wine/dlls/ole32/clipboard.c

/*
 *  OLE 2 clipboard support
 *
 *      Copyright 1999  Noel Borthwick <noel@macadamian.com>
 *      Copyright 2000  Abey George <abey@macadamian.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * NOTES:
 *    This file contains the implementation for the OLE Clipboard and its
 *    internal interfaces. The OLE clipboard interacts with an IDataObject
 *    interface via the OleSetClipboard, OleGetClipboard and
 *    OleIsCurrentClipboard API's. An internal IDataObject delegates
 *    to a client supplied IDataObject or the WIN32 clipboard API depending
 *    on whether OleSetClipboard has been invoked.
 *    Here are some operating scenarios:
 *
 *    1. OleSetClipboard called: In this case the internal IDataObject
 *       delegates to the client supplied IDataObject. Additionally OLE takes
 *       ownership of the Windows clipboard and any HGLOCBAL IDataObject
 *       items are placed on the Windows clipboard. This allows non OLE aware
 *       applications to access these. A local WinProc fields WM_RENDERFORMAT
 *       and WM_RENDERALLFORMATS messages in this case.
 *
 *    2. OleGetClipboard called without previous OleSetClipboard. Here the internal
 *       IDataObject functionality wraps around the WIN32 clipboard API.
 *
 *    3. OleGetClipboard called after previous OleSetClipboard. Here the internal
 *       IDataObject delegates to the source IDataObjects functionality directly,
 *       thereby bypassing the Windows clipboard.
 *
 *    Implementation references : Inside OLE 2'nd  edition by Kraig Brockschmidt
 *
 * TODO:
 *    - Support for pasting between different processes. OLE clipboard support
 *      currently works only for in process copy and paste. Since we internally
 *      store a pointer to the source's IDataObject and delegate to that, this
 *      will fail if the IDataObject client belongs to a different process.
 *    - IDataObject::GetDataHere is not implemented
 *    - OleFlushClipboard needs to additionally handle TYMED_IStorage media
 *      by copying the storage into global memory. Subsequently the default
 *      data object exposed through OleGetClipboard must convert this TYMED_HGLOBAL
 *      back to TYMED_IStorage.
 *    - OLE1 compatibility formats to be synthesized from OLE2 formats and put on
 *      clipboard in OleSetClipboard.
 *
 */

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

#define COBJMACROS
#define NONAMELESSUNION
#define NONAMELESSSTRUCT

#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "winerror.h"
#include "winnls.h"
#include "ole2.h"
#include "wine/debug.h"
#include "olestd.h"

#include "storage32.h"

#include "compobj_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(ole);

#define HANDLE_ERROR(err) do { hr = err; TRACE("(HRESULT=%x)\n", (HRESULT)err); goto CLEANUP; } while (0)

/* Structure of 'Ole Private Data' clipboard format */
typedef struct
{
    FORMATETC fmtetc;
    DWORD first_use;  /* Has this cf been added to the list already */
    DWORD unk[2];
} ole_priv_data_entry;

typedef struct
{
    DWORD unk1;
    DWORD size; /* in bytes of the entire structure */
    DWORD unk2;
    DWORD count; /* no. of format entries */
    DWORD unk3[2];
    ole_priv_data_entry entries[1]; /* array of size count */
    /* then follows any DVTARGETDEVICE structures referenced in the FORMATETCs */
} ole_priv_data;

/*****************************************************************************
 *           create_empty_priv_data
 *
 * Create an empty data structure.  The only thing that really matters
 * here is setting count and size members.  This is used by the enumerator as a
 * convenience when there's an empty list.
 */
static HRESULT create_empty_priv_data(ole_priv_data **data)
{
    ole_priv_data *ptr;

    *data = NULL;
    ptr = HeapAlloc(GetProcessHeap(), 0, sizeof(*ptr));
    if(!ptr) return E_OUTOFMEMORY;
    ptr->size = sizeof(*ptr);
    ptr->count = 0;
    *data = ptr;
    return S_OK;
}


/****************************************************************************
 * ole_clipbrd
 */
typedef struct ole_clipbrd
{
    const IDataObjectVtbl* lpvtbl;  /* Exposed IDataObject vtable */

    LONG ref;

    HWND hWndClipboard;              /* Hidden clipboard window */
    IDataObject *pIDataObjectSrc;    /* Source object passed to OleSetClipboard */
    ole_priv_data *cached_enum;      /* Cached result from the enumeration of src data object */
} ole_clipbrd;

static inline ole_clipbrd *impl_from_IDataObject(IDataObject *iface)
{
    return (ole_clipbrd*)((char*)iface - FIELD_OFFSET(ole_clipbrd, lpvtbl));
}

typedef struct PresentationDataHeader
{
  BYTE unknown1[28];
  DWORD dwObjectExtentX;
  DWORD dwObjectExtentY;
  DWORD dwSize;
} PresentationDataHeader;

/*
 * The one and only ole_clipbrd object which is created by OLEClipbrd_Initialize()
 */
static ole_clipbrd* theOleClipboard;


/*
 * Name of our registered OLE clipboard window class
 */
static const CHAR OLEClipbrd_WNDCLASS[] = "CLIPBRDWNDCLASS";

static UINT dataobject_clipboard_format;
static UINT ole_priv_data_clipboard_format;
static UINT embed_source_clipboard_format;

static inline char *dump_fmtetc(FORMATETC *fmt)
{
    static char buf[100];

    snprintf(buf, sizeof(buf), "cf %04x ptd %p aspect %x lindex %d tymed %x",
             fmt->cfFormat, fmt->ptd, fmt->dwAspect, fmt->lindex, fmt->tymed);
    return buf;
}

/*---------------------------------------------------------------------*
 *  Implementation of the internal IEnumFORMATETC interface returned by
 *  the OLE clipboard's IDataObject.
 *---------------------------------------------------------------------*/

typedef struct enum_fmtetc
{
    const IEnumFORMATETCVtbl *lpVtbl;
    LONG ref;

    UINT pos;    /* current enumerator position */
    ole_priv_data *data;
} enum_fmtetc;

static inline enum_fmtetc *impl_from_IEnumFORMATETC(IEnumFORMATETC *iface)
{
    return (enum_fmtetc*)((char*)iface - FIELD_OFFSET(enum_fmtetc, lpVtbl));
}

/************************************************************************
 * OLEClipbrd_IEnumFORMATETC_QueryInterface (IUnknown)
 *
 * See Windows documentation for more details on IUnknown methods.
 */
static HRESULT WINAPI OLEClipbrd_IEnumFORMATETC_QueryInterface
  (LPENUMFORMATETC iface, REFIID riid, LPVOID* ppvObj)
{
  enum_fmtetc *This = impl_from_IEnumFORMATETC(iface);

