aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/icu/include/unicode/uspoof.h
blob: 63a13387b063be27bff286090c17f99063f40152 (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
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
***************************************************************************
* Copyright (C) 2008-2016, International Business Machines Corporation
* and others. All Rights Reserved.
***************************************************************************
*   file name:  uspoof.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2008Feb13
*   created by: Andy Heninger
*
*   Unicode Spoof Detection
*/

#ifndef USPOOF_H
#define USPOOF_H

#include "unicode/utypes.h"
#include "unicode/uset.h"
#include "unicode/parseerr.h"
#include "unicode/localpointer.h"

#if !UCONFIG_NO_NORMALIZATION


#if U_SHOW_CPLUSPLUS_API
#include "unicode/unistr.h"
#include "unicode/uniset.h"
#endif


/**
 * \file
 * \brief Unicode Security and Spoofing Detection, C API.
 *
 * <p>
 * This class, based on <a href="http://unicode.org/reports/tr36">Unicode Technical Report #36</a> and
 * <a href="http://unicode.org/reports/tr39">Unicode Technical Standard #39</a>, has two main functions:
 *
 * <ol>
 * <li>Checking whether two strings are visually <em>confusable</em> with each other, such as "Harvest" and
 * &quot;&Eta;arvest&quot;, where the second string starts with the Greek capital letter Eta.</li>
 * <li>Checking whether an individual string is likely to be an attempt at confusing the reader (<em>spoof
 * detection</em>), such as "paypal" with some Latin characters substituted with Cyrillic look-alikes.</li>
 * </ol>
 *
 * <p>
 * Although originally designed as a method for flagging suspicious identifier strings such as URLs,
 * <code>USpoofChecker</code> has a number of other practical use cases, such as preventing attempts to evade bad-word
 * content filters.
 *
 * <p>
 * The functions of this class are exposed as C API, with a handful of syntactical conveniences for C++.
 *
 * <h2>Confusables</h2>
 *
 * <p>
 * The following example shows how to use <code>USpoofChecker</code> to check for confusability between two strings:
 *
 * \code{.c}
 * UErrorCode status = U_ZERO_ERROR;
 * UChar* str1 = (UChar*) u"Harvest";
 * UChar* str2 = (UChar*) u"\u0397arvest";  // with U+0397 GREEK CAPITAL LETTER ETA
 *
 * USpoofChecker* sc = uspoof_open(&status);
 * uspoof_setChecks(sc, USPOOF_CONFUSABLE, &status);
 *
 * int32_t bitmask = uspoof_areConfusable(sc, str1, -1, str2, -1, &status);
 * UBool result = bitmask != 0;
 * // areConfusable: 1 (status: U_ZERO_ERROR)
 * printf("areConfusable: %d (status: %s)\n", result, u_errorName(status));
 * uspoof_close(sc);
 * \endcode
 *
 * <p>
 * The call to {@link uspoof_open} creates a <code>USpoofChecker</code> object; the call to {@link uspoof_setChecks}
 * enables confusable checking and disables all other checks; the call to {@link uspoof_areConfusable} performs the
 * confusability test; and the following line extracts the result out of the return value. For best performance,
 * the instance should be created once (e.g., upon application startup), and the efficient
 * {@link uspoof_areConfusable} method can be used at runtime.
 *
 * <p>
 * The type {@link LocalUSpoofCheckerPointer} is exposed for C++ programmers.  It will automatically call
 * {@link uspoof_close} when the object goes out of scope:
 *
 * \code{.cpp}
 * UErrorCode status = U_ZERO_ERROR;
 * LocalUSpoofCheckerPointer sc(uspoof_open(&status));
 * uspoof_setChecks(sc.getAlias(), USPOOF_CONFUSABLE, &status);
 * // ...
 * \endcode
 *
 * UTS 39 defines two strings to be <em>confusable</em> if they map to the same <em>skeleton string</em>. A skeleton can
 * be thought of as a "hash code". {@link uspoof_getSkeleton} computes the skeleton for a particular string, so
 * the following snippet is equivalent to the example above:
 *
 * \code{.c}
 * UErrorCode status = U_ZERO_ERROR;
 * UChar* str1 = (UChar*) u"Harvest";
 * UChar* str2 = (UChar*) u"\u0397arvest";  // with U+0397 GREEK CAPITAL LETTER ETA
 *
 * USpoofChecker* sc = uspoof_open(&status);
 * uspoof_setChecks(sc, USPOOF_CONFUSABLE, &status);
 *
 * // Get skeleton 1
 * int32_t skel1Len = uspoof_getSkeleton(sc, 0, str1, -1, NULL, 0, &status);
 * UChar* skel1 = (UChar*) malloc(++skel1Len * sizeof(UChar));
 * status = U_ZERO_ERROR;
 * uspoof_getSkeleton(sc, 0, str1, -1, skel1, skel1Len, &status);
 *
 * // Get skeleton 2
 * int32_t skel2Len = uspoof_getSkeleton(sc, 0, str2, -1, NULL, 0, &status);
 * UChar* skel2 = (UChar*) malloc(++skel2Len * sizeof(UChar));
 * status = U_ZERO_ERROR;
 * uspoof_getSkeleton(sc, 0, str2, -1, skel2, skel2Len, &status);
 *
 * // Are the skeletons the same?
 * UBool result = u_strcmp(skel1, skel2) == 0;
 * // areConfusable: 1 (status: U_ZERO_ERROR)
 * printf("areConfusable: %d (status: %s)\n", result, u_errorName(status));
 * uspoof_close(sc);
 * free(skel1);
 * free(skel2);
 * \endcode
 *
 * If you need to check if a string is confusable with any string in a dictionary of many strings, rather than calling
 * {@link uspoof_areConfusable} many times in a loop, {@link uspoof_getSkeleton} can be used instead, as shown below:
 *
 * \code{.c}
 * UErrorCode status = U_ZERO_ERROR;
 * #define DICTIONARY_LENGTH 2
 * UChar* dictionary[DICTIONARY_LENGTH] = { (UChar*) u"lorem", (UChar*) u"ipsum" };
 * UChar* skeletons[DICTIONARY_LENGTH];
 * UChar* str = (UChar*) u"1orern";
 *
 * // Setup:
 * USpoofChecker* sc = uspoof_open(&status);
 * uspoof_setChecks(sc, USPOOF_CONFUSABLE, &status);
 * for (size_t i=0; i<DICTIONARY_LENGTH; i++) {
 *     UChar* word = dictionary[i];
 *     int32_t len = uspoof_getSkeleton(sc, 0, word, -1, NULL, 0, &status);
 *     skeletons[i] = (UChar*) malloc(++len * sizeof(UChar));
 *     status = U_ZERO_ERROR;
 *     uspoof_getSkeleton(sc, 0, word, -1, skeletons[i], len, &status);
 * }
 *
 * // Live Check:
 * {
 *     int32_t len = uspoof_getSkeleton(sc, 0, str, -1, NULL, 0, &status);
 *     UChar* skel = (UChar*) malloc(++len * sizeof(UChar));
 *     status = U_ZERO_ERROR;
 *     uspoof_getSkeleton(sc, 0, str, -1, skel, len, &status);
 *     UBool result = FALSE;
 *     for (size_t i=0; i<DICTIONARY_LENGTH; i++) {
 *         result = u_strcmp(skel, skeletons[i]) == 0;
 *         if (result == TRUE) { break; }
 *     }
 *     // Has confusable in dictionary: 1 (status: U_ZERO_ERROR)
 *     printf("Has confusable in dictionary: %d (status: %s)\n", result, u_errorName(status));
 *     free(skel);
 * }
 *
 * for (size_t i=0; i<DICTIONARY_LENGTH; i++) {
 *     free(skeletons[i]);
 * }
 * uspoof_close(sc);
 * \endcode
 *
 * <b>Note:</b> Since the Unicode confusables mapping table is frequently updated, confusable skeletons are <em>not</em>
 * guaranteed to be the same between ICU releases. We therefore recommend that you always compute confusable skeletons
 * at runtime and do not rely on creating a permanent, or difficult to update, database of skeletons.
 *
 * <h2>Spoof Detection</h2>
 *
 * The following snippet shows a minimal example of using <code>USpoofChecker</code> to perform spoof detection on a
 * string:
 *
 * \code{.c}
 * UErrorCode status = U_ZERO_ERROR;
 * UChar* str = (UChar*) u"p\u0430ypal";  // with U+0430 CYRILLIC SMALL LETTER A
 *
 * // Get the default set of allowable characters:
 * USet* allowed = uset_openEmpty();
 * uset_addAll(allowed, uspoof_getRecommendedSet(&status));
 * uset_addAll(allowed, uspoof_getInclusionSet(&status));
 *
 * USpoofChecker* sc = uspoof_open(&status);
 * uspoof_setAllowedChars(sc, allowed, &status);
 * uspoof_setRestrictionLevel(sc, USPOOF_MODERATELY_RESTRICTIVE);
 *
 * int32_t bitmask = uspoof_check(sc, str, -1, NULL, &status);
 * UBool result = bitmask != 0;
 * // fails checks: 1 (status: U_ZERO_ERROR)
 * printf("fails checks: %d (status: %s)\n", result, u_errorName(status));
 * uspoof_close(sc);
 * uset_close(allowed);
 * \endcode
 *
 * As in the case for confusability checking, it is good practice to create one <code>USpoofChecker</code> instance at
