/[pcsx2_0.9.7]/trunk/3rdparty/wxWidgets/src/common/file.cpp
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Contents of /trunk/3rdparty/wxWidgets/src/common/file.cpp

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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 2 months ago) by william
File size: 14296 byte(s)
committing r3113 initial commit again...
1 /////////////////////////////////////////////////////////////////////////////
2 // Name: file.cpp
3 // Purpose: wxFile - encapsulates low-level "file descriptor"
4 // wxTempFile
5 // Author: Vadim Zeitlin
6 // Modified by:
7 // Created: 29/01/98
8 // RCS-ID: $Id: file.cpp 42876 2006-10-31 23:29:02Z SN $
9 // Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
10 // Licence: wxWindows licence
11 /////////////////////////////////////////////////////////////////////////////
12
13 // ----------------------------------------------------------------------------
14 // headers
15 // ----------------------------------------------------------------------------
16
17 // For compilers that support precompilation, includes "wx.h".
18 #include "wx/wxprec.h"
19
20 #ifdef __BORLANDC__
21 #pragma hdrstop
22 #endif
23
24 #if wxUSE_FILE
25
26 // standard
27 #if defined(__WXMSW__) && !defined(__GNUWIN32__) && !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
28
29 #ifndef __SALFORDC__
30 #define WIN32_LEAN_AND_MEAN
31 #define NOSERVICE
32 #define NOIME
33 #define NOATOM
34 #define NOGDI
35 #define NOGDICAPMASKS
36 #define NOMETAFILE
37 #define NOMINMAX
38 #define NOMSG
39 #define NOOPENFILE
40 #define NORASTEROPS
41 #define NOSCROLL
42 #define NOSOUND
43 #define NOSYSMETRICS
44 #define NOTEXTMETRIC
45 #define NOWH
46 #define NOCOMM
47 #define NOKANJI
48 #define NOCRYPT
49 #define NOMCX
50 #endif
51
52 #elif defined(__WXMSW__) && defined(__WXWINCE__)
53 #include "wx/msw/missing.h"
54 #elif (defined(__OS2__))
55 #include <io.h>
56 #elif (defined(__UNIX__) || defined(__GNUWIN32__))
57 #include <unistd.h>
58 #include <time.h>
59 #include <sys/stat.h>
60 #ifdef __GNUWIN32__
61 #include "wx/msw/wrapwin.h"
62 #endif
63 #elif defined(__DOS__)
64 #if defined(__WATCOMC__)
65 #include <io.h>
66 #elif defined(__DJGPP__)
67 #include <io.h>
68 #include <unistd.h>
69 #include <stdio.h>
70 #else
71 #error "Please specify the header with file functions declarations."
72 #endif
73 #elif (defined(__WXSTUBS__))
74 // Have to ifdef this for different environments
75 #include <io.h>
76 #elif (defined(__WXMAC__))
77 #if __MSL__ < 0x6000
78 int access( const char *path, int mode ) { return 0 ; }
79 #else
80 int _access( const char *path, int mode ) { return 0 ; }
81 #endif
82 char* mktemp( char * path ) { return path ;}
83 #include <stat.h>
84 #include <unistd.h>
85 #else
86 #error "Please specify the header with file functions declarations."
