summaryrefslogtreecommitdiffstats
path: root/src/corelib/codecs/qtextcodec.cpp
blob: b015c914ebcbd10f82eff80f3befcca3c12b493d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
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
1575
1576
1577
1578
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qplatformdefs.h"
#include "qtextcodec.h"
#include "qtextcodec_p.h"

#ifndef QT_NO_TEXTCODEC

#include "qlist.h"
#include "qfile.h"
#include "qstringlist.h"
#include "qvarlengtharray.h"
#if !defined(QT_BOOTSTRAPPED)
#include <private/qcoreapplication_p.h>
#endif

#ifdef Q_OS_UNIX
#  include "qiconvcodec_p.h"
#endif

#include "qutfcodec_p.h"
#include "qsimplecodec_p.h"
#include "qlatincodec_p.h"
#ifndef QT_NO_CODECS
#  include "qtsciicodec_p.h"
#  include "qisciicodec_p.h"
#if !defined(Q_OS_INTEGRITY)
#  if !defined(QT_BOOTSTRAPPED)
#    include "qgb18030codec_p.h"
#    include "qeucjpcodec_p.h"
#    include "qjiscodec_p.h"
#    include "qsjiscodec_p.h"
#    include "qeuckrcodec_p.h"
#    include "qbig5codec_p.h"
#  endif // !QT_BOOTSTRAPPED
#  if defined(Q_OS_UNIX) && !defined(QT_BOOTSTRAPPED)
#    include "qfontlaocodec_p.h"
#    include "qfontjpcodec_p.h"
#  endif
#endif // !Q_OS_INTEGRITY
#endif // QT_NO_CODECS
#include "qlocale.h"
#include "qmutex.h"
#include "qhash.h"

#include <stdlib.h>
#include <ctype.h>
#include <locale.h>
#if defined (_XOPEN_UNIX) && !defined(Q_OS_QNX) && !defined(Q_OS_OSF) && !defined(Q_OS_LINUX_ANDROID)
# include <langinfo.h>
#endif

#ifdef Q_OS_WIN
#  include <qt_windows.h>
#  if defined(Q_OS_WINCE)
#    define QT_NO_SETLOCALE
#  endif
#endif


// enabling this is not exception safe!
// #define Q_DEBUG_TEXTCODEC

QT_BEGIN_NAMESPACE

//Cache for QTextCodec::codecForName and codecForMib.
typedef QHash<QByteArray, QTextCodec *> QTextCodecCache;
Q_GLOBAL_STATIC(QTextCodecCache, qTextCodecCache)


static char qtolower(register char c)
{ if (c >= 'A' && c <= 'Z') return c + 0x20; return c; }
static bool qisalnum(register char c)
{ return (c >= '0' && c <= '9') || ((c | 0x20) >= 'a' && (c | 0x20) <= 'z'); }

static bool nameMatch(const QByteArray &name, const QByteArray &test)
{
    // if they're the same, return a perfect score
    if (qstricmp(name.constData(), test.constData()) == 0)
        return true;

    const char *n = name.constData();
    const char *h = test.constData();

    // if the letters and numbers are the same, we have a match
    while (*n != '\0') {
        if (qisalnum(*n)) {
            for (;;) {
                if (*h == '\0')
                    return false;
                if (qisalnum(*h))
                    break;
                ++h;
            }
            if (qtolower(*n) != qtolower(*h))
                return false;
            ++h;
        }
        ++n;
    }
    while (*h && !qisalnum(*h))
           ++h;
    return (*h == '\0');
}


static QList<QTextCodec*> *all = 0;
#ifdef Q_DEBUG_TEXTCODEC
static bool destroying_is_ok = false;
#endif

static QTextCodec *localeMapper = 0;

class QTextCodecCleanup
{
public:
    ~QTextCodecCleanup();
};

/*
    Deletes all the created codecs. This destructor is called just
    before exiting to delete any QTextCodec objects that may be lying
    around.
*/
QTextCodecCleanup::~QTextCodecCleanup()
{
    if (!all)
        return;

#ifdef Q_DEBUG_TEXTCODEC
    destroying_is_ok = true;
#endif

    QList<QTextCodec *> *myAll = all;
    all = 0; // Otherwise the d'tor destroys the iterator
    for (QList<QTextCodec *>::const_iterator it = myAll->constBegin()
            ; it != myAll->constEnd(); ++it) {
        delete *it;
    }
    delete myAll;
    localeMapper = 0;

#ifdef Q_DEBUG_TEXTCODEC
    destroying_is_ok = false;
#endif
}

Q_GLOBAL_STATIC(QTextCodecCleanup, createQTextCodecCleanup)

bool QTextCodec::validCodecs()
{
    return true;
}


#if defined(Q_OS_WIN32) || defined(Q_OS_WINCE)
class QWindowsLocalCodec: public QTextCodec
{
public:
    QWindowsLocalCodec();
    ~QWindowsLocalCodec();

    QString convertToUnicode(const char *, int, ConverterState *) const;
    QByteArray convertFromUnicode(const QChar *, int, ConverterState *) const;
    QString convertToUnicodeCharByChar(const char *chars, int length, ConverterState *state) const;

    QByteArray name() const;
    int mibEnum() const;

};

QWindowsLocalCodec::QWindowsLocalCodec()
{
}

QWindowsLocalCodec::~QWindowsLocalCodec()
{
}

QString QWindowsLocalCodec::convertToUnicode(const char *chars, int length, ConverterState *state) const
{
    const char *mb = chars;
    int mblen = length;

    if (!mb || !mblen)
        return QString();

    QVarLengthArray<wchar_t, 4096> wc(4096);
    int len;
    QString sp;
    bool prepend = false;
    char state_data = 0;
    int remainingChars = 0;

    //save the current state information
    if (state) {
        state_data = (char)state->state_data[0];
        remainingChars = state->remainingChars;
    }

