summaryrefslogtreecommitdiffstats
path: root/widget/windows/nsClipboard.cpp
blob: c93f351c8706d29a3e15c47a455c73fc7024ea3e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsClipboard.h"
#include <ole2.h>
#include <shlobj.h>
#include <intshcut.h>

// shellapi.h is needed to build with WIN32_LEAN_AND_MEAN
#include <shellapi.h>

#include "nsArrayUtils.h"
#include "nsCOMPtr.h"
#include "nsDataObj.h"
#include "nsIClipboardOwner.h"
#include "nsString.h"
#include "nsNativeCharsetUtils.h"
#include "nsIFormatConverter.h"
#include "nsITransferable.h"
#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsXPIDLString.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsPrimitiveHelpers.h"
#include "nsIWidget.h"
#include "nsIComponentManager.h"
#include "nsWidgetsCID.h"
#include "nsCRT.h"
#include "nsNetUtil.h"
#include "nsIFileProtocolHandler.h"
#include "nsIOutputStream.h"
#include "nsEscape.h"
#include "nsIObserverService.h"
#include "nsMimeTypes.h"
#include "imgITools.h"

using mozilla::LogLevel;

PRLogModuleInfo* gWin32ClipboardLog = nullptr;

// oddly, this isn't in the MSVC headers anywhere.
UINT nsClipboard::CF_HTML = ::RegisterClipboardFormatW(L"HTML Format");
UINT nsClipboard::CF_CUSTOMTYPES = ::RegisterClipboardFormatW(L"application/x-moz-custom-clipdata");


//-------------------------------------------------------------------------
//
// nsClipboard constructor
//
//-------------------------------------------------------------------------
nsClipboard::nsClipboard() : nsBaseClipboard()
{
  if (!gWin32ClipboardLog) {
    gWin32ClipboardLog = PR_NewLogModule("nsClipboard");
  }

  mIgnoreEmptyNotification = false;
  mWindow         = nullptr;

  // Register for a shutdown notification so that we can flush data
 // to the OS clipboard.
  nsCOMPtr<nsIObserverService> observerService =
    do_GetService("@mozilla.org/observer-service;1");
  if (observerService)
    observerService->AddObserver(this, NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID, PR_FALSE);
}

//-------------------------------------------------------------------------
// nsClipboard destructor
//-------------------------------------------------------------------------
nsClipboard::~nsClipboard()
{

}

NS_IMPL_ISUPPORTS_INHERITED(nsClipboard, nsBaseClipboard, nsIObserver)

NS_IMETHODIMP
nsClipboard::Observe(nsISupports *aSubject, const char *aTopic,
                     const char16_t *aData)
{
  // This will be called on shutdown.
  ::OleFlushClipboard();
  ::CloseClipboard();

  return NS_OK;
}

//-------------------------------------------------------------------------
UINT nsClipboard::GetFormat(const char* aMimeStr, bool aMapHTMLMime)
{
  UINT format;

  if (strcmp(aMimeStr, kTextMime) == 0)
    format = CF_TEXT;
  else if (strcmp(aMimeStr, kUnicodeMime) == 0)
    format = CF_UNICODETEXT;
  else if (strcmp(aMimeStr, kRTFMime) == 0)
    format = ::RegisterClipboardFormat(L"Rich Text Format");
  else if (strcmp(aMimeStr, kJPEGImageMime) == 0 ||
           strcmp(aMimeStr, kJPGImageMime) == 0 ||
           strcmp(aMimeStr, kPNGImageMime) == 0)
    format = CF_DIBV5;
  else if (strcmp(aMimeStr, kFileMime) == 0 ||
           strcmp(aMimeStr, kFilePromiseMime) == 0)
    format = CF_HDROP;
  else if (strcmp(aMimeStr, kNativeHTMLMime) == 0 ||
           aMapHTMLMime && strcmp(aMimeStr, kHTMLMime) == 0)
    format = CF_HTML;
  else if (strcmp(aMimeStr, kCustomTypesMime) == 0)
    format = CF_CUSTOMTYPES;
  else
    format = ::RegisterClipboardFormatW(NS_ConvertASCIItoUTF16(aMimeStr).get());

  return format;
}

//-------------------------------------------------------------------------
nsresult nsClipboard::CreateNativeDataObject(nsITransferable * aTransferable, IDataObject ** aDataObj, nsIURI * uri)
{
  if (nullptr == aTransferable) {
    return NS_ERROR_FAILURE;
  }

  // Create our native DataObject that implements 
  // the OLE IDataObject interface
  nsDataObj * dataObj = new nsDataObj(uri);

  if (!dataObj) 
    return NS_ERROR_OUT_OF_MEMORY;

  dataObj->AddRef();

  // Now set it up with all the right data flavors & enums
  nsresult res = SetupNativeDataObject(aTransferable, dataObj);
  if (NS_OK == res) {
    *aDataObj = dataObj; 
  } else {
    delete dataObj;
  }
  return res;
}

//-------------------------------------------------------------------------
nsresult nsClipboard::SetupNativeDataObject(nsITransferable * aTransferable, IDataObject * aDataObj)
{
  if (nullptr == aTransferable || nullptr == aDataObj) {
    return NS_ERROR_FAILURE;
  }

  nsDataObj * dObj = static_cast<nsDataObj *>(aDataObj);