 * startup, and call the cheaper {@link uspoof_check} online. We specify the set of
 * allowed characters to be those with type RECOMMENDED or INCLUSION, according to the recommendation in UTS 39.
 *
 * In addition to {@link uspoof_check}, the function {@link uspoof_checkUTF8} is exposed for UTF8-encoded char* strings,
 * and {@link uspoof_checkUnicodeString} is exposed for C++ programmers.
 *
 * If the {@link USPOOF_AUX_INFO} check is enabled, a limited amount of information on why a string failed the checks
 * is available in the returned bitmask.  For complete information, use the {@link uspoof_check2} class of functions
 * with a {@link USpoofCheckResult} parameter:
 *
 * \code{.c}
 * UErrorCode status = U_ZERO_ERROR;
 * UChar* str = (UChar*) u"p\u0430ypal";  // with U+0430 CYRILLIC SMALL LETTER A
 *
 * // Get the default set of allowable characters:
 * USet* allowed = uset_openEmpty();
 * uset_addAll(allowed, uspoof_getRecommendedSet(&status));
 * uset_addAll(allowed, uspoof_getInclusionSet(&status));
 *
 * USpoofChecker* sc = uspoof_open(&status);
 * uspoof_setAllowedChars(sc, allowed, &status);
 * uspoof_setRestrictionLevel(sc, USPOOF_MODERATELY_RESTRICTIVE);
 *
 * USpoofCheckResult* checkResult = uspoof_openCheckResult(&status);
 * int32_t bitmask = uspoof_check2(sc, str, -1, checkResult, &status);
 *
 * int32_t failures1 = bitmask;
 * int32_t failures2 = uspoof_getCheckResultChecks(checkResult, &status);
 * assert(failures1 == failures2);
 * // checks that failed: 0x00000010 (status: U_ZERO_ERROR)
 * printf("checks that failed: %#010x (status: %s)\n", failures1, u_errorName(status));
 *
 * // Cleanup:
 * uspoof_close(sc);
 * uset_close(allowed);
 * uspoof_closeCheckResult(checkResult);
 * \endcode
 *
 * C++ users can take advantage of a few syntactical conveniences.  The following snippet is functionally
 * equivalent to the one above:
 *
 * \code{.cpp}
 * UErrorCode status = U_ZERO_ERROR;
 * UnicodeString str((UChar*) u"p\u0430ypal");  // with U+0430 CYRILLIC SMALL LETTER A
 *
 * // Get the default set of allowable characters:
 * UnicodeSet allowed;
 * allowed.addAll(*uspoof_getRecommendedUnicodeSet(&status));
 * allowed.addAll(*uspoof_getInclusionUnicodeSet(&status));
 *
 * LocalUSpoofCheckerPointer sc(uspoof_open(&status));
 * uspoof_setAllowedChars(sc.getAlias(), allowed.toUSet(), &status);
 * uspoof_setRestrictionLevel(sc.getAlias(), USPOOF_MODERATELY_RESTRICTIVE);
 *
 * LocalUSpoofCheckResultPointer checkResult(uspoof_openCheckResult(&status));
 * int32_t bitmask = uspoof_check2UnicodeString(sc.getAlias(), str, checkResult.getAlias(), &status);
 *
 * int32_t failures1 = bitmask;
 * int32_t failures2 = uspoof_getCheckResultChecks(checkResult.getAlias(), &status);
 * assert(failures1 == failures2);
 * // checks that failed: 0x00000010 (status: U_ZERO_ERROR)
 * printf("checks that failed: %#010x (status: %s)\n", failures1, u_errorName(status));
 *
 * // Explicit cleanup not necessary.
 * \endcode
 *
 * The return value is a bitmask of the checks that failed. In this case, there was one check that failed:
 * {@link USPOOF_RESTRICTION_LEVEL}, corresponding to the fifth bit (16). The possible checks are:
 *
 * <ul>
 * <li><code>RESTRICTION_LEVEL</code>: flags strings that violate the
 * <a href="http://unicode.org/reports/tr39/#Restriction_Level_Detection">Restriction Level</a> test as specified in UTS
 * 39; in most cases, this means flagging strings that contain characters from multiple different scripts.</li>
 * <li><code>INVISIBLE</code>: flags strings that contain invisible characters, such as zero-width spaces, or character
 * sequences that are likely not to display, such as multiple occurrences of the same non-spacing mark.</li>
 * <li><code>CHAR_LIMIT</code>: flags strings that contain characters outside of a specified set of acceptable
 * characters. See {@link uspoof_setAllowedChars} and {@link uspoof_setAllowedLocales}.</li>
 * <li><code>MIXED_NUMBERS</code>: flags strings that contain digits from multiple different numbering systems.</li>
 * </ul>
 *
 * <p>
 * These checks can be enabled independently of each other. For example, if you were interested in checking for only the
 * INVISIBLE and MIXED_NUMBERS conditions, you could do:
 *
 * \code{.c}
 * UErrorCode status = U_ZERO_ERROR;
 * UChar* str = (UChar*) u"8\u09EA";  // 8 mixed with U+09EA BENGALI DIGIT FOUR
 *
 * USpoofChecker* sc = uspoof_open(&status);
 * uspoof_setChecks(sc, USPOOF_INVISIBLE | USPOOF_MIXED_NUMBERS, &status);
 *
 * int32_t bitmask = uspoof_check2(sc, str, -1, NULL, &status);
 * UBool result = bitmask != 0;
 * // fails checks: 1 (status: U_ZERO_ERROR)
 * printf("fails checks: %d (status: %s)\n", result, u_errorName(status));
 * uspoof_close(sc);
 * \endcode
 *
 * Here is an example in C++ showing how to compute the restriction level of a string:
 *
 * \code{.cpp}
 * UErrorCode status = U_ZERO_ERROR;
 * UnicodeString str((UChar*) u"p\u0430ypal");  // with U+0430 CYRILLIC SMALL LETTER A
 *
 * // Get the default set of allowable characters:
 * UnicodeSet allowed;
 * allowed.addAll(*uspoof_getRecommendedUnicodeSet(&status));
 * allowed.addAll(*uspoof_getInclusionUnicodeSet(&status));
 *
 * LocalUSpoofCheckerPointer sc(uspoof_open(&status));
 * uspoof_setAllowedChars(sc.getAlias(), allowed.toUSet(), &status);
 * uspoof_setRestrictionLevel(sc.getAlias(), USPOOF_MODERATELY_RESTRICTIVE);
 * uspoof_setChecks(sc.getAlias(), USPOOF_RESTRICTION_LEVEL | USPOOF_AUX_INFO, &status);
 *
 * LocalUSpoofCheckResultPointer checkResult(uspoof_openCheckResult(&status));
 * int32_t bitmask = uspoof_check2UnicodeString(sc.getAlias(), str, checkResult.getAlias(), &status);
 *
 * URestrictionLevel restrictionLevel = uspoof_getCheckResultRestrictionLevel(checkResult.getAlias(), &status);
 * // Since USPOOF_AUX_INFO was enabled, the restriction level is also available in the upper bits of the bitmask:
 * assert((restrictionLevel & bitmask) == restrictionLevel);
 * // Restriction level: 0x50000000 (status: U_ZERO_ERROR)
 * printf("Restriction level: %#010x (status: %s)\n", restrictionLevel, u_errorName(status));
 * \endcode
 *
 * The code '0x50000000' corresponds to the restriction level USPOOF_MINIMALLY_RESTRICTIVE.  Since
 * USPOOF_MINIMALLY_RESTRICTIVE is weaker than USPOOF_MODERATELY_RESTRICTIVE, the string fails the check.
 *
 * <b>Note:</b> The Restriction Level is the most powerful of the checks. The full logic is documented in
 * <a href="http://unicode.org/reports/tr39/#Restriction_Level_Detection">UTS 39</a>, but the basic idea is that strings
 * are restricted to contain characters from only a single script, <em>except</em> that most scripts are allowed to have
 * Latin characters interspersed. Although the default restriction level is <code>HIGHLY_RESTRICTIVE</code>, it is
 * recommended that users set their restriction level to <code>MODERATELY_RESTRICTIVE</code>, which allows Latin mixed
 * with all other scripts except Cyrillic, Greek, and Cherokee, with which it is often confusable. For more details on
 * the levels, see UTS 39 or {@link URestrictionLevel}. The Restriction Level test is aware of the set of
 * allowed characters set in {@link uspoof_setAllowedChars}. Note that characters which have script code
 * COMMON or INHERITED, such as numbers and punctuation, are ignored when computing whether a string has multiple
 * scripts.
 *
 * <h2>Additional Information</h2>
 *
 * A <code>USpoofChecker</code> instance may be used repeatedly to perform checks on any number of identifiers.
 *
 * <b>Thread Safety:</b> The test functions for checking a single identifier, or for testing whether
 * two identifiers are possible confusable, are thread safe. They may called concurrently, from multiple threads,
 * using the same USpoofChecker instance.
 *
 * More generally, the standard ICU thread safety rules apply: functions that take a const USpoofChecker parameter are
 * thread safe. Those that take a non-const USpoofChecker are not thread safe..
 *
 * @stable ICU 4.6
 */

