source: trunk/src/ole32/compobj.c@ 10367

/*
 *      COMPOBJ library
 *
 *      Copyright 1995  Martin von Loewis
 *      Copyright 1998  Justin Bradford
 *      Copyright 1999  Francis Beaudet
 *  Copyright 1999  Sylvain St-Germain
 *  Copyright 2002  Marcus Meissner
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>

#include "windef.h"
#include "objbase.h"
#include "ole2.h"
#include "ole2ver.h"
#include "rpc.h"
#include "winerror.h"
#include "winreg.h"
#include "wownt32.h"
#include "wtypes.h"
#include "wine/unicode.h"
#include "wine/obj_base.h"
#include "wine/obj_clientserver.h"
#include "wine/obj_misc.h"
#include "wine/obj_marshal.h"
#include "wine/obj_storage.h"
#include "wine/obj_channel.h"
#include "compobj_private.h"

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(ole);

/****************************************************************************
 * This section defines variables internal to the COM module.
 *
 * TODO: Most of these things will have to be made thread-safe.
 */
HINSTANCE       COMPOBJ_hInstance32 = 0;

static HRESULT COM_GetRegisteredClassObject(REFCLSID rclsid, DWORD dwClsContext, LPUNKNOWN*  ppUnk);
static void COM_RevokeAllClasses();
static void COM_ExternalLockFreeList();

/*****************************************************************************
 * Appartment management stuff
 *
 * NOTE:
 *  per Thread values are stored in the TEB on offset 0xF80
 *
 *  see www.microsoft.com/msj/1099/bugslayer/bugslayer1099.htm
 *
 */

typedef struct {
        unsigned char           threadingModell;        /* we use the COINIT flags */
        unsigned long           threadID;
        long                    AppartmentLockCount;
} OleAppartmentData;

typedef struct {
        OleAppartmentData       *AppartmentData;
} OleThreadData;

/* not jet used
static CRITICAL_SECTION csAppartmentData = CRITICAL_SECTION_INIT("csAppartmentData");
*/
/*
 * the first STA created in a process is the main STA
 */

/* not jet used
static OleAppartmentData * mainSTA;
*/

/*
 * a Process can only have one MTA
 */

/* not jet used
static OleAppartmentData * processMTA;
*/


/*
 * This lock count counts the number of times CoInitialize is called. It is
 * decreased every time CoUninitialize is called. When it hits 0, the COM
 * libraries are freed
 */
static LONG s_COMLockCount = 0;

/*
 * This linked list contains the list of registered class objects. These
 * are mostly used to register the factories for out-of-proc servers of OLE
 * objects.
 *
 * TODO: Make this data structure aware of inter-process communication. This
 *       means that parts of this will be exported to the Wine Server.
 */
typedef struct tagRegisteredClass
{
  CLSID     classIdentifier;
  LPUNKNOWN classObject;
  DWORD     runContext;
  DWORD     connectFlags;
  DWORD     dwCookie;
  HANDLE    hThread; /* only for localserver */
  struct tagRegisteredClass* nextClass;
} RegisteredClass;

static CRITICAL_SECTION csRegisteredClassList = CRITICAL_SECTION_INIT("csRegisteredClassList");
static RegisteredClass* firstRegisteredClass = NULL;

/*****************************************************************************
 * This section contains OpenDllList definitions
 *
 * The OpenDllList contains only handles of dll loaded by CoGetClassObject or
 * other functions what do LoadLibrary _without_ giving back a HMODULE.
 * Without this list these handles would be freed never.
 *
 * FIXME: a DLL what says OK whenn asked for unloading is unloaded in the
 * next unload-call but not before 600 sec.
 */

typedef struct tagOpenDll {
  HINSTANCE hLibrary;
  struct tagOpenDll *next;
} OpenDll;

static CRITICAL_SECTION csOpenDllList = CRITICAL_SECTION_INIT("csOpenDllList");
static OpenDll *openDllList = NULL; /* linked list of open dlls */

static void COMPOBJ_DLLList_Add(HANDLE hLibrary);
static void COMPOBJ_DllList_FreeUnused(int Timeout);


/******************************************************************************
 * Initialize/Uninitialize critical sections.
 */
void COMPOBJ_InitProcess( void )
{
}

void COMPOBJ_UninitProcess( void )
{
}

/*****************************************************************************
 * This section contains OpenDllList implemantation
 */

static void COMPOBJ_DLLList_Add(HANDLE hLibrary)
{
    OpenDll *ptr;
    OpenDll *tmp;

    TRACE("\n");

    EnterCriticalSection( &csOpenDllList );

    if (openDllList == NULL) {
        /* empty list -- add first node */
        openDllList = (OpenDll*)HeapAlloc(GetProcessHeap(),0, sizeof(OpenDll));
        openDllList->hLibrary=hLibrary;
        openDllList->next = NULL;
    } else {
        /* search for this dll */
        int found = FALSE;
        for (ptr = openDllList; ptr->next != NULL; ptr=ptr->next) {
            if (ptr->hLibrary == hLibrary) {
                found = TRUE;
                break;
            }
        }
        if (!found) {
            /* dll not found, add it */
            tmp = openDllList;
            openDllList = (OpenDll*)HeapAlloc(GetProcessHeap(),0, sizeof(OpenDll));
            openDllList->hLibrary = hLibrary;
            openDllList->next = tmp;
        }
    }

    LeaveCriticalSection( &csOpenDllList );
}

static void COMPOBJ_DllList_FreeUnused(int Timeout)
{
    OpenDll *curr, *next, *prev = NULL;
    typedef HRESULT(*DllCanUnloadNowFunc)(void);
    DllCanUnloadNowFunc DllCanUnloadNow;

    TRACE("\n");

    EnterCriticalSection( &csOpenDllList );

    for (curr = openDllList; curr != NULL; ) {
        DllCanUnloadNow = (DllCanUnloadNowFunc) GetProcAddress(curr->hLibrary, "DllCanUnloadNow");

        if ( (DllCanUnloadNow != NULL) && (DllCanUnloadNow() == S_OK) ) {
            next = curr->next;

            TRACE("freeing 0x%08x\n", curr->hLibrary);
            FreeLibrary(curr->hLibrary);

            HeapFree(GetProcessHeap(), 0, curr);
            if (curr == openDllList) {
                openDllList = next;
            } else {
              prev->next = next;
            }

            curr = next;
        } else {
            prev = curr;
            curr = curr->next;
        }
    }

    LeaveCriticalSection( &csOpenDllList );
}

/******************************************************************************
 *           CoBuildVersion [COMPOBJ.1]
 *           CoBuildVersion [OLE32.4]
 *
 * RETURNS
 *      Current build version, hiword is majornumber, loword is minornumber
 */
DWORD WINAPI CoBuildVersion(void)
{
    TRACE("Returning version %d, build %d.\n", rmm, rup);
    return (rmm<<16)+rup;
}

/******************************************************************************
 *              CoInitialize    [OLE32.26]
 *
 * Initializes the COM libraries.
 *
 * See CoInitializeEx
 */
HRESULT WINAPI CoInitialize(
        LPVOID lpReserved       /* [in] pointer to win32 malloc interface
                                   (obsolete, should be NULL) */
)
{
  /*
   * Just delegate to the newer method.
   */
  return CoInitializeEx(lpReserved, COINIT_APARTMENTTHREADED);
}

