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(wxT("image/jpeg"),
  93                     wxEmptyString,
  94                     wxEmptyString,
  95                     wxT("JPEG image (from fallback)"),
  96                     wxT("jpg"), wxT("jpeg"), wxT("JPG"), wxT("JPEG"), wxNullPtr),
  97                 wxFileTypeInfo(wxT("image/gif"),
  98                     wxEmptyString,
  99                     wxEmptyString,
 100                     wxT("GIF image (from fallback)"),
 101                     wxT("gif"), wxT("GIF"), wxNullPtr),
 102                 wxFileTypeInfo(wxT("image/png"),
 103                     wxEmptyString,
 104                     wxEmptyString,
 105                     wxT("PNG image (from fallback)"),
 106                     wxT("png"), wxT("PNG"), wxNullPtr),
 107                 wxFileTypeInfo(wxT("image/bmp"),
 108                     wxEmptyString,
 109                     wxEmptyString,
 110                     wxT("windows bitmap image (from fallback)"),
 111                     wxT("bmp"), wxT("BMP"), wxNullPtr),
 112                 wxFileTypeInfo(wxT("text/html"),
 113                     wxEmptyString,
 114                     wxEmptyString,
 115                     wxT("HTML document (from fallback)"),
 116                     wxT("htm"), wxT("html"), wxT("HTM"), wxT("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(wxT("html"), false) )
 138             return wxT("text/html");
 139         if ( ext.IsSameAs(wxT("jpg"), false) || ext.IsSameAs(wxT("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 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->IsOk() )
 259     {
 260         delete is;
 261         return 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     const wxString found = wxFindFirstFile(ms_root + fn.GetFullPath(), flags);
 278     if ( found.empty() )
 279         return found;
 280     return wxFileSystem::FileNameToURL(found);
 281 }
 282
 283 wxString wxLocalFSHandler::FindNext()
 284 {
 285     const wxString found = wxFindNextFile();
 286     if ( found.empty() )
 287         return found;
 288     return wxFileSystem::FileNameToURL(found);
 289 }
 290
 291
 292
 293 //-----------------------------------------------------------------------------
 294 // wxFileSystem
 295 //-----------------------------------------------------------------------------
 296
 297 IMPLEMENT_DYNAMIC_CLASS(wxFileSystem, wxObject)
 298 IMPLEMENT_ABSTRACT_CLASS(wxFSFile, wxObject)
 299
 300
 301 wxList wxFileSystem::m_Handlers;
 302
 303
 304 wxFileSystem::~wxFileSystem()
 305 {
 306     WX_CLEAR_HASH_MAP(wxFSHandlerHash, m_LocalHandlers)
 307 }
 308
 309
 310 static wxString MakeCorrectPath(const wxString& path)
 311 {
 312     wxString p(path);
 313     wxString r;
 314     int i, j, cnt;
 315
 316     cnt = p.length();
 317     for (i = 0; i < cnt; i++)
 318       if (p.GetChar(i) == wxT('\\')) p.GetWritableChar(i) = wxT('/'); // Want to be windows-safe
 319
 320     if (p.Left(2) == wxT("./")) { p = p.Mid(2); cnt -= 2; }
 321
 322     if (cnt < 3) return p;
 323
 324     r << p.GetChar(0) << p.GetChar(1);
 325
 326     // skip trailing ../.., if any
 327     for (i = 2; i < cnt && (p.GetChar(i) == wxT('/') || p.GetChar(i) == wxT('.')); i++) r << p.GetChar(i);
 328
 329     // remove back references: translate dir1/../dir2 to dir2
 330     for (; i < cnt; i++)
 331     {
 332         r << p.GetChar(i);
 333         if (p.GetChar(i) == wxT('/') && p.GetChar(i-1) == wxT('.') && p.GetChar(i-2) == wxT('.'))