    //convert the pending charcter (if available)
    if (state && remainingChars) {
        char prev[3] = {0};
        prev[0] = state_data;
        prev[1] = mb[0];
        remainingChars = 0;
        len = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED,
                                    prev, 2, wc.data(), wc.length());
        if (len) {
            prepend = true;
            sp.append(QChar(wc[0]));
            mb++;
            mblen--;
            wc[0] = 0;
        }
    }

    while (!(len=MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED|MB_ERR_INVALID_CHARS,
                mb, mblen, wc.data(), wc.length()))) {
        int r = GetLastError();
        if (r == ERROR_INSUFFICIENT_BUFFER) {
                const int wclen = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED,
                                    mb, mblen, 0, 0);
                wc.resize(wclen);
        } else if (r == ERROR_NO_UNICODE_TRANSLATION) {
            //find the last non NULL character
            while (mblen > 1  && !(mb[mblen-1]))
                mblen--;
            //check whether,  we hit an invalid character in the middle
            if ((mblen <= 1) || (remainingChars && state_data))
                return convertToUnicodeCharByChar(chars, length, state);
            //Remove the last character and try again...
            state_data = mb[mblen-1];
            remainingChars = 1;
            mblen--;
        } else {
            // Fail.
            qWarning("MultiByteToWideChar: Cannot convert multibyte text");
            break;
        }
    }

    if (len <= 0)
        return QString();

    if (wc[len-1] == 0) // len - 1: we don't want terminator
        --len;

    //save the new state information
    if (state) {
        state->state_data[0] = (char)state_data;
        state->remainingChars = remainingChars;
    }
    QString s((QChar*)wc.data(), len);
    if (prepend) {
        return sp+s;
    }
    return s;
}

QString QWindowsLocalCodec::convertToUnicodeCharByChar(const char *chars, int length, ConverterState *state) const
{
    if (!chars || !length)
        return QString();

    int copyLocation = 0;
    int extra = 2;
    if (state && state->remainingChars) {
        copyLocation = state->remainingChars;
        extra += copyLocation;
    }
    int newLength = length + extra;
    char *mbcs = new char[newLength];
    //ensure that we have a NULL terminated string
    mbcs[newLength-1] = 0;
    mbcs[newLength-2] = 0;
    memcpy(&(mbcs[copyLocation]), chars, length);
    if (copyLocation) {
        //copy the last character from the state
        mbcs[0] = (char)state->state_data[0];
        state->remainingChars = 0;
    }
    const char *mb = mbcs;
#ifndef Q_OS_WINCE
    const char *next = 0;
    QString s;
    while((next = CharNextExA(CP_ACP, mb, 0)) != mb) {
        wchar_t wc[2] ={0};
        int charlength = next - mb;
        int len = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED|MB_ERR_INVALID_CHARS, mb, charlength, wc, 2);
        if (len>0) {
            s.append(QChar(wc[0]));
        } else {
            int r = GetLastError();
            //check if the character being dropped is the last character
            if (r == ERROR_NO_UNICODE_TRANSLATION && mb == (mbcs+newLength -3) && state) {
                state->remainingChars = 1;
                state->state_data[0] = (char)*mb;
            }
        }
        mb = next;
    }
#else
    QString s;
    int size = mbstowcs(NULL, mb, length);
    if (size < 0) {
        Q_ASSERT("Error in CE TextCodec");
        return QString();
    }
    wchar_t* ws = new wchar_t[size + 2];
    ws[size +1] = 0;
    ws[size] = 0;
    size = mbstowcs(ws, mb, length);
    for (int i=0; i< size; i++)
        s.append(QChar(ws[i]));
    delete [] ws;
#endif
    delete [] mbcs;
    return s;
}

QByteArray QWindowsLocalCodec::convertFromUnicode(const QChar *ch, int uclen, ConverterState *) const
{
    if (!ch)
        return QByteArray();
    if (uclen == 0)
        return QByteArray("");
    BOOL used_def;
    QByteArray mb(4096, 0);
    int len;
    while (!(len=WideCharToMultiByte(CP_ACP, 0, (const wchar_t*)ch, uclen,
                mb.data(), mb.size()-1, 0, &used_def)))
    {
        int r = GetLastError();
        if (r == ERROR_INSUFFICIENT_BUFFER) {
            mb.resize(1+WideCharToMultiByte(CP_ACP, 0,
                                (const wchar_t*)ch, uclen,
                                0, 0, 0, &used_def));
                // and try again...
        } else {
#ifndef QT_NO_DEBUG
            // Fail.
            qWarning("WideCharToMultiByte: Cannot convert multibyte text (error %d): %s (UTF-8)",
                r, QString(ch, uclen).toLocal8Bit().data());
#endif
            break;
        }
    }
    mb.resize(len);
    return mb;
}


QByteArray QWindowsLocalCodec::name() const
{
    return "System";
}

int QWindowsLocalCodec::mibEnum() const
{
    return 0;
}

#else

/* locale names mostly copied from XFree86 */
static const char * const iso8859_2locales[] = {
    "croatian", "cs", "cs_CS", "cs_CZ","cz", "cz_CZ", "czech", "hr",
    "hr_HR", "hu", "hu_HU", "hungarian", "pl", "pl_PL", "polish", "ro",
    "ro_RO", "rumanian", "serbocroatian", "sh", "sh_SP", "sh_YU", "sk",
    "sk_SK", "sl", "sl_CS", "sl_SI", "slovak", "slovene", "sr_SP", 0 };

static const char * const iso8859_3locales[] = {
    "eo", 0 };

static const char * const iso8859_4locales[] = {
    "ee", "ee_EE", 0 };

static const char * const iso8859_5locales[] = {
    "mk", "mk_MK", "sp", "sp_YU", 0 };

static const char * const cp_1251locales[] = {
    "be", "be_BY", "bg", "bg_BG", "bulgarian", 0 };

static const char * const pt_154locales[] = {
    "ba_RU", "ky", "ky_KG", "kk", "kk_KZ", 0 };