/******************************************************************************
 *              CoInitializeEx  [OLE32.163]
 *
 * Initializes the COM libraries. The behavior used to set the win32 IMalloc
 * used for memory management is obsolete.
 *
 * RETURNS
 *  S_OK               if successful,
 *  S_FALSE            if this function was called already.
 *  RPC_E_CHANGED_MODE if a previous call to CoInitialize specified another
 *                      threading model.
 *
 * BUGS
 * Only the single threaded model is supported. As a result RPC_E_CHANGED_MODE
 * is never returned.
 *
 * See the windows documentation for more details.
 */
HRESULT WINAPI CoInitializeEx(
        LPVOID lpReserved,      /* [in] pointer to win32 malloc interface
                                   (obsolete, should be NULL) */
        DWORD dwCoInit          /* [in] A value from COINIT specifies the threading model */
)
{
  HRESULT hr;

  TRACE("(%p, %x)\n", lpReserved, (int)dwCoInit);

  if (lpReserved!=NULL)
  {
    ERR("(%p, %x) - Bad parameter passed-in %p, must be an old Windows Application\n", lpReserved, (int)dwCoInit, lpReserved);
  }

  /*
   * Check for unsupported features.
   */
  if (dwCoInit!=COINIT_APARTMENTTHREADED)
  {
    FIXME(":(%p,%x): unsupported flag %x\n", lpReserved, (int)dwCoInit, (int)dwCoInit);
    /* Hope for the best and continue anyway */
  }

  /*
   * Check the lock count. If this is the first time going through the initialize
   * process, we have to initialize the libraries.
   *
   * And crank-up that lock count.
   */
  if (InterlockedExchangeAdd(&s_COMLockCount,1)==0)
  {
    /*
     * Initialize the various COM libraries and data structures.
     */
    TRACE("() - Initializing the COM libraries\n");


    RunningObjectTableImpl_Initialize();

    hr = S_OK;
  }
  else
    hr = S_FALSE;

  return hr;
}

/***********************************************************************
 *           CoUninitialize   [OLE32.47]
 *
 * This method will release the COM libraries.
 *
 * See the windows documentation for more details.
 */
void WINAPI CoUninitialize(void)
{
  LONG lCOMRefCnt;
  TRACE("()\n");

  /*
   * Decrease the reference count.
   * If we are back to 0 locks on the COM library, make sure we free
   * all the associated data structures.
   */
  lCOMRefCnt = InterlockedExchangeAdd(&s_COMLockCount,-1);
  if (lCOMRefCnt==1)
  {
    /*
     * Release the various COM libraries and data structures.
     */
    TRACE("() - Releasing the COM libraries\n");

    RunningObjectTableImpl_UnInitialize();
    /*
     * Release the references to the registered class objects.
     */
    COM_RevokeAllClasses();

    /*
     * This will free the loaded COM Dlls.
     */
    CoFreeAllLibraries();

    /*
     * This will free list of external references to COM objects.
     */
    COM_ExternalLockFreeList();

  }
  else if (lCOMRefCnt<1) {
    ERR( "CoUninitialize() - not CoInitialized.\n" );
    InterlockedExchangeAdd(&s_COMLockCount,1); /* restore the lock count. */
  }
}

/******************************************************************************
 *              CoDisconnectObject      [COMPOBJ.15]
 *              CoDisconnectObject      [OLE32.8]
 */
HRESULT WINAPI CoDisconnectObject( LPUNKNOWN lpUnk, DWORD reserved )
{
    TRACE("(%p, %lx)\n",lpUnk,reserved);
    return S_OK;
}

/******************************************************************************
 *              CoCreateGuid[OLE32.6]
 *
 */
HRESULT WINAPI CoCreateGuid(
        GUID *pguid /* [out] points to the GUID to initialize */
) {
    return UuidCreate(pguid);
}

/******************************************************************************
 *              CLSIDFromString [OLE32.3]
 *              IIDFromString   [OLE32.74]
 * Converts a unique identifier from its string representation into
 * the GUID struct.
 *
 * UNDOCUMENTED
 *      If idstr is not a valid CLSID string then it gets treated as a ProgID
 *
 * RETURNS
 *      the converted GUID
 */
HRESULT WINAPI __CLSIDFromStringA(
        LPCSTR idstr,           /* [in] string representation of guid */
        CLSID *id)              /* [out] GUID converted from string */
{
  BYTE *s = (BYTE *) idstr;
  int   i;
  BYTE table[256];

  if (!s)
          s = "{00000000-0000-0000-0000-000000000000}";
  else {  /* validate the CLSID string */

      if (strlen(s) != 38)
          return CO_E_CLASSSTRING;

      if ((s[0]!='{') || (s[9]!='-') || (s[14]!='-') || (s[19]!='-') || (s[24]!='-') || (s[37]!='}'))
          return CO_E_CLASSSTRING;

      for (i=1; i<37; i++) {
          if ((i == 9)||(i == 14)||(i == 19)||(i == 24)) continue;
          if (!(((s[i] >= '0') && (s[i] <= '9'))  ||
                ((s[i] >= 'a') && (s[i] <= 'f'))  ||
                ((s[i] >= 'A') && (s[i] <= 'F'))))
              return CO_E_CLASSSTRING;
      }
  }

  TRACE("%s -> %p\n", s, id);

  /* quick lookup table */
  memset(table, 0, 256);

  for (i = 0; i < 10; i++) {
    table['0' + i] = i;
  }
  for (i = 0; i < 6; i++) {
    table['A' + i] = i+10;
    table['a' + i] = i+10;
  }

  /* in form {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX} */

  id->Data1 = (table[s[1]] << 28 | table[s[2]] << 24 | table[s[3]] << 20 | table[s[4]] << 16 |
               table[s[5]] << 12 | table[s[6]] << 8  | table[s[7]] << 4  | table[s[8]]);
  id->Data2 = table[s[10]] << 12 | table[s[11]] << 8 | table[s[12]] << 4 | table[s[13]];
  id->Data3 = table[s[15]] << 12 | table[s[16]] << 8 | table[s[17]] << 4 | table[s[18]];

  /* these are just sequential bytes */
  id->Data4[0] = table[s[20]] << 4 | table[s[21]];
  id->Data4[1] = table[s[22]] << 4 | table[s[23]];
  id->Data4[2] = table[s[25]] << 4 | table[s[26]];
  id->Data4[3] = table[s[27]] << 4 | table[s[28]];
  id->Data4[4] = table[s[29]] << 4 | table[s[30]];
  id->Data4[5] = table[s[31]] << 4 | table[s[32]];
  id->Data4[6] = table[s[33]] << 4 | table[s[34]];
  id->Data4[7] = table[s[35]] << 4 | table[s[36]];

  return S_OK;
}

/*****************************************************************************/

HRESULT WINAPI CLSIDFromString(
        LPCOLESTR idstr,        /* [in] string representation of GUID */
        CLSID *id )             /* [out] GUID represented by above string */
{
    char xid[40];
    HRESULT ret;

    if (!WideCharToMultiByte( CP_ACP, 0, idstr, -1, xid, sizeof(xid), NULL, NULL ))
        return CO_E_CLASSSTRING;


    ret = __CLSIDFromStringA(xid,id);
    if(ret != S_OK) { /* It appears a ProgID is also valid */
        ret = CLSIDFromProgID(idstr, id);
    }
    return ret;
}

