summaryrefslogtreecommitdiffstats
path: root/src/corelib/codecs/qiconvcodec.cpp
blob: 7f89a8fdacf0c6a862a81b748f75529ea2f1f10c (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
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qiconvcodec_p.h"
#include "qtextcodec_p.h"
#include <qlibrary.h>
#include <qdebug.h>
#include <qthreadstorage.h>

#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <dlfcn.h>

// unistd.h is needed for the _XOPEN_UNIX macro
#include <unistd.h>
#if defined(_XOPEN_UNIX) && !defined(Q_OS_QNX) && !defined(Q_OS_OSF)
#  include <langinfo.h>
#endif

#if defined(Q_OS_HPUX)
#  define NO_BOM
#  define UTF16 "ucs2"
#elif defined(Q_OS_AIX)
#  define NO_BOM
#  define UTF16 "UCS-2"
#elif defined(Q_OS_MAC)
#  define NO_BOM
#  if Q_BYTE_ORDER == Q_BIG_ENDIAN
#    define UTF16 "UTF-16BE"
#  else
#    define UTF16 "UTF-16LE"
#  endif
#else
#  define UTF16 "UTF-16"
#endif

#if defined(Q_OS_MAC)
#ifndef GNU_LIBICONV
#define GNU_LIBICONV
#endif
typedef iconv_t (*Ptr_iconv_open) (const char*, const char*);
typedef size_t (*Ptr_iconv) (iconv_t, const char **, size_t *, char **, size_t *);
typedef int (*Ptr_iconv_close) (iconv_t);

static Ptr_iconv_open ptr_iconv_open = 0;
static Ptr_iconv ptr_iconv = 0;
static Ptr_iconv_close ptr_iconv_close = 0;
#endif

QT_BEGIN_NAMESPACE

extern bool qt_locale_initialized;

QIconvCodec::QIconvCodec()
    : utf16Codec(0)
{
    utf16Codec = QTextCodec::codecForMib(1015);
    Q_ASSERT_X(utf16Codec != 0,
               "QIconvCodec::convertToUnicode",
               "internal error, UTF-16 codec not found");
    if (!utf16Codec) {
        fprintf(stderr, "QIconvCodec::convertToUnicode: internal error, UTF-16 codec not found\n");
        utf16Codec = reinterpret_cast<QTextCodec *>(~0);
    }
#if defined(Q_OS_MAC)
    if (ptr_iconv_open == 0) {
        QLibrary libiconv(QLatin1String("/usr/lib/libiconv"));
        libiconv.setLoadHints(QLibrary::ExportExternalSymbolsHint);

        ptr_iconv_open = reinterpret_cast<Ptr_iconv_open>(libiconv.resolve("libiconv_open"));
        if (!ptr_iconv_open)
            ptr_iconv_open = reinterpret_cast<Ptr_iconv_open>(libiconv.resolve("iconv_open"));
        ptr_iconv = reinterpret_cast<Ptr_iconv>(libiconv.resolve("libiconv"));
        if (!ptr_iconv)
            ptr_iconv = reinterpret_cast<Ptr_iconv>(libiconv.resolve("iconv"));
        ptr_iconv_close = reinterpret_cast<Ptr_iconv_close>(libiconv.resolve("libiconv_close"));
        if (!ptr_iconv_close)
            ptr_iconv_close = reinterpret_cast<Ptr_iconv_close>(libiconv.resolve("iconv_close"));

        Q_ASSERT_X(ptr_iconv_open && ptr_iconv && ptr_iconv_close,
        "QIconvCodec::QIconvCodec()",
        "internal error, could not resolve the iconv functions");

#       undef iconv_open
#       define iconv_open ptr_iconv_open
#       undef iconv
#       define iconv ptr_iconv
#       undef iconv_close
#       define iconv_close ptr_iconv_close
    }
#endif
}

QIconvCodec::~QIconvCodec()
{
}

QIconvCodec::IconvState::IconvState(iconv_t x)
    : buffer(array), bufferLen(sizeof array), cd(x)
{
}

