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 // Licence:     wxWindows Licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 #ifdef __GNUG__
  10 #pragma implementation
  11 #endif
  12
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORDLANDC__
  16 #pragma hdrstop
  17 #endif
  18
  19 #if !wxUSE_SOCKETS
  20     #undef wxUSE_FS_INET
  21     #define wxUSE_FS_INET 0
  22 #endif
  23
  24 #if (wxUSE_FS_INET || wxUSE_FS_ZIP) && wxUSE_STREAMS
  25
  26 #include "wx/wfstream.h"
  27 #include "wx/module.h"
  28 #include "wx/filesys.h"
  29
  30 //--------------------------------------------------------------------------------
  31 // wxFileSystemHandler
  32 //--------------------------------------------------------------------------------
  33
  34 IMPLEMENT_ABSTRACT_CLASS(wxFileSystemHandler, wxObject)
  35
  36 wxMimeTypesManager *wxFileSystemHandler::m_MimeMng = NULL;
  37
  38 void wxFileSystemHandler::CleanUpStatics()
  39 {
  40     if (m_MimeMng) delete m_MimeMng;
  41     m_MimeMng = NULL;
  42 }
  43
  44
  45 wxString wxFileSystemHandler::GetMimeTypeFromExt(const wxString& location)
  46 {
  47     wxString ext = wxEmptyString, mime = wxEmptyString;
  48     wxString loc = GetRightLocation(location);
  49     char c;
  50     int l = loc.Length(), l2;
  51     wxFileType *ft;
  52
  53     l2 = l;
  54     for (int i = l-1; i >= 0; i--) {
  55         c = loc[(unsigned int) i];
  56         if (c == _T('#')) l2 = i + 1;
  57         if (c == _T('.')) {ext = loc.Right(l2-i-1); break;}
  58         if ((c == _T('/')) || (c == _T('\\')) || (c == _T(':'))) {return wxEmptyString;}
  59     }
  60
  61     if (m_MimeMng == NULL) {
  62         m_MimeMng = new wxMimeTypesManager;
  63
  64         static const wxFileTypeInfo fallbacks[] =
  65         {
  66             wxFileTypeInfo("image/jpeg",
  67                            "",
  68                            "",
  69                            "JPEG image (from fallback)",
  70                            "jpg", "jpeg", NULL),
  71             wxFileTypeInfo("image/gif",
  72                            "",
  73                            "",
  74                            "GIF image (from fallback)",
  75                            "gif", NULL),
  76             wxFileTypeInfo("image/png",
  77                            "",
  78                            "",
  79                            "PNG image (from fallback)",
  80                            "png", NULL),
  81             wxFileTypeInfo("image/bmp",
  82                            "",
  83                            "",
  84                            "windows bitmap image (from fallback)",
  85                            "bmp", NULL),
  86             wxFileTypeInfo("text/html",
  87                            "",
  88                            "",
  89                            "HTML document (from fallback)",
  90                            "htm", "html", NULL),
  91
  92             // must terminate the table with this!
  93             wxFileTypeInfo()
  94         };
  95
  96         m_MimeMng -> AddFallbacks(fallbacks);
  97     }
  98
  99     ft = m_MimeMng -> GetFileTypeFromExtension(ext);
 100     if (ft && (ft -> GetMimeType(&mime))) return mime;
 101     else return wxEmptyString;
 102 }
 103
 104
 105
 106 wxString wxFileSystemHandler::GetProtocol(const wxString& location) const
 107 {
 108     wxString s = wxEmptyString;
 109     int i, l = location.Length();
 110     bool fnd;
 111
 112     fnd = FALSE;
 113     for (i = l-1; (i >= 0) && ((location[i] != _T('#')) || (!fnd)); i--) {
 114         if ((location[i] == _T(':')) && (i != 1 /*win: C:\path*/)) fnd = TRUE;
 115     }
 116     if (!fnd) return _T("file");
 117     for (++i; (i < l) && (location[i] != _T(':')); i++) s << location[i];
 118     return s;
 119 }
 120
 121
 122 wxString wxFileSystemHandler::GetLeftLocation(const wxString& location) const
 123 {
 124     int i;
 125     bool fnd;
 126
 127     fnd = FALSE;
 128     for (i = location.Length()-1; i >= 0; i--) {
 129         if ((location[i] == _T(':')) && (i != 1 /*win: C:\path*/)) fnd = TRUE;
 130         else if (fnd && (location[i] == _T('#'))) return location.Left(i);
 131     }
 132     return wxEmptyString;
 133 }
 134
 135 wxString wxFileSystemHandler::GetRightLocation(const wxString& location) const
 136 {
 137     int i, l = location.Length();
 138     int l2 = l + 1;
 139     for (i = l-1; (i >= 0) && ((location[i] != _T(':')) || (i == 1) || (location[i-2] == _T(':'))); i--) {if (location[i] == _T('#')) l2 = i + 1;}
 140     if (i == 0) return wxEmptyString;
 141     else return location.Mid(i + 1, l2 - i - 2);
 142 }
 143
 144 wxString wxFileSystemHandler::GetAnchor(const wxString& location) const
 145 {
 146     char c;
 147     int l = location.Length();
 148
 149     for (int i = l-1; i >= 0; i--) {
 150         c = location[i];
 151         if (c == _T('#')) return location.Right(l-i-1);
 152         else if ((c == _T('.')) || (c == _T('/')) || (c == _T('\\')) || (c == _T(':'))) return wxEmptyString;
 153     }
 154     return wxEmptyString;
 155 }
 156
 157 //--------------------------------------------------------------------------------
 158 // wxLocalFSHandler
 159 //--------------------------------------------------------------------------------
 160