/******************************************************************************
 *              WINE_StringFromCLSID    [Internal]
 * Converts a GUID into the respective string representation.
 *
 * NOTES
 *
 * RETURNS
 *      the string representation and HRESULT
 */
HRESULT WINE_StringFromCLSID(
        const CLSID *id,        /* [in] GUID to be converted */
        LPSTR idstr             /* [out] pointer to buffer to contain converted guid */
) {
  static const char *hex = "0123456789ABCDEF";
  char *s;
  int   i;

  if (!id)
        { ERR("called with id=Null\n");
          *idstr = 0x00;
          return E_FAIL;
        }

  sprintf(idstr, "{%08lX-%04X-%04X-%02X%02X-",
          id->Data1, id->Data2, id->Data3,
          id->Data4[0], id->Data4[1]);
  s = &idstr[25];

  /* 6 hex bytes */
  for (i = 2; i < 8; i++) {
    *s++ = hex[id->Data4[i]>>4];
    *s++ = hex[id->Data4[i] & 0xf];
  }

  *s++ = '}';
  *s++ = '\0';

  TRACE("%p->%s\n", id, idstr);

  return S_OK;
}


/******************************************************************************
 *              StringFromCLSID [OLE32.151]
 *              StringFromIID   [OLE32.153]
 * Converts a GUID into the respective string representation.
 * The target string is allocated using the OLE IMalloc.
 * RETURNS
 *      the string representation and HRESULT
 */
HRESULT WINAPI StringFromCLSID(
        REFCLSID id,            /* [in] the GUID to be converted */
        LPOLESTR *idstr /* [out] a pointer to a to-be-allocated pointer pointing to the resulting string */
) {
        char            buf[80];
        HRESULT       ret;
        LPMALLOC        mllc;

        if ((ret=CoGetMalloc(0,&mllc)))
                return ret;

        ret=WINE_StringFromCLSID(id,buf);
        if (!ret) {
            DWORD len = MultiByteToWideChar( CP_ACP, 0, buf, -1, NULL, 0 );
            *idstr = IMalloc_Alloc( mllc, len * sizeof(WCHAR) );
            MultiByteToWideChar( CP_ACP, 0, buf, -1, *idstr, len );
        }
        return ret;
}

/******************************************************************************
 *              StringFromGUID2 [COMPOBJ.76]
 *              StringFromGUID2 [OLE32.152]
 *
 * Converts a global unique identifier into a string of an API-
 * specified fixed format. (The usual {.....} stuff.)
 *
 * RETURNS
 *      The (UNICODE) string representation of the GUID in 'str'
 *      The length of the resulting string, 0 if there was any problem.
 */
INT WINAPI
StringFromGUID2(REFGUID id, LPOLESTR str, INT cmax)
{
  char          xguid[80];

  if (WINE_StringFromCLSID(id,xguid))
        return 0;
  return MultiByteToWideChar( CP_ACP, 0, xguid, -1, str, cmax );
}

/******************************************************************************
 * ProgIDFromCLSID [OLE32.133]
 * Converts a class id into the respective Program ID. (By using a registry lookup)
 * RETURNS S_OK on success
 * riid associated with the progid
 */

HRESULT WINAPI ProgIDFromCLSID(
  REFCLSID clsid, /* [in] class id as found in registry */
  LPOLESTR *lplpszProgID/* [out] associated Prog ID */
)
{
  char     strCLSID[50], *buf, *buf2;
  DWORD    buf2len;
  HKEY     xhkey;
  LPMALLOC mllc;
  HRESULT  ret = S_OK;

  WINE_StringFromCLSID(clsid, strCLSID);

  buf = HeapAlloc(GetProcessHeap(), 0, strlen(strCLSID)+14);
  sprintf(buf,"CLSID\\%s\\ProgID", strCLSID);
  if (RegOpenKeyA(HKEY_CLASSES_ROOT, buf, &xhkey))
    ret = REGDB_E_CLASSNOTREG;

  HeapFree(GetProcessHeap(), 0, buf);

  if (ret == S_OK)
  {
    buf2 = HeapAlloc(GetProcessHeap(), 0, 255);
    buf2len = 255;
    if (RegQueryValueA(xhkey, NULL, buf2, &buf2len))
      ret = REGDB_E_CLASSNOTREG;

    if (ret == S_OK)
    {
      if (CoGetMalloc(0,&mllc))
        ret = E_OUTOFMEMORY;
      else
      {
          DWORD len = MultiByteToWideChar( CP_ACP, 0, buf2, -1, NULL, 0 );
          *lplpszProgID = IMalloc_Alloc(mllc, len * sizeof(WCHAR) );
          MultiByteToWideChar( CP_ACP, 0, buf2, -1, *lplpszProgID, len );
      }
    }
    HeapFree(GetProcessHeap(), 0, buf2);
  }

  RegCloseKey(xhkey);
  return ret;
}

/******************************************************************************
 *              CLSIDFromProgID [OLE32.2]
 * Converts a program id into the respective GUID. (By using a registry lookup)
 * RETURNS
 *      riid associated with the progid
 */
HRESULT WINAPI CLSIDFromProgID(
        LPCOLESTR progid,       /* [in] program id as found in registry */
        LPCLSID riid )          /* [out] associated CLSID */
{
    static const WCHAR clsidW[] = { '\\','C','L','S','I','D',0 };
    char buf2[80];
    DWORD buf2len = sizeof(buf2);
    HKEY xhkey;

    WCHAR *buf = HeapAlloc( GetProcessHeap(),0,(strlenW(progid)+8) * sizeof(WCHAR) );
    strcpyW( buf, progid );
    strcatW( buf, clsidW );
    if (RegOpenKeyW(HKEY_CLASSES_ROOT,buf,&xhkey))
    {
        HeapFree(GetProcessHeap(),0,buf);
        return CO_E_CLASSSTRING;
    }
    HeapFree(GetProcessHeap(),0,buf);

    if (RegQueryValueA(xhkey,NULL,buf2,&buf2len))
    {
        RegCloseKey(xhkey);
        return CO_E_CLASSSTRING;
    }
    RegCloseKey(xhkey);
    return __CLSIDFromStringA(buf2,riid);
}



/*****************************************************************************
 *             CoGetPSClsid [OLE32.22]
 *
 * This function returns the CLSID of the DLL that implements the proxy and stub
 * for the specified interface.
 *
 * It determines this by searching the
 * HKEY_CLASSES_ROOT\Interface\{string form of riid}\ProxyStubClsid32 in the registry
 * and any interface id registered by CoRegisterPSClsid within the current process.
 *
 * FIXME: We only search the registry, not ids registered with CoRegisterPSClsid.
 */
HRESULT WINAPI CoGetPSClsid(
          REFIID riid,     /* [in]  Interface whose proxy/stub CLSID is to be returned */
          CLSID *pclsid )    /* [out] Where to store returned proxy/stub CLSID */
{
    char *buf, buf2[40];
    DWORD buf2len;
    HKEY xhkey;

    TRACE("() riid=%s, pclsid=%p\n", debugstr_guid(riid), pclsid);

    /* Get the input iid as a string */
    WINE_StringFromCLSID(riid, buf2);
    /* Allocate memory for the registry key we will construct.
       (length of iid string plus constant length of static text */
    buf = HeapAlloc(GetProcessHeap(), 0, strlen(buf2)+27);
    if (buf == NULL)
    {
       return (E_OUTOFMEMORY);
    }

    /* Construct the registry key we want */
    sprintf(buf,"Interface\\%s\\ProxyStubClsid32", buf2);

