windows-server-2003/com/ole32/olethunk/olethk32/thop16.cxx

//+---------------------------------------------------------------------------
//
//  Microsoft Windows
//  Copyright (C) Microsoft Corporation, 1992 - 1994.
//
//  File:       thop16.cxx
//
//  Contents:   Thop implementations for 16->32
//
//  History:    22-Feb-94       DrewB   Created
//
//----------------------------------------------------------------------------

#include "headers.cxx"
#pragma hdrstop

#include <ole2.h>
#include <valid.h>
#include <string.h>

#include "struct16.hxx"

//+---------------------------------------------------------------------------
//
//  Function:   EXECUTE_THOP1632, public
//
//  Synopsis:   Debugging version of thop dispatch routine
//
//  Arguments:  [pti] - Thunking info
//
//  Returns:    Appropriate status
//
//  History:    24-Feb-94       DrewB   Created
//
//----------------------------------------------------------------------------

#if DBG == 1
DWORD EXECUTE_THOP1632(THUNKINFO *pti)
{
    thkDebugOut((DEB_THOPS, "%sIn ExThop1632: %s (0x%02X), s16 %p, s32 %p\n",
                 NestingLevelString(), 
                 ThopName(*pti->pThop), *pti->pThop, pti->s16.pbCurrent,
                 pti->s32.pbCurrent));
    DebugIncrementNestingLevel();
    
    // Local variable
    DWORD dwRet;

    // Sanity check
    thkAssert((*pti->pThop & THOP_OPMASK) < THOP_LASTOP);
    dwRet = (*aThopFunctions1632[*((pti)->pThop) & THOP_OPMASK])(pti);

    DebugDecrementNestingLevel();
    thkDebugOut((DEB_THOPS, "%sOut ExThop1632\n", NestingLevelString()));
    return(dwRet);
}
#endif

#if DBG == 1
DWORD EXECUTE_ENUMTHOP1632(THUNKINFO *pti)
{
    thkDebugOut((DEB_THOPS, "%sIn ExEnumThop1632: %s (0x%02X), s16 %p, s32 %p\n",
                 NestingLevelString(), 
                 EnumThopName(*pti->pThop), *pti->pThop, pti->s16.pbCurrent,
                 pti->s32.pbCurrent));
    DebugIncrementNestingLevel();

    // Local variable
    DWORD dwRet;
    
    dwRet = (*aThopEnumFunctions1632[*(pti)->pThop])(pti);
    
    DebugDecrementNestingLevel();
    thkDebugOut((DEB_THOPS, "%sOut ExEnumThop1632\n", NestingLevelString()));
    return(dwRet);
}
#endif

// Generated by the tool, in tc1632.cxx
DWORD ThunkCall1632( THUNKINFO * );

//+---------------------------------------------------------------------------
//
//  Function:   FixedThopHandler, public
//
//  Synopsis:   Generic function which handles the high-level details
//              of thop execution for thops that operate on known-size
//              data
//
//  Arguments:  [pti] - Thunking state information
//              [thop] - Thop being executed
//              [cb16] - 16-bit size
//              [pfn1632] - 16->32 conversion routine
//              [cb32] - 32-bit size
//              [pfn3216] - 32->16 conversion routine
//
//  Returns:    Appropriate status code
//
//  History:    05-Apr-94       DrewB   Created
//
//  Notes:      Automatically increments pThop
//
//----------------------------------------------------------------------------

DWORD FixedThopHandler1632(THUNKINFO *pti,
                           THOP thop,
                           UINT cb16,
                           FIXEDHANDLERROUTINE pfn1632,
                           UINT cb32,
                           FIXEDHANDLERROUTINE pfn3216)
{
    DWORD   dwResult;
    VPVOID  vp16;
    BYTE    *pb16;
    BYTE    *pb32;

    if ((thop & (THOP_IN | THOP_OUT)) != 0)
    {
        pb32 = NULL;

        GET_STACK16(pti, vp16, VPVOID);
        if ( vp16 != 0 )
        {
            pb16 = (BYTE *)ValidatePtr16(pti, vp16, cb16, thop);
            if (pb16 != NULL)
            {
                pb32 = (BYTE *)STACKALLOC32(cb32);
                if (pb32 == NULL)
                {
                    pti->scResult = E_OUTOFMEMORY;
                }
                else if ((thop & THOP_IN) != 0)
                {
                    (pfn1632)(pb16, pb32, cb16, cb32);
                }

                WOWRELVDMPTR(vp16);
            }
        }

        TO_STACK32(pti, pb32, BYTE *);

        pti->pThop++;
        dwResult = EXECUTE_THOP1632(pti);

        if ((thop & THOP_OUT) != 0 && vp16 != 0)
        {
            pb16 = (BYTE *)WOWFIXVDMPTR(vp16, cb16);

            if (SUCCEEDED(dwResult))
            {
                (pfn3216)(pb32, pb16, cb32, cb16);
            }
            else if ((thop & THOP_IN) == 0)
            {
                // Zero out-only parameters on failure
                memset(pb16, 0, cb16);
            }

            WOWRELVDMPTR(vp16);
        }

        if (pb32 != NULL)
        {
            STACKFREE32(pb32, cb32);
        }
    }
    else
    {
        (pfn1632)(PTR_STACK16(&pti->s16, cb16), PTR_STACK32(&pti->s32),
                  cb16, cb32);
        SKIP_STACK16(&pti->s16, cb16);
        SKIP_STACK32(&pti->s32, cb32);

        pti->pThop++;
        dwResult = EXECUTE_THOP1632(pti);
    }

    return dwResult;
}

//-----------------------------------------------------------------------------
//
// Handler-based thunks
//
// These thunks use the fixed-size generic thop handler to do their work
//
//-----------------------------------------------------------------------------

// Handle straight copy
DWORD Thop_Copy_1632(THUNKINFO *pti)
{
    THOP thopSize;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_COPY);

    thopSize = *++pti->pThop;
    return FixedThopHandler1632(pti,
                                *(pti->pThop-1),
                                thopSize, FhCopyMemory,
                                thopSize, FhCopyMemory);
}

DWORD Thop_ShortToLong_1632(THUNKINFO *pti)
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_SHORTLONG);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(SHORT), FhShortToLong,
                                sizeof(LONG), FhLongToShort);
}

DWORD Thop_WordToDword_1632(THUNKINFO *pti)
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_WORDDWORD);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(WORD), FhWordToDword,
                                sizeof(DWORD), FhDwordToWord);
}

DWORD Thop_GdiHandle_1632(THUNKINFO *pti)
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_HGDI);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(HAND16), FhGdiHandle1632,
                                sizeof(HANDLE), FhGdiHandle3216);
}

DWORD Thop_UserHandle_1632(THUNKINFO *pti)
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_HUSER);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(HAND16), FhUserHandle1632,
                                sizeof(HANDLE), FhUserHandle3216);
}

DWORD Thop_HACCEL_1632(THUNKINFO *pti)
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_HACCEL);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(HAND16), FhHaccel1632,
                                sizeof(HANDLE), FhHaccel3216);
}

DWORD Thop_HTASK_1632(THUNKINFO *pti)
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_HTASK);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(HAND16), FhHtask1632,
                                sizeof(HANDLE), FhHtask3216);
}

DWORD Thop_HRESULT_1632( THUNKINFO *pti )
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_HRESULT);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(HRESULT), FhHresult1632,
                                sizeof(HRESULT), FhHresult3216);
}

DWORD Thop_NULL_1632(THUNKINFO *pti)
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_NULL);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(void *), FhNull,
                                sizeof(void *), FhNull);
}

DWORD Thop_RECT_1632( THUNKINFO *pti )
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_RECT);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(RECT16), FhRect1632,
                                sizeof(RECT), FhRect3216);
}

DWORD Thop_BINDOPTS_1632( THUNKINFO *pti )
{
    VPVOID vpbo16;
    BIND_OPTS UNALIGNED *pbo;
    UINT cb;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_BINDOPTS);

    PEEK_STACK16(pti, vpbo16, VPVOID);
    pbo = (BIND_OPTS UNALIGNED *)GetReadPtr16(pti, vpbo16, sizeof(BIND_OPTS));
    if (pbo != NULL)
    {
        cb = pbo->cbStruct;
        WOWRELVDMPTR(vpbo16);
    }
    else
    {
        // Doesn't really matter, since pti->scResult was set to error
        // by GetReadPtr16
        cb = sizeof(BIND_OPTS);
    }

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                cb, FhCopyMemory,
                                cb, FhCopyMemory);
}

DWORD Thop_SIZE_1632( THUNKINFO *pti )
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_SIZE);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(SIZE16), FhSize1632,
                                sizeof(SIZE), FhSize3216);
}

DWORD Thop_MSG_1632( THUNKINFO *pti )
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_MSG);

    return FixedThopHandler1632(pti,
                                *pti->pThop,
                                sizeof(MSG16), FhMsg1632,
                                sizeof(MSG), FhMsg3216);
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_ERROR_1632, public
//
//  Synopsis:   Any Thop type which should just fail with an error
//              should go be directed here.
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    23-Feb-94       BobDay  Created
//
//----------------------------------------------------------------------------
DWORD Thop_ERROR_1632 ( THUNKINFO *pti )
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_ERROR);

    thkAssert( FALSE && "Hey we hit an ERROR Thop in 16->32" );

    return (DWORD)E_UNEXPECTED;
}

//+---------------------------------------------------------------------------
//
//  Function:   ThunkInString1632, public
//
//  Synopsis:   Converts an in-parameter string
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    24-Aug-94       DrewB   Created
//
//----------------------------------------------------------------------------

DWORD ThunkInString1632(THUNKINFO *pti)
{
    DWORD   dwResult;
    VPSTR   vpstr;
    LPOLESTR lpstrDest;
    OLECHAR *ptcStackText;

    dwResult = (DWORD)S_OK;
    ptcStackText = NULL;

    GET_STACK16(pti, vpstr, VPSTR);

    if (vpstr == 0)
    {
        lpstrDest = NULL;
    }
    else
    {
        ptcStackText = (OLECHAR *)STACKALLOC32(CWCSTRINGPREALLOC*
                                               sizeof(OLECHAR));
        if (ptcStackText == NULL)
        {
            pti->scResult = E_OUTOFMEMORY;
        }
        else
        {
            lpstrDest = Convert_VPSTR_to_LPOLESTR( pti, vpstr, ptcStackText,
                                                   CWCSTRINGPREALLOC );
        }
    }

    thkDebugOut((DEB_ARGS, "In1632  LPSTR: %p -> %p '%ws'\n",
                 vpstr, lpstrDest, lpstrDest));

    TO_STACK32(pti, lpstrDest, LPOLESTR );

    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    if (lpstrDest != NULL)
    {
        Convert_VPSTR_to_LPOLESTR_free( ptcStackText, lpstrDest );
    }

    if (ptcStackText != NULL)
    {
        STACKFREE32(ptcStackText, CWCSTRINGPREALLOC*sizeof(OLECHAR));
    }

    return( dwResult );
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_LPSTR_1632, public
//
//  Synopsis:   Converts 16-bit LPSTR to 32-bit LPSTR pointer
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    23-Feb-94       BobDay  Created
//
//----------------------------------------------------------------------------

DWORD Thop_LPSTR_1632( THUNKINFO *pti )
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_LPSTR);
    //
    // We have only input LPSTRs
    //
    thkAssert( (*pti->pThop & THOP_IOMASK) == THOP_IN &&
               "LPSTR must be input only!" );

    return ThunkInString1632(pti);
}

//+---------------------------------------------------------------------------
//
//  Function:   ConvertTaskString3216, public
//
//  Synopsis:   Converts a task-memory string
//
//  Arguments:  [pti] - Thunk info
//              [pos32] - String
//              [vpstrPreAlloc] - Preallocated string or NULL
//              [cchPreAlloc] - Preallocated size or zero
//              [pvpstr16] - String
//
//  Returns:    Appropriate status code
//
//  Modifies:   [pti]
//              [pvpstr16]
//
//  History:    14-May-94       DrewB   Created
//
//  Notes:      Frees preallocation if successful and:
//                  Name is too large or
//                  Name is NULL
//
//              Always frees source string if non-zero and valid
//
//----------------------------------------------------------------------------

SCODE ConvertTaskString3216(THUNKINFO *pti,
                            LPOLESTR pos32,
                            VPSTR vpstrPreAlloc,
                            UINT cchPreAlloc,
                            VPSTR UNALIGNED *pvpstr16)
{
    VPVOID vpstr16;
    UINT cch;
    SCODE sc;

    sc = S_OK;

    if (pos32 == NULL)
    {
        vpstr16 = 0;
    }
    else
    {
        if (IsBadStringPtrW(pos32, CCHMAXSTRING))
        {
            sc = E_INVALIDARG;
        }
        else
        {
            cch = lstrlenW(pos32)+1;

            if (cch > cchPreAlloc)
            {
                // Our prealloc buffer is too small, so try and get a
                // new one

                // Allow for each Unicode character to take two
                // bytes in case of multibyte expansion
                vpstr16 = (VPSTR)TaskMalloc16( cch*2 );
                if (vpstr16 == 0)
                {
                    sc = E_OUTOFMEMORY;
                }
            }
            else
            {
                vpstr16 = vpstrPreAlloc;
            }

            if (SUCCEEDED(sc))
            {
                sc = Convert_LPOLESTR_to_VPSTR(pos32, vpstr16, cch, cch*2);
                if (FAILED(sc) && vpstr16 != vpstrPreAlloc)
                {
                    TaskFree16(vpstr16);
                }
            }

            TaskFree32(pos32);
        }
    }

    if (SUCCEEDED(sc))
    {
        // If there was a preallocated string we didn't use,
        // free it
        if (vpstrPreAlloc != 0 && vpstrPreAlloc != vpstr16)
        {
            TaskFree16(vpstrPreAlloc);
        }

        *pvpstr16 = vpstr16;
    }

    return sc;
}

//+---------------------------------------------------------------------------
//
//  Function:   ThunkOutString1632, public
//
//  Synopsis:   Converts an out param string or filename
//
//  Arguments:  [pti] - Thunk state information
//              [fFile] - Filename or plain string
//
//  Returns:    Appropriate status code
//
//  History:    24-Aug-94       DrewB   Created
//
//----------------------------------------------------------------------------

DWORD ThunkOutString1632(THUNKINFO *pti,
                         BOOL fFile)
{
    DWORD           dwResult;
    VPVOID          vpvpstr16;
    VPSTR           vpstr16;
    VPSTR UNALIGNED *lpvpstr16;
    LPOLESTR        *lplpstr32;
    LPOLESTR        lpstr = NULL;

    GET_STACK16(pti, vpvpstr16, VPSTR);

    lplpstr32 = NULL;
    if ( vpvpstr16 != 0 )
    {
        lpvpstr16 = (VPSTR UNALIGNED *)GetWritePtr16(pti, vpvpstr16,
                                                     sizeof(VPSTR));
        if ( lpvpstr16 != NULL )
        {
            WOWRELVDMPTR(vpvpstr16);

            lplpstr32 = &lpstr;

            vpstr16 = (VPSTR)TaskMalloc16(CBSTRINGPREALLOC);
            if (vpstr16 == 0)
            {
                pti->scResult = E_OUTOFMEMORY;
            }
        }
    }