 334         {
 335             for (j = r.length() - 2; j >= 0 && r.GetChar(j) != wxT('/') && r.GetChar(j) != wxT(':'); j--) {}
 336             if (j >= 0 && r.GetChar(j) != wxT(':'))
 337             {
 338                 for (j = j - 1; j >= 0 && r.GetChar(j) != wxT('/') && r.GetChar(j) != wxT(':'); j--) {}
 339                 r.Remove(j + 1);
 340             }
 341         }
 342     }
 343
 344     for (; i < cnt; i++) r << p.GetChar(i);
 345
 346     return r;
 347 }
 348
 349
 350 void wxFileSystem::ChangePathTo(const wxString& location, bool is_dir)
 351 {
 352     int i, pathpos = -1;
 353
 354     m_Path = MakeCorrectPath(location);
 355
 356     if (is_dir)
 357     {
 358         if (!m_Path.empty() && m_Path.Last() != wxT('/') && m_Path.Last() != wxT(':'))
 359             m_Path << wxT('/');
 360     }
 361
 362     else
 363     {
 364         for (i = m_Path.length()-1; i >= 0; i--)
 365         {
 366             if (m_Path[(unsigned int) i] == wxT('/'))
 367             {
 368                 if ((i > 1) && (m_Path[(unsigned int) (i-1)] == wxT('/')) && (m_Path[(unsigned int) (i-2)] == wxT(':')))
 369                 {
 370                     i -= 2;
 371                     continue;
 372                 }
 373                 else
 374                 {
 375                     pathpos = i;
 376                     break;
 377                 }
 378             }
 379             else if (m_Path[(unsigned int) i] == wxT(':')) {
 380                 pathpos = i;
 381                 break;
 382             }
 383         }
 384         if (pathpos == -1)
 385         {
 386             for (i = 0; i < (int) m_Path.length(); i++)
 387             {
 388                 if (m_Path[(unsigned int) i] == wxT(':'))
 389                 {
 390                     m_Path.Remove(i+1);
 391                     break;
 392                 }
 393             }
 394             if (i == (int) m_Path.length())
 395                 m_Path = wxEmptyString;
 396         }
 397         else
 398         {
 399             m_Path.Remove(pathpos+1);
 400         }
 401     }
 402 }
 403
 404
 405
 406 wxFileSystemHandler *wxFileSystem::MakeLocal(wxFileSystemHandler *h)
 407 {
 408     wxClassInfo *classinfo = h->GetClassInfo();
 409
 410     if (classinfo->IsDynamic())
 411     {
 412         wxFileSystemHandler*& local = m_LocalHandlers[classinfo];
 413         if (!local)
 414             local = (wxFileSystemHandler*)classinfo->CreateObject();
 415         return local;
 416     }
 417     else
 418     {
 419         return h;
 420     }
 421 }
 422
 423
 424
 425 wxFSFile* wxFileSystem::OpenFile(const wxString& location, int flags)
 426 {
 427     if ((flags & wxFS_READ) == 0)
 428         return NULL;
 429
 430     wxString loc = MakeCorrectPath(location);
 431     unsigned i, ln;
 432     wxChar meta;
 433     wxFSFile *s = NULL;
 434     wxList::compatibility_iterator node;
 435
 436     ln = loc.length();
 437     meta = 0;
 438     for (i = 0; i < ln; i++)
 439     {
 440         switch ( loc[i].GetValue() )
 441         {
 442             case wxT('/') : case wxT(':') : case wxT('#') :
 443                 meta = loc[i];
 444                 break;
 445         }
 446         if (meta != 0) break;
 447     }
 448     m_LastName = wxEmptyString;
 449
 450     // try relative paths first :
 451     if (meta != wxT(':'))
 452     {
 453         node = m_Handlers.GetFirst();
 454         while (node)
 455         {
 456             wxFileSystemHandler *h = (wxFileSystemHandler*) node -> GetData();
 457             if (h->CanOpen(m_Path + loc))
 458             {
 459                 s = MakeLocal(h)->OpenFile(*this, m_Path + loc);
 460                 if (s) { m_LastName = m_Path + loc; break; }
 461             }
 462             node = node->GetNext();
 463         }
 464     }
 465
 466     // if failed, try absolute paths :
 467     if (s == NULL)
 468     {
 469         node = m_Handlers.GetFirst();
 470         while (node)
 471         {
 472             wxFileSystemHandler *h = (wxFileSystemHandler*) node->GetData();
 473             if (h->CanOpen(loc))
 474             {
 475                 s = MakeLocal(h)->OpenFile(*this, loc);
 476                 if (s) { m_LastName = loc; break; }
 477             }
 478             node = node->GetNext();
 479         }
 480     }
 481
 482     if (s && (flags & wxFS_SEEKABLE) != 0 && !s->GetStream()->IsSeekable())
 483     {
 484         wxBackedInputStream *stream;
 485         stream = new wxBackedInputStream(s->DetachStream());
 486         stream->FindLength();
 487         s->SetStream(stream);
