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/object.h"
  15 #include "wx/stream.h"
  16
  17 class wxMemoryStreamBase: public wxStream {
  18   DECLARE_CLASS(wxMemoryStreamBase)
  19  public:
  20   wxMemoryStreamBase(char *data, size_t length, int iolimit);
  21   virtual ~wxMemoryStreamBase();
  22
  23   // Input part
  24   wxInputStream& Read(void *buffer, size_t size);
  25   size_t SeekI(int pos, wxWhenceType whence = wxBeginPosition);
  26   size_t TellI() const { return m_position_i; }
  27
  28   bool Eof() const { return m_eof; }
  29   size_t LastRead() const { return m_lastread; }
  30
  31   // Output part
  32   wxOutputStream& Write(const void *buffer, size_t size);
  33   size_t SeekO(int pos, wxWhenceType whence = wxBeginPosition);
  34   size_t TellO() const { return m_position_o; }
  35
  36   bool Bad() const { return m_bad; }
  37   size_t LastWrite() const { return m_lastwrite; }
  38   void Sync() {}
  39
  40  protected:
  41   bool ChangeBufferSize(size_t new_length);
  42
  43  protected:
  44   bool m_bad, m_eof, m_persistent;
  45   size_t m_lastread, m_lastwrite;
  46   size_t m_length;
  47   size_t m_position_i, m_position_o;
  48   char *m_buffer;
  49   int m_iolimit;
  50 };
  51
  52
  53 class wxMemoryInputStream: public wxMemoryStreamBase {
  54   DECLARE_CLASS(wxMemoryInputStream)
  55  public:
  56   wxMemoryInputStream(char *data, size_t length)
  57      : wxMemoryStreamBase(data, length, 1)
  58     {}
  59 };
  60
  61 class wxMemoryOutputStream: public wxMemoryStreamBase {
  62   DECLARE_DYNAMIC_CLASS(wxMemoryOutputStream)
  63  public:
  64   wxMemoryOutputStream(char *data = NULL, size_t length = 0)
  65      : wxMemoryStreamBase(data, length, 2)
  66    {}
  67 };
  68
  69 class wxMemoryStream: public wxMemoryStreamBase {
  70   DECLARE_DYNAMIC_CLASS(wxMemoryStream)
  71  public:
  72   wxMemoryStream(char *data = NULL, size_t length = 0)
  73      : wxMemoryStreamBase(data, length, 0)
  74    {}
  75 };
  76
  77 #endif