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