    TO_STACK32(pti, lplpstr32, LPOLESTR FAR *);

    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    if ( lplpstr32 != NULL )
    {
        if ( SUCCEEDED(dwResult) )
        {
            SCODE sc;

            if (fFile)
            {
                UINT cch;

                // The string pointed to by lpstr is ours so we
                // can do the long->short conversion in place
                // without worrying about trashing the memory
                // The short path name should always be able
                // to fit in the long path name's buffer since
                // the file names that we are thunking are always
                // absolute paths

                cch = lstrlenW(lpstr)+1;

                // Ignore failures; if we can't convert the name
                // then we simply pass on what we were given
                GetShortPathName(lpstr, lpstr, cch);
            }

            sc = ConvertTaskString3216(pti, lpstr, vpstr16,
                                       CWCSTRINGPREALLOC, &vpstr16);
            if (FAILED(sc))
            {
                dwResult = sc;
            }
        }

        if (FAILED(dwResult))
        {
            TaskFree16(vpstr16);
            vpstr16 = 0;
        }

        lpvpstr16 = FIXVDMPTR( vpvpstr16, VPSTR );
        *lpvpstr16 = vpstr16;

#if DBG==1
        thkDebugOut((DEB_ARGS, "%sOut1632 LPLPSTR: %p -> %p '%s'\n",
                     NestingLevelString(), lpstr, vpstr16,
                     vpstr16 != 0 ? WOWFIXVDMPTR(vpstr16, 0) : "<null>"));
        if (vpstr16 != 0)
        {
            WOWRELVDMPTR(vpstr16);
        }
#endif

        RELVDMPTR( vpvpstr16 );
    }
    else
    {
        thkDebugOut((DEB_ARGS, "Out1632 LPLPSTR NULL\n"));
    }

    return( dwResult );
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_LPLPSTR_1632, public
//
//  Synopsis:   Converts 32-bit LPSTR to 16-bit LPSTR pointer
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    25-Feb-94       BobDay  Created
//
//----------------------------------------------------------------------------
DWORD Thop_LPLPSTR_1632( THUNKINFO *pti )
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_LPLPSTR);
    //
    // We don't have anything but unmodified LPLPSTRs
    //
    thkAssert( (*pti->pThop & THOP_IOMASK) == 0 &&
               "LPLPSTR must be unmodified only!" );

    return ThunkOutString1632(pti, FALSE);
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_BUFFER_1632, public
//
//  Synopsis:   Converts 16-bit block of memory to 32-bit block of memory
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    25-Feb-94       BobDay  Created
//              14-Mar-95       KentCe  Buffer copy not required for Win95.
//
//  Notes:      WARNING! WARNING! WARNING! For an out parameter this expects
//              three parameters on the stack in the following format and order:
//                  VOID *  pointer to buffer
//                  DWORD   count of bytes in buffer
//                  DWORD * count of bytes returned in the buffer
//
//----------------------------------------------------------------------------

#define WATCH_VALUE 0xfef1f0

DWORD Thop_BUFFER_1632( THUNKINFO *pti )
{
    DWORD       dwResult;
    BOOL        fThopInput;
    BOOL        fThopOutput;
    VPVOID      vp16;
    LPVOID      lp16;
    LPVOID      lp32;
    DWORD       dwCount;
    VPVOID      vp16CountOut;
    DWORD       dwCountOut32 = 0;
    DWORD *     pdwCountOut32 = &dwCountOut32;
#if DBG == 1
    DWORD       dwWatch;
#endif

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_BUFFER);

    fThopInput  = IS_THOP_IN(pti);
    fThopOutput = IS_THOP_OUT(pti);

    //
    // We only have in and out BUFFER thops
    //
    thkAssert((fThopInput || fThopOutput)
         && (fThopInput != fThopOutput)
         && "BUFFER must be in or out only!" );

    GET_STACK16(pti, vp16, VPVOID);
    GET_STACK16(pti, dwCount, DWORD);

    if (fThopOutput)
    {
        // Get the pointer to the returned value off the stack
        GET_STACK16(pti, vp16CountOut, VPVOID);
    }

    lp32 = NULL;

    if (vp16 == 0)
    {
        // lp32 is already NULL
    }
    else if (dwCount == 0)
    {
        // If the count is zero then we can pass any valid 32-bit
        // pointer

#if DBG == 1
        // In debug, make sure that no data is written back to the
        // memory we pass on
        dwWatch = WATCH_VALUE;
        lp32 = &dwWatch;
#else
        lp32 = &dwResult;
#endif
    }
    else
    {
        lp16 = ValidatePtr16(pti, vp16, dwCount, *pti->pThop);

        if ( lp16 != NULL )
        {
            lp32 = (LPVOID)CoTaskMemAlloc( dwCount );
            if ( lp32 == NULL )
            {
                pti->scResult = E_OUTOFMEMORY;
            }
            else
            {
                if ( fThopInput )
                {
                    memcpy( lp32, lp16, dwCount );
                }
            }

            WOWRELVDMPTR(vp16);
        }
    }

    thkDebugOut((DEB_ARGS, "1632    BUFFER: %p -> %p, %u\n",
                 vp16, lp32, dwCount));

    TO_STACK32(pti, lp32, LPVOID );
    TO_STACK32(pti, dwCount, DWORD );

    if (fThopOutput)
    {
        TO_STACK32(pti, pdwCountOut32, LPVOID );
    }

    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    if (fThopOutput)
    {
        // If the pointer in sixteen bit land is non-null then return the
        // count of bytes written to the buffer.
        DWORD UNALIGNED *lpdw16 = (DWORD UNALIGNED *)
               ValidatePtr16(pti, vp16CountOut, sizeof(DWORD), *pti->pThop);

        if (lpdw16 != NULL)
        {
            *lpdw16 = dwCountOut32;
            WOWRELVDMPTR(vp16CountOut);
        }

        if ( SUCCEEDED(dwResult) )
        {
            if (dwCountOut32 > 0 && vp16 != 0)
            {
                lp16 = (LPVOID)WOWFIXVDMPTR( vp16, dwCountOut32 );

                memcpy( lp16, lp32, dwCountOut32 );

                WOWRELVDMPTR(vp16);
            }
        }
    }

#if DBG == 1
    if (lp32 != NULL && dwCount == 0)
    {
        thkAssert(dwWatch == WATCH_VALUE);
    }
#endif

    //
    // Now free the buffer
    //
    if ( lp32 != NULL && dwCount > 0 )
    {
        CoTaskMemFree( lp32 );
    }


    return( dwResult );
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_SNB_1632, public
//
//  Synopsis:   Converts 16-bit SNB to 32-bit SNB pointer
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    23-Feb-94       BobDay  Created
//
//----------------------------------------------------------------------------
DWORD Thop_SNB_1632( THUNKINFO *pti )
{
    DWORD       dwResult;
    BOOL        fThopInput;
    BOOL        fThopOutput;
    VPVOID      snb16;
    VPSTR       *lpvpstr;
    VPSTR UNALIGNED *lpvpstrTemp;
    VPSTR       vpstr;
    SNB         snb32;
    UINT        cStr;
    UINT        cStrTemp;
    LPOLESTR    *lplpstr;
    UINT        cbStrings;
    OLECHAR     *pocStr;
    LPSTR       lpstr16;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_SNB);

    fThopInput  = IS_THOP_IN(pti);
    fThopOutput = IS_THOP_OUT(pti);

    //
    // We don't have anything but unmodified SNBs
    //
    thkAssert( !fThopInput && !fThopOutput && "SNB must be unmodified only!" );

    GET_STACK16(pti, snb16, VPVOID);

    snb32 = NULL;
    if ( snb16 != 0 )
    {
        //
        // Count the strings in the 16-bit snb
        //
        lpvpstr = (VPSTR FAR *)GetReadPtr16( pti, snb16, sizeof(VPSTR) );
        if ( lpvpstr != 0 )
        {
            lpvpstrTemp = lpvpstr;
            cStr = 0;
            cbStrings = 0;
            do
            {
                cStr++;
                vpstr = *lpvpstrTemp++;

                if ( vpstr == 0 )
                {
                    break;
                }

                lpstr16 = GetStringPtr16(pti, vpstr, CCHMAXSTRING,
                                         &cStrTemp);
                if ( lpstr16 == 0 )
                {
                    WOWRELVDMPTR(snb16);
                    lpvpstr = NULL;
                    break;      // Leave with snb32 still NULL
                }

                WOWRELVDMPTR(vpstr);

                cbStrings += cStrTemp;
            }
            while ( TRUE );
        }

        if ( lpvpstr != NULL )
        {
            thkDebugOut((DEB_ARGS, "In1632  SNB: %d strings\n", cStr));

            //
            // Allocate space for the 32-bit snb
            //
            snb32 = (LPOLESTR FAR *)CoTaskMemAlloc( cStr*sizeof(LPOLESTR) +
                                                    cbStrings*sizeof(WCHAR));
            if (snb32 == NULL)
            {
                pti->scResult = E_OUTOFMEMORY;
            }
            else
            {
                pocStr = (OLECHAR *)((BYTE *)snb32+cStr*sizeof(LPOLESTR));

                //
                // Now convert the strings
                //
                lpvpstrTemp = lpvpstr;
                lplpstr = snb32;
                cStrTemp = cStr - 1;

                while ( cStrTemp > 0 )
                {
                    --cStrTemp;

                    vpstr = *lpvpstrTemp++;

                    thkAssert( vpstr != 0 &&
                               "Loop is processing end of snb\n" );

                    // Guaranteed to use pocStr as storage since cbStrings is
                    // large enough to contain all the strings
                    *lplpstr = Convert_VPSTR_to_LPOLESTR( pti, vpstr,
                                                          pocStr, cbStrings );

                    if (*lplpstr == NULL)
                    {
                        CoTaskMemFree(snb32);
                        snb32 = NULL;
                        break;
                    }

#if DBG == 1
                    thkDebugOut((DEB_ARGS, "In1632  SNB: %p '%s' -> "
                                 "%p '%ws'\n",
                                 vpstr, WOWFIXVDMPTR(vpstr, 0),
                                 *lplpstr, *lplpstr));
                    WOWRELVDMPTR(vpstr);
#endif

                    pocStr += lstrlenW(pocStr)+1;
                    lplpstr++;
                }

                // Terminate SNB
                *lplpstr = NULL;

                thkAssert(*lpvpstrTemp == 0);

                WOWRELVDMPTR(snb16);
            }
        }
    }

    thkDebugOut((DEB_ARGS, "In1632  SNB: %p -> %p\n", snb16, snb32));

    TO_STACK32(pti, snb32, SNB );

    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    //
    // Free SNB memory if necessary
    //
    if ( snb32 != 0 )
    {
        CoTaskMemFree(snb32);
    }

    return( dwResult );
}

//+---------------------------------------------------------------------------
//
//  Function:   ThunkInterface1632, private
//
//  Synopsis:   Handles interface thunking for THOP_IFACE and
//              THOP_IFACEGEN
//
//  Arguments:  [pti]       - Thunking state information
//              [iidx]      - Interface index or IID
//              [thop]      - Thop being executed
//              [punkOuter] - Controlling IUnknown or NULL
//
//  Returns:    status code
//
//  History:    Mar 14,97   Gopalk      Rewritten to support aggregation and
//                                      proper thunking of IN/OUT interfaces
//
//  Notes:      Assumes caller has already adjusted pti->pThop
//----------------------------------------------------------------------------

DWORD ThunkInterface1632(THUNKINFO *pti, IIDIDX iidx, THOP thop, IUnknown *punkOuter)
{
    // Local variables
    VPVOID vpv;
    DWORD dwResult, dwStatus;
    IUnknown *punkThis32In;
    IUnknown *punkThis32Out;
    VPVOID vpvOut;
    VPVOID vpvIn;
    VPVOID UNALIGNED *pvpvOut;
    VPVOID vpvPreAlloc = NULL;
    THUNK1632OBJ UNALIGNED *pto;
    PROXYHOLDER *pph;
    PROXYHOLDER *pAggHolder = NULL;
    SAggHolder aggHolderNode;
    BOOL      bUnlinkAggHolder = FALSE;
    BOOL      bExtraAddRef;

    // Validate the IID of the interface
    thkAssert(IIDIDX_IS_IID(iidx) ||
              (IIDIDX_INDEX(iidx) >= 0 &&  IIDIDX_INDEX(iidx) <= THI_COUNT));

    // Initialize
    dwResult = (DWORD) S_OK;
    punkThis32In = NULL;
    pph = NULL;

    // Retrieve interface pointer
    GET_STACK16(pti, vpv, VPVOID);

    // Assert invariant
    thkAssert(iidx!=THI_COUNT || vpv==NULL);

    // Check for valid OUT parameter. It also verifies IN-OUT case as well
    if((thop & THOP_OUT) && vpv) {
        pvpvOut = (VPVOID UNALIGNED *)GetWritePtr16(pti, vpv, sizeof(VPVOID));
        if(!pvpvOut) {
            thkDebugOut((DEB_WARN, "WARNING: ThunkInterface1632 - bad pointer %p\n",
                         vpv));
            pti->scResult = E_INVALIDARG;
            return (DWORD) E_INVALIDARG;
        }

        // Check if the interface needs to be thunked IN as well.
        // In other words, IN-OUT paramenter case
        if(thop & THOP_IN)
            vpvIn = *pvpvOut;
        else
            vpvIn = NULL;

        // Release the VMD pointer
        WOWRELVDMPTR(vpv);
    }
    else {
        // It must be IN parameter or a NULL OUT parameter
        vpvIn = vpv;
    }

    // Check if interface needs to be thunked IN
    if(thop & THOP_IN) {
        if (vpvIn) {
            // Validate the interface
            if(IsValidInterface16(pti, vpvIn)) {
                if((thop & THOP_OPMASK) == THOP_IFACENOADDREF) {
                    // vpvIn represents an interface that is used by the
                    // 32-bit side without addrefing it.
                    // Classic example: IOleCacheControl::OnRun
                    // Aggregate it with the identity of the interface on which
                    // the current call is being made to ensure that lifetime of proxy
                    // is controlled by it.
                    VPVOID vpvThis16;

                    // Obtain the 16-bit interface on which the current call is
                    // being made
                    thkAssert(punkOuter);
                    vpvThis16 = pti->pThkMgr->LookupProxy1632(punkOuter);
                    thkAssert(vpvThis16);

                    // Obtain its holder
                    pto = FIXVDMPTR(vpvThis16, THUNK1632OBJ);
                    pph = pto->pphHolder;
                    thkAssert(pto->punkThis32 ==  punkOuter);
                    RELVDMPTR(vpvThis16);

                    // Assert that holder exists
                    thkAssert(pph);
                }
                else {
                    thkAssert(pph == NULL);
                }

                if((thop & THOP_OPMASK) == THOP_UNKOUTER) {                        
                    // Aggregation is being carried out
                    // Assert that interface is only being thunked IN
                    thkAssert(!(thop & THOP_OUT));
                    thkAssert(iidx == THI_IUnknown);

                    // Either find the actual 32-bit identity or generate a
                    // new 32-bit proxy identity for the 16-bit identity
                    punkThis32In = pti->pThkMgr->CreateOuter32(vpvIn, &pAggHolder, &dwStatus);
                    aggHolderNode.pph = pAggHolder;
                    bUnlinkAggHolder = TRUE;
                    TlsThkLinkAggHolder(&aggHolderNode);
                    // We use this pAggHolder for proxies of inner unk(s). Since
                    // we cannot put it in the proxy table (as it is private
                    // and we do not want other thunk calls to use it), we put
                    // it in a linked list in the TLS. The holder gets used by
                    // calls to FindAggregate() when the pUnkInner is being
                    // thunked out. The holder is revoked from the list when
                    // the ThunkInterface call for the pUnkOuter unwinds.
                    
