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/defs.h"
  16
  17 #if wxUSE_STREAMS
  18
  19 #include "wx/stream.h"
  20
  21 class WXDLLIMPEXP_BASE wxMemoryOutputStream;
  22
  23 class WXDLLIMPEXP_BASE wxMemoryInputStream : public wxInputStream
  24 {
  25 public:
  26     wxMemoryInputStream(const void *data, size_t length);
  27     wxMemoryInputStream(const wxMemoryOutputStream& stream);
  28     virtual ~wxMemoryInputStream();
  29     virtual wxFileOffset GetLength() const { return m_length; }
  30     virtual bool Eof() const;
  31     virtual bool IsSeekable() const { return true; }
  32
  33     char Peek();
  34
  35     wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
  36
  37     // deprecated, compatibility only
  38     wxStreamBuffer *InputStreamBuffer() const { return m_i_streambuf; }
  39
  40 protected:
  41     wxStreamBuffer *m_i_streambuf;
  42
  43     size_t OnSysRead(void *buffer, size_t nbytes);
  44     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  45     wxFileOffset OnSysTell() const;
  46
  47 private:
  48     size_t m_length;
  49
  50     DECLARE_NO_COPY_CLASS(wxMemoryInputStream)
  51 };
  52
  53 class WXDLLIMPEXP_BASE wxMemoryOutputStream : public wxOutputStream
  54 {
  55 public:
  56     // if data is !NULL it must be allocated with malloc()
  57     wxMemoryOutputStream(void *data = NULL, size_t length = 0);
  58     virtual ~wxMemoryOutputStream();
  59     virtual wxFileOffset GetLength() const { return m_o_streambuf->GetLastAccess(); }
  60     virtual bool IsSeekable() const { return true; }
  61
  62     size_t CopyTo(void *buffer, size_t len) const;
  63
  64     wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
  65
  66     // deprecated, compatibility only
  67     wxStreamBuffer *OutputStreamBuffer() const { return m_o_streambuf; }
  68
  69 protected:
  70     wxStreamBuffer *m_o_streambuf;
  71
  72 protected:
  73     size_t OnSysWrite(const void *buffer, size_t nbytes);
  74     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  75     wxFileOffset OnSysTell() const;
  76
  77     DECLARE_NO_COPY_CLASS(wxMemoryOutputStream)
  78 };
  79
  80 #endif
  81   // wxUSE_STREAMS
  82
  83 #endif
  84   // _WX_WXMMSTREAM_H__
  85