static const char * const iso8859_6locales[] = {
    "ar_AA", "ar_SA", "arabic", 0 };

static const char * const iso8859_7locales[] = {
    "el", "el_GR", "greek", 0 };

static const char * const iso8859_8locales[] = {
    "hebrew", "he", "he_IL", "iw", "iw_IL", 0 };

static const char * const iso8859_9locales[] = {
    "tr", "tr_TR", "turkish", 0 };

static const char * const iso8859_13locales[] = {
    "lt", "lt_LT", "lv", "lv_LV", 0 };

static const char * const iso8859_15locales[] = {
    "et", "et_EE",
    // Euro countries
    "br_FR", "ca_ES", "de", "de_AT", "de_BE", "de_DE", "de_LU", "en_IE",
    "es", "es_ES", "eu_ES", "fi", "fi_FI", "finnish", "fr", "fr_FR",
    "fr_BE", "fr_LU", "french", "ga_IE", "gl_ES", "it", "it_IT", "oc_FR",
    "nl", "nl_BE", "nl_NL", "pt", "pt_PT", "sv_FI", "wa_BE",
    0 };

static const char * const koi8_ulocales[] = {
    "uk", "uk_UA", "ru_UA", "ukrainian", 0 };

static const char * const tis_620locales[] = {
    "th", "th_TH", "thai", 0 };

// static const char * const tcvnlocales[] = {
//     "vi", "vi_VN", 0 };

static bool try_locale_list(const char * const locale[], const QByteArray &lang)
{
    int i;
    for(i=0; locale[i] && lang != locale[i]; i++)
        ;
    return locale[i] != 0;
}

// For the probably_koi8_locales we have to look. the standard says
// these are 8859-5, but almost all Russian users use KOI8-R and
// incorrectly set $LANG to ru_RU. We'll check tolower() to see what
// it thinks ru_RU means.

// If you read the history, it seems that many Russians blame ISO and
// Perestroika for the confusion.
//
// The real bug is that some programs break if the user specifies
// ru_RU.KOI8-R.

static const char * const probably_koi8_rlocales[] = {
    "ru", "ru_SU", "ru_RU", "russian", 0 };

static QTextCodec * ru_RU_hack(const char * i)
{
    QTextCodec * ru_RU_codec = 0;

    QByteArray origlocale(setlocale(LC_CTYPE, i));
    // unicode   koi8r   latin5   name
    // 0x044E    0xC0    0xEE     CYRILLIC SMALL LETTER YU
    // 0x042E    0xE0    0xCE     CYRILLIC CAPITAL LETTER YU
    int latin5 = tolower(0xCE);
    int koi8r = tolower(0xE0);
    if (koi8r == 0xC0 && latin5 != 0xEE) {
        ru_RU_codec = QTextCodec::codecForName("KOI8-R");
    } else if (koi8r != 0xC0 && latin5 == 0xEE) {
        ru_RU_codec = QTextCodec::codecForName("ISO 8859-5");
    } else {
        // something else again... let's assume... *throws dice*
        ru_RU_codec = QTextCodec::codecForName("KOI8-R");
        qWarning("QTextCodec: Using KOI8-R, probe failed (%02x %02x %s)",
                  koi8r, latin5, i);
    }
    setlocale(LC_CTYPE, origlocale.constData());

    return ru_RU_codec;
}

static QTextCodec *checkForCodec(const QByteArray &name) {
    QTextCodec *c = QTextCodec::codecForName(name);
    if (!c) {
        const int index = name.indexOf('@');
        if (index != -1) {
            c = QTextCodec::codecForName(name.left(index));
        }
    }
    return c;
}
#endif

/* the next two functions are implicitely thread safe,
   as they are only called by setup() which uses a mutex.
*/
static void setupLocaleMapper()
{
#if defined(Q_OS_WIN32) || defined(Q_OS_WINCE)
    localeMapper = QTextCodec::codecForName("System");
#else

#if !defined(QT_BOOTSTRAPPED)
    QCoreApplicationPrivate::initLocale();
#endif
    // First try getting the codecs name from nl_langinfo and see
    // if we have a builtin codec for it.
    // Only fall back to using iconv if we can't find a builtin codec
    // This is because the builtin utf8 codec is around 5 times faster
    // then the using QIconvCodec

#if defined (_XOPEN_UNIX) && !defined(Q_OS_QNX) && !defined(Q_OS_OSF) && !defined(Q_OS_LINUX_ANDROID)
    char *charset = nl_langinfo(CODESET);
    if (charset)
        localeMapper = QTextCodec::codecForName(charset);
#endif
#if !defined(QT_NO_ICONV) && !defined(QT_BOOTSTRAPPED)
    if (!localeMapper) {
        // no builtin codec for the locale found, let's try using iconv
        (void) new QIconvCodec();
        localeMapper = QTextCodec::codecForName("System");
    }
#endif

    if (!localeMapper) {
        // Very poorly defined and followed standards causes lots of
        // code to try to get all the cases... This logic is
        // duplicated in QIconvCodec, so if you change it here, change
        // it there too.

        // Try to determine locale codeset from locale name assigned to
        // LC_CTYPE category.