  TRACE("(%p)->(IID: %s, %p)\n", This, debugstr_guid(riid), ppvObj);

  *ppvObj = NULL;

  if(IsEqualIID(riid, &IID_IUnknown) ||
     IsEqualIID(riid, &IID_IEnumFORMATETC))
  {
    *ppvObj = iface;
  }

  if(*ppvObj)
  {
    IEnumFORMATETC_AddRef((IEnumFORMATETC*)*ppvObj);
    TRACE("-- Interface: (%p)->(%p)\n",ppvObj,*ppvObj);
    return S_OK;
  }

  TRACE("-- Interface: E_NOINTERFACE\n");
  return E_NOINTERFACE;
}

/************************************************************************
 * OLEClipbrd_IEnumFORMATETC_AddRef (IUnknown)
 *
 */
static ULONG WINAPI OLEClipbrd_IEnumFORMATETC_AddRef(LPENUMFORMATETC iface)
{
  enum_fmtetc *This = impl_from_IEnumFORMATETC(iface);
  TRACE("(%p)->(count=%u)\n",This, This->ref);

  return InterlockedIncrement(&This->ref);
}

/************************************************************************
 * OLEClipbrd_IEnumFORMATETC_Release (IUnknown)
 *
 * See Windows documentation for more details on IUnknown methods.
 */
static ULONG WINAPI OLEClipbrd_IEnumFORMATETC_Release(LPENUMFORMATETC iface)
{
  enum_fmtetc *This = impl_from_IEnumFORMATETC(iface);
  ULONG ref;

  TRACE("(%p)->(count=%u)\n",This, This->ref);

  ref = InterlockedDecrement(&This->ref);
  if (!ref)
  {
    TRACE("() - destroying IEnumFORMATETC(%p)\n",This);
    HeapFree(GetProcessHeap(), 0, This->data);
    HeapFree(GetProcessHeap(), 0, This);
  }
  return ref;
}

/************************************************************************
 * OLEClipbrd_IEnumFORMATETC_Next (IEnumFORMATETC)
 *
 * Standard enumerator members for IEnumFORMATETC
 */
static HRESULT WINAPI OLEClipbrd_IEnumFORMATETC_Next
  (LPENUMFORMATETC iface, ULONG celt, FORMATETC *rgelt, ULONG *pceltFethed)
{
  enum_fmtetc *This = impl_from_IEnumFORMATETC(iface);
  UINT cfetch, i;
  HRESULT hres = S_FALSE;

  TRACE("(%p)->(pos=%u)\n", This, This->pos);

  if (This->pos < This->data->count)
  {
    cfetch = This->data->count - This->pos;
    if (cfetch >= celt)
    {
      cfetch = celt;
      hres = S_OK;
    }

    for(i = 0; i < cfetch; i++)
    {
      rgelt[i] = This->data->entries[This->pos++].fmtetc;
      if(rgelt[i].ptd)
      {
        DVTARGETDEVICE *target = (DVTARGETDEVICE *)((char *)This->data + (DWORD)rgelt[i].ptd);
        rgelt[i].ptd = CoTaskMemAlloc(target->tdSize);
        if(!rgelt[i].ptd) return E_OUTOFMEMORY;
        memcpy(rgelt[i].ptd, target, target->tdSize);
      }
    }
  }
  else
  {
    cfetch = 0;
  }

  if (pceltFethed)
  {
    *pceltFethed = cfetch;
  }

  return hres;
}

/************************************************************************
 * OLEClipbrd_IEnumFORMATETC_Skip (IEnumFORMATETC)
 *
 * Standard enumerator members for IEnumFORMATETC
 */
static HRESULT WINAPI OLEClipbrd_IEnumFORMATETC_Skip(LPENUMFORMATETC iface, ULONG celt)
{
  enum_fmtetc *This = impl_from_IEnumFORMATETC(iface);
  TRACE("(%p)->(num=%u)\n", This, celt);

  This->pos += celt;
  if (This->pos > This->data->count)
  {
    This->pos = This->data->count;
    return S_FALSE;
  }
  return S_OK;
}

/************************************************************************
 * OLEClipbrd_IEnumFORMATETC_Reset (IEnumFORMATETC)
 *
 * Standard enumerator members for IEnumFORMATETC
 */
static HRESULT WINAPI OLEClipbrd_IEnumFORMATETC_Reset(LPENUMFORMATETC iface)
{
  enum_fmtetc *This = impl_from_IEnumFORMATETC(iface);
  TRACE("(%p)->()\n", This);

  This->pos = 0;
  return S_OK;
}

static HRESULT enum_fmtetc_construct(ole_priv_data *data, UINT pos, IEnumFORMATETC **obj);

/************************************************************************
 * OLEClipbrd_IEnumFORMATETC_Clone (IEnumFORMATETC)
 *
 * Standard enumerator members for IEnumFORMATETC
 */
static HRESULT WINAPI OLEClipbrd_IEnumFORMATETC_Clone
  (LPENUMFORMATETC iface, LPENUMFORMATETC* obj)
{
  enum_fmtetc *This = impl_from_IEnumFORMATETC(iface);
  ole_priv_data *new_data;

  TRACE("(%p)->(%p)\n", This, obj);

  if ( !obj ) return E_INVALIDARG;
  *obj = NULL;

  new_data = HeapAlloc(GetProcessHeap(), 0, This->data->size);
  if(!new_data) return E_OUTOFMEMORY;

  return enum_fmtetc_construct(new_data, This->pos, obj);
}

static const IEnumFORMATETCVtbl efvt =
{
  OLEClipbrd_IEnumFORMATETC_QueryInterface,
  OLEClipbrd_IEnumFORMATETC_AddRef,
  OLEClipbrd_IEnumFORMATETC_Release,
  OLEClipbrd_IEnumFORMATETC_Next,
  OLEClipbrd_IEnumFORMATETC_Skip,
  OLEClipbrd_IEnumFORMATETC_Reset,
  OLEClipbrd_IEnumFORMATETC_Clone
};

/************************************************************************
 * enum_fmtetc_construct
 *
 * Creates an IEnumFORMATETC enumerator from ole_priv_data which it then owns.
 */
static HRESULT enum_fmtetc_construct(ole_priv_data *data, UINT pos, IEnumFORMATETC **obj)
{
  enum_fmtetc* ef;

