aboutsummaryrefslogtreecommitdiffstats
path: root/Medley/src/lib/TntUnicodeControls/TntSystem.pas
blob: e613ce0c02f7ca00692742e4ecfa71ef2c32367e (plain) (blame)
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
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
{*****************************************************************************}
{                                                                             }
{    Tnt Delphi Unicode Controls                                              }
{      http://www.tntware.com/delphicontrols/unicode/                         }
{        Version: 2.3.0                                                       }
{                                                                             }
{    Copyright (c) 2002-2007, Troy Wolbrink (troy.wolbrink@tntware.com)       }
{                                                                             }
{*****************************************************************************}

unit TntSystem;

{$IFDEF FPC}
  {$MODE Delphi}
{$ENDIF}

{$INCLUDE TntCompilers.inc}

{*****************************************************************************}
{  Special thanks go to Francisco Leong for originating the design for        }
{    WideString-enabled resourcestrings.                                      }
{*****************************************************************************}

interface

uses
  Windows;

// These functions should not be used by Delphi code since conversions are implicit.
{TNT-WARN WideCharToString}
{TNT-WARN WideCharLenToString}
{TNT-WARN WideCharToStrVar}
{TNT-WARN WideCharLenToStrVar}
{TNT-WARN StringToWideChar}

// ................ ANSI TYPES ................
{TNT-WARN Char}
{TNT-WARN PChar}
{TNT-WARN String}

{TNT-WARN CP_ACP} // <-- use DefaultSystemCodePage
function DefaultSystemCodePage: Cardinal; // implicitly used when converting AnsiString <--> WideString.

{$IFNDEF FPC}
var
  WideCustomLoadResString: function(ResStringRec: PResStringRec; var Value: WideString): Boolean;
{$ENDIF}

{TNT-WARN LoadResString}
function WideLoadResString(ResStringRec: PResStringRec): WideString;
{TNT-WARN ParamCount}
function WideParamCount: Integer;
{TNT-WARN ParamStr}
function WideParamStr(Index: Integer): WideString;

// ......... introduced .........

const
  { Each Unicode stream should begin with the code U+FEFF,  }
  {   which the standard defines as the *byte order mark*.  }
  UNICODE_BOM = WideChar($FEFF);
  UNICODE_BOM_SWAPPED = WideChar($FFFE);
  UTF8_BOM = AnsiString(#$EF#$BB#$BF);

function WideStringToUTF8(const S: WideString): AnsiString;
function UTF8ToWideString(const S: AnsiString): WideString;

function WideStringToUTF7(const W: WideString): AnsiString;
function UTF7ToWideString(const S: AnsiString): WideString;

function StringToWideStringEx(const S: AnsiString; CodePage: Cardinal): WideString;
function WideStringToStringEx(const WS: WideString; CodePage: Cardinal): AnsiString;

function UCS2ToWideString(const Value: AnsiString): WideString;
function WideStringToUCS2(const Value: WideString): AnsiString;

function CharSetToCodePage(ciCharset: UINT): Cardinal;
function LCIDToCodePage(ALcid: LCID): Cardinal;
function KeyboardCodePage: Cardinal;
function KeyUnicode(CharCode: Word): WideChar;

procedure StrSwapByteOrder(Str: PWideChar);

{$IFDEF USE_SYSTEM_OVERRIDES}

type
  TTntSystemUpdate =
    (tsWideResourceStrings
     {$IFNDEF COMPILER_9_UP}, tsFixImplicitCodePage, tsFixWideStrConcat, tsFixWideFormat {$ENDIF}
    );
  TTntSystemUpdateSet = set of TTntSystemUpdate;

const
  AllTntSystemUpdates = [Low(TTntSystemUpdate)..High(TTntSystemUpdate)];

procedure InstallTntSystemUpdates(Updates: TTntSystemUpdateSet = AllTntSystemUpdates);

{$ENDIF USE_SYSTEM_OVERRIDES}

implementation

uses
  SysUtils, Variants, TntWindows, TntSysUtils;

var
  GDefaultSystemCodePage: Cardinal;

function DefaultSystemCodePage: Cardinal;
begin
  Result := GDefaultSystemCodePage;
end;

{$IFDEF USE_SYSTEM_OVERRIDES}
var
  IsDebugging: Boolean;
{$ENDIF USE_SYSTEM_OVERRIDES}

function WideLoadResStringDetect(ResStringRec: PResStringRec): WideString;
var
  PCustom: PAnsiChar;
begin
  // custom string pointer
  PCustom := PAnsiChar(ResStringRec); { I would like to use PWideChar, but this would break legacy code. }
  if  (StrLen{TNT-ALLOW StrLen}(PCustom) > Cardinal(Length(UTF8_BOM)))
  and CompareMem(PCustom, PAnsiChar(UTF8_BOM), Length(UTF8_BOM)) then
    // detected UTF8
    Result := UTF8ToWideString(PAnsiChar(PCustom + Length(UTF8_BOM)))
  else
    // normal
    Result := PCustom;
end;

{$IFNDEF FPC}

function WideLoadResString(ResStringRec: PResStringRec): WideString;
const
  MAX_RES_STRING_SIZE = 4097; { MSDN documents this as the maximum size of a string in table. }
var
  Buffer: array [0..MAX_RES_STRING_SIZE] of WideChar; { Buffer leaves room for null terminator. }
begin
  if Assigned(WideCustomLoadResString) and WideCustomLoadResString(ResStringRec, Result) then
    exit; { a custom resourcestring has been loaded. }

  if ResStringRec = nil then
    Result := ''
  else if ResStringRec.Identifier < 64*1024 then
    SetString(Result, Buffer,
      Tnt_LoadStringW(FindResourceHInstance(ResStringRec.Module^),
        ResStringRec.Identifier, Buffer, MAX_RES_STRING_SIZE))
  else begin
    Result := WideLoadResStringDetect(ResStringRec);
  end;
end;

{$ELSE}

function WideLoadResString(ResStringRec: PResStringRec): WideString;
begin
  Result := WideLoadResStringDetect(ResStringRec);
end;