        // First part is getting that locale name.  First try setlocale() which
        // definitely knows it, but since we cannot fully trust it, get ready
        // to fall back to environment variables.
        const QByteArray ctype = setlocale(LC_CTYPE, 0);

        // Get the first nonempty value from $LC_ALL, $LC_CTYPE, and $LANG
        // environment variables.
        QByteArray lang = qgetenv("LC_ALL");
        if (lang.isEmpty() || lang == "C") {
            lang = qgetenv("LC_CTYPE");
        }
        if (lang.isEmpty() || lang == "C") {
            lang = qgetenv("LANG");
        }

        // Now try these in order:
        // 1. CODESET from ctype if it contains a .CODESET part (e.g. en_US.ISO8859-15)
        // 2. CODESET from lang if it contains a .CODESET part
        // 3. ctype (maybe the locale is named "ISO-8859-1" or something)
        // 4. locale (ditto)
        // 5. check for "@euro"
        // 6. guess locale from ctype unless ctype is "C"
        // 7. guess locale from lang

        // 1. CODESET from ctype if it contains a .CODESET part (e.g. en_US.ISO8859-15)
        int indexOfDot = ctype.indexOf('.');
        if (indexOfDot != -1)
            localeMapper = checkForCodec( ctype.mid(indexOfDot + 1) );

        // 2. CODESET from lang if it contains a .CODESET part
        if (!localeMapper) {
            indexOfDot = lang.indexOf('.');
            if (indexOfDot != -1)
                localeMapper = checkForCodec( lang.mid(indexOfDot + 1) );
        }

        // 3. ctype (maybe the locale is named "ISO-8859-1" or something)
        if (!localeMapper && !ctype.isEmpty() && ctype != "C")
            localeMapper = checkForCodec(ctype);

        // 4. locale (ditto)
        if (!localeMapper && !lang.isEmpty())
            localeMapper = checkForCodec(lang);

        // 5. "@euro"
        if ((!localeMapper && ctype.contains("@euro")) || lang.contains("@euro"))
            localeMapper = checkForCodec("ISO 8859-15");

        // 6. guess locale from ctype unless ctype is "C"
        // 7. guess locale from lang
        const QByteArray &try_by_name = (!ctype.isEmpty() && ctype != "C") ? lang : ctype;

        // Now do the guessing.
        if (!lang.isEmpty() && !localeMapper && !try_by_name.isEmpty()) {
            if (try_locale_list(iso8859_15locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-15");
            else if (try_locale_list(iso8859_2locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-2");
            else if (try_locale_list(iso8859_3locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-3");
            else if (try_locale_list(iso8859_4locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-4");
            else if (try_locale_list(iso8859_5locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-5");
            else if (try_locale_list(iso8859_6locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-6");
            else if (try_locale_list(iso8859_7locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-7");
            else if (try_locale_list(iso8859_8locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-8-I");
            else if (try_locale_list(iso8859_9locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-9");
            else if (try_locale_list(iso8859_13locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-13");
            else if (try_locale_list(tis_620locales, lang))
                localeMapper = QTextCodec::codecForName("ISO 8859-11");
            else if (try_locale_list(koi8_ulocales, lang))
                localeMapper = QTextCodec::codecForName("KOI8-U");
            else if (try_locale_list(cp_1251locales, lang))
                localeMapper = QTextCodec::codecForName("CP 1251");
            else if (try_locale_list(pt_154locales, lang))
                localeMapper = QTextCodec::codecForName("PT 154");
            else if (try_locale_list(probably_koi8_rlocales, lang))
                localeMapper = ru_RU_hack(lang.constData());
        }

    }

    // If everything failed, we default to 8859-1
    // We could perhaps default to 8859-15.
    if (!localeMapper)
        localeMapper = QTextCodec::codecForName("ISO 8859-1");
#endif
}

#ifndef QT_NO_THREAD
Q_GLOBAL_STATIC_WITH_ARGS(QMutex, textCodecsMutex, (QMutex::Recursive));
#endif

// textCodecsMutex need to be locked to enter this function
static void setup()
{
    if (all)
        return;

#ifdef Q_DEBUG_TEXTCODEC
    if (destroying_is_ok)
        qWarning("QTextCodec: Creating new codec during codec cleanup");
#endif
    all = new QList<QTextCodec*>;
    // create the cleanup object to cleanup all codecs on exit
    (void) createQTextCodecCleanup();

#ifndef QT_NO_CODECS
    (void)new QTsciiCodec;
    for (int i = 0; i < 9; ++i)
        (void)new QIsciiCodec(i);

    for (int i = 0; i < QSimpleTextCodec::numSimpleCodecs; ++i)
        (void)new QSimpleTextCodec(i);

#  if defined(Q_OS_UNIX) && !defined(QT_BOOTSTRAPPED)
    // no font codecs when bootstrapping
    (void)new QFontLaoCodec;
    (void)new QFontGb2312Codec;
    (void)new QFontGbkCodec;
    (void)new QFontGb18030_0Codec;
    (void)new QFontJis0208Codec;
    (void)new QFontJis0201Codec;
    (void)new QFontKsc5601Codec;
    (void)new QFontBig5hkscsCodec;
    (void)new QFontBig5Codec;
#  endif // Q_OS_UNIX && !QT_BOOTSTRAPPED


#if !defined(Q_OS_INTEGRITY)
#  if !defined(QT_BOOTSTRAPPED)
    // no asian codecs when bootstrapping, sorry
    (void)new QGb18030Codec;
    (void)new QGbkCodec;
    (void)new QGb2312Codec;
    (void)new QEucJpCodec;
    (void)new QJisCodec;
    (void)new QSjisCodec;
    (void)new QEucKrCodec;
    (void)new QCP949Codec;
    (void)new QBig5Codec;
    (void)new QBig5hkscsCodec;
#  endif // !QT_BOOTSTRAPPED
#endif // !Q_OS_INTEGRITY
#endif // QT_NO_CODECS

#if defined(Q_OS_WIN32) || defined(Q_OS_WINCE)
    (void) new QWindowsLocalCodec;
#endif // Q_OS_WIN32

    (void)new QUtf16Codec;
    (void)new QUtf16BECodec;
    (void)new QUtf16LECodec;
    (void)new QUtf32Codec;
    (void)new QUtf32BECodec;
    (void)new QUtf32LECodec;
    (void)new QLatin15Codec;
    (void)new QLatin1Codec;
    (void)new QUtf8Codec;

    if (!localeMapper)
        setupLocaleMapper();
}

/*!
    \enum QTextCodec::ConversionFlag

    \value DefaultConversion  No flag is set.
    \value ConvertInvalidToNull  If this flag is set, each invalid input
                                 character is output as a null character.
    \value IgnoreHeader  Ignore any Unicode byte-order mark and don't generate any.

