src/common/filesys.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/filesys.cpp
   3 // Purpose:     wxFileSystem class - interface for opening files
   4 // Author:      Vaclav Slavik
   5 // Copyright:   (c) 1999 Vaclav Slavik
   6 // CVS-ID:      $Id$
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #include "wx/wxprec.h"
  11
  12 #ifdef __BORLANDC__
  13     #pragma hdrstop
  14 #endif
  15
  16
  17 #if wxUSE_FILESYSTEM
  18
  19 #include "wx/filesys.h"
  20
  21 #ifndef WX_PRECOMP
  22     #include "wx/log.h"
  23     #include "wx/module.h"
  24 #endif
  25
  26 #include "wx/sysopt.h"
  27 #include "wx/wfstream.h"
  28 #include "wx/mimetype.h"
  29 #include "wx/filename.h"
  30 #include "wx/tokenzr.h"
  31 #include "wx/uri.h"
  32 #include "wx/private/fileback.h"
  33
  34 // ----------------------------------------------------------------------------
  35 // wxFSFile
  36 // ----------------------------------------------------------------------------
  37
  38 const wxString& wxFSFile::GetMimeType() const
  39 {
  40     if ( m_MimeType.empty() && !m_Location.empty() )
  41     {
  42         wxConstCast(this, wxFSFile)->m_MimeType =
  43             wxFileSystemHandler::GetMimeTypeFromExt(m_Location);
  44     }
  45
  46     return m_MimeType;
  47 }
  48
  49 // ----------------------------------------------------------------------------
  50 // wxFileSystemHandler
  51 // ----------------------------------------------------------------------------
  52
  53 IMPLEMENT_ABSTRACT_CLASS(wxFileSystemHandler, wxObject)
  54
  55
  56 /* static */
  57 wxString wxFileSystemHandler::GetMimeTypeFromExt(const wxString& location)
  58 {
  59     wxString ext, mime;
  60     wxString loc = GetRightLocation(location);
  61     wxChar c;
  62     int l = loc.length(), l2;
  63
  64     l2 = l;
  65     for (int i = l-1; i >= 0; i--)
  66     {
  67         c = loc[(unsigned int) i];
  68         if ( c == wxT('#') )
  69             l2 = i + 1;
  70         if ( c == wxT('.') )
  71         {
  72             ext = loc.Right(l2-i-1);
  73             break;
  74         }
  75         if ( (c == wxT('/')) || (c == wxT('\\')) || (c == wxT(':')) )
  76             return wxEmptyString;
  77     }
  78
  79 #if wxUSE_MIMETYPE
  80     static bool s_MinimalMimeEnsured = false;
  81
  82     // Don't use mime types manager if the application doesn't need it and it would be
  83     // cause an unacceptable delay, especially on startup.
  84 #if wxUSE_SYSTEM_OPTIONS
  85     if ( !wxSystemOptions::GetOptionInt(wxT("filesys.no-mimetypesmanager")) )
  86 #endif
  87     {
  88         if (!s_MinimalMimeEnsured)
  89         {
  90             static const wxFileTypeInfo fallbacks[] =
  91             {
  92                 wxFileTypeInfo(_T("image/jpeg"),
  93                     wxEmptyString,
  94                     wxEmptyString,
  95                     _T("JPEG image (from fallback)"),
  96                     _T("jpg"), _T("jpeg"), _T("JPG"), _T("JPEG"), wxNullPtr),
  97                 wxFileTypeInfo(_T("image/gif"),
  98                     wxEmptyString,
  99                     wxEmptyString,
 100                     _T("GIF image (from fallback)"),
 101                     _T("gif"), _T("GIF"), wxNullPtr),
 102                 wxFileTypeInfo(_T("image/png"),
 103                     wxEmptyString,
 104                     wxEmptyString,
 105                     _T("PNG image (from fallback)"),
 106                     _T("png"), _T("PNG"), wxNullPtr),
 107                 wxFileTypeInfo(_T("image/bmp"),
 108                     wxEmptyString,
 109                     wxEmptyString,
 110                     _T("windows bitmap image (from fallback)"),
 111                     _T("bmp"), _T("BMP"), wxNullPtr),
 112                 wxFileTypeInfo(_T("text/html"),
 113                     wxEmptyString,
 114                     wxEmptyString,
 115                     _T("HTML document (from fallback)"),
 116                     _T("htm"), _T("html"), _T("HTM"), _T("HTML"), wxNullPtr),
 117                 // must terminate the table with this!
