeys), TEXT("control.ini"));

        for (pStr = szKeys; *pStr; pStr += lstrlen(pStr) + 1)
        {
            GetPrivateProfileString(TEXT("MMCPL"), pStr, c_szNULL, szName, ARRAYSIZE(szName), TEXT("control.ini"));
            if (IsValidCplKey(pStr))
            {
                _InsertModuleName(lpData, szName, &mi);
            }
        }
    }

    // load applets from the system directory

    if (PathCombine(szPath, szSysDir, TEXT("*.CPL")))
    {
        mi.flags |= MI_FIND_FILE;

        hFindFile = FindFirstFile(szPath, &findData);

        if (hFindFile != INVALID_HANDLE_VALUE)
        {
            do
            {
                if (!(findData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY))
                {
                    BOOL fOkToUse = TRUE;

                    if (IsOS(OS_WOW6432))
                    {
                        GetWindowsDirectory(szPath,ARRAYSIZE(szPath));
                        if (PathCombine(szPath, szPath, TEXT("system32")) &&
                            PathCombine(szPath, szPath, findData.cFileName))
                        {
                            //
                            // Don't use any CPLs which exist in the real system32
                            // directory, since we only have them in the fake system
                            // directory for compatibility reasons.
                            //
                            if (PathFileExists(szPath))
                            {
                                fOkToUse = FALSE;
                            }
                        }
                    }

                    if (fOkToUse)
                    {
                        if (PathCombine(szPath, szSysDir, findData.cFileName))
                        {
                            mi.ftCreationTime = findData.ftCreationTime;
                            mi.nFileSizeHigh = findData.nFileSizeHigh;
                            mi.nFileSizeLow = findData.nFileSizeLow;

                            _InsertModuleName(lpData, szPath, &mi);
                        }
                    }
                }
            } while (FindNextFile(hFindFile, &findData));

            FindClose(hFindFile);
        }
    }

    _AddItemsFromKey(lpData, HKEY_CURRENT_USER);
    _AddItemsFromKey(lpData, HKEY_LOCAL_MACHINE);

    lpData->cModules = DPA_GetPtrCount(lpData->hamiModule);

    return TRUE;
}



//
// A bug has existed in Control Panel for as long as I can tell that,
// under the right conditions involving roaming user profiles, could
// prevent a control panel item from appearing in the folder.  The
// problem description is too long for a comment but the MI_REG_INVALID
// flag was added to solve it.  See it's use in CControlPanelEnum::Next.
// However, presentation caches created prior to this fix under the
// problem scenario may still result in affected CPL items not appearing.
// In those cases, refreshing the presentation cache using the new code
// corrects the problem.  Therefore, any cache created prior to the date
// of this new code's introduction must be discarded and refreshed.
// The presence of the REGCPL_POST_102001 (oct 2001) flag in a cache entry
// indicates the cache was created after this new code was introduced and may
// be safely used.  This function reports the presence/absence of this
// flag in the cache buffer.  [brianau - 10/03/01]
//
BOOL _IsPresentationCachePostOctober2001(LPBYTE pbData, DWORD cbData)
{
    BOOL bPostOct2001 = FALSE;
    if (cbData >= sizeof(REG_CPL_INFO))
    {
        if (REGCPL_POST_102001 & ((REG_CPL_INFO *)pbData)->flags)
        {
            bPostOct2001 = TRUE;
        }
    }
    return bPostOct2001;
}


//  Read the registry for cached CPL info.
//  If this info is up-to-date with current modules (from CPLD_GetModules),
//  then we can enumerate these without loading the CPLs.

void CPLD_GetRegModules(ControlData *lpData)
{
    HKEY hkey;
    LPCTSTR lpszRegKey;

    // dont cache any-thing in clean boot.
    if (GetSystemMetrics(SM_CLEANBOOT))
        return;

    if (IsOS(OS_WOW6432))
    {
        lpszRegKey = TEXT("Software\\Microsoft\\Windows\\CurrentVersion\\Controls Folder (Wow64)");
    }
    else
    {
        lpszRegKey = REGSTR_PATH_CONTROLSFOLDER;
    }

    if (ERROR_SUCCESS == RegOpenKeyEx(HKEY_CURRENT_USER,
                                      lpszRegKey,
                                      0,
                                      KEY_READ,
                                      &hkey))
    {
        DWORD cbSize;
        DWORD dwLCID = 0;
        cbSize = sizeof(dwLCID);