    \omitvalue FreeFunction
*/

/*!
    \fn QTextCodec::ConverterState::ConverterState(ConversionFlags flags)

    Constructs a ConverterState object initialized with the given \a flags.
*/

/*!
    Destroys the ConverterState object.
*/
QTextCodec::ConverterState::~ConverterState()
{
    if (flags & FreeFunction)
        (QTextCodecUnalignedPointer::decode(state_data))(this);
    else if (d)
        free(d);
}

/*!
    \class QTextCodec
    \brief The QTextCodec class provides conversions between text encodings.
    \reentrant
    \ingroup i18n

    Qt uses Unicode to store, draw and manipulate strings. In many
    situations you may wish to deal with data that uses a different
    encoding. For example, most Japanese documents are still stored
    in Shift-JIS or ISO 2022-JP, while Russian users often have their
    documents in KOI8-R or Windows-1251.

    Qt provides a set of QTextCodec classes to help with converting
    non-Unicode formats to and from Unicode. You can also create your
    own codec classes.

    The supported encodings are:

    \list
    \li Apple Roman
    \li \l{Big5 Text Codec}{Big5}
    \li \l{Big5-HKSCS Text Codec}{Big5-HKSCS}
    \li CP949
    \li \l{EUC-JP Text Codec}{EUC-JP}
    \li \l{EUC-KR Text Codec}{EUC-KR}
    \li \l{GBK Text Codec}{GB18030-0}
    \li IBM 850
    \li IBM 866
    \li IBM 874
    \li \l{ISO 2022-JP (JIS) Text Codec}{ISO 2022-JP}
    \li ISO 8859-1 to 10
    \li ISO 8859-13 to 16
    \li Iscii-Bng, Dev, Gjr, Knd, Mlm, Ori, Pnj, Tlg, and Tml
    \li JIS X 0201
    \li JIS X 0208
    \li KOI8-R
    \li KOI8-U
    \li MuleLao-1
    \li ROMAN8
    \li \l{Shift-JIS Text Codec}{Shift-JIS}
    \li TIS-620
    \li \l{TSCII Text Codec}{TSCII}
    \li UTF-8
    \li UTF-16
    \li UTF-16BE
    \li UTF-16LE
    \li UTF-32
    \li UTF-32BE
    \li UTF-32LE
    \li Windows-1250 to 1258
    \li WINSAMI2
    \endlist

    QTextCodecs can be used as follows to convert some locally encoded
    string to Unicode. Suppose you have some string encoded in Russian
    KOI8-R encoding, and want to convert it to Unicode. The simple way
    to do it is like this:

    \snippet code/src_corelib_codecs_qtextcodec.cpp 0

    After this, \c string holds the text converted to Unicode.
    Converting a string from Unicode to the local encoding is just as
    easy:

    \snippet code/src_corelib_codecs_qtextcodec.cpp 1

    To read or write files in various encodings, use QTextStream and
    its \l{QTextStream::setCodec()}{setCodec()} function. See the
    \l{tools/codecs}{Codecs} example for an application of QTextCodec
    to file I/O.

    Some care must be taken when trying to convert the data in chunks,
    for example, when receiving it over a network. In such cases it is
    possible that a multi-byte character will be split over two
    chunks. At best this might result in the loss of a character and
    at worst cause the entire conversion to fail.

    The approach to use in these situations is to create a QTextDecoder
    object for the codec and use this QTextDecoder for the whole
    decoding process, as shown below:

    \snippet code/src_corelib_codecs_qtextcodec.cpp 2

    The QTextDecoder object maintains state between chunks and therefore
    works correctly even if a multi-byte character is split between
    chunks.

    \section1 Creating Your Own Codec Class

    Support for new text encodings can be added to Qt by creating
    QTextCodec subclasses.

    The pure virtual functions describe the encoder to the system and
    the coder is used as required in the different text file formats
    supported by QTextStream, and under X11, for the locale-specific
    character input and output.

    To add support for another encoding to Qt, make a subclass of
    QTextCodec and implement the functions listed in the table below.

    \table
    \header \li Function \li Description

    \row \li name()
         \li Returns the official name for the encoding. If the
            encoding is listed in the
            \l{IANA character-sets encoding file}, the name
            should be the preferred MIME name for the encoding.

    \row \li aliases()
         \li Returns a list of alternative names for the encoding.
            QTextCodec provides a default implementation that returns
            an empty list. For example, "ISO-8859-1" has "latin1",
            "CP819", "IBM819", and "iso-ir-100" as aliases.

    \row \li mibEnum()
         \li Return the MIB enum for the encoding if it is listed in
            the \l{IANA character-sets encoding file}.

    \row \li convertToUnicode()
         \li Converts an 8-bit character string to Unicode.

    \row \li convertFromUnicode()
         \li Converts a Unicode string to an 8-bit character string.
    \endtable

    \sa QTextStream, QTextDecoder, QTextEncoder, {Codecs Example}
*/

/*!
    Constructs a QTextCodec, and gives it the highest precedence. The
    QTextCodec should always be constructed on the heap (i.e. with \c
    new). Qt takes ownership and will delete it when the application
    terminates.
*/
QTextCodec::QTextCodec()
{
#ifndef QT_NO_THREAD
    QMutexLocker locker(textCodecsMutex());
#endif
    setup();
    all->prepend(this);
}


/*!
    \nonreentrant

    Destroys the QTextCodec. Note that you should not delete codecs
    yourself: once created they become Qt's responsibility.
*/
QTextCodec::~QTextCodec()
{
#ifdef Q_DEBUG_TEXTCODEC
    if (!destroying_is_ok)
        qWarning("QTextCodec::~QTextCodec: Called by application");
#endif
    if (all) {
#ifndef QT_NO_THREAD
        QMutexLocker locker(textCodecsMutex());
#endif
        all->removeAll(this);
        QTextCodecCache *cache = qTextCodecCache();
        if (cache)
            cache->clear();
    }
}