QIconvCodec::IconvState::~IconvState()
{
    if (cd != reinterpret_cast<iconv_t>(-1))
        iconv_close(cd);
    if (buffer != array)
        delete[] buffer;
}

void QIconvCodec::IconvState::saveChars(const char *c, int count)
{
    if (count > bufferLen) {
        if (buffer != array)
            delete[] buffer;
        buffer = new char[bufferLen = count];
    }

    memcpy(buffer, c, count);
}

static void qIconvCodecStateFree(QTextCodec::ConverterState *state)
{
    delete reinterpret_cast<QIconvCodec::IconvState *>(state->d);
}

Q_GLOBAL_STATIC(QThreadStorage<QIconvCodec::IconvState *>, toUnicodeState)

QString QIconvCodec::convertToUnicode(const char* chars, int len, ConverterState *convState) const
{
    if (utf16Codec == reinterpret_cast<QTextCodec *>(~0))
        return QString::fromAscii(chars, len);

    int invalidCount = 0;
    int remainingCount = 0;
    char *remainingBuffer = 0;
    IconvState **pstate;

    if (convState) {
        // stateful conversion
        pstate = reinterpret_cast<IconvState **>(&convState->d);
        if (convState->d) {
            // restore state
            remainingCount = convState->remainingChars;
            remainingBuffer = (*pstate)->buffer;
        } else {
            // first time
            convState->flags |= FreeFunction;
            QTextCodecUnalignedPointer::encode(convState->state_data, qIconvCodecStateFree);
        }
    } else {
        QThreadStorage<QIconvCodec::IconvState *> *ts = toUnicodeState();
        if (!qt_locale_initialized || !ts) {
            // we're running after the Q_GLOBAL_STATIC has been deleted
            // or before the QCoreApplication initialization
            // bad programmer, no cookie for you
            return QString::fromLatin1(chars, len);
        }

        // stateless conversion -- use thread-local data
        pstate = &toUnicodeState()->localData();
    }

    if (!*pstate) {
        // first time, create the state
        iconv_t cd = QIconvCodec::createIconv_t(UTF16, 0);
        if (cd == reinterpret_cast<iconv_t>(-1)) {
            static int reported = 0;
            if (!reported++) {
                fprintf(stderr,
                        "QIconvCodec::convertToUnicode: using ASCII for conversion, iconv_open failed\n");
            }
            return QString::fromAscii(chars, len);
        }

        *pstate = new IconvState(cd);
    }

    IconvState *state = *pstate;
    size_t inBytesLeft = len;
    // best case assumption, each byte is converted into one UTF-16 character, plus 2 bytes for the BOM
#ifdef GNU_LIBICONV
    // GNU doesn't disagree with POSIX :/
    const char *inBytes = chars;
#else
    char *inBytes = const_cast<char *>(chars);
#endif

    QByteArray in;
    if (remainingCount) {
        // we have to prepend the remaining bytes from the previous conversion
        inBytesLeft += remainingCount;
        in.resize(inBytesLeft);
        inBytes = in.data();

        memcpy(in.data(), remainingBuffer, remainingCount);
        memcpy(in.data() + remainingCount, chars, len);

        remainingCount = 0;
    }

    size_t outBytesLeft = len * 2 + 2;
    QByteArray ba(outBytesLeft, Qt::Uninitialized);
    char *outBytes = ba.data();
    do {
        size_t ret = iconv(state->cd, &inBytes, &inBytesLeft, &outBytes, &outBytesLeft);
        if (ret == (size_t) -1) {
            if (errno == E2BIG) {
                int offset = ba.size() - outBytesLeft;
                ba.resize(ba.size() * 2);
                outBytes = ba.data() + offset;
                outBytesLeft = ba.size() - offset;

                continue;
            }

            if (errno == EILSEQ) {
                // conversion stopped because of an invalid character in the sequence
                ++invalidCount;
            } else if (errno == EINVAL && convState) {
                // conversion stopped because the remaining inBytesLeft make up
                // an incomplete multi-byte sequence; save them for later
                state->saveChars(inBytes, inBytesLeft);
                remainingCount = inBytesLeft;
                break;
            }

            if (errno == EILSEQ || errno == EINVAL) {
                // skip the next character
                ++inBytes;
                --inBytesLeft;
                continue;
            }