                }
                else {
                    // Find/Generate the proxy for the 16-bit interface to be thunked IN
                    bExtraAddRef = FALSE;
                    if (
                        (
                        (pti->pvfn == (VTBLFN) OleIsCurrentClipboard) &&
                        (TlsThkGetAppCompatFlags() & OACF_WORKSCLIPOBJ) 
                        )
                        || 
                        (
                        (TlsThkGetAppCompatFlags() & OACF_TEXTARTDOBJ) &&
                        (pti->iidx == THI_IDataAdviseHolder) && 
                        (iidx == THI_IDataObject) && (pti->dwMethod == 3)
                        )
                       ){
                        bExtraAddRef = TRUE;
                    }

                    punkThis32In = pti->pThkMgr->FindProxy3216(NULL, vpvIn, pph, 
                                                iidx, bExtraAddRef, &dwStatus);
                }
                
                if(punkThis32In) {
                    thkAssert(!((thop & THOP_OPMASK) == THOP_UNKOUTER) ||
                              (dwStatus == FST_CREATED_NEW) || 
                              (dwStatus == FST_SHORTCUT));
                }
                else {
                    thkDebugOut((DEB_WARN, "WARNING: ThunkInterface1632 - Can't create proxy for %p\n",
                                 vpvIn));                    
					pti->scResult = E_OUTOFMEMORY;
					return (DWORD) E_OUTOFMEMORY;
                }
            }
            else {
                thkDebugOut((DEB_WARN, "WARNING: ThunkInterface1632 - invalid interface %p\n", 
                             vpvIn));
                pti->scResult = E_INVALIDARG;
                return (DWORD) E_INVALIDARG;
            }
        }
        else {
            // No interface to be thunked IN
            punkThis32In = NULL;
        }

        thkDebugOut((DEB_ARGS, "%sIn1632  %s %p -> %p\n", 
                     NestingLevelString(), IidIdxString(iidx),
                     vpvIn, punkThis32In));
    }

    // Check if interface needs to be thunked OUT
    if((thop & THOP_OUT) && vpv) {
        // Preallocate a proxy for the out parameter
        vpvPreAlloc = pti->pThkMgr->CanGetNewProxy1632(iidx);
        if(vpvPreAlloc) {
            // Assert that no interface is being thunked IN for
            // pure OUT parameter case
            thkAssert((thop & THOP_IN) || !punkThis32In);

            // Use a local variable for OUT parameter
            punkThis32Out = punkThis32In;

            // Push the OUT/IN-OUT parameter onto the stack
            TO_STACK32(pti, &punkThis32Out, IUnknown **);
            
            // Corel Draw 5.0 HACK
            // Some apps seem to call through the OUT parameter in the 
            // nested calls before the following call returns

            // Set the temporary proxy's this pointer to point to 
            // 32-bit out pointer pushed onto the satck
            pto = FIXVDMPTR(vpvPreAlloc, THUNK1632OBJ);
            pto->punkThis32 = (IUnknown *)&punkThis32Out;
            RELVDMPTR(vpvPreAlloc);

            // Set the 16-bit OUT parameter to the preallocated proxy
            *FIXVDMPTR(vpv, VPVOID) = vpvPreAlloc;
            RELVDMPTR(vpv);
        }
        else {
			thkDebugOut((DEB_WARN, "WARNING: ThunkInterface1632 - Cannot preallocate proxy\n"));
			pti->scResult = E_OUTOFMEMORY;
			dwResult = (DWORD) E_OUTOFMEMORY;
        }

    }
    else
    {
        // Assert invariant
        thkAssert((vpv && punkThis32In) || (!vpv && !punkThis32In));

        TO_STACK32(pti, punkThis32In, IUnknown *);
    }

    if(SUCCEEDED((SCODE)dwResult)) {
        // Execute the next THOP operation
        dwResult = EXECUTE_THOP1632(pti);
    }

    if((thop & THOP_OUT) && vpv) {
        vpvOut = 0;

        if(SUCCEEDED((SCODE)dwResult) && punkThis32Out) {
            // Obtain 16-bit proxy for the 32-bit interface
            if(punkOuter) {
                //Get the holder that was linked into TLS when the pUnkOuter
                //was being thunked in.
                pAggHolder = (TlsThkGetAggHolder())->pph;
                vpvOut = pti->pThkMgr->FindAggregate1632(vpvPreAlloc, punkOuter,
                                                         punkThis32Out, iidx, pAggHolder,
                                                         &dwStatus);
            }
            else {
                vpvOut = pti->pThkMgr->FindProxy1632(vpvPreAlloc, punkThis32Out,
                                                     NULL, iidx, &dwStatus);
            }

            if(vpvOut) {

                if((thop & THOP_OPMASK) == THOP_UNKINNER) {
                    if (dwStatus != FST_SHORTCUT) {
                        THUNK1632OBJ UNALIGNED *pProxy1632;
                        // Obtain the holder
                        pProxy1632 = FIXVDMPTR(vpvOut, THUNK1632OBJ);
                        pph = pProxy1632->pphHolder;

                        // Assert invariants in debug builds
                        thkAssert(pph->dwFlags & PH_AGGREGATEE);
                        thkAssert(dwStatus == FST_CREATED_NEW);

                        // Mark the proxy as representing inner unknown
                        pProxy1632->grfFlags = PROXYFLAG_PUNKINNER;
                    }
                }

                // Either the preallocated proxy was used and freed
                vpvPreAlloc = NULL;
            }
            else {
                pti->scResult = E_OUTOFMEMORY;
                dwResult = (DWORD)E_OUTOFMEMORY;
            }
            
            // Release the actual 32-bit interface. If a proxy to the 
            // 32-bit interface could not be created above, this could 
            // be the last release on the 32-bit interface
            punkThis32Out->Release();
        }

        // Set the OUT parameter
        pvpvOut = FIXVDMPTR(vpv, VPVOID);
        *pvpvOut = vpvOut;
        RELVDMPTR(vpv);

        thkDebugOut((DEB_ARGS, "%sOut1632 %s %p -> %p\n",
                     NestingLevelString(), IidIdxString(iidx), 
                     punkThis32Out, vpvOut));
    }
    
    if(punkThis32In) {
        if((thop & THOP_INOUT) == THOP_INOUT) {
            // IN-OUT parameter.
            thkAssert(vpvIn);

            // Release the 16-bit side interface
            ReleaseOnObj16(vpvIn);
        }
        else {
            // Just an IN parameter
            thkAssert(thop & THOP_IN);

#if DBG==1
            // Ensure that the following is not the last release
            // on the IN parameter
            THKSTATE thkstate;

            // Remember the current thunk state
            thkstate = pti->pThkMgr->GetThkState();

            // Set the thunk state to THKSTATE_VERIFYINPARAM
            pti->pThkMgr->SetThkState(THKSTATE_VERIFY16INPARAM);
#endif
            // Release the 32-bit side interface
            punkThis32In->Release();
#if DBG==1
            // Restore previous thunk state
            pti->pThkMgr->SetThkState(thkstate);
#endif
        }
    }

    // Cleanup
    if(vpvPreAlloc) {
        // Free preallocated proxy as it was not used
        pti->pThkMgr->FreeNewProxy1632(vpvPreAlloc, iidx);
    }

    if (bUnlinkAggHolder)
        TlsThkUnlinkAggHolder();

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_IFACEGEN_1632, public
//
//  Synopsis:   Thunks interfaces out through ppvs from 16->32
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    23-Feb-94       DrewB   Created
//
//----------------------------------------------------------------------------

DWORD Thop_IFACEGEN_1632(THUNKINFO *pti)
{
    IIDIDX iidx;
    THOP thop, thopOp, thopWeakOffset;
    VPVOID vpvIid;
    IUnknown *punkOuter;
    IID UNALIGNED const *piid;

    thop = *pti->pThop++;
    thopOp = thop & THOP_OPMASK;

    thkAssert(thopOp == THOP_IFACEGEN ||
              thopOp == THOP_IFACEGENOWNER);

    // The current thop byte indicates how many bytes to look
    // back in the stack to find the IID which identifies the
    // interface being returned
    INDEX_STACK16(pti, vpvIid, VPVOID, *pti->pThop, sizeof(VPVOID));
    pti->pThop++;

    piid = (IID const *)GetReadPtr16(pti, vpvIid, sizeof(IID const));
    if (piid == NULL)
    {
        pti->scResult = E_INVALIDARG;
    }
    else
    {
#if DBG == 1
        if (!IsValidIid(*piid))
        {
            pti->scResult = E_INVALIDARG;
        }
        else
#endif
        {
            iidx = IidToIidIdx(*piid);
        }

        WOWRELVDMPTR(vpvIid);
    }

	if (FAILED(pti->scResult))
		return pti->scResult;

    punkOuter = NULL;
    if (thopOp == THOP_IFACEGENOWNER)
    {
        // Obtain the outer unknown that is being passed to the 32 bit world
        thopWeakOffset = *pti->pThop++;
        INDEX_STACK32(pti, punkOuter, IUnknown *, thopWeakOffset);
        if(punkOuter) {
            // Aggregation across 16-32 boundary
            // Assert that the IID requested is IID_IUnknown
            thkAssert(iidx == THI_IUnknown || 
                      (pti->iidx==THI_IPSFactoryBuffer && pti->dwMethod==3));
            // Change thop to indicate that inner unknown is being thunked
            if(iidx == THI_IUnknown)
                thop = (thop & THOP_IOMASK) | THOP_UNKINNER;
        }
    }

    return ThunkInterface1632(pti, iidx, thop, punkOuter);
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_OIFI_1632, public
//
//  Synopsis:   Convert OLEINPLACEFRAMEINFO
//
//  Arguments:  [pti] - Thunking state information
//
//  Returns:    Appropriate status code
//
//  History:    26-May-94       DrewB   Created
//
//----------------------------------------------------------------------------

DWORD Thop_OIFI_1632( THUNKINFO *pti )
{
    DWORD dwResult;
    VPVOID vpoifi16;
    OIFI16 UNALIGNED *poifi16;
    OLEINPLACEFRAMEINFO oifi32;
    OLEINPLACEFRAMEINFO *poifi32;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_OIFI);
    thkAssert((*pti->pThop & THOP_IOMASK) == THOP_OUT);

    // OIFIs are out-only parameters for their contents
    // However, cb is in/out, so we need to copy cb on the way in
    // Furthermore, cb may not be set to a valid value, in which
    // case the documentation mentions that it should be assumed
    // that this is an OLE 2.0 OIFI
    // This thop simply ignores cb on the way in and always sets
    // it to the OLE 2.0 size
    // Since we're out-only, this always works since the number of
    // fields we thunk is the size of the structure that we give out
    // If OLEINPLACEFRAMEINFO is extended, this thop will break

    // Assert that OLEINPLACEFRAMEINFO is what we expect it to be
    thkAssert(sizeof(OLEINPLACEFRAMEINFO) == 20);

    GET_STACK16(pti, vpoifi16, VPVOID);

    poifi32 = NULL;
    if (vpoifi16 != 0)
    {
        poifi16 = (OIFI16 UNALIGNED *) GetWritePtr16(pti, vpoifi16, sizeof(OIFI16));
        if (NULL != poifi16)
        {
            poifi32 = &oifi32;

            // OIFI's may be an out only parameters but if the "cb" field is
            // "in" RPC doesn't slice up structs, so the whole thing is "in"
            // as well.  We are Thoping here but if we want this to match
            // the RPC sematics then we need to copy all the fields.

            poifi32 = &oifi32;
            poifi32->cb            = sizeof(OLEINPLACEFRAMEINFO);
            poifi32->fMDIApp       = (BOOL)poifi16->fMDIApp;
            poifi32->hwndFrame     = HWND_32(poifi16->hwndFrame);
            poifi32->cAccelEntries = (UINT)poifi16->cAccelEntries;

            if (poifi16->haccel == NULL)
            {
                poifi32->haccel = NULL;
            }
            else
            {
                // WOW will clean up any dangling accelerator tables when
                // tasks die
                poifi32->haccel = HACCEL_32(poifi16->haccel);
                if (poifi32->haccel == NULL)
                {
                    dwResult = (DWORD)E_UNEXPECTED;
                }
            }

            WOWRELVDMPTR(vpoifi16);
        }
    }

    TO_STACK32(pti, poifi32, OLEINPLACEFRAMEINFO *);

    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    if (poifi32 != NULL)
    {
        poifi16 = FIXVDMPTR(vpoifi16, OIFI16);

        if (SUCCEEDED(dwResult))
        {
            poifi16->cb            = sizeof(OIFI16);
            poifi16->fMDIApp       = (WORD)poifi32->fMDIApp;
            poifi16->hwndFrame     = HWND_16(poifi32->hwndFrame);
            poifi16->cAccelEntries =
                ClampULongToUShort(poifi32->cAccelEntries);

            if (poifi32->haccel == NULL)
            {
                poifi16->haccel = NULL;
            }
            else
            {
                // WOW will clean up any dangling accelerator tables when
                // tasks die
                poifi16->haccel = HACCEL_16(poifi32->haccel);
                if (poifi16->haccel == NULL)
                {
                    dwResult = (DWORD)E_UNEXPECTED;
                }
            }

#if DBG == 1
            if (SUCCEEDED(dwResult))
            {
                thkDebugOut((DEB_ARGS, "Out1632 OIFI: "
                             "%p {%d, %d, 0x%p, 0x%p, %d} -> "
                             "%p {%d, %d, 0x%04X, 0x%04X, %d}\n",
                             poifi32, poifi32->cb, poifi32->fMDIApp,
                             poifi32->hwndFrame, poifi32->haccel,
                             poifi32->cAccelEntries,
                             vpoifi16, poifi16->cb, (BOOL)poifi16->fMDIApp,
                             (DWORD)poifi16->hwndFrame, (DWORD)poifi16->haccel,
                             poifi16->cAccelEntries));
            }
#endif
        }

        if (FAILED(dwResult))
        {
            memset(poifi16, 0, sizeof(OIFI16));
        }