{$ENDIF}

function WideGetParamStr(P: PWideChar; var Param: WideString): PWideChar;
var
  i, Len: Integer;
  Start, S, Q: PWideChar;
begin
  while True do
  begin
    while (P[0] <> #0) and (P[0] <= ' ') do
      Inc(P);
    if (P[0] = '"') and (P[1] = '"') then Inc(P, 2) else Break;
  end;
  Len := 0;
  Start := P;
  while P[0] > ' ' do
  begin
    if P[0] = '"' then
    begin
      Inc(P);
      while (P[0] <> #0) and (P[0] <> '"') do
      begin
        Q := P + 1;
        Inc(Len, Q - P);
        P := Q;
      end;
      if P[0] <> #0 then
        Inc(P);
    end
    else
    begin
      Q := P + 1;
      Inc(Len, Q - P);
      P := Q;
    end;
  end;

  SetLength(Param, Len);

  P := Start;
  S := PWideChar(Param);
  i := 0;
  while P[0] > ' ' do
  begin
    if P[0] = '"' then
    begin
      Inc(P);
      while (P[0] <> #0) and (P[0] <> '"') do
      begin
        Q := P + 1;
        while P < Q do
        begin
          S[i] := P^;
          Inc(P);
          Inc(i);
        end;
      end;
      if P[0] <> #0 then Inc(P);
    end
    else
    begin
      Q := P + 1;
      while P < Q do
      begin
        S[i] := P^;
        Inc(P);
        Inc(i);
      end;
    end;
  end;

  Result := P;
end;

function WideParamCount: Integer;
var
  P: PWideChar;
  S: WideString;
begin
  P := WideGetParamStr(GetCommandLineW, S);
  Result := 0;
  while True do
  begin
    P := WideGetParamStr(P, S);
    if S = '' then Break;
    Inc(Result);
  end;
end;

function WideParamStr(Index: Integer): WideString;
var
  P: PWideChar;
begin
  if Index = 0 then
    Result := WideGetModuleFileName(0)
  else
  begin
    P := GetCommandLineW;
    while True do
    begin
      P := WideGetParamStr(P, Result);
      if (Index = 0) or (Result = '') then Break;
      Dec(Index);
    end;
  end;
end;

function WideStringToUTF8(const S: WideString): AnsiString;
begin
  Result := UTF8Encode(S);
end;

function UTF8ToWideString(const S: AnsiString): WideString;
begin
  Result := UTF8Decode(S);
end;

  { ======================================================================= }
  { Original File:   ConvertUTF7.c                                          }
  { Author: David B. Goldsmith                                              }
  { Copyright (C) 1994, 1996 Taligent, Inc. All rights reserved.            }
  {                                                                         }
  { This code is copyrighted. Under the copyright laws, this code may not   }
  { be copied, in whole or part, without prior written consent of Taligent. }
  {                                                                         }
  { Taligent grants the right to use this code as long as this ENTIRE       }
  { copyright notice is reproduced in the code.  The code is provided       }
  { AS-IS, AND TALIGENT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR         }
  { IMPLIED, INCLUDING, BUT NOT LIMITED TO IMPLIED WARRANTIES OF            }
  { MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT      }
  { WILL TALIGENT BE LIABLE FOR ANY DAMAGES WHATSOEVER (INCLUDING,          }
  { WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS, BUSINESS      }
  { INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY          }
  { LOSS) ARISING OUT OF THE USE OR INABILITY TO USE THIS CODE, EVEN        }
  { IF TALIGENT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.        }
  { BECAUSE SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF         }
  { LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, THE ABOVE            }
  { LIMITATION MAY NOT APPLY TO YOU.                                        }
  {                                                                         }
  { RESTRICTED RIGHTS LEGEND: Use, duplication, or disclosure by the        }
  { government is subject to restrictions as set forth in subparagraph      }
  { (c)(l)(ii) of the Rights in Technical Data and Computer Software        }
  { clause at DFARS 252.227-7013 and FAR 52.227-19.                         }
  {                                                                         }
  { This code may be protected by one or more U.S. and International        }
  { Patents.                                                                }
  {                                                                         }
  { TRADEMARKS: Taligent and the Taligent Design Mark are registered        }
  { trademarks of Taligent, Inc.                                            }
  { ======================================================================= }

type UCS2 = Word;

const
  _base64: AnsiString = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  _direct: AnsiString = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789''(),-./:?';
  _optional: AnsiString = '!"#$%&*;<=>@[]^_`{|}';
  _spaces: AnsiString = #9#13#10#32;

var
  base64: PAnsiChar;
  invbase64: array[0..127] of SmallInt;
  direct: PAnsiChar;
  optional: PAnsiChar;
  spaces: PAnsiChar;
  mustshiftsafe: array[0..127] of AnsiChar;
  mustshiftopt: array[0..127] of AnsiChar;

var
  needtables: Boolean = True;

procedure Initialize_UTF7_Data;
begin
  base64 := PAnsiChar(_base64);
  direct := PAnsiChar(_direct);
  optional := PAnsiChar(_optional);
  spaces := PAnsiChar(_spaces);
end;

procedure tabinit;
var
  i: Integer;
  limit: Integer;
begin
  i := 0;
  while (i < 128) do
  begin
    mustshiftopt[i] := #1;
    mustshiftsafe[i] := #1;
    invbase64[i] := -1;
    Inc(i);
  end { For };
  limit := Length(_Direct);
  i := 0;
  while (i < limit) do
  begin
    mustshiftopt[Integer(direct[i])] := #0;
    mustshiftsafe[Integer(direct[i])] := #0;
    Inc(i);
  end { For };
  limit := Length(_Spaces);
  i := 0;
  while (i < limit) do
  begin
    mustshiftopt[Integer(spaces[i])] := #0;
    mustshiftsafe[Integer(spaces[i])] := #0;
    Inc(i);
  end { For };
  limit := Length(_Optional);
  i := 0;
  while (i < limit) do
  begin
    mustshiftopt[Integer(optional[i])] := #0;
    Inc(i);
  end { For };
  limit := Length(_Base64);
  i := 0;
  while (i < limit) do
  begin
    invbase64[Integer(base64[i])] := i;
    Inc(i);
  end { For };
  needtables := False;
end; { tabinit }