  *obj = NULL;
  ef = HeapAlloc(GetProcessHeap(), 0, sizeof(*ef));
  if (!ef) return E_OUTOFMEMORY;

  ef->ref = 1;
  ef->lpVtbl = &efvt;
  ef->data = data;
  ef->pos = pos;

  TRACE("(%p)->()\n", ef);
  *obj = (IEnumFORMATETC *)ef;
  return S_OK;
}

/***********************************************************************
 *                    dup_global_mem
 *
 * Helper method to duplicate an HGLOBAL chunk of memory
 */
static HRESULT dup_global_mem( HGLOBAL src, HGLOBAL *dst )
{
    void *src_ptr, *dst_ptr;
    DWORD size;

    *dst = NULL;
    if ( !src ) return S_FALSE;

    size = GlobalSize(src);

    *dst = GlobalAlloc( GMEM_DDESHARE|GMEM_MOVEABLE, size );
    if ( !*dst ) return E_OUTOFMEMORY;

    src_ptr = GlobalLock(src);
    dst_ptr = GlobalLock(*dst);

    memcpy(dst_ptr, src_ptr, size);

    GlobalUnlock(*dst);
    GlobalUnlock(src);

    return S_OK;
}

/************************************************************
 *              render_embed_source_hack
 *
 * This is clearly a hack and has no place in the clipboard code.
 *
 */
static HRESULT render_embed_source_hack(IDataObject *data, LPFORMATETC fmt)
{
    STGMEDIUM std;
    HGLOBAL hStorage = 0;
    HRESULT hr = S_OK;
    ILockBytes *ptrILockBytes;

    memset(&std, 0, sizeof(STGMEDIUM));
    std.tymed = fmt->tymed = TYMED_ISTORAGE;

    hStorage = GlobalAlloc(GMEM_SHARE|GMEM_MOVEABLE, 0);
    if (hStorage == NULL) return E_OUTOFMEMORY;
    hr = CreateILockBytesOnHGlobal(hStorage, FALSE, &ptrILockBytes);
    hr = StgCreateDocfileOnILockBytes(ptrILockBytes, STGM_SHARE_EXCLUSIVE|STGM_READWRITE, 0, &std.u.pstg);
    ILockBytes_Release(ptrILockBytes);

    if (FAILED(hr = IDataObject_GetDataHere(theOleClipboard->pIDataObjectSrc, fmt, &std)))
    {
        WARN("() : IDataObject_GetDataHere failed to render clipboard data! (%x)\n", hr);
        GlobalFree(hStorage);
        return hr;
    }

    if (1) /* check whether the presentation data is already -not- present */
    {
        FORMATETC fmt2;
        STGMEDIUM std2;
        METAFILEPICT *mfp = 0;

        fmt2.cfFormat = CF_METAFILEPICT;
        fmt2.ptd = 0;
        fmt2.dwAspect = DVASPECT_CONTENT;
        fmt2.lindex = -1;
        fmt2.tymed = TYMED_MFPICT;

        memset(&std2, 0, sizeof(STGMEDIUM));
        std2.tymed = TYMED_MFPICT;

        /* Get the metafile picture out of it */

        if (SUCCEEDED(hr = IDataObject_GetData(theOleClipboard->pIDataObjectSrc, &fmt2, &std2)))
        {
            mfp = GlobalLock(std2.u.hGlobal);
        }

        if (mfp)
        {
            OLECHAR name[]={ 2, 'O', 'l', 'e', 'P', 'r', 'e', 's', '0', '0', '0', 0};
            IStream *pStream = 0;
            void *mfBits;
            PresentationDataHeader pdh;
            INT nSize;
            CLSID clsID;
            LPOLESTR strProgID;
            CHAR strOleTypeName[51];
            BYTE OlePresStreamHeader [] =
            {
                0xFF, 0xFF, 0xFF, 0xFF, 0x03, 0x00, 0x00, 0x00,
                0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
                0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00
            };

            nSize = GetMetaFileBitsEx(mfp->hMF, 0, NULL);

            memset(&pdh, 0, sizeof(PresentationDataHeader));
            memcpy(&pdh, OlePresStreamHeader, sizeof(OlePresStreamHeader));

            pdh.dwObjectExtentX = mfp->xExt;
            pdh.dwObjectExtentY = mfp->yExt;
            pdh.dwSize = nSize;

            hr = IStorage_CreateStream(std.u.pstg, name, STGM_CREATE|STGM_SHARE_EXCLUSIVE|STGM_READWRITE, 0, 0, &pStream);

            hr = IStream_Write(pStream, &pdh, sizeof(PresentationDataHeader), NULL);

            mfBits = HeapAlloc(GetProcessHeap(), 0, nSize);
            nSize = GetMetaFileBitsEx(mfp->hMF, nSize, mfBits);

            hr = IStream_Write(pStream, mfBits, nSize, NULL);

            IStream_Release(pStream);

            HeapFree(GetProcessHeap(), 0, mfBits);

            GlobalUnlock(std2.u.hGlobal);
            ReleaseStgMedium(&std2);

            ReadClassStg(std.u.pstg, &clsID);
            ProgIDFromCLSID(&clsID, &strProgID);

            WideCharToMultiByte( CP_ACP, 0, strProgID, -1, strOleTypeName, sizeof(strOleTypeName), NULL, NULL );
            OLECONVERT_CreateOleStream(std.u.pstg);
            OLECONVERT_CreateCompObjStream(std.u.pstg, strOleTypeName);
        }
    }

    if ( !SetClipboardData( fmt->cfFormat, hStorage ) )
    {
        WARN("() : Failed to set rendered clipboard data into clipboard!\n");
        GlobalFree(hStorage);
        hr = CLIPBRD_E_CANT_SET;
    }

    ReleaseStgMedium(&std);
    return hr;
}

/************************************************************************
 *           find_format_in_list
 *
 * Returns the first entry that matches the provided clipboard format.
 */
static inline ole_priv_data_entry *find_format_in_list(ole_priv_data_entry *entries, DWORD num, UINT cf)
{
    DWORD i;
    for(i = 0; i < num; i++)
        if(entries[i].fmtetc.cfFormat == cf)
            return &entries[i];

    return NULL;
}

/***************************************************************************
 *         get_data_from_stream
 *
 * Returns stream data in an HGLOBAL.
 */
static HRESULT get_data_from_stream(IDataObject *data, FORMATETC *fmt, HGLOBAL *mem)
{
    HGLOBAL h;
    IStream *stm = NULL;
    HRESULT hr;
    FORMATETC stm_fmt;
    STGMEDIUM med;

