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
  48 class wxInetCacheNode : public wxObject
  49 {
  50     private:
  51         wxString m_Temp;
  52         wxString m_Mime;
  53
  54     public:
  55         wxInetCacheNode(const wxString& l, const wxString& m) : wxObject() {m_Temp = l; m_Mime = m;}
  56         const wxString& GetTemp() const {return m_Temp;}
  57         const wxString& GetMime() const {return m_Mime;}
  58 };
  59
  60
  61
  62
  63
  64 //--------------------------------------------------------------------------------
  65 // wxInternetFSHandler
  66 //--------------------------------------------------------------------------------
  67
  68
  69 bool wxInternetFSHandler::CanOpen(const wxString& location)
  70 {
  71     wxString p = GetProtocol(location);
  72     return (p == wxT("http")) || (p == wxT("ftp"));
  73 }
  74
  75
  76 wxFSFile* wxInternetFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
  77 {
  78     wxString right = GetProtocol(location) + wxT(":") + GetRightLocation(location);
  79     wxInputStream *s;
  80     wxString content;
  81     wxInetCacheNode *info;
  82
  83     info = (wxInetCacheNode*) m_Cache.Get(right);
  84
  85     // Add item into cache:
  86     if (info == NULL)
  87     {
  88         wxURL url(right);
  89         s = url.GetInputStream();
  90         content = url.GetProtocol().GetContentType();
  91         if (content == wxEmptyString) content = GetMimeTypeFromExt(location);
  92         if (s)
  93         {
  94             wxChar buf[256];
  95
  96             wxGetTempFileName( wxT("wxhtml"), buf);
  97             info = new wxInetCacheNode(buf, content);
  98             m_Cache.Put(right, info);
  99
 100             {   // ok, now copy it:
 101                 wxFileOutputStream sout((wxString)buf);
 102                 s -> Read(sout); // copy the stream
 103             }
 104             delete s;
 105         }
 106         else
 107         {
 108             return (wxFSFile*) NULL; // we can't open the URL
 109         }
 110     }
 111
 112     // Load item from cache:
 113     s = new wxFileInputStream(info->GetTemp());
 114     if (s)
 115     {
 116         return new wxFSFile(s,
 117                             right,
 118                             info->GetMime(),
 119                             GetAnchor(location));
 120     }
 121     else return (wxFSFile*) NULL;
 122 }
 123
 124
 125
 126 wxInternetFSHandler::~wxInternetFSHandler()
 127 {
 128     wxNode *n;
 129     wxInetCacheNode *n2;
 130
 131     m_Cache.BeginFind();
 132     while ((n = m_Cache.Next()) != NULL)
 133     {
 134         n2 = (wxInetCacheNode*) n->GetData();
 135         wxRemoveFile(n2->GetTemp());
 136         delete n2;
 137     }
 138 }
 139
 140 class wxFileSystemInternetModule : public wxModule
 141 {
 142     DECLARE_DYNAMIC_CLASS(wxFileSystemInternetModule)
 143
 144     public:
 145         virtual bool OnInit()
 146         {
 147             wxFileSystem::AddHandler(new wxInternetFSHandler);
 148             return TRUE;
 149         }
 150         virtual void OnExit() {}
 151 };
 152
 153 IMPLEMENT_DYNAMIC_CLASS(wxFileSystemInternetModule, wxModule)
 154
 155 #endif // wxUSE_FS_INET