src/common/filesys.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifdef __GNUG__
  11 #pragma implementation
  12 #endif
  13
  14 #include "wx/wxprec.h"
  15
  16 #ifdef __BORDLANDC__
  17 #pragma hdrstop
  18 #endif
  19
  20
  21 #if wxUSE_FILESYSTEM
  22
  23 #include "wx/wfstream.h"
  24 #include "wx/module.h"
  25 #include "wx/filesys.h"
  26 #include "wx/mimetype.h"
  27 #include "wx/filename.h"
  28
  29
  30
  31 //--------------------------------------------------------------------------------
  32 // wxFileSystemHandler
  33 //--------------------------------------------------------------------------------
  34
  35 IMPLEMENT_ABSTRACT_CLASS(wxFileSystemHandler, wxObject)
  36
  37
  38 static wxFileTypeInfo *gs_FSMimeFallbacks = NULL;
  39
  40 wxString wxFileSystemHandler::GetMimeTypeFromExt(const wxString& location)
  41 {
  42     wxString ext = wxEmptyString, mime = wxEmptyString;
  43     wxString loc = GetRightLocation(location);
  44     char c;
  45     int l = loc.Length(), l2;
  46     wxFileType *ft;
  47
  48     l2 = l;
  49     for (int i = l-1; i >= 0; i--) {
  50         c = loc[(unsigned int) i];
  51         if (c == wxT('#')) l2 = i + 1;
  52         if (c == wxT('.')) {ext = loc.Right(l2-i-1); break;}
  53         if ((c == wxT('/')) || (c == wxT('\\')) || (c == wxT(':'))) {return wxEmptyString;}
  54     }
  55
  56     static bool s_MinimalMimeEnsured = FALSE;
  57     if (!s_MinimalMimeEnsured) {
  58         wxTheMimeTypesManager -> AddFallbacks(gs_FSMimeFallbacks);
  59         s_MinimalMimeEnsured = TRUE;
  60     }
  61
  62     ft = wxTheMimeTypesManager -> GetFileTypeFromExtension(ext);
  63     if ( !ft || !ft -> GetMimeType(&mime) ) {
  64         mime = wxEmptyString;
  65     }
  66
  67     delete ft;
  68
  69     return mime;
  70 }
  71
  72
  73
  74 wxString wxFileSystemHandler::GetProtocol(const wxString& location) const
  75 {
  76     wxString s = wxEmptyString;
  77     int i, l = location.Length();
  78     bool fnd;
  79
  80     fnd = FALSE;
  81     for (i = l-1; (i >= 0) && ((location[i] != wxT('#')) || (!fnd)); i--) {
  82         if ((location[i] == wxT(':')) && (i != 1 /*win: C:\path*/)) fnd = TRUE;
  83     }
  84     if (!fnd) return wxT("file");
  85     for (++i; (i < l) && (location[i] != wxT(':')); i++) s << location[i];
  86     return s;
  87 }
  88
  89
  90 wxString wxFileSystemHandler::GetLeftLocation(const wxString& location) const
  91 {
  92     int i;
  93     bool fnd;
  94
  95     fnd = FALSE;
  96     for (i = location.Length()-1; i >= 0; i--) {
  97         if ((location[i] == wxT(':')) && (i != 1 /*win: C:\path*/)) fnd = TRUE;
  98         else if (fnd && (location[i] == wxT('#'))) return location.Left(i);
  99     }
 100     return wxEmptyString;
 101 }
 102
 103 wxString wxFileSystemHandler::GetRightLocation(const wxString& location) const
 104 {
 105     int i, l = location.Length();
 106     int l2 = l + 1;
 107     for (i = l-1; (i >= 0) && ((location[i] != wxT(':')) || (i == 1) || (location[i-2] == wxT(':'))); i--) {if (location[i] == wxT('#')) l2 = i + 1;}
 108     if (i == 0) return wxEmptyString;
 109     else return location.Mid(i + 1, l2 - i - 2);
 110 }
 111