function WRITE_N_BITS(x: UCS2; n: Integer; var BITbuffer: Cardinal; var bufferbits: Integer): Integer;
begin
  BITbuffer := BITbuffer or (x and (not (-1 shl n))) shl (32 - n - bufferbits);
  bufferbits := bufferbits + n;
  Result := bufferbits;
end; { WRITE_N_BITS }

function READ_N_BITS(n: Integer; var BITbuffer: Cardinal; var bufferbits: Integer): UCS2;
var
  buffertemp: Cardinal;
begin
  buffertemp := BITbuffer shr (32 - n);
  BITbuffer := BITbuffer shl n;
  bufferbits := bufferbits - n;
  Result := UCS2(buffertemp);
end; { READ_N_BITS }

function ConvertUCS2toUTF7(var sourceStart: PWideChar; sourceEnd: PWideChar;
  var targetStart: PAnsiChar; targetEnd: PAnsiChar; optional: Boolean;
    verbose: Boolean): Integer;
var
  r: UCS2;
  target: PAnsiChar;
  source: PWideChar;
  BITbuffer: Cardinal;
  bufferbits: Integer;
  shifted: Boolean;
  needshift: Boolean;
  done: Boolean;
  mustshift: PAnsiChar;
begin
  Initialize_UTF7_Data;
  Result := 0;
  BITbuffer := 0;
  bufferbits := 0;
  shifted := False;
  source := sourceStart;
  target := targetStart;
  r := 0;
  if needtables then
    tabinit;
  if optional then
    mustshift := @mustshiftopt[0]
  else
    mustshift := @mustshiftsafe[0];
  repeat
    done := source >= sourceEnd;
    if not Done then
    begin
      r := Word(source^);
      Inc(Source);
    end { If };
    needshift := (not done) and ((r > $7F) or (mustshift[r] <> #0));
    if needshift and (not shifted) then
    begin
      if (Target >= TargetEnd) then
      begin
        Result := 2;
        break;
      end { If };
      target^ := '+';
      Inc(target);
      { Special case handling of the SHIFT_IN character }
      if (r = UCS2('+')) then
      begin
        if (target >= targetEnd) then
        begin
          Result := 2;
          break;
        end;
        target^ := '-';
        Inc(target);
      end
      else
        shifted := True;
    end { If };
    if shifted then
    begin
      { Either write the character to the bit buffer, or pad }
      { the bit buffer out to a full base64 character. }
      { }
      if needshift then
        WRITE_N_BITS(r, 16, BITbuffer, bufferbits)
      else
        WRITE_N_BITS(0, (6 - (bufferbits mod 6)) mod 6, BITbuffer,
          bufferbits);
      { Flush out as many full base64 characters as possible }
      { from the bit buffer. }
      { }
      while (target < targetEnd) and (bufferbits >= 6) do
      begin
        Target^ := base64[READ_N_BITS(6, BITbuffer, bufferbits)];
        Inc(Target);
      end { While };
      if (bufferbits >= 6) then
      begin
        if (target >= targetEnd) then
        begin
          Result := 2;
          break;
        end { If };
      end { If };
      if (not needshift) then
      begin
        { Write the explicit shift out character if }
        { 1) The caller has requested we always do it, or }
        { 2) The directly encoded character is in the }
        { base64 set, or }
        { 3) The directly encoded character is SHIFT_OUT. }
        { }
        if verbose or ((not done) and ((invbase64[r] >= 0) or (r =
          Integer('-')))) then
        begin
          if (target >= targetEnd) then
          begin
            Result := 2;
            Break;
          end { If };
          Target^ := '-';
          Inc(Target);
        end { If };
        shifted := False;
      end { If };
      { The character can be directly encoded as ASCII. }
    end { If };
    if (not needshift) and (not done) then
    begin
      if (target >= targetEnd) then
      begin
        Result := 2;
        break;
      end { If };
      Target^ := AnsiChar(r);
      Inc(Target);
    end { If };
  until (done);
  sourceStart := source;
  targetStart := target;
end; { ConvertUCS2toUTF7 }