    *mem = NULL;

    h = GlobalAlloc( GMEM_DDESHARE|GMEM_MOVEABLE, 0 );
    if(!h) return E_OUTOFMEMORY;

    hr = CreateStreamOnHGlobal(h, FALSE, &stm);
    if(FAILED(hr)) goto error;

    stm_fmt = *fmt;
    med.tymed = stm_fmt.tymed = TYMED_ISTREAM;
    med.u.pstm = stm;
    med.pUnkForRelease = NULL;

    hr = IDataObject_GetDataHere(data, &stm_fmt, &med);
    if(FAILED(hr))
    {
        LARGE_INTEGER offs;
        ULARGE_INTEGER pos;

        med.u.pstm = NULL;
        hr = IDataObject_GetData(data, &stm_fmt, &med);
        if(FAILED(hr)) goto error;

        offs.QuadPart = 0;
        IStream_Seek(med.u.pstm, offs, STREAM_SEEK_CUR, &pos);
        IStream_Seek(med.u.pstm, offs, STREAM_SEEK_SET, NULL);
        hr = IStream_CopyTo(med.u.pstm, stm, pos, NULL, NULL);
        ReleaseStgMedium(&med);
        if(FAILED(hr)) goto error;
    }
    *mem = h;
    IStream_Release(stm);
    return S_OK;

error:
    if(stm) IStream_Release(stm);
    GlobalFree(h);
    return hr;
}

/***************************************************************************
 *         get_data_from_global
 *
 * Returns global data in an HGLOBAL.
 */
static HRESULT get_data_from_global(IDataObject *data, FORMATETC *fmt, HGLOBAL *mem)
{
    HGLOBAL h;
    HRESULT hr;
    FORMATETC mem_fmt;
    STGMEDIUM med;

    *mem = NULL;

    mem_fmt = *fmt;
    mem_fmt.tymed = TYMED_HGLOBAL;

    hr = IDataObject_GetData(data, &mem_fmt, &med);
    if(FAILED(hr)) return hr;

    hr = dup_global_mem(med.u.hGlobal, &h);

    if(SUCCEEDED(hr)) *mem = h;

    ReleaseStgMedium(&med);

    return hr;
}

/***********************************************************************
 *                render_format
 *
 * Render the clipboard data. Note that this call will delegate to the
 * source data object.
 */
static HRESULT render_format(IDataObject *data, LPFORMATETC fmt)
{
    HGLOBAL clip_data = NULL;
    HRESULT hr;

    /* Embed source hack */
    if(fmt->cfFormat == embed_source_clipboard_format)
    {
        return render_embed_source_hack(data, fmt);
    }

    if(fmt->tymed & TYMED_ISTREAM)
    {
        hr = get_data_from_stream(data, fmt, &clip_data);
    }
    else if(fmt->tymed & TYMED_HGLOBAL)
    {
        hr = get_data_from_global(data, fmt, &clip_data);
    }
    else
    {
        FIXME("Unhandled tymed %x\n", fmt->tymed);
        hr = DV_E_FORMATETC;
    }

    if(SUCCEEDED(hr))
    {
        if ( !SetClipboardData(fmt->cfFormat, clip_data) )
        {
            WARN("() : Failed to set rendered clipboard data into clipboard!\n");
            GlobalFree(clip_data);
            hr = CLIPBRD_E_CANT_SET;
        }
    }

    return hr;
}

/***********************************************************************
 *                   clipbrd_wndproc
 */
static LRESULT CALLBACK clipbrd_wndproc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
    ole_clipbrd *clipbrd = theOleClipboard;

    switch (message)
    {
    case WM_RENDERFORMAT:
    {
        UINT cf = wparam;
        ole_priv_data_entry *entry;

        TRACE("(): WM_RENDERFORMAT(cfFormat=%x)\n", cf);
        entry = find_format_in_list(clipbrd->cached_enum->entries, clipbrd->cached_enum->count, cf);

        if(entry)
            render_format(clipbrd->pIDataObjectSrc, &entry->fmtetc);

        break;
    }

    case WM_RENDERALLFORMATS:
    {
        DWORD i;
        ole_priv_data_entry *entries = clipbrd->cached_enum->entries;

        TRACE("(): WM_RENDERALLFORMATS\n");

        for(i = 0; i < clipbrd->cached_enum->count; i++)
        {
            if(entries[i].first_use)
                render_format(clipbrd->pIDataObjectSrc, &entries[i].fmtetc);
        }
        break;
    }

    case WM_DESTROYCLIPBOARD:
    {
        TRACE("(): WM_DESTROYCLIPBOARD\n");

        if ( clipbrd->pIDataObjectSrc )
        {
            IDataObject_Release(clipbrd->pIDataObjectSrc);
            clipbrd->pIDataObjectSrc = NULL;
            HeapFree(GetProcessHeap(), 0, clipbrd->cached_enum);
            clipbrd->cached_enum = NULL;
        }
        break;
    }

    default:
        return DefWindowProcA(hwnd, message, wparam, lparam);
    }

    return 0;
}


/*---------------------------------------------------------------------*
 *  Implementation of the internal IDataObject interface exposed by
 *  the OLE clipboard.
 *---------------------------------------------------------------------*/


/************************************************************************
 * OLEClipbrd_IDataObject_QueryInterface (IUnknown)
 *
 * See Windows documentation for more details on IUnknown methods.
 */
static HRESULT WINAPI OLEClipbrd_IDataObject_QueryInterface(
            IDataObject*     iface,
            REFIID           riid,
            void**           ppvObject)
{
  ole_clipbrd *This = impl_from_IDataObject(iface);
  TRACE("(%p)->(IID:%s, %p)\n", This, debugstr_guid(riid), ppvObject);

  if ( (This==0) || (ppvObject==0) )
    return E_INVALIDARG;

  *ppvObject = 0;

  if (IsEqualIID(&IID_IUnknown, riid) ||
      IsEqualIID(&IID_IDataObject, riid))
  {
    *ppvObject = iface;
  }
  else
  {
    WARN( "() : asking for unsupported interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
  }

  IUnknown_AddRef((IUnknown*)*ppvObject);

  return S_OK;
}

/************************************************************************
 * OLEClipbrd_IDataObject_AddRef (IUnknown)
 *
 * See Windows documentation for more details on IUnknown methods.
 */
static ULONG WINAPI OLEClipbrd_IDataObject_AddRef(
            IDataObject*     iface)
{
  ole_clipbrd *This = impl_from_IDataObject(iface);

