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 // Licence:     wxWindows Licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 #ifndef __FILESYS_H__
  10 #define __FILESYS_H__
  11
  12 #ifdef __GNUG__
  13 #pragma interface
  14 #endif
  15
  16 #include "wx/setup.h"
  17
  18 #if (wxUSE_FS_INET || wxUSE_FS_ZIP) && wxUSE_STREAMS
  19
  20 #include "wx/stream.h"
  21 #include "wx/mimetype.h"
  22 #include "wx/url.h"
  23
  24
  25 class wxFSFile;
  26 class wxFileSystemHandler;
  27 class wxFileSystem;
  28
  29 //--------------------------------------------------------------------------------
  30 // wxFSFile
  31 //                  This class is a file opened using wxFileSystem. It consists of
  32 //                  input stream, location, mime type & optional anchor
  33 //                  (in 'index.htm#chapter2', 'chapter2' is anchor)
  34 //--------------------------------------------------------------------------------
  35
  36 class WXDLLEXPORT wxFSFile : public wxObject
  37 {
  38     private:
  39         wxInputStream *m_Stream;
  40         wxString m_Location;
  41         wxString m_MimeType;
  42         wxString m_Anchor;
  43
  44     public:
  45         wxFSFile(wxInputStream *stream, const wxString& loc, const wxString& mimetype, const wxString& anchor)
  46             {
  47                 m_Stream = stream;
  48                 m_Location = loc;
  49                 m_MimeType = mimetype; m_MimeType.MakeLower();
  50                 m_Anchor = anchor;
  51             }
  52         virtual ~wxFSFile()
  53             {
  54                 if (m_Stream) delete m_Stream;
  55             }
  56
  57         wxInputStream *GetStream() const {return m_Stream;}
  58                 // returns stream. This doesn't _create_ stream, it only returns
  59                 // pointer to it!!
  60
  61         const wxString& GetMimeType() const {return m_MimeType;}
  62                 // returns file's mime type
  63
  64         const wxString& GetLocation() const {return m_Location;}
  65                 // returns the original location (aka filename) of the file
  66
  67         const wxString& GetAnchor() const {return m_Anchor;}
  68 };
  69
  70
  71
  72
  73
  74 //--------------------------------------------------------------------------------
  75 // wxFileSystemHandler
  76 //                  This class is FS handler for wxFileSystem. It provides
  77 //                  interface to access certain
  78 //                  kinds of files (HTPP, FTP, local, tar.gz etc..)
  79 //--------------------------------------------------------------------------------
  80
  81 class WXDLLEXPORT wxFileSystemHandler : public wxObject
  82 {
  83     DECLARE_ABSTRACT_CLASS(wxFileSystemHandler)
  84
  85     public:
  86         wxFileSystemHandler() : wxObject() {}
  87
  88         virtual bool CanOpen(const wxString& location) = 0;
  89                 // returns TRUE if this handler is able to open given location
  90
  91         virtual wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location) = 0;
  92                 // opens given file and returns pointer to input stream.
  93                 // Returns NULL if opening failed.
  94                 // The location is always absolute path.
  95
  96     protected:
  97         wxString GetProtocol(const wxString& location) const;
  98                 // returns protocol ("file", "http", "tar" etc.) The last (most right)
  99                 // protocol is used:
 100                 // {it returns "tar" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 101
 102         wxString GetLeftLocation(const wxString& location) const;
 103                 // returns left part of address:
 104                 // {it returns "file:subdir/archive.tar.gz" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 105
 106         wxString GetAnchor(const wxString& location) const;
 107                 // returns anchor part of address:
 108                 // {it returns "anchor" for "file:subdir/archive.tar.gz#tar:/README.txt#anchor"}
 109                 // NOTE:  anchor is NOT a part of GetLeftLocation()'s return value
 110
 111         wxString GetRightLocation(const wxString& location) const;
 112                 // returns right part of address:
 113                 // {it returns "/README.txt" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 114
 115         wxString GetMimeTypeFromExt(const wxString& location);
 116                 // Returns MIME type of the file - w/o need to open it
 117                 // (default behaviour is that it returns type based on extension)
 118
 119     private:
 120         static wxMimeTypesManager m_MimeMng;
 121                 // MIME manager
 122         // (it's static and thus shared by all instances and derived classes)
 123 };
 124
 125
 126
 127
 128 //--------------------------------------------------------------------------------
 129 // wxFileSystem
 130 //                  This class provides simple interface for opening various
 131 //                  kinds of files (HTPP, FTP, local, tar.gz etc..)
 132 //--------------------------------------------------------------------------------
 133
 134 class WXDLLEXPORT wxFileSystem : public wxObject
 135 {
 136     DECLARE_DYNAMIC_CLASS(wxFileSystem)
 137
 138     private:
 139         wxString m_Path;
 140                 // the path (location) we are currently in
 141                 // this is path, not file!
 142                 // (so if you opened test/demo.htm, it is
 143                 // "test/", not "test/demo.htm")
 144         wxString m_LastName;
 145                 // name of last opened file (full path)
 146         static wxList m_Handlers;
 147                 // list of FS handlers
 148
 149     public:
 150         wxFileSystem() : wxObject() {m_Path = m_LastName = wxEmptyString; m_Handlers.DeleteContents(TRUE);}
 151
 152         void ChangePathTo(const wxString& location, bool is_dir = FALSE);
 153                 // sets the current location. Every call to OpenFile is
 154                 // relative to this location.
 155                 // NOTE !!
 156                 // unless is_dir = TRUE 'location' is *not* the directory but
 157                 // file contained in this directory
 158                 // (so ChangePathTo("dir/subdir/xh.htm") sets m_Path to "dir/subdir/")
 159
 160         wxString GetPath() const {return m_Path;}
 161
 162         wxFSFile* OpenFile(const wxString& location);
 163                 // opens given file and returns pointer to input stream.
 164                 // Returns NULL if opening failed.
 165                 // It first tries to open the file in relative scope
 166                 // (based on ChangePathTo()'s value) and then as an absolute
 167                 // path.
 168
 169         static void AddHandler(wxFileSystemHandler *handler);
 170                 // Adds FS handler.
 171                 // In fact, this class is only front-end to the FS hanlers :-)
 172 };
 173
 174
 175 /*
 176
 177 'location' syntax:
 178
 179 To determine FS type, we're using standard KDE notation:
 180 file:/absolute/path/file.htm
 181 file:relative_path/xxxxx.html
 182 /some/path/x.file               ('file:' is default)
 183 http://www.gnome.org
 184 file:subdir/archive.tar.gz#tar:/README.txt
 185
 186 special characters :
 187   ':' - FS identificator is before this char
 188   '#' - separator. It can be either HTML anchor ("index.html#news")
 189             (in case there is no ':' in the string to the right from it)
 190         or FS separator
 191             (example : http://www.wxhtml.org/wxhtml-0.1.tar.gz#tar:/include/wxhtml/filesys.h"
 192              this would access tgz archive stored on web)
 193   '/' - directory (path) separator. It is used to determine upper-level path.
 194         HEY! Don't use \ even if you're on Windows!
 195
 196 */
 197
 198 #endif
 199   // (wxUSE_FS_INET || wxUSE_FS_ZIP) && wxUSE_STREAMS
 200
 201 #endif
 202   // __FILESYS_H__