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_FS_INET
  33
  34 #ifndef WXPRECOMP
  35 #include <wx/wx.h>
  36 #endif
  37
  38 #include "wx/wfstream.h"
  39 #include "wx/url.h"
  40 #include "wx/filesys.h"
  41 #include "wx/fs_inet.h"
  42
  43 class wxInetCacheNode : public wxObject
  44 {
  45     private:
  46         wxString m_Temp;
  47         wxString m_Mime;
  48
  49     public:
  50         wxInetCacheNode(const wxString& l, const wxString& m) : wxObject() {m_Temp = l; m_Mime = m;}
  51         const wxString& GetTemp() const {return m_Temp;}
  52         const wxString& GetMime() const {return m_Mime;}
  53 };
  54
  55
  56
  57
  58
  59 //--------------------------------------------------------------------------------
  60 // wxInternetFSHandler
  61 //--------------------------------------------------------------------------------
  62
  63
  64 bool wxInternetFSHandler::CanOpen(const wxString& location)
  65 {
  66     wxString p = GetProtocol(location);
  67     return (p == "http") || (p == "ftp");
  68 }
  69
  70
  71
  72
  73 wxFSFile* wxInternetFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
  74 {
  75     wxString right = GetProtocol(location) + ":" + GetRightLocation(location);
  76     wxInputStream *s;
  77     wxString content;
  78     wxInetCacheNode *info;
  79
  80     info = (wxInetCacheNode*) m_Cache.Get(right);
  81
  82     // Add item into cache:
  83     if (info == NULL) {
  84         wxURL url(right);
  85         s = url.GetInputStream();
  86         content = url.GetProtocol().GetContentType();
  87         if (content == wxEmptyString) content = GetMimeTypeFromExt(location);
  88         if (s) {
  89             char buf[256];
  90
  91             wxGetTempFileName("wxhtml", buf);
  92             info = new wxInetCacheNode(buf, content);
  93             m_Cache.Put(right, info);
  94
  95             {   // ok, now copy it:
  96                 wxFileOutputStream sout(buf);
  97                 s -> Read(sout); // copy the stream
  98             }
  99             delete s;
 100         }
 101         else return NULL; //we can't open the URL
 102     }
 103
 104     // Load item from cache:
 105     s = new wxFileInputStream(info -> GetTemp());
 106     if (s) {
 107         return new wxFSFile(s,
 108                             right,
 109                             info -> GetMime(),
 110                             GetAnchor(location));
 111     }
 112     else return NULL;
 113 }
 114
 115
 116
 117 wxInternetFSHandler::~wxInternetFSHandler()
 118 {
 119     wxNode *n;
 120     wxInetCacheNode *n2;
 121
 122     m_Cache.BeginFind();
 123     while ((n = m_Cache.Next()) != NULL) {
 124         n2 = (wxInetCacheNode*) n -> GetData();
 125         wxRemoveFile(n2 -> GetTemp());
 126         delete n2;
 127     }
 128 }
 129
 130 #endif // wxUSE_FS_INET