include/wx/filesys.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        filesys.h
   3 // Purpose:     class for opening files - virtual file system
   4 // Author:      Vaclav Slavik
   5 // Copyright:   (c) 1999 Vaclav Slavik
   6 // RCS-ID:      $Id$
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #ifndef __FILESYS_H__
  11 #define __FILESYS_H__
  12
  13 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  14 #pragma interface "filesys.h"
  15 #endif
  16
  17 #include "wx/setup.h"
  18
  19 #if !wxUSE_STREAMS
  20 #error You cannot compile virtual file systems without wxUSE_STREAMS
  21 #endif
  22
  23 #if wxUSE_HTML && !wxUSE_FILESYSTEM
  24 #error You cannot compile wxHTML without virtual file systems
  25 #endif
  26
  27 #if wxUSE_FILESYSTEM
  28
  29 #include "wx/stream.h"
  30 #include "wx/datetime.h"
  31 #include "wx/filename.h"
  32
  33 class WXDLLIMPEXP_BASE wxFSFile;
  34 class WXDLLIMPEXP_BASE wxFileSystemHandler;
  35 class WXDLLIMPEXP_BASE wxFileSystem;
  36
  37 //--------------------------------------------------------------------------------
  38 // wxFSFile
  39 //                  This class is a file opened using wxFileSystem. It consists of
  40 //                  input stream, location, mime type & optional anchor
  41 //                  (in 'index.htm#chapter2', 'chapter2' is anchor)
  42 //--------------------------------------------------------------------------------
  43
  44 class WXDLLIMPEXP_BASE wxFSFile : public wxObject
  45 {
  46 public:
  47     wxFSFile(wxInputStream *stream, const wxString& loc,
  48              const wxString& mimetype, const wxString& anchor
  49 #if wxUSE_DATETIME
  50              , wxDateTime modif
  51 #endif // wxUSE_DATETIME
  52              )
  53     {
  54         m_Stream = stream;
  55         m_Location = loc;
  56         m_MimeType = mimetype; m_MimeType.MakeLower();
  57         m_Anchor = anchor;
  58 #if wxUSE_DATETIME
  59         m_Modif = modif;
  60 #endif // wxUSE_DATETIME
  61     }
  62
  63     virtual ~wxFSFile() { if (m_Stream) delete m_Stream; }
  64
  65     // returns stream. This doesn't _create_ stream, it only returns
  66     // pointer to it.
  67     wxInputStream *GetStream() const {return m_Stream;}
  68
  69     // returns file's mime type
  70     const wxString& GetMimeType() const {return m_MimeType;}
  71
  72     // returns the original location (aka filename) of the file
  73     const wxString& GetLocation() const {return m_Location;}
  74
  75     const wxString& GetAnchor() const {return m_Anchor;}
  76
  77 #if wxUSE_DATETIME
  78     wxDateTime GetModificationTime() const {return m_Modif;}
  79 #endif // wxUSE_DATETIME
  80
  81 private:
  82     wxInputStream *m_Stream;
  83     wxString m_Location;
  84     wxString m_MimeType;
  85     wxString m_Anchor;
  86 #if wxUSE_DATETIME
  87     wxDateTime m_Modif;
  88 #endif // wxUSE_DATETIME
  89
  90     DECLARE_ABSTRACT_CLASS(wxFSFile)
  91     DECLARE_NO_COPY_CLASS(wxFSFile)
  92 };
  93
  94
  95
  96
  97
  98 //--------------------------------------------------------------------------------
  99 // wxFileSystemHandler
 100 //                  This class is FS handler for wxFileSystem. It provides
 101 //                  interface to access certain
 102 //                  kinds of files (HTPP, FTP, local, tar.gz etc..)
 103 //--------------------------------------------------------------------------------
 104
 105 class WXDLLIMPEXP_BASE wxFileSystemHandler : public wxObject
 106 {
 107 public:
 108     wxFileSystemHandler() : wxObject() {}
 109
 110     // returns true if this handler is able to open given location
 111     virtual bool CanOpen(const wxString& location) = 0;
 112
 113     // opens given file and returns pointer to input stream.
 114     // Returns NULL if opening failed.
 115     // The location is always absolute path.
 116     virtual wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location) = 0;
 117
 118     // Finds first/next file that matches spec wildcard. flags can be wxDIR for restricting
 119     // the query to directories or wxFILE for files only or 0 for either.