        RELVDMPTR(vpoifi16);
    }

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_STGMEDIUM_1632, public
//
//  Synopsis:   Converts 32-bit STGMEDIUM to 16-bit STGMEDIUM returned
//              structure
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    23-Feb-94       BobDay  Created
//
//----------------------------------------------------------------------------

DWORD Thop_STGMEDIUM_1632( THUNKINFO *pti )
{
    DWORD       dwResult;
    BOOL        fThopInput;
    BOOL        fThopOutput;
    VPVOID      vpstgmedium16;
    STGMEDIUM   UNALIGNED *lpstgmedium16;
    STGMEDIUM   *lpstgmedium32;
    STGMEDIUM   stgmedium32;
    DWORD       dwSize;
    SCODE       sc;
    BOOL        fReleaseParam;
    SHORT       fTransferOwnership;
    FORMATETC   *pfe;
    THOP        thopFeOffset;
    BOOL        fReversedTYMED_NULL = FALSE;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_STGMEDIUM);

    fThopInput  = IS_THOP_IN(pti);
    fThopOutput = IS_THOP_OUT(pti);

    //
    // We currently don't have any unmodified or inout thops for STGMEDIUMs
    //
    thkAssert( (fThopInput || fThopOutput) &&
               (fThopInput != fThopOutput) &&
               "STGMEDIUM must be input or output only" );

    // +2 thop byte indicates whether there's a FORMATETC to look at
    // or not
    // We need to reference this now before the stack is modified
    // by argument recovery
    thopFeOffset = *(pti->pThop+2);
    if (thopFeOffset > 0)
    {
        INDEX_STACK32(pti, pfe, FORMATETC *, thopFeOffset);
    }
    else
    {
        pfe = NULL;
    }

    GET_STACK16(pti, vpstgmedium16, VPVOID);

    // Next thop byte indicates whether there's an ownership transfer
    // argument or not
    pti->pThop++;
    fReleaseParam = (BOOL)*pti->pThop++;

    if (fReleaseParam)
    {
        GET_STACK16(pti, fTransferOwnership, SHORT);
    }
    else
    {
        fTransferOwnership = FALSE;
    }

    // Skip FORMATETC offset thop
    pti->pThop++;

    lpstgmedium32 = NULL;

    if ( vpstgmedium16 != 0 )
    {
        if ( fThopInput )
        {
            // This code supports GetDataHere() passing TYMED_NULL.  It then
            // behaves like GetData().  This is not per the OLE spec.
            // According to every OLE spec TYMED_NULL is an invalid type in
            // GetDataHere().   But AlexGo says that 16bit inproc servers
            // did support this, especially the Default Handler / Clipboard.

            lpstgmedium16 = (STGMEDIUM FAR *)GetReadPtr16(pti, vpstgmedium16,
                                                           sizeof(STGMEDIUM));

			thkAssert(lpstgmedium16);
			// To fix a prefix bug... vpstgmedium should never be invalid, but
			// if it is, we'll get back NULL, so we'll return E_UNEXPECTED.
			if (lpstgmedium16)
			{
				if (lpstgmedium16->tymed == TYMED_NULL &&
					!fTransferOwnership)
				{
					WOWRELVDMPTR(vpstgmedium16);
					
					memset(&stgmedium32, 0, sizeof(stgmedium32));
					thkAssert( TYMED_NULL == 0 );   // Don't need to set tymed to 0
					
					fThopInput = FALSE;
					fThopOutput = TRUE;
					fReversedTYMED_NULL = TRUE;
				}
				else
				{
					WOWRELVDMPTR(vpstgmedium16);
					
					sc = ConvertStgMed1632(pti, vpstgmedium16, &stgmedium32,
										   pfe, fTransferOwnership, &dwSize);
					if (SUCCEEDED(sc))
					{
						lpstgmedium32 = &stgmedium32;
					}
				}
			} 
			else 
			{
				return E_UNEXPECTED;
			}
        }

        if ( fThopOutput )
        {
            thkAssert( fThopOutput );

            lpstgmedium16 = (STGMEDIUM FAR *)GetWritePtr16(pti, vpstgmedium16,
                                                           sizeof(STGMEDIUM));
            if ( lpstgmedium16 != NULL )
            {
                lpstgmedium32 = &stgmedium32;
                WOWRELVDMPTR(vpstgmedium16);
            }

            // 32->16 sets tymed to TYMED_NULL before passing
            // on the STGMEDIUM because some apps incorrectly check for this
            // I'm assuming this isn't necessary for 16->32 because 32-bit
            // apps can't rely on tymed being NULL since nothing in the 32-bit
            // code sets it that way for out parameters
            // DrewB 5/30
        }
    }

    TO_STACK32(pti, lpstgmedium32, STGMEDIUM FAR *);

    if (fReleaseParam)
    {
        TO_STACK32(pti, (BOOL)fTransferOwnership, BOOL);
    }

    dwResult = EXECUTE_THOP1632(pti);

    if ( lpstgmedium32 != NULL)
    {
        if ( fThopInput )
        {
            if (!fTransferOwnership || FAILED(dwResult))
            {
                sc = CleanStgMed32(pti, lpstgmedium32, vpstgmedium16,
                                   dwSize, TRUE, pfe);
                if (FAILED(sc))
                {
                    dwResult = (DWORD)sc;
                }
            }
            else if (SUCCEEDED(dwResult))
            {
                lpstgmedium16 = FIXVDMPTR(vpstgmedium16, STGMEDIUM);
                if (lpstgmedium16->pUnkForRelease == NULL)
                {
                    RELVDMPTR(vpstgmedium16);
                    sc = CleanStgMed16(pti, vpstgmedium16, lpstgmedium32,
                                       0, FALSE, pfe);
                    thkAssert(SUCCEEDED(sc));
                }
                else
                {
                    RELVDMPTR(vpstgmedium16);
                }
            }
        }
        else
        {
            thkAssert( fThopOutput );

            if (SUCCEEDED(dwResult))
            {
                sc = ConvertStgMed3216(pti, lpstgmedium32, vpstgmedium16,
                                       pfe, FALSE, &dwSize);
                if (FAILED(sc))
                {
                    dwResult = (DWORD)sc;
                    ReleaseStgMedium(lpstgmedium32);
                }
                else if (lpstgmedium32->pUnkForRelease == NULL)
                {
                    sc = CleanStgMed32(pti, lpstgmedium32, vpstgmedium16,
                                       dwSize, FALSE, pfe);
                    thkAssert(SUCCEEDED(sc));
                }
            }

            // Clear the [out] parameters if the call failed.
            // Unless it had previously been an [in] parameter.
            // We don't want to erase the caller's [in] argument.

            if (FAILED(dwResult) && !fReversedTYMED_NULL)
            {
                lpstgmedium16 = FIXVDMPTR(vpstgmedium16, STGMEDIUM);
                memset(lpstgmedium16, 0, sizeof(STGMEDIUM));
                RELVDMPTR(vpstgmedium16);
            }
        }
    }

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   ConvertStatStg3216, public
//
//  Synopsis:   Converts a STATSTG
//
//  Arguments:  [pti] - Thunk info
//              [pss32] - STATSTG
//              [vpss16] - STATSTG
//              [vpstrPreAlloc] - Preallocated string memory or NULL
//              [cchPreAlloc] - Amount preallocated
//
//  Returns:    Appropriate status code
//
//  Modifies:   [vpss16]
//
//  History:    14-May-94       DrewB   Created
//
//  Notes:      Assumes input STATSTG memory is valid
//              Assumes task memory for the string
//
//----------------------------------------------------------------------------

SCODE ConvertStatStg3216(THUNKINFO *pti,
                         STATSTG *pss32,
                         VPVOID vpss16,
                         VPSTR vpstrPreAlloc,
                         UINT cchPreAlloc)
{
    STATSTG UNALIGNED *pss16;
    SCODE sc;
    VPSTR vpstr16;

    sc = ConvertTaskString3216(pti, pss32->pwcsName,
                               vpstrPreAlloc, cchPreAlloc,
                               &vpstr16);
    if (SUCCEEDED(sc))
    {
        pss16 = FIXVDMPTR(vpss16, STATSTG);
        memcpy(pss16, pss32, sizeof(STATSTG));
        pss16->pwcsName = (LPOLESTR)vpstr16;
        RELVDMPTR(vpss16);
    }

    return sc;
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_STATSTG_1632, public
//
//  Synopsis:   Converts 32-bit STATSTG to 16-bit STATSTG returned structure
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    23-Feb-94       BobDay  Created
//
//----------------------------------------------------------------------------
DWORD Thop_STATSTG_1632( THUNKINFO *pti )
{
    DWORD       dwResult;
    VPVOID      vpstatstg16;
    STATSTG UNALIGNED *lpstatstg16;
    VPSTR       vpstr;
    STATSTG     statstg32;
    STATSTG     *lpstatstg32;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_STATSTG);

    //
    // We currently don't have any input thops for STATSTGs
    //
    thkAssert( (*pti->pThop & THOP_IOMASK) == THOP_OUT &&
               "STATSTG must be output only" );

    GET_STACK16(pti, vpstatstg16, VPVOID);

    lpstatstg32 = NULL;

    lpstatstg16 = (STATSTG FAR *)GetWritePtr16( pti, vpstatstg16,
                                                sizeof(STATSTG) );
    if ( lpstatstg16 != NULL )
    {
        statstg32.pwcsName = NULL;
        lpstatstg32 = &statstg32;

        vpstr = (VPSTR)TaskMalloc16(CBSTRINGPREALLOC);
        if (vpstr == 0)
        {
            pti->scResult = E_OUTOFMEMORY;
        }

        WOWRELVDMPTR(vpstatstg16);
    }

    TO_STACK32(pti, lpstatstg32, STATSTG FAR *);

    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    if ( lpstatstg32 != NULL )
    {
        if ( SUCCEEDED(dwResult) )
        {
            SCODE sc;

            sc = ConvertStatStg3216(pti, &statstg32, vpstatstg16,
                                    vpstr, CWCSTRINGPREALLOC);
            if (FAILED(sc))
            {
                dwResult = sc;
            }
        }

        if (FAILED(dwResult))
        {
            TaskFree16(vpstr);

            lpstatstg16 = FIXVDMPTR(vpstatstg16, STATSTG);
            memset(lpstatstg16, 0, sizeof(STATSTG));
            RELVDMPTR(vpstatstg16);
        }
    }

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_DVTARGETDEVICE_1632, public
//
//  Synopsis:   Converts 16-bit DVTARGETDEVICE to 32-bit DVTARGETDEVICE
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    23-Feb-94       BobDay  Created
//
//----------------------------------------------------------------------------
DWORD Thop_DVTARGETDEVICE_1632( THUNKINFO *pti )
{
    DWORD               dwResult;
    UINT                uiSize;
    DVTARGETDEVICE      *lpdv32;
    VPVOID              vpdv16;
    SCODE               sc;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_DVTARGETDEVICE);

    //
    // We currently don't have any output thops for DVTARGETDEVICEs
    //
    thkAssert( (*pti->pThop & THOP_IOMASK) == THOP_IN &&
               "DVTARGETDEVICE must be input only" );

    //
    // Processing for a DVTARGETDEVICE FAR * as input
    //
    GET_STACK16(pti, vpdv16, VPVOID);

    lpdv32 = NULL;

    if ( vpdv16 != 0 )
    {
        sc = ConvertDvtd1632(pti, vpdv16, ArStack32, FrStack32, &lpdv32,
                             &uiSize);
        if (FAILED(sc))
        {
            pti->scResult = sc;
        }
    }

    TO_STACK32(pti, lpdv32, DVTARGETDEVICE FAR *);
    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    if (lpdv32 != NULL)
    {
        FrStack32(lpdv32, uiSize);
    }

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_FORMATETC_1632, public
//
//  Synopsis:   Converts 16-bit FORMATETC to 32-bit FORMATETC and back
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    24-Feb-94       BobDay  Created
//
//----------------------------------------------------------------------------

DWORD Thop_FORMATETC_1632( THUNKINFO *pti )
{
    DWORD               dwResult;
    BOOL                fThopInput;
    BOOL                fThopOutput;
    VPVOID              vpformatetc16;
    FORMATETC16 UNALIGNED *lpformatetc16;
    LPFORMATETC         lpformatetc32;
    FORMATETC           formatetc32;
    DVTARGETDEVICE      *lpdv32;
    SCODE               sc;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_FORMATETC);

    fThopInput  = IS_THOP_IN(pti);
    fThopOutput = IS_THOP_OUT(pti);

    //
    // We have only input and output thops, not both, or neither
    //
    thkAssert( (fThopInput || fThopOutput) &&
            (fThopInput != fThopOutput) &&
               "formatetc must be input or output only" );

    lpdv32 = NULL;

    GET_STACK16(pti, vpformatetc16, VPVOID);

    if ( vpformatetc16 == 0 )
    {
        lpformatetc32 = NULL;
    }
    else
    {
        lpformatetc32 = &formatetc32;

        if ( fThopInput )
        {
            sc = ConvertFetc1632(pti, vpformatetc16, lpformatetc32, FALSE);
            if (FAILED(sc))
            {
                pti->scResult = sc;
            }
        }
        else
        {
            thkAssert( fThopOutput );
            //
            // The below memset is needed at least for the DATA_S_SAMEFORMATETC
            // case.  This allows it to be cleaned up because all its pointers
            // will be null.
            //
            memset( &formatetc32, 0, sizeof(formatetc32) );
            lpformatetc16 = (LPFORMATETC16)GetWritePtr16(pti, vpformatetc16,
                                                         sizeof(FORMATETC16));
            WOWRELVDMPTR(vpformatetc16);
        }
    }

    TO_STACK32(pti, lpformatetc32, LPFORMATETC);
    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    if ( fThopInput )
    {
        if (lpformatetc32 != NULL && lpformatetc32->ptd != NULL)
        {
            TaskFree32(lpformatetc32->ptd);
        }
    }

    if ( fThopOutput && vpformatetc16 != NULL)
    {
        if (SUCCEEDED(dwResult))
        {
            sc = ConvertFetc3216(pti, lpformatetc32, vpformatetc16, TRUE);
            if (FAILED(sc))
            {
                dwResult = sc;
            }
        }

        if (FAILED(dwResult))
        {
            lpformatetc16 = FIXVDMPTR(vpformatetc16, FORMATETC16);
            memset(lpformatetc16, 0, sizeof(FORMATETC16));
            RELVDMPTR(vpformatetc16);
        }
    }

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_LOGPALETTE_1632, public
//
//  Synopsis:   Converts 16-bit LOGPALLETE to 32-bit LOGPALETTE
//              and converts 32-bit LOGPALETTE returned to 16-bit structure
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    23-Feb-94       BobDay  Created
//
//----------------------------------------------------------------------------

DWORD Thop_LOGPALETTE_1632 ( THUNKINFO *pti )
{
    DWORD         dwResult;
    UINT          uiSize;
    LPLOGPALETTE  lplogpal32;
    VPVOID        vplogpal16;
    LOGPALETTE UNALIGNED *lplogpal16;
    VPVOID        vp16;
    LPVOID UNALIGNED *lp16;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_LOGPALETTE);