U_CDECL_BEGIN

struct USpoofChecker;
/**
 * @stable ICU 4.2
 */
typedef struct USpoofChecker USpoofChecker; /**< typedef for C of USpoofChecker */

struct USpoofCheckResult;
/**
 * @see uspoof_openCheckResult
 * @stable ICU 58
 */
typedef struct USpoofCheckResult USpoofCheckResult;

/**
 * Enum for the kinds of checks that USpoofChecker can perform.
 * These enum values are used both to select the set of checks that
 * will be performed, and to report results from the check function.
 *
 * @stable ICU 4.2
 */
typedef enum USpoofChecks {
    /**
     * When performing the two-string {@link uspoof_areConfusable} test, this flag in the return value indicates
     * that the two strings are visually confusable and that they are from the same script, according to UTS 39 section
     * 4.
     *
     * @see uspoof_areConfusable
     * @stable ICU 4.2
     */
    USPOOF_SINGLE_SCRIPT_CONFUSABLE =   1,

    /**
     * When performing the two-string {@link uspoof_areConfusable} test, this flag in the return value indicates
     * that the two strings are visually confusable and that they are <b>not</b> from the same script, according to UTS
     * 39 section 4.
     *
     * @see uspoof_areConfusable
     * @stable ICU 4.2
     */
    USPOOF_MIXED_SCRIPT_CONFUSABLE  =   2,

    /**
     * When performing the two-string {@link uspoof_areConfusable} test, this flag in the return value indicates
     * that the two strings are visually confusable and that they are not from the same script but both of them are
     * single-script strings, according to UTS 39 section 4.
     *
     * @see uspoof_areConfusable
     * @stable ICU 4.2
     */
    USPOOF_WHOLE_SCRIPT_CONFUSABLE  =   4,

    /**
     * Enable this flag in {@link uspoof_setChecks} to turn on all types of confusables.  You may set
     * the checks to some subset of SINGLE_SCRIPT_CONFUSABLE, MIXED_SCRIPT_CONFUSABLE, or WHOLE_SCRIPT_CONFUSABLE to
     * make {@link uspoof_areConfusable} return only those types of confusables.
     *
     * @see uspoof_areConfusable
     * @see uspoof_getSkeleton
     * @stable ICU 58
     */
    USPOOF_CONFUSABLE               =   USPOOF_SINGLE_SCRIPT_CONFUSABLE | USPOOF_MIXED_SCRIPT_CONFUSABLE | USPOOF_WHOLE_SCRIPT_CONFUSABLE,

#ifndef U_HIDE_DEPRECATED_API
    /**
      * This flag is deprecated and no longer affects the behavior of SpoofChecker.
      *
      * @deprecated ICU 58  Any case confusable mappings were removed from UTS 39; the corresponding ICU API was deprecated.
      */
    USPOOF_ANY_CASE                 =   8,
#endif  /* U_HIDE_DEPRECATED_API */

    /**
      * Check that an identifier is no looser than the specified RestrictionLevel.
      * The default if {@link uspoof_setRestrictionLevel} is not called is HIGHLY_RESTRICTIVE.
      *
      * If USPOOF_AUX_INFO is enabled the actual restriction level of the
      * identifier being tested will also be returned by uspoof_check().
      *
      * @see URestrictionLevel
      * @see uspoof_setRestrictionLevel
      * @see USPOOF_AUX_INFO
      *
      * @stable ICU 51
      */
    USPOOF_RESTRICTION_LEVEL        = 16,

#ifndef U_HIDE_DEPRECATED_API
    /** Check that an identifier contains only characters from a
      * single script (plus chars from the common and inherited scripts.)
      * Applies to checks of a single identifier check only.
      * @deprecated ICU 51  Use RESTRICTION_LEVEL instead.
      */
    USPOOF_SINGLE_SCRIPT            =  USPOOF_RESTRICTION_LEVEL,
#endif  /* U_HIDE_DEPRECATED_API */

    /** Check an identifier for the presence of invisible characters,
      * such as zero-width spaces, or character sequences that are
      * likely not to display, such as multiple occurrences of the same
      * non-spacing mark.  This check does not test the input string as a whole
      * for conformance to any particular syntax for identifiers.
      */
    USPOOF_INVISIBLE                =  32,

    /** Check that an identifier contains only characters from a specified set
      * of acceptable characters.  See {@link uspoof_setAllowedChars} and
      * {@link uspoof_setAllowedLocales}.  Note that a string that fails this check
      * will also fail the {@link USPOOF_RESTRICTION_LEVEL} check.
      */
    USPOOF_CHAR_LIMIT               =  64,

    /**
     * Check that an identifier does not mix numbers from different numbering systems.
     * For more information, see UTS 39 section 5.3.
     *
     * @stable ICU 51
     */
    USPOOF_MIXED_NUMBERS            = 128,

    /**
     * Check that an identifier does not have a combining character following a character in which that
     * combining character would be hidden; for example 'i' followed by a U+0307 combining dot.
     *
     * More specifically, the following characters are forbidden from preceding a U+0307:
     * <ul>
     * <li>Those with the Soft_Dotted Unicode property (which includes 'i' and 'j')</li>
     * <li>Latin lowercase letter 'l'</li>
     * <li>Dotless 'i' and 'j' ('ı' and 'ȷ', U+0131 and U+0237)</li>
     * <li>Any character whose confusable prototype ends with such a character
     * (Soft_Dotted, 'l', 'ı', or 'ȷ')</li>
     * </ul>
     * In addition, combining characters are allowed between the above characters and U+0307 except those
     * with combining class 0 or combining class "Above" (230, same class as U+0307).
     *
     * This list and the number of combing characters considered by this check may grow over time.
     *
     * @stable ICU 62
     */
    USPOOF_HIDDEN_OVERLAY            = 256,

   /**
     * Enable all spoof checks.
     *
     * @stable ICU 4.6
     */
    USPOOF_ALL_CHECKS               = 0xFFFF,