  // Now give the Transferable to the DataObject 
  // for getting the data out of it
  dObj->SetTransferable(aTransferable);

  // Get the transferable list of data flavors
  nsCOMPtr<nsIArray> dfList;
  aTransferable->FlavorsTransferableCanExport(getter_AddRefs(dfList));

  // Walk through flavors that contain data and register them
  // into the DataObj as supported flavors
  uint32_t i;
  uint32_t cnt;
  dfList->GetLength(&cnt);
  for (i=0;i<cnt;i++) {
    nsCOMPtr<nsISupportsCString> currentFlavor = do_QueryElementAt(dfList, i);
    if ( currentFlavor ) {
      nsXPIDLCString flavorStr;
      currentFlavor->ToString(getter_Copies(flavorStr));
      // When putting data onto the clipboard, we want to maintain kHTMLMime
      // ("text/html") and not map it to CF_HTML here since this will be done below.
      UINT format = GetFormat(flavorStr, false);

      // Now tell the native IDataObject about both our mime type and 
      // the native data format
      FORMATETC fe;
      SET_FORMATETC(fe, format, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
      dObj->AddDataFlavor(flavorStr, &fe);
      
      // Do various things internal to the implementation, like map one
      // flavor to another or add additional flavors based on what's required
      // for the win32 impl.
      if ( strcmp(flavorStr, kUnicodeMime) == 0 ) {
        // if we find text/unicode, also advertise text/plain (which we will convert
        // on our own in nsDataObj::GetText().
        FORMATETC textFE;
        SET_FORMATETC(textFE, CF_TEXT, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
        dObj->AddDataFlavor(kTextMime, &textFE);
      }
      else if ( strcmp(flavorStr, kHTMLMime) == 0 ) {      
        // if we find text/html, also advertise win32's html flavor (which we will convert
        // on our own in nsDataObj::GetText().
        FORMATETC htmlFE;
        SET_FORMATETC(htmlFE, CF_HTML, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL);
        dObj->AddDataFlavor(kHTMLMime, &htmlFE);     
      }
      else if ( strcmp(flavorStr, kURLMime) == 0 ) {
        // if we're a url, in addition to also being text, we need to register
        // the "file" flavors so that the win32 shell knows to create an internet
        // shortcut when it sees one of these beasts.
        FORMATETC shortcutFE;
        SET_FORMATETC(shortcutFE, ::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORA), 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
        dObj->AddDataFlavor(kURLMime, &shortcutFE);      
        SET_FORMATETC(shortcutFE, ::RegisterClipboardFormat(CFSTR_FILEDESCRIPTORW), 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
        dObj->AddDataFlavor(kURLMime, &shortcutFE);      
        SET_FORMATETC(shortcutFE, ::RegisterClipboardFormat(CFSTR_FILECONTENTS), 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
        dObj->AddDataFlavor(kURLMime, &shortcutFE);  
        SET_FORMATETC(shortcutFE, ::RegisterClipboardFormat(CFSTR_INETURLA), 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
        dObj->AddDataFlavor(kURLMime, &shortcutFE);      
        SET_FORMATETC(shortcutFE, ::RegisterClipboardFormat(CFSTR_INETURLW), 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
        dObj->AddDataFlavor(kURLMime, &shortcutFE);      
      }
      else if ( strcmp(flavorStr, kPNGImageMime) == 0 || strcmp(flavorStr, kJPEGImageMime) == 0 ||
                strcmp(flavorStr, kJPGImageMime) == 0 || strcmp(flavorStr, kGIFImageMime) == 0 ||
                strcmp(flavorStr, kNativeImageMime) == 0  ) {
        // if we're an image, register the native bitmap flavor
        FORMATETC imageFE;
        // Add DIBv5
        SET_FORMATETC(imageFE, CF_DIBV5, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
        dObj->AddDataFlavor(flavorStr, &imageFE);
        // Add DIBv3 
        SET_FORMATETC(imageFE, CF_DIB, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
        dObj->AddDataFlavor(flavorStr, &imageFE);
      }
      else if ( strcmp(flavorStr, kFilePromiseMime) == 0 ) {
         // if we're a file promise flavor, also register the 
         // CFSTR_PREFERREDDROPEFFECT format.  The data object
         // returns a value of DROPEFFECTS_MOVE to the drop target
         // when it asks for the value of this format.  This causes
         // the file to be moved from the temporary location instead
         // of being copied.  The right thing to do here is to call
         // SetData() on the data object and set the value of this format
         // to DROPEFFECTS_MOVE on this particular data object.  But,
         // since all the other clipboard formats follow the model of setting
         // data on the data object only when the drop object calls GetData(),
         // I am leaving this format's value hard coded in the data object.
         // We can change this if other consumers of this format get added to this
         // codebase and they need different values.
        FORMATETC shortcutFE;
        SET_FORMATETC(shortcutFE, ::RegisterClipboardFormat(CFSTR_PREFERREDDROPEFFECT), 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL)
        dObj->AddDataFlavor(kFilePromiseMime, &shortcutFE);
      }
    }
  }

  return NS_OK;
}

//-------------------------------------------------------------------------
NS_IMETHODIMP nsClipboard::SetNativeClipboardData ( int32_t aWhichClipboard )
{
  if ( aWhichClipboard != kGlobalClipboard )
    return NS_ERROR_FAILURE;

  mIgnoreEmptyNotification = true;