    /* Open the key.. */
    if (RegOpenKeyA(HKEY_CLASSES_ROOT, buf, &xhkey))
    {
       HeapFree(GetProcessHeap(),0,buf);
       return (E_INVALIDARG);
    }
    HeapFree(GetProcessHeap(),0,buf);

    /* ... Once we have the key, query the registry to get the
       value of CLSID as a string, and convert it into a
       proper CLSID structure to be passed back to the app */
    buf2len = sizeof(buf2);
    if ( (RegQueryValueA(xhkey,NULL,buf2,&buf2len)) )
    {
       RegCloseKey(xhkey);
       return E_INVALIDARG;
    }
    RegCloseKey(xhkey);

    /* We have the CLSid we want back from the registry as a string, so
       lets convert it into a CLSID structure */
    if ( (__CLSIDFromStringA(buf2,pclsid)) != NOERROR) {
       return E_INVALIDARG;
    }

    TRACE ("() Returning CLSID=%s\n", debugstr_guid(pclsid));
    return (S_OK);
}



/***********************************************************************
 *              WriteClassStm (OLE32.159)
 *
 * This function write a CLSID on stream
 */
HRESULT WINAPI WriteClassStm(IStream *pStm,REFCLSID rclsid)
{
    TRACE("(%p,%p)\n",pStm,rclsid);

    if (rclsid==NULL)
        return E_INVALIDARG;

    return IStream_Write(pStm,rclsid,sizeof(CLSID),NULL);
}

/***********************************************************************
 *              ReadClassStm (OLE32.135)
 *
 * This function read a CLSID from a stream
 */
HRESULT WINAPI ReadClassStm(IStream *pStm,CLSID *pclsid)
{
    ULONG nbByte;
    HRESULT res;

    TRACE("(%p,%p)\n",pStm,pclsid);

    if (pclsid==NULL)
        return E_INVALIDARG;

    res = IStream_Read(pStm,(void*)pclsid,sizeof(CLSID),&nbByte);

    if (FAILED(res))
        return res;

    if (nbByte != sizeof(CLSID))
        return S_FALSE;
    else
        return S_OK;
}


/***
 * COM_GetRegisteredClassObject
 *
 * This internal method is used to scan the registered class list to
 * find a class object.
 *
 * Params:
 *   rclsid        Class ID of the class to find.
 *   dwClsContext  Class context to match.
 *   ppv           [out] returns a pointer to the class object. Complying
 *                 to normal COM usage, this method will increase the
 *                 reference count on this object.
 */
static HRESULT COM_GetRegisteredClassObject(
        REFCLSID    rclsid,
        DWORD       dwClsContext,
        LPUNKNOWN*  ppUnk)
{
  HRESULT hr = S_FALSE;
  RegisteredClass* curClass;

  EnterCriticalSection( &csRegisteredClassList );

  /*
   * Sanity check
   */
  assert(ppUnk!=0);

  /*
   * Iterate through the whole list and try to match the class ID.
   */
  curClass = firstRegisteredClass;

  while (curClass != 0)
  {
    /*
     * Check if we have a match on the class ID.
     */
    if (IsEqualGUID(&(curClass->classIdentifier), rclsid))
    {
      /*
       * Since we don't do out-of process or DCOM just right away, let's ignore the
       * class context.
       */

      /*
       * We have a match, return the pointer to the class object.
       */
      *ppUnk = curClass->classObject;

      IUnknown_AddRef(curClass->classObject);

      hr = S_OK;
      goto end;
    }

    /*
     * Step to the next class in the list.
     */
    curClass = curClass->nextClass;
  }

end:
  LeaveCriticalSection( &csRegisteredClassList );
  /*
   * If we get to here, we haven't found our class.
   */
  return hr;
}

static DWORD WINAPI
_LocalServerThread(LPVOID param) {
    HANDLE              hPipe;
    char                pipefn[200];
    RegisteredClass *newClass = (RegisteredClass*)param;
    HRESULT             hres;
    IStream             *pStm;
    STATSTG             ststg;
    unsigned char       *buffer;
    int                 buflen;
    IClassFactory       *classfac;
    LARGE_INTEGER       seekto;
    ULARGE_INTEGER      newpos;
    ULONG               res;

    TRACE("Starting threader for %s.\n",debugstr_guid(&newClass->classIdentifier));
    strcpy(pipefn,PIPEPREF);
    WINE_StringFromCLSID(&newClass->classIdentifier,pipefn+strlen(PIPEPREF));

    hres = IUnknown_QueryInterface(newClass->classObject,&IID_IClassFactory,(LPVOID*)&classfac);
    if (hres) return hres;

    hres = CreateStreamOnHGlobal(0,TRUE,&pStm);
    if (hres) {
        FIXME("Failed to create stream on hglobal.\n");
        return hres;
    }
    hres = CoMarshalInterface(pStm,&IID_IClassFactory,(LPVOID)classfac,0,NULL,0);
    if (hres) {
        FIXME("CoMarshalInterface failed, %lx!\n",hres);
        return hres;
    }
    hres = IStream_Stat(pStm,&ststg,0);
    if (hres) return hres;

    buflen = ststg.cbSize.s.LowPart;
    buffer = HeapAlloc(GetProcessHeap(),0,buflen);
    seekto.s.LowPart = 0;
    seekto.s.HighPart = 0;
    hres = IStream_Seek(pStm,seekto,SEEK_SET,&newpos);
    if (hres) {
        FIXME("IStream_Seek failed, %lx\n",hres);
        return hres;
    }
    hres = IStream_Read(pStm,buffer,buflen,&res);
    if (hres) {
        FIXME("Stream Read failed, %lx\n",hres);
        return hres;
    }
    IStream_Release(pStm);

    while (1) {
        hPipe = CreateNamedPipeA(
            pipefn,
            PIPE_ACCESS_DUPLEX,
            PIPE_TYPE_BYTE|PIPE_WAIT,
            PIPE_UNLIMITED_INSTANCES,
            4096,
            4096,
            NMPWAIT_USE_DEFAULT_WAIT,
            NULL
        );
        if (hPipe == INVALID_HANDLE_VALUE) {
            FIXME("pipe creation failed for %s, le is %lx\n",pipefn,GetLastError());
            return 1;
        }
        if (!ConnectNamedPipe(hPipe,NULL)) {
            ERR("Failure during ConnectNamedPipe %lx, ABORT!\n",GetLastError());
            CloseHandle(hPipe);
            continue;
        }
        WriteFile(hPipe,buffer,buflen,&res,NULL);
        CloseHandle(hPipe);
    }
    return 0;
}

/******************************************************************************
 *              CoRegisterClassObject   [OLE32.36]
 *
 * This method will register the class object for a given class ID.
 *
 * See the Windows documentation for more details.
 */
HRESULT WINAPI CoRegisterClassObject(
        REFCLSID rclsid,
        LPUNKNOWN pUnk,
        DWORD dwClsContext, /* [in] CLSCTX flags indicating the context in which to run the executable */
        DWORD flags,        /* [in] REGCLS flags indicating how connections are made */
        LPDWORD lpdwRegister
)
{
  RegisteredClass* newClass;
  LPUNKNOWN        foundObject;
  HRESULT          hr;

  TRACE("(%s,%p,0x%08lx,0x%08lx,%p)\n",
        debugstr_guid(rclsid),pUnk,dwClsContext,flags,lpdwRegister);

  if ( (lpdwRegister==0) || (pUnk==0) )
    return E_INVALIDARG;

  *lpdwRegister = 0;

