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 _WX_WXMMSTREAM_H__
  12 #define _WX_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: public virtual wxMemoryStreamBase, public wxInputStream {
  31  public:
  32   wxMemoryInputStream(const char *data, size_t length);
  33   virtual ~wxMemoryInputStream();
  34
  35   char Peek();
  36
  37  protected:
  38
  39   size_t DoRead(void *buffer, size_t size);
  40   off_t DoSeekInput(off_t pos, wxSeekMode mode);
  41   off_t DoTellInput() const { return m_position_i; }
  42
  43  protected:
  44   off_t m_position_i;
  45 };
  46
  47 class wxMemoryOutputStream: public virtual wxMemoryStreamBase, public wxOutputStream {
  48  public:
  49   wxMemoryOutputStream(char *data = NULL, size_t length = 0);
  50   virtual ~wxMemoryOutputStream();
  51
  52   char *GetData() { Sync(); return m_buffer; }
  53   size_t GetLength() { Sync(); return m_length; }
  54
  55  protected:
  56
  57   size_t DoWrite(const void *buffer, size_t size);
  58   off_t DoSeekOutput(off_t pos, wxSeekMode mode);
  59   off_t DoTellOutput() const { return m_position_o; }
  60
  61  protected:
  62   off_t m_position_o;
  63 };
  64
  65 class wxMemoryStream: public wxMemoryInputStream, public wxMemoryOutputStream {
  66  public:
  67   wxMemoryStream(char *data = NULL, size_t length = 0);
  68   virtual ~wxMemoryStream();
  69 };
  70
  71 #endif