include/wx/mstream.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/mstream.h
   3 // Purpose:     Memory stream classes
   4 // Author:      Guilhem Lavaux
   5 // Modified by:
   6 // Created:     11/07/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Guilhem Lavaux
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_WXMMSTREAM_H__
  13 #define _WX_WXMMSTREAM_H__
  14
  15 #include "wx/stream.h"
  16
  17 #if wxUSE_STREAMS
  18
  19 class WXDLLIMPEXP_BASE wxMemoryInputStream : public wxInputStream
  20 {
  21 public:
  22     wxMemoryInputStream(const void *data, size_t length);
  23     virtual ~wxMemoryInputStream();
  24     virtual wxFileOffset GetLength() const { return m_length; }
  25     virtual bool Eof() const;
  26     virtual bool IsSeekable() const { return true; }
  27
  28     char Peek();
  29
  30     wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
  31
  32     // deprecated, compatibility only
  33     wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }
  34
  35 protected:
  36     wxStreamBuffer *m_i_streambuf;
  37
  38     size_t OnSysRead(void *buffer, size_t nbytes);
  39     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  40     wxFileOffset OnSysTell() const;
  41
  42 private:
  43     size_t m_length;
  44
  45     DECLARE_NO_COPY_CLASS(wxMemoryInputStream)
  46 };
  47
  48 class WXDLLIMPEXP_BASE wxMemoryOutputStream : public wxOutputStream
  49 {
  50 public:
  51     // if data is !NULL it must be allocated with malloc()
  52     wxMemoryOutputStream(void *data = NULL, size_t length = 0);
  53     virtual ~wxMemoryOutputStream();
  54     virtual wxFileOffset GetLength() const { return m_o_streambuf->GetLastAccess(); }
  55     virtual bool IsSeekable() const { return true; }
  56
  57     size_t CopyTo(void *buffer, size_t len) const;
  58
  59     wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
  60
  61     // deprecated, compatibility only
  62     wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; }
  63
  64 protected:
  65     wxStreamBuffer *m_o_streambuf;
  66
  67 protected:
  68     size_t OnSysWrite(const void *buffer, size_t nbytes);
  69     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  70     wxFileOffset OnSysTell() const;
  71
  72     DECLARE_NO_COPY_CLASS(wxMemoryOutputStream)
  73 };
  74
  75 #endif
  76   // wxUSE_STREAMS
  77
  78 #endif
  79   // _WX_WXMMSTREAM_H__
  80