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