/*!
    \fn QTextCodec *QTextCodec::codecForName(const char *name)

    Searches all installed QTextCodec objects and returns the one
    which best matches \a name; the match is case-insensitive. Returns
    0 if no codec matching the name \a name could be found.
*/

/*!
    Searches all installed QTextCodec objects and returns the one
    which best matches \a name; the match is case-insensitive. Returns
    0 if no codec matching the name \a name could be found.
*/
QTextCodec *QTextCodec::codecForName(const QByteArray &name)
{
    if (name.isEmpty())
        return 0;

#ifndef QT_NO_THREAD
    QMutexLocker locker(textCodecsMutex());
#endif
    setup();

    if (!validCodecs())
        return 0;

    QTextCodecCache *cache = qTextCodecCache();
    QTextCodec *codec;
    if (cache) {
        codec = cache->value(name);
        if (codec)
            return codec;
    }

    for (int i = 0; i < all->size(); ++i) {
        QTextCodec *cursor = all->at(i);
        if (nameMatch(cursor->name(), name)) {
            if (cache)
                cache->insert(name, cursor);
            return cursor;
        }
        QList<QByteArray> aliases = cursor->aliases();
        for (int y = 0; y < aliases.size(); ++y)
            if (nameMatch(aliases.at(y), name)) {
                if (cache)
                    cache->insert(name, cursor);
                return cursor;
            }
    }

    return 0;
}


/*!
    Returns the QTextCodec which matches the
    \l{QTextCodec::mibEnum()}{MIBenum} \a mib.
*/
QTextCodec* QTextCodec::codecForMib(int mib)
{
#ifndef QT_NO_THREAD
    QMutexLocker locker(textCodecsMutex());
#endif
    setup();

    if (!validCodecs())
        return 0;

    QByteArray key = "MIB: " + QByteArray::number(mib);
    QTextCodecCache *cache = qTextCodecCache();
    QTextCodec *codec;
    if (cache) {
        codec = cache->value(key);
        if (codec)
            return codec;
    }

    QList<QTextCodec*>::ConstIterator i;
    for (int i = 0; i < all->size(); ++i) {
        QTextCodec *cursor = all->at(i);
        if (cursor->mibEnum() == mib) {
            if (cache)
                cache->insert(key, cursor);
            return cursor;
        }
    }

    return 0;
}

/*!
    Returns the list of all available codecs, by name. Call
    QTextCodec::codecForName() to obtain the QTextCodec for the name.

    The list may contain many mentions of the same codec
    if the codec has aliases.

    \sa availableMibs(), name(), aliases()
*/
QList<QByteArray> QTextCodec::availableCodecs()
{
#ifndef QT_NO_THREAD
    QMutexLocker locker(textCodecsMutex());
#endif
    setup();

    QList<QByteArray> codecs;

    if (!validCodecs())
        return codecs;

    for (int i = 0; i < all->size(); ++i) {
        codecs += all->at(i)->name();
        codecs += all->at(i)->aliases();
    }

#ifndef QT_NO_THREAD
    locker.unlock();
#endif

    return codecs;
}

/*!
    Returns the list of MIBs for all available codecs. Call
    QTextCodec::codecForMib() to obtain the QTextCodec for the MIB.

    \sa availableCodecs(), mibEnum()
*/
QList<int> QTextCodec::availableMibs()
{
#ifndef QT_NO_THREAD
    QMutexLocker locker(textCodecsMutex());
#endif
    setup();

    QList<int> codecs;

    if (!validCodecs())
        return codecs;

    for (int i = 0; i < all->size(); ++i)
        codecs += all->at(i)->mibEnum();

#ifndef QT_NO_THREAD
    locker.unlock();
#endif

    return codecs;
}

/*!
    Set the codec to \a c; this will be returned by
    codecForLocale(). If \a c is a null pointer, the codec is reset to
    the default.

    This might be needed for some applications that want to use their
    own mechanism for setting the locale.

    \sa codecForLocale()
*/
void QTextCodec::setCodecForLocale(QTextCodec *c)
{
#ifndef QT_NO_THREAD
    QMutexLocker locker(textCodecsMutex());
#endif
    localeMapper = c;
    if (!localeMapper)
        setupLocaleMapper();
}

/*!
    Returns a pointer to the codec most suitable for this locale.

    On Windows, the codec will be based on a system locale. On Unix
    systems, the codec will might fall back to using the \e iconv
    library if no builtin codec for the locale can be found.

    Note that in these cases the codec's name will be "System".
*/

QTextCodec* QTextCodec::codecForLocale()
{
    if (!validCodecs())
        return 0;

    if (localeMapper)
        return localeMapper;

#ifndef QT_NO_THREAD
    QMutexLocker locker(textCodecsMutex());
#endif
    setup();

    return localeMapper;
}


/*!
    \fn QByteArray QTextCodec::name() const

    QTextCodec subclasses must reimplement this function. It returns
    the name of the encoding supported by the subclass.

    If the codec is registered as a character set in the
    \l{IANA character-sets encoding file} this method should
    return the preferred mime name for the codec if defined,
    otherwise its name.
*/

/*!
    \fn int QTextCodec::mibEnum() const

    Subclasses of QTextCodec must reimplement this function. It
    returns the MIBenum (see \l{IANA character-sets encoding file}
    for more information). It is important that each QTextCodec
    subclass returns the correct unique value for this function.
*/

/*!
  Subclasses can return a number of aliases for the codec in question.

  Standard aliases for codecs can be found in the
  \l{IANA character-sets encoding file}.
*/
QList<QByteArray> QTextCodec::aliases() const
{
    return QList<QByteArray>();
}

/*!
    \fn QString QTextCodec::convertToUnicode(const char *chars, int len,
                                             ConverterState *state) const

    QTextCodec subclasses must reimplement this function.