  // make sure we have a good transferable
  if (nullptr == mTransferable) {
    return NS_ERROR_FAILURE;
  }

  IDataObject * dataObj;
  if ( NS_SUCCEEDED(CreateNativeDataObject(mTransferable, &dataObj, nullptr)) ) { // this add refs dataObj
    ::OleSetClipboard(dataObj);
    dataObj->Release();
  } else {
    // Clear the native clipboard
    ::OleSetClipboard(nullptr);
  }

  mIgnoreEmptyNotification = false;

  return NS_OK;
}


//-------------------------------------------------------------------------
nsresult nsClipboard::GetGlobalData(HGLOBAL aHGBL, void ** aData, uint32_t * aLen)
{
  // Allocate a new memory buffer and copy the data from global memory.
  // Recall that win98 allocates to nearest DWORD boundary. As a safety
  // precaution, allocate an extra 3 bytes (but don't report them in |aLen|!)
  // and null them out to ensure that all of our NS_strlen calls will succeed.
  // NS_strlen operates on char16_t, so we need 3 NUL bytes to ensure it finds
  // a full NUL char16_t when |*aLen| is odd.
  nsresult  result = NS_ERROR_FAILURE;
  if (aHGBL != nullptr) {
    LPSTR lpStr = (LPSTR) GlobalLock(aHGBL);
    DWORD allocSize = GlobalSize(aHGBL);
    char* data = static_cast<char*>(malloc(allocSize + 3));
    if ( data ) {    
      memcpy ( data, lpStr, allocSize );
      data[allocSize] = data[allocSize + 1] = data[allocSize + 2] =
          '\0'; // null terminate for safety

      GlobalUnlock(aHGBL);
      *aData = data;
      *aLen = allocSize;

      result = NS_OK;
    }
  } else {
    // We really shouldn't ever get here
    // but just in case
    *aData = nullptr;
    *aLen  = 0;
    LPVOID lpMsgBuf;

    FormatMessageW( 
        FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
        nullptr,
        GetLastError(),
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
        (LPWSTR) &lpMsgBuf,
        0,
        nullptr 
    );

    // Display the string.
    MessageBoxW( nullptr, (LPCWSTR) lpMsgBuf, L"GetLastError",
                 MB_OK | MB_ICONINFORMATION );

    // Free the buffer.
    LocalFree( lpMsgBuf );    
  }

  return result;
}

//-------------------------------------------------------------------------
nsresult nsClipboard::GetNativeDataOffClipboard(nsIWidget * aWidget, UINT /*aIndex*/, UINT aFormat, void ** aData, uint32_t * aLen)
{
  HGLOBAL   hglb; 
  nsresult  result = NS_ERROR_FAILURE;

  HWND nativeWin = nullptr;
  if (::OpenClipboard(nativeWin)) { 
    hglb = ::GetClipboardData(aFormat); 
    result = GetGlobalData(hglb, aData, aLen);
    ::CloseClipboard();
  }
  return result;
}

static void DisplayErrCode(HRESULT hres) 
{
#if defined(DEBUG_rods) || defined(DEBUG_pinkerton)
  if (hres == E_INVALIDARG) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("E_INVALIDARG\n"));
  } else
  if (hres == E_UNEXPECTED) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("E_UNEXPECTED\n"));
  } else
  if (hres == E_OUTOFMEMORY) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("E_OUTOFMEMORY\n"));
  } else
  if (hres == DV_E_LINDEX ) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("DV_E_LINDEX\n"));
  } else
  if (hres == DV_E_FORMATETC) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("DV_E_FORMATETC\n"));
  }  else
  if (hres == DV_E_TYMED) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("DV_E_TYMED\n"));
  }  else
  if (hres == DV_E_DVASPECT) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("DV_E_DVASPECT\n"));
  }  else
  if (hres == OLE_E_NOTRUNNING) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("OLE_E_NOTRUNNING\n"));
  }  else
  if (hres == STG_E_MEDIUMFULL) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("STG_E_MEDIUMFULL\n"));
  }  else
  if (hres == DV_E_CLIPFORMAT) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("DV_E_CLIPFORMAT\n"));
  }  else
  if (hres == S_OK) {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, ("S_OK\n"));
  } else {
    MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, 
           ("****** DisplayErrCode 0x%X\n", hres));
  }
#endif
}

//-------------------------------------------------------------------------
static HRESULT FillSTGMedium(IDataObject * aDataObject, UINT aFormat, LPFORMATETC pFE, LPSTGMEDIUM pSTM, DWORD aTymed)
{
  SET_FORMATETC(*pFE, aFormat, 0, DVASPECT_CONTENT, -1, aTymed);

  // Starting by querying for the data to see if we can get it as from global memory
  HRESULT hres = S_FALSE;
  hres = aDataObject->QueryGetData(pFE);
  DisplayErrCode(hres);
  if (S_OK == hres) {
    hres = aDataObject->GetData(pFE, pSTM);
    DisplayErrCode(hres);
  }
  return hres;
}


//-------------------------------------------------------------------------
// If aFormat is CF_DIBV5, aMIMEImageFormat must be a type for which we have
// an image encoder (e.g. image/png).
// For other values of aFormat, it is OK to pass null for aMIMEImageFormat.
nsresult nsClipboard::GetNativeDataOffClipboard(IDataObject * aDataObject, UINT aIndex, UINT aFormat, const char * aMIMEImageFormat, void ** aData, uint32_t * aLen)
{
  nsresult result = NS_ERROR_FAILURE;
  *aData = nullptr;
  *aLen = 0;

  if ( !aDataObject )
    return result;