            // some other error
            // note, cannot use qWarning() since we are implementing the codecForLocale :)
            perror("QIconvCodec::convertToUnicode: using ASCII for conversion, iconv failed");

            if (!convState) {
                // reset state
                iconv(state->cd, 0, &inBytesLeft, 0, &outBytesLeft);
            }

            return QString::fromAscii(chars, len);
        }
    } while (inBytesLeft != 0);

    QString s = utf16Codec->toUnicode(ba.constData(), ba.size() - outBytesLeft);

    if (convState) {
        convState->invalidChars = invalidCount;
        convState->remainingChars = remainingCount;
    } else {
        // reset state
        iconv(state->cd, 0, &inBytesLeft, 0, &outBytesLeft);
    }

    return s;
}

Q_GLOBAL_STATIC(QThreadStorage<QIconvCodec::IconvState *>, fromUnicodeState)

QByteArray QIconvCodec::convertFromUnicode(const QChar *uc, int len, ConverterState *convState) const
{
    char *inBytes;
    char *outBytes;
    size_t inBytesLeft;

#if defined(GNU_LIBICONV)
    const char **inBytesPtr = const_cast<const char **>(&inBytes);
#else
    char **inBytesPtr = &inBytes;
#endif

    QThreadStorage<QIconvCodec::IconvState *> *ts = fromUnicodeState();
    if (!qt_locale_initialized || !ts) {
        // we're running after the Q_GLOBAL_STATIC has been deleted
        // or before the QCoreApplication initialization
        // bad programmer, no cookie for you
        if (!len)
            // this is a special case - zero-sized string should be
            // translated to empty but not-null QByteArray.
            return QByteArray("");
        return QString::fromRawData(uc, len).toLatin1();
    }
    IconvState *&state = ts->localData();
    if (!state) {
        state = new IconvState(QIconvCodec::createIconv_t(0, UTF16));
        if (state->cd != reinterpret_cast<iconv_t>(-1)) {
            size_t outBytesLeft = len + 3; // +3 for the BOM
            QByteArray ba(outBytesLeft, Qt::Uninitialized);
            outBytes = ba.data();

#if !defined(NO_BOM)
            // give iconv() a BOM
            QChar bom[] = { QChar(QChar::ByteOrderMark) };
            inBytes = reinterpret_cast<char *>(bom);
            inBytesLeft = sizeof(bom);
            if (iconv(state->cd, inBytesPtr, &inBytesLeft, &outBytes, &outBytesLeft) == (size_t) -1) {
                perror("QIconvCodec::convertFromUnicode: using ASCII for conversion, iconv failed for BOM");

                iconv_close(state->cd);
                state->cd = reinterpret_cast<iconv_t>(-1);

                return QString(uc, len).toAscii();
            }
#endif // NO_BOM
        }
    }
    if (state->cd == reinterpret_cast<iconv_t>(-1)) {
        static int reported = 0;
        if (!reported++) {
            fprintf(stderr,
                    "QIconvCodec::convertFromUnicode: using ASCII for conversion, iconv_open failed\n");
        }
        return QString(uc, len).toAscii();
    }
 
    size_t outBytesLeft = len;
    QByteArray ba(outBytesLeft, Qt::Uninitialized);
    outBytes = ba.data();

    // now feed iconv() the real data
    inBytes = const_cast<char *>(reinterpret_cast<const char *>(uc));
    inBytesLeft = len * sizeof(QChar);

    QByteArray in;
    if (convState && convState->remainingChars) {
        // we have one surrogate char to be prepended
        in.resize(sizeof(QChar) + len);
        inBytes = in.data();

        QChar remaining = convState->state_data[0];
        memcpy(in.data(), &remaining, sizeof(QChar));
        memcpy(in.data() + sizeof(QChar), uc, inBytesLeft);

        inBytesLeft += sizeof(QChar);
        convState->remainingChars = 0;
    }

    int invalidCount = 0;
    do {
        if (iconv(state->cd, inBytesPtr, &inBytesLeft, &outBytes, &outBytesLeft) == (size_t) -1) {
            if (errno == EINVAL && convState) {
                // buffer ends in a surrogate
                Q_ASSERT(inBytesLeft == 2);
                convState->remainingChars = 1;
                convState->state_data[0] = uc[len - 1].unicode();
                break;
            }

            switch (errno) {
            case EILSEQ:
                ++invalidCount;
                // fall through
            case EINVAL:
                {
                    inBytes += sizeof(QChar);
                    inBytesLeft -= sizeof(QChar);
                    break;
                }
            case E2BIG:
                {
                    int offset = ba.size() - outBytesLeft;
                    ba.resize(ba.size() * 2);
                    outBytes = ba.data() + offset;
                    outBytesLeft = ba.size() - offset;
                    break;
                }
            default:
                {
                    // note, cannot use qWarning() since we are implementing the codecForLocale :)
                    perror("QIconvCodec::convertFromUnicode: using ASCII for conversion, iconv failed");