    /**
      * Enable the return of auxillary (non-error) information in the
      * upper bits of the check results value.
      *
      * If this "check" is not enabled, the results of {@link uspoof_check} will be
      * zero when an identifier passes all of the enabled checks.
      *
      * If this "check" is enabled, (uspoof_check() & {@link USPOOF_ALL_CHECKS}) will
      * be zero when an identifier passes all checks.
      *
      * @stable ICU 51
      */
    USPOOF_AUX_INFO                  = 0x40000000

    } USpoofChecks;


    /**
     * Constants from UAX #39 for use in {@link uspoof_setRestrictionLevel}, and
     * for returned identifier restriction levels in check results.
     *
     * @stable ICU 51
     *
     * @see uspoof_setRestrictionLevel
     * @see uspoof_check
     */
    typedef enum URestrictionLevel {
        /**
         * All characters in the string are in the identifier profile and all characters in the string are in the
         * ASCII range.
         *
         * @stable ICU 51
         */
        USPOOF_ASCII = 0x10000000,
        /**
         * The string classifies as ASCII-Only, or all characters in the string are in the identifier profile and
         * the string is single-script, according to the definition in UTS 39 section 5.1.
         *
         * @stable ICU 53
         */
        USPOOF_SINGLE_SCRIPT_RESTRICTIVE = 0x20000000,
        /**
         * The string classifies as Single Script, or all characters in the string are in the identifier profile and
         * the string is covered by any of the following sets of scripts, according to the definition in UTS 39
         * section 5.1:
         * <ul>
         *   <li>Latin + Han + Bopomofo (or equivalently: Latn + Hanb)</li>
         *   <li>Latin + Han + Hiragana + Katakana (or equivalently: Latn + Jpan)</li>
         *   <li>Latin + Han + Hangul (or equivalently: Latn +Kore)</li>
         * </ul>
         * This is the default restriction in ICU.
         *
         * @stable ICU 51
         */
        USPOOF_HIGHLY_RESTRICTIVE = 0x30000000,
        /**
         * The string classifies as Highly Restrictive, or all characters in the string are in the identifier profile
         * and the string is covered by Latin and any one other Recommended or Aspirational script, except Cyrillic,
         * Greek, and Cherokee.
         *
         * @stable ICU 51
         */
        USPOOF_MODERATELY_RESTRICTIVE = 0x40000000,
        /**
         * All characters in the string are in the identifier profile.  Allow arbitrary mixtures of scripts.
         *
         * @stable ICU 51
         */
        USPOOF_MINIMALLY_RESTRICTIVE = 0x50000000,
        /**
         * Any valid identifiers, including characters outside of the Identifier Profile.
         *
         * @stable ICU 51
         */
        USPOOF_UNRESTRICTIVE = 0x60000000,
        /**
         * Mask for selecting the Restriction Level bits from the return value of {@link uspoof_check}.
         *
         * @stable ICU 53
         */
        USPOOF_RESTRICTION_LEVEL_MASK = 0x7F000000,
#ifndef U_HIDE_INTERNAL_API
        /**
         * An undefined restriction level.
         * @internal
         */
        USPOOF_UNDEFINED_RESTRICTIVE = -1
#endif  /* U_HIDE_INTERNAL_API */
    } URestrictionLevel;

/**
 *  Create a Unicode Spoof Checker, configured to perform all
 *  checks except for USPOOF_LOCALE_LIMIT and USPOOF_CHAR_LIMIT.
 *  Note that additional checks may be added in the future,
 *  resulting in the changes to the default checking behavior.
 *
 *  @param status  The error code, set if this function encounters a problem.
 *  @return        the newly created Spoof Checker
 *  @stable ICU 4.2
 */
U_STABLE USpoofChecker * U_EXPORT2
uspoof_open(UErrorCode *status);


/**
 * Open a Spoof checker from its serialized form, stored in 32-bit-aligned memory.
 * Inverse of uspoof_serialize().
 * The memory containing the serialized data must remain valid and unchanged
 * as long as the spoof checker, or any cloned copies of the spoof checker,
 * are in use.  Ownership of the memory remains with the caller.
 * The spoof checker (and any clones) must be closed prior to deleting the
 * serialized data.
 *
 * @param data a pointer to 32-bit-aligned memory containing the serialized form of spoof data
 * @param length the number of bytes available at data;
 *               can be more than necessary
 * @param pActualLength receives the actual number of bytes at data taken up by the data;
 *                      can be NULL
 * @param pErrorCode ICU error code
 * @return the spoof checker.
 *
 * @see uspoof_open
 * @see uspoof_serialize
 * @stable ICU 4.2
 */
U_STABLE USpoofChecker * U_EXPORT2
uspoof_openFromSerialized(const void *data, int32_t length, int32_t *pActualLength,
                          UErrorCode *pErrorCode);

/**
  * Open a Spoof Checker from the source form of the spoof data.
  * The input corresponds to the Unicode data file confusables.txt
  * as described in Unicode UAX #39.  The syntax of the source data
  * is as described in UAX #39 for this file, and the content of
  * this file is acceptable input.
  *
  * The character encoding of the (char *) input text is UTF-8.
  *
  * @param confusables a pointer to the confusable characters definitions,
  *                    as found in file confusables.txt from unicode.org.
  * @param confusablesLen The length of the confusables text, or -1 if the
  *                    input string is zero terminated.
  * @param confusablesWholeScript
  *                    Deprecated in ICU 58.  No longer used.
  * @param confusablesWholeScriptLen
  *                    Deprecated in ICU 58.  No longer used.
  * @param errType     In the event of an error in the input, indicates
  *                    which of the input files contains the error.
  *                    The value is one of USPOOF_SINGLE_SCRIPT_CONFUSABLE or
  *                    USPOOF_WHOLE_SCRIPT_CONFUSABLE, or
  *                    zero if no errors are found.
  * @param pe          In the event of an error in the input, receives the position
  *                    in the input text (line, offset) of the error.
  * @param status      an in/out ICU UErrorCode.  Among the possible errors is
  *                    U_PARSE_ERROR, which is used to report syntax errors
  *                    in the input.
  * @return            A spoof checker that uses the rules from the input files.
  * @stable ICU 4.2
  */
U_STABLE USpoofChecker * U_EXPORT2
uspoof_openFromSource(const char *confusables,  int32_t confusablesLen,
                      const char *confusablesWholeScript, int32_t confusablesWholeScriptLen,
                      int32_t *errType, UParseError *pe, UErrorCode *status);


/**
  * Close a Spoof Checker, freeing any memory that was being held by
  *   its implementation.
  * @stable ICU 4.2
  */
U_STABLE void U_EXPORT2
uspoof_close(USpoofChecker *sc);

/**
 * Clone a Spoof Checker.  The clone will be set to perform the same checks
 *   as the original source.
 *
 * @param sc       The source USpoofChecker
 * @param status   The error code, set if this function encounters a problem.
 * @return
 * @stable ICU 4.2
 */
U_STABLE USpoofChecker * U_EXPORT2
uspoof_clone(const USpoofChecker *sc, UErrorCode *status);


/**
 * Specify the bitmask of checks that will be performed by {@link uspoof_check}. Calling this method
 * overwrites any checks that may have already been enabled. By default, all checks are enabled.
 *
 * To enable specific checks and disable all others, the "whitelisted" checks should be ORed together. For
 * example, to fail strings containing characters outside of the set specified by {@link uspoof_setAllowedChars} and
 * also strings that contain digits from mixed numbering systems:
 *
 * <pre>
 * {@code
 * uspoof_setChecks(USPOOF_CHAR_LIMIT | USPOOF_MIXED_NUMBERS);
 * }
 * </pre>
 *
 * To disable specific checks and enable all others, the "blacklisted" checks should be ANDed away from
 * ALL_CHECKS. For example, if you are not planning to use the {@link uspoof_areConfusable} functionality,
 * it is good practice to disable the CONFUSABLE check:
 *
 * <pre>
 * {@code
 * uspoof_setChecks(USPOOF_ALL_CHECKS & ~USPOOF_CONFUSABLE);
 * }
 * </pre>
 *
 * Note that methods such as {@link uspoof_setAllowedChars}, {@link uspoof_setAllowedLocales}, and
 * {@link uspoof_setRestrictionLevel} will enable certain checks when called. Those methods will OR the check they
 * enable onto the existing bitmask specified by this method. For more details, see the documentation of those
 * methods.
 *
 * @param sc       The USpoofChecker
 * @param checks         The set of checks that this spoof checker will perform.
 *                 The value is a bit set, obtained by OR-ing together
 *                 values from enum USpoofChecks.
 * @param status   The error code, set if this function encounters a problem.
 * @stable ICU 4.2
 *
 */
U_STABLE void U_EXPORT2
uspoof_setChecks(USpoofChecker *sc, int32_t checks, UErrorCode *status);