87 #endif //Win/UNIX
88
89 #include <stdio.h> // SEEK_xxx constants
90
91 // Windows compilers don't have these constants
92 #ifndef W_OK
93 enum
94 {
95 F_OK = 0, // test for existence
96 X_OK = 1, // execute permission
97 W_OK = 2, // write
98 R_OK = 4 // read
99 };
100 #endif // W_OK
101
102 #ifdef __SALFORDC__
103 #include <unix.h>
104 #endif
105
106 // some broken compilers don't have 3rd argument in open() and creat()
107 #ifdef __SALFORDC__
108 #define ACCESS(access)
109 #define stat _stat
110 #else // normal compiler
111 #define ACCESS(access) , (access)
112 #endif // Salford C
113
114 // wxWidgets
115 #ifndef WX_PRECOMP
116 #include "wx/string.h"
117 #include "wx/intl.h"
118 #include "wx/log.h"
119 #endif // !WX_PRECOMP
120
121 #include "wx/filename.h"
122 #include "wx/file.h"
123 #include "wx/filefn.h"
124
125 // there is no distinction between text and binary files under Unix, so define
126 // O_BINARY as 0 if the system headers don't do it already
127 #if defined(__UNIX__) && !defined(O_BINARY)
128 #define O_BINARY (0)
129 #endif //__UNIX__
130
131 #ifdef __WXMSW__
132 #include "wx/msw/mslu.h"
133 #endif
134
135 #ifdef __WXWINCE__
136 #include "wx/msw/private.h"
137 #endif
138
139 #ifndef MAX_PATH
140 #define MAX_PATH 512
141 #endif
142
143 // ============================================================================
144 // implementation of wxFile
145 // ============================================================================
146
147 // ----------------------------------------------------------------------------
148 // static functions
149 // ----------------------------------------------------------------------------
150
151 bool wxFile::Exists(const wxChar *name)
152 {
153 return wxFileExists(name);
154 }
155
156 bool wxFile::Access(const wxChar *name, OpenMode mode)
157 {
158 int how;
159
160 switch ( mode )
161 {
162 default:
163 wxFAIL_MSG(wxT("bad wxFile::Access mode parameter."));
164 // fall through
165
166 case read:
167 how = R_OK;
168 break;
169
170 case write:
171 how = W_OK;
172 break;
173
174 case read_write:
175 how = R_OK | W_OK;
176 break;
177 }
178
179 return wxAccess(name, how) == 0;
180 }
181
182 // ----------------------------------------------------------------------------
183 // opening/closing
184 // ----------------------------------------------------------------------------
185
186 // ctors
187 wxFile::wxFile(const wxChar *szFileName, OpenMode mode)
188 {
189 m_fd = fd_invalid;
190 m_error = false;
191
192 Open(szFileName, mode);
193 }
194
195 // create the file, fail if it already exists and bOverwrite
196 bool wxFile::Create(const wxChar *szFileName, bool bOverwrite, int accessMode)
197 {
198 // if bOverwrite we create a new file or truncate the existing one,
199 // otherwise we only create the new file and fail if it already exists
200 #if defined(__WXMAC__) && !defined(__UNIX__) && !wxUSE_UNICODE
201 // Dominic Mazzoni [dmazzoni+@cs.cmu.edu] reports that open is still broken on the mac, so we replace
202 // int fd = open( szFileName , O_CREAT | (bOverwrite ? O_TRUNC : O_EXCL), access);
203 int fd = creat( szFileName , accessMode);
204 #else
205 int fd = wxOpen( szFileName,
206 O_BINARY | O_WRONLY | O_CREAT |
207 (bOverwrite ? O_TRUNC : O_EXCL)
208 ACCESS(accessMode) );
209 #endif
210 if ( fd == -1 )
211 {
212 wxLogSysError(_("can't create file '%s'"), szFileName);
213 return false;
214 }
215
216 Attach(fd);
217 return true;
218 }
219
220 // open the file
221 bool wxFile::Open(const wxChar *szFileName, OpenMode mode, int accessMode)
222 {
223 int flags = O_BINARY;
224
225 switch ( mode )
226 {
227 case read:
228 flags |= O_RDONLY;
229 break;
230
231 case write_append:
232 if ( wxFile::Exists(szFileName) )
233 {
234 flags |= O_WRONLY | O_APPEND;
235 break;
236 }
237 //else: fall through as write_append is the same as write if the
238 // file doesn't exist
239
240 case write:
241 flags |= O_WRONLY | O_CREAT | O_TRUNC;
242 break;
243
244 case write_excl:
245 flags |= O_WRONLY | O_CREAT | O_EXCL;
246 break;
247