    Converts the first \a len characters of \a chars from the
    encoding of the subclass to Unicode, and returns the result in a
    QString.

    \a state can be 0, in which case the conversion is stateless and
    default conversion rules should be used. If state is not 0, the
    codec should save the state after the conversion in \a state, and
    adjust the remainingChars and invalidChars members of the struct.
*/

/*!
    \fn QByteArray QTextCodec::convertFromUnicode(const QChar *input, int number,
                                                  ConverterState *state) const

    QTextCodec subclasses must reimplement this function.

    Converts the first \a number of characters from the \a input array
    from Unicode to the encoding of the subclass, and returns the result
    in a QByteArray.

    \a state can be 0 in which case the conversion is stateless and
    default conversion rules should be used. If state is not 0, the
    codec should save the state after the conversion in \a state, and
    adjust the remainingChars and invalidChars members of the struct.
*/

/*!
    Creates a QTextDecoder with a specified \a flags to decode chunks
    of \c{char *} data to create chunks of Unicode data.

    The caller is responsible for deleting the returned object.

    \since 4.7
*/
QTextDecoder* QTextCodec::makeDecoder(QTextCodec::ConversionFlags flags) const
{
    return new QTextDecoder(this, flags);
}

/*!
    Creates a QTextEncoder with a specified \a flags to encode chunks
    of Unicode data as \c{char *} data.

    The caller is responsible for deleting the returned object.

    \since 4.7
*/
QTextEncoder* QTextCodec::makeEncoder(QTextCodec::ConversionFlags flags) const
{
    return new QTextEncoder(this, flags);
}

/*!
    \fn QByteArray QTextCodec::fromUnicode(const QChar *input, int number,
                                           ConverterState *state) const

    Converts the first \a number of characters from the \a input array
    from Unicode to the encoding of this codec, and returns the result
    in a QByteArray.

    The \a state of the convertor used is updated.
*/

/*!
    Converts \a str from Unicode to the encoding of this codec, and
    returns the result in a QByteArray.
*/
QByteArray QTextCodec::fromUnicode(const QString& str) const
{
    return convertFromUnicode(str.constData(), str.length(), 0);
}

/*!
    \fn QString QTextCodec::toUnicode(const char *input, int size,
                                      ConverterState *state) const

    Converts the first \a size characters from the \a input from the
    encoding of this codec to Unicode, and returns the result in a
    QString.

    The \a state of the convertor used is updated.
*/

/*!
    Converts \a a from the encoding of this codec to Unicode, and
    returns the result in a QString.
*/
QString QTextCodec::toUnicode(const QByteArray& a) const
{
    return convertToUnicode(a.constData(), a.length(), 0);
}

/*!
    Returns true if the Unicode character \a ch can be fully encoded
    with this codec; otherwise returns false.
*/
bool QTextCodec::canEncode(QChar ch) const
{
    ConverterState state;
    state.flags = ConvertInvalidToNull;
    convertFromUnicode(&ch, 1, &state);
    return (state.invalidChars == 0);
}

/*!
    \overload

    \a s contains the string being tested for encode-ability.
*/
bool QTextCodec::canEncode(const QString& s) const
{
    ConverterState state;
    state.flags = ConvertInvalidToNull;
    convertFromUnicode(s.constData(), s.length(), &state);
    return (state.invalidChars == 0);
}

/*!
    \overload

    \a chars contains the source characters.
*/
QString QTextCodec::toUnicode(const char *chars) const
{
    int len = qstrlen(chars);
    return convertToUnicode(chars, len, 0);
}


/*!
    \class QTextEncoder
    \brief The QTextEncoder class provides a state-based encoder.
    \reentrant
    \ingroup i18n

    A text encoder converts text from Unicode into an encoded text format
    using a specific codec.

    The encoder converts Unicode into another format, remembering any
    state that is required between calls.

    \sa QTextCodec::makeEncoder(), QTextDecoder
*/

/*!
    \fn QTextEncoder::QTextEncoder(const QTextCodec *codec)

    Constructs a text encoder for the given \a codec.
*/

/*!
    Constructs a text encoder for the given \a codec and conversion \a flags.

    \since 4.7
*/
QTextEncoder::QTextEncoder(const QTextCodec *codec, QTextCodec::ConversionFlags flags)
    : c(codec), state()
{
    state.flags = flags;
}

/*!
    Destroys the encoder.
*/
QTextEncoder::~QTextEncoder()
{
}

/*! \internal
    \since 4.5
    Determines whether the eecoder encountered a failure while decoding the input. If
    an error was encountered, the produced result is undefined, and gets converted as according
    to the conversion flags.
 */
bool QTextEncoder::hasFailure() const
{
    return state.invalidChars != 0;
}

/*!
    Converts the Unicode string \a str into an encoded QByteArray.
*/
QByteArray QTextEncoder::fromUnicode(const QString& str)
{
    QByteArray result = c->fromUnicode(str.constData(), str.length(), &state);
    return result;
}

/*!
    \overload

    Converts \a len characters (not bytes) from \a uc, and returns the
    result in a QByteArray.
*/
QByteArray QTextEncoder::fromUnicode(const QChar *uc, int len)
{
    QByteArray result = c->fromUnicode(uc, len, &state);
    return result;
}

/*!
    \class QTextDecoder
    \brief The QTextDecoder class provides a state-based decoder.
    \reentrant
    \ingroup i18n

    A text decoder converts text from an encoded text format into Unicode
    using a specific codec.

    The decoder converts text in this format into Unicode, remembering any
    state that is required between calls.

    \sa QTextCodec::makeDecoder(), QTextEncoder
*/

/*!
    \fn QTextDecoder::QTextDecoder(const QTextCodec *codec)

    Constructs a text decoder for the given \a codec.
*/

/*!
    Constructs a text decoder for the given \a codec and conversion \a flags.

