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
|
/****************************************************************************
**
** 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://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qtemporaryfile.h"
#ifndef QT_NO_TEMPORARYFILE
#include "qplatformdefs.h"
#include "qabstractfileengine.h"
#include "private/qfile_p.h"
#include "private/qabstractfileengine_p.h"
#include "private/qfsfileengine_p.h"
#include <stdlib.h>
#if !defined(Q_OS_WINCE)
# include <errno.h>
# include <sys/stat.h>
# include <sys/types.h>
#endif
#include <stdlib.h>
#include <time.h>
#include <ctype.h>
#if defined(Q_OS_UNIX)
# include "private/qcore_unix_p.h" // overrides QT_OPEN
#endif
#if defined(Q_OS_WIN) && !defined(Q_OS_WINCE)
# include <process.h>
# if defined(_MSC_VER) && _MSC_VER >= 1400
# include <share.h>
# endif
#endif
#if defined(Q_OS_WINCE)
# include <types.h>
#endif
#if defined(Q_OS_VXWORKS)
# include <taskLib.h>
#endif
QT_BEGIN_NAMESPACE
/*
* Copyright (c) 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
static int _gettemp(char *path, int *doopen, int domkdir, int slen)
{
char *start, *trv, *suffp;
QT_STATBUF sbuf;
int rval;
#if defined(Q_OS_WIN)
int pid;
#else
pid_t pid;
#endif
if (doopen && domkdir) {
errno = EINVAL;
return 0;
}
for (trv = path; *trv; ++trv)
;
trv -= slen;
suffp = trv;
--trv;
if (trv < path) {
errno = EINVAL;
return 0;
}
#if defined(Q_OS_WIN) && defined(_MSC_VER) && _MSC_VER >= 1400
pid = _getpid();
#elif defined(Q_OS_VXWORKS)
pid = (pid_t) taskIdCurrent;
#else
pid = getpid();
#endif
while (trv >= path && *trv == 'X' && pid != 0) {
*trv-- = (pid % 10) + '0';
pid /= 10;
}
#ifndef S_ISDIR
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
while (trv >= path && *trv == 'X') {
char c;
// CHANGE arc4random() -> random()
pid = (qrand() & 0xffff) % (26+26);
if (pid < 26)
c = pid + 'A';
else
c = (pid - 26) + 'a';
*trv-- = c;
}
start = trv + 1;
/*
* check the target directory; if you have six X's and it
* doesn't exist this runs for a *very* long time.
*/
if (doopen || domkdir) {
for (;; --trv) {
if (trv <= path)
break;
if (*trv == '/') {
*trv = '\0';
#if defined (Q_OS_WIN) && !defined(Q_OS_WINCE)
if (trv - path == 2 && path[1] == ':') {
// Special case for Windows drives
// (e.g., "C:" => "C:\").
// ### Better to use a Windows
// call for this.
