include/wx/mstream.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifndef __WXMMSTREAM_H__
  12 #define __WXMMSTREAM_H__
  13
  14 #include <wx/stream.h>
  15
  16 class wxMemoryStreamBase {
  17  protected:
  18   wxMemoryStreamBase();
  19   virtual ~wxMemoryStreamBase();
  20
  21   bool ChangeBufferSize(size_t new_length);
  22
  23  protected:
  24   bool m_persistent;
  25   size_t m_length;
  26   char *m_buffer;
  27   int m_iolimit;
  28 };
  29
  30 class wxMemoryInputStream: virtual public wxMemoryStreamBase, public wxInputStream {
  31  public:
  32   wxMemoryInputStream(const char *data, size_t length);
  33   virtual ~wxMemoryInputStream();
  34
  35  protected:
  36
  37   size_t DoRead(void *buffer, size_t size);
  38   off_t DoSeekInput(off_t pos, wxSeekMode mode);
  39   off_t DoTellInput() const { return m_position_i; }
  40
  41  protected:
  42   off_t m_position_i;
  43 };
  44
  45 class wxMemoryOutputStream: virtual public wxMemoryStreamBase, public wxOutputStream {
  46  public:
  47   wxMemoryOutputStream(char *data = NULL, size_t length = 0);
  48   virtual ~wxMemoryOutputStream();
  49
  50   char *GetData() { Sync(); return m_buffer; }
  51   size_t GetLength() { Sync(); return m_length; }
  52
  53  protected:
  54
  55   size_t DoWrite(const void *buffer, size_t size);
  56   off_t DoSeekOutput(off_t pos, wxSeekMode mode);
  57   off_t DoTellOutput() const { return m_position_o; }
  58
  59  protected:
  60   off_t m_position_o;
  61 };
  62
  63 class wxMemoryStream: public wxMemoryInputStream, public wxMemoryOutputStream {
  64  public:
  65   wxMemoryStream(char *data = NULL, size_t length = 0);
  66   virtual ~wxMemoryStream();
  67 };
  68
  69 #endif