  UINT    format = aFormat;
  HRESULT hres   = S_FALSE;

  // XXX at the moment we only support global memory transfers
  // It is here where we will add support for native images 
  // and IStream
  FORMATETC fe;
  STGMEDIUM stm;
  hres = FillSTGMedium(aDataObject, format, &fe, &stm, TYMED_HGLOBAL);

  // Currently this is only handling TYMED_HGLOBAL data
  // For Text, Dibs, Files, and generic data (like HTML)
  if (S_OK == hres) {
    static CLIPFORMAT fileDescriptorFlavorA = ::RegisterClipboardFormat( CFSTR_FILEDESCRIPTORA ); 
    static CLIPFORMAT fileDescriptorFlavorW = ::RegisterClipboardFormat( CFSTR_FILEDESCRIPTORW ); 
    static CLIPFORMAT fileFlavor = ::RegisterClipboardFormat( CFSTR_FILECONTENTS ); 
    static CLIPFORMAT preferredDropEffect = ::RegisterClipboardFormat(CFSTR_PREFERREDDROPEFFECT);

    switch (stm.tymed) {
     case TYMED_HGLOBAL: 
        {
          switch (fe.cfFormat) {
            case CF_TEXT:
              {
                // Get the data out of the global data handle. The size we return
                // should not include the null because the other platforms don't
                // use nulls, so just return the length we get back from strlen(),
                // since we know CF_TEXT is null terminated. Recall that GetGlobalData() 
                // returns the size of the allocated buffer, not the size of the data 
                // (on 98, these are not the same) so we can't use that.
                uint32_t allocLen = 0;
                if ( NS_SUCCEEDED(GetGlobalData(stm.hGlobal, aData, &allocLen)) ) {
                  *aLen = strlen ( reinterpret_cast<char*>(*aData) );
                  result = NS_OK;
                }
              } break;

            case CF_UNICODETEXT:
              {
                // Get the data out of the global data handle. The size we return
                // should not include the null because the other platforms don't
                // use nulls, so just return the length we get back from strlen(),
                // since we know CF_UNICODETEXT is null terminated. Recall that GetGlobalData() 
                // returns the size of the allocated buffer, not the size of the data 
                // (on 98, these are not the same) so we can't use that.
                uint32_t allocLen = 0;
                if ( NS_SUCCEEDED(GetGlobalData(stm.hGlobal, aData, &allocLen)) ) {
                  *aLen = NS_strlen(reinterpret_cast<char16_t*>(*aData)) * 2;
                  result = NS_OK;
                }
              } break;

            case CF_DIBV5:
              if (aMIMEImageFormat)
              {
                uint32_t allocLen = 0;
                const char * clipboardData;
                if (NS_SUCCEEDED(GetGlobalData(stm.hGlobal, (void **)&clipboardData, &allocLen)))
                {
                  nsCOMPtr<imgIContainer> container;
                  nsCOMPtr<imgITools> imgTools = do_CreateInstance("@mozilla.org/image/tools;1");
                  nsCOMPtr<nsIInputStream> inputStream;
                  nsresult rv = NS_NewByteInputStream(getter_AddRefs(inputStream),
                                                      clipboardData,
                                                      allocLen,
                                                      NS_ASSIGNMENT_DEPEND);
                  NS_ENSURE_SUCCESS(rv, rv);
                  
                  result = imgTools->DecodeImage(inputStream,
                                                 NS_LITERAL_CSTRING(IMAGE_BMP_MS_CLIPBOARD),
                                                 getter_AddRefs(container));
                  if (NS_FAILED(result)) {
                    break;
                  }

                  nsAutoCString mimeType;
                  if (strcmp(aMIMEImageFormat, kJPGImageMime) == 0) {
                    mimeType.Assign(IMAGE_JPEG);
                  } else {
                    mimeType.Assign(aMIMEImageFormat);
                  }

                  result = imgTools->EncodeImage(container, mimeType, EmptyString(),
                                                 getter_AddRefs(inputStream));
                  if (NS_FAILED(result)) {
                    break;
                  }

                  if (!inputStream) {
                    result = NS_ERROR_FAILURE;
                    break;
                  }

                  *aData = inputStream.forget().take();
                  *aLen = sizeof(nsIInputStream*);
                }
              } break;

            case CF_HDROP : 
              {
                // in the case of a file drop, multiple files are stashed within a
                // single data object. In order to match mozilla's D&D apis, we
                // just pull out the file at the requested index, pretending as
                // if there really are multiple drag items.
                HDROP dropFiles = (HDROP) GlobalLock(stm.hGlobal);

                UINT numFiles = ::DragQueryFileW(dropFiles, 0xFFFFFFFF, nullptr, 0);
                NS_ASSERTION ( numFiles > 0, "File drop flavor, but no files...hmmmm" );
                NS_ASSERTION ( aIndex < numFiles, "Asked for a file index out of range of list" );
                if (numFiles > 0) {
                  UINT fileNameLen = ::DragQueryFileW(dropFiles, aIndex, nullptr, 0);
                  wchar_t* buffer = reinterpret_cast<wchar_t*>(moz_xmalloc((fileNameLen + 1) * sizeof(wchar_t)));
                  if ( buffer ) {
                    ::DragQueryFileW(dropFiles, aIndex, buffer, fileNameLen + 1);
                    *aData = buffer;
                    *aLen = fileNameLen * sizeof(char16_t);
                    result = NS_OK;
                  }
                  else
                    result = NS_ERROR_OUT_OF_MEMORY;
                }
                GlobalUnlock (stm.hGlobal) ;