        // fail if this cache is not tagged with the UI language ID, or we are not in
        // the language ID that the cache was saved in.
        if (ERROR_SUCCESS != SHQueryValueEx(hkey, TEXT("Presentation LCID"),
                NULL, NULL, (LPBYTE) &dwLCID, &cbSize) || dwLCID != GetUserDefaultUILanguage())
        {
            RegCloseKey(hkey);
            return;
        }
        if (ERROR_SUCCESS == SHQueryValueEx(hkey, TEXT("Presentation Cache"),
                NULL, NULL, NULL, &cbSize))
        {
            lpData->pRegCPLBuffer = LocalAlloc(LPTR, cbSize);

            if (lpData->pRegCPLBuffer)
            {
                if (ERROR_SUCCESS == SHQueryValueEx(hkey, TEXT("Presentation Cache"),
                        NULL, NULL, lpData->pRegCPLBuffer, &cbSize))
                {
                    if (!_IsPresentationCachePostOctober2001(lpData->pRegCPLBuffer, cbSize))
                    {
                        TraceMsg(TF_WARNING, "CPLD_GetRegModules: Presentation cache pre Oct 2001.");
                        LocalFree(lpData->pRegCPLBuffer);
                        lpData->pRegCPLBuffer = NULL;
                    }
                    else
                    {
                        lpData->hRegCPLs = DPA_Create(4);
                        if (lpData->hRegCPLs)
                        {
                            REG_CPL_INFO * p;
                            DWORD cbOffset;

                            for (cbOffset = 0          ;
                                  cbOffset < cbSize     ;
                                  cbOffset += p->cbSize)
                            {
                                p = (REG_CPL_INFO *)&(lpData->pRegCPLBuffer[cbOffset]);
                                p->flags |= REGCPL_FROMREG;
                                DPA_AppendPtr(lpData->hRegCPLs, p);

                                //DebugMsg(DM_TRACE,"sh CPLD_GetRegModules: %s (%s)", REGCPL_FILENAME(p), REGCPL_CPLNAME(p));
                            }

                            lpData->cRegCPLs = DPA_GetPtrCount(lpData->hRegCPLs);
                        }
                    }
                }
                else
                {
                    TraceMsg(TF_WARNING, "CPLD_GetRegModules: failed read!");
                }
            } // Alloc
        } // SHQueryValueEx for size

        RegCloseKey(hkey);

    } // RegOpenKey
}


//
// On a typical system, we will successfully cache all the CPLs.  So this
// function will write out the data only once.
//

void CPLD_FlushRegModules(ControlData *lpData)
{
    if (lpData->fRegCPLChanged)
    {
        int         num = DPA_GetPtrCount(lpData->hRegCPLs);
        DWORD       cbSize = num * sizeof(REG_CPL_INFO);

        REG_CPL_INFO * prcpli = LocalAlloc(LPTR, cbSize);
        LPCTSTR lpszRegKey;

        if (IsOS(OS_WOW6432))
        {
            lpszRegKey = TEXT("Software\\Microsoft\\Windows\\CurrentVersion\\Controls Folder (Wow64)");
        }
        else
        {
            lpszRegKey = REGSTR_PATH_CONTROLSFOLDER;
        }

        if (prcpli)
        {
            REG_CPL_INFO * pDest;
            HKEY hkey;
            int i;

            //
            // 0<=i<=num && CPLs 0..i-1 have been copied to prcpli or skipped
            //

            for (i = 0, pDest = prcpli; i < num ;)
            {
                REG_CPL_INFO * p = DPA_GetPtr(lpData->hRegCPLs, i);
                int j;

                //
                // if any CPL in this module has a dynamic icon, we cannot cache
                // any of this module's CPLs.
                //
                // i<=j<=num && CPLs i..j-1 are in same module
                //

                for (j = i; j < num; j++)
                {
                    REG_CPL_INFO * q = DPA_GetPtr(lpData->hRegCPLs, j);

                    if (lstrcmp(REGCPL_FILENAME(p), REGCPL_FILENAME(q)))
                    {
                        // all CPLs in this module are okay, save 'em
                        break;
                    }

                    if (q->idIcon == 0)
                    {
                        TraceMsg(TF_GENERAL, "CPLD_FlushRegModules: SKIPPING %s (%s) [dynamic icon]",REGCPL_FILENAME(p),REGCPL_CPLNAME(p));