 118                 wxFileTypeInfo()
 119             };
 120             wxTheMimeTypesManager->AddFallbacks(fallbacks);
 121             s_MinimalMimeEnsured = true;
 122         }
 123
 124         wxFileType *ft = wxTheMimeTypesManager->GetFileTypeFromExtension(ext);
 125         if ( !ft || !ft -> GetMimeType(&mime) )
 126         {
 127             mime = wxEmptyString;
 128         }
 129
 130         delete ft;
 131
 132         return mime;
 133     }
 134     else
 135 #endif
 136     {
 137         if ( ext.IsSameAs(wxT("htm"), false) || ext.IsSameAs(_T("html"), false) )
 138             return wxT("text/html");
 139         if ( ext.IsSameAs(wxT("jpg"), false) || ext.IsSameAs(_T("jpeg"), false) )
 140             return wxT("image/jpeg");
 141         if ( ext.IsSameAs(wxT("gif"), false) )
 142             return wxT("image/gif");
 143         if ( ext.IsSameAs(wxT("png"), false) )
 144             return wxT("image/png");
 145         if ( ext.IsSameAs(wxT("bmp"), false) )
 146             return wxT("image/bmp");
 147         return wxEmptyString;
 148     }
 149 }
 150
 151
 152
 153 /* static */
 154 wxString wxFileSystemHandler::GetProtocol(const wxString& location)
 155 {
 156     wxString s = wxEmptyString;
 157     int i, l = location.length();
 158     bool fnd = false;
 159
 160     for (i = l-1; (i >= 0) && ((location[i] != wxT('#')) || (!fnd)); i--) {
 161         if ((location[i] == wxT(':')) && (i != 1 /*win: C:\path*/)) fnd = true;
 162     }
 163     if (!fnd) return wxT("file");
 164     for (++i; (i < l) && (location[i] != wxT(':')); i++) s << location[i];
 165     return s;
 166 }
 167
 168
 169 /* static */
 170 wxString wxFileSystemHandler::GetLeftLocation(const wxString& location)
 171 {
 172     int i;
 173     bool fnd = false;
 174
 175     for (i = location.length()-1; i >= 0; i--) {
 176         if ((location[i] == wxT(':')) && (i != 1 /*win: C:\path*/)) fnd = true;
 177         else if (fnd && (location[i] == wxT('#'))) return location.Left(i);
 178     }
 179     return wxEmptyString;
 180 }
 181
 182 /* static */
 183 wxString wxFileSystemHandler::GetRightLocation(const wxString& location)
 184 {
 185     int i, l = location.length();
 186     int l2 = l + 1;
 187
 188     for (i = l-1;
 189          (i >= 0) &&
 190          ((location[i] != wxT(':')) || (i == 1) || (location[i-2] == wxT(':')));
 191          i--)
 192     {
 193         if (location[i] == wxT('#')) l2 = i + 1;
 194     }
 195     if (i == 0) return wxEmptyString;
 196     else return location.Mid(i + 1, l2 - i - 2);
 197 }
 198
 199 /* static */
 200 wxString wxFileSystemHandler::GetAnchor(const wxString& location)
 201 {
 202     wxChar c;
 203     int l = location.length();
 204
 205     for (int i = l-1; i >= 0; i--) {
 206         c = location[i];
 207         if (c == wxT('#'))
 208             return location.Right(l-i-1);
 209         else if ((c == wxT('/')) || (c == wxT('\\')) || (c == wxT(':')))
 210             return wxEmptyString;
 211     }
 212     return wxEmptyString;
 213 }
 214
 215
 216 wxString wxFileSystemHandler::FindFirst(const wxString& WXUNUSED(spec),
 217                                         int WXUNUSED(flags))
 218 {
 219     return wxEmptyString;
 220 }
 221
 222 wxString wxFileSystemHandler::FindNext()
 223 {
 224     return wxEmptyString;