              } break;

            default: {
              if ( fe.cfFormat == fileDescriptorFlavorA || fe.cfFormat == fileDescriptorFlavorW || fe.cfFormat == fileFlavor ) {
                NS_WARNING ( "Mozilla doesn't yet understand how to read this type of file flavor" );
              } 
              else
              {
                // Get the data out of the global data handle. The size we return
                // should not include the null because the other platforms don't
                // use nulls, so just return the length we get back from strlen(),
                // since we know CF_UNICODETEXT is null terminated. Recall that GetGlobalData() 
                // returns the size of the allocated buffer, not the size of the data 
                // (on 98, these are not the same) so we can't use that.
                //
                // NOTE: we are assuming that anything that falls into this default case
                //        is unicode. As we start to get more kinds of binary data, this
                //        may become an incorrect assumption. Stay tuned.
                uint32_t allocLen = 0;
                if ( NS_SUCCEEDED(GetGlobalData(stm.hGlobal, aData, &allocLen)) ) {
                  if ( fe.cfFormat == CF_HTML ) {
                    // CF_HTML is actually UTF8, not unicode, so disregard the assumption
                    // above. We have to check the header for the actual length, and we'll
                    // do that in FindPlatformHTML(). For now, return the allocLen. This
                    // case is mostly to ensure we don't try to call strlen on the buffer.
                    *aLen = allocLen;
                  } else if (fe.cfFormat == CF_CUSTOMTYPES) {
                    // Binary data
                    *aLen = allocLen;
                  } else if (fe.cfFormat == preferredDropEffect) {
                    // As per the MSDN doc entitled: "Shell Clipboard Formats"
                    // CFSTR_PREFERREDDROPEFFECT should return a DWORD
                    // Reference: http://msdn.microsoft.com/en-us/library/bb776902(v=vs.85).aspx
                    NS_ASSERTION(allocLen == sizeof(DWORD),
                      "CFSTR_PREFERREDDROPEFFECT should return a DWORD");
                    *aLen = allocLen;
                  } else {
                    *aLen = NS_strlen(reinterpret_cast<char16_t*>(*aData)) * 
                            sizeof(char16_t);
                  }
                  result = NS_OK;
                }
              }
            } break;
          } // switch
        } break;

      case TYMED_GDI: 
        {
#ifdef DEBUG
          MOZ_LOG(gWin32ClipboardLog, LogLevel::Info, 
                 ("*********************** TYMED_GDI\n"));
#endif
        } break;

      default:
        break;
    } //switch
    
    ReleaseStgMedium(&stm);
  }

  return result;
}


//-------------------------------------------------------------------------
nsresult nsClipboard::GetDataFromDataObject(IDataObject     * aDataObject,
                                            UINT              anIndex,
                                            nsIWidget       * aWindow,
                                            nsITransferable * aTransferable)
{
  // make sure we have a good transferable
  if ( !aTransferable )
    return NS_ERROR_INVALID_ARG;

  nsresult res = NS_ERROR_FAILURE;

  // get flavor list that includes all flavors that can be written (including ones 
  // obtained through conversion)
  nsCOMPtr<nsIArray> flavorList;
  res = aTransferable->FlavorsTransferableCanImport ( getter_AddRefs(flavorList) );
  if ( NS_FAILED(res) )
    return NS_ERROR_FAILURE;

  // Walk through flavors and see which flavor is on the clipboard them on the native clipboard,
  uint32_t i;
  uint32_t cnt;
  flavorList->GetLength(&cnt);
  for (i=0;i<cnt;i++) {
    nsCOMPtr<nsISupportsCString> currentFlavor = do_QueryElementAt(flavorList, i);
    if ( currentFlavor ) {
      nsXPIDLCString flavorStr;
      currentFlavor->ToString(getter_Copies(flavorStr));
      UINT format = GetFormat(flavorStr);

      // Try to get the data using the desired flavor. This might fail, but all is
      // not lost.
      void* data = nullptr;
      uint32_t dataLen = 0;
      bool dataFound = false;
      if (nullptr != aDataObject) {
        if ( NS_SUCCEEDED(GetNativeDataOffClipboard(aDataObject, anIndex, format, flavorStr, &data, &dataLen)) )
          dataFound = true;
      } 
      else if (nullptr != aWindow) {
        if ( NS_SUCCEEDED(GetNativeDataOffClipboard(aWindow, anIndex, format, &data, &dataLen)) )
          dataFound = true;
      }

      // This is our second chance to try to find some data, having not found it
      // when directly asking for the flavor. Let's try digging around in other
      // flavors to help satisfy our craving for data.
      if ( !dataFound ) {
        if ( strcmp(flavorStr, kUnicodeMime) == 0 )
          dataFound = FindUnicodeFromPlainText ( aDataObject, anIndex, &data, &dataLen );
        else if ( strcmp(flavorStr, kURLMime) == 0 ) {
          // drags from other windows apps expose the native
          // CFSTR_INETURL{A,W} flavor
          dataFound = FindURLFromNativeURL ( aDataObject, anIndex, &data, &dataLen );
          if ( !dataFound )
            dataFound = FindURLFromLocalFile ( aDataObject, anIndex, &data, &dataLen );
        }
      } // if we try one last ditch effort to find our data

