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_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/url.h"
  31 #include "wx/datetime.h"
  32
  33 class wxFSFile;
  34 class wxFileSystemHandler;
  35 class 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 WXDLLEXPORT wxFSFile : public wxObject
  45 {
  46 public:
  47     wxFSFile(wxInputStream *stream, const wxString& loc,
  48              const wxString& mimetype, const wxString& anchor,
  49              wxDateTime modif)
  50     {
  51         m_Stream = stream;
  52         m_Location = loc;
  53         m_MimeType = mimetype; m_MimeType.MakeLower();
  54         m_Anchor = anchor;
  55         m_Modif = modif;
  56     }
  57     virtual ~wxFSFile() { if (m_Stream) delete m_Stream; }
  58
  59     // returns stream. This doesn't _create_ stream, it only returns
  60     // pointer to it!!
  61     wxInputStream *GetStream() const {return m_Stream;}
  62
  63     // returns file's mime type
  64     const wxString& GetMimeType() const {return m_MimeType;}
  65
  66     // returns the original location (aka filename) of the file
  67     const wxString& GetLocation() const {return m_Location;}
  68
  69     const wxString& GetAnchor() const {return m_Anchor;}
  70
  71     wxDateTime GetModificationTime() const {return m_Modif;}
  72
  73 private:
  74     wxInputStream *m_Stream;
  75     wxString m_Location;
  76     wxString m_MimeType;
  77     wxString m_Anchor;
  78     wxDateTime m_Modif;
  79
  80     DECLARE_ABSTRACT_CLASS(wxFSFile)
  81 };
  82
  83
  84
  85
  86
  87 //--------------------------------------------------------------------------------
  88 // wxFileSystemHandler
  89 //                  This class is FS handler for wxFileSystem. It provides
  90 //                  interface to access certain
  91 //                  kinds of files (HTPP, FTP, local, tar.gz etc..)
  92 //--------------------------------------------------------------------------------
  93
  94 class WXDLLEXPORT wxFileSystemHandler : public wxObject
  95 {
  96 public:
  97     wxFileSystemHandler() : wxObject() {}
  98
  99     // returns TRUE if this handler is able to open given location
 100     virtual bool CanOpen(const wxString& location) = 0;
 101
 102     // opens given file and returns pointer to input stream.
 103     // Returns NULL if opening failed.
 104     // The location is always absolute path.
 105     virtual wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location) = 0;
 106
 107     // Finds first/next file that matches spec wildcard. flags can be wxDIR for restricting
 108     // the query to directories or wxFILE for files only or 0 for either.
 109     // Returns filename or empty string if no more matching file exists
 110     virtual wxString FindFirst(const wxString& spec, int flags = 0);
 111     virtual wxString FindNext();
 112
 113 protected:
 114     // returns protocol ("file", "http", "tar" etc.) The last (most right)
 115     // protocol is used:
 116     // {it returns "tar" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 117     wxString GetProtocol(const wxString& location) const;
 118
 119     // returns left part of address:
 120     // {it returns "file:subdir/archive.tar.gz" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 121     wxString GetLeftLocation(const wxString& location) const;
 122
 123     // returns anchor part of address:
 124     // {it returns "anchor" for "file:subdir/archive.tar.gz#tar:/README.txt#anchor"}
 125     // NOTE:  anchor is NOT a part of GetLeftLocation()'s return value
 126     wxString GetAnchor(const wxString& location) const;
 127
 128     // returns right part of address:
 129     // {it returns "/README.txt" for "file:subdir/archive.tar.gz#tar:/README.txt"}
 130     wxString GetRightLocation(const wxString& location) const;
 131
 132     // Returns MIME type of the file - w/o need to open it
 133     // (default behaviour is that it returns type based on extension)
 134     wxString GetMimeTypeFromExt(const wxString& location);
 135
 136     DECLARE_ABSTRACT_CLASS(wxFileSystemHandler)
 137 };
 138
 139
 140
 141
 142 //--------------------------------------------------------------------------------
 143 // wxFileSystem
 144 //                  This class provides simple interface for opening various
 145 //                  kinds of files (HTPP, FTP, local, tar.gz etc..)
 146 //--------------------------------------------------------------------------------
 147
 148 class WXDLLEXPORT wxFileSystem : public wxObject
 149 {
 150 public:
 151     wxFileSystem() : wxObject() {m_Path = m_LastName = wxEmptyString; m_Handlers.DeleteContents(TRUE); m_FindFileHandler = NULL;}
 152
 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     void ChangePathTo(const wxString& location, bool is_dir = FALSE);
 160
 161     wxString GetPath() const {return m_Path;}
 162
 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     wxFSFile* OpenFile(const wxString& location);
 169
 170     // Finds first/next file that matches spec wildcard. flags can be wxDIR for restricting
 171     // the query to directories or wxFILE for files only or 0 for either.
 172     // Returns filename or empty string if no more matching file exists
 173     wxString FindFirst(const wxString& spec, int flags = 0);
 174     wxString FindNext();
 175
 176     // Adds FS handler.
 177     // In fact, this class is only front-end to the FS hanlers :-)
 178     static void AddHandler(wxFileSystemHandler *handler);
 179
 180     // remove all items from the m_Handlers list
 181     static void CleanUpHandlers();
 182
 183 protected:
 184     wxString m_Path;
 185             // the path (location) we are currently in
 186             // this is path, not file!
 187             // (so if you opened test/demo.htm, it is
 188             // "test/", not "test/demo.htm")
 189     wxString m_LastName;
 190             // name of last opened file (full path)
 191     static wxList m_Handlers;
 192             // list of FS handlers
 193     wxFileSystemHandler *m_FindFileHandler;
 194             // handler that succeed in FindFirst query
 195
 196     DECLARE_DYNAMIC_CLASS(wxFileSystem)
 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
 224 class wxLocalFSHandler : public wxFileSystemHandler
 225 {
 226 public:
 227     virtual bool CanOpen(const wxString& location);
 228     virtual wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location);
 229     virtual wxString FindFirst(const wxString& spec, int flags = 0);
 230     virtual wxString FindNext();
 231
 232     // wxLocalFSHandler will prefix all filenames with 'root' before accessing
 233     // files on disk. This effectively makes 'root' the top-level directory
 234     // and prevents access to files outside this directory.
 235     // (This is similar to Unix command 'chroot'.)
 236     static void Chroot(const wxString& root) { ms_root = root; }
 237
 238 protected:
 239     static wxString ms_root;
 240 };
 241
 242
 243
 244 #endif
 245   // wxUSE_FILESYSTEM
 246
 247 #endif
 248   // __FILESYS_H__