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