/**
 * Get the set of checks that this Spoof Checker has been configured to perform.
 *
 * @param sc       The USpoofChecker
 * @param status   The error code, set if this function encounters a problem.
 * @return         The set of checks that this spoof checker will perform.
 *                 The value is a bit set, obtained by OR-ing together
 *                 values from enum USpoofChecks.
 * @stable ICU 4.2
 *
 */
U_STABLE int32_t U_EXPORT2
uspoof_getChecks(const USpoofChecker *sc, UErrorCode *status);

/**
 * Set the loosest restriction level allowed for strings. The default if this is not called is
 * {@link USPOOF_HIGHLY_RESTRICTIVE}. Calling this method enables the {@link USPOOF_RESTRICTION_LEVEL} and
 * {@link USPOOF_MIXED_NUMBERS} checks, corresponding to Sections 5.1 and 5.2 of UTS 39. To customize which checks are
 * to be performed by {@link uspoof_check}, see {@link uspoof_setChecks}.
 *
 * @param sc       The USpoofChecker
 * @param restrictionLevel The loosest restriction level allowed.
 * @see URestrictionLevel
 * @stable ICU 51
 */
U_STABLE void U_EXPORT2
uspoof_setRestrictionLevel(USpoofChecker *sc, URestrictionLevel restrictionLevel);


/**
  * Get the Restriction Level that will be tested if the checks include {@link USPOOF_RESTRICTION_LEVEL}.
  *
  * @return The restriction level
  * @see URestrictionLevel
  * @stable ICU 51
  */
U_STABLE URestrictionLevel U_EXPORT2
uspoof_getRestrictionLevel(const USpoofChecker *sc);

/**
 * Limit characters that are acceptable in identifiers being checked to those
 * normally used with the languages associated with the specified locales.
 * Any previously specified list of locales is replaced by the new settings.
 *
 * A set of languages is determined from the locale(s), and
 * from those a set of acceptable Unicode scripts is determined.
 * Characters from this set of scripts, along with characters from
 * the "common" and "inherited" Unicode Script categories
 * will be permitted.
 *
 * Supplying an empty string removes all restrictions;
 * characters from any script will be allowed.
 *
 * The {@link USPOOF_CHAR_LIMIT} test is automatically enabled for this
 * USpoofChecker when calling this function with a non-empty list
 * of locales.
 *
 * The Unicode Set of characters that will be allowed is accessible
 * via the uspoof_getAllowedChars() function.  uspoof_setAllowedLocales()
 * will <i>replace</i> any previously applied set of allowed characters.
 *
 * Adjustments, such as additions or deletions of certain classes of characters,
 * can be made to the result of uspoof_setAllowedLocales() by
 * fetching the resulting set with uspoof_getAllowedChars(),
 * manipulating it with the Unicode Set API, then resetting the
 * spoof detectors limits with uspoof_setAllowedChars().
 *
 * @param sc           The USpoofChecker
 * @param localesList  A list list of locales, from which the language
 *                     and associated script are extracted.  The locales
 *                     are comma-separated if there is more than one.
 *                     White space may not appear within an individual locale,
 *                     but is ignored otherwise.
 *                     The locales are syntactically like those from the
 *                     HTTP Accept-Language header.
 *                     If the localesList is empty, no restrictions will be placed on
 *                     the allowed characters.
 *
 * @param status       The error code, set if this function encounters a problem.
 * @stable ICU 4.2
 */
U_STABLE void U_EXPORT2
uspoof_setAllowedLocales(USpoofChecker *sc, const char *localesList, UErrorCode *status);

/**
 * Get a list of locales for the scripts that are acceptable in strings
 *  to be checked.  If no limitations on scripts have been specified,
 *  an empty string will be returned.
 *
 *  uspoof_setAllowedChars() will reset the list of allowed to be empty.
 *
 *  The format of the returned list is the same as that supplied to
 *  uspoof_setAllowedLocales(), but returned list may not be identical
 *  to the originally specified string; the string may be reformatted,
 *  and information other than languages from
 *  the originally specified locales may be omitted.
 *
 * @param sc           The USpoofChecker
 * @param status       The error code, set if this function encounters a problem.
 * @return             A string containing a list of  locales corresponding
 *                     to the acceptable scripts, formatted like an
 *                     HTTP Accept Language value.
 *
 * @stable ICU 4.2
 */
U_STABLE const char * U_EXPORT2
uspoof_getAllowedLocales(USpoofChecker *sc, UErrorCode *status);


/**
 * Limit the acceptable characters to those specified by a Unicode Set.
 *   Any previously specified character limit is
 *   is replaced by the new settings.  This includes limits on
 *   characters that were set with the uspoof_setAllowedLocales() function.
 *
 * The USPOOF_CHAR_LIMIT test is automatically enabled for this
 * USpoofChecker by this function.
 *
 * @param sc       The USpoofChecker
 * @param chars    A Unicode Set containing the list of
 *                 characters that are permitted.  Ownership of the set
 *                 remains with the caller.  The incoming set is cloned by
 *                 this function, so there are no restrictions on modifying
 *                 or deleting the USet after calling this function.
 * @param status   The error code, set if this function encounters a problem.
 * @stable ICU 4.2
 */
U_STABLE void U_EXPORT2
uspoof_setAllowedChars(USpoofChecker *sc, const USet *chars, UErrorCode *status);


/**
 * Get a USet for the characters permitted in an identifier.
 * This corresponds to the limits imposed by the Set Allowed Characters
 * functions. Limitations imposed by other checks will not be
 * reflected in the set returned by this function.
 *
 * The returned set will be frozen, meaning that it cannot be modified
 * by the caller.
 *
 * Ownership of the returned set remains with the Spoof Detector.  The
 * returned set will become invalid if the spoof detector is closed,
 * or if a new set of allowed characters is specified.
 *
 *
 * @param sc       The USpoofChecker
 * @param status   The error code, set if this function encounters a problem.
 * @return         A USet containing the characters that are permitted by
 *                 the USPOOF_CHAR_LIMIT test.
 * @stable ICU 4.2
 */
U_STABLE const USet * U_EXPORT2
uspoof_getAllowedChars(const USpoofChecker *sc, UErrorCode *status);


/**
 * Check the specified string for possible security issues.
 * The text to be checked will typically be an identifier of some sort.
 * The set of checks to be performed is specified with uspoof_setChecks().
 *
 * \note
 *   Consider using the newer API, {@link uspoof_check2}, instead.
 *   The newer API exposes additional information from the check procedure
 *   and is otherwise identical to this method.
 *
 * @param sc      The USpoofChecker
 * @param id      The identifier to be checked for possible security issues,
 *                in UTF-16 format.
 * @param length  the length of the string to be checked, expressed in
 *                16 bit UTF-16 code units, or -1 if the string is
 *                zero terminated.
 * @param position  Deprecated in ICU 51.  Always returns zero.
 *                Originally, an out parameter for the index of the first
 *                string position that failed a check.
 *                This parameter may be NULL.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 *                Spoofing or security issues detected with the input string are
 *                not reported here, but through the function's return value.
 * @return        An integer value with bits set for any potential security
 *                or spoofing issues detected.  The bits are defined by
 *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
 *                will be zero if the input string passes all of the
 *                enabled checks.
 * @see uspoof_check2
 * @stable ICU 4.2
 */
U_STABLE int32_t U_EXPORT2
uspoof_check(const USpoofChecker *sc,
                         const UChar *id, int32_t length,
                         int32_t *position,
                         UErrorCode *status);