      // Hopefully by this point we've found it and can go about our business
      if ( dataFound ) {
        nsCOMPtr<nsISupports> genericDataWrapper;
          if ( strcmp(flavorStr, kFileMime) == 0 ) {
            // we have a file path in |data|. Create an nsLocalFile object.
            nsDependentString filepath(reinterpret_cast<char16_t*>(data));
            nsCOMPtr<nsIFile> file;
            if ( NS_SUCCEEDED(NS_NewLocalFile(filepath, false, getter_AddRefs(file))) )
              genericDataWrapper = do_QueryInterface(file);
            free(data);
          }
        else if ( strcmp(flavorStr, kNativeHTMLMime) == 0 ) {
          uint32_t dummy;
          // the editor folks want CF_HTML exactly as it's on the clipboard, no conversions,
          // no fancy stuff. Pull it off the clipboard, stuff it into a wrapper and hand
          // it back to them.
          if ( FindPlatformHTML(aDataObject, anIndex, &data, &dummy, &dataLen) )
            nsPrimitiveHelpers::CreatePrimitiveForData ( flavorStr, data, dataLen, getter_AddRefs(genericDataWrapper) );
          else
          {
            free(data);
            continue;     // something wrong with this flavor, keep looking for other data
          }
          free(data);
        }
        else if ( strcmp(flavorStr, kHTMLMime) == 0 ) {
          uint32_t startOfData = 0;
          // The JS folks want CF_HTML exactly as it is on the clipboard, but
          // minus the CF_HTML header index information.
          // It also needs to be converted to UTF16 and have linebreaks changed.
          if ( FindPlatformHTML(aDataObject, anIndex, &data, &startOfData, &dataLen) ) {
            dataLen -= startOfData;
            nsPrimitiveHelpers::CreatePrimitiveForCFHTML ( static_cast<char*>(data) + startOfData,
                                                           &dataLen, getter_AddRefs(genericDataWrapper) );
          }
          else
          {
            free(data);
            continue;     // something wrong with this flavor, keep looking for other data
          }
          free(data);
        }
        else if ( strcmp(flavorStr, kJPEGImageMime) == 0 ||
                  strcmp(flavorStr, kJPGImageMime) == 0 ||
                  strcmp(flavorStr, kPNGImageMime) == 0) {
          nsIInputStream * imageStream = reinterpret_cast<nsIInputStream*>(data);
          genericDataWrapper = do_QueryInterface(imageStream);
          NS_IF_RELEASE(imageStream);
        }
        else {
          // Treat custom types as a string of bytes.
          if (strcmp(flavorStr, kCustomTypesMime) != 0) {
            // we probably have some form of text. The DOM only wants LF, so convert from Win32 line 
            // endings to DOM line endings.
            int32_t signedLen = static_cast<int32_t>(dataLen);
            nsLinebreakHelpers::ConvertPlatformToDOMLinebreaks ( flavorStr, &data, &signedLen );
            dataLen = signedLen;

            if (strcmp(flavorStr, kRTFMime) == 0) {
              // RTF on Windows is known to sometimes deliver an extra null byte.
              if (dataLen > 0 && static_cast<char*>(data)[dataLen - 1] == '\0')
                dataLen--;
            }
          }

          nsPrimitiveHelpers::CreatePrimitiveForData ( flavorStr, data, dataLen, getter_AddRefs(genericDataWrapper) );
          free(data);
        }
        
        NS_ASSERTION ( genericDataWrapper, "About to put null data into the transferable" );
        aTransferable->SetTransferData(flavorStr, genericDataWrapper, dataLen);
        res = NS_OK;

        // we found one, get out of the loop
        break;
      }

    }
  } // foreach flavor

  return res;

}



//
// FindPlatformHTML
//
// Someone asked for the OS CF_HTML flavor. We give it back to them exactly as-is.
//
bool
nsClipboard :: FindPlatformHTML ( IDataObject* inDataObject, UINT inIndex,
                                  void** outData, uint32_t* outStartOfData,
                                  uint32_t* outDataLen )
{
  // Reference: MSDN doc entitled "HTML Clipboard Format"
  // http://msdn.microsoft.com/en-us/library/aa767917(VS.85).aspx#unknown_854
  // CF_HTML is UTF8, not unicode. We also can't rely on it being null-terminated
  // so we have to check the CF_HTML header for the correct length. 
  // The length we return is the bytecount from the beginning of the selected data to the end
  // of the selected data, without the null termination. Because it's UTF8, we're guaranteed 
  // the header is ASCII.

  if (!outData || !*outData) {
    return false;
  }

  char version[8] = { 0 };
  int32_t startOfData = 0;
  int32_t endOfData = 0;
  int numFound = sscanf((char*)*outData, "Version:%7s\nStartHTML:%d\nEndHTML:%d", 
                        version, &startOfData, &endOfData);

  if (numFound != 3 || startOfData < -1 || endOfData < -1) {
    return false;
  }

  // Fixup the start and end markers if they have no context (set to -1)
  if (startOfData == -1) {
    startOfData = 0;
  }
  if (endOfData == -1) {
    endOfData = *outDataLen;
  }

  // Make sure we were passed sane values within our buffer size.
  // (Note that we've handled all cases of negative endOfData above, so we can
  // safely cast it to be unsigned here.)
  if (!endOfData || startOfData >= endOfData || 
      static_cast<uint32_t>(endOfData) > *outDataLen) {
    return false;
  }
  
  // We want to return the buffer not offset by startOfData because it will be 
  // parsed out later (probably by HTMLEditor::ParseCFHTML) when it is still
  // in CF_HTML format.