 488     }
 489
 490     return (s);
 491 }
 492
 493
 494
 495 wxString wxFileSystem::FindFirst(const wxString& spec, int flags)
 496 {
 497     wxList::compatibility_iterator node;
 498     wxString spec2(spec);
 499
 500     m_FindFileHandler = NULL;
 501
 502     for (int i = spec2.length()-1; i >= 0; i--)
 503         if (spec2[(unsigned int) i] == wxT('\\')) spec2.GetWritableChar(i) = wxT('/'); // Want to be windows-safe
 504
 505     node = m_Handlers.GetFirst();
 506     while (node)
 507     {
 508         wxFileSystemHandler *h = (wxFileSystemHandler*) node -> GetData();
 509         if (h -> CanOpen(m_Path + spec2))
 510         {
 511             m_FindFileHandler = MakeLocal(h);
 512             return m_FindFileHandler -> FindFirst(m_Path + spec2, flags);
 513         }
 514         node = node->GetNext();
 515     }
 516
 517     node = m_Handlers.GetFirst();
 518     while (node)
 519     {
 520         wxFileSystemHandler *h = (wxFileSystemHandler*) node -> GetData();
 521         if (h -> CanOpen(spec2))
 522         {
 523             m_FindFileHandler = MakeLocal(h);
 524             return m_FindFileHandler -> FindFirst(spec2, flags);
 525         }
 526         node = node->GetNext();
 527     }
 528
 529     return wxEmptyString;
 530 }
 531
 532
 533
 534 wxString wxFileSystem::FindNext()
 535 {
 536     if (m_FindFileHandler == NULL) return wxEmptyString;
 537     else return m_FindFileHandler -> FindNext();
 538 }
 539
 540 bool wxFileSystem::FindFileInPath(wxString *pStr,
 541                                   const wxString& path,
 542                                   const wxString& basename)
 543 {
 544     // we assume that it's not empty
 545     wxCHECK_MSG( !basename.empty(), false,
 546                 wxT("empty file name in wxFileSystem::FindFileInPath"));
 547
 548     wxString name;
 549     // skip path separator in the beginning of the file name if present
 550     if ( wxIsPathSeparator(basename[0u]) )
 551         name = basename.substr(1);
 552     else
 553         name = basename;
 554
 555     wxStringTokenizer tokenizer(path, wxPATH_SEP);
 556     while ( tokenizer.HasMoreTokens() )
 557     {
 558         wxString strFile = tokenizer.GetNextToken();
 559         if ( !wxEndsWithPathSeparator(strFile) )
 560             strFile += wxFILE_SEP_PATH;
 561         strFile += name;
 562
 563         wxFSFile *file = OpenFile(strFile);
 564         if ( file )
 565         {
 566             delete file;
 567             *pStr = strFile;
 568             return true;
 569         }
 570     }
 571
 572     return false;
 573 }
 574
 575 void wxFileSystem::AddHandler(wxFileSystemHandler *handler)
 576 {
 577     // prepend the handler to the beginning of the list because handlers added
 578     // last should have the highest priority to allow overriding them
 579     m_Handlers.Insert((size_t)0, handler);
 580 }
 581
 582 wxFileSystemHandler* wxFileSystem::RemoveHandler(wxFileSystemHandler *handler)
 583 {
 584     // if handler has already been removed (or deleted)
 585     // we return NULL. This is by design in case
 586     // CleanUpHandlers() is called before RemoveHandler
 587     // is called, as we cannot control the order
 588     // which modules are unloaded
 589     if (!m_Handlers.DeleteObject(handler))
 590         return NULL;
 591
 592     return handler;
 593 }
 594
 595
 596 bool wxFileSystem::HasHandlerForPath(const wxString &location)
 597 {
 598     for ( wxList::compatibility_iterator node = m_Handlers.GetFirst();
 599            node; node = node->GetNext() )
 600     {
 601         wxFileSystemHandler *h = (wxFileSystemHandler*) node->GetData();
 602         if (h->CanOpen(location))
 603             return true;
 604     }
 605
 606     return false;
 607 }
 608
 609 void wxFileSystem::CleanUpHandlers()
 610 {
 611     WX_CLEAR_LIST(wxList, m_Handlers);
 612 }
 613
 614 static const wxString g_unixPathString(wxT("/"));
 615 static const wxString g_nativePathString(wxFILE_SEP_PATH);
 616
 617 // Returns the native path for a file URL
 618 wxFileName wxFileSystem::URLToFileName(const wxString& url)
 619 {
 620     wxString path = url;
 621
 622     if ( path.Find(wxT("file://")) == 0 )
 623     {
 624         path = path.Mid(7);
 625     }
 626     else if ( path.Find(wxT("file:")) == 0 )
 627     {
 628         path = path.Mid(5);
 629     }
 630     // Remove preceding double slash on Mac Classic
 631 #if defined(__WXMAC__) && !defined(__UNIX__)
 632     else if ( path.Find(wxT("//")) == 0 )
 633         path = path.Mid(2);
 634 #endif
 635
 636     path = wxURI::Unescape(path);
 637