/**
 * Check the specified string for possible security issues.
 * The text to be checked will typically be an identifier of some sort.
 * The set of checks to be performed is specified with uspoof_setChecks().
 *
 * \note
 *   Consider using the newer API, {@link uspoof_check2UTF8}, instead.
 *   The newer API exposes additional information from the check procedure
 *   and is otherwise identical to this method.
 *
 * @param sc      The USpoofChecker
 * @param id      A identifier to be checked for possible security issues, in UTF8 format.
 * @param length  the length of the string to be checked, or -1 if the string is
 *                zero terminated.
 * @param position  Deprecated in ICU 51.  Always returns zero.
 *                Originally, an out parameter for the index of the first
 *                string position that failed a check.
 *                This parameter may be NULL.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 *                Spoofing or security issues detected with the input string are
 *                not reported here, but through the function's return value.
 *                If the input contains invalid UTF-8 sequences,
 *                a status of U_INVALID_CHAR_FOUND will be returned.
 * @return        An integer value with bits set for any potential security
 *                or spoofing issues detected.  The bits are defined by
 *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
 *                will be zero if the input string passes all of the
 *                enabled checks.
 * @see uspoof_check2UTF8
 * @stable ICU 4.2
 */
U_STABLE int32_t U_EXPORT2
uspoof_checkUTF8(const USpoofChecker *sc,
                 const char *id, int32_t length,
                 int32_t *position,
                 UErrorCode *status);


/**
 * Check the specified string for possible security issues.
 * The text to be checked will typically be an identifier of some sort.
 * The set of checks to be performed is specified with uspoof_setChecks().
 *
 * @param sc      The USpoofChecker
 * @param id      The identifier to be checked for possible security issues,
 *                in UTF-16 format.
 * @param length  the length of the string to be checked, or -1 if the string is
 *                zero terminated.
 * @param checkResult  An instance of USpoofCheckResult to be filled with
 *                details about the identifier.  Can be NULL.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 *                Spoofing or security issues detected with the input string are
 *                not reported here, but through the function's return value.
 * @return        An integer value with bits set for any potential security
 *                or spoofing issues detected.  The bits are defined by
 *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
 *                will be zero if the input string passes all of the
 *                enabled checks.  Any information in this bitmask will be
 *                consistent with the information saved in the optional
 *                checkResult parameter.
 * @see uspoof_openCheckResult
 * @see uspoof_check2UTF8
 * @see uspoof_check2UnicodeString
 * @stable ICU 58
 */
U_STABLE int32_t U_EXPORT2
uspoof_check2(const USpoofChecker *sc,
    const UChar* id, int32_t length,
    USpoofCheckResult* checkResult,
    UErrorCode *status);

/**
 * Check the specified string for possible security issues.
 * The text to be checked will typically be an identifier of some sort.
 * The set of checks to be performed is specified with uspoof_setChecks().
 *
 * This version of {@link uspoof_check} accepts a USpoofCheckResult, which
 * returns additional information about the identifier.  For more
 * information, see {@link uspoof_openCheckResult}.
 *
 * @param sc      The USpoofChecker
 * @param id      A identifier to be checked for possible security issues, in UTF8 format.
 * @param length  the length of the string to be checked, or -1 if the string is
 *                zero terminated.
 * @param checkResult  An instance of USpoofCheckResult to be filled with
 *                details about the identifier.  Can be NULL.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 *                Spoofing or security issues detected with the input string are
 *                not reported here, but through the function's return value.
 * @return        An integer value with bits set for any potential security
 *                or spoofing issues detected.  The bits are defined by
 *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
 *                will be zero if the input string passes all of the
 *                enabled checks.  Any information in this bitmask will be
 *                consistent with the information saved in the optional
 *                checkResult parameter.
 * @see uspoof_openCheckResult
 * @see uspoof_check2
 * @see uspoof_check2UnicodeString
 * @stable ICU 58
 */
U_STABLE int32_t U_EXPORT2
uspoof_check2UTF8(const USpoofChecker *sc,
    const char *id, int32_t length,
    USpoofCheckResult* checkResult,
    UErrorCode *status);

/**
 * Create a USpoofCheckResult, used by the {@link uspoof_check2} class of functions to return
 * information about the identifier.  Information includes:
 * <ul>
 *   <li>A bitmask of the checks that failed</li>
 *   <li>The identifier's restriction level (UTS 39 section 5.2)</li>
 *   <li>The set of numerics in the string (UTS 39 section 5.3)</li>
 * </ul>
 * The data held in a USpoofCheckResult is cleared whenever it is passed into a new call
 * of {@link uspoof_check2}.
 *
 * @param status  The error code, set if this function encounters a problem.
 * @return        the newly created USpoofCheckResult
 * @see uspoof_check2
 * @see uspoof_check2UTF8
 * @see uspoof_check2UnicodeString
 * @stable ICU 58
 */
U_STABLE USpoofCheckResult* U_EXPORT2
uspoof_openCheckResult(UErrorCode *status);

/**
 * Close a USpoofCheckResult, freeing any memory that was being held by
 *   its implementation.
 *
 * @param checkResult  The instance of USpoofCheckResult to close
 * @stable ICU 58
 */
U_STABLE void U_EXPORT2
uspoof_closeCheckResult(USpoofCheckResult *checkResult);

/**
 * Indicates which of the spoof check(s) have failed. The value is a bitwise OR of the constants for the tests
 * in question: USPOOF_RESTRICTION_LEVEL, USPOOF_CHAR_LIMIT, and so on.
 *
 * @param checkResult  The instance of USpoofCheckResult created by {@link uspoof_openCheckResult}
 * @param status       The error code, set if an error occurred.
 * @return        An integer value with bits set for any potential security
 *                or spoofing issues detected.  The bits are defined by
 *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
 *                will be zero if the input string passes all of the
 *                enabled checks.
 * @see uspoof_setChecks
 * @stable ICU 58
 */
U_STABLE int32_t U_EXPORT2
uspoof_getCheckResultChecks(const USpoofCheckResult *checkResult, UErrorCode *status);

/**
 * Gets the restriction level that the text meets, if the USPOOF_RESTRICTION_LEVEL check
 * was enabled; otherwise, undefined.
 *
 * @param checkResult  The instance of USpoofCheckResult created by {@link uspoof_openCheckResult}
 * @param status       The error code, set if an error occurred.
 * @return             The restriction level contained in the USpoofCheckResult
 * @see uspoof_setRestrictionLevel
 * @stable ICU 58
 */
U_STABLE URestrictionLevel U_EXPORT2
uspoof_getCheckResultRestrictionLevel(const USpoofCheckResult *checkResult, UErrorCode *status);

/**
 * Gets the set of numerics found in the string, if the USPOOF_MIXED_NUMBERS check was enabled;
 * otherwise, undefined.  The set will contain the zero digit from each decimal number system found
 * in the input string.  Ownership of the returned USet remains with the USpoofCheckResult.
 * The USet will be free'd when {@link uspoof_closeCheckResult} is called.
 *
 * @param checkResult  The instance of USpoofCheckResult created by {@link uspoof_openCheckResult}
 * @return             The set of numerics contained in the USpoofCheckResult
 * @param status       The error code, set if an error occurred.
 * @stable ICU 58
 */
U_STABLE const USet* U_EXPORT2
uspoof_getCheckResultNumerics(const USpoofCheckResult *checkResult, UErrorCode *status);


/**
 * Check the whether two specified strings are visually confusable.
 *
 * If the strings are confusable, the return value will be nonzero, as long as
 * {@link USPOOF_CONFUSABLE} was enabled in uspoof_setChecks().
 *
 * The bits in the return value correspond to flags for each of the classes of
 * confusables applicable to the two input strings.  According to UTS 39
 * section 4, the possible flags are:
 *
 * <ul>
 *   <li>{@link USPOOF_SINGLE_SCRIPT_CONFUSABLE}</li>
 *   <li>{@link USPOOF_MIXED_SCRIPT_CONFUSABLE}</li>
 *   <li>{@link USPOOF_WHOLE_SCRIPT_CONFUSABLE}</li>
 * </ul>
 *
 * If one or more of the above flags were not listed in uspoof_setChecks(), this
 * function will never report that class of confusable.  The check
 * {@link USPOOF_CONFUSABLE} enables all three flags.
 *
 *
 * @param sc      The USpoofChecker
 * @param id1     The first of the two identifiers to be compared for
 *                confusability.  The strings are in UTF-16 format.
 * @param length1 the length of the first identifer, expressed in
 *                16 bit UTF-16 code units, or -1 if the string is
 *                nul terminated.
 * @param id2     The second of the two identifiers to be compared for
 *                confusability.  The identifiers are in UTF-16 format.
 * @param length2 The length of the second identifiers, expressed in
 *                16 bit UTF-16 code units, or -1 if the string is
 *                nul terminated.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 *                Confusability of the identifiers is not reported here,
 *                but through this function's return value.
 * @return        An integer value with bit(s) set corresponding to
 *                the type of confusability found, as defined by
 *                enum USpoofChecks.  Zero is returned if the identifiers
 *                are not confusable.
 *
 * @stable ICU 4.2
 */
U_STABLE int32_t U_EXPORT2
uspoof_areConfusable(const USpoofChecker *sc,
                     const UChar *id1, int32_t length1,
                     const UChar *id2, int32_t length2,
                     UErrorCode *status);