  /*
   * First, check if the class is already registered.
   * If it is, this should cause an error.
   */
  hr = COM_GetRegisteredClassObject(rclsid, dwClsContext, &foundObject);
  if (hr == S_OK) {
    IUnknown_Release(foundObject);
    return CO_E_OBJISREG;
  }

  newClass = HeapAlloc(GetProcessHeap(), 0, sizeof(RegisteredClass));
  if ( newClass == NULL )
    return E_OUTOFMEMORY;

  EnterCriticalSection( &csRegisteredClassList );

  newClass->classIdentifier = *rclsid;
  newClass->runContext      = dwClsContext;
  newClass->connectFlags    = flags;
  /*
   * Use the address of the chain node as the cookie since we are sure it's
   * unique.
   */
  newClass->dwCookie        = (DWORD)newClass;
  newClass->nextClass       = firstRegisteredClass;

  /*
   * Since we're making a copy of the object pointer, we have to increase its
   * reference count.
   */
  newClass->classObject     = pUnk;
  IUnknown_AddRef(newClass->classObject);

  firstRegisteredClass = newClass;
  LeaveCriticalSection( &csRegisteredClassList );

  *lpdwRegister = newClass->dwCookie;

  if (dwClsContext & CLSCTX_LOCAL_SERVER) {
      DWORD tid;

      STUBMGR_Start();
      newClass->hThread=CreateThread(NULL,0,_LocalServerThread,newClass,0,&tid);
  }
  return S_OK;
}

/***********************************************************************
 *           CoRevokeClassObject [OLE32.40]
 *
 * This method will remove a class object from the class registry
 *
 * See the Windows documentation for more details.
 */
HRESULT WINAPI CoRevokeClassObject(
        DWORD dwRegister)
{
  HRESULT hr = E_INVALIDARG;
  RegisteredClass** prevClassLink;
  RegisteredClass*  curClass;

  TRACE("(%08lx)\n",dwRegister);

  EnterCriticalSection( &csRegisteredClassList );

  /*
   * Iterate through the whole list and try to match the cookie.
   */
  curClass      = firstRegisteredClass;
  prevClassLink = &firstRegisteredClass;

  while (curClass != 0)
  {
    /*
     * Check if we have a match on the cookie.
     */
    if (curClass->dwCookie == dwRegister)
    {
      /*
       * Remove the class from the chain.
       */
      *prevClassLink = curClass->nextClass;

      /*
       * Release the reference to the class object.
       */
      IUnknown_Release(curClass->classObject);

      /*
       * Free the memory used by the chain node.
       */
      HeapFree(GetProcessHeap(), 0, curClass);

      hr = S_OK;
      goto end;
    }

    /*
     * Step to the next class in the list.
     */
    prevClassLink = &(curClass->nextClass);
    curClass      = curClass->nextClass;
  }

end:
  LeaveCriticalSection( &csRegisteredClassList );
  /*
   * If we get to here, we haven't found our class.
   */
  return hr;
}

/***********************************************************************
 *      compobj_RegReadPath     [internal]
 *
 *      Reads a registry value and expands it when nessesary
 */
HRESULT compobj_RegReadPath(char * keyname, char * valuename, char * dst, int dstlen)
{
        HRESULT hres;
        HKEY key;
        DWORD keytype;
        char src[MAX_PATH];
        DWORD dwLength = dstlen;

        if((hres = RegOpenKeyExA(HKEY_CLASSES_ROOT, keyname, 0, KEY_READ, &key)) == ERROR_SUCCESS) {
          if( (hres = RegQueryValueExA(key, NULL, NULL, &keytype, (LPBYTE)src, &dwLength)) == ERROR_SUCCESS ) {
            if (keytype == REG_EXPAND_SZ) {
              if (dstlen <= ExpandEnvironmentStringsA(src, dst, dstlen)) hres = ERROR_MORE_DATA;
            } else {
              strncpy(dst, src, dstlen);
            }
          }
          RegCloseKey (key);
        }
        return hres;
}

/***********************************************************************
 *           CoGetClassObject [COMPOBJ.7]
 *           CoGetClassObject [OLE32.16]
 *
 * FIXME.  If request allows of several options and there is a failure
 *         with one (other than not being registered) do we try the
 *         others or return failure?  (E.g. inprocess is registered but
 *         the DLL is not found but the server version works)
 */
HRESULT WINAPI CoGetClassObject(
    REFCLSID rclsid, DWORD dwClsContext, COSERVERINFO *pServerInfo,
    REFIID iid, LPVOID *ppv
) {
    LPUNKNOWN   regClassObject;
    HRESULT     hres = E_UNEXPECTED;
    char        xclsid[80];
    HINSTANCE hLibrary;
#ifdef __WIN32OS2__
    typedef HRESULT (* CALLBACK DllGetClassObjectFunc)(REFCLSID clsid, REFIID iid, LPVOID *ppv);
#else
    typedef HRESULT (CALLBACK *DllGetClassObjectFunc)(REFCLSID clsid, REFIID iid, LPVOID *ppv);
#endif
    DllGetClassObjectFunc DllGetClassObject;

    WINE_StringFromCLSID((LPCLSID)rclsid,xclsid);

    TRACE("\n\tCLSID:\t%s,\n\tIID:\t%s\n", debugstr_guid(rclsid), debugstr_guid(iid));

    if (pServerInfo) {
        FIXME("\tpServerInfo: name=%s\n",debugstr_w(pServerInfo->pwszName));
        FIXME("\t\tpAuthInfo=%p\n",pServerInfo->pAuthInfo);
    }

    /*
     * First, try and see if we can't match the class ID with one of the
     * registered classes.
     */
    if (S_OK == COM_GetRegisteredClassObject(rclsid, dwClsContext, &regClassObject))
    {
      /*
       * Get the required interface from the retrieved pointer.
       */
      hres = IUnknown_QueryInterface(regClassObject, iid, ppv);

      /*
       * Since QI got another reference on the pointer, we want to release the
       * one we already have. If QI was unsuccessful, this will release the object. This
       * is good since we are not returning it in the "out" parameter.
       */
      IUnknown_Release(regClassObject);

      return hres;
    }

    /* first try: in-process */
    if ((CLSCTX_INPROC_SERVER | CLSCTX_INPROC_HANDLER) & dwClsContext) {
        char keyname[MAX_PATH];
        char dllpath[MAX_PATH+1];

        sprintf(keyname,"CLSID\\%s\\InprocServer32",xclsid);

        if ( compobj_RegReadPath(keyname, NULL, dllpath, sizeof(dllpath)) != ERROR_SUCCESS) {
            /* failure: CLSID is not found in registry */
            WARN("class %s not registred\n", xclsid);
            hres = REGDB_E_CLASSNOTREG;
        } else {
          if ((hLibrary = LoadLibraryExA(dllpath, 0, LOAD_WITH_ALTERED_SEARCH_PATH)) == 0) {
            /* failure: DLL could not be loaded */
            ERR("couldn't load InprocServer32 dll %s\n", dllpath);
            hres = E_ACCESSDENIED; /* FIXME: or should this be CO_E_DLLNOTFOUND? */
          } else if (!(DllGetClassObject = (DllGetClassObjectFunc)GetProcAddress(hLibrary, "DllGetClassObject"))) {
            /* failure: the dll did not export DllGetClassObject */
            ERR("couldn't find function DllGetClassObject in %s\n", dllpath);
            FreeLibrary( hLibrary );
            hres = CO_E_DLLNOTFOUND;
          } else {
            /* OK: get the ClassObject */
            COMPOBJ_DLLList_Add( hLibrary );
            return DllGetClassObject(rclsid, iid, ppv);
          }
        }
    }

