include/wx/mstream.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/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
  12 #ifndef _WX_WXMMSTREAM_H__
  13 #define _WX_WXMMSTREAM_H__
  14
  15 #include "wx/defs.h"
  16
  17 #if wxUSE_STREAMS
  18
  19 #include "wx/stream.h"
  20
  21 class WXDLLIMPEXP_BASE wxMemoryOutputStream;
  22
  23 class WXDLLIMPEXP_BASE wxMemoryInputStream : public wxInputStream
  24 {
  25 public:
  26     wxMemoryInputStream(const void *data, size_t length);
  27     wxMemoryInputStream(const wxMemoryOutputStream& stream);
  28     wxMemoryInputStream(wxInputStream& stream,
  29                         wxFileOffset lenFile = wxInvalidOffset)
  30     {
  31         InitFromStream(stream, lenFile);
  32     }
  33     wxMemoryInputStream(wxMemoryInputStream& stream)
  34     {
  35         InitFromStream(stream, wxInvalidOffset);
  36     }
  37
  38     virtual ~wxMemoryInputStream();
  39     virtual wxFileOffset GetLength() const { return m_length; }
  40     virtual bool IsSeekable() const { return true; }
  41
  42     virtual char Peek();
  43     virtual bool CanRead() const;
  44
  45     wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
  46
  47 #if WXWIN_COMPATIBILITY_2_6
  48     // deprecated, compatibility only
  49     wxDEPRECATED( wxStreamBuffer *InputStreamBuffer() const );
  50 #endif // WXWIN_COMPATIBILITY_2_6
  51
  52 protected:
  53     wxStreamBuffer *m_i_streambuf;
  54
  55     size_t OnSysRead(void *buffer, size_t nbytes);
  56     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  57     wxFileOffset OnSysTell() const;
  58
  59 private:
  60     // common part of ctors taking wxInputStream
  61     void InitFromStream(wxInputStream& stream, wxFileOffset lenFile);
  62
  63     size_t m_length;
  64
  65     // copy ctor is implemented above: it copies the other stream in this one
  66     DECLARE_NO_ASSIGN_CLASS(wxMemoryInputStream)
  67 };
  68
  69 class WXDLLIMPEXP_BASE wxMemoryOutputStream : public wxOutputStream
  70 {
  71 public:
  72     // if data is !NULL it must be allocated with malloc()
  73     wxMemoryOutputStream(void *data = NULL, size_t length = 0);
  74     virtual ~wxMemoryOutputStream();
  75     virtual wxFileOffset GetLength() const { return m_o_streambuf->GetLastAccess(); }
  76     virtual bool IsSeekable() const { return true; }
  77
  78     size_t CopyTo(void *buffer, size_t len) const;
  79
  80     wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
  81
  82 #if WXWIN_COMPATIBILITY_2_6
  83     // deprecated, compatibility only
  84     wxDEPRECATED( wxStreamBuffer *OutputStreamBuffer() const );
  85 #endif // WXWIN_COMPATIBILITY_2_6
  86
  87 protected:
  88     wxStreamBuffer *m_o_streambuf;
  89
  90 protected:
  91     size_t OnSysWrite(const void *buffer, size_t nbytes);
  92     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  93     wxFileOffset OnSysTell() const;
  94
  95     DECLARE_NO_COPY_CLASS(wxMemoryOutputStream)
  96 };
  97
  98 #if WXWIN_COMPATIBILITY_2_6
  99     inline wxStreamBuffer *wxMemoryInputStream::InputStreamBuffer() const { return m_i_streambuf; }
 100     inline wxStreamBuffer *wxMemoryOutputStream::OutputStreamBuffer() const { return m_o_streambuf; }
 101 #endif // WXWIN_COMPATIBILITY_2_6
 102
 103 #endif
 104   // wxUSE_STREAMS
 105
 106 #endif
 107   // _WX_WXMMSTREAM_H__