 112 wxString wxFileSystemHandler::GetAnchor(const wxString& location) const
 113 {
 114     char c;
 115     int l = location.Length();
 116
 117     for (int i = l-1; i >= 0; i--) {
 118         c = location[i];
 119         if (c == wxT('#')) return location.Right(l-i-1);
 120         else if ((c == wxT('.')) || (c == wxT('/')) || (c == wxT('\\')) || (c == wxT(':'))) return wxEmptyString;
 121     }
 122     return wxEmptyString;
 123 }
 124
 125
 126 wxString wxFileSystemHandler::FindFirst(const wxString& WXUNUSED(spec),
 127                                         int WXUNUSED(flags))
 128 {
 129     return wxEmptyString;
 130 }
 131
 132 wxString wxFileSystemHandler::FindNext()
 133 {
 134     return wxEmptyString;
 135 }
 136
 137 //--------------------------------------------------------------------------------
 138 // wxLocalFSHandler
 139 //--------------------------------------------------------------------------------
 140
 141
 142 wxString wxLocalFSHandler::ms_root;
 143
 144 bool wxLocalFSHandler::CanOpen(const wxString& location)
 145 {
 146     return GetProtocol(location) == wxT("file");
 147 }
 148
 149 wxFSFile* wxLocalFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
 150 {
 151     // location has Unix path separators
 152     wxString right = ms_root + GetRightLocation(location);
 153     wxFileName fn(right, wxPATH_UNIX);
 154
 155     if (!wxFileExists(fn.GetFullPath()))
 156         return (wxFSFile*) NULL;
 157
 158     return new wxFSFile(new wxFileInputStream(fn.GetFullPath()),
 159                         right,
 160                         GetMimeTypeFromExt(location),
 161                         GetAnchor(location),
 162                         wxDateTime(wxFileModificationTime(fn.GetFullPath())));
 163
 164 }
 165
 166 wxString wxLocalFSHandler::FindFirst(const wxString& spec, int flags)
 167 {
 168     wxString right = ms_root + GetRightLocation(spec);
 169     return wxFindFirstFile(right, flags);
 170 }
 171
 172 wxString wxLocalFSHandler::FindNext()
 173 {
 174     return wxFindNextFile();
 175 }
 176
 177
 178
 179 //-----------------------------------------------------------------------------
 180 // wxFileSystem
 181 //-----------------------------------------------------------------------------
 182
 183 IMPLEMENT_DYNAMIC_CLASS(wxFileSystem, wxObject)
 184
 185
 186 wxList wxFileSystem::m_Handlers;
 187
 188
 189 static wxString MakeCorrectPath(const wxString& path)
 190 {
 191     wxString p(path);
 192     wxString r;
 193     int i, j, cnt;
 194
 195     cnt = p.Length();
 196     for (i = 0; i < cnt; i++)
 197       if (p.GetChar(i) == wxT('\\')) p.GetWritableChar(i) = wxT('/'); // Want to be windows-safe
 198
 199     if (p.Left(2) == wxT("./")) { p = p.Mid(2); cnt -= 2; }
 200
 201     if (cnt < 3) return p;
 202
 203     r << p.GetChar(0) << p.GetChar(1);
 204
 205     // skip trailing ../.., if any
 206     for (i = 2; i < cnt && (p.GetChar(i) == wxT('/') || p.GetChar(i) == wxT('.')); i++) r << p.GetChar(i);
 207
 208     // remove back references: translate dir1/../dir2 to dir2
 209     for (; i < cnt; i++)
 210     {
 211         r << p.GetChar(i);
 212         if (p.GetChar(i) == wxT('/') && p.GetChar(i-1) == wxT('.') && p.GetChar(i-2) == wxT('.'))