    //
    // It must be either an input or output LOGPALETTE
    //
    thkAssert( ((*pti->pThop & THOP_IOMASK) == THOP_IN ||
                (*pti->pThop & THOP_IOMASK) == THOP_OUT) &&
               "Hey, LOGPALETTE can't be input and output!" );

    lplogpal32 = NULL;

    if ( (*pti->pThop & THOP_IN) != 0 )
    {
        //
        // Processing for a LPLOGPALETTE as input
        //
        GET_STACK16(pti, vplogpal16, VPVOID);

        if ( vplogpal16 != 0 )
        {
            // Copy over the input LOGPALETTE structure
            lplogpal16 = (LPLOGPALETTE)GetReadPtr16( pti, vplogpal16,
                                                     sizeof(LOGPALETTE) );

            if ( lplogpal16 != NULL )
            {
                uiSize = CBPALETTE(lplogpal16->palNumEntries);

                WOWRELVDMPTR(vplogpal16);

                lplogpal16 = (LPLOGPALETTE)GetReadPtr16(pti, vplogpal16,
                                                        uiSize);
                if ( lplogpal16 != NULL )
                {
                    lplogpal32 = (LPLOGPALETTE)CoTaskMemAlloc(uiSize);
                    if ( lplogpal32 == NULL )
                    {
                        pti->scResult = E_OUTOFMEMORY;
                    }
                    else
                    {
                        memcpy( lplogpal32, lplogpal16, uiSize );
                    }

                    WOWRELVDMPTR(vplogpal16);
                }
            }
        }

        TO_STACK32(pti, lplogpal32, LPLOGPALETTE);
        pti->pThop++;
        dwResult = EXECUTE_THOP1632(pti);

        if ( lplogpal32 )
        {
            CoTaskMemFree( lplogpal32 );
        }
    }
    else
    {
        //
        // Processing for LPLPLOGPALETTE as output
        //

        thkAssert((*pti->pThop & THOP_OUT) != 0);

        GET_STACK16(pti, vp16, VPVOID);

        vplogpal16 = (VPVOID)TaskMalloc16(CBPALETTE(NPALETTEPREALLOC));
        if (vplogpal16 == 0)
        {
            pti->scResult = E_OUTOFMEMORY;
        }

        TO_STACK32(pti, &lplogpal32, LPLOGPALETTE *);

        pti->pThop++;
        dwResult = EXECUTE_THOP1632(pti);

        if ( SUCCEEDED(dwResult) && lplogpal32 != NULL )
        {
            //
            // Copy the returned LOGPALETTE into 16-bit memory
            //
            uiSize = CBPALETTE(lplogpal32->palNumEntries);
            if (uiSize > CBPALETTE(NPALETTEPREALLOC))
            {
                TaskFree16(vplogpal16);
                vplogpal16 = (VPVOID)TaskMalloc16(uiSize);
                if ( vplogpal16 == 0 )
                {
                    dwResult = (DWORD)E_OUTOFMEMORY;
                }
            }

            if (vplogpal16 != 0)
            {
                lplogpal16 = (LPLOGPALETTE)WOWFIXVDMPTR(vplogpal16, uiSize);
                if ( lplogpal16 == NULL )
                {
                    dwResult = (DWORD)E_UNEXPECTED;
                    vplogpal16 = 0;
                }
                else
                {
                    memcpy( lplogpal16, lplogpal32, uiSize );

                    WOWRELVDMPTR(vplogpal16);
                }
            }

            TaskFree32( lplogpal32 );
        }
        else
        {
            TaskFree16(vplogpal16);
            vplogpal16 = 0;
        }

        //
        // Update the value pointed to by the parameter on the 16-bit stack
        //
        lp16 = FIXVDMPTR(vp16, LPVOID);
        if ( lp16 == NULL )
        {
            dwResult = (DWORD)E_UNEXPECTED;
        }
        else
        {
            *lp16 = (LPVOID)vplogpal16;
            RELVDMPTR(vp16);
        }
    }
    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_CRGIID_1632, public
//
//  Synopsis:   Converts 16-bit CRGIID to 32-bit CRGIID structure
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    23-Feb-94       BobDay  Created
//
//----------------------------------------------------------------------------
DWORD Thop_CRGIID_1632( THUNKINFO *pti )
{
    DWORD       dwResult;
    DWORD       dwCount;
    VPVOID      vpiid16;
    IID UNALIGNED *lpiid16;
    IID         *lpiid32;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_CRGIID);

    //
    // We currently don't have any output thops for CRGIIDs
    //
    thkAssert( (*pti->pThop & THOP_IOMASK) == 0 &&
               "CRGIID must be unmodified only" );

    GET_STACK16(pti, dwCount, DWORD);
    GET_STACK16(pti, vpiid16, VPVOID);

    lpiid32 = NULL;

    if ( vpiid16 != 0 )
    {
        lpiid16 = (IID UNALIGNED *)GetReadPtr16( pti, vpiid16,
                                                 dwCount*sizeof(IID) );
        if ( lpiid16 != NULL )
        {
            lpiid32 = (IID FAR *)CoTaskMemAlloc( dwCount * sizeof(IID) );
            if ( lpiid32 == NULL )
            {
                pti->scResult = E_OUTOFMEMORY;
            }
            else
            {
                memcpy( lpiid32, lpiid16, dwCount*sizeof(IID) );
            }

            WOWRELVDMPTR(vpiid16);
        }
    }

    TO_STACK32(pti, dwCount, DWORD);
    TO_STACK32(pti, lpiid32, IID FAR *);

    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    if ( lpiid32 != NULL )
    {
        CoTaskMemFree( lpiid32 );
    }
    return( dwResult );
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_INTERFACEINFO_1632, public
//
//  Synopsis:   Converts an INTERFACEINFO
//
//  Arguments:  [pti] - Thunking state information
//
//  Returns:    Appropriate status code
//
//  History:    19-May-94       DrewB   Created
//
//----------------------------------------------------------------------------

DWORD Thop_INTERFACEINFO_1632(THUNKINFO *pti)
{
    INTERFACEINFO *pii32;
    INTERFACEINFO ii32;
    INTERFACEINFO16 UNALIGNED *pii16;
    VPVOID vpii16;
    DWORD dwResult;
    IUnknown *punk32;
    VPVOID vpvUnk16;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_INTERFACEINFO);
    thkAssert((*pti->pThop & THOP_INOUT) == THOP_IN);

    pii32 = NULL;
    punk32 = NULL;

    GET_STACK16(pti, vpii16, VPVOID);
    if (vpii16 != 0)
    {
        pii16 = (INTERFACEINFO16 UNALIGNED *)
            GetReadPtr16(pti, vpii16, sizeof(INTERFACEINFO16));
        if (pii16 != NULL)
        {
            if (pii16->pUnk != NULL)
            {
                vpvUnk16 = pii16->pUnk;

                WOWRELVDMPTR(vpii16);

                punk32 =
                    pti->pThkMgr->FindProxy3216(NULL, vpvUnk16, NULL,
                                                INDEX_IIDIDX(THI_IUnknown),
                                                FALSE, NULL);
                if (punk32 == NULL)
                {
                    pti->scResult = E_OUTOFMEMORY;
                }

                pii16 = FIXVDMPTR(vpii16, INTERFACEINFO16);
            }

            pii32 = &ii32;
            pii32->pUnk = punk32;
            pii32->iid = pii16->iid;
            pii32->wMethod = pii16->wMethod;

            WOWRELVDMPTR(vpii16);

            thkDebugOut((DEB_ARGS,
                         "In1632  INTERFACEINFO: %p -> %p {%p (%p), %s, %u}\n",
                         vpii16, pii32, pii32->pUnk, pii16->pUnk,
                         IidOrInterfaceString(&pii32->iid), pii32->wMethod));
        }
    }

    TO_STACK32(pti, pii32, INTERFACEINFO *);

    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    if(punk32) {        
        // Release the 32-bit interface as it is an IN parameter
        punk32->Release();
    }

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_RETURNTYPE_1632, public
//
//  Synopsis:   Thunks the return value of a call
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    24-Feb-94       DrewB   Created
//
//  Notes:      This thunk assumes that the return value will always fit
//              in 32 bits and that the thops for it are only one thop
//              long.  This fits the existing APIs and methods
//
//----------------------------------------------------------------------------

DWORD Thop_RETURNTYPE_1632(THUNKINFO *pti)
{
    THOP thops[2];
    DWORD dwResult;
    ALIAS alias;
    VPVOID vpvPreAlloc = NULL;
    IIDIDX iidx;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_RETURNTYPE);
    thkAssert((*pti->pThop & THOP_IOMASK) == 0);

    pti->fResultThunked = TRUE;

    pti->pThop++;

    // Remember return type thop
    thops[0] = *pti->pThop++;
    if ((thops[0] & THOP_OPMASK) == THOP_COPY ||
        (thops[0] & THOP_OPMASK) == THOP_IFACE ||
        (thops[0] & THOP_OPMASK) == THOP_ALIAS32)
    {
        thops[1] = *pti->pThop++;
    }

    // Preallocate any necessary resources
    switch(thops[0])
    {
    case THOP_IFACE | THOP_IN:
        iidx = INDEX_IIDIDX(thops[1]);
        if ((vpvPreAlloc =
             pti->pThkMgr->CanGetNewProxy1632(iidx)) == NULL)
        {
            pti->scResult = E_OUTOFMEMORY;
        }
        break;

    case THOP_ALIAS32:
        thkAssert(thops[1] == ALIAS_CREATE);

        // The value used for preallocation doesn't really matter
        // as long as it's unique and not INVALID_VALUE
        // In our case we know that we won't have to deal with nested
        // preallocations so uniqueness is not as much of an issue
        // By using INVALID_HANDLE_VALUE, we can be sure that there
        // won't already be an entry with that value already in the
        // alias table since we're aliasing handles
        alias = gAliases32.AddValue((DWORD)INVALID_HANDLE_VALUE);
        if (alias == INVALID_ALIAS)
        {
            pti->scResult = E_OUTOFMEMORY;
        }
        break;
    }

    dwResult = EXECUTE_THOP1632(pti);

    // Now that we have the return value thunk it from 32->16
    // We must use pti->scResult to check for failure rather than
    // dwResult because dwResult may not be an SCODE

    switch(thops[0])
    {
    case THOP_COPY:
        // Only handle DWORD copies
        thkAssert(thops[1] == sizeof(DWORD));
        break;

    case THOP_SHORTLONG:
        // For boolean results, not necessary to clamp
        dwResult = (DWORD)(SHORT)*(LONG *)&dwResult;
        break;

    case THOP_IFACE | THOP_IN:
        // Thunking an interface as a return value is completly broken
        // First, such an interface needs to be thunked as an OUT parameter
        // which I am fixing below. Second, the IID of the interface being
        // thunked needs to be in the THOP string for proper thunking of
        // interface. The only known case where an interface is returned
        // is IRpcStubBuffer::IsIIDSupported() and the interface returned
        // is of type IRpcStubBuffer, not IUnknown. As this method is not
        // used in the curremt COM code, I am not changing THOP strings
        // to reflect the IID of the interface being thunked
        //            Gopalk     Mar 27, 97
        if (dwResult != 0)
        {
            if (FAILED(pti->scResult))
            {
                dwResult = 0;
            }
            else
            {
                IUnknown *punk = (IUnknown *) dwResult;
                dwResult =
                    (DWORD)pti->pThkMgr->FindProxy1632(vpvPreAlloc,
                                                       (IUnknown *)dwResult, NULL,
                                                       iidx, NULL);
                
                // Release actual interface as it is an OUT parameter
                // This could be the last release on the interface if the
                // above call failed;
                punk->Release();
                thkAssert(dwResult);

                thkDebugOut((DEB_ARGS, "Ret1632 %s %p\n",
                             inInterfaceNames[thops[1]].pszInterface,
                             dwResult));
            }
        }
        else
        {
            pti->pThkMgr->FreeNewProxy1632(vpvPreAlloc, iidx);
        }
        break;

    case THOP_ALIAS32:
        if (dwResult != 0)
        {
            if (FAILED(pti->scResult))
            {
                dwResult = 0;
            }
            else
            {
                gAliases32.SetValue(alias, dwResult);

                thkDebugOut((DEB_ARGS, "Ret1632 ALIAS32: 0x%08lX -> 0x%04lX\n",
                             dwResult, alias));

                dwResult = (DWORD)alias;
            }
        }
        break;

    default:
        thkAssert(!"Unhandled 1632 return type");
        break;
    }

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_IFACE_1632, public
//
//  Synopsis:   Thunks a known interface pointer
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    24-Feb-94       DrewB   Created
//
//----------------------------------------------------------------------------

DWORD Thop_IFACE_1632(THUNKINFO *pti)
{
    IIDIDX iidx;
    THOP thop, thopOp, thopWeakOffset;
    IUnknown *punkOuter;

    thop = *pti->pThop++;
    thopOp = thop & THOP_OPMASK;

    thkAssert(   thopOp == THOP_IFACE
              || thopOp == THOP_IFACEOWNER
              || thopOp == THOP_IFACENOADDREF
              || thopOp == THOP_UNKOUTER);

    iidx = INDEX_IIDIDX(*pti->pThop++);

    // There's a bit of a special case here in that IMalloc is
    // not thunked so it doesn't have a real index but it's used
    // in thop strings so it has a fake index to function as a placeholder
    // The fake index is THI_COUNT so allow that in the assert
    thkAssert(IIDIDX_INDEX(iidx) >= 0 && IIDIDX_INDEX(iidx) <= THI_COUNT);
    thkAssert(thopOp != THOP_UNKOUTER || iidx == THI_IUnknown);

    punkOuter = NULL;
    if (   thopOp == THOP_IFACEOWNER
        || thopOp == THOP_IFACENOADDREF)
    {
        thopWeakOffset = *pti->pThop++;
        INDEX_STACK32(pti, punkOuter, IUnknown *, thopWeakOffset);
        if(punkOuter && (thopOp==THOP_IFACEOWNER)) {
            // Aggregation across 16-32 boundary
            // Assert invariants
            thkAssert(iidx == THI_IRpcProxyBuffer || iidx == THI_IRpcProxy);
            // Change thop to indicate that inner unknown is being thunked
            thop = (thop & THOP_IOMASK) | THOP_UNKINNER;
        }
    }

    return ThunkInterface1632(pti, iidx, thop, punkOuter);
}

typedef struct tagOLESTREAMOBJECT
{
    OLESTREAM   os;
    VPVOID      vpolestream16;
} OLESTREAMOBJECT, FAR * LPOLESTREAMOBJECT;

#define OLESTREAM_GET 0
#define OLESTREAM_PUT 1


//+---------------------------------------------------------------------------
//
//  Function:   OLESTREAM_Callback, private
//
//  Synopsis:   Handles callbacks into 16-bit world for OLESTREAM methods
//
//  Arguments:  [dwMethod] - Index of method to invoke
//              [lposo]    - Pointer to 32 LPOLESTREAM
//              [lpv]      - Pointer to 32 bit buffer
//              [dwCount]  - Size of 32 bit buffer
//
//
//  Returns:    Appropriate status code
//
//  History:    11-Mar-94   BobDay  Created
//              29-May-94   TerryRu Converted to call WOWCallBackEx directly.
//
//----------------------------------------------------------------------------