  TRACE("(%p)->(count=%u)\n",This, This->ref);

  return InterlockedIncrement(&This->ref);
}

/***********************************************************************
 * OLEClipbrd_DestroyWindow(HWND)
 * Destroy the clipboard window and unregister its class
 */
static void OLEClipbrd_DestroyWindow(HWND hwnd)
{
  DestroyWindow(hwnd);
  UnregisterClassA( OLEClipbrd_WNDCLASS, 0 );
}

static void OLEClipbrd_Destroy(ole_clipbrd* This)
{
    TRACE("()\n");

    if (!This) return;

    theOleClipboard = NULL;

    if ( This->hWndClipboard )
        OLEClipbrd_DestroyWindow(This->hWndClipboard);

    HeapFree(GetProcessHeap(), 0, This);
}

/************************************************************************
 * OLEClipbrd_IDataObject_Release (IUnknown)
 *
 * See Windows documentation for more details on IUnknown methods.
 */
static ULONG WINAPI OLEClipbrd_IDataObject_Release(
            IDataObject*     iface)
{
  ole_clipbrd *This = impl_from_IDataObject(iface);
  ULONG ref;

  TRACE("(%p)->(count=%u)\n",This, This->ref);

  ref = InterlockedDecrement(&This->ref);

  if (ref == 0)
  {
    OLEClipbrd_Destroy(This);
  }

  return ref;
}


/************************************************************************
 * OLEClipbrd_IDataObject_GetData (IDataObject)
 *
 * The OLE Clipboard's implementation of this method delegates to
 * a data source if there is one or wraps around the windows clipboard
 *
 * See Windows documentation for more details on IDataObject methods.
 */
static HRESULT WINAPI OLEClipbrd_IDataObject_GetData(
	    IDataObject*     iface,
	    LPFORMATETC      pformatetcIn,
	    STGMEDIUM*       pmedium)
{
  HANDLE      hData = 0;
  LPVOID src;
  ole_clipbrd *This = impl_from_IDataObject(iface);

  TRACE("(%p,%p,%p)\n", iface, pformatetcIn, pmedium);

  if ( !pformatetcIn || !pmedium )
    return E_INVALIDARG;

  /*
   * If we have a data source placed on the clipboard (via OleSetClipboard)
   * simply delegate to the source object's QueryGetData
   * NOTE: This code assumes that the IDataObject is in the same address space!
   * We will need to add marshalling support when Wine handles multiple processes.
   */
  if ( This->pIDataObjectSrc )
  {
    return IDataObject_GetData(This->pIDataObjectSrc, pformatetcIn, pmedium);
  }

  if ( pformatetcIn->lindex != -1 )
    return DV_E_FORMATETC;

  if ( (pformatetcIn->tymed & TYMED_HGLOBAL) != TYMED_HGLOBAL )
    return DV_E_TYMED;
/*
   if ( pformatetcIn->dwAspect != DVASPECT_CONTENT )
     return DV_E_DVASPECT;
*/

  /*
   * Otherwise, get the data from the windows clipboard using GetClipboardData
   */
  if ( !OpenClipboard(theOleClipboard->hWndClipboard)) return CLIPBRD_E_CANT_OPEN;

  hData = GetClipboardData(pformatetcIn->cfFormat);

  /* Must make a copy of global handle returned by GetClipboardData; it
   * is not valid after we call CloseClipboard
   * Application is responsible for freeing the memory (Forte Agent does this)
   */
  src = GlobalLock(hData);
  if(src) {
      LPVOID dest;
      ULONG  size;
      HANDLE hDest;

      size = GlobalSize(hData);
      hDest = GlobalAlloc(GHND, size);
      dest  = GlobalLock(hDest);
      memcpy(dest, src, size);
      GlobalUnlock(hDest);
      GlobalUnlock(hData);
      hData = hDest;
  }

  /*
   * Return the clipboard data in the storage medium structure
   */
  pmedium->tymed = (hData == 0) ? TYMED_NULL : TYMED_HGLOBAL;
  pmedium->u.hGlobal = hData;
  pmedium->pUnkForRelease = NULL;

  if ( !CloseClipboard() ) return CLIPBRD_E_CANT_CLOSE;

  return (hData == 0) ? DV_E_FORMATETC : S_OK;
}

static HRESULT WINAPI OLEClipbrd_IDataObject_GetDataHere(
	    IDataObject*     iface,
	    LPFORMATETC      pformatetc,
	    STGMEDIUM*       pmedium)
{
  FIXME(": Stub\n");
  return E_NOTIMPL;
}

/************************************************************************
 * OLEClipbrd_IDataObject_QueryGetData (IDataObject)
 *
 * The OLE Clipboard's implementation of this method delegates to
 * a data source if there is one or wraps around the windows clipboard
 * function IsClipboardFormatAvailable() otherwise.
 *
 * See Windows documentation for more details on IDataObject methods.
 */
static HRESULT WINAPI OLEClipbrd_IDataObject_QueryGetData(
	    IDataObject*     iface,
	    LPFORMATETC      pformatetc)
{
  TRACE("(%p, %p)\n", iface, pformatetc);

  if (!pformatetc)
    return E_INVALIDARG;

  if ( pformatetc->dwAspect != DVASPECT_CONTENT )
    return DV_E_FORMATETC;

  if ( pformatetc->lindex != -1 )
    return DV_E_FORMATETC;

  /*
   * Delegate to the Windows clipboard function IsClipboardFormatAvailable
   */
  return (IsClipboardFormatAvailable(pformatetc->cfFormat)) ? S_OK : DV_E_CLIPFORMAT;
}

/************************************************************************
 * OLEClipbrd_IDataObject_GetCanonicalFormatEtc (IDataObject)
 *
 * See Windows documentation for more details on IDataObject methods.
 */
static HRESULT WINAPI OLEClipbrd_IDataObject_GetCanonicalFormatEtc(
	    IDataObject*     iface,
	    LPFORMATETC      pformatectIn,
	    LPFORMATETC      pformatetcOut)
{
  TRACE("(%p, %p, %p)\n", iface, pformatectIn, pformatetcOut);

  if ( !pformatectIn || !pformatetcOut )
    return E_INVALIDARG;

  *pformatetcOut = *pformatectIn;
  return DATA_S_SAMEFORMATETC;
}

/************************************************************************
 * OLEClipbrd_IDataObject_SetData (IDataObject)
 *
 * The OLE Clipboard's does not implement this method
 *
 * See Windows documentation for more details on IDataObject methods.
 */
static HRESULT WINAPI OLEClipbrd_IDataObject_SetData(
	    IDataObject*     iface,
	    LPFORMATETC      pformatetc,
	    STGMEDIUM*       pmedium,
	    BOOL             fRelease)
{
  TRACE("\n");
  return E_NOTIMPL;
}