 213         {
 214             for (j = r.Length() - 2; j >= 0 && r.GetChar(j) != wxT('/') && r.GetChar(j) != wxT(':'); j--) {}
 215             if (j >= 0 && r.GetChar(j) != wxT(':'))
 216             {
 217                 for (j = j - 1; j >= 0 && r.GetChar(j) != wxT('/') && r.GetChar(j) != wxT(':'); j--) {}
 218                 r.Remove(j + 1);
 219             }
 220         }
 221     }
 222
 223     for (; i < cnt; i++) r << p.GetChar(i);
 224
 225     return r;
 226 }
 227
 228
 229 void wxFileSystem::ChangePathTo(const wxString& location, bool is_dir)
 230 {
 231     int i, pathpos = -1;
 232
 233     m_Path = MakeCorrectPath(location);
 234
 235     if (is_dir)
 236     {
 237         if (m_Path.Length() > 0 && m_Path.Last() != wxT('/') && m_Path.Last() != wxT(':'))
 238                 m_Path << wxT('/');
 239     }
 240
 241     else
 242     {
 243         for (i = m_Path.Length()-1; i >= 0; i--)
 244         {
 245             if (m_Path[(unsigned int) i] == wxT('/'))
 246                 {
 247                 if ((i > 1) && (m_Path[(unsigned int) (i-1)] == wxT('/')) && (m_Path[(unsigned int) (i-2)] == wxT(':')))
 248                         {
 249                     i -= 2;
 250                     continue;
 251                 }
 252                 else
 253                         {
 254                     pathpos = i;
 255                     break;
 256                 }
 257             }
 258             else if (m_Path[(unsigned int) i] == wxT(':')) {
 259                 pathpos = i;
 260                 break;
 261             }
 262         }
 263         if (pathpos == -1)
 264         {
 265             for (i = 0; i < (int) m_Path.Length(); i++)
 266             {
 267                 if (m_Path[(unsigned int) i] == wxT(':'))
 268                         {
 269                     m_Path.Remove(i+1);
 270                     break;
 271                 }
 272             }
 273             if (i == (int) m_Path.Length())
 274                 m_Path = wxEmptyString;
 275         }
 276         else
 277         {
 278             m_Path.Remove(pathpos+1);
 279         }
 280     }
 281 }
 282
 283
 284
 285 wxFSFile* wxFileSystem::OpenFile(const wxString& location)
 286 {
 287     wxString loc = MakeCorrectPath(location);
 288     unsigned i, ln;
 289     char meta;
 290     wxFSFile *s = NULL;
 291     wxNode *node;
 292
 293     ln = loc.Length();
 294     meta = 0;
 295     for (i = 0; i < ln; i++)
 296     {
 297         switch (loc[i])
 298         {
 299             case wxT('/') : case wxT(':') : case wxT('#') :
 300                 meta = loc[i];
 301                 break;
 302         }
 303         if (meta != 0) break;
 304     }
 305     m_LastName = wxEmptyString;
 306
 307     // try relative paths first :
 308     if (meta != wxT(':'))
 309     {
 310         node = m_Handlers.GetFirst();
 311         while (node)
 312         {
 313             wxFileSystemHandler *h = (wxFileSystemHandler*) node -> GetData();
 314             if (h->CanOpen(m_Path + loc))
 315                 {
 316                 s = h->OpenFile(*this, m_Path + loc);
 317                 if (s) { m_LastName = m_Path + loc; break; }
 318             }
 319             node = node->GetNext();
 320         }
 321     }
 322
 323     // if failed, try absolute paths :
 324     if (s == NULL)
 325     {
 326         node = m_Handlers.GetFirst();
 327         while (node)
 328         {
 329             wxFileSystemHandler *h = (wxFileSystemHandler*) node->GetData();
 330             if (h->CanOpen(loc))
 331             {
 332                 s = h->OpenFile(*this, loc);
 333                 if (s) { m_LastName = loc; break; }
 334             }
 335             node = node->GetNext();