DWORD OLESTREAM_Callback( DWORD dwMethod,
                          LPOLESTREAM lpos,
                          LPVOID lpv,
                          DWORD dwCount )
{
    const DWORD             cbStack     = sizeof( DWORD ) +
        sizeof( VPVOID ) + sizeof( VPVOID );

    BYTE                    b32Args[cbStack];
    DWORD                   dwResult;

    VPVOID                  vpvVtbl16;
    VTBLFN                  vpfn16;

    VPVOID                  vpolestream16;
    LPOLESTREAMOBJECT       lposo;

    VPVOID                  vp16;
    LPVOID                  lp16;


    lposo = (LPOLESTREAMOBJECT)lpos;
    vpolestream16 = lposo->vpolestream16;

    // Get pointer to 16 bit this pointer

    vpvVtbl16 =  (VPVOID)*FIXVDMPTR( vpolestream16,  VPVOID );
    RELVDMPTR(vpolestream16);
    vpfn16    =  (VTBLFN)*FIXVDMPTR( vpvVtbl16+dwMethod*sizeof(VPVOID),
                                     VPVOID );
    RELVDMPTR(vpvVtbl16+dwMethod*sizeof(VPVOID));

    //
    // now thop the  IN 32 bit-block of memory to 16 bit block
    //

    vp16 = WgtAllocLock( GMEM_MOVEABLE, dwCount, NULL );
    if ( vp16 == NULL )
    {
        return (DWORD) E_OUTOFMEMORY;
    }

    if ( dwMethod == OLESTREAM_PUT )
    {
        lp16 = WOWFIXVDMPTR( vp16, dwCount );
        memcpy( lp16, lpv, dwCount );
        WOWRELVDMPTR(vp16);
    }

    // setup 32 bit arguements.
    *(DWORD *)(b32Args)             = dwCount;
    *(VPVOID *)(b32Args+4)          = vp16;
    *(VPVOID *)(b32Args+8)          = vpolestream16;

    if ( !CallbackTo16Ex( (DWORD)vpfn16, WCB16_PASCAL, cbStack, b32Args,
                         &dwResult) )
    {
        dwResult = (DWORD)E_UNEXPECTED;
    }

    if ( dwMethod == OLESTREAM_GET )
    {

        lp16 = WOWFIXVDMPTR( vp16, dwCount );
        memcpy( (LPVOID) lpv, lp16, dwCount );
        WOWRELVDMPTR(vp16);

    }

    WgtUnlockFree(vp16);

    thkDebugOut((DEB_INVOKES, "OLESTREAM_Callback returns 0x%08lX\n",
                 dwResult));

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   OLESTREAM_Get_Proxy, private
//
//  Synopsis:   Handles callbacks into 16-bit world for OLESTREAM::Get
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    11-Mar-94   BobDay  Created
//              29-May-94   TerryRu Now calls OLESTREAM::Get using Pascal
//                                  calling conventions.
//
//----------------------------------------------------------------------------

DWORD OLESTREAM_Get_Proxy(
    LPOLESTREAM lpos,
    void FAR *  lpv,
    DWORD       dwCount
)
{
    return OLESTREAM_Callback( OLESTREAM_GET, lpos, lpv, dwCount );
}

//+---------------------------------------------------------------------------
//
//  Function:   OLESTREAM_Put_Proxy, private
//
//  Synopsis:   Handles callbacks into 16-bit world for OLESTREAM::Put
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    11-Mar-94   BobDay  Created
//              29-May-94   TerryRu Now call OLESTREAM::Put using pascal
//              calling conventions.
//
//----------------------------------------------------------------------------

DWORD OLESTREAM_Put_Proxy(
    LPOLESTREAM lpos,
    const void FAR* lpv,
    DWORD       dwCount
)
{
    return OLESTREAM_Callback( OLESTREAM_PUT, lpos,(LPVOID) lpv, dwCount );
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_OLESTREAM_1632, public
//
//  Synopsis:   Thunks an OLESTREAM parameter from 16-bit to 32-bit
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    14-Mar-94   BobDay  Created
//
//----------------------------------------------------------------------------

_OLESTREAMVTBL osVtbl =
{
    OLESTREAM_Get_Proxy,
    OLESTREAM_Put_Proxy
};

DWORD Thop_OLESTREAM_1632(THUNKINFO *pti)
{
    OLESTREAMOBJECT osObject;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_OLESTREAM);

    //
    // Ignore the THOP_INPUT/THOP_OUTPUT, it is always just an interface
    //

    osObject.os.lpstbl = &osVtbl;
    GET_STACK16(pti, osObject.vpolestream16, VPVOID);

    TO_STACK32(pti, &osObject, LPOLESTREAMOBJECT );

    pti->pThop++;
    return EXECUTE_THOP1632(pti);
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_RPCOLEMESSAGE_1632, public
//
//  Synopsis:   Converts 16-bit RPCOLEMESSAGE to 32-bit RPCOLEMESSAGE
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    23-Feb-94       BobDay  Created
//      28-May-94       JohannP Rewritten
//      13-Aug-94       Rickhi  made it work for GetBuffer when the
//                              buffer size grows, commented better
//
//  CODEWORK:   this routine is inefficient. since it cant tell why it was
//      called (GetBuffer/SendReceive/Invoke/FreeBuffer) it always
//      copies the data, when it only really needs to in Invoke and
//      in SendReceive.
//
//  Context: This routine will "Thop" a client side RPCOLEMESSGE (aka "rom")
//      three times.  The first time for the "getbuffer" call, the second
//      time for the "SendRecieve", and the third time for the "freebuffer".
//      This make it confusing, some calls allocate a buffer but don't
//      free it.  Other calls free a buffer they didn't allocate.  A good
//      way to see what is happening is to step through several calls to
//      this routine with a debugger and note the pointer values.
//
//----------------------------------------------------------------------------
DWORD Thop_RPCOLEMESSAGE_1632( THUNKINFO *pti )
{
    DWORD           dwResult;
    PRPCOLEMESSAGE  prom32;
    VPVOID          vprom16;
    RPCOLEMESSAGE UNALIGNED *prom16;
    LPVOID          lp16;
    RPCOLEMESSAGE   rom32;
    BOOL            fAllocNew = FALSE;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_RPCOLEMESSAGE);

    //
    // We currently have only INOUT RPCOLEMESSAGE
    //
    thkAssert( (*pti->pThop & THOP_IOMASK) == (THOP_IN | THOP_OUT) &&
               "RPCOLEMESSAGE must be input/output only" );

    //
    // Processing for a RPCOLEMESSAGE FAR * as input/output
    //
    GET_STACK16(pti, vprom16, VPVOID);

    prom32 = NULL;
    if ( vprom16 != 0 )
    {
        // Copy over the input RPCOLEMESSAGE structure
        prom16 = (RPCOLEMESSAGE UNALIGNED *)
            GetReadWritePtr16( pti, vprom16, sizeof(RPCOLEMESSAGE) );
        if ( prom16 != NULL )
        {
            // Note: ROM_THUNK_FIELD(prom) holds the pointer to the 32 bit rom
            //        in case the buffer is not NULL

            // Note: this assert is not valid when a fault happens on the
            //        server side. In that case, the return buffer is NULLed
            //        by the 16bit stub but the THUNK_FIELD is non-null.

            //thkAssert((prom16->Buffer == NULL &&
            //           ROM_THUNK_FIELD(prom16) == NULL) ||
            //          (prom16->Buffer != NULL &&
            //           ROM_THUNK_FIELD(prom16) != NULL));

            if (prom16->Buffer != NULL)
            {
                prom32 = (RPCOLEMESSAGE *)ROM_THUNK_FIELD(prom16);

                if ( prom32->Buffer != NULL )
                {
                    // we use the min size of the two buffers because when
                    // the stub (server side) calls GetBuffer he is supplying
                    // the old pBuffer with the new (and potentially larger)
                    // cbBuffer

                    DWORD cbSizeMin = (prom16->cbBuffer <= prom32->cbBuffer) ?
                        prom16->cbBuffer :  prom32->cbBuffer;

                    lp16 = (LPVOID)GetReadPtr16(pti,
                                                (VPVOID)prom16->Buffer,
                                                cbSizeMin);
                    if (lp16 == NULL)
                    {
                        prom32 = NULL;
                    }
                    else
                    {
                        memcpy( prom32->Buffer, lp16, prom32->cbBuffer );
                        WOWRELVDMPTR((VPVOID)prom16->Buffer);
                    }
                }

				if (prom32)
				{
					// the stub might be asking for a larger buffer for output
					// parameters than it was given for input parameters. We have
					// to figure that out here by comparing the 16bit size with
					// the 32bit size.

					fAllocNew = (prom32->cbBuffer < prom16->cbBuffer);
					prom32->cbBuffer = prom16->cbBuffer;
				}
				else
				{
					fAllocNew = FALSE;
				}
            }
            else
            {
                rom32 = *prom16;
                prom32 = &rom32;
            }

            WOWRELVDMPTR(vprom16);
        }
    }

    TO_STACK32(pti, prom32, PRPCOLEMESSAGE);
    pti->pThop++;
    dwResult = EXECUTE_THOP1632(pti);

    if ( prom32 != NULL )
    {
        prom16 = (RPCOLEMESSAGE UNALIGNED *)
            GetReadWritePtr16( pti, vprom16, sizeof(RPCOLEMESSAGE) );
        if ( prom16 == NULL )
        {
            dwResult = (DWORD)E_UNEXPECTED;
        }
        else
        {
            if (SUCCEEDED(dwResult))
            {
                if (prom32->Buffer == NULL)
                {
                    //  RELEASE THE BUFFER AND ROM:
                    // Free the 16 bit buffer, copy the 32 bit rom into
                    // the 16 bit rom and free the 32bit rom, if it was
                    // allocated
                    //
                    if (prom16->Buffer != 0)
                    {
                        TaskFree16((VPVOID)prom16->Buffer);
                    }

                    *prom16 = *prom32;

                    if (prom32 != &rom32)
                    {
                        TaskFree32(prom32);
                        prom32 = NULL;
                    }
                    ROM_THUNK_FIELD(prom16) = NULL;
                }
                else
                {
                    // ALLOCATE AND/OR COPYBACK THE BUFFER AND ROM:
                    RPCOLEMESSAGE *pr32;
                    LPVOID pBuffer;

                    // Create a message to save the 32-bit message in
                    // Use the existing one in the thunk field if we can
                    if (ROM_THUNK_FIELD(prom16) == NULL)
                    {
                        pr32 = (RPCOLEMESSAGE *)
                            TaskMalloc32(sizeof(RPCOLEMESSAGE));
                    }
                    else
                    {
                        pr32 = (RPCOLEMESSAGE *)ROM_THUNK_FIELD(prom16);
                    }
                    *pr32 = *prom32;

                    //
                    // Allocate an output buffer and copy the buffer back
                    //
                    if (   (prom16->Buffer == NULL)
                        || (prom16->cbBuffer < prom32->cbBuffer)
                        || fAllocNew)
                    {
                        if (prom16->Buffer != NULL)
                        {
                            TaskFree16((VPVOID) prom16->Buffer);
                        }

                        pBuffer = (LPVOID)TaskMalloc16(prom32->cbBuffer );
                    }
                    else
                    {
                        pBuffer = prom16->Buffer;
                    }

                    *prom16 = *prom32;
                    prom16->Buffer = pBuffer;
                    ROM_THUNK_FIELD(prom16) = pr32;

                    if (prom16->Buffer == NULL)
                    {
                        dwResult = (DWORD)E_OUTOFMEMORY;
                    }
                    else
                    {
                        lp16 = (LPVOID)GetReadPtr16(pti,
                                                    (VPVOID)prom16->Buffer,
                                                    prom16->cbBuffer);
                        if ( lp16 == NULL )
                        {
                            dwResult = (DWORD)E_UNEXPECTED;
                        }
                        else
                        {
                            memcpy( lp16, prom32->Buffer,
                                    prom32->cbBuffer );
                            WOWRELVDMPTR((VPVOID)prom16->Buffer);
                        }
                    }
                }
            }

            WOWRELVDMPTR(vprom16);
        }
    }

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_ALIAS32_1632, public
//
//  Synopsis:   Handles 16-bit aliases to 32-bit quantities
//
//  Arguments:  [pti] - Thunking state information
//
//  Returns:    Appropriate status code
//
//  History:    27-May-94       DrewB   Created
//
//----------------------------------------------------------------------------

DWORD Thop_ALIAS32_1632(THUNKINFO *pti)
{
    ALIAS alias;
    DWORD dwValue;
    THOP thopAction;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_ALIAS32);
    thkAssert((*pti->pThop & THOP_IOMASK) == 0);

    pti->pThop++;

    GET_STACK16(pti, alias, ALIAS);

    // Second byte indicates how the alias should be handled
    thopAction = *pti->pThop++;

    if (alias != 0)
    {
        switch(thopAction)
        {
        case ALIAS_RESOLVE:
            dwValue = gAliases32.AliasValue(alias);
            break;

        case ALIAS_REMOVE:
            dwValue = gAliases32.AliasValue(alias);
            gAliases32.RemoveAlias(alias);
            break;

        default:
            thkAssert(!"Default hit in Thop_ALIAS32_1632");
			dwValue = 0;
            break;
        }
    }
    else
    {
        dwValue = 0;
    }

    thkDebugOut((DEB_ARGS, "In1632  ALIAS32: 0x%04X -> 0x%08lX\n",
                 alias, dwValue));

    TO_STACK32(pti, dwValue, DWORD);

    return EXECUTE_THOP1632(pti);
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_ENUM_1632, public
//
//  Synopsis:   Thunks Enum::Next parameters
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    1-Mar-94        BobDay  Created
//
//  Notes:      This thunk is the start of a 2-byte thop.  The next thop
//              byte references a function in the enumerator table, rather
//              than the standard thop table.
//
//----------------------------------------------------------------------------

DWORD Thop_ENUM_1632(THUNKINFO *pti)
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_ENUM);
    thkAssert((*pti->pThop & THOP_IOMASK) == 0);

    //
    // Get then next thop byte and execute it as a Enum thop
    //
    pti->pThop++;
    return EXECUTE_ENUMTHOP1632(pti);
}

//+---------------------------------------------------------------------------
//
//  Function:   CallbackProcessing_1632, public
//
//  Synopsis:   Thunks IOleObject::Draw pfnContinue & DWORD parameters
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    3-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------
typedef struct tagCallbackControl
{
    DWORD   dwContinue;
    VPVOID  vpfn16;
} CALLBACKCONTROL;

BOOL CallbackProcessing_1632( DWORD dwContinue )
{
    DWORD           dwResult;
    CALLBACKCONTROL *lpcbc;

    lpcbc = (CALLBACKCONTROL *)dwContinue;