                    // reset to initial state
                    iconv(state->cd, 0, &inBytesLeft, 0, &outBytesLeft);

                    return QString(uc, len).toAscii();
                }
            }
        }
    } while (inBytesLeft != 0);

    // reset to initial state
    iconv(state->cd, 0, &inBytesLeft, 0, &outBytesLeft);

    ba.resize(ba.size() - outBytesLeft);

    if (convState)
        convState->invalidChars = invalidCount;

    return ba;
}

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

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

iconv_t QIconvCodec::createIconv_t(const char *to, const char *from)
{
    Q_ASSERT((to == 0 && from != 0) || (to != 0 && from == 0));

    iconv_t cd = (iconv_t) -1;
#if defined(__GLIBC__) || defined(GNU_LIBICONV)
    // both GLIBC and libgnuiconv will use the locale's encoding if from or to is an empty string
    static const char empty_codeset[] = "";
    const char *codeset = empty_codeset;
    cd = iconv_open(to ? to : codeset, from ? from : codeset);
#else
    char *codeset = 0;
#endif

#if defined(_XOPEN_UNIX) && !defined(Q_OS_QNX) && !defined(Q_OS_OSF)
    if (cd == (iconv_t) -1) {
        codeset = nl_langinfo(CODESET);
        if (codeset)
            cd = iconv_open(to ? to : codeset, from ? from : codeset);
    }
#endif

    if (cd == (iconv_t) -1) {
        // Very poorly defined and followed standards causes lots of
        // code to try to get all the cases... This logic is
        // duplicated in QTextCodec, 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.
        char * ctype = qstrdup(setlocale(LC_CTYPE, 0));

        // Get the first nonempty value from $LC_ALL, $LC_CTYPE, and $LANG
        // environment variables.
        char * lang = qstrdup(qgetenv("LC_ALL").constData());
        if (!lang || lang[0] == 0 || strcmp(lang, "C") == 0) {
            if (lang) delete [] lang;
            lang = qstrdup(qgetenv("LC_CTYPE").constData());
        }
        if (!lang || lang[0] == 0 || strcmp(lang, "C") == 0) {
            if (lang) delete [] lang;
            lang = qstrdup(qgetenv("LANG").constData());
        }

        // 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"

        // 1. CODESET from ctype if it contains a .CODESET part (e.g. en_US.ISO8859-15)
        codeset = ctype ? strchr(ctype, '.') : 0;
        if (codeset && *codeset == '.') {
            ++codeset;
            cd = iconv_open(to ? to : codeset, from ? from : codeset);
        }

        // 2. CODESET from lang if it contains a .CODESET part
        codeset = lang ? strchr(lang, '.') : 0;
        if (cd == (iconv_t) -1 && codeset && *codeset == '.') {
            ++codeset;
            cd = iconv_open(to ? to : codeset, from ? from : codeset);
        }

        // 3. ctype (maybe the locale is named "ISO-8859-1" or something)
        if (cd == (iconv_t) -1 && ctype && *ctype != 0 && strcmp (ctype, "C") != 0)
            cd = iconv_open(to ? to : ctype, from ? from : ctype);


        // 4. locale (ditto)
        if (cd == (iconv_t) -1 && lang && *lang != 0)
            cd = iconv_open(to ? to : lang, from ? from : lang);

        // 5. "@euro"
        if ((cd == (iconv_t) -1 && ctype && strstr(ctype, "@euro")) || (lang && strstr(lang, "@euro")))
            cd = iconv_open(to ? to : "ISO8859-15", from ? from : "ISO8859-15");

        delete [] ctype;
        delete [] lang;
    }

    return cd;
}

QT_END_NAMESPACE