/************************************************************************
 * OLEClipbrd_IDataObject_EnumFormatEtc (IDataObject)
 *
 * See Windows documentation for more details on IDataObject methods.
 */
static HRESULT WINAPI OLEClipbrd_IDataObject_EnumFormatEtc(
	    IDataObject*     iface,
	    DWORD            dwDirection,
	    IEnumFORMATETC** enum_fmt)
{
    HRESULT hr = S_OK;
    ole_clipbrd *This = impl_from_IDataObject(iface);
    HGLOBAL handle;
    ole_priv_data *data = NULL;

    TRACE("(%p, %x, %p)\n", iface, dwDirection, enum_fmt);

    *enum_fmt = NULL;

    if ( dwDirection != DATADIR_GET ) return E_NOTIMPL;
    if ( !OpenClipboard(This->hWndClipboard) ) return CLIPBRD_E_CANT_OPEN;

    handle = GetClipboardData( ole_priv_data_clipboard_format );
    if(handle)
    {
        ole_priv_data *src = GlobalLock(handle);
        if(src)
        {
            /* FIXME: sanity check on size */
            data = HeapAlloc(GetProcessHeap(), 0, src->size);
            if(!data)
            {
                GlobalUnlock(handle);
                hr = E_OUTOFMEMORY;
                goto end;
            }
            memcpy(data, src, src->size);
            GlobalUnlock(handle);
        }
    }

    if(!data) hr = create_empty_priv_data(&data);
    if(FAILED(hr)) goto end;

    hr = enum_fmtetc_construct( data, 0, enum_fmt );

end:
    if ( !CloseClipboard() ) hr = CLIPBRD_E_CANT_CLOSE;
    return hr;
}

/************************************************************************
 * OLEClipbrd_IDataObject_DAdvise (IDataObject)
 *
 * The OLE Clipboard's does not implement this method
 *
 * See Windows documentation for more details on IDataObject methods.
 */
static HRESULT WINAPI OLEClipbrd_IDataObject_DAdvise(
	    IDataObject*     iface,
	    FORMATETC*       pformatetc,
	    DWORD            advf,
	    IAdviseSink*     pAdvSink,
	    DWORD*           pdwConnection)
{
  TRACE("\n");
  return E_NOTIMPL;
}

/************************************************************************
 * OLEClipbrd_IDataObject_DUnadvise (IDataObject)
 *
 * The OLE Clipboard's does not implement this method
 *
 * See Windows documentation for more details on IDataObject methods.
 */
static HRESULT WINAPI OLEClipbrd_IDataObject_DUnadvise(
	    IDataObject*     iface,
	    DWORD            dwConnection)
{
  TRACE("\n");
  return E_NOTIMPL;
}

/************************************************************************
 * OLEClipbrd_IDataObject_EnumDAdvise (IDataObject)
 *
 * The OLE Clipboard does not implement this method
 *
 * See Windows documentation for more details on IDataObject methods.
 */
static HRESULT WINAPI OLEClipbrd_IDataObject_EnumDAdvise(
	    IDataObject*     iface,
	    IEnumSTATDATA**  ppenumAdvise)
{
  TRACE("\n");
  return E_NOTIMPL;
}

static const IDataObjectVtbl OLEClipbrd_IDataObject_VTable =
{
  OLEClipbrd_IDataObject_QueryInterface,
  OLEClipbrd_IDataObject_AddRef,
  OLEClipbrd_IDataObject_Release,
  OLEClipbrd_IDataObject_GetData,
  OLEClipbrd_IDataObject_GetDataHere,
  OLEClipbrd_IDataObject_QueryGetData,
  OLEClipbrd_IDataObject_GetCanonicalFormatEtc,
  OLEClipbrd_IDataObject_SetData,
  OLEClipbrd_IDataObject_EnumFormatEtc,
  OLEClipbrd_IDataObject_DAdvise,
  OLEClipbrd_IDataObject_DUnadvise,
  OLEClipbrd_IDataObject_EnumDAdvise
};

/*---------------------------------------------------------------------*
 *           Internal implementation methods for the OLE clipboard
 *---------------------------------------------------------------------*/

/*********************************************************
 * Construct the OLEClipbrd class.
 */
static ole_clipbrd* OLEClipbrd_Construct(void)
{
    ole_clipbrd* This;

    This = HeapAlloc( GetProcessHeap(), 0, sizeof(*This) );
    if (!This) return NULL;

    This->lpvtbl = &OLEClipbrd_IDataObject_VTable;
    This->ref = 1;

    This->hWndClipboard = NULL;
    This->pIDataObjectSrc = NULL;
    This->cached_enum = NULL;

    theOleClipboard = This;
    return This;
}

static void register_clipboard_formats(void)
{
    static const WCHAR DataObjectW[] = { 'D','a','t','a','O','b','j','e','c','t',0 };
    static const WCHAR OlePrivateDataW[] = { 'O','l','e',' ','P','r','i','v','a','t','e',' ','D','a','t','a',0 };
    static const WCHAR EmbedSourceW[] = { 'E','m','b','e','d',' ','S','o','u','r','c','e',0 };

    if(!dataobject_clipboard_format)
        dataobject_clipboard_format = RegisterClipboardFormatW(DataObjectW);
    if(!ole_priv_data_clipboard_format)
        ole_priv_data_clipboard_format = RegisterClipboardFormatW(OlePrivateDataW);
    if(!embed_source_clipboard_format)
        embed_source_clipboard_format = RegisterClipboardFormatW(EmbedSourceW);
}

/***********************************************************************
 * OLEClipbrd_Initialize()
 * Initializes the OLE clipboard.
 */
void OLEClipbrd_Initialize(void)
{
  register_clipboard_formats();

  if ( !theOleClipboard )
  {
    TRACE("()\n");
    theOleClipboard = OLEClipbrd_Construct();
  }
}


/***********************************************************************
 * OLEClipbrd_UnInitialize()
 * Un-Initializes the OLE clipboard
 */
void OLEClipbrd_UnInitialize(void)
{
  TRACE("()\n");
  /*
   * Destroy the clipboard if no one holds a reference to us.
   * Note that the clipboard was created with a reference count of 1.
   */
  if ( theOleClipboard && (theOleClipboard->ref <= 1) )
  {
    OLEClipbrd_Destroy( theOleClipboard );
  }
  else
  {
    WARN( "() : OLEClipbrd_UnInitialize called while client holds an IDataObject reference!\n");
  }
}

