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 #ifdef __GNUG__
  14 #pragma interface
  15 #endif
  16
  17 #include "wx/setup.h"
  18
  19 #if (wxUSE_FS_INET || wxUSE_FS_ZIP) && wxUSE_STREAMS
  20
  21 #include "wx/stream.h"
  22 #include "wx/mimetype.h"
  23 #include "wx/url.h"
  24
  25
  26 class wxFSFile;
  27 class wxFileSystemHandler;
  28 class wxFileSystem;
  29
  30 //--------------------------------------------------------------------------------
  31 // wxFSFile
  32 //                  This class is a file opened using wxFileSystem. It consists of
  33 //                  input stream, location, mime type & optional anchor
  34 //                  (in 'index.htm#chapter2', 'chapter2' is anchor)
  35 //--------------------------------------------------------------------------------
  36
  37 class WXDLLEXPORT wxFSFile : public wxObject
  38 {
  39     private:
  40         wxInputStream *m_Stream;
  41         wxString m_Location;
  42         wxString m_MimeType;
  43         wxString m_Anchor;
  44
  45     public:
  46         wxFSFile(wxInputStream *stream, const wxString& loc, const wxString& mimetype, const wxString& anchor)
  47             {
  48                 m_Stream = stream;
  49                 m_Location = loc;
  50                 m_MimeType = mimetype; m_MimeType.MakeLower();
  51                 m_Anchor = anchor;
  52             }
  53         virtual ~wxFSFile()
  54             {
  55                 if (m_Stream) delete m_Stream;
  56             }
  57
  58         wxInputStream *GetStream() const {return m_Stream;}
  59                 // returns stream. This doesn't _create_ stream, it only returns
  60                 // pointer to it!!
  61
  62         const wxString& GetMimeType() const {return m_MimeType;}
  63                 // returns file's mime type
  64
  65         const wxString& GetLocation() const {return m_Location;}
  66                 // returns the original location (aka filename) of the file
  67
  68         const wxString& GetAnchor() const {return m_Anchor;}
  69 };
  70
  71
  72
  73
  74
  75 //--------------------------------------------------------------------------------
  76 // wxFileSystemHandler
  77 //                  This class is FS handler for wxFileSystem. It provides
  78 //                  interface to access certain
  79 //                  kinds of files (HTPP, FTP, local, tar.gz etc..)
  80 //--------------------------------------------------------------------------------
  81
  82 class WXDLLEXPORT wxFileSystemHandler : public wxObject
  83 {
  84     DECLARE_ABSTRACT_CLASS(wxFileSystemHandler)
  85
  86     public:
  87         wxFileSystemHandler() : wxObject() {}
  88
  89         virtual bool CanOpen(const wxString& location) = 0;
  90                 // returns TRUE if this handler is able to open given location
  91
  92         virtual wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location) = 0;
  93                 // opens given file and returns pointer to input stream.
  94                 // Returns NULL if opening failed.
  95                 // The location is always absolute path.
  96
  97         virtual wxString FindFirst(const wxString& spec, int flags = 0);
  98         virtual wxString FindNext();
  99                 // Finds first/next file that matches spec wildcard. flags can be wxDIR for restricting
 100                 // the query to directories or wxFILE for files only or 0 for either.
 101                 // Returns filename or empty string if no more matching file exists
 102
 103     protected:
 104         wxString GetProtocol(const wxString& location) const;
 105                 // returns protocol ("file", "http", "tar" etc.) The last (most right)
 106                 // protocol is used:
 107                 // {it returns "tar" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 108
 109         wxString GetLeftLocation(const wxString& location) const;
 110                 // returns left part of address:
 111                 // {it returns "file:subdir/archive.tar.gz" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 112
 113         wxString GetAnchor(const wxString& location) const;
 114                 // returns anchor part of address:
 115                 // {it returns "anchor" for "file:subdir/archive.tar.gz#tar:/README.txt#anchor"}
 116                 // NOTE:  anchor is NOT a part of GetLeftLocation()'s return value
 117
 118         wxString GetRightLocation(const wxString& location) const;
 119                 // returns right part of address:
 120                 // {it returns "/README.txt" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 121
 122         wxString GetMimeTypeFromExt(const wxString& location);
 123                 // Returns MIME type of the file - w/o need to open it
 124                 // (default behaviour is that it returns type based on extension)
 125
 126     public:
 127         static void CleanUpStatics();
 128                 // deletes static members (m_MimeMng). It can be called
 129                 // as many times as you wish because m_MimeMng is created
 130                 // on demand
 131
 132     private:
 133         static wxMimeTypesManager *m_MimeMng;
 134                 // MIME manager
 135                 // (it's static and thus shared by all instances and derived classes)
 136 };
 137
 138
 139
 140
 141 //--------------------------------------------------------------------------------
 142 // wxFileSystem
 143 //                  This class provides simple interface for opening various
 144 //                  kinds of files (HTPP, FTP, local, tar.gz etc..)