                        // this module has a dynamic icon, skip it
                        for (j++ ; j < num ; j++)
                        {
                            q = DPA_GetPtr(lpData->hRegCPLs, j);
                            if (lstrcmp(REGCPL_FILENAME(p), REGCPL_FILENAME(q)))
                                break;
                        }
                        i = j;
                        break;
                    }
                }

                // CPLs i..j-1 are in the same module and need to be saved
                // (if j<num, CPL j is in the next module)
                for (; i < j ; i++)
                {
                    p = DPA_GetPtr(lpData->hRegCPLs, i);

                    hmemcpy(pDest, p, p->cbSize);
                    //
                    // Set the post-Oct 2001 flag.
                    //
                    pDest->flags |= REGCPL_POST_102001;

                    pDest = (REG_CPL_INFO *)(((LPBYTE)pDest) + pDest->cbSize);
                    //DebugMsg(DM_TRACE,"CPLD_FlushRegModules: %s (%s)",REGCPL_FILENAME(p),REGCPL_CPLNAME(p));
                }
            } // for (i=0,pDest=prcpli


            // prcpli contains packed REG_CPL_INFO structures to save to the registry

            if (ERROR_SUCCESS == RegCreateKeyEx(HKEY_CURRENT_USER,
                                                lpszRegKey,
                                                0,
                                                NULL,
                                                REG_OPTION_NON_VOLATILE,
                                                KEY_WRITE,
                                                NULL,      // default security
                                                &hkey,
                                                NULL))
            {
                DWORD dwLCID;
                DWORD dwSize = sizeof(dwLCID);
                dwLCID = GetUserDefaultUILanguage();

                if (ERROR_SUCCESS != RegSetValueEx(hkey, TEXT("Presentation LCID"), 0, REG_DWORD, (LPBYTE) &dwLCID, dwSize))
                {
                    TraceMsg(TF_WARNING, "CPLD_FLushRegModules: failed to write the LCID!");
                }
                if (ERROR_SUCCESS != RegSetValueEx(hkey, TEXT("Presentation Cache"), 0, REG_BINARY, (LPBYTE)prcpli, (DWORD) ((LPBYTE)pDest-(LPBYTE)prcpli)))
                {
                    TraceMsg(TF_WARNING, "CPLD_FLushRegModules: failed write!");
                }
                RegCloseKey(hkey);
            }

            LocalFree((HLOCAL)prcpli);

            lpData->fRegCPLChanged = FALSE; // no longer dirty
        } // if (prcpli)
    } // if dirty
}


//---------------------------------------------------------------------------
void CPLD_Destroy(ControlData *lpData)
{
    int i;

    if (lpData->haminst)
    {
        for (i=DSA_GetItemCount(lpData->haminst)-1 ; i>=0 ; --i)
            _FreeCPLModuleHandle(DSA_GetItemPtr(lpData->haminst, i));

        DSA_Destroy(lpData->haminst);
    }

    if (lpData->hamiModule)
    {
        for (i=DSA_GetItemCount(lpData->hamiModule)-1 ; i>=0 ; --i)
        {
            PMODULEINFO pmi = DSA_GetItemPtr(lpData->hamiModule, i);

            Str_SetPtr(&pmi->pszModule, NULL);
        }

        DSA_Destroy(lpData->hamiModule);
    }

    if (lpData->hRegCPLs)
    {
        CPLD_FlushRegModules(lpData);

        for (i = DPA_GetPtrCount(lpData->hRegCPLs)-1 ; i >= 0 ; i--)
        {
            REG_CPL_INFO * p = DPA_GetPtr(lpData->hRegCPLs, i);
            if (!(p->flags & REGCPL_FROMREG))
                LocalFree((HLOCAL)p);
        }
        DPA_Destroy(lpData->hRegCPLs);
    }
    if (lpData->pRegCPLBuffer)
        LocalFree((HLOCAL)lpData->pRegCPLBuffer);
}