/***********************************************************************
 * OLEClipbrd_CreateWindow()
 * Create the clipboard window
 */
static HWND OLEClipbrd_CreateWindow(void)
{
  HWND hwnd = 0;
  WNDCLASSEXA wcex;

  /*
   * Register the clipboard window class if necessary
   */
    ZeroMemory( &wcex, sizeof(WNDCLASSEXA));

    wcex.cbSize         = sizeof(WNDCLASSEXA);
    /* Windows creates this class with a style mask of 0
     * We don't bother doing this since the FindClassByAtom code
     * would have to be changed to deal with this idiosyncrasy. */
    wcex.style          = CS_GLOBALCLASS;
    wcex.lpfnWndProc    = clipbrd_wndproc;
    wcex.hInstance      = 0;
    wcex.lpszClassName  = OLEClipbrd_WNDCLASS;

    RegisterClassExA(&wcex);

  /*
   * Create a hidden window to receive OLE clipboard messages
   */

/*
 *  If we need to store state info we can store it here.
 *  For now we don't need this functionality.
 *   ClipboardWindowInfo clipboardInfo;
 *   ZeroMemory( &trackerInfo, sizeof(ClipboardWindowInfo));
 */

  hwnd = CreateWindowA(OLEClipbrd_WNDCLASS,
				    "ClipboardWindow",
				    WS_POPUP | WS_CLIPSIBLINGS | WS_OVERLAPPED,
				    CW_USEDEFAULT, CW_USEDEFAULT,
				    CW_USEDEFAULT, CW_USEDEFAULT,
				    0,
				    0,
				    0,
				    0 /*(LPVOID)&clipboardInfo */);

  return hwnd;
}

/*********************************************************************
 *          set_clipboard_formats
 *
 * Enumerate all formats supported by the source and make
 * those formats available using delayed rendering using SetClipboardData.
 * Cache the enumeration list and make that list visibile as the
 * 'Ole Private Data' format on the clipboard.
 *
 */
static HRESULT set_clipboard_formats(ole_clipbrd *clipbrd, IDataObject *data)
{
    HRESULT hr;
    FORMATETC fmt;
    IEnumFORMATETC *enum_fmt;
    HGLOBAL priv_data_handle;
    DWORD target_offset;
    ole_priv_data *priv_data;
    DWORD count = 0, needed = sizeof(*priv_data), idx;

    hr = IDataObject_EnumFormatEtc(data, DATADIR_GET, &enum_fmt);
    if(FAILED(hr)) return hr;

    while(IEnumFORMATETC_Next(enum_fmt, 1, &fmt, NULL) == S_OK)
    {
        count++;
        needed += sizeof(priv_data->entries[0]);
        if(fmt.ptd)
        {
            needed += fmt.ptd->tdSize;
            CoTaskMemFree(fmt.ptd);
        }
    }

    /* Windows pads the list with two empty ole_priv_data_entries, one
     * after the entries array and one after the target device data.
     * Allocating with zero init to zero these pads. */

    needed += sizeof(priv_data->entries[0]); /* initialisation of needed includes one of these. */
    priv_data_handle = GlobalAlloc(GMEM_DDESHARE | GMEM_MOVEABLE | GMEM_ZEROINIT, needed);
    priv_data = GlobalLock(priv_data_handle);

    priv_data->unk1 = 0;
    priv_data->size = needed;
    priv_data->unk2 = 1;
    priv_data->count = count;
    priv_data->unk3[0] = 0;
    priv_data->unk3[1] = 0;

    IEnumFORMATETC_Reset(enum_fmt);

    idx = 0;
    target_offset = FIELD_OFFSET(ole_priv_data, entries[count + 1]); /* count entries + one pad. */

    while(IEnumFORMATETC_Next(enum_fmt, 1, &fmt, NULL) == S_OK)
    {
        TRACE("%s\n", dump_fmtetc(&fmt));

        priv_data->entries[idx].fmtetc = fmt;
        if(fmt.ptd)
        {
            memcpy((char*)priv_data + target_offset, fmt.ptd, fmt.ptd->tdSize);
            priv_data->entries[idx].fmtetc.ptd = (DVTARGETDEVICE*)target_offset;
            target_offset += fmt.ptd->tdSize;
            CoTaskMemFree(fmt.ptd);
        }

        priv_data->entries[idx].first_use = !find_format_in_list(priv_data->entries, idx, fmt.cfFormat);
        priv_data->entries[idx].unk[0] = 0;
        priv_data->entries[idx].unk[1] = 0;

        if (priv_data->entries[idx].first_use)
            SetClipboardData(fmt.cfFormat, NULL);

        idx++;
    }

    IEnumFORMATETC_Release(enum_fmt);

    /* Cache the list and fixup any target device offsets to ptrs */
    clipbrd->cached_enum = HeapAlloc(GetProcessHeap(), 0, needed);
    memcpy(clipbrd->cached_enum, priv_data, needed);
    for(idx = 0; idx < clipbrd->cached_enum->count; idx++)
        if(clipbrd->cached_enum->entries[idx].fmtetc.ptd)
            clipbrd->cached_enum->entries[idx].fmtetc.ptd =
                (DVTARGETDEVICE *)((char*)clipbrd->cached_enum + (DWORD)clipbrd->cached_enum->entries[idx].fmtetc.ptd);

    GlobalUnlock(priv_data_handle);
    SetClipboardData(ole_priv_data_clipboard_format, priv_data_handle);

    return S_OK;
}

/*********************************************************************
 *          set_dataobject_format
 *
 * Windows creates a 'DataObject' clipboard format that contains the
 * clipboard window's HWND or NULL if the Ole clipboard has been flushed.
 */
static HRESULT set_dataobject_format(HWND hwnd)
{
    HGLOBAL h = GlobalAlloc(GMEM_DDESHARE | GMEM_MOVEABLE, sizeof(hwnd));
    HWND *data;

    if(!h) return E_OUTOFMEMORY;

    data = GlobalLock(h);
    *data = hwnd;
    GlobalUnlock(h);

    if(!SetClipboardData(dataobject_clipboard_format, h))
    {
        GlobalFree(h);
        return CLIPBRD_E_CANT_SET;
    }

    return S_OK;
}

/*---------------------------------------------------------------------*
 *           Win32 OLE clipboard API
 *---------------------------------------------------------------------*/