  // We return the byte offset from the start of the data buffer to where the
  // HTML data starts. The caller might want to extract the HTML only.
  *outStartOfData = startOfData;
  *outDataLen = endOfData;
  return true;
}


//
// FindUnicodeFromPlainText
//
// we are looking for text/unicode and we failed to find it on the clipboard first,
// try again with text/plain. If that is present, convert it to unicode.
//
bool
nsClipboard :: FindUnicodeFromPlainText ( IDataObject* inDataObject, UINT inIndex, void** outData, uint32_t* outDataLen )
{
  // we are looking for text/unicode and we failed to find it on the clipboard first,
  // try again with text/plain. If that is present, convert it to unicode.
  nsresult rv = GetNativeDataOffClipboard(inDataObject, inIndex, GetFormat(kTextMime), nullptr, outData, outDataLen);
  if (NS_FAILED(rv) || !*outData) {
    return false;
  }

  const char* castedText = static_cast<char*>(*outData);
  nsAutoString tmp;
  rv = NS_CopyNativeToUnicode(nsDependentCSubstring(castedText, *outDataLen), tmp);
  if (NS_FAILED(rv)) {
    return false;
  }

  // out with the old, in with the new
  free(*outData);
  *outData = ToNewUnicode(tmp);
  *outDataLen = tmp.Length() * sizeof(char16_t);

  return true;

} // FindUnicodeFromPlainText


//
// FindURLFromLocalFile
//
// we are looking for a URL and couldn't find it, try again with looking for 
// a local file. If we have one, it may either be a normal file or an internet shortcut.
// In both cases, however, we can get a URL (it will be a file:// url in the
// local file case).
//
bool
nsClipboard :: FindURLFromLocalFile ( IDataObject* inDataObject, UINT inIndex, void** outData, uint32_t* outDataLen )
{
  bool dataFound = false;

  nsresult loadResult = GetNativeDataOffClipboard(inDataObject, inIndex, GetFormat(kFileMime), nullptr, outData, outDataLen);
  if ( NS_SUCCEEDED(loadResult) && *outData ) {
    // we have a file path in |data|. Is it an internet shortcut or a normal file?
    const nsDependentString filepath(static_cast<char16_t*>(*outData));
    nsCOMPtr<nsIFile> file;
    nsresult rv = NS_NewLocalFile(filepath, true, getter_AddRefs(file));
    if (NS_FAILED(rv)) {
      free(*outData);
      return dataFound;
    }

    if ( IsInternetShortcut(filepath) ) {
      free(*outData);
      nsAutoCString url;
      ResolveShortcut( file, url );
      if ( !url.IsEmpty() ) {
        // convert it to unicode and pass it out
        NS_ConvertUTF8toUTF16 urlString(url);
        // the internal mozilla URL format, text/x-moz-url, contains
        // URL\ntitle.  We can guess the title from the file's name.
        nsAutoString title;
        file->GetLeafName(title);
        // We rely on IsInternetShortcut check that file has a .url extension.
        title.SetLength(title.Length() - 4);
        if (title.IsEmpty())
          title = urlString;
        *outData = ToNewUnicode(urlString + NS_LITERAL_STRING("\n") + title);
        *outDataLen = NS_strlen(static_cast<char16_t*>(*outData)) * sizeof(char16_t);

        dataFound = true;
      }
    }
    else {
      // we have a normal file, use some Necko objects to get our file path
      nsAutoCString urlSpec;
      NS_GetURLSpecFromFile(file, urlSpec);

      // convert it to unicode and pass it out
      free(*outData);
      *outData = UTF8ToNewUnicode(urlSpec);
      *outDataLen = NS_strlen(static_cast<char16_t*>(*outData)) * sizeof(char16_t);
      dataFound = true;
    } // else regular file
  }

  return dataFound;
} // FindURLFromLocalFile

//
// FindURLFromNativeURL
//
// we are looking for a URL and couldn't find it using our internal
// URL flavor, so look for it using the native URL flavor,
// CF_INETURLSTRW (We don't handle CF_INETURLSTRA currently)
//
bool
nsClipboard :: FindURLFromNativeURL ( IDataObject* inDataObject, UINT inIndex, void** outData, uint32_t* outDataLen )
{
  bool dataFound = false;

  void* tempOutData = nullptr;
  uint32_t tempDataLen = 0;