/**
 * A version of {@link uspoof_areConfusable} accepting strings in UTF-8 format.
 *
 * @param sc      The USpoofChecker
 * @param id1     The first of the two identifiers to be compared for
 *                confusability.  The strings are in UTF-8 format.
 * @param length1 the length of the first identifiers, in bytes, or -1
 *                if the string is nul terminated.
 * @param id2     The second of the two identifiers to be compared for
 *                confusability.  The strings are in UTF-8 format.
 * @param length2 The length of the second string in bytes, or -1
 *                if the string is nul terminated.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 *                Confusability of the strings is not reported here,
 *                but through this function's return value.
 * @return        An integer value with bit(s) set corresponding to
 *                the type of confusability found, as defined by
 *                enum USpoofChecks.  Zero is returned if the strings
 *                are not confusable.
 *
 * @stable ICU 4.2
 *
 * @see uspoof_areConfusable
 */
U_STABLE int32_t U_EXPORT2
uspoof_areConfusableUTF8(const USpoofChecker *sc,
                         const char *id1, int32_t length1,
                         const char *id2, int32_t length2,
                         UErrorCode *status);




/**
 *  Get the "skeleton" for an identifier.
 *  Skeletons are a transformation of the input identifier;
 * Two identifiers are confusable if their skeletons are identical.
 *  See Unicode UAX #39 for additional information.
 *
 *  Using skeletons directly makes it possible to quickly check
 *  whether an identifier is confusable with any of some large
 *  set of existing identifiers, by creating an efficiently
 *  searchable collection of the skeletons.
 *
 * @param sc      The USpoofChecker
 * @param type    Deprecated in ICU 58.  You may pass any number.
 *                Originally, controlled which of the Unicode confusable data
 *                tables to use.
 * @param id      The input identifier whose skeleton will be computed.
 * @param length  The length of the input identifier, expressed in 16 bit
 *                UTF-16 code units, or -1 if the string is zero terminated.
 * @param dest    The output buffer, to receive the skeleton string.
 * @param destCapacity  The length of the output buffer, in 16 bit units.
 *                The destCapacity may be zero, in which case the function will
 *                return the actual length of the skeleton.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 * @return        The length of the skeleton string.  The returned length
 *                is always that of the complete skeleton, even when the
 *                supplied buffer is too small (or of zero length)
 *
 * @stable ICU 4.2
 * @see uspoof_areConfusable
 */
U_STABLE int32_t U_EXPORT2
uspoof_getSkeleton(const USpoofChecker *sc,
                   uint32_t type,
                   const UChar *id,  int32_t length,
                   UChar *dest, int32_t destCapacity,
                   UErrorCode *status);

/**
 *  Get the "skeleton" for an identifier.
 *  Skeletons are a transformation of the input identifier;
 *  Two identifiers are confusable if their skeletons are identical.
 *  See Unicode UAX #39 for additional information.
 *
 *  Using skeletons directly makes it possible to quickly check
 *  whether an identifier is confusable with any of some large
 *  set of existing identifiers, by creating an efficiently
 *  searchable collection of the skeletons.
 *
 * @param sc      The USpoofChecker
 * @param type    Deprecated in ICU 58.  You may pass any number.
 *                Originally, controlled which of the Unicode confusable data
 *                tables to use.
 * @param id      The UTF-8 format identifier whose skeleton will be computed.
 * @param length  The length of the input string, in bytes,
 *                or -1 if the string is zero terminated.
 * @param dest    The output buffer, to receive the skeleton string.
 * @param destCapacity  The length of the output buffer, in bytes.
 *                The destCapacity may be zero, in which case the function will
 *                return the actual length of the skeleton.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.  Possible Errors include U_INVALID_CHAR_FOUND
 *                   for invalid UTF-8 sequences, and
 *                   U_BUFFER_OVERFLOW_ERROR if the destination buffer is too small
 *                   to hold the complete skeleton.
 * @return        The length of the skeleton string, in bytes.  The returned length
 *                is always that of the complete skeleton, even when the
 *                supplied buffer is too small (or of zero length)
 *
 * @stable ICU 4.2
 */
U_STABLE int32_t U_EXPORT2
uspoof_getSkeletonUTF8(const USpoofChecker *sc,
                       uint32_t type,
                       const char *id,  int32_t length,
                       char *dest, int32_t destCapacity,
                       UErrorCode *status);

/**
  * Get the set of Candidate Characters for Inclusion in Identifiers, as defined
  * in http://unicode.org/Public/security/latest/xidmodifications.txt
  * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms.
  *
  * The returned set is frozen. Ownership of the set remains with the ICU library; it must not
  * be deleted by the caller.
  *
  * @param status The error code, set if a problem occurs while creating the set.
  *
  * @stable ICU 51
  */
U_STABLE const USet * U_EXPORT2
uspoof_getInclusionSet(UErrorCode *status);

/**
  * Get the set of characters from Recommended Scripts for Inclusion in Identifiers, as defined
  * in http://unicode.org/Public/security/latest/xidmodifications.txt
  * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms.
  *
  * The returned set is frozen. Ownership of the set remains with the ICU library; it must not
  * be deleted by the caller.
  *
  * @param status The error code, set if a problem occurs while creating the set.
  *
  * @stable ICU 51
  */
U_STABLE const USet * U_EXPORT2
uspoof_getRecommendedSet(UErrorCode *status);

/**
 * Serialize the data for a spoof detector into a chunk of memory.
 * The flattened spoof detection tables can later be used to efficiently
 * instantiate a new Spoof Detector.
 *
 * The serialized spoof checker includes only the data compiled from the
 * Unicode data tables by uspoof_openFromSource(); it does not include
 * include any other state or configuration that may have been set.
 *
 * @param sc   the Spoof Detector whose data is to be serialized.
 * @param data a pointer to 32-bit-aligned memory to be filled with the data,
 *             can be NULL if capacity==0
 * @param capacity the number of bytes available at data,
 *                 or 0 for preflighting
 * @param status an in/out ICU UErrorCode; possible errors include:
 * - U_BUFFER_OVERFLOW_ERROR if the data storage block is too small for serialization
 * - U_ILLEGAL_ARGUMENT_ERROR  the data or capacity parameters are bad
 * @return the number of bytes written or needed for the spoof data
 *
 * @see utrie2_openFromSerialized()
 * @stable ICU 4.2
 */
U_STABLE int32_t U_EXPORT2
uspoof_serialize(USpoofChecker *sc,
                 void *data, int32_t capacity,
                 UErrorCode *status);

U_CDECL_END

#if U_SHOW_CPLUSPLUS_API

U_NAMESPACE_BEGIN

/**
 * \class LocalUSpoofCheckerPointer
 * "Smart pointer" class, closes a USpoofChecker via uspoof_close().
 * For most methods see the LocalPointerBase base class.
 *
 * @see LocalPointerBase
 * @see LocalPointer
 * @stable ICU 4.4
 */
/**
 * \cond
 * Note: Doxygen is giving a bogus warning on this U_DEFINE_LOCAL_OPEN_POINTER.
 *       For now, suppress with a Doxygen cond
 */
U_DEFINE_LOCAL_OPEN_POINTER(LocalUSpoofCheckerPointer, USpoofChecker, uspoof_close);
/** \endcond */

/**
 * \class LocalUSpoofCheckResultPointer
 * "Smart pointer" class, closes a USpoofCheckResult via `uspoof_closeCheckResult()`.
 * For most methods see the LocalPointerBase base class.
 *
 * @see LocalPointerBase
 * @see LocalPointer
 * @stable ICU 58
 */