/***********************************************************************
 *           OleSetClipboard     [OLE32.@]
 *  Places a pointer to the specified data object onto the clipboard,
 *  making the data object accessible to the OleGetClipboard function.
 *
 * RETURNS
 *
 *    S_OK                  IDataObject pointer placed on the clipboard
 *    CLIPBRD_E_CANT_OPEN   OpenClipboard failed
 *    CLIPBRD_E_CANT_EMPTY  EmptyClipboard failed
 *    CLIPBRD_E_CANT_CLOSE  CloseClipboard failed
 *    CLIPBRD_E_CANT_SET    SetClipboard failed
 */

HRESULT WINAPI OleSetClipboard(IDataObject* pDataObj)
{
  HRESULT hr = S_OK;
  struct oletls *info = COM_CurrentInfo();

  TRACE("(%p)\n", pDataObj);

  if(!info)
    WARN("Could not allocate tls\n");
  else
    if(!info->ole_inits)
      return CO_E_NOTINITIALIZED;

  OLEClipbrd_Initialize();

  /*
   * If the Ole clipboard window hasn't been created yet, create it now.
   */
  if ( !theOleClipboard->hWndClipboard )
    theOleClipboard->hWndClipboard = OLEClipbrd_CreateWindow();

  if ( !theOleClipboard->hWndClipboard ) return E_FAIL;

  if ( !OpenClipboard(theOleClipboard->hWndClipboard) ) return CLIPBRD_E_CANT_OPEN;

  /*
   * Empty the current clipboard and make our window the clipboard owner
   * NOTE: This will trigger a WM_DESTROYCLIPBOARD message
   */
  if ( !EmptyClipboard() )
  {
    hr = CLIPBRD_E_CANT_EMPTY;
    goto end;
  }

  /*
   * If we are already holding on to an IDataObject first release that.
   */
  if ( theOleClipboard->pIDataObjectSrc )
  {
    IDataObject_Release(theOleClipboard->pIDataObjectSrc);
    theOleClipboard->pIDataObjectSrc = NULL;
    HeapFree(GetProcessHeap(), 0, theOleClipboard->cached_enum);
    theOleClipboard->cached_enum = NULL;
  }

  /* A NULL value indicates that the clipboard should be emptied. */
  theOleClipboard->pIDataObjectSrc = pDataObj;
  if ( pDataObj )
  {
    IDataObject_AddRef(theOleClipboard->pIDataObjectSrc);
    hr = set_clipboard_formats(theOleClipboard, pDataObj);
    if(FAILED(hr)) goto end;
  }

  hr = set_dataobject_format(theOleClipboard->hWndClipboard);

end:

  if ( !CloseClipboard() )  hr = CLIPBRD_E_CANT_CLOSE;

  if ( FAILED(hr) )
  {
    if (theOleClipboard->pIDataObjectSrc)
    {
      IDataObject_Release(theOleClipboard->pIDataObjectSrc);
      theOleClipboard->pIDataObjectSrc = NULL;
      HeapFree(GetProcessHeap(), 0, theOleClipboard->cached_enum);
      theOleClipboard->cached_enum = NULL;
    }
  }

  return hr;
}


/***********************************************************************
 * OleGetClipboard [OLE32.@]
 * Returns a pointer to our internal IDataObject which represents the conceptual
 * state of the Windows clipboard. If the current clipboard already contains
 * an IDataObject, our internal IDataObject will delegate to this object.
 */
HRESULT WINAPI OleGetClipboard(IDataObject** ppDataObj)
{
  HRESULT hr = S_OK;
  TRACE("()\n");

  /*
   * Make sure we have a clipboard object
   */
  OLEClipbrd_Initialize();

  if (!theOleClipboard)
    return E_OUTOFMEMORY;

  /* Return a reference counted IDataObject */
  hr = IDataObject_QueryInterface( (IDataObject*)&(theOleClipboard->lpvtbl),
                                   &IID_IDataObject,  (void**)ppDataObj);
  return hr;
}

/******************************************************************************
 *              OleFlushClipboard        [OLE32.@]
 *  Renders the data from the source IDataObject into the windows clipboard
 *
 *  TODO: OleFlushClipboard needs to additionally handle TYMED_IStorage media
 *  by copying the storage into global memory. Subsequently the default
 *  data object exposed through OleGetClipboard must convert this TYMED_HGLOBAL
 *  back to TYMED_IStorage.
 */
HRESULT WINAPI OleFlushClipboard(void)
{
  IEnumFORMATETC* penumFormatetc = NULL;
  FORMATETC rgelt;
  HRESULT hr = S_OK;

  TRACE("()\n");

  OLEClipbrd_Initialize();

  /*
   * Already flushed or no source DataObject? Nothing to do.
   */
  if (!theOleClipboard->pIDataObjectSrc)
    return S_OK;

  if (!OpenClipboard(theOleClipboard->hWndClipboard))
    return CLIPBRD_E_CANT_OPEN;

  /*
   * Render all HGLOBAL formats supported by the source into
   * the windows clipboard.
   */
  if ( FAILED( hr = IDataObject_EnumFormatEtc( theOleClipboard->pIDataObjectSrc,
                                               DATADIR_GET,
                                               &penumFormatetc) ))
    goto end;


  while ( S_OK == IEnumFORMATETC_Next(penumFormatetc, 1, &rgelt, NULL) )
  {
    if ( rgelt.tymed == TYMED_HGLOBAL )
    {
      CHAR szFmtName[80];
      TRACE("(cfFormat=%d:%s)\n", rgelt.cfFormat,
            GetClipboardFormatNameA(rgelt.cfFormat, szFmtName, sizeof(szFmtName)-1)
              ? szFmtName : "");

      if ( FAILED(render_format( theOleClipboard->pIDataObjectSrc, &rgelt )) )
        continue;
    }
  }

  IEnumFORMATETC_Release(penumFormatetc);

  hr = set_dataobject_format(NULL);

  IDataObject_Release(theOleClipboard->pIDataObjectSrc);
  theOleClipboard->pIDataObjectSrc = NULL;
  HeapFree(GetProcessHeap(), 0, theOleClipboard->cached_enum);
  theOleClipboard->cached_enum = NULL;

end:

  if ( !CloseClipboard() ) hr = CLIPBRD_E_CANT_CLOSE;

  return hr;
}


/***********************************************************************
 *           OleIsCurrentClipboard [OLE32.@]
 */
HRESULT WINAPI OleIsCurrentClipboard(IDataObject *pDataObject)
{
  TRACE("()\n");
  /*
   * Make sure we have a clipboard object
   */
  OLEClipbrd_Initialize();

  if (!theOleClipboard)
    return E_OUTOFMEMORY;

  if (pDataObject == NULL)
    return S_FALSE;

  return (pDataObject == theOleClipboard->pIDataObjectSrc) ? S_OK : S_FALSE;
}