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fs_mem.cpp
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C/C++ Source or Header
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2002-07-30
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5KB
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213 lines
/////////////////////////////////////////////////////////////////////////////
// Name: fs_mem.cpp
// Purpose: in-memory file system
// Author: Vaclav Slavik
// Copyright: (c) 2000 Vaclav Slavik
// Licence: wxWindows Licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "fs_mem.h"
#endif
#include "wx/wxprec.h"
#ifdef __BORDLANDC__
#pragma hdrstop
#endif
#if wxUSE_FILESYSTEM && wxUSE_STREAMS
#ifndef WXPRECOMP
#include "wx/intl.h"
#include "wx/log.h"
#include "wx/hash.h"
#endif
#include "wx/filesys.h"
#include "wx/fs_mem.h"
#include "wx/mstream.h"
class MemFSHashObj : public wxObject
{
public:
MemFSHashObj(const void *data, size_t len)
{
m_Data = new char[len];
memcpy(m_Data, data, len);
m_Len = len;
m_Time = wxDateTime::Now();
}
MemFSHashObj(wxMemoryOutputStream& stream)
{
m_Len = stream.GetSize();
m_Data = new char[m_Len];
stream.CopyTo(m_Data, m_Len);
m_Time = wxDateTime::Now();
}
~MemFSHashObj()
{
delete[] m_Data;
}
char *m_Data;
size_t m_Len;
wxDateTime m_Time;
};
//--------------------------------------------------------------------------------
// wxMemoryFSHandler
//--------------------------------------------------------------------------------
wxHashTable *wxMemoryFSHandler::m_Hash = NULL;
wxMemoryFSHandler::wxMemoryFSHandler() : wxFileSystemHandler()
{
}
wxMemoryFSHandler::~wxMemoryFSHandler()
{
// as only one copy of FS handler is supposed to exist, we may silently
// delete static data here. (There is no way how to remove FS handler from
// wxFileSystem other than releasing _all_ handlers.)
if (m_Hash) delete m_Hash;
m_Hash = NULL;
}
bool wxMemoryFSHandler::CanOpen(const wxString& location)
{
wxString p = GetProtocol(location);
return (p == wxT("memory"));
}
wxFSFile* wxMemoryFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
{
if (m_Hash)
{
MemFSHashObj *obj = (MemFSHashObj*) m_Hash -> Get(GetRightLocation(location));
if (obj == NULL) return NULL;
else return new wxFSFile(new wxMemoryInputStream(obj -> m_Data, obj -> m_Len),
location,
GetMimeTypeFromExt(location),
GetAnchor(location),
obj -> m_Time);
}
else return NULL;
}
wxString wxMemoryFSHandler::FindFirst(const wxString& WXUNUSED(spec),
int WXUNUSED(flags))
{
wxFAIL_MSG(wxT("wxMemoryFSHandler::FindFirst not implemented"));
return wxEmptyString;
}
wxString wxMemoryFSHandler::FindNext()
{
wxFAIL_MSG(wxT("wxMemoryFSHandler::FindNext not implemented"));
return wxEmptyString;
}
bool wxMemoryFSHandler::CheckHash(const wxString& filename)
{
if (m_Hash == NULL)
{
m_Hash = new wxHashTable(wxKEY_STRING);
m_Hash -> DeleteContents(TRUE);
}
if (m_Hash -> Get(filename) != NULL)
{
wxString s;
s.Printf(_("Memory VFS already contains file '%s'!"), filename.c_str());
wxLogError(s);
return FALSE;
}
else
return TRUE;
}
#if wxUSE_GUI
/*static*/ void wxMemoryFSHandler::AddFile(const wxString& filename, wxImage& image, long type)
{
if (!CheckHash(filename)) return;
wxMemoryOutputStream mems;
if (image.Ok() && image.SaveFile(mems, (int)type))
m_Hash -> Put(filename, new MemFSHashObj(mems));
else
{
wxString s;
s.Printf(_("Failed to store image '%s' to memory VFS!"), filename.c_str());
wxPrintf(wxT("'%s'\n"), s.c_str());
wxLogError(s);
}
}
/*static*/ void wxMemoryFSHandler::AddFile(const wxString& filename, const wxBitmap& bitmap, long type)
{
wxImage img = bitmap.ConvertToImage();
AddFile(filename, img, type);
}
#endif
/*static*/ void wxMemoryFSHandler::AddFile(const wxString& filename, const wxString& textdata)
{
AddFile(filename, (const void*) textdata.mb_str(), textdata.Length());
}
/*static*/ void wxMemoryFSHandler::AddFile(const wxString& filename, const void *binarydata, size_t size)
{
if (!CheckHash(filename)) return;
m_Hash -> Put(filename, new MemFSHashObj(binarydata, size));
}
/*static*/ void wxMemoryFSHandler::RemoveFile(const wxString& filename)
{
if (m_Hash == NULL ||
m_Hash -> Get(filename) == NULL)
{
wxString s;
s.Printf(_("Trying to remove file '%s' from memory VFS, but it is not loaded!"), filename.c_str());
wxLogError(s);
}
else
delete m_Hash -> Delete(filename);
}
#endif // wxUSE_FILESYSTEM && wxUSE_FS_ZIP