 161 class wxLocalFSHandler : public wxFileSystemHandler
 162 {
 163     public:
 164         virtual bool CanOpen(const wxString& location);
 165         virtual wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location);
 166 };
 167
 168
 169 bool wxLocalFSHandler::CanOpen(const wxString& location)
 170 {
 171     return GetProtocol(location) == _T("file");
 172 }
 173
 174 wxFSFile* wxLocalFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
 175 {
 176     wxString right = GetRightLocation(location);
 177     if (wxFileExists(right))
 178         return new wxFSFile(new wxFileInputStream(right),
 179                             right,
 180                             GetMimeTypeFromExt(location),
 181                             GetAnchor(location));
 182     else return (wxFSFile*) NULL;
 183 }
 184
 185 //-----------------------------------------------------------------------------
 186 // wxFileSystem
 187 //-----------------------------------------------------------------------------
 188
 189 IMPLEMENT_DYNAMIC_CLASS(wxFileSystem, wxObject)
 190
 191
 192 wxList wxFileSystem::m_Handlers;
 193
 194
 195
 196 void wxFileSystem::ChangePathTo(const wxString& location, bool is_dir)
 197 {
 198     int i, pathpos = -1;
 199     m_Path = location;
 200
 201     for (i = m_Path.Length()-1; i >= 0; i--)
 202         if (m_Path[(unsigned int) i] == _T('\\')) m_Path.GetWritableChar(i) = _T('/');         // wanna be windows-safe
 203
 204     if (is_dir == FALSE)
 205     {
 206         for (i = m_Path.Length()-1; i >= 0; i--)
 207         {
 208             if (m_Path[(unsigned int) i] == _T('/'))
 209             {
 210                 if ((i > 1) && (m_Path[(unsigned int) (i-1)] == _T('/')) && (m_Path[(unsigned int) (i-2)] == _T(':')))
 211                 {
 212                     i -= 2;
 213                     continue;
 214                 }
 215                 else
 216                 {
 217                     pathpos = i;
 218                     break;
 219                 }
 220             }
 221         else if (m_Path[(unsigned int) i] == _T(':')) {
 222             pathpos = i;
 223         break;
 224         }
 225     }
 226         if (pathpos == -1)
 227         {
 228             for (i = 0; i < (int) m_Path.Length(); i++)
 229             {
 230                 if (m_Path[(unsigned int) i] == _T(':'))
 231                 {
 232                     //m_Path << _T('/');
 233                     m_Path.Remove(i+1);
 234                     break;
 235                 }
 236             }
 237             if (i == (int) m_Path.Length())
 238                 m_Path = wxEmptyString;
 239         }
 240         else
 241         {
 242             if (m_Path[m_Path.Length()-1] != _T('/'))
 243                 m_Path << _T('/');
 244             m_Path.Remove(pathpos+1);
 245         }
 246     }
 247 }
 248
 249
 250
 251 wxFSFile* wxFileSystem::OpenFile(const wxString& location)
 252 {
 253     wxString loc = location;
 254     int i, ln;
 255     char meta;
 256     wxFSFile *s = NULL;
 257     wxNode *node;
 258
 259     ln = loc.Length();
 260     meta = 0;
 261     for (i = 0; i < ln; i++)
 262     {
 263         if (loc[(unsigned int) i] == _T('\\')) loc.GetWritableChar(i) = _T('/');         // wanna be windows-safe
 264         if (!meta) switch (loc[(unsigned int) i])
 265         {
 266             case _T('/') : case _T(':') : case _T('#') : meta = loc[(unsigned int) i];
 267         }
 268     }
 269     m_LastName = wxEmptyString;
 270
 271     // try relative paths first :
 272     if (meta != _T(':'))
 273     {
 274         node = m_Handlers.GetFirst();
 275         while (node)
 276         {
 277             wxFileSystemHandler *h = (wxFileSystemHandler*) node -> GetData();
 278             if (h->CanOpen(m_Path + location))
 279             {
 280                 s = h->OpenFile(*this, m_Path + location);
 281                 if (s) { m_LastName = m_Path + location; break; }
 282             }
 283             node = node->GetNext();
 284         }
 285     }
 286
 287     // if failed, try absolute paths :
 288     if (s == NULL)
 289     {
 290         node = m_Handlers.GetFirst();
 291         while (node)
 292         {
 293             wxFileSystemHandler *h = (wxFileSystemHandler*) node->GetData();
 294             if (h->CanOpen(location))
 295             {
 296                 s = h->OpenFile(*this, location);
 297                 if (s) { m_LastName = location; break; }
 298             }
 299             node = node->GetNext();
 300         }
 301     }
 302     return (s);
 303 }
 304
 305
 306 void wxFileSystem::AddHandler(wxFileSystemHandler *handler)
 307 {
 308     m_Handlers.Append(handler);
 309 }
 310
 311
 312
 313 ///// Module:
 314
 315 class wxFileSystemModule : public wxModule
 316 {
 317     DECLARE_DYNAMIC_CLASS(wxFileSystemModule)
 318
 319     public:
 320         virtual bool OnInit()
 321         {
 322             wxFileSystem::AddHandler(new wxLocalFSHandler);
 323             return TRUE;
 324         }
 325         virtual void OnExit()
 326         {
 327             wxFileSystemHandler::CleanUpStatics();
 328         }
 329 };
 330
 331 IMPLEMENT_DYNAMIC_CLASS(wxFileSystemModule, wxModule)
 332
 333 #endif
 334   // (wxUSE_FS_INET || wxUSE_FS_ZIP) && wxUSE_STREAMS
 335
 336
 337