    /* Next try out of process */
    if (CLSCTX_LOCAL_SERVER & dwClsContext)
    {
        return create_marshalled_proxy(rclsid,iid,ppv);
    }

    /* Finally try remote */
    if (CLSCTX_REMOTE_SERVER & dwClsContext)
    {
        FIXME ("CLSCTX_REMOTE_SERVER not supported\n");
        hres = E_NOINTERFACE;
    }

    return hres;
}
/***********************************************************************
 *        CoResumeClassObjects (OLE32.173)
 *
 * Resumes classobjects registered with REGCLS suspended
 */
HRESULT WINAPI CoResumeClassObjects(void)
{
        FIXME("\n");
        return S_OK;
}

/***********************************************************************
 *        GetClassFile (OLE32.67)
 *
 * This function supplies the CLSID associated with the given filename.
 */
HRESULT WINAPI GetClassFile(LPCOLESTR filePathName,CLSID *pclsid)
{
    IStorage *pstg=0;
    HRESULT res;
    int nbElm, length, i;
    LONG sizeProgId;
    LPOLESTR *pathDec=0,absFile=0,progId=0;
    LPWSTR extension;
    static const WCHAR bkslashW[] = {'\\',0};
    static const WCHAR dotW[] = {'.',0};

    TRACE("%s, %p\n", debugstr_w(filePathName), pclsid);

    /* if the file contain a storage object the return the CLSID writen by IStorage_SetClass method*/
    if((StgIsStorageFile(filePathName))==S_OK){

        res=StgOpenStorage(filePathName,NULL,STGM_READ | STGM_SHARE_DENY_WRITE,NULL,0,&pstg);

        if (SUCCEEDED(res))
            res=ReadClassStg(pstg,pclsid);

        IStorage_Release(pstg);

        return res;
    }
    /* if the file is not a storage object then attemps to match various bits in the file against a
       pattern in the registry. this case is not frequently used ! so I present only the psodocode for
       this case

     for(i=0;i<nFileTypes;i++)

        for(i=0;j<nPatternsForType;j++){

            PATTERN pat;
            HANDLE  hFile;

            pat=ReadPatternFromRegistry(i,j);
            hFile=CreateFileW(filePathName,,,,,,hFile);
            SetFilePosition(hFile,pat.offset);
            ReadFile(hFile,buf,pat.size,NULL,NULL);
            if (memcmp(buf&pat.mask,pat.pattern.pat.size)==0){

                *pclsid=ReadCLSIDFromRegistry(i);
                return S_OK;
            }
        }
     */

    /* if the obove strategies fail then search for the extension key in the registry */

    /* get the last element (absolute file) in the path name */
    nbElm=FileMonikerImpl_DecomposePath(filePathName,&pathDec);
    absFile=pathDec[nbElm-1];

    /* failed if the path represente a directory and not an absolute file name*/
    if (!lstrcmpW(absFile, bkslashW))
        return MK_E_INVALIDEXTENSION;

    /* get the extension of the file */
    extension = NULL;
    length=lstrlenW(absFile);
    for(i = length-1; (i >= 0) && *(extension = &absFile[i]) != '.'; i--)
        /* nothing */;

    if (!extension || !lstrcmpW(extension, dotW))
        return MK_E_INVALIDEXTENSION;

    res=RegQueryValueW(HKEY_CLASSES_ROOT, extension, NULL, &sizeProgId);

    /* get the progId associated to the extension */
    progId = CoTaskMemAlloc(sizeProgId);
    res = RegQueryValueW(HKEY_CLASSES_ROOT, extension, progId, &sizeProgId);

    if (res==ERROR_SUCCESS)
        /* return the clsid associated to the progId */
        res= CLSIDFromProgID(progId,pclsid);

    for(i=0; pathDec[i]!=NULL;i++)
        CoTaskMemFree(pathDec[i]);
    CoTaskMemFree(pathDec);

    CoTaskMemFree(progId);

    if (res==ERROR_SUCCESS)
        return res;

    return MK_E_INVALIDEXTENSION;
}
/***********************************************************************
 *           CoCreateInstance [COMPOBJ.13]
 *           CoCreateInstance [OLE32.7]
 */
HRESULT WINAPI CoCreateInstance(
        REFCLSID rclsid,
        LPUNKNOWN pUnkOuter,
        DWORD dwClsContext,
        REFIID iid,
        LPVOID *ppv)
{
        HRESULT hres;
        LPCLASSFACTORY lpclf = 0;

  /*
   * Sanity check
   */
  if (ppv==0)
    return E_POINTER;

  /*
   * Initialize the "out" parameter
   */
  *ppv = 0;

  /*
   * Get a class factory to construct the object we want.
   */
  hres = CoGetClassObject(rclsid,
                          dwClsContext,
                          NULL,
                          &IID_IClassFactory,
                          (LPVOID)&lpclf);

  if (FAILED(hres)) {
    FIXME("no classfactory created for CLSID %s, hres is 0x%08lx\n",
          debugstr_guid(rclsid),hres);
    return hres;
  }

  /*
   * Create the object and don't forget to release the factory
   */
        hres = IClassFactory_CreateInstance(lpclf, pUnkOuter, iid, ppv);
        IClassFactory_Release(lpclf);
        if(FAILED(hres))
          FIXME("no instance created for interface %s of class %s, hres is 0x%08lx\n",
                debugstr_guid(iid), debugstr_guid(rclsid),hres);

        return hres;
}

/***********************************************************************
 *           CoCreateInstanceEx [OLE32.165]
 */
HRESULT WINAPI CoCreateInstanceEx(
  REFCLSID      rclsid,
  LPUNKNOWN     pUnkOuter,
  DWORD         dwClsContext,
  COSERVERINFO* pServerInfo,
  ULONG         cmq,
  MULTI_QI*     pResults)
{
  IUnknown* pUnk = NULL;
  HRESULT   hr;
  ULONG     index;
  int       successCount = 0;

  /*
   * Sanity check
   */
  if ( (cmq==0) || (pResults==NULL))
    return E_INVALIDARG;

  if (pServerInfo!=NULL)
    FIXME("() non-NULL pServerInfo not supported!\n");

  /*
   * Initialize all the "out" parameters.
   */
  for (index = 0; index < cmq; index++)
  {
    pResults[index].pItf = NULL;
    pResults[index].hr   = E_NOINTERFACE;
  }

  /*
   * Get the object and get its IUnknown pointer.
   */
  hr = CoCreateInstance(rclsid,
                        pUnkOuter,
                        dwClsContext,
                        &IID_IUnknown,
                        (VOID**)&pUnk);

  if (hr)
    return hr;

  /*
   * Then, query for all the interfaces requested.
   */
  for (index = 0; index < cmq; index++)
  {
    pResults[index].hr = IUnknown_QueryInterface(pUnk,
                                                 pResults[index].pIID,
                                                 (VOID**)&(pResults[index].pItf));

    if (pResults[index].hr == S_OK)
      successCount++;
  }

  /*
   * Release our temporary unknown pointer.
   */
  IUnknown_Release(pUnk);

  if (successCount == 0)
    return E_NOINTERFACE;

  if (successCount!=cmq)
    return CO_S_NOTALLINTERFACES;

  return S_OK;
}

/***********************************************************************
 *           CoLoadLibrary (OLE32.30)
 */
HINSTANCE WINAPI CoLoadLibrary(LPOLESTR lpszLibName, BOOL bAutoFree)
{
    TRACE("(%s, %d)\n", debugstr_w(lpszLibName), bAutoFree);

    return LoadLibraryExW(lpszLibName, 0, LOAD_WITH_ALTERED_SEARCH_PATH);
}

/***********************************************************************
 *           CoFreeLibrary [OLE32.13]
 *
 * NOTES: don't belive the docu
 */
void WINAPI CoFreeLibrary(HINSTANCE hLibrary)
{
        FreeLibrary(hLibrary);
}