char drive[] = "c:\\";
drive[0] = path[0];
rval = QT_STAT(drive, &sbuf);
} else
#endif
rval = QT_STAT(path, &sbuf);
*trv = '/';
if (rval != 0)
return 0;
if (!S_ISDIR(sbuf.st_mode)) {
errno = ENOTDIR;
return 0;
}
break;
}
}
}
for (;;) {
if (doopen) {
#if defined(Q_OS_WIN) && !defined(Q_OS_WINCE) && defined(_MSC_VER) && _MSC_VER >= 1400
if (_sopen_s(doopen, path, QT_OPEN_CREAT|O_EXCL|QT_OPEN_RDWR|QT_OPEN_BINARY
# ifdef QT_LARGEFILE_SUPPORT
|QT_OPEN_LARGEFILE
# endif
, _SH_DENYNO, _S_IREAD | _S_IWRITE)== 0)
#else // WIN && !CE
# if defined(Q_OS_WINCE)
QString targetPath;
if (QDir::isAbsolutePath(QString::fromLatin1(path)))
targetPath = QLatin1String(path);
else
targetPath = QDir::currentPath().append(QLatin1Char('/')) + QLatin1String(path);
if ((*doopen =
QT_OPEN(targetPath.toLocal8Bit(), O_CREAT|O_EXCL|O_RDWR
# else // CE
// this is Unix or older MSVC
if ((*doopen =
QT_OPEN(path, QT_OPEN_CREAT|O_EXCL|QT_OPEN_RDWR
# endif
# ifdef QT_LARGEFILE_SUPPORT
|QT_OPEN_LARGEFILE
# endif
# if defined(Q_OS_WINCE)
|_O_BINARY
# elif defined(Q_OS_WIN)
|O_BINARY
# endif
, 0600)) >= 0)
#endif // WIN && !CE
{
return 1;
}
if (errno != EEXIST)
return 0;
} else if (domkdir) {
#ifdef Q_OS_WIN
if (QT_MKDIR(path) == 0)
#else
if (QT_MKDIR(path, 0700) == 0)
#endif
return 1;
if (errno != EEXIST)
return 0;
}
#ifndef Q_OS_WIN
else if (QT_LSTAT(path, &sbuf))
return (errno == ENOENT) ? 1 : 0;
#else
if (!QFileInfo(QLatin1String(path)).exists())
return 1;
#endif
/* tricky little algorwwithm for backward compatibility */
for (trv = start;;) {
if (!*trv)
return 0;
if (*trv == 'Z') {
if (trv == suffp)
return 0;
*trv++ = 'a';
} else {
if (isdigit(*trv))
*trv = 'a';
else if (*trv == 'z') /* inc from z to A */
*trv = 'A';
else {
if (trv == suffp)
return 0;
++*trv;
}
break;
}
}
}
/*NOTREACHED*/
}
#ifndef Q_WS_WIN
static int qt_mkstemps(char *path, int slen)
{
int fd = 0;
return (_gettemp(path, &fd, 0, slen) ? fd : -1);
}
#endif
//************* QTemporaryFileEngine
class QTemporaryFileEngine : public QFSFileEngine
{
Q_DECLARE_PRIVATE(QFSFileEngine)
public:
QTemporaryFileEngine(const QString &file, bool fileIsTemplate = true)
: QFSFileEngine(file), filePathIsTemplate(fileIsTemplate)
{
}
~QTemporaryFileEngine();
bool isReallyOpen();
void setFileName(const QString &file);
bool open(QIODevice::OpenMode flags);
bool remove();
bool rename(const QString &newName);
bool close();
bool filePathIsTemplate;
};
QTemporaryFileEngine::~QTemporaryFileEngine()
{
QFSFileEngine::close();
}
bool QTemporaryFileEngine::isReallyOpen()
{
Q_D(QFSFileEngine);
if (!((0 == d->fh) && (-1 == d->fd)
#if defined Q_OS_WIN
&& (INVALID_HANDLE_VALUE == d->fileHandle)
#endif
))
return true;
return false;
}
void QTemporaryFileEngine::setFileName(const QString &file)
{
// Really close the file, so we don't leak
QFSFileEngine::close();
QFSFileEngine::setFileName(file);
}
bool QTemporaryFileEngine::open(QIODevice::OpenMode openMode)
{
Q_D(QFSFileEngine);
Q_ASSERT(!isReallyOpen());
openMode |= QIODevice::ReadWrite;
if (!filePathIsTemplate)
return QFSFileEngine::open(openMode);
QString qfilename = d->filePath;
if(!qfilename.contains(QLatin1String("XXXXXX")))
qfilename += QLatin1String(".XXXXXX");
int suffixLength = qfilename.length() - (qfilename.lastIndexOf(QLatin1String("XXXXXX"), -1, Qt::CaseSensitive) + 6);
char *filename = qstrdup(qfilename.toLocal8Bit());
#ifndef Q_WS_WIN
int fd = qt_mkstemps(filename, suffixLength);
if (fd != -1) {
// First open the fd as an external file descriptor to
// initialize the engine properly.