 638 #ifdef __WINDOWS__
 639     // file urls either start with a forward slash (local harddisk),
 640     // otherwise they have a servername/sharename notation,
 641     // which only exists on msw and corresponds to a unc
 642     if ( path.length() > 1 && (path[0u] == wxT('/') && path [1u] != wxT('/')) )
 643     {
 644         path = path.Mid(1);
 645     }
 646     else if ( (url.Find(wxT("file://")) == 0) &&
 647               (path.Find(wxT('/')) != wxNOT_FOUND) &&
 648               (path.length() > 1) && (path[1u] != wxT(':')) )
 649     {
 650         path = wxT("//") + path;
 651     }
 652 #endif
 653
 654     path.Replace(g_unixPathString, g_nativePathString);
 655
 656     return wxFileName(path, wxPATH_NATIVE);
 657 }
 658
 659 // Escapes non-ASCII and others characters in file: URL to be valid URLs
 660 static wxString EscapeFileNameCharsInURL(const char *in)
 661 {
 662     wxString s;
 663
 664     for ( const unsigned char *p = (const unsigned char*)in; *p; ++p )
 665     {
 666         const unsigned char c = *p;
 667
 668         // notice that all colons *must* be encoded in the paths used by
 669         // wxFileSystem even though this makes URLs produced by this method
 670         // unusable with IE under Windows as it requires "file:///c:/foo.bar"
 671         // and doesn't accept "file:///c%3a/foo.bar" -- but then we never made
 672         // any guarantees about general suitability of the strings returned by
 673         // this method, they must work with wxFileSystem only and not encoding
 674         // the colon breaks handling of
 675         // "http://wherever/whatever.zip#zip:filename.ext" URLs so we really
 676         // can't do this without heavy changes to the parsing code here, in
 677         // particular in GetRightLocation()
 678
 679         if ( c == '/' || c == '-' || c == '.' || c == '_' || c == '~' ||
 680              (c >= '0' && c <= '9') ||
 681              (c >= 'a' && c <= 'z') ||
 682              (c >= 'A' && c <= 'Z') )
 683         {
 684             s << c;
 685         }
 686         else
 687         {
 688             s << wxString::Format("%%%02x", c);
 689         }
 690     }
 691
 692     return s;
 693 }
 694
 695 // Returns the file URL for a native path
 696 wxString wxFileSystem::FileNameToURL(const wxFileName& filename)
 697 {
 698     wxFileName fn = filename;
 699     fn.Normalize(wxPATH_NORM_DOTS | wxPATH_NORM_TILDE | wxPATH_NORM_ABSOLUTE);
 700     wxString url = fn.GetFullPath(wxPATH_NATIVE);
 701
 702 #ifndef __UNIX__
 703     // unc notation, wxMSW
 704     if ( url.Find(wxT("\\\\")) == 0 )
 705     {
 706         url = wxT("//") + url.Mid(2);
 707     }
 708     else
 709     {
 710         url = wxT("/") + url;
 711 #ifdef __WXMAC__
 712         url = wxT("/") + url;
 713 #endif
 714
 715     }
 716 #endif
 717
 718     url.Replace(g_nativePathString, g_unixPathString);
 719
 720     // Do wxURI- and common practice-compatible escaping: encode the string
 721     // into UTF-8, then escape anything non-ASCII:
 722     return wxT("file:") + EscapeFileNameCharsInURL(url.utf8_str());
 723 }
 724
 725
 726 ///// Module:
 727
 728 class wxFileSystemModule : public wxModule
 729 {
 730     DECLARE_DYNAMIC_CLASS(wxFileSystemModule)
 731
 732     public:
 733         wxFileSystemModule() :
 734             wxModule(),
 735             m_handler(NULL)
 736         {
 737         }
 738
 739         virtual bool OnInit()
 740         {
 741             m_handler = new wxLocalFSHandler;
 742             wxFileSystem::AddHandler(m_handler);
 743             return true;
 744         }
 745         virtual void OnExit()
 746         {
 747             delete wxFileSystem::RemoveHandler(m_handler);
 748
 749             wxFileSystem::CleanUpHandlers();
 750         }
 751
 752     private:
 753         wxFileSystemHandler* m_handler;
 754
 755 };
 756
 757 IMPLEMENT_DYNAMIC_CLASS(wxFileSystemModule, wxModule)
 758
 759 //// wxFSInputStream
 760
 761 wxFSInputStream::wxFSInputStream(const wxString& filename, int flags)
 762 {
 763     wxFileSystem fs;
 764     m_file = fs.OpenFile(filename, flags | wxFS_READ);
 765
 766     if ( m_file )
 767     {
 768         wxInputStream* const stream = m_file->GetStream();
 769         if ( stream )
 770         {
 771             // Notice that we pass the stream by reference: it shouldn't be
 772             // deleted by us as it's owned by m_file already.
 773             InitParentStream(*stream);
 774         }
 775     }
 776 }
 777
 778 wxFSInputStream::~wxFSInputStream()
 779 {
 780     delete m_file;
 781 }
 782
 783 #endif
 784   // wxUSE_FILESYSTEM