function ConvertUTF7toUCS2(var sourceStart: PAnsiChar; sourceEnd: PAnsiChar;
  var targetStart: PWideChar; targetEnd: PWideChar): Integer;
var
  target: PWideChar { Register };
  source: PAnsiChar { Register };
  BITbuffer: Cardinal { & "Address Of" Used };
  bufferbits: Integer { & "Address Of" Used };
  shifted: Boolean { Used In Boolean Context };
  first: Boolean { Used In Boolean Context };
  wroteone: Boolean;
  base64EOF: Boolean;
  base64value: Integer;
  done: Boolean;
  c: UCS2;
  prevc: UCS2;
  junk: UCS2 { Used In Boolean Context };
begin
  Initialize_UTF7_Data;
  Result := 0;
  BITbuffer := 0;
  bufferbits := 0;
  shifted := False;
  first := False;
  wroteone := False;
  source := sourceStart;
  target := targetStart;
  c := 0;
  if needtables then
    tabinit;
  repeat
    { read an ASCII character c }
    done := Source >= SourceEnd;
    if (not done) then
    begin
      c := Word(Source^);
      Inc(Source);
    end { If };
    if shifted then
    begin
      { We're done with a base64 string if we hit EOF, it's not a valid }
      { ASCII character, or it's not in the base64 set. }
      { }
      base64value := invbase64[c];
      base64EOF := (done or (c > $7F)) or (base64value < 0);
      if base64EOF then
      begin
        shifted := False;
        { If the character causing us to drop out was SHIFT_IN or }
        { SHIFT_OUT, it may be a special escape for SHIFT_IN. The }
        { test for SHIFT_IN is not necessary, but allows an alternate }
        { form of UTF-7 where SHIFT_IN is escaped by SHIFT_IN. This }
        { only works for some values of SHIFT_IN. }
        { }
        if ((not done) and ((c = Integer('+')) or (c = Integer('-')))) then
        begin
          { get another character c }
          prevc := c;
          Done := Source >= SourceEnd;
          if (not Done) then
          begin
            c := Word(Source^);
            Inc(Source);
            { If no base64 characters were encountered, and the }
            { character terminating the shift sequence was }
            { SHIFT_OUT, then it's a special escape for SHIFT_IN. }
            { }
          end;
          if first and (prevc = Integer('-')) then
          begin
            { write SHIFT_IN unicode }
            if (target >= targetEnd) then
            begin
              Result := 2;
              break;
            end { If };
            Target^ := WideChar('+');
            Inc(Target);
          end
          else
          begin
            if (not wroteone) then
            begin
              Result := 1;
            end { If };
          end { Else };
          ;
        end { If }
        else
        begin
          if (not wroteone) then
          begin
            Result := 1;
          end { If };
        end { Else };
      end { If }
      else
      begin
        { Add another 6 bits of base64 to the bit buffer. }
        WRITE_N_BITS(base64value, 6, BITbuffer,
          bufferbits);
        first := False;
      end { Else };
      { Extract as many full 16 bit characters as possible from the }
      { bit buffer. }
      { }
      while (bufferbits >= 16) and (target < targetEnd) do
      begin
        { write a unicode }
        Target^ := WideChar(READ_N_BITS(16, BITbuffer, bufferbits));
        Inc(Target);
        wroteone := True;
      end { While };
      if (bufferbits >= 16) then
      begin
        if (target >= targetEnd) then
        begin
          Result := 2;
          Break;
        end;
      end { If };
      if (base64EOF) then
      begin
        junk := READ_N_BITS(bufferbits, BITbuffer, bufferbits);
        if (junk <> 0) then
        begin
          Result := 1;
        end { If };
      end { If };
    end { If };
    if (not shifted) and (not done) then
    begin
      if (c = Integer('+')) then
      begin
        shifted := True;
        first := True;
        wroteone := False;
      end { If }
      else
      begin
        { It must be a directly encoded character. }
        if (c > $7F) then
        begin
          Result := 1;
        end { If };
        if (target >= targetEnd) then
        begin
          Result := 2;
          break;
        end { If };
        Target^ := WideChar(c);
        Inc(Target);
      end { Else };
    end { If };
  until (done);
  sourceStart := source;
  targetStart := target;
end; { ConvertUTF7toUCS2 }

  {*****************************************************************************}
  { Thanks to Francisco Leong for providing the Pascal conversion of            }
  {   ConvertUTF7.c (by David B. Goldsmith)                                     }
  {*****************************************************************************}

resourcestring
  SBufferOverflow = 'Buffer overflow';
  SInvalidUTF7 = 'Invalid UTF7';

function WideStringToUTF7(const W: WideString): AnsiString;
var
  SourceStart, SourceEnd: PWideChar;
  TargetStart, TargetEnd: PAnsiChar;
begin
  if W = '' then
    Result := ''
  else
  begin
    SetLength(Result, Length(W) * 7); // Assume worst case
    SourceStart := PWideChar(@W[1]);
    SourceEnd := PWideChar(@W[Length(W)]) + 1;
    TargetStart := PAnsiChar(@Result[1]);
    TargetEnd := PAnsiChar(@Result[Length(Result)]) + 1;
    if ConvertUCS2toUTF7(SourceStart, SourceEnd, TargetStart,
      TargetEnd, True, False) <> 0
    then
      raise ETntInternalError.Create(SBufferOverflow);
    SetLength(Result, TargetStart - PAnsiChar(@Result[1]));
  end;
end;

function UTF7ToWideString(const S: AnsiString): WideString;
var
  SourceStart, SourceEnd: PAnsiChar;
  TargetStart, TargetEnd: PWideChar;
begin
  if (S = '') then
    Result := ''
  else
  begin
    SetLength(Result, Length(S)); // Assume Worst case
    SourceStart := PAnsiChar(@S[1]);
    SourceEnd := PAnsiChar(@S[Length(S)]) + 1;
    TargetStart := PWideChar(@Result[1]);
    TargetEnd := PWideChar(@Result[Length(Result)]) + 1;
    case ConvertUTF7toUCS2(SourceStart, SourceEnd, TargetStart,
      TargetEnd) of
      1: raise ETntGeneralError.Create(SInvalidUTF7);
      2: raise ETntInternalError.Create(SBufferOverflow);
    end;
    SetLength(Result, TargetStart - PWideChar(@Result[1]));
  end;
end;

function StringToWideStringEx(const S: AnsiString; CodePage: Cardinal): WideString;
var
  InputLength,
  OutputLength: Integer;
begin
  if CodePage = CP_UTF7 then
    Result := UTF7ToWideString(S) // CP_UTF7 not supported on Windows 95
  else if CodePage = CP_UTF8 then
    Result := UTF8ToWideString(S) // CP_UTF8 not supported on Windows 95
  else begin
    InputLength := Length(S);
    OutputLength := MultiByteToWideChar(CodePage, 0, PAnsiChar(S), InputLength, nil, 0);
    SetLength(Result, OutputLength);
    MultiByteToWideChar(CodePage, 0, PAnsiChar(S), InputLength, PWideChar(Result), OutputLength);
  end;
end;

function WideStringToStringEx(const WS: WideString; CodePage: Cardinal): AnsiString;
var
  InputLength,
  OutputLength: Integer;
begin
  if CodePage = CP_UTF7 then
    Result := WideStringToUTF7(WS) // CP_UTF7 not supported on Windows 95
  else if CodePage = CP_UTF8 then
    Result := WideStringToUTF8(WS) // CP_UTF8 not supported on Windows 95
  else begin
    InputLength := Length(WS);
    OutputLength := WideCharToMultiByte(CodePage, 0, PWideChar(WS), InputLength, nil, 0, nil, nil);
    SetLength(Result, OutputLength);
    WideCharToMultiByte(CodePage, 0, PWideChar(WS), InputLength, PAnsiChar(Result), OutputLength, nil, nil);
  end;
end;

function UCS2ToWideString(const Value: AnsiString): WideString;
begin
  if Length(Value) = 0 then
    Result := ''
  else
    SetString(Result, PWideChar(@Value[1]), Length(Value) div SizeOf(WideChar))
end;

function WideStringToUCS2(const Value: WideString): AnsiString;
begin
  if Length(Value) = 0 then
    Result := ''
  else
    SetString(Result, PAnsiChar(@Value[1]), Length(Value) * SizeOf(WideChar))
end;