 225 }
 226
 227 //--------------------------------------------------------------------------------
 228 // wxLocalFSHandler
 229 //--------------------------------------------------------------------------------
 230
 231
 232 wxString wxLocalFSHandler::ms_root;
 233
 234 bool wxLocalFSHandler::CanOpen(const wxString& location)
 235 {
 236     return GetProtocol(location) == wxT("file");
 237 }
 238
 239 wxFSFile* wxLocalFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
 240 {
 241     // location has Unix path separators
 242     wxString right = GetRightLocation(location);
 243     wxFileName fn = wxFileSystem::URLToFileName(right);
 244     wxString fullpath = ms_root + fn.GetFullPath();
 245
 246     if (!wxFileExists(fullpath))
 247         return (wxFSFile*) NULL;
 248
 249     // we need to check whether we can really read from this file, otherwise
 250     // wxFSFile is not going to work
 251 #if wxUSE_FFILE
 252     wxFFileInputStream *is = new wxFFileInputStream(fullpath);
 253 #elif wxUSE_FILE
 254     wxFileInputStream *is = new wxFileInputStream(fullpath);
 255 #else
 256 #error One of wxUSE_FILE or wxUSE_FFILE must be set to 1 for wxFSHandler to work
 257 #endif
 258     if ( !is->Ok() )
 259     {
 260         delete is;
 261         return (wxFSFile*) NULL;
 262     }
 263
 264     return new wxFSFile(is,
 265                         right,
 266                         wxEmptyString,
 267                         GetAnchor(location)
 268 #if wxUSE_DATETIME
 269                         ,wxDateTime(wxFileModificationTime(fullpath))
 270 #endif // wxUSE_DATETIME
 271                         );
 272 }
 273
 274 wxString wxLocalFSHandler::FindFirst(const wxString& spec, int flags)
 275 {
 276     wxFileName fn = wxFileSystem::URLToFileName(GetRightLocation(spec));
 277     return wxFindFirstFile(ms_root + fn.GetFullPath(), flags);
 278 }
 279
 280 wxString wxLocalFSHandler::FindNext()
 281 {
 282     return wxFindNextFile();
 283 }
 284
 285
 286
 287 //-----------------------------------------------------------------------------
 288 // wxFileSystem
 289 //-----------------------------------------------------------------------------
 290
 291 IMPLEMENT_DYNAMIC_CLASS(wxFileSystem, wxObject)
 292 IMPLEMENT_ABSTRACT_CLASS(wxFSFile, wxObject)
 293
 294
 295 wxList wxFileSystem::m_Handlers;
 296
 297
 298 wxFileSystem::~wxFileSystem()
 299 {
 300     WX_CLEAR_HASH_MAP(wxFSHandlerHash, m_LocalHandlers)
 301 }
 302
 303
 304 static wxString MakeCorrectPath(const wxString& path)
 305 {
 306     wxString p(path);
 307     wxString r;
 308     int i, j, cnt;
 309
 310     cnt = p.length();
 311     for (i = 0; i < cnt; i++)
 312       if (p.GetChar(i) == wxT('\\')) p.GetWritableChar(i) = wxT('/'); // Want to be windows-safe
 313
 314     if (p.Left(2) == wxT("./")) { p = p.Mid(2); cnt -= 2; }
 315
 316     if (cnt < 3) return p;
 317
 318     r << p.GetChar(0) << p.GetChar(1);
 319
 320     // skip trailing ../.., if any
 321     for (i = 2; i < cnt && (p.GetChar(i) == wxT('/') || p.GetChar(i) == wxT('.')); i++) r << p.GetChar(i);
 322
 323     // remove back references: translate dir1/../dir2 to dir2
 324     for (; i < cnt; i++)
 325     {
 326         r << p.GetChar(i);
 327         if (p.GetChar(i) == wxT('/') && p.GetChar(i-1) == wxT('.') && p.GetChar(i-2) == wxT('.'))