/***********************************************************************
 *           CoFreeAllLibraries [OLE32.12]
 *
 * NOTES: don't belive the docu
 */
void WINAPI CoFreeAllLibraries(void)
{
        /* NOP */
}


/***********************************************************************
 *           CoFreeUnusedLibraries [COMPOBJ.17]
 *           CoFreeUnusedLibraries [OLE32.14]
 *
 * FIXME: Calls to CoFreeUnusedLibraries from any thread always route
 * through the main apartment's thread to call DllCanUnloadNow
 */
void WINAPI CoFreeUnusedLibraries(void)
{
    COMPOBJ_DllList_FreeUnused(0);
}

/***********************************************************************
 *           CoFileTimeNow [COMPOBJ.82]
 *           CoFileTimeNow [OLE32.10]
 *
 * RETURNS
 *      the current system time in lpFileTime
 */
HRESULT WINAPI CoFileTimeNow( FILETIME *lpFileTime ) /* [out] the current time */
{
    GetSystemTimeAsFileTime( lpFileTime );
    return S_OK;
}

/***********************************************************************
 *           CoLoadLibrary (OLE32.30)
 */
static void COM_RevokeAllClasses()
{
  EnterCriticalSection( &csRegisteredClassList );

  while (firstRegisteredClass!=0)
  {
    CoRevokeClassObject(firstRegisteredClass->dwCookie);
  }

  LeaveCriticalSection( &csRegisteredClassList );
}

/****************************************************************************
 *  COM External Lock methods implementation
 *
 *  This api provides a linked list to managed external references to
 *  COM objects.
 *
 *  The public interface consists of three calls:
 *      COM_ExternalLockAddRef
 *      COM_ExternalLockRelease
 *      COM_ExternalLockFreeList
 */

#define EL_END_OF_LIST 0
#define EL_NOT_FOUND   0

/*
 * Declaration of the static structure that manage the
 * external lock to COM  objects.
 */
typedef struct COM_ExternalLock     COM_ExternalLock;
typedef struct COM_ExternalLockList COM_ExternalLockList;

struct COM_ExternalLock
{
  IUnknown         *pUnk;     /* IUnknown referenced */
  ULONG            uRefCount; /* external lock counter to IUnknown object*/
  COM_ExternalLock *next;     /* Pointer to next element in list */
};

struct COM_ExternalLockList
{
  COM_ExternalLock *head;     /* head of list */
};

/*
 * Declaration and initialization of the static structure that manages
 * the external lock to COM objects.
 */
static COM_ExternalLockList elList = { EL_END_OF_LIST };

/*
 * Private methods used to managed the linked list
 */


static COM_ExternalLock* COM_ExternalLockLocate(
  COM_ExternalLock *element,
  IUnknown         *pUnk);

/****************************************************************************
 * Internal - Insert a new IUnknown* to the linked list
 */
static BOOL COM_ExternalLockInsert(
  IUnknown *pUnk)
{
  COM_ExternalLock *newLock      = NULL;
  COM_ExternalLock *previousHead = NULL;

  /*
   * Allocate space for the new storage object
   */
  newLock = HeapAlloc(GetProcessHeap(), 0, sizeof(COM_ExternalLock));

  if (newLock!=NULL) {
    if ( elList.head == EL_END_OF_LIST ) {
      elList.head = newLock;    /* The list is empty */
    } else {
      /* insert does it at the head */
      previousHead  = elList.head;
      elList.head = newLock;
    }

    /* Set new list item data member */
    newLock->pUnk      = pUnk;
    newLock->uRefCount = 1;
    newLock->next      = previousHead;

    return TRUE;
  }
  return FALSE;
}

/****************************************************************************
 * Internal - Method that removes an item from the linked list.
 */
static void COM_ExternalLockDelete(
  COM_ExternalLock *itemList)
{
  COM_ExternalLock *current = elList.head;

  if ( current == itemList ) {
    /* this section handles the deletion of the first node */
    elList.head = itemList->next;
    HeapFree( GetProcessHeap(), 0, itemList);
  } else {
    do {
      if ( current->next == itemList ){   /* We found the item to free  */
        current->next = itemList->next;  /* readjust the list pointers */
        HeapFree( GetProcessHeap(), 0, itemList);
        break;
      }

      /* Skip to the next item */
      current = current->next;

    } while ( current != EL_END_OF_LIST );
  }
}

/****************************************************************************
 * Internal - Recursivity agent for IUnknownExternalLockList_Find
 *
 * NOTES: how long can the list be ?? (recursive!!!)
 */
static COM_ExternalLock* COM_ExternalLockLocate( COM_ExternalLock *element, IUnknown *pUnk)
{
  if ( element == EL_END_OF_LIST )
    return EL_NOT_FOUND;
  else if ( element->pUnk == pUnk )    /* We found it */
    return element;
  else                                 /* Not the right guy, keep on looking */
    return COM_ExternalLockLocate( element->next, pUnk);
}

/****************************************************************************
 * Public - Method that increments the count for a IUnknown* in the linked
 * list.  The item is inserted if not already in the list.
 */
static void COM_ExternalLockAddRef(IUnknown *pUnk)
{
  COM_ExternalLock *externalLock = COM_ExternalLockLocate(elList.head, pUnk);

  /*
   * Add an external lock to the object. If it was already externally
   * locked, just increase the reference count. If it was not.
   * add the item to the list.
   */
  if ( externalLock == EL_NOT_FOUND )
    COM_ExternalLockInsert(pUnk);
  else
    externalLock->uRefCount++;

  /*
   * Add an internal lock to the object
   */
  IUnknown_AddRef(pUnk);
}

/****************************************************************************
 * Public - Method that decrements the count for a IUnknown* in the linked
 * list.  The item is removed from the list if its count end up at zero or if
 * bRelAll is TRUE.
 */
static void COM_ExternalLockRelease(
  IUnknown *pUnk,
  BOOL   bRelAll)
{
  COM_ExternalLock *externalLock = COM_ExternalLockLocate(elList.head, pUnk);

  if ( externalLock != EL_NOT_FOUND ) {
    do {
      externalLock->uRefCount--;  /* release external locks      */
      IUnknown_Release(pUnk);     /* release local locks as well */

      if ( bRelAll == FALSE ) break;  /* perform single release */

    } while ( externalLock->uRefCount > 0 );

    if ( externalLock->uRefCount == 0 )  /* get rid of the list entry */
      COM_ExternalLockDelete(externalLock);
  }
}
/****************************************************************************
 * Public - Method that frees the content of the list.
 */
static void COM_ExternalLockFreeList()
{
  COM_ExternalLock *head;

  head = elList.head;                 /* grab it by the head             */
  while ( head != EL_END_OF_LIST ) {
    COM_ExternalLockDelete(head);     /* get rid of the head stuff       */
    head = elList.head;               /* get the new head...             */
  }
}