{ Windows.pas doesn't declare TranslateCharsetInfo() correctly. }
function TranslateCharsetInfo(lpSrc: PDWORD; var lpCs: TCharsetInfo; dwFlags: DWORD): BOOL; stdcall; external gdi32 name 'TranslateCharsetInfo';

function CharSetToCodePage(ciCharset: UINT): Cardinal;
var
  C: TCharsetInfo;
begin
  Win32Check(TranslateCharsetInfo(PDWORD(ciCharset), C, TCI_SRCCHARSET));
  Result := C.ciACP
end;

function LCIDToCodePage(ALcid: LCID): Cardinal;
var
  Buf: array[0..6] of AnsiChar;
begin
  GetLocaleInfo(ALcid, LOCALE_IDefaultAnsiCodePage, Buf, 6);
  Result := StrToIntDef(Buf, GetACP);
end;

function KeyboardCodePage: Cardinal;
begin
  Result := LCIDToCodePage(GetKeyboardLayout(0) and $FFFF);
end;

function KeyUnicode(CharCode: Word): WideChar;
var
  AChar: AnsiChar;
begin
  // converts the given character (as it comes with a WM_CHAR message) into its
  // corresponding Unicode character depending on the active keyboard layout
  if CharCode <= Word(High(AnsiChar)) then begin
    AChar := AnsiChar(CharCode);
    MultiByteToWideChar(KeyboardCodePage, MB_USEGLYPHCHARS, @AChar, 1, @Result, 1);
  end else
    Result := WideChar(CharCode);
end;

procedure StrSwapByteOrder(Str: PWideChar);
var
  P: PWord;
begin
  P := PWord(Str);
  While (P^ <> 0) do begin
    P^ := MakeWord(HiByte(P^), LoByte(P^));
    Inc(P);
  end;
end;

{$IFDEF USE_SYSTEM_OVERRIDES}

//--------------------------------------------------------------------
//                LoadResString()
//
//  This system function is used to retrieve a resourcestring and
//   return the result as an AnsiString.  If we believe that the result
//    is only a temporary value, and that it will be immediately
//     assigned to a WideString or a Variant, then we will save the
//      Unicode result as well as a reference to the original Ansi string.
//       WStrFromPCharLen() or VarFromLStr() will return this saved
//        Unicode string if it appears to receive the most recent result
//         of LoadResString.
//--------------------------------------------------------------------


  //===========================================================================================
  //
  //    function CodeMatchesPatternForUnicode(...);
  //
  //    GIVEN:  SomeWideString := SSomeResString;  { WideString := resourcestring }
  //
  //    Delphi will compile this statement into the following:
  //    -------------------------------------------------
  //    TempAnsiString := LoadResString(@SSomeResString);
  //      LINE 1:  lea edx,[SomeTempAnsiString]
  //      LINE 2:  mov eax,[@SomeResString]
  //      LINE 3:  call LoadResString
  //
  //    WStrFromLStr(SomeWideString, TempAnsiString);  { SomeWideString := TempAnsiString }
  //      LINE 4:  mov edx,[SomeTempAnsiString]
  //      LINE 5:  mov/lea eax [@SomeWideString]
  //      LINE 6:  call @WStrFromLStr
  //    -------------------------------------------------
  //
  //    The order in which the parameters are prepared for WStrFromLStr (ie LINE 4 & 5) is
  //      reversed when assigning a non-temporary AnsiString to a WideString.
  //
  //    This code, for example, results in LINE 4 and LINE 5 being swapped.
  //
  //      SomeAnsiString := SSomeResString;
  //      SomeWideString := SomeAnsiString;
  //
  //    Since we know the "signature" used by the compiler, we can detect this pattern.
  //     If we believe it is only temporary, we can save the Unicode results for later
  //      retrieval from WStrFromLStr.
  //
  //    One final note:  When assigning a resourcestring to a Variant, the same patterns exist.
  //===========================================================================================

function CodeMatchesPatternForUnicode(PLine4: PAnsiChar): Boolean;
const
  SIZEOF_OPCODE = 1 {byte};
  MOV_16_OPCODE = AnsiChar($8B); { we'll assume operand size is 16 bits }
  MOV_32_OPCODE = AnsiChar($B8); { we'll assume operand size is 32 bits }
  LEA_OPCODE    = AnsiChar($8D); { operand size can be 16 or 40 bits }
  CALL_OPCODE   = AnsiChar($E8); { assumed operand size is 32 bits }
  BREAK_OPCODE  = AnsiChar($CC); {in a breakpoint}
var
  PLine1: PAnsiChar;
  PLine2: PAnsiChar;
  PLine3: PAnsiChar;
  DataSize: Integer; // bytes in first LEA operand
begin
  Result := False;

  PLine3 := PLine4 - SizeOf(CALL_OPCODE) - 4;
  PLine2 := PLine3 - SizeOf(MOV_32_OPCODE) - 4;