 328         {
 329             for (j = r.length() - 2; j >= 0 && r.GetChar(j) != wxT('/') && r.GetChar(j) != wxT(':'); j--) {}
 330             if (j >= 0 && r.GetChar(j) != wxT(':'))
 331             {
 332                 for (j = j - 1; j >= 0 && r.GetChar(j) != wxT('/') && r.GetChar(j) != wxT(':'); j--) {}
 333                 r.Remove(j + 1);
 334             }
 335         }
 336     }
 337
 338     for (; i < cnt; i++) r << p.GetChar(i);
 339
 340     return r;
 341 }
 342
 343
 344 void wxFileSystem::ChangePathTo(const wxString& location, bool is_dir)
 345 {
 346     int i, pathpos = -1;
 347
 348     m_Path = MakeCorrectPath(location);
 349
 350     if (is_dir)
 351     {
 352         if (m_Path.length() > 0 && m_Path.Last() != wxT('/') && m_Path.Last() != wxT(':'))
 353             m_Path << wxT('/');
 354     }
 355
 356     else
 357     {
 358         for (i = m_Path.length()-1; i >= 0; i--)
 359         {
 360             if (m_Path[(unsigned int) i] == wxT('/'))
 361             {
 362                 if ((i > 1) && (m_Path[(unsigned int) (i-1)] == wxT('/')) && (m_Path[(unsigned int) (i-2)] == wxT(':')))
 363                 {
 364                     i -= 2;
 365                     continue;
 366                 }
 367                 else
 368                 {
 369                     pathpos = i;
 370                     break;
 371                 }
 372             }
 373             else if (m_Path[(unsigned int) i] == wxT(':')) {
 374                 pathpos = i;
 375                 break;
 376             }
 377         }
 378         if (pathpos == -1)
 379         {
 380             for (i = 0; i < (int) m_Path.length(); i++)
 381             {
 382                 if (m_Path[(unsigned int) i] == wxT(':'))
 383                 {
 384                     m_Path.Remove(i+1);
 385                     break;
 386                 }
 387             }
 388             if (i == (int) m_Path.length())
 389                 m_Path = wxEmptyString;
 390         }
 391         else
 392         {
 393             m_Path.Remove(pathpos+1);
 394         }
 395     }
 396 }
 397
 398
 399
 400 wxFileSystemHandler *wxFileSystem::MakeLocal(wxFileSystemHandler *h)
 401 {
 402     wxClassInfo *classinfo = h->GetClassInfo();
 403
 404     if (classinfo->IsDynamic())
 405     {
 406         wxFileSystemHandler*& local = m_LocalHandlers[classinfo];
 407         if (!local)
 408             local = (wxFileSystemHandler*)classinfo->CreateObject();
 409         return local;
 410     }
 411     else
 412     {
 413         return h;
 414     }
 415 }
 416
 417
 418
 419 wxFSFile* wxFileSystem::OpenFile(const wxString& location, int flags)
 420 {
 421     if ((flags & wxFS_READ) == 0)
 422         return NULL;
 423
 424     wxString loc = MakeCorrectPath(location);
 425     unsigned i, ln;
 426     wxChar meta;
 427     wxFSFile *s = NULL;
 428     wxList::compatibility_iterator node;
 429
 430     ln = loc.length();
 431     meta = 0;
 432     for (i = 0; i < ln; i++)
 433     {
 434         switch ( loc[i].GetValue() )
 435         {
 436             case wxT('/') : case wxT(':') : case wxT('#') :
 437                 meta = loc[i];
 438                 break;
 439         }
 440         if (meta != 0) break;
 441     }
 442     m_LastName = wxEmptyString;
 443
 444     // try relative paths first :
 445     if (meta != wxT(':'))
 446     {
 447         node = m_Handlers.GetFirst();
 448         while (node)
 449         {
 450             wxFileSystemHandler *h = (wxFileSystemHandler*) node -> GetData();
 451             if (h->CanOpen(m_Path + loc))
 452             {
 453                 s = MakeLocal(h)->OpenFile(*this, m_Path + loc);
 454                 if (s) { m_LastName = m_Path + loc; break; }
 455             }
 456             node = node->GetNext();
 457         }
 458     }
 459
 460     // if failed, try absolute paths :
 461     if (s == NULL)
 462     {
 463         node = m_Handlers.GetFirst();
 464         while (node)
 465         {
 466             wxFileSystemHandler *h = (wxFileSystemHandler*) node->GetData();
 467             if (h->CanOpen(loc))
 468             {
