src/common/fs_inet.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        fs_inet.cpp
   3 // Purpose:     HTTP and FTP file system
   4 // Author:      Vaclav Slavik
   5 // Copyright:   (c) 1999 Vaclav Slavik
   6 // Licence:     wxWindows Licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /*
  10
  11 REMARKS :
  12
  13 This FS creates local cache (in /tmp directory). The cache is freed
  14 on program exit.
  15
  16 Size of cache is limited to cca 1000 items (due to GetTempFileName
  17 limitation)
  18
  19
  20 */
  21
  22 #ifdef __GNUG__
  23 #pragma implementation
  24 #endif
  25
  26 #include "wx/wxprec.h"
  27
  28 #ifdef __BORDLANDC__
  29 #pragma hdrstop
  30 #endif
  31
  32 #if !wxUSE_SOCKETS
  33     #undef wxUSE_FS_INET
  34     #define wxUSE_FS_INET 0
  35 #endif
  36
  37 #if wxUSE_FS_INET
  38
  39 #ifndef WXPRECOMP
  40 #include "wx/wx.h"
  41 #endif
  42
  43 #include "wx/wfstream.h"
  44 #include "wx/url.h"
  45 #include "wx/filesys.h"
  46 #include "wx/fs_inet.h"
  47 #include "wx/module.h"
  48
  49 class wxInetCacheNode : public wxObject
  50 {
  51     private:
  52         wxString m_Temp;
  53         wxString m_Mime;
  54
  55     public:
  56         wxInetCacheNode(const wxString& l, const wxString& m) : wxObject() {m_Temp = l; m_Mime = m;}
  57         const wxString& GetTemp() const {return m_Temp;}
  58         const wxString& GetMime() const {return m_Mime;}
  59 };
  60
  61
  62
  63
  64
  65 //--------------------------------------------------------------------------------
  66 // wxInternetFSHandler
  67 //--------------------------------------------------------------------------------
  68
  69
  70 bool wxInternetFSHandler::CanOpen(const wxString& location)
  71 {
  72     wxString p = GetProtocol(location);
  73     if ((p == wxT("http")) || (p == wxT("ftp")))
  74     {
  75         wxURL url(GetProtocol(location) + wxT(":") + GetRightLocation(location));
  76         return (url.GetError() == wxURL_NOERR);
  77     }
  78     else
  79         return FALSE;
  80 }
  81
  82
  83 wxFSFile* wxInternetFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
  84 {
  85     wxString right = GetProtocol(location) + wxT(":") + GetRightLocation(location);
  86     wxInputStream *s;
  87     wxString content;
  88     wxInetCacheNode *info;
  89
  90     info = (wxInetCacheNode*) m_Cache.Get(right);
  91
  92     // Add item into cache:
  93     if (info == NULL)
  94     {
  95         wxURL url(right);
  96         if (url.GetError() == wxURL_NOERR)
  97         {
  98             s = url.GetInputStream();
  99             content = url.GetProtocol().GetContentType();
 100             if (content == wxEmptyString) content = GetMimeTypeFromExt(location);
 101             if (s)
 102             {
 103                 wxChar buf[256];
 104
 105                 wxGetTempFileName( wxT("wxhtml"), buf);
 106                 info = new wxInetCacheNode(buf, content);
 107                 m_Cache.Put(right, info);
 108
 109                 {   // ok, now copy it:
 110                     wxFileOutputStream sout((wxString)buf);
 111                     s -> Read(sout); // copy the stream
 112                 }
 113                 delete s;
 114             }
 115             else
 116                 return (wxFSFile*) NULL; // we can't open the URL
 117         }
 118         else
 119             return (wxFSFile*) NULL; // incorrect URL
 120     }
 121
 122     // Load item from cache:
 123     s = new wxFileInputStream(info->GetTemp());
 124     if (s)
 125     {
 126         return new wxFSFile(s,
 127                             right,
 128                             info->GetMime(),
 129                             GetAnchor(location));
 130     }
 131     else return (wxFSFile*) NULL;
 132 }
 133
 134
 135
 136 wxInternetFSHandler::~wxInternetFSHandler()
 137 {
 138     wxNode *n;
 139     wxInetCacheNode *n2;
 140
 141     m_Cache.BeginFind();
 142     while ((n = m_Cache.Next()) != NULL)
 143     {
 144         n2 = (wxInetCacheNode*) n->GetData();
 145         wxRemoveFile(n2->GetTemp());
 146         delete n2;
 147     }
 148 }
 149
 150 class wxFileSystemInternetModule : public wxModule
 151 {
 152     DECLARE_DYNAMIC_CLASS(wxFileSystemInternetModule)
 153
 154     public:
 155         virtual bool OnInit()
 156         {
 157             wxFileSystem::AddHandler(new wxInternetFSHandler);
 158             return TRUE;
 159         }
 160         virtual void OnExit() {}
 161 };
 162
 163 IMPLEMENT_DYNAMIC_CLASS(wxFileSystemInternetModule, wxModule)
 164
 165 #endif // wxUSE_FS_INET