  // figure PLine1 and operand size
  DataSize := 2; { try 16 bit operand for line 1 }
  PLine1 := PLine2 - DataSize - SizeOf(LEA_OPCODE);
  if (PLine1^ <> LEA_OPCODE) and (not (IsDebugging and (PLine1^ = BREAK_OPCODE))) then
  begin
    DataSize := 5; { try 40 bit operand for line 1 }
    PLine1 := PLine2 - DataSize - SizeOf(LEA_OPCODE);
  end;
  if (PLine1^ = LEA_OPCODE) or (IsDebugging and (PLine1^ = BREAK_OPCODE)) then
  begin
    if CompareMem(PLine1 + SIZEOF_OPCODE, PLine4 + SIZEOF_OPCODE, DataSize) then
    begin
      // After this check, it seems to match the WideString <- (temp) AnsiString pattern
      Result := True; // It is probably OK. (The side effects of being wrong aren't very bad.)
    end;
  end;
end;

threadvar
  PLastResString: PAnsiChar;
  LastResStringValue: AnsiString;
  LastWideResString: WideString;

procedure FreeTntSystemThreadVars;
begin
  LastResStringValue := '';
  LastWideResString := '';
end;

procedure Custom_System_EndThread(ExitCode: Integer);
begin
  FreeTntSystemThreadVars;
  {$IFDEF COMPILER_10_UP}
  if Assigned(SystemThreadEndProc) then
    SystemThreadEndProc(ExitCode);
  {$ENDIF}
  ExitThread(ExitCode);
end;

function Custom_System_LoadResString(ResStringRec: PResStringRec): AnsiString;
var
  ReturnAddr: Pointer;
begin
  // get return address
  asm
    PUSH   ECX
    MOV    ECX, [EBP + 4]
    MOV    ReturnAddr, ECX
    POP    ECX
  end;
  // check calling code pattern
  if CodeMatchesPatternForUnicode(ReturnAddr) then begin
    // result will probably be assigned to an intermediate AnsiString
    //   on its way to either a WideString or Variant.
    LastWideResString := WideLoadResString(ResStringRec);
    Result := LastWideResString;
    LastResStringValue := Result;
    if Result = '' then
      PLastResString := nil
    else
      PLastResString := PAnsiChar(Result);
  end else begin
    // result will probably be assigned to an actual AnsiString variable.
    PLastResString := nil;
    Result := WideLoadResString(ResStringRec);
  end;
end;

//--------------------------------------------------------------------
//                WStrFromPCharLen()
//
//  This system function is used to assign an AnsiString to a WideString.
//   It has been modified to assign Unicode results from LoadResString.
//     Another purpose of this function is to specify the code page.
//--------------------------------------------------------------------

procedure Custom_System_WStrFromPCharLen(var Dest: WideString; Source: PAnsiChar; Length: Integer);
var
  DestLen: Integer;
  Buffer: array[0..2047] of WideChar;
  Local_PLastResString: Pointer;
begin
  Local_PLastResString := PLastResString;
  if  (Local_PLastResString <> nil)
  and (Local_PLastResString = Source)
  and (System.Length(LastResStringValue) = Length)
  and (LastResStringValue = Source) then begin
    // use last unicode resource string
    PLastResString := nil; { clear for further use }
    Dest := LastWideResString;
  end else begin
    if Local_PLastResString <> nil then
      PLastResString := nil; { clear for further use }
    if Length <= 0 then
    begin
      Dest := '';
      Exit;
    end;
    if Length + 1 < High(Buffer) then
    begin
      DestLen := MultiByteToWideChar(DefaultSystemCodePage, 0, Source, Length, Buffer,
        High(Buffer));
      if DestLen > 0 then
      begin
        SetLength(Dest, DestLen);
        Move(Pointer(@Buffer[0])^, Pointer(Dest)^, DestLen * SizeOf(WideChar));
        Exit;
      end;
    end;
    DestLen := (Length + 1);
    SetLength(Dest, DestLen); // overallocate, trim later
    DestLen := MultiByteToWideChar(DefaultSystemCodePage, 0, Source, Length, Pointer(Dest),
      DestLen);
    if DestLen < 0 then
      DestLen := 0;
    SetLength(Dest, DestLen);
  end;
end;

{$IFNDEF COMPILER_9_UP}

//--------------------------------------------------------------------
//                LStrFromPWCharLen()
//
//  This system function is used to assign an WideString to an AnsiString.
//   It has not been modified from its original purpose other than to specify the code page.
//--------------------------------------------------------------------

procedure Custom_System_LStrFromPWCharLen(var Dest: AnsiString; Source: PWideChar; Length: Integer);
var
  DestLen: Integer;
  Buffer: array[0..4095] of AnsiChar;
begin
  if Length <= 0 then
  begin
    Dest := '';
    Exit;
  end;
  if Length + 1 < (High(Buffer) div sizeof(WideChar)) then
  begin
    DestLen := WideCharToMultiByte(DefaultSystemCodePage, 0, Source,
      Length, Buffer, High(Buffer),
      nil, nil);
    if DestLen >= 0 then
    begin
      SetLength(Dest, DestLen);
      Move(Pointer(@Buffer[0])^, PAnsiChar(Dest)^, DestLen);
      Exit;
    end;
  end;

  DestLen := (Length + 1) * sizeof(WideChar);
  SetLength(Dest, DestLen); // overallocate, trim later
  DestLen := WideCharToMultiByte(DefaultSystemCodePage, 0, Source, Length, Pointer(Dest), DestLen,
    nil, nil);
  if DestLen < 0 then
    DestLen := 0;
  SetLength(Dest, DestLen);
end;

//--------------------------------------------------------------------
//                WStrToString()
//
//  This system function is used to assign an WideString to an short string.
//   It has not been modified from its original purpose other than to specify the code page.
//--------------------------------------------------------------------

procedure Custom_System_WStrToString(Dest: PShortString; const Source: WideString; MaxLen: Integer);
var
  SourceLen, DestLen: Integer;
  Buffer: array[0..511] of AnsiChar;
begin
  if MaxLen > 255 then MaxLen := 255;
  SourceLen := Length(Source);
  if SourceLen >= MaxLen then SourceLen := MaxLen;
  if SourceLen = 0 then
    DestLen := 0
  else begin
    DestLen := WideCharToMultiByte(DefaultSystemCodePage, 0, Pointer(Source), SourceLen,
      Buffer, SizeOf(Buffer), nil, nil);
    if DestLen > MaxLen then DestLen := MaxLen;
  end;
  Dest^[0] := Chr(DestLen);
  if DestLen > 0 then Move(Buffer, Dest^[1], DestLen);
end;