 336         }
 337     }
 338     return (s);
 339 }
 340
 341
 342
 343 wxString wxFileSystem::FindFirst(const wxString& spec, int flags)
 344 {
 345     wxNode *node;
 346     wxString spec2(spec);
 347
 348     m_FindFileHandler = NULL;
 349
 350     for (int i = spec2.Length()-1; i >= 0; i--)
 351         if (spec2[(unsigned int) i] == wxT('\\')) spec2.GetWritableChar(i) = wxT('/'); // Want to be windows-safe
 352
 353     node = m_Handlers.GetFirst();
 354     while (node)
 355     {
 356         m_FindFileHandler = (wxFileSystemHandler*) node -> GetData();
 357         if (m_FindFileHandler -> CanOpen(m_Path + spec2))
 358             return m_FindFileHandler -> FindFirst(m_Path + spec2, flags);
 359         node = node->GetNext();
 360     }
 361
 362     node = m_Handlers.GetFirst();
 363     while (node)
 364     {
 365         m_FindFileHandler = (wxFileSystemHandler*) node -> GetData();
 366         if (m_FindFileHandler -> CanOpen(spec2))
 367             return m_FindFileHandler -> FindFirst(spec2, flags);
 368         node = node->GetNext();
 369     }
 370
 371     return wxEmptyString;
 372 }
 373
 374
 375
 376 wxString wxFileSystem::FindNext()
 377 {
 378     if (m_FindFileHandler == NULL) return wxEmptyString;
 379     else return m_FindFileHandler -> FindNext();
 380 }
 381
 382
 383
 384 void wxFileSystem::AddHandler(wxFileSystemHandler *handler)
 385 {
 386     m_Handlers.Append(handler);
 387 }
 388
 389
 390 void wxFileSystem::CleanUpHandlers()
 391 {
 392     m_Handlers.DeleteContents(TRUE);
 393     m_Handlers.Clear();
 394 }
 395
 396
 397
 398
 399 ///// Module:
 400
 401 class wxFileSystemModule : public wxModule
 402 {
 403     DECLARE_DYNAMIC_CLASS(wxFileSystemModule)
 404
 405     public:
 406         virtual bool OnInit()
 407         {
 408             wxFileSystem::AddHandler(new wxLocalFSHandler);
 409
 410             gs_FSMimeFallbacks = new wxFileTypeInfo[6];
 411             gs_FSMimeFallbacks[0] =
 412             wxFileTypeInfo("image/jpeg",
 413                            "",
 414                            "",
 415                            "JPEG image (from fallback)",
 416                            "jpg", "jpeg", NULL);
 417             gs_FSMimeFallbacks[1] =
 418             wxFileTypeInfo("image/gif",
 419                            "",
 420                            "",
 421                            "GIF image (from fallback)",
 422                            "gif", NULL);
 423             gs_FSMimeFallbacks[2] =
 424             wxFileTypeInfo("image/png",
 425                            "",
 426                            "",
 427                            "PNG image (from fallback)",
 428                            "png", NULL);
 429             gs_FSMimeFallbacks[3] =
 430             wxFileTypeInfo("image/bmp",
 431                            "",
 432                            "",
 433                            "windows bitmap image (from fallback)",
 434                            "bmp", NULL);
 435             gs_FSMimeFallbacks[4] =
 436             wxFileTypeInfo("text/html",
 437                            "",
 438                            "",
 439                            "HTML document (from fallback)",
 440                            "htm", "html", NULL);
 441             gs_FSMimeFallbacks[5] =
 442             // must terminate the table with this!
 443             wxFileTypeInfo();
 444
 445             return TRUE;
 446         }
 447         virtual void OnExit()
 448         {
 449             delete [] gs_FSMimeFallbacks;
 450             wxFileSystem::CleanUpHandlers();
 451         }
 452 };
 453
 454 IMPLEMENT_DYNAMIC_CLASS(wxFileSystemModule, wxModule)
 455
 456 #endif
 457   // wxUSE_FILESYSTEM
 458
 459
 460