/****************************************************************************
 * Public - Method that dump the content of the list.
 */
void COM_ExternalLockDump()
{
  COM_ExternalLock *current = elList.head;

  DPRINTF("\nExternal lock list contains:\n");

  while ( current != EL_END_OF_LIST ) {
    DPRINTF( "\t%p with %lu references count.\n", current->pUnk, current->uRefCount);

    /* Skip to the next item */
    current = current->next;
  }
}

/******************************************************************************
 *              CoLockObjectExternal    [OLE32.31]
 */
HRESULT WINAPI CoLockObjectExternal(
    LPUNKNOWN pUnk,             /* [in] object to be locked */
    BOOL fLock,         /* [in] do lock */
    BOOL fLastUnlockReleases) /* [in] unlock all */
{

        if (fLock) {
            /*
             * Increment the external lock coutner, COM_ExternalLockAddRef also
             * increment the object's internal lock counter.
             */
            COM_ExternalLockAddRef( pUnk);
        } else {
            /*
             * Decrement the external lock coutner, COM_ExternalLockRelease also
             * decrement the object's internal lock counter.
             */
            COM_ExternalLockRelease( pUnk, fLastUnlockReleases);
        }

        return S_OK;
}

/***********************************************************************
 *           CoInitializeWOW (OLE32.27)
 */
HRESULT WINAPI CoInitializeWOW(DWORD x,DWORD y) {
    FIXME("(0x%08lx,0x%08lx),stub!\n",x,y);
    return 0;
}

static IUnknown * pUnkState = 0; /* FIXME: thread local */
static int nStatCounter = 0;     /* global */
static HMODULE hOleAut32 = 0;    /* global */

/***********************************************************************
 *           CoGetState [OLE32.24]
 *
 * NOTES: might be incomplete
 */
HRESULT WINAPI CoGetState(IUnknown ** ppv)
{
        FIXME("\n");

        if(pUnkState) {
            IUnknown_AddRef(pUnkState);
            *ppv = pUnkState;
            FIXME("-- %p\n", *ppv);
            return S_OK;
        }
        *ppv = NULL;
        return E_FAIL;

}

/***********************************************************************
 *           CoSetState [OLE32.42]
 *
 * NOTES: FIXME: protect this with a crst
 */
HRESULT WINAPI CoSetState(IUnknown * pv)
{
        FIXME("(%p),stub!\n", pv);

        if (pv) {
            IUnknown_AddRef(pv);
            nStatCounter++;
            if (nStatCounter == 1) LoadLibraryA("OLEAUT32.DLL");
        }

        if (pUnkState) {
            TRACE("-- release %p now\n", pUnkState);
            IUnknown_Release(pUnkState);
            nStatCounter--;
            if (!nStatCounter) FreeLibrary(hOleAut32);
        }
        pUnkState = pv;
        return S_OK;
}


/******************************************************************************
 *              OleGetAutoConvert        [OLE32.104]
 */
HRESULT WINAPI OleGetAutoConvert(REFCLSID clsidOld, LPCLSID pClsidNew)
{
    HKEY hkey = 0;
    char buf[200];
    WCHAR wbuf[200];
    DWORD len;
    HRESULT res = S_OK;

    sprintf(buf,"CLSID\\");WINE_StringFromCLSID(clsidOld,&buf[6]);
    if (RegOpenKeyA(HKEY_CLASSES_ROOT,buf,&hkey))
    {
        res = REGDB_E_CLASSNOTREG;
        goto done;
    }
    len = 200;
    /* we can just query for the default value of AutoConvertTo key like that,
       without opening the AutoConvertTo key and querying for NULL (default) */
    if (RegQueryValueA(hkey,"AutoConvertTo",buf,&len))
    {
        res = REGDB_E_KEYMISSING;
        goto done;
    }
    MultiByteToWideChar( CP_ACP, 0, buf, -1, wbuf, sizeof(wbuf)/sizeof(WCHAR) );
    CLSIDFromString(wbuf,pClsidNew);
done:
    if (hkey) RegCloseKey(hkey);
    return res;
}

/******************************************************************************
 *              OleSetAutoConvert        [OLE32.126]
 */
HRESULT WINAPI OleSetAutoConvert(REFCLSID clsidOld, REFCLSID clsidNew)
{
    HKEY hkey = 0;
    char buf[200], szClsidNew[200];
    HRESULT res = S_OK;

    TRACE("(%s,%s)\n", debugstr_guid(clsidOld), debugstr_guid(clsidNew));
    sprintf(buf,"CLSID\\");WINE_StringFromCLSID(clsidOld,&buf[6]);
    WINE_StringFromCLSID(clsidNew, szClsidNew);
    if (RegOpenKeyA(HKEY_CLASSES_ROOT,buf,&hkey))
    {
        res = REGDB_E_CLASSNOTREG;
        goto done;
    }
    if (RegSetValueA(hkey, "AutoConvertTo", REG_SZ, szClsidNew, strlen(szClsidNew)+1))
    {
        res = REGDB_E_WRITEREGDB;
        goto done;
    }

done:
    if (hkey) RegCloseKey(hkey);
    return res;
}

/******************************************************************************
 *              CoTreatAsClass        [OLE32.46]
 */
HRESULT WINAPI CoTreatAsClass(REFCLSID clsidOld, REFCLSID clsidNew)
{
    HKEY hkey = 0;
    char buf[200], szClsidNew[200];
    HRESULT res = S_OK;

    FIXME("(%s,%s)\n", debugstr_guid(clsidOld), debugstr_guid(clsidNew));
    sprintf(buf,"CLSID\\");WINE_StringFromCLSID(clsidOld,&buf[6]);
    WINE_StringFromCLSID(clsidNew, szClsidNew);
    if (RegOpenKeyA(HKEY_CLASSES_ROOT,buf,&hkey))
    {
        res = REGDB_E_CLASSNOTREG;
        goto done;
    }
    if (RegSetValueA(hkey, "AutoTreatAs", REG_SZ, szClsidNew, strlen(szClsidNew)+1))
    {
        res = REGDB_E_WRITEREGDB;
        goto done;
    }

done:
    if (hkey) RegCloseKey(hkey);
    return res;
}


/***********************************************************************
 *           IsEqualGUID [OLE32.76]
 *
 * Compares two Unique Identifiers.
 *
 * RETURNS
 *      TRUE if equal
 */
#undef IsEqualGUID
BOOL WINAPI IsEqualGUID(
     REFGUID rguid1, /* [in] unique id 1 */
     REFGUID rguid2  /* [in] unique id 2 */
     )
{
    return !memcmp(rguid1,rguid2,sizeof(GUID));
}

/***********************************************************************
 *           CoInitializeSecurity [OLE32.164]
 */
HRESULT WINAPI CoInitializeSecurity(PSECURITY_DESCRIPTOR pSecDesc, LONG cAuthSvc,
                                    SOLE_AUTHENTICATION_SERVICE* asAuthSvc,
                                    void* pReserved1, DWORD dwAuthnLevel,
                                    DWORD dwImpLevel, void* pReserved2,
                                    DWORD dwCapabilities, void* pReserved3)
{
  FIXME("(%p,%ld,%p,%p,%ld,%ld,%p,%ld,%p) - stub!\n", pSecDesc, cAuthSvc,
        asAuthSvc, pReserved1, dwAuthnLevel, dwImpLevel, pReserved2,
        dwCapabilities, pReserved3);
  return S_OK;
}