248 case read_write:
249 flags |= O_RDWR;
250 break;
251 }
252
253 #ifdef __WINDOWS__
254 // only read/write bits for "all" are supported by this function under
255 // Windows, and VC++ 8 returns EINVAL if any other bits are used in
256 // accessMode, so clear them as they have at best no effect anyhow
257 accessMode &= wxS_IRUSR | wxS_IWUSR;
258 #endif // __WINDOWS__
259
260 int fd = wxOpen( szFileName, flags ACCESS(accessMode));
261
262 if ( fd == -1 )
263 {
264 wxLogSysError(_("can't open file '%s'"), szFileName);
265 return false;
266 }
267
268 Attach(fd);
269 return true;
270 }
271
272 // close
273 bool wxFile::Close()
274 {
275 if ( IsOpened() ) {
276 if (wxClose(m_fd) == -1)
277 {
278 wxLogSysError(_("can't close file descriptor %d"), m_fd);
279 m_fd = fd_invalid;
280 return false;
281 }
282 else
283 m_fd = fd_invalid;
284 }
285
286 return true;
287 }
288
289 // ----------------------------------------------------------------------------
290 // read/write
291 // ----------------------------------------------------------------------------
292
293 // read
294 ssize_t wxFile::Read(void *pBuf, size_t nCount)
295 {
296 wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
297
298 ssize_t iRc = wxRead(m_fd, pBuf, nCount);
299
300 if ( iRc == -1 )
301 {
302 wxLogSysError(_("can't read from file descriptor %d"), m_fd);
303 return wxInvalidOffset;
304 }
305
306 return iRc;
307 }
308
309 // write
310 size_t wxFile::Write(const void *pBuf, size_t nCount)
311 {
312 wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
313
314 ssize_t iRc = wxWrite(m_fd, pBuf, nCount);
315
316 if ( iRc == -1 )
317 {
318 wxLogSysError(_("can't write to file descriptor %d"), m_fd);
319 m_error = true;
320 iRc = 0;
321 }
322
323 return iRc;
324 }
325
326 // flush
327 bool wxFile::Flush()
328 {
329 #ifdef HAVE_FSYNC
330 // fsync() only works on disk files and returns errors for pipes, don't
331 // call it then
332 if ( IsOpened() && GetKind() == wxFILE_KIND_DISK )
333 {
334 if ( wxFsync(m_fd) == -1 )
335 {
336 wxLogSysError(_("can't flush file descriptor %d"), m_fd);
337 return false;
338 }
339 }
340 #endif // HAVE_FSYNC
341
342 return true;
343 }
344
345 // ----------------------------------------------------------------------------
346 // seek
347 // ----------------------------------------------------------------------------
348
349 // seek
350 wxFileOffset wxFile::Seek(wxFileOffset ofs, wxSeekMode mode)
351 {
352 wxASSERT_MSG( IsOpened(), _T("can't seek on closed file") );
353 wxCHECK_MSG( ofs != wxInvalidOffset || mode != wxFromStart,
354 wxInvalidOffset,
355 _T("invalid absolute file offset") );
356
357 int origin;
358 switch ( mode ) {
359 default:
360 wxFAIL_MSG(_("unknown seek origin"));
361
362 case wxFromStart:
363 origin = SEEK_SET;
364 break;
365
366 case wxFromCurrent:
367 origin = SEEK_CUR;
368 break;
369
370 case wxFromEnd:
371 origin = SEEK_END;
372 break;
373 }
374
375 wxFileOffset iRc = wxSeek(m_fd, ofs, origin);
376 if ( iRc == wxInvalidOffset )
377 {
378 wxLogSysError(_("can't seek on file descriptor %d"), m_fd);
379 }
380
381 return iRc;
382 }
383
384 // get current file offset
385 wxFileOffset wxFile::Tell() const
386 {
387 wxASSERT( IsOpened() );
388
389 wxFileOffset iRc = wxTell(m_fd);
390 if ( iRc == wxInvalidOffset )
391 {
392 wxLogSysError(_("can't get seek position on file descriptor %d"), m_fd);
393 }
394
395 return iRc;
396 }
397
398 // get current file length
399 wxFileOffset wxFile::Length() const
400 {
401 wxASSERT( IsOpened() );
402
403 wxFileOffset iRc = Tell();
404 if ( iRc != wxInvalidOffset ) {
405 // have to use const_cast :-(
406 wxFileOffset iLen = ((wxFile *)this)->SeekEnd();
407 if ( iLen != wxInvalidOffset ) {
408 // restore old position
409 if ( ((wxFile *)this)->Seek(iRc) == wxInvalidOffset ) {
410 // error
411 iLen = wxInvalidOffset;
412 }
413 }
414
415 iRc = iLen;
416 }
417
418 if ( iRc == wxInvalidOffset )
419 {
420 wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd);
421 }
422
423 return iRc;
424 }
425
426 // is end of file reached?