/**
 * \cond
 * Note: Doxygen is giving a bogus warning on this U_DEFINE_LOCAL_OPEN_POINTER.
 *       For now, suppress with a Doxygen cond
 */
U_DEFINE_LOCAL_OPEN_POINTER(LocalUSpoofCheckResultPointer, USpoofCheckResult, uspoof_closeCheckResult);
/** \endcond */

U_NAMESPACE_END

/**
 * Limit the acceptable characters to those specified by a Unicode Set.
 *   Any previously specified character limit is
 *   is replaced by the new settings.    This includes limits on
 *   characters that were set with the uspoof_setAllowedLocales() function.
 *
 * The USPOOF_CHAR_LIMIT test is automatically enabled for this
 * USoofChecker by this function.
 *
 * @param sc       The USpoofChecker
 * @param chars    A Unicode Set containing the list of
 *                 characters that are permitted.  Ownership of the set
 *                 remains with the caller.  The incoming set is cloned by
 *                 this function, so there are no restrictions on modifying
 *                 or deleting the UnicodeSet after calling this function.
 * @param status   The error code, set if this function encounters a problem.
 * @stable ICU 4.2
 */
U_STABLE void U_EXPORT2
uspoof_setAllowedUnicodeSet(USpoofChecker *sc, const icu::UnicodeSet *chars, UErrorCode *status);


/**
 * Get a UnicodeSet for the characters permitted in an identifier.
 * This corresponds to the limits imposed by the Set Allowed Characters /
 * UnicodeSet functions. Limitations imposed by other checks will not be
 * reflected in the set returned by this function.
 *
 * The returned set will be frozen, meaning that it cannot be modified
 * by the caller.
 *
 * Ownership of the returned set remains with the Spoof Detector.  The
 * returned set will become invalid if the spoof detector is closed,
 * or if a new set of allowed characters is specified.
 *
 *
 * @param sc       The USpoofChecker
 * @param status   The error code, set if this function encounters a problem.
 * @return         A UnicodeSet containing the characters that are permitted by
 *                 the USPOOF_CHAR_LIMIT test.
 * @stable ICU 4.2
 */
U_STABLE const icu::UnicodeSet * U_EXPORT2
uspoof_getAllowedUnicodeSet(const USpoofChecker *sc, UErrorCode *status);

/**
 * Check the specified string for possible security issues.
 * The text to be checked will typically be an identifier of some sort.
 * The set of checks to be performed is specified with uspoof_setChecks().
 *
 * \note
 *   Consider using the newer API, {@link uspoof_check2UnicodeString}, instead.
 *   The newer API exposes additional information from the check procedure
 *   and is otherwise identical to this method.
 *
 * @param sc      The USpoofChecker
 * @param id      A identifier to be checked for possible security issues.
 * @param position  Deprecated in ICU 51.  Always returns zero.
 *                Originally, an out parameter for the index of the first
 *                string position that failed a check.
 *                This parameter may be NULL.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 *                Spoofing or security issues detected with the input string are
 *                not reported here, but through the function's return value.
 * @return        An integer value with bits set for any potential security
 *                or spoofing issues detected.  The bits are defined by
 *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
 *                will be zero if the input string passes all of the
 *                enabled checks.
 * @see uspoof_check2UnicodeString
 * @stable ICU 4.2
 */
U_STABLE int32_t U_EXPORT2
uspoof_checkUnicodeString(const USpoofChecker *sc,
                          const icu::UnicodeString &id,
                          int32_t *position,
                          UErrorCode *status);

/**
 * Check the specified string for possible security issues.
 * The text to be checked will typically be an identifier of some sort.
 * The set of checks to be performed is specified with uspoof_setChecks().
 *
 * @param sc      The USpoofChecker
 * @param id      A identifier to be checked for possible security issues.
 * @param checkResult  An instance of USpoofCheckResult to be filled with
 *                details about the identifier.  Can be NULL.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 *                Spoofing or security issues detected with the input string are
 *                not reported here, but through the function's return value.
 * @return        An integer value with bits set for any potential security
 *                or spoofing issues detected.  The bits are defined by
 *                enum USpoofChecks.  (returned_value & USPOOF_ALL_CHECKS)
 *                will be zero if the input string passes all of the
 *                enabled checks.  Any information in this bitmask will be
 *                consistent with the information saved in the optional
 *                checkResult parameter.
 * @see uspoof_openCheckResult
 * @see uspoof_check2
 * @see uspoof_check2UTF8
 * @stable ICU 58
 */
U_STABLE int32_t U_EXPORT2
uspoof_check2UnicodeString(const USpoofChecker *sc,
    const icu::UnicodeString &id,
    USpoofCheckResult* checkResult,
    UErrorCode *status);

/**
 * A version of {@link uspoof_areConfusable} accepting UnicodeStrings.
 *
 * @param sc      The USpoofChecker
 * @param s1     The first of the two identifiers to be compared for
 *                confusability.  The strings are in UTF-8 format.
 * @param s2     The second of the two identifiers to be compared for
 *                confusability.  The strings are in UTF-8 format.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 *                Confusability of the identifiers is not reported here,
 *                but through this function's return value.
 * @return        An integer value with bit(s) set corresponding to
 *                the type of confusability found, as defined by
 *                enum USpoofChecks.  Zero is returned if the identifiers
 *                are not confusable.
 *
 * @stable ICU 4.2
 *
 * @see uspoof_areConfusable
 */
U_STABLE int32_t U_EXPORT2
uspoof_areConfusableUnicodeString(const USpoofChecker *sc,
                                  const icu::UnicodeString &s1,
                                  const icu::UnicodeString &s2,
                                  UErrorCode *status);

/**
 *  Get the "skeleton" for an identifier.
 *  Skeletons are a transformation of the input identifier;
 *  Two identifiers are confusable if their skeletons are identical.
 *  See Unicode UAX #39 for additional information.
 *
 *  Using skeletons directly makes it possible to quickly check
 *  whether an identifier is confusable with any of some large
 *  set of existing identifiers, by creating an efficiently
 *  searchable collection of the skeletons.
 *
 * @param sc      The USpoofChecker.
 * @param type    Deprecated in ICU 58.  You may pass any number.
 *                Originally, controlled which of the Unicode confusable data
 *                tables to use.
 * @param id      The input identifier whose skeleton will be computed.
 * @param dest    The output identifier, to receive the skeleton string.
 * @param status  The error code, set if an error occurred while attempting to
 *                perform the check.
 * @return        A reference to the destination (skeleton) string.
 *
 * @stable ICU 4.2
 */
U_I18N_API icu::UnicodeString & U_EXPORT2
uspoof_getSkeletonUnicodeString(const USpoofChecker *sc,
                                uint32_t type,
                                const icu::UnicodeString &id,
                                icu::UnicodeString &dest,
                                UErrorCode *status);

/**
  * Get the set of Candidate Characters for Inclusion in Identifiers, as defined
  * in http://unicode.org/Public/security/latest/xidmodifications.txt
  * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms.
  *
  * The returned set is frozen. Ownership of the set remains with the ICU library; it must not
  * be deleted by the caller.
  *
  * @param status The error code, set if a problem occurs while creating the set.
  *
  * @stable ICU 51
  */
U_STABLE const icu::UnicodeSet * U_EXPORT2
uspoof_getInclusionUnicodeSet(UErrorCode *status);

/**
  * Get the set of characters from Recommended Scripts for Inclusion in Identifiers, as defined
  * in http://unicode.org/Public/security/latest/xidmodifications.txt
  * and documented in http://www.unicode.org/reports/tr39/, Unicode Security Mechanisms.
  *
  * The returned set is frozen. Ownership of the set remains with the ICU library; it must not
  * be deleted by the caller.
  *
  * @param status The error code, set if a problem occurs while creating the set.
  *
  * @stable ICU 51
  */
U_STABLE const icu::UnicodeSet * U_EXPORT2
uspoof_getRecommendedUnicodeSet(UErrorCode *status);

#endif /* U_SHOW_CPLUSPLUS_API */

#endif /* UCONFIG_NO_NORMALIZATION */

#endif   /* USPOOF_H */