if (QFSFileEngine::open(openMode, fd)) {
// Allow the engine to close the handle even if it's "external".
d->closeFileHandle = true;
// Restore the file names (open() resets them).
d->filePath = QString::fromLocal8Bit(filename); //changed now!
filePathIsTemplate = false;
d->nativeInitFileName();
delete [] filename;
return true;
}
QT_CLOSE(fd);
}
delete [] filename;
setError(errno == EMFILE ? QFile::ResourceError : QFile::OpenError, qt_error_string(errno));
return false;
#else
if (!_gettemp(filename, 0, 0, suffixLength)) {
delete [] filename;
return false;
}
d->filePath = QString::fromLocal8Bit(filename);
filePathIsTemplate = false;
d->nativeInitFileName();
d->closeFileHandle = true;
delete [] filename;
return QFSFileEngine::open(openMode);
#endif
}
bool QTemporaryFileEngine::remove()
{
Q_D(QFSFileEngine);
// Since the QTemporaryFileEngine::close() does not really close the file,
// we must explicitly call QFSFileEngine::close() before we remove it.
QFSFileEngine::close();
if (QFSFileEngine::remove()) {
d->filePath.clear();
return true;
}
return false;
}
bool QTemporaryFileEngine::rename(const QString &newName)
{
QFSFileEngine::close();
return QFSFileEngine::rename(newName);
}
bool QTemporaryFileEngine::close()
{
// Don't close the file, just seek to the front.
seek(0);
setError(QFile::UnspecifiedError, QString());
return true;
}
//************* QTemporaryFilePrivate
class QTemporaryFilePrivate : public QFilePrivate
{
Q_DECLARE_PUBLIC(QTemporaryFile)
protected:
QTemporaryFilePrivate();
~QTemporaryFilePrivate();
bool autoRemove;
QString templateName;
};
QTemporaryFilePrivate::QTemporaryFilePrivate() : autoRemove(true)
{
}
QTemporaryFilePrivate::~QTemporaryFilePrivate()
{
}
//************* QTemporaryFile
/*!
\class QTemporaryFile
\reentrant
\brief The QTemporaryFile class is an I/O device that operates on temporary files.
\ingroup io
\mainclass
QTemporaryFile is used to create unique temporary files safely.
The file itself is created by calling open(). The name of the
temporary file is guaranteed to be unique (i.e., you are
guaranteed to not overwrite an existing file), and the file will
subsequently be removed upon destruction of the QTemporaryFile
object. This is an important technique that avoids data
corruption for applications that store data in temporary files.
The file name is either auto-generated, or created based on a
template, which is passed to QTemporaryFile's constructor.
Example:
\snippet doc/src/snippets/code/src_corelib_io_qtemporaryfile.cpp 0
Reopening a QTemporaryFile after calling close() is safe. For as long as
the QTemporaryFile object itself is not destroyed, the unique temporary
file will exist and be kept open internally by QTemporaryFile.
The file name of the temporary file can be found by calling fileName().
Note that this is only defined after the file is first opened; the function
returns an empty string before this.
A temporary file will have some static part of the name and some
part that is calculated to be unique. The default filename \c
qt_temp will be placed into the temporary path as returned by
QDir::tempPath(). If you specify your own filename, a relative
file path will not be placed in the temporary directory by
default, but be relative to the current working directory.
Specified filenames can contain the following template \c XXXXXX
(six upper case "X" characters), which will be replaced by the
auto-generated portion of the filename. Note that the template is
case sensitive. If the template is not present in the filename,
QTemporaryFile appends the generated part to the filename given.