 145 //--------------------------------------------------------------------------------
 146
 147 class WXDLLEXPORT wxFileSystem : public wxObject
 148 {
 149     DECLARE_DYNAMIC_CLASS(wxFileSystem)
 150
 151     public:
 152         wxFileSystem() : wxObject() {m_Path = m_LastName = wxEmptyString; m_Handlers.DeleteContents(TRUE); m_FindFileHandler = NULL;}
 153
 154         void ChangePathTo(const wxString& location, bool is_dir = FALSE);
 155                 // sets the current location. Every call to OpenFile is
 156                 // relative to this location.
 157                 // NOTE !!
 158                 // unless is_dir = TRUE 'location' is *not* the directory but
 159                 // file contained in this directory
 160                 // (so ChangePathTo("dir/subdir/xh.htm") sets m_Path to "dir/subdir/")
 161
 162             wxString GetPath() const {return m_Path;}
 163
 164         wxFSFile* OpenFile(const wxString& location);
 165                 // opens given file and returns pointer to input stream.
 166                 // Returns NULL if opening failed.
 167                 // It first tries to open the file in relative scope
 168                 // (based on ChangePathTo()'s value) and then as an absolute
 169                 // path.
 170
 171         wxString FindFirst(const wxString& spec, int flags = 0);
 172         wxString FindNext();
 173                 // Finds first/next file that matches spec wildcard. flags can be wxDIR for restricting
 174                 // the query to directories or wxFILE for files only or 0 for either.
 175                 // Returns filename or empty string if no more matching file exists
 176
 177
 178         static void AddHandler(wxFileSystemHandler *handler);
 179                 // Adds FS handler.
 180                 // In fact, this class is only front-end to the FS hanlers :-)
 181
 182         static void CleanUpHandlers();
 183                 // remove all items from the m_Handlers list
 184
 185     private:
 186         wxString m_Path;
 187                 // the path (location) we are currently in
 188                 // this is path, not file!
 189                 // (so if you opened test/demo.htm, it is
 190                 // "test/", not "test/demo.htm")
 191         wxString m_LastName;
 192                 // name of last opened file (full path)
 193         static wxList m_Handlers;
 194                 // list of FS handlers
 195         wxFileSystemHandler *m_FindFileHandler;
 196                 // handler that succeed in FindFirst query
 197 };
 198
 199
 200 /*
 201
 202 'location' syntax:
 203
 204 To determine FS type, we're using standard KDE notation:
 205 file:/absolute/path/file.htm
 206 file:relative_path/xxxxx.html
 207 /some/path/x.file               ('file:' is default)
 208 http://www.gnome.org
 209 file:subdir/archive.tar.gz#tar:/README.txt
 210
 211 special characters :
 212   ':' - FS identificator is before this char
 213   '#' - separator. It can be either HTML anchor ("index.html#news")
 214             (in case there is no ':' in the string to the right from it)
 215         or FS separator
 216             (example : http://www.wxhtml.org/wxhtml-0.1.tar.gz#tar:/include/wxhtml/filesys.h"
 217              this would access tgz archive stored on web)
 218   '/' - directory (path) separator. It is used to determine upper-level path.
 219         HEY! Don't use \ even if you're on Windows!
 220
 221 */
 222
 223 #endif
 224   // (wxUSE_FS_INET || wxUSE_FS_ZIP) && wxUSE_STREAMS
 225
 226 #endif
 227   // __FILESYS_H__