{$ENDIF}

//--------------------------------------------------------------------
//                VarFromLStr()
//
//  This system function is used to assign an AnsiString to a Variant.
//   It has been modified to assign Unicode results from LoadResString.
//--------------------------------------------------------------------

procedure Custom_System_VarFromLStr(var V: TVarData; const Value: AnsiString);
const
  varDeepData = $BFE8;
var
  Local_PLastResString: Pointer;
begin
  if (V.VType and varDeepData) <> 0 then
    VarClear(PVariant(@V)^);

  Local_PLastResString := PLastResString;
  if  (Local_PLastResString <> nil)
  and (Local_PLastResString = PAnsiChar(Value))
  and (LastResStringValue = Value) then begin
    // use last unicode resource string
    PLastResString := nil; { clear for further use }
    V.VOleStr := nil;
    V.VType := varOleStr;
    WideString(Pointer(V.VOleStr)) := Copy(LastWideResString, 1, MaxInt);
  end else begin
    if Local_PLastResString <> nil then
      PLastResString := nil; { clear for further use }
    V.VString := nil;
    V.VType := varString;
    AnsiString(V.VString) := Value;
  end;
end;

{$IFNDEF COMPILER_9_UP}

//--------------------------------------------------------------------
//                WStrCat3()     A := B + C;
//
//  This system function is used to concatenate two strings into one result.
//    This function is added because A := '' + '' doesn't necessarily result in A = '';
//--------------------------------------------------------------------

procedure Custom_System_WStrCat3(var Dest: WideString; const Source1, Source2: WideString);

  function NewWideString(CharLength: Longint): Pointer;
  var
    _NewWideString: function(CharLength: Longint): Pointer;
  begin
    asm
      PUSH   ECX
      MOV    ECX, offset System.@NewWideString;
      MOV    _NewWideString, ECX
      POP    ECX
    end;
    Result := _NewWideString(CharLength);
  end;

  procedure WStrSet(var S: WideString; P: PWideChar);
  var
    Temp: Pointer;
  begin
    Temp := Pointer(InterlockedExchange(Integer(S), Integer(P)));
    if Temp <> nil then
      WideString(Temp) := '';
  end;

var
  Source1Len, Source2Len: Integer;
  NewStr: PWideChar;
begin
  Source1Len := Length(Source1);
  Source2Len := Length(Source2);
  if (Source1Len <> 0) or (Source2Len <> 0) then
  begin
    NewStr := NewWideString(Source1Len + Source2Len);
    Move(Pointer(Source1)^, Pointer(NewStr)^, Source1Len * sizeof(WideChar));
    Move(Pointer(Source2)^, NewStr[Source1Len], Source2Len * sizeof(WideChar));
    WStrSet(Dest, NewStr);
  end else
    Dest := '';
end;

{$ENDIF}

//--------------------------------------------------------------------
//                System proc replacements
//--------------------------------------------------------------------

type
  POverwrittenData = ^TOverwrittenData;
  TOverwrittenData = record
    Location: Pointer;
    OldCode: array[0..6] of Byte;
  end;

procedure OverwriteProcedure(OldProcedure, NewProcedure: pointer; Data: POverwrittenData = nil);
{ OverwriteProcedure originally from Igor Siticov }
{ Modified by Jacques Garcia Vazquez }
var
  x: PAnsiChar;
  y: integer;
  ov2, ov: cardinal;
  p: pointer;
begin
  if Assigned(Data) and (Data.Location <> nil) then
    exit; { procedure already overwritten }

  // need six bytes in place of 5
  x := PAnsiChar(OldProcedure);
  if not VirtualProtect(Pointer(x), 6, PAGE_EXECUTE_READWRITE, @ov) then
    RaiseLastOSError;

  // if a jump is present then a redirect is found
  // $FF25 = jmp dword ptr [xxx]
  // This redirect is normally present in bpl files, but not in exe files
  p := OldProcedure;

  if Word(p^) = $25FF then
  begin
    Inc(Integer(p), 2); // skip the jump
    // get the jump address p^ and dereference it p^^
    p := Pointer(Pointer(p^)^);

    // release the memory
    if not VirtualProtect(Pointer(x), 6, ov, @ov2) then
      RaiseLastOSError;

    // re protect the correct one
    x := PAnsiChar(p);
    if not VirtualProtect(Pointer(x), 6, PAGE_EXECUTE_READWRITE, @ov) then
      RaiseLastOSError;
  end;

  if Assigned(Data) then
  begin
    Move(x^, Data.OldCode, 6);
    { Assign Location last so that Location <> nil only if OldCode is properly initialized. }
    Data.Location := x;
  end;

  x[0] := AnsiChar($E9);
  y := integer(NewProcedure) - integer(p) - 5;
  x[1] := AnsiChar(y and 255);
  x[2] := AnsiChar((y shr 8) and 255);
  x[3] := AnsiChar((y shr 16) and 255);
  x[4] := AnsiChar((y shr 24) and 255);

  if not VirtualProtect(Pointer(x), 6, ov, @ov2) then
    RaiseLastOSError;
end;

procedure RestoreProcedure(OriginalProc: Pointer; Data: TOverwrittenData);
var
  ov, ov2: Cardinal;
begin
  if Data.Location <> nil then begin
    if not VirtualProtect(Data.Location, 6, PAGE_EXECUTE_READWRITE, @ov) then
      RaiseLastOSError;
    Move(Data.OldCode, Data.Location^, 6);
    if not VirtualProtect(Data.Location, 6, ov, @ov2) then
      RaiseLastOSError;
  end;
end;

function Addr_System_EndThread: Pointer;
begin
  Result := @System.EndThread;
end;

function Addr_System_LoadResString: Pointer;
begin
  Result := @System.LoadResString{TNT-ALLOW LoadResString};
end;

function Addr_System_WStrFromPCharLen: Pointer;
asm
  mov eax, offset System.@WStrFromPCharLen;
end;