    \since 4.7
*/

QTextDecoder::QTextDecoder(const QTextCodec *codec, QTextCodec::ConversionFlags flags)
    : c(codec), state()
{
    state.flags = flags;
}

/*!
    Destroys the decoder.
*/
QTextDecoder::~QTextDecoder()
{
}

/*!
    \fn QString QTextDecoder::toUnicode(const char *chars, int len)

    Converts the first \a len bytes in \a chars to Unicode, returning
    the result.

    If not all characters are used (e.g. if only part of a multi-byte
    encoding is at the end of the characters), the decoder remembers
    enough state to continue with the next call to this function.
*/
QString QTextDecoder::toUnicode(const char *chars, int len)
{
    return c->toUnicode(chars, len, &state);
}


/*! \overload

    The converted string is returned in \a target.
 */
void QTextDecoder::toUnicode(QString *target, const char *chars, int len)
{
    Q_ASSERT(target);
    switch (c->mibEnum()) {
    case 106: // utf8
        static_cast<const QUtf8Codec*>(c)->convertToUnicode(target, chars, len, &state);
        break;
    case 4: { // latin1
        target->resize(len);
        ushort *data = (ushort*)target->data();
        for (int i = len; i >=0; --i)
            data[i] = (uchar) chars[i];
    } break;
    default:
        *target = c->toUnicode(chars, len, &state);
    }
}


/*!
    \overload

    Converts the bytes in the byte array specified by \a ba to Unicode
    and returns the result.
*/
QString QTextDecoder::toUnicode(const QByteArray &ba)
{
    return c->toUnicode(ba.constData(), ba.length(), &state);
}

/*!
    \since 4.4

    Tries to detect the encoding of the provided snippet of HTML in
    the given byte array, \a ba, by checking the BOM (Byte Order Mark)
    and the content-type meta header and returns a QTextCodec instance
    that is capable of decoding the html to unicode.  If the codec
    cannot be detected from the content provided, \a defaultCodec is
    returned.

    \sa codecForUtfText()
*/
QTextCodec *QTextCodec::codecForHtml(const QByteArray &ba, QTextCodec *defaultCodec)
{
    // determine charset
    int pos;
    QTextCodec *c = 0;

    c = QTextCodec::codecForUtfText(ba, c);
    if (!c) {
        QByteArray header = ba.left(512).toLower();
        if ((pos = header.indexOf("http-equiv=")) != -1) {
            if ((pos = header.lastIndexOf("meta ", pos)) != -1) {
                pos = header.indexOf("charset=", pos) + int(strlen("charset="));
                if (pos != -1) {
                    int pos2 = header.indexOf('\"', pos+1);
                    QByteArray cs = header.mid(pos, pos2-pos);
                    //            qDebug("found charset: %s", cs.data());
                    c = QTextCodec::codecForName(cs);
                }
            }
        }
    }
    if (!c)
        c = defaultCodec;

    return c;
}

/*!
    \overload

    Tries to detect the encoding of the provided snippet of HTML in
    the given byte array, \a ba, by checking the BOM (Byte Order Mark)
    and the content-type meta header and returns a QTextCodec instance
    that is capable of decoding the html to unicode. If the codec cannot
    be detected, this overload returns a Latin-1 QTextCodec.
*/
QTextCodec *QTextCodec::codecForHtml(const QByteArray &ba)
{
    return codecForHtml(ba, QTextCodec::codecForMib(/*Latin 1*/ 4));
}

/*!
    \since 4.6

    Tries to detect the encoding of the provided snippet \a ba by
    using the BOM (Byte Order Mark) and returns a QTextCodec instance
    that is capable of decoding the text to unicode. If the codec
    cannot be detected from the content provided, \a defaultCodec is
    returned.

    \sa codecForHtml()
*/
QTextCodec *QTextCodec::codecForUtfText(const QByteArray &ba, QTextCodec *defaultCodec)
{
    const int arraySize = ba.size();

    if (arraySize > 3) {
        if ((uchar)ba[0] == 0x00
            && (uchar)ba[1] == 0x00
            && (uchar)ba[2] == 0xFE
            && (uchar)ba[3] == 0xFF)
            return QTextCodec::codecForMib(1018); // utf-32 be
        else if ((uchar)ba[0] == 0xFF
                 && (uchar)ba[1] == 0xFE
                 && (uchar)ba[2] == 0x00
                 && (uchar)ba[3] == 0x00)
            return QTextCodec::codecForMib(1019); // utf-32 le
    }

    if (arraySize < 2)
        return defaultCodec;
    if ((uchar)ba[0] == 0xfe && (uchar)ba[1] == 0xff)
        return QTextCodec::codecForMib(1013); // utf16 be
    else if ((uchar)ba[0] == 0xff && (uchar)ba[1] == 0xfe)
        return QTextCodec::codecForMib(1014); // utf16 le

    if (arraySize < 3)
        return defaultCodec;
    if ((uchar)ba[0] == 0xef
        && (uchar)ba[1] == 0xbb
        && (uchar)ba[2] == 0xbf)
        return QTextCodec::codecForMib(106); // utf-8

    return defaultCodec;
}

/*!
    \overload

    Tries to detect the encoding of the provided snippet \a ba by
    using the BOM (Byte Order Mark) and returns a QTextCodec instance
    that is capable of decoding the text to unicode. If the codec
    cannot be detected, this overload returns a Latin-1 QTextCodec.

    \sa codecForHtml()
*/
QTextCodec *QTextCodec::codecForUtfText(const QByteArray &ba)
{
    return codecForUtfText(ba, QTextCodec::codecForMib(/*Latin 1*/ 4));
}


/*! \internal
    \since 4.3
    Determines whether the decoder encountered a failure while decoding the input. If
    an error was encountered, the produced result is undefined, and gets converted as according
    to the conversion flags.
 */
bool QTextDecoder::hasFailure() const
{
    return state.invalidChars != 0;
}

QT_END_NAMESPACE

#endif // QT_NO_TEXTCODEC