    // The callback function must be FAR PASCAL
    // It's declared CALLBACK in the methods so this is ensured
    dwResult = CallbackTo16( lpcbc->vpfn16, lpcbc->dwContinue );

    return (BOOL)((WORD)dwResult);  // Ignore HIWORD
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_CALLBACK_1632, public
//
//  Synopsis:   Thunks IOleObject::Draw pfnContinue & DWORD parameters
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    3-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

DWORD Thop_CALLBACK_1632(THUNKINFO *pti)
{
    VPVOID          vpfn16;
    DWORD           dwContinue;
    CALLBACKCONTROL cbc;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_CALLBACK);
    thkAssert((*pti->pThop & THOP_IOMASK) == 0);

    GET_STACK16(pti, vpfn16, VPVOID);
    GET_STACK16(pti, dwContinue, DWORD);

    if ( vpfn16 == 0 )
    {
        TO_STACK32(pti, NULL, LPVOID);
        TO_STACK32(pti, dwContinue, DWORD);
    }
    else
    {
        cbc.vpfn16     = vpfn16;
        cbc.dwContinue = dwContinue;

        TO_STACK32(pti, CallbackProcessing_1632, LPVOID);
        TO_STACK32(pti, (DWORD)&cbc, DWORD);
    }

    pti->pThop++;
    return EXECUTE_THOP1632(pti);
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_CLSCONTEXT_1632, public
//
//  Synopsis:   Converts a class context flags DWORD
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    29-Jun-94       DrewB   Created
//
//----------------------------------------------------------------------------

DWORD Thop_CLSCONTEXT_1632(THUNKINFO *pti)
{
    DWORD dwClsContext;

    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_CLSCONTEXT);
    thkAssert((*pti->pThop & THOP_IOMASK) == 0);

    GET_STACK16(pti, dwClsContext, DWORD);

    // When passing a 16-bit class context on to 32-bits,
    // add on a flag to indicate that this is a 16-bit request
    // in the inproc server case

    if (dwClsContext & CLSCTX_INPROC_SERVER)
    {
        dwClsContext |= CLSCTX_INPROC_SERVER16;
    }

    TO_STACK32(pti, dwClsContext, DWORD);

    pti->pThop++;
    return EXECUTE_THOP1632(pti);
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_FILENAME_1632, public
//
//  Synopsis:   Converts a filename string
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    24-Aug-94       DrewB   Created
//
//----------------------------------------------------------------------------

DWORD Thop_FILENAME_1632(THUNKINFO *pti)
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_FILENAME);

    // Can be in or out only
    thkAssert((*pti->pThop & THOP_IOMASK) == THOP_IN ||
              (*pti->pThop & THOP_IOMASK) == THOP_OUT);

    if ((*pti->pThop & THOP_IN) != 0)
    {
        // No special processing is necessary for filenames going
        // from 16->32 since it isn't possible for 16-bit code to
        // generate a filename which can't be handled in 32-bits

        return ThunkInString1632(pti);
    }
    else
    {
        thkAssert((*pti->pThop & THOP_OUT) != 0);

        // Convert filenames going from 32->16 to short filenames
        // to avoid any possible problems with non-8.3 names.

        return ThunkOutString1632(pti, TRUE);
    }
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_SIZEDSTRING_1632, public
//
//  Synopsis:   Converts strings which cannot exceed a given length
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    02-Sep-94       DrewB   Created
//
//----------------------------------------------------------------------------

DWORD Thop_SIZEDSTRING_1632(THUNKINFO *pti)
{
    thkAssert((*pti->pThop & THOP_OPMASK) == THOP_SIZEDSTRING);
    thkAssert((*pti->pThop & THOP_IOMASK) == THOP_IN);

    // For 16->32, there are no limits on string length so
    // thunk the string normally

    // Advance once to account for the length byte
    // ThunkInString will advance again

    pti->pThop++;
    return ThunkInString1632(pti);
}

#define THOP_FN(x)  Thop_ ## x ## _1632

DWORD (*CONST aThopFunctions1632[])(THUNKINFO *) =
{

                                // x = Implemented
                                // ? = Mysteriously not needed
                                //   = Left to do
                                //
                                // ^
                                // |
                                // +===+
                                //     |
                                //     v
                                //
    ThunkCall1632,                  // x Terminating THOP
    Thop_ShortToLong_1632,          // x SHORTLONG
    Thop_WordToDword_1632,          // x WORDDWORD
    Thop_Copy_1632,                 // x COPY
    THOP_FN(LPSTR),                 // x LPSTR
    THOP_FN(LPLPSTR),               // x LPLPSTR
    THOP_FN(BUFFER),                // x BUFFER
    Thop_UserHandle_1632,           // x HUSER
    Thop_GdiHandle_1632,            // x HGDI
    THOP_FN(SIZE),                  // x SIZE
    THOP_FN(RECT),                  // x RECT
    THOP_FN(MSG),                   // x MSG
    THOP_FN(HRESULT),               // x HRESULT
    THOP_FN(STATSTG),               // x STATSTG
    THOP_FN(DVTARGETDEVICE),        // x DVTARGETDEVICE
    THOP_FN(STGMEDIUM),             // x STGMEDIUM
    THOP_FN(FORMATETC),             // x FORMATETC
    THOP_FN(HACCEL),                // x HACCEL
    THOP_FN(OIFI),                  // x OLEINPLACEFRAMEINFO
    THOP_FN(BINDOPTS),              // x BIND_OPTS
    THOP_FN(LOGPALETTE),            // x LOGPALETTE
    THOP_FN(SNB),                   // x SNB
    THOP_FN(CRGIID),                // x CRGIID
    THOP_FN(OLESTREAM),             // x OLESTREAM
    THOP_FN(HTASK),                 // x HTASK
    THOP_FN(INTERFACEINFO),         // x INTERFACEINFO
    THOP_FN(IFACE),                 // x IFACE
    THOP_FN(IFACE),                 // x IFACEOWNER
    THOP_FN(IFACE),                 // x IFACENOADDREF
    Thop_ERROR_1632,                // x IFACECLEAN
    THOP_FN(IFACEGEN),              // x IFACEGEN
    THOP_FN(IFACEGEN),              // x IFACEGENOWNER
    THOP_FN(IFACE),                 // x UNKOUTER
    Thop_ERROR_1632,                // x UNKINNER
    Thop_ERROR_1632,                // x ROUTINE_INDEX
    THOP_FN(RETURNTYPE),            // x RETURN_TYPE
    THOP_FN(NULL),                  // x NULL
    Thop_ERROR_1632,                // x ERROR
    THOP_FN(ENUM),                  // x ENUM
    THOP_FN(CALLBACK),              // x CALLBACK
    THOP_FN(RPCOLEMESSAGE),         // x RPCOLEMESSAGE
    THOP_FN(ALIAS32),               // x ALIAS32
    THOP_FN(CLSCONTEXT),            // x CLSCONTEXT
    THOP_FN(FILENAME),              // x FILENAME
    THOP_FN(SIZEDSTRING),           // x SIZEDSTRING
};

//+---------------------------------------------------------------------------
//
//  Function:   General_Enum_1632, private
//
//  Synopsis:   Thunking for standard OLE enumerator interface ::Next member
//              function.
//
//  Arguments:  [pti] - Thunk state information
//              [uiSize32] - 32-bit information size
//              [uiSize16] - 16-bit information size
//              [pfnCallback] - Data thunking callback
//              [pfnCleanup] - Thunking cleanup
//
//  Returns:    Appropriate status code
//
//  History:    1-Mar-94        BobDay  Created
//
//  Notes:      This handler is called from many IXXXEnum::Next handlers thop
//              thunks to do the standard sorts of "buffer of structures"
//              processing.
//
//----------------------------------------------------------------------------
#define MAX_ALLOCA_STRUCT   10

DWORD General_Enum_1632(
    THUNKINFO   *pti,
    UINT        uiSize32,
    UINT        uiSize16,
    SCODE       (*pfnCallback)( THUNKINFO *, LPVOID, VPVOID),
    void        (*pfnCleanup)( THUNKINFO *, LPVOID, VPVOID)   )
{
    DWORD       dwResult;
    ULONG       ulCount;
    VPVOID      vpstruct16;
    VPVOID      vpfetched16;
    LPVOID      lpstruct32;
    LPVOID      lpstruct32Iterate;
    VPVOID      vpstruct16Iterate;
    ULONG       ulFetched32;
    ULONG       *lpfetched32;
    ULONG UNALIGNED *lpfetched16;
    ULONG       ulIterate;
    LPVOID      lp16;
    BOOL        fError;
    SCODE       sc;

    dwResult = (DWORD)S_OK;

    GET_STACK16(pti, ulCount, ULONG );
    GET_STACK16(pti, vpstruct16, VPVOID );
    GET_STACK16(pti, vpfetched16, VPVOID );

    //
    // THIS ROUTINE CAN DEAL WITH dwResult RATHER THAN pti->scResult BECAUSE
    // WE KNOW THIS IS THE ONLY THOP FOR THIS FUNCTION!  NO OTHER CLEANUP
    // WILL HAVE TO BE DONE!
    //
    ulFetched32 = 0;
    lpfetched32 = &ulFetched32;
    lp16 = NULL;
    lpstruct32 = NULL;

    if ( vpstruct16 != 0 )
    {
        if ( ulCount == 0 )
        {
            dwResult = (DWORD)E_INVALIDARG;
        }
        else
        {
            //
            // Verify we have write access to the 16-bit memory.
            //
            lp16 = GetWritePtr16(pti, vpstruct16, uiSize16*ulCount);
            if ( lp16 == NULL )
            {
                dwResult = (DWORD)E_INVALIDARG;
            }
            else
            {
                if ( ulCount > MAX_ALLOCA_STRUCT )
                {
                    lpstruct32 = (LPVOID)CoTaskMemAlloc( ulCount * uiSize32 );
                    if (lpstruct32 == NULL)
                    {
                        dwResult = (DWORD)E_OUTOFMEMORY;
                    }
                }
                else
                {
                    lpstruct32 = (LPVOID)STACKALLOC32( ulCount * uiSize32 );
                    if (lpstruct32 == NULL)
                    {
                        dwResult = (DWORD)E_OUTOFMEMORY;
                    }
                }

                WOWRELVDMPTR(vpstruct16);
            }
        }
    }

    if (SUCCEEDED(dwResult))
    {
        TO_STACK32(pti, ulCount, ULONG);
        TO_STACK32(pti, lpstruct32, LPVOID);
        TO_STACK32(pti, lpfetched32, ULONG FAR *);

        pti->pThop++;
        dwResult = EXECUTE_THOP1632(pti);
    }

    if ( SUCCEEDED(dwResult) )
    {
        if ( vpstruct16 != 0 )
        {
            // Some apps (MsWorks3 is one) return S_FALSE and do not return
            // the number of elements retrieved.  The only thing we can
            // do is ignore the enumeration since we don't know how many
            // were actually set.  Of course, we can't ignore all enumerations
            // when the return is S_FALSE so we only handle the case
            // where S_FALSE was returned on a enumeration of one element,
            // in which we can be sure there isn't any valid data
            if (dwResult == (DWORD)S_FALSE && ulCount == 1)
            {
                ulFetched32 = 0;
            }

            //
            // Iterate through all of the structures, converting them
            // into 16-bit
            //
            fError = FALSE;
            ulIterate = 0;
            vpstruct16Iterate = vpstruct16;
            lpstruct32Iterate = lpstruct32;

            while ( ulIterate < ulFetched32 )
            {
                //
                // Callback to the callback function to do any specific
                // processing
                //
                sc = (*pfnCallback)( pti, lpstruct32Iterate,
                                     vpstruct16Iterate );

                if ( FAILED(sc) )
                {
                    fError = TRUE;
                    dwResult = sc;
                }

                vpstruct16Iterate = (VPVOID)((DWORD)vpstruct16Iterate +
                                             uiSize16);
                lpstruct32Iterate = (LPVOID)((DWORD)lpstruct32Iterate +
                                             uiSize32);

                ulIterate++;
            }

            if ( fError )
            {
                //
                // Cleanup all these guys
                //
                ulIterate = 0;
                vpstruct16Iterate = vpstruct16;
                lpstruct32Iterate = lpstruct32;

                while ( ulIterate <= ulFetched32 )
                {
                    (*pfnCleanup)( pti, lpstruct32Iterate, vpstruct16Iterate );
                    vpstruct16Iterate = (VPVOID)((DWORD)vpstruct16Iterate +
                                                 uiSize16);
                    lpstruct32Iterate = (LPVOID)((DWORD)lpstruct32Iterate +
                                                 uiSize32);

                    ulIterate++;
                }
            }
        }
    }

    if (FAILED(dwResult) && lp16 != NULL)
    {
        memset(lp16, 0, ulCount*uiSize16);
    }

    //
    // Free up any space we've allocated
    //
    if (lpstruct32 != NULL)
    {
        if ( ulCount > MAX_ALLOCA_STRUCT )
        {
            CoTaskMemFree( lpstruct32 );
        }
        else
        {
            STACKFREE32(lpstruct32, ulCount*uiSize32);
        }
    }

    if ( vpfetched16 != 0 )
    {
        lpfetched16 = FIXVDMPTR( vpfetched16, ULONG);
        *lpfetched16 = ulFetched32;
        RELVDMPTR(vpfetched16);
    }

    return dwResult;
}

//+---------------------------------------------------------------------------
//
//  Function:   Callback_STRING_1632, public
//
//  Synopsis:   Prepares the LPOLESTR for the copy back into 16-bit address
//              space.
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    SCODE indicating success/failure
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

SCODE Callback_STRING_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    VPSTR vpstr;
    VPSTR UNALIGNED *pvpstr16;
    SCODE sc;

    vpstr = 0;
    sc = ConvertTaskString3216(pti, *(LPOLESTR *)lp32, NULL, 0,
                               &vpstr);

    pvpstr16 = FIXVDMPTR(vp16, VPSTR);
    *pvpstr16 = vpstr;
    RELVDMPTR(vp16);

    return sc;
}

//+---------------------------------------------------------------------------
//
//  Function:   Cleanup_STRING_1632, public
//
//  Synopsis:   Cleans up the any STRINGs returned (either to 16-bit or 32-bit)
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    nothing, should NEVER fail
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

void Cleanup_STRING_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    VPSTR UNALIGNED *lpvpstr16;
    VPSTR           vpstr16;

    lpvpstr16 = FIXVDMPTR( vp16, VPSTR );
    vpstr16 = *lpvpstr16;
    RELVDMPTR(vp16);

    if ( vpstr16 != 0 )
    {
        TaskFree16( vpstr16 );
    }
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_Enum_STRING_1632, public
//
//  Synopsis:   Thunks IEnumSTRING::Next parameters
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    1-Mar-94        BobDay  Created
//
//  Notes:      This thunk is 2nd part of a 2-byte thop.
//
//----------------------------------------------------------------------------

DWORD Thop_Enum_STRING_1632(THUNKINFO *pti)
{
    return General_Enum_1632(pti,
                             sizeof(LPOLESTR),
                             sizeof(VPSTR),
                             Callback_STRING_1632,
                             Cleanup_STRING_1632 );
}