\sa QDir::tempPath(), QFile
*/
#ifdef QT_NO_QOBJECT
QTemporaryFile::QTemporaryFile()
: QFile(*new QTemporaryFilePrivate)
{
Q_D(QTemporaryFile);
d->templateName = QDir::tempPath() + QLatin1String("/qt_temp.XXXXXX");
}
QTemporaryFile::QTemporaryFile(const QString &templateName)
: QFile(*new QTemporaryFilePrivate)
{
Q_D(QTemporaryFile);
d->templateName = templateName;
}
#else
/*!
Constructs a QTemporaryFile in QDir::tempPath(), using the file template
"qt_temp.XXXXXX". The file is stored in the system's temporary directory.
\sa setFileTemplate(), QDir::tempPath()
*/
QTemporaryFile::QTemporaryFile()
: QFile(*new QTemporaryFilePrivate, 0)
{
Q_D(QTemporaryFile);
d->templateName = QDir::tempPath() + QLatin1String("/qt_temp.XXXXXX");
#ifdef Q_OS_SYMBIAN
//Just for verify that folder really exist on hardware
fileEngine()->mkdir( QDir::tempPath(), true );
#endif
}
/*!
Constructs a QTemporaryFile with a template filename of \a
templateName. Upon opening the temporary file this will be used to create
a unique filename.
If the \a templateName does not contain XXXXXX it will automatically be
appended and used as the dynamic portion of the filename.
If \a templateName is a relative path, the path will be relative to the
current working directory. You can use QDir::tempPath() to construct \a
templateName if you want use the system's temporary directory.
\sa open(), fileTemplate()
*/
QTemporaryFile::QTemporaryFile(const QString &templateName)
: QFile(*new QTemporaryFilePrivate, 0)
{
setFileTemplate(templateName);
}
/*!
Constructs a QTemporaryFile (with the given \a parent) in
QDir::tempPath(), using the file template "qt_temp.XXXXXX".
\sa setFileTemplate()
*/
QTemporaryFile::QTemporaryFile(QObject *parent)
: QFile(*new QTemporaryFilePrivate, parent)
{
Q_D(QTemporaryFile);
d->templateName = QDir::tempPath() + QLatin1String("/qt_temp.XXXXXX");
}
/*!
Constructs a QTemporaryFile with a template filename of \a
templateName and the specified \a parent.
Upon opening the temporary file this will be used to
create a unique filename.
If the \a templateName does not contain XXXXXX it will automatically be
appended and used as the dynamic portion of the filename.
If \a templateName is a relative path, the path will be relative to the
current working directory. You can use QDir::tempPath() to construct \a
templateName if you want use the system's temporary directory.
\sa open(), fileTemplate()
*/
QTemporaryFile::QTemporaryFile(const QString &templateName, QObject *parent)
: QFile(*new QTemporaryFilePrivate, parent)
{
setFileTemplate(templateName);
}
#endif
/*!
Destroys the temporary file object, the file is automatically
closed if necessary and if in auto remove mode it will
automatically delete the file.
\sa autoRemove()
*/
QTemporaryFile::~QTemporaryFile()
{
Q_D(QTemporaryFile);
close();
if (!d->fileName.isEmpty() && d->autoRemove)
remove();
}
/*!
\fn bool QTemporaryFile::open()
A QTemporaryFile will always be opened in QIODevice::ReadWrite mode,
this allows easy access to the data in the file. This function will
return true upon success and will set the fileName() to the unique
filename used.
\sa fileName()
*/
/*!
Returns true if the QTemporaryFile is in auto remove
mode. Auto-remove mode will automatically delete the filename from
disk upon destruction. This makes it very easy to create your
QTemporaryFile object on the stack, fill it with data, read from
it, and finally on function return it will automatically clean up
after itself.
Auto-remove is on by default.
\sa setAutoRemove(), remove()
*/
bool QTemporaryFile::autoRemove() const
{
Q_D(const QTemporaryFile);
return d->autoRemove;
}
/*!
Sets the QTemporaryFile into auto-remove mode if \a b is true.
Auto-remove is on by default.
