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fs_inet.cpp
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C/C++ Source or Header
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2001-07-05
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/////////////////////////////////////////////////////////////////////////////
// Name: fs_inet.cpp
// Purpose: HTTP and FTP file system
// Author: Vaclav Slavik
// Copyright: (c) 1999 Vaclav Slavik
// Licence: wxWindows Licence
/////////////////////////////////////////////////////////////////////////////
/*
REMARKS :
This FS creates local cache (in /tmp directory). The cache is freed
on program exit.
Size of cache is limited to cca 1000 items (due to GetTempFileName
limitation)
*/
#ifdef __GNUG__
#pragma implementation "fs_inet.h"
#endif
#include "wx/wxprec.h"
#ifdef __BORDLANDC__
#pragma hdrstop
#endif
#if !wxUSE_SOCKETS
#undef wxUSE_FS_INET
#define wxUSE_FS_INET 0
#endif
#if wxUSE_FILESYSTEM && wxUSE_FS_INET
#ifndef WXPRECOMP
#endif
#include "wx/wfstream.h"
#include "wx/url.h"
#include "wx/filesys.h"
#include "wx/fs_inet.h"
#include "wx/module.h"
class wxInetCacheNode : public wxObject
{
private:
wxString m_Temp;
wxString m_Mime;
public:
wxInetCacheNode(const wxString& l, const wxString& m) : wxObject() {m_Temp = l; m_Mime = m;}
const wxString& GetTemp() const {return m_Temp;}
const wxString& GetMime() const {return m_Mime;}
};
//--------------------------------------------------------------------------------
// wxInternetFSHandler
//--------------------------------------------------------------------------------
static wxString StripProtocolAnchor(const wxString& location)
{
wxString myloc(location.BeforeLast(wxT('#')));
if (myloc.IsEmpty()) myloc = location.AfterFirst(wxT(':'));
else myloc = myloc.AfterFirst(wxT(':'));
// fix malformed url:
if (myloc.Left(2) != wxT("//"))
{
if (myloc.GetChar(0) != wxT('/')) myloc = wxT("//") + myloc;
else myloc = wxT("/") + myloc;
}
if (myloc.Mid(2).Find(wxT('/')) == wxNOT_FOUND) myloc << wxT('/');
return myloc;
}
bool wxInternetFSHandler::CanOpen(const wxString& location)
{
wxString p = GetProtocol(location);
if ((p == wxT("http")) || (p == wxT("ftp")))
{
wxURL url(p + wxT(":") + StripProtocolAnchor(location));
return (url.GetError() == wxURL_NOERR);
}
return FALSE;
}
wxFSFile* wxInternetFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
{
wxString right = GetProtocol(location) + wxT(":") + StripProtocolAnchor(location);
wxInputStream *s;
wxString content;
wxInetCacheNode *info;
info = (wxInetCacheNode*) m_Cache.Get(right);
// Add item into cache:
if (info == NULL)
{
wxURL url(right);
if (url.GetError() == wxURL_NOERR)
{
s = url.GetInputStream();
content = url.GetProtocol().GetContentType();
if (content == wxEmptyString) content = GetMimeTypeFromExt(location);
if (s)
{
wxChar buf[256];
wxGetTempFileName( wxT("wxhtml"), buf);
info = new wxInetCacheNode(buf, content);
m_Cache.Put(right, info);
{ // ok, now copy it:
wxFileOutputStream sout((wxString)buf);
s -> Read(sout); // copy the stream
}
delete s;
}
else
return (wxFSFile*) NULL; // we can't open the URL
}
else
return (wxFSFile*) NULL; // incorrect URL
}
// Load item from cache:
s = new wxFileInputStream(info->GetTemp());
if (!s)
return (wxFSFile*) NULL;
return new wxFSFile(s,
right,
info->GetMime(),
GetAnchor(location),
wxDateTime::Now());
}
wxInternetFSHandler::~wxInternetFSHandler()
{
wxNode *n;
wxInetCacheNode *n2;
m_Cache.BeginFind();
while ((n = m_Cache.Next()) != NULL)
{
n2 = (wxInetCacheNode*) n->GetData();
wxRemoveFile(n2->GetTemp());
delete n2;
}
}
class wxFileSystemInternetModule : public wxModule
{
DECLARE_DYNAMIC_CLASS(wxFileSystemInternetModule)
public:
virtual bool OnInit()
{
wxFileSystem::AddHandler(new wxInternetFSHandler);
return TRUE;
}
virtual void OnExit() {}
};
IMPLEMENT_DYNAMIC_CLASS(wxFileSystemInternetModule, wxModule)
#endif // wxUSE_FILESYSTEM && wxUSE_FS_INET