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