\sa autoRemove(), remove()
*/
void QTemporaryFile::setAutoRemove(bool b)
{
Q_D(QTemporaryFile);
d->autoRemove = b;
}
/*!
Returns the complete unique filename backing the QTemporaryFile
object. This string is null before the QTemporaryFile is opened,
afterwards it will contain the fileTemplate() plus
additional characters to make it unique.
\sa fileTemplate()
*/
QString QTemporaryFile::fileName() const
{
Q_D(const QTemporaryFile);
if(d->fileName.isEmpty())
return QString();
return fileEngine()->fileName(QAbstractFileEngine::DefaultName);
}
/*!
Returns the set file template. The default file template will be
called qt_temp and be placed in QDir::tempPath().
\sa setFileTemplate()
*/
QString QTemporaryFile::fileTemplate() const
{
Q_D(const QTemporaryFile);
return d->templateName;
}
/*!
Sets the static portion of the file name to \a name. If the file
template ends in XXXXXX that will automatically be replaced with
the unique part of the filename, otherwise a filename will be
determined automatically based on the static portion specified.
If \a name contains a relative file path, the path will be relative to the
current working directory. You can use QDir::tempPath() to construct \a
name if you want use the system's temporary directory.
\sa fileTemplate()
*/
void QTemporaryFile::setFileTemplate(const QString &name)
{
Q_ASSERT(!isOpen());
Q_D(QTemporaryFile);
fileEngine()->setFileName(name);
d->templateName = name;
}
/*!
\fn QTemporaryFile *QTemporaryFile::createLocalFile(const QString &fileName)
\overload
Works on the given \a fileName rather than an existing QFile
object.
*/
/*!
If \a file is not on a local disk, a temporary file is created
on a local disk, \a file is copied into the temporary local file,
and a pointer to the temporary local file is returned. If \a file
is already on a local disk, a copy is not created and 0 is returned.
*/
QTemporaryFile *QTemporaryFile::createLocalFile(QFile &file)
{
if (QAbstractFileEngine *engine = file.fileEngine()) {
if(engine->fileFlags(QAbstractFileEngine::FlagsMask) & QAbstractFileEngine::LocalDiskFlag)
return 0; //local already
//cache
bool wasOpen = file.isOpen();
qint64 old_off = 0;
if(wasOpen)
old_off = file.pos();
else
file.open(QIODevice::ReadOnly);
//dump data
QTemporaryFile *ret = new QTemporaryFile;
ret->open();
file.seek(0);
char buffer[1024];
while(true) {
qint64 len = file.read(buffer, 1024);
if(len < 1)
break;
ret->write(buffer, len);
}
ret->seek(0);
//restore
if(wasOpen)
file.seek(old_off);
else
file.close();
//done
return ret;
}
return 0;
}
/*!
\internal
*/
QAbstractFileEngine *QTemporaryFile::fileEngine() const
{
Q_D(const QTemporaryFile);
if(!d->fileEngine) {
if (d->fileName.isEmpty())
d->fileEngine = new QTemporaryFileEngine(d->templateName);
else
d->fileEngine = new QTemporaryFileEngine(d->fileName, false);
}
return d->fileEngine;
}
/*!
\reimp
Creates a unique file name for the temporary file, and opens it. You can
get the unique name later by calling fileName(). The file is guaranteed to
have been created by this function (i.e., it has never existed before).
*/
bool QTemporaryFile::open(OpenMode flags)
{
Q_D(QTemporaryFile);
if (!d->fileName.isEmpty()) {
if (static_cast<QTemporaryFileEngine*>(fileEngine())->isReallyOpen()) {
setOpenMode(flags);
return true;
}
}
if (QFile::open(flags)) {
d->fileName = d->fileEngine->fileName(QAbstractFileEngine::DefaultName);
return true;
}
return false;
}
QT_END_NAMESPACE
#endif // QT_NO_TEMPORARYFILE
|