  nsresult loadResult = GetNativeDataOffClipboard(inDataObject, inIndex, ::RegisterClipboardFormat(CFSTR_INETURLW), nullptr, &tempOutData, &tempDataLen);
  if ( NS_SUCCEEDED(loadResult) && tempOutData ) {
    nsDependentString urlString(static_cast<char16_t*>(tempOutData));
    // the internal mozilla URL format, text/x-moz-url, contains
    // URL\ntitle.  Since we don't actually have a title here,
    // just repeat the URL to fake it.
    *outData = ToNewUnicode(urlString + NS_LITERAL_STRING("\n") + urlString);
    *outDataLen = NS_strlen(static_cast<char16_t*>(*outData)) * sizeof(char16_t);
    free(tempOutData);
    dataFound = true;
  }
  else {
    loadResult = GetNativeDataOffClipboard(inDataObject, inIndex, ::RegisterClipboardFormat(CFSTR_INETURLA), nullptr, &tempOutData, &tempDataLen);
    if ( NS_SUCCEEDED(loadResult) && tempOutData ) {
      // CFSTR_INETURLA is (currently) equal to CFSTR_SHELLURL which is equal to CF_TEXT
      // which is by definition ANSI encoded.
      nsCString urlUnescapedA;
      bool unescaped = NS_UnescapeURL(static_cast<char*>(tempOutData), tempDataLen, esc_OnlyNonASCII | esc_SkipControl, urlUnescapedA);

      nsString urlString;
      if (unescaped)
        NS_CopyNativeToUnicode(urlUnescapedA, urlString);
      else
        NS_CopyNativeToUnicode(nsDependentCString(static_cast<char*>(tempOutData), tempDataLen), urlString);

      // the internal mozilla URL format, text/x-moz-url, contains
      // URL\ntitle.  Since we don't actually have a title here,
      // just repeat the URL to fake it.
      *outData = ToNewUnicode(urlString + NS_LITERAL_STRING("\n") + urlString);
      *outDataLen = NS_strlen(static_cast<char16_t*>(*outData)) * sizeof(char16_t);
      free(tempOutData);
      dataFound = true;
    }
  }

  return dataFound;
} // FindURLFromNativeURL

//
// ResolveShortcut
//
void
nsClipboard :: ResolveShortcut ( nsIFile* aFile, nsACString& outURL )
{
  nsCOMPtr<nsIFileProtocolHandler> fph;
  nsresult rv = NS_GetFileProtocolHandler(getter_AddRefs(fph));
  if (NS_FAILED(rv))
    return;

  nsCOMPtr<nsIURI> uri;
  rv = fph->ReadURLFile(aFile, getter_AddRefs(uri));
  if (NS_FAILED(rv))
    return;

  uri->GetSpec(outURL);
} // ResolveShortcut


//
// IsInternetShortcut
//
// A file is an Internet Shortcut if it ends with .URL
//
bool
nsClipboard :: IsInternetShortcut ( const nsAString& inFileName ) 
{
  return StringEndsWith(inFileName, NS_LITERAL_STRING(".url"), nsCaseInsensitiveStringComparator());
} // IsInternetShortcut


//-------------------------------------------------------------------------
NS_IMETHODIMP 
nsClipboard::GetNativeClipboardData ( nsITransferable * aTransferable, int32_t aWhichClipboard )
{
  // make sure we have a good transferable
  if ( !aTransferable || aWhichClipboard != kGlobalClipboard )
    return NS_ERROR_FAILURE;

  nsresult res;

  // This makes sure we can use the OLE functionality for the clipboard
  IDataObject * dataObj;
  if (S_OK == ::OleGetClipboard(&dataObj)) {
    // Use OLE IDataObject for clipboard operations
    res = GetDataFromDataObject(dataObj, 0, nullptr, aTransferable);
    dataObj->Release();
  } 
  else {
    // do it the old manual way
    res = GetDataFromDataObject(nullptr, 0, mWindow, aTransferable);
  }
  return res;

}

NS_IMETHODIMP
nsClipboard::EmptyClipboard(int32_t aWhichClipboard)
{
  // Some programs such as ZoneAlarm monitor clipboard usage and then open the
  // clipboard to scan it.  If we i) empty and then ii) set data, then the
  // 'set data' can sometimes fail with access denied becacuse another program
  // has the clipboard open.  So to avoid this race condition for OpenClipboard
  // we do not empty the clipboard when we're setting it.
  if (aWhichClipboard == kGlobalClipboard && !mEmptyingForSetData) {
    OleSetClipboard(nullptr);
  }
  return nsBaseClipboard::EmptyClipboard(aWhichClipboard);
}

//-------------------------------------------------------------------------
NS_IMETHODIMP nsClipboard::HasDataMatchingFlavors(const char** aFlavorList,
                                                  uint32_t aLength,
                                                  int32_t aWhichClipboard,
                                                  bool *_retval)
{
  *_retval = false;
  if (aWhichClipboard != kGlobalClipboard || !aFlavorList)
    return NS_OK;

  for (uint32_t i = 0;i < aLength; ++i) {
#ifdef DEBUG
    if (strcmp(aFlavorList[i], kTextMime) == 0)
      NS_WARNING ( "DO NOT USE THE text/plain DATA FLAVOR ANY MORE. USE text/unicode INSTEAD" );
#endif

    UINT format = GetFormat(aFlavorList[i]);
    if (IsClipboardFormatAvailable(format)) {
      *_retval = true;
      break;
    }
    else {
      // We haven't found the exact flavor the client asked for, but maybe we can
      // still find it from something else that's on the clipboard...
      if (strcmp(aFlavorList[i], kUnicodeMime) == 0) {
        // client asked for unicode and it wasn't present, check if we have CF_TEXT.
        // We'll handle the actual data substitution in the data object.
        if (IsClipboardFormatAvailable(GetFormat(kTextMime)))
          *_retval = true;
      }
    }
  }

  return NS_OK;
}