 469                 s = MakeLocal(h)->OpenFile(*this, loc);
 470                 if (s) { m_LastName = loc; break; }
 471             }
 472             node = node->GetNext();
 473         }
 474     }
 475
 476     if (s && (flags & wxFS_SEEKABLE) != 0 && !s->GetStream()->IsSeekable())
 477     {
 478         wxBackedInputStream *stream;
 479         stream = new wxBackedInputStream(s->DetachStream());
 480         stream->FindLength();
 481         s->SetStream(stream);
 482     }
 483
 484     return (s);
 485 }
 486
 487
 488
 489 wxString wxFileSystem::FindFirst(const wxString& spec, int flags)
 490 {
 491     wxList::compatibility_iterator node;
 492     wxString spec2(spec);
 493
 494     m_FindFileHandler = NULL;
 495
 496     for (int i = spec2.length()-1; i >= 0; i--)
 497         if (spec2[(unsigned int) i] == wxT('\\')) spec2.GetWritableChar(i) = wxT('/'); // Want to be windows-safe
 498
 499     node = m_Handlers.GetFirst();
 500     while (node)
 501     {
 502         wxFileSystemHandler *h = (wxFileSystemHandler*) node -> GetData();
 503         if (h -> CanOpen(m_Path + spec2))
 504         {
 505             m_FindFileHandler = MakeLocal(h);
 506             return m_FindFileHandler -> FindFirst(m_Path + spec2, flags);
 507         }
 508         node = node->GetNext();
 509     }
 510
 511     node = m_Handlers.GetFirst();
 512     while (node)
 513     {
 514         wxFileSystemHandler *h = (wxFileSystemHandler*) node -> GetData();
 515         if (h -> CanOpen(spec2))
 516         {
 517             m_FindFileHandler = MakeLocal(h);
 518             return m_FindFileHandler -> FindFirst(spec2, flags);
 519         }
 520         node = node->GetNext();
 521     }
 522
 523     return wxEmptyString;
 524 }
 525
 526
 527
 528 wxString wxFileSystem::FindNext()
 529 {
 530     if (m_FindFileHandler == NULL) return wxEmptyString;
 531     else return m_FindFileHandler -> FindNext();
 532 }
 533
 534 bool wxFileSystem::FindFileInPath(wxString *pStr,
 535                                   const wxString& path,
 536                                   const wxString& basename)
 537 {
 538     // we assume that it's not empty
 539     wxCHECK_MSG( !basename.empty(), false,
 540                 _T("empty file name in wxFileSystem::FindFileInPath"));
 541
 542     wxString name;
 543     // skip path separator in the beginning of the file name if present
 544     if ( wxIsPathSeparator(basename[0u]) )
 545         name = basename.substr(1);
 546     else
 547         name = basename;
 548
 549     wxStringTokenizer tokenizer(path, wxPATH_SEP);
 550     while ( tokenizer.HasMoreTokens() )
 551     {
 552         wxString strFile = tokenizer.GetNextToken();
 553         if ( !wxEndsWithPathSeparator(strFile) )
 554             strFile += wxFILE_SEP_PATH;
 555         strFile += name;
 556
 557         wxFSFile *file = OpenFile(strFile);
 558         if ( file )
 559         {
 560             delete file;
 561             *pStr = strFile;
 562             return true;
 563         }
 564     }
 565
 566     return false;
 567 }
 568
 569 void wxFileSystem::AddHandler(wxFileSystemHandler *handler)
 570 {
 571     // prepend the handler to the beginning of the list because handlers added
 572     // last should have the highest priority to allow overriding them
 573     m_Handlers.Insert((size_t)0, handler);
 574 }
 575
 576 wxFileSystemHandler* wxFileSystem::RemoveHandler(wxFileSystemHandler *handler)
 577 {
 578     // if handler has already been removed (or deleted)
 579     // we return NULL. This is by design in case
 580     // CleanUpHandlers() is called before RemoveHandler
 581     // is called, as we cannot control the order
 582     // which modules are unloaded
 583     if (!m_Handlers.DeleteObject(handler))
 584         return NULL;
 585
 586     return handler;
 587 }
 588
 589
 590 bool wxFileSystem::HasHandlerForPath(const wxString &location)
 591 {
 592     for ( wxList::compatibility_iterator node = m_Handlers.GetFirst();
 593            node; node = node->GetNext() )
 594     {
 595         wxFileSystemHandler *h = (wxFileSystemHandler*) node->GetData();