{$IFNDEF COMPILER_9_UP}
function Addr_System_LStrFromPWCharLen: Pointer;
asm
  mov eax, offset System.@LStrFromPWCharLen;
end;

function Addr_System_WStrToString: Pointer;
asm
  mov eax, offset System.@WStrToString;
end;
{$ENDIF}

function Addr_System_VarFromLStr: Pointer;
asm
  mov eax, offset System.@VarFromLStr;
end;

function Addr_System_WStrCat3: Pointer;
asm
  mov eax, offset System.@WStrCat3;
end;

var
  System_EndThread_Code,
  System_LoadResString_Code,
  System_WStrFromPCharLen_Code,
  {$IFNDEF COMPILER_9_UP}
  System_LStrFromPWCharLen_Code,
  System_WStrToString_Code,
  {$ENDIF}
  System_VarFromLStr_Code
  {$IFNDEF COMPILER_9_UP}
  ,
  System_WStrCat3_Code,
  SysUtils_WideFmtStr_Code
  {$ENDIF}
  : TOverwrittenData;

procedure InstallEndThreadOverride;
begin
  OverwriteProcedure(Addr_System_EndThread,  @Custom_System_EndThread,  @System_EndThread_Code);
end;

procedure InstallStringConversionOverrides;
begin
  OverwriteProcedure(Addr_System_WStrFromPCharLen,  @Custom_System_WStrFromPCharLen,  @System_WStrFromPCharLen_Code);
  {$IFNDEF COMPILER_9_UP}
  OverwriteProcedure(Addr_System_LStrFromPWCharLen, @Custom_System_LStrFromPWCharLen, @System_LStrFromPWCharLen_Code);
  OverwriteProcedure(Addr_System_WStrToString,      @Custom_System_WStrToString,      @System_WStrToString_Code);
  {$ENDIF}
end;

procedure InstallWideResourceStrings;
begin
  OverwriteProcedure(Addr_System_LoadResString,     @Custom_System_LoadResString,     @System_LoadResString_Code);
  OverwriteProcedure(Addr_System_VarFromLStr,       @Custom_System_VarFromLStr,       @System_VarFromLStr_Code);
end;

{$IFNDEF COMPILER_9_UP}
procedure InstallWideStringConcatenationFix;
begin
  OverwriteProcedure(Addr_System_WStrCat3,          @Custom_System_WStrCat3,          @System_WStrCat3_Code);
end;

procedure InstallWideFormatFixes;
begin
  OverwriteProcedure(@SysUtils.WideFmtStr, @TntSysUtils.Tnt_WideFmtStr, @SysUtils_WideFmtStr_Code);
end;
{$ENDIF}

procedure InstallTntSystemUpdates(Updates: TTntSystemUpdateSet = AllTntSystemUpdates);
begin
  InstallEndThreadOverride;
  if tsWideResourceStrings in Updates then begin
    InstallStringConversionOverrides;
    InstallWideResourceStrings;
  end;
  {$IFNDEF COMPILER_9_UP}
    if tsFixImplicitCodePage in Updates then begin
      InstallStringConversionOverrides;
      { CP_ACP is the code page used by the non-Unicode Windows API. }
      GDefaultSystemCodePage := CP_ACP{TNT-ALLOW CP_ACP};
    end;
    if tsFixWideStrConcat in Updates then begin
      InstallWideStringConcatenationFix;
    end;
    if tsFixWideFormat in Updates then begin
      InstallWideFormatFixes;
    end;
  {$ENDIF}
end;

{$IFNDEF COMPILER_9_UP}
var
  StartupDefaultUserCodePage: Cardinal;
{$ENDIF}

procedure UninstallSystemOverrides;
begin
  RestoreProcedure(Addr_System_EndThread,  System_EndThread_Code);
  // String Conversion
  RestoreProcedure(Addr_System_WStrFromPCharLen,  System_WStrFromPCharLen_Code);
  {$IFNDEF COMPILER_9_UP}
  RestoreProcedure(Addr_System_LStrFromPWCharLen, System_LStrFromPWCharLen_Code);
  RestoreProcedure(Addr_System_WStrToString,      System_WStrToString_Code);
  GDefaultSystemCodePage := StartupDefaultUserCodePage;
  {$ENDIF}
  // Wide resourcestring
  RestoreProcedure(Addr_System_LoadResString,     System_LoadResString_Code);
  RestoreProcedure(Addr_System_VarFromLStr,       System_VarFromLStr_Code);
  {$IFNDEF COMPILER_9_UP}
  // WideString concat fix
  RestoreProcedure(Addr_System_WStrCat3,          System_WStrCat3_Code);
  // WideFormat fixes
  RestoreProcedure(@SysUtils.WideFmtStr, SysUtils_WideFmtStr_Code);
  {$ENDIF}
end;

{$ENDIF USE_SYSTEM_OVERRIDES}

initialization
  {$IFDEF COMPILER_9_UP}
    {$DEFINE USE_GETACP}
  {$ENDIF}
  {$IFDEF FPC}
    {$DEFINE USE_GETACP}
  {$ENDIF}
  {$IFDEF USE_GETACP}
  GDefaultSystemCodePage := GetACP;
  {$ELSE}
    {$IFDEF COMPILER_7_UP}
    if (Win32Platform = VER_PLATFORM_WIN32_NT) and (Win32MajorVersion >= 5) then
      GDefaultSystemCodePage := CP_THREAD_ACP // Win 2K/XP/...
    else
      GDefaultSystemCodePage := LCIDToCodePage(GetThreadLocale); // Win NT4/95/98/ME
    {$ELSE}
    GDefaultSystemCodePage := CP_ACP{TNT-ALLOW CP_ACP};
    {$ENDIF}
  {$ENDIF}
  {$IFDEF USE_SYSTEM_OVERRIDES}
  {$IFNDEF COMPILER_9_UP}
  StartupDefaultUserCodePage := DefaultSystemCodePage;
  {$ENDIF}
  IsDebugging := DebugHook > 0;
  {$ENDIF USE_SYSTEM_OVERRIDES}

finalization
  {$IFDEF USE_SYSTEM_OVERRIDES}
  UninstallSystemOverrides;
  FreeTntSystemThreadVars; { Make MemorySleuth happy. }
  {$ENDIF USE_SYSTEM_OVERRIDES}

end.