 120     // Returns filename or empty string if no more matching file exists
 121     virtual wxString FindFirst(const wxString& spec, int flags = 0);
 122     virtual wxString FindNext();
 123
 124 protected:
 125     // returns protocol ("file", "http", "tar" etc.) The last (most right)
 126     // protocol is used:
 127     // {it returns "tar" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 128     wxString GetProtocol(const wxString& location) const;
 129
 130     // returns left part of address:
 131     // {it returns "file:subdir/archive.tar.gz" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 132     wxString GetLeftLocation(const wxString& location) const;
 133
 134     // returns anchor part of address:
 135     // {it returns "anchor" for "file:subdir/archive.tar.gz#tar:/README.txt#anchor"}
 136     // NOTE:  anchor is NOT a part of GetLeftLocation()'s return value
 137     wxString GetAnchor(const wxString& location) const;
 138
 139     // returns right part of address:
 140     // {it returns "/README.txt" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 141     wxString GetRightLocation(const wxString& location) const;
 142
 143     // Returns MIME type of the file - w/o need to open it
 144     // (default behaviour is that it returns type based on extension)
 145     wxString GetMimeTypeFromExt(const wxString& location);
 146
 147     DECLARE_ABSTRACT_CLASS(wxFileSystemHandler)
 148 };
 149
 150
 151
 152
 153 //--------------------------------------------------------------------------------
 154 // wxFileSystem
 155 //                  This class provides simple interface for opening various
 156 //                  kinds of files (HTPP, FTP, local, tar.gz etc..)
 157 //--------------------------------------------------------------------------------
 158
 159 class WXDLLIMPEXP_BASE wxFileSystem : public wxObject
 160 {
 161 public:
 162     wxFileSystem() : wxObject() { m_FindFileHandler = NULL;}
 163     virtual ~wxFileSystem() { }
 164
 165     // sets the current location. Every call to OpenFile is
 166     // relative to this location.
 167     // NOTE !!
 168     // unless is_dir = true 'location' is *not* the directory but
 169     // file contained in this directory
 170     // (so ChangePathTo("dir/subdir/xh.htm") sets m_Path to "dir/subdir/")
 171     void ChangePathTo(const wxString& location, bool is_dir = false);
 172
 173     wxString GetPath() const {return m_Path;}
 174
 175     // opens given file and returns pointer to input stream.
 176     // Returns NULL if opening failed.
 177     // It first tries to open the file in relative scope
 178     // (based on ChangePathTo()'s value) and then as an absolute
 179     // path.
 180     wxFSFile* OpenFile(const wxString& location);
 181
 182     // Finds first/next file that matches spec wildcard. flags can be wxDIR for restricting
 183     // the query to directories or wxFILE for files only or 0 for either.
 184     // Returns filename or empty string if no more matching file exists
 185     wxString FindFirst(const wxString& spec, int flags = 0);
 186     wxString FindNext();
 187
 188     // Adds FS handler.
 189     // In fact, this class is only front-end to the FS hanlers :-)
 190     static void AddHandler(wxFileSystemHandler *handler);
 191
 192     // remove all items from the m_Handlers list
 193     static void CleanUpHandlers();
 194
 195     // Returns the native path for a file URL
 196     static wxFileName URLToFileName(const wxString& url);
 197
 198     // Returns the file URL for a native path
 199     static wxString FileNameToURL(const wxFileName& filename);
 200
 201
 202 protected:
 203     wxString m_Path;
 204             // the path (location) we are currently in
 205             // this is path, not file!
 206             // (so if you opened test/demo.htm, it is
 207             // "test/", not "test/demo.htm")
 208     wxString m_LastName;
 209             // name of last opened file (full path)
 210     static wxList m_Handlers;
 211             // list of FS handlers
 212     wxFileSystemHandler *m_FindFileHandler;
 213             // handler that succeed in FindFirst query
 214
 215     DECLARE_DYNAMIC_CLASS(wxFileSystem)
 216     DECLARE_NO_COPY_CLASS(wxFileSystem)
 217 };
 218
 219
 220 /*
 221
 222 'location' syntax:
 223
 224 To determine FS type, we're using standard KDE notation:
 225 file:/absolute/path/file.htm
 226 file:relative_path/xxxxx.html
 227 /some/path/x.file               ('file:' is default)
 228 http://www.gnome.org
 229 file:subdir/archive.tar.gz#tar:/README.txt
 230
 231 special characters :
 232   ':' - FS identificator is before this char
 233   '#' - separator. It can be either HTML anchor ("index.html#news")
 234             (in case there is no ':' in the string to the right from it)
 235         or FS separator
 236             (example : http://www.wxhtml.org/wxhtml-0.1.tar.gz#tar:/include/wxhtml/filesys.h"
 237              this would access tgz archive stored on web)
 238   '/' - directory (path) separator. It is used to determine upper-level path.
 239         HEY! Don't use \ even if you're on Windows!
 240
 241 */
 242
 243
 244 class WXDLLIMPEXP_BASE wxLocalFSHandler : public wxFileSystemHandler
 245 {
 246 public:
 247     virtual bool CanOpen(const wxString& location);
 248     virtual wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location);
 249     virtual wxString FindFirst(const wxString& spec, int flags = 0);
 250     virtual wxString FindNext();
 251
 252     // wxLocalFSHandler will prefix all filenames with 'root' before accessing
 253     // files on disk. This effectively makes 'root' the top-level directory
 254     // and prevents access to files outside this directory.
 255     // (This is similar to Unix command 'chroot'.)
 256     static void Chroot(const wxString& root) { ms_root = root; }
 257
 258 protected:
 259     static wxString ms_root;
 260 };
 261
 262
 263
 264 #endif
 265   // wxUSE_FILESYSTEM
 266
 267 #endif
 268   // __FILESYS_H__