427 bool wxFile::Eof() const
428 {
429 wxASSERT( IsOpened() );
430
431 wxFileOffset iRc;
432
433 #if defined(__DOS__) || defined(__UNIX__) || defined(__GNUWIN32__) || defined( __MWERKS__ ) || defined(__SALFORDC__)
434 // @@ this doesn't work, of course, on unseekable file descriptors
435 wxFileOffset ofsCur = Tell(),
436 ofsMax = Length();
437 if ( ofsCur == wxInvalidOffset || ofsMax == wxInvalidOffset )
438 iRc = wxInvalidOffset;
439 else
440 iRc = ofsCur == ofsMax;
441 #else // Windows and "native" compiler
442 iRc = wxEof(m_fd);
443 #endif // Windows/Unix
444
445 if ( iRc == 1)
446 {}
447 else if ( iRc == 0 )
448 return false;
449 else if ( iRc == wxInvalidOffset )
450 wxLogSysError(_("can't determine if the end of file is reached on descriptor %d"), m_fd);
451 else
452 wxFAIL_MSG(_("invalid eof() return value."));
453
454 return true;
455 }
456
457 // ============================================================================
458 // implementation of wxTempFile
459 // ============================================================================
460
461 // ----------------------------------------------------------------------------
462 // construction
463 // ----------------------------------------------------------------------------
464
465 wxTempFile::wxTempFile(const wxString& strName)
466 {
467 Open(strName);
468 }
469
470 bool wxTempFile::Open(const wxString& strName)
471 {
472 // we must have an absolute filename because otherwise CreateTempFileName()
473 // would create the temp file in $TMP (i.e. the system standard location
474 // for the temp files) which might be on another volume/drive/mount and
475 // wxRename()ing it later to m_strName from Commit() would then fail
476 //
477 // with the absolute filename, the temp file is created in the same
478 // directory as this one which ensures that wxRename() may work later
479 wxFileName fn(strName);
480 if ( !fn.IsAbsolute() )
481 {
482 fn.Normalize(wxPATH_NORM_ABSOLUTE);
483 }
484
485 m_strName = fn.GetFullPath();
486
487 m_strTemp = wxFileName::CreateTempFileName(m_strName, &m_file);
488
489 if ( m_strTemp.empty() )
490 {
491 // CreateTempFileName() failed
492 return false;
493 }
494
495 #ifdef __UNIX__
496 // the temp file should have the same permissions as the original one
497 mode_t mode;
498
499 wxStructStat st;
500 if ( stat( (const char*) m_strName.fn_str(), &st) == 0 )
501 {
502 mode = st.st_mode;
503 }
504 else
505 {
506 // file probably didn't exist, just give it the default mode _using_
507 // user's umask (new files creation should respect umask)
508 mode_t mask = umask(0777);
509 mode = 0666 & ~mask;
510 umask(mask);
511 }
512
513 if ( chmod( (const char*) m_strTemp.fn_str(), mode) == -1 )
514 {
515 #ifndef __OS2__
516 wxLogSysError(_("Failed to set temporary file permissions"));
517 #endif
518 }
519 #endif // Unix
520
521 return true;
522 }
523
524 // ----------------------------------------------------------------------------
525 // destruction
526 // ----------------------------------------------------------------------------
527
528 wxTempFile::~wxTempFile()
529 {
530 if ( IsOpened() )
531 Discard();
532 }
533
534 bool wxTempFile::Commit()
535 {
536 m_file.Close();
537
538 if ( wxFile::Exists(m_strName) && wxRemove(m_strName) != 0 ) {
539 wxLogSysError(_("can't remove file '%s'"), m_strName.c_str());
540 return false;
541 }
542
543 if ( !wxRenameFile(m_strTemp, m_strName) ) {
544 wxLogSysError(_("can't commit changes to file '%s'"), m_strName.c_str());
545 return false;
546 }
547
548 return true;
549 }
550
551 void wxTempFile::Discard()
552 {
553 m_file.Close();
554 if ( wxRemove(m_strTemp) != 0 )
555 wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str());
556 }
557
558 #endif // wxUSE_FILE
559

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