//
// Loads module lpData->hamiModule[nModule] and returns # cpls in module
int CPLD_InitModule(ControlData *lpData, int nModule, MINST *pminst)
{
    PMODULEINFO pmi;
    LPCPLMODULE pcplm;
    int iModule;

    pmi = DSA_GetItemPtr(lpData->hamiModule, nModule);

    if (pmi == NULL)
    {
        TraceMsg(TF_WARNING, "CPLD_InitModule: DSA returned NULL structure");
        return 0;
    }

    iModule = _LoadCPLModuleAndAdd(lpData, pmi->pszModule);

    if (iModule < 0)
    {
        return(0);
    }

    pcplm = DSA_GetItemPtr(g_hacplmLoaded, iModule);
    *pminst = pcplm->minst;

    return DSA_GetItemCount(pcplm->hacpli);
}

BOOL CPLD_AddControlToReg(ControlData *lpData, const MINST * pminst, int nControl)
{
    int iModule;
    LPCPLMODULE pcplm;
    LPCPLITEM  pcpli = NULL;

    TCHAR buf[MAX_PATH];
    HANDLE hFindFile;
    WIN32_FIND_DATA findData;

    iModule = _FindCPLModule(pminst);
    if (iModule >= 0)
    {
        pcplm = DSA_GetItemPtr(g_hacplmLoaded, iModule);
        if (pcplm != NULL)
            pcpli = DSA_GetItemPtr(pcplm->hacpli, nControl);
    }
    if (pcpli == NULL)
        return FALSE;

    //
    // PERF: Why are we using GetModuleFileName instead of the name
    // of the file we used to load this module?  (We have the name both
    // in the calling function and in lpData.)
    //

    GetModuleFileName(pcplm->minst.hinst, buf, MAX_PATH);

    if (*buf != 0)
        hFindFile = FindFirstFile(buf, &findData);
    else
        hFindFile = INVALID_HANDLE_VALUE;

    if (hFindFile != INVALID_HANDLE_VALUE)
    {
        REG_CPL_INFO * prcpli = LocalAlloc(LPTR, sizeof(REG_CPL_INFO));

        FindClose(hFindFile);

        if (prcpli)
        {
            if (SUCCEEDED(StringCchCopy(REGCPL_FILENAME(prcpli), MAX_PATH, buf)))
            {
                prcpli->flags = FALSE;
                prcpli->ftCreationTime = findData.ftCreationTime;
                prcpli->nFileSizeHigh = findData.nFileSizeHigh;
                prcpli->nFileSizeLow = findData.nFileSizeLow;

                prcpli->idIcon = pcpli->idIcon;

                prcpli->oName = lstrlen(REGCPL_FILENAME(prcpli)) + 1;
                //
                // We don't check return values from StringCchCopy because we
                // don't care if the CPL display name or info text are truncated.
                // We do care that the file name is complete (above).
                //
                StringCchCopy(REGCPL_CPLNAME(prcpli),  MAX_CCH_CPLNAME, pcpli->pszName);

                prcpli->oInfo = prcpli->oName + lstrlen(REGCPL_CPLNAME(prcpli)) + 1;

                StringCchCopy(REGCPL_CPLINFO(prcpli), MAX_CCH_CPLINFO, pcpli->pszInfo);

                prcpli->cbSize = FIELD_OFFSET(REG_CPL_INFO, buf) + (prcpli->oInfo
                                                + lstrlen(REGCPL_CPLINFO(prcpli))
                                                + 1) * sizeof(TCHAR);

                //
                // Force struct size to be DWORD aligned since these are packed
                // together in registry, then read and accessed after reading
                // cache from registry.
                //

                if (prcpli->cbSize & 3)
                    prcpli->cbSize += sizeof(DWORD) - (prcpli->cbSize & 3);

                if (!lpData->hRegCPLs)
                {
                    lpData->hRegCPLs = DPA_Create(4);
                }
                if (lpData->hRegCPLs)
                {
                    DPA_AppendPtr(lpData->hRegCPLs, prcpli);

                    //
                    // don't update cRegCPLs.  We don't need it any more, and
                    // it is also the upper-end counter for ESF_Next registry enum.
                    //lpData->cRegCPLs++;
                    //

                    lpData->fRegCPLChanged = TRUE;
                }
                else
                    LocalFree((HLOCAL)prcpli);
            }
        }
    }
    return TRUE;
}