//+---------------------------------------------------------------------------
//
//  Function:   Callback_UNKNOWN_1632, public
//
//  Synopsis:   Prepares the UNKNOWN structure for the copy back into 16-bit
//              address space.
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    SCODE indicating success/failure
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

SCODE Callback_UNKNOWN_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    VPVOID          vpunknown16;
    SCODE           sc = S_OK;

    vpunknown16 =
        pti->pThkMgr->FindProxy1632(NULL, *(LPUNKNOWN *)lp32, NULL,
                                    INDEX_IIDIDX(THI_IUnknown), NULL);
    
    // Release the actual 32-bit IUnknown as it is a OUT parameter
    // This could be the last release on the interface if the
    // above call failed;
    (*((LPUNKNOWN *) lp32))->Release();
    
    if(!vpunknown16) {
        sc = E_OUTOFMEMORY;
    }

    *FIXVDMPTR( vp16, VPVOID ) = vpunknown16;
    RELVDMPTR(vp16);

    return sc;
}

//+---------------------------------------------------------------------------
//
//  Function:   Cleanup_UNKNOWN_1632, public
//
//  Synopsis:   Cleans up the any UNKNOWNs returned (either to 16-bit
//              or 32-bit)
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    nothing, should NEVER fail
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

void Cleanup_UNKNOWN_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    LPUNKNOWN        lpunknown32;
    VPVOID           vpunknown16;

    vpunknown16 = *FIXVDMPTR( vp16, VPVOID );
    RELVDMPTR(vp16);
    lpunknown32 = *(LPUNKNOWN *)lp32;

    if(vpunknown16) {
        // Release the proxy to 32-bit interface
        pti->pThkMgr->ReleaseProxy1632(vpunknown16);
    }
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_Enum_UNKNOWN_1632, public
//
//  Synopsis:   Thunks IEnumUNKNOWN::Next parameters
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    1-Mar-94        BobDay  Created
//
//  Notes:      This thunk is 2nd part of a 2-byte thop.
//
//----------------------------------------------------------------------------

DWORD Thop_Enum_UNKNOWN_1632(THUNKINFO *pti)
{
    return General_Enum_1632(pti,
                             sizeof(LPUNKNOWN),
                             sizeof(LPUNKNOWN),
                             Callback_UNKNOWN_1632,
                             Cleanup_UNKNOWN_1632 );
}

//+---------------------------------------------------------------------------
//
//  Function:   Callback_STATSTG_1632, public
//
//  Synopsis:   Prepares the STATSTG structure for the copy back into 16-bit
//              address space.
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    SCODE indicating success/failure
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

SCODE Callback_STATSTG_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    (FIXVDMPTR(vp16, STATSTG))->pwcsName = NULL;
    RELVDMPTR(vp16);
    return ConvertStatStg3216(pti, (STATSTG *)lp32, vp16,
                              NULL, 0);
}

//+---------------------------------------------------------------------------
//
//  Function:   Cleanup_STATSTG_1632, public
//
//  Synopsis:   Cleans up the any STATSTGs returned (either to 16-bit
//              or 32-bit)
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    nothing, should NEVER fail
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

void Cleanup_STATSTG_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    STATSTG UNALIGNED *lpstatstg16;
    VPVOID vpstr;

    lpstatstg16 = FIXVDMPTR( vp16, STATSTG );
    vpstr = (VPVOID)lpstatstg16->pwcsName;
    RELVDMPTR(vp16);

    if ( vpstr != 0)
    {
        TaskFree16( vpstr );
    }
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_Enum_STATSTG_1632, public
//
//  Synopsis:   Thunks IEnumSTATSTG::Next parameters
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    1-Mar-94        BobDay  Created
//
//  Notes:      This thunk is 2nd part of a 2-byte thop.
//
//----------------------------------------------------------------------------

DWORD Thop_Enum_STATSTG_1632(THUNKINFO *pti)
{
    return General_Enum_1632(pti,
                             sizeof(STATSTG),
                             sizeof(STATSTG),
                             Callback_STATSTG_1632,
                             Cleanup_STATSTG_1632 );
}

//+---------------------------------------------------------------------------
//
//  Function:   Callback_FORMATETC_1632, public
//
//  Synopsis:   Prepares the FORMATETC structure for the copy back into 16-bit
//              address space.
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    SCODE indicating success/failure
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

SCODE Callback_FORMATETC_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    (FIXVDMPTR(vp16, FORMATETC16))->ptd = NULL;
    RELVDMPTR(vp16);
    return ConvertFetc3216(pti, (FORMATETC *)lp32, vp16, TRUE);
}

//+---------------------------------------------------------------------------
//
//  Function:   Cleanup_FORMATETC_1632, public
//
//  Synopsis:   Cleans up the any FORMATETCs returned (either to 16-bit
//              or 32-bit)
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    nothing, should NEVER fail
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

void Cleanup_FORMATETC_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    FORMATETC16 UNALIGNED *lpformatetc16;
    VPVOID vptd;

    lpformatetc16 = FIXVDMPTR( vp16, FORMATETC16 );
    vptd = lpformatetc16->ptd;
    RELVDMPTR(vp16);

    if (vptd != 0)
    {
        TaskFree16(vptd);
    }
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_Enum_FORMATETC_1632, public
//
//  Synopsis:   Thunks IEnumFORMATETC::Next parameters
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    1-Mar-94        BobDay  Created
//
//  Notes:      This thunk is 2nd part of a 2-byte thop.
//
//----------------------------------------------------------------------------

DWORD Thop_Enum_FORMATETC_1632(THUNKINFO *pti)
{
    return General_Enum_1632(pti,
                             sizeof(FORMATETC),
                             sizeof(FORMATETC16),
                             Callback_FORMATETC_1632,
                             Cleanup_FORMATETC_1632 );
}

//+---------------------------------------------------------------------------
//
//  Function:   Callback_STATDATA_1632, public
//
//  Synopsis:   Prepares the STATDATA structure for the copy back into 16-bit
//              address space.
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    SCODE indicating success/failure
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------
SCODE Callback_STATDATA_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    SCODE               sc;
    LPSTATDATA          lpstatdata32;
    STATDATA16 UNALIGNED *lpstatdata16;
    VPVOID              vpadv16;

    sc = S_OK;

    lpstatdata32 = (LPSTATDATA)lp32;

    if (lpstatdata32->pAdvSink != NULL)
    {
        // We don't know whether it's an AdviseSink or
        // an AdviseSink2, so pass AdviseSink2 since it's
        // a superset of AdviseSink and will work for both

        vpadv16 = pti->pThkMgr->FindProxy1632(NULL, lpstatdata32->pAdvSink, NULL,
                                              INDEX_IIDIDX(THI_IAdviseSink2),
                                              NULL);

        // Release the actual 32-bit IAdviseSink as it is a OUT parameter
        // This could be the last release on the interface if the
        // above call failed;
        lpstatdata32->pAdvSink->Release();

        if(!vpadv16) {
            sc = E_OUTOFMEMORY;
        }
    }
    else
    {
        vpadv16 = 0;
    }

    lpstatdata16 = FIXVDMPTR( vp16, STATDATA16 );
    lpstatdata16->formatetc.ptd = NULL;
    if (SUCCEEDED(sc))
    {
        // If this fails the AdviseSink proxy will be cleaned up in
        // the cleanup function later

        sc = ConvertFetc3216(pti,
                             &lpstatdata32->formatetc,
                             vp16+FIELD_OFFSET(STATDATA16, formatetc), TRUE);
    }

    if (SUCCEEDED(sc))
    {
        lpstatdata16->advf = lpstatdata32->advf;
        lpstatdata16->pAdvSink = vpadv16;
        lpstatdata16->dwConnection = lpstatdata32->dwConnection;
    }

    RELVDMPTR(vp16);

    return sc;
}

//+---------------------------------------------------------------------------
//
//  Function:   Cleanup_STATDATA_1632, public
//
//  Synopsis:   Cleans up the any STATDATAs returned (either to 16-bit
//              or 32-bit)
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    nothing, should NEVER fail
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

void Cleanup_STATDATA_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    STATDATA *lpstatdata32;
    STATDATA16 UNALIGNED *lpstatdata16;
    LPADVISESINK lpadv32;
    VPVOID vptd;

    lpstatdata32 = (STATDATA FAR *)lp32;
    lpadv32 = lpstatdata32->pAdvSink;

    lpstatdata16 = FIXVDMPTR( vp16, STATDATA16 );
    vptd = lpstatdata16->formatetc.ptd;
    RELVDMPTR(vp16);

    if(lpstatdata16->pAdvSink) {
        // Release the proxy to 32-bit interface
        pti->pThkMgr->ReleaseProxy1632((VPVOID) lpstatdata32->pAdvSink);
    }

    if (vptd != 0)
    {
        TaskFree16(vptd);
    }
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_Enum_STATDATA_1632, public
//
//  Synopsis:   Thunks IEnumSTATDATA::Next parameters
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    1-Mar-94        BobDay  Created
//
//  Notes:      This thunk is 2nd part of a 2-byte thop.
//
//----------------------------------------------------------------------------

DWORD Thop_Enum_STATDATA_1632(THUNKINFO *pti)
{
    return General_Enum_1632(pti,
                             sizeof(STATDATA),
                             sizeof(STATDATA16),
                             Callback_STATDATA_1632,
                             Cleanup_STATDATA_1632 );
}

//+---------------------------------------------------------------------------
//
//  Function:   Callback_MONIKER_1632, public
//
//  Synopsis:   Prepares the MONIKER structure for the copy back into 16-bit
//              address space.
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    SCODE indicating success/failure
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

SCODE Callback_MONIKER_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    VPVOID        vpmoniker16;
    SCODE         sc = S_OK;

    vpmoniker16 = pti->pThkMgr->FindProxy1632(NULL, *(LPMONIKER *)lp32, NULL,
                                              INDEX_IIDIDX(THI_IMoniker),
                                              NULL);
    
    // Release the actual 32-bit IMoniker as it is a OUT parameter
    // This could be the last release on the interface if the
    // above call failed;
    (*(LPMONIKER *)lp32)->Release();

    if(!vpmoniker16) {
        sc = E_OUTOFMEMORY;
    }

    *FIXVDMPTR(vp16, VPVOID) = vpmoniker16;
    RELVDMPTR(vp16);

    return sc;
}

//+---------------------------------------------------------------------------
//
//  Function:   Cleanup_MONIKER_1632, public
//
//  Synopsis:   Cleans up the any MONIKERs returned (either to 16-bit
//              or 32-bit)
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    nothing, should NEVER fail
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

void Cleanup_MONIKER_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    LPMONIKER       lpmoniker32;
    VPVOID          vpmoniker16;

    vpmoniker16 = *FIXVDMPTR( vp16, VPVOID );
    RELVDMPTR(vp16);
    lpmoniker32 = *(LPMONIKER *)lp32;

    if(vpmoniker16) {
        pti->pThkMgr->ReleaseProxy1632(vpmoniker16);
    }
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_Enum_MONIKER_1632, public
//
//  Synopsis:   Thunks IEnumMONIKER::Next parameters
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    1-Mar-94        BobDay  Created
//
//  Notes:      This thunk is 2nd part of a 2-byte thop.
//
//----------------------------------------------------------------------------

DWORD Thop_Enum_MONIKER_1632(THUNKINFO *pti)
{
    return General_Enum_1632(pti,
                             sizeof(LPMONIKER),
                             sizeof(LPMONIKER),
                             Callback_MONIKER_1632,
                             Cleanup_MONIKER_1632 );
}

//+---------------------------------------------------------------------------
//
//  Function:   Callback_OLEVERB_1632, public
//
//  Synopsis:   Prepares the OLEVERB structure for the copy back into 16-bit
//              address space.
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    SCODE indicating success/failure
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

SCODE Callback_OLEVERB_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    SCODE       sc;
    OLEVERB     *lpoleverb32;
    OLEVERB UNALIGNED *lpoleverb16;
    VPSTR vpstr;

    lpoleverb32 = (LPOLEVERB)lp32;
    vpstr = 0;
    sc = ConvertTaskString3216(pti, lpoleverb32->lpszVerbName, NULL, 0,
                               &vpstr);
    lpoleverb16 = FIXVDMPTR(vp16, OLEVERB);
    lpoleverb16->lpszVerbName = (LPOLESTR)vpstr;
    if (SUCCEEDED(sc))
    {
        lpoleverb16->lVerb        = lpoleverb32->lVerb;
        lpoleverb16->fuFlags      = lpoleverb32->fuFlags;
        lpoleverb16->grfAttribs   = lpoleverb32->grfAttribs;
    }
    RELVDMPTR(vp16);

    return sc;
}

//+---------------------------------------------------------------------------
//
//  Function:   Cleanup_OLEVERB_1632, public
//
//  Synopsis:   Cleans up the any OLEVERBs returned (either to 16-bit
//              or 32-bit)
//
//  Arguments:  [pti] - Thunking state information
//              [lp32] - Pointer to 32-bit returned structure
//              [lp16] - Pointer to 16-bit output structure
//
//  Returns:    nothing, should NEVER fail
//
//  History:    1-Mar-94        BobDay  Created
//
//----------------------------------------------------------------------------

void Cleanup_OLEVERB_1632( THUNKINFO *pti, LPVOID lp32, VPVOID vp16 )
{
    OLEVERB UNALIGNED *lpoleverb16;
    VPVOID vpstr;

    lpoleverb16 = FIXVDMPTR( vp16, OLEVERB );
    vpstr = (VPVOID)lpoleverb16->lpszVerbName;
    RELVDMPTR(vp16);

    if ( vpstr != 0 )
    {
        TaskFree16( vpstr );
    }
}

//+---------------------------------------------------------------------------
//
//  Function:   Thop_Enum_OLEVERB_1632, public
//
//  Synopsis:   Thunks IEnumOLEVERB::Next parameters
//
//  Arguments:  [pti] - Thunk state information
//
//  Returns:    Appropriate status code
//
//  History:    1-Mar-94        BobDay  Created
//
//  Notes:      This thunk is 2nd part of a 2-byte thop.
//
//----------------------------------------------------------------------------

DWORD Thop_Enum_OLEVERB_1632(THUNKINFO *pti)
{
    return General_Enum_1632(pti,
                             sizeof(OLEVERB),
                             sizeof(OLEVERB),
                             Callback_OLEVERB_1632,
                             Cleanup_OLEVERB_1632 );
}

#define THOP_EFN(x)  Thop_Enum_ ## x ## _1632

DWORD (*CONST aThopEnumFunctions1632[])(THUNKINFO *) =
{
    THOP_EFN(STRING),               // STRING
    THOP_EFN(UNKNOWN),              // UNKNOWN
    THOP_EFN(STATSTG),              // STATSTG
    THOP_EFN(FORMATETC),            // FORMATETC
    THOP_EFN(STATDATA),             // STATDATA
    THOP_EFN(MONIKER),              // MONIKER
    THOP_EFN(OLEVERB),              // OLEVERB
};