text: /////////////////////////////////////////////////////////////////////////////
  // Name:        wx/mstream.h
  // Purpose:     Memory stream classes
  // Author:      Guilhem Lavaux
  // Modified by:
  // Created:     11/07/98
  // RCS-ID:      $Id: mstream.h 53135 2008-04-12 02:31:04Z VZ $
  // Copyright:   (c) Guilhem Lavaux
  // Licence:     wxWindows licence
  /////////////////////////////////////////////////////////////////////////////
  
  #ifndef _WX_WXMMSTREAM_H__
  #define _WX_WXMMSTREAM_H__
  
  #include "wx/defs.h"
  
  #if wxUSE_STREAMS
  
  #include "wx/stream.h"
  
  class WXDLLIMPEXP_FWD_BASE wxMemoryOutputStream;
  
  class WXDLLIMPEXP_BASE wxMemoryInputStream : public wxInputStream
  {
  public:
      wxMemoryInputStream(const void *data, size_t length);
      wxMemoryInputStream(const wxMemoryOutputStream& stream);
      virtual ~wxMemoryInputStream();
      virtual wxFileOffset GetLength() const { return m_length; }
      virtual bool IsSeekable() const { return true; }
  
      char Peek();
  
      wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
  
  #if WXWIN_COMPATIBILITY_2_6
      // deprecated, compatibility only
      wxDEPRECATED( wxStreamBuffer *InputStreamBuffer() const );
  #endif // WXWIN_COMPATIBILITY_2_6
  
  protected:
      wxStreamBuffer *m_i_streambuf;
  
      size_t OnSysRead(void *buffer, size_t nbytes);
      wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
      wxFileOffset OnSysTell() const;
  
  private:
      size_t m_length;
  
      DECLARE_NO_COPY_CLASS(wxMemoryInputStream)
  };
  
  class WXDLLIMPEXP_BASE wxMemoryOutputStream : public wxOutputStream
  {
  public:
      // if data is !NULL it must be allocated with malloc()
      wxMemoryOutputStream(void *data = NULL, size_t length = 0);
      virtual ~wxMemoryOutputStream();
      virtual wxFileOffset GetLength() const { return m_o_streambuf->GetLastAccess(); }
      virtual bool IsSeekable() const { return true; }
  
      size_t CopyTo(void *buffer, size_t len) const;
  
      wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
  
  #if WXWIN_COMPATIBILITY_2_6
      // deprecated, compatibility only
      wxDEPRECATED( wxStreamBuffer *OutputStreamBuffer() const );
  #endif // WXWIN_COMPATIBILITY_2_6
  
  protected:
      wxStreamBuffer *m_o_streambuf;
  
  protected:
      size_t OnSysWrite(const void *buffer, size_t nbytes);
      wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
      wxFileOffset OnSysTell() const;
  
      DECLARE_NO_COPY_CLASS(wxMemoryOutputStream)
  };
  
  #if WXWIN_COMPATIBILITY_2_6
      inline wxStreamBuffer *wxMemoryInputStream::InputStreamBuffer() const { return m_i_streambuf; }
      inline wxStreamBuffer *wxMemoryOutputStream::OutputStreamBuffer() const { return m_o_streambuf; }
  #endif // WXWIN_COMPATIBILITY_2_6
  
  #endif
    // wxUSE_STREAMS
  
  #endif
    // _WX_WXMMSTREAM_H__
  