 596         if (h->CanOpen(location))
 597             return true;
 598     }
 599
 600     return false;
 601 }
 602
 603 void wxFileSystem::CleanUpHandlers()
 604 {
 605     WX_CLEAR_LIST(wxList, m_Handlers);
 606 }
 607
 608 static const wxString g_unixPathString(wxT("/"));
 609 static const wxString g_nativePathString(wxFILE_SEP_PATH);
 610
 611 // Returns the native path for a file URL
 612 wxFileName wxFileSystem::URLToFileName(const wxString& url)
 613 {
 614     wxString path = url;
 615
 616     if ( path.Find(wxT("file://")) == 0 )
 617     {
 618         path = path.Mid(7);
 619     }
 620     else if ( path.Find(wxT("file:")) == 0 )
 621     {
 622         path = path.Mid(5);
 623     }
 624     // Remove preceding double slash on Mac Classic
 625 #if defined(__WXMAC__) && !defined(__UNIX__)
 626     else if ( path.Find(wxT("//")) == 0 )
 627         path = path.Mid(2);
 628 #endif
 629
 630     path = wxURI::Unescape(path);
 631
 632 #ifdef __WXMSW__
 633     // file urls either start with a forward slash (local harddisk),
 634     // otherwise they have a servername/sharename notation,
 635     // which only exists on msw and corresponds to a unc
 636     if ( path[0u] == wxT('/') && path [1u] != wxT('/'))
 637     {
 638         path = path.Mid(1);
 639     }
 640     else if ( (url.Find(wxT("file://")) == 0) &&
 641               (path.Find(wxT('/')) != wxNOT_FOUND) &&
 642               (path.length() > 1) && (path[1u] != wxT(':')) )
 643     {
 644         path = wxT("//") + path;
 645     }
 646 #endif
 647
 648     path.Replace(g_unixPathString, g_nativePathString);
 649
 650     return wxFileName(path, wxPATH_NATIVE);
 651 }
 652
 653 // Returns the file URL for a native path
 654 wxString wxFileSystem::FileNameToURL(const wxFileName& filename)
 655 {
 656     wxFileName fn = filename;
 657     fn.Normalize(wxPATH_NORM_DOTS | wxPATH_NORM_TILDE | wxPATH_NORM_ABSOLUTE);
 658     wxString url = fn.GetFullPath(wxPATH_NATIVE);
 659
 660 #ifndef __UNIX__
 661     // unc notation, wxMSW
 662     if ( url.Find(wxT("\\\\")) == 0 )
 663     {
 664         url = wxT("//") + url.Mid(2);
 665     }
 666     else
 667     {
 668         url = wxT("/") + url;
 669 #ifdef __WXMAC__
 670         url = wxT("/") + url;
 671 #endif
 672
 673     }
 674 #endif
 675
 676     url.Replace(g_nativePathString, g_unixPathString);
 677     url.Replace(wxT("%"), wxT("%25")); // '%'s must be replaced first!
 678     url.Replace(wxT("#"), wxT("%23"));
 679
 680     // notice that all colons *must* be encoded in the paths used by
 681     // wxFileSystem even though this makes URLs produced by this method
 682     // unusable with IE under Windows as it requires "file:///c:/foo.bar" and
 683     // doesn't accept "file:///c%3a/foo.bar" -- but then we never made any
 684     // guarantees about general suitability of the strings returned by this
 685     // method, they must work with wxFileSystem only and not encoding the colon
 686     // breaks handling of "http://wherever/whatever.zip#zip:filename.ext" URLs
 687     // so we really can't do this without heavy changes to the parsing code
 688     // here, in particular in GetRightLocation()
 689     url.Replace(wxT(":"), wxT("%3A"));
 690     url = wxT("file:") + url;
 691     return url;
 692 }
 693
 694
 695 ///// Module:
 696
 697 class wxFileSystemModule : public wxModule
 698 {
 699     DECLARE_DYNAMIC_CLASS(wxFileSystemModule)
 700
 701     public:
 702         wxFileSystemModule() :
 703             wxModule(),
 704             m_handler(NULL)
 705         {
 706         }
 707
 708         virtual bool OnInit()
 709         {
 710             m_handler = new wxLocalFSHandler;
 711             wxFileSystem::AddHandler(m_handler);
 712             return true;
 713         }
 714         virtual void OnExit()
 715         {
 716             delete wxFileSystem::RemoveHandler(m_handler);
 717
 718             wxFileSystem::CleanUpHandlers();
 719         }
 720
 721     private:
 722         wxFileSystemHandler* m_handler;
 723
 724 };
 725
 726 IMPLEMENT_DYNAMIC_CLASS(wxFileSystemModule, wxModule)
 727
 728 #endif
 729   // wxUSE_FILESYSTEM