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     char Peek();
  43
  44     wxStreamBuffer *GetInputStreamBuffer() const { return m_i_streambuf; }
  45
  46 #if WXWIN_COMPATIBILITY_2_6
  47     // deprecated, compatibility only
  48     wxDEPRECATED( wxStreamBuffer *InputStreamBuffer() const );
  49 #endif // WXWIN_COMPATIBILITY_2_6
  50
  51 protected:
  52     wxStreamBuffer *m_i_streambuf;
  53
  54     size_t OnSysRead(void *buffer, size_t nbytes);
  55     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  56     wxFileOffset OnSysTell() const;
  57
  58 private:
  59     // common part of ctors taking wxInputStream
  60     void InitFromStream(wxInputStream& stream, wxFileOffset lenFile);
  61
  62     size_t m_length;
  63
  64     // copy ctor is implemented above: it copies the other stream in this one
  65     DECLARE_NO_ASSIGN_CLASS(wxMemoryInputStream)
  66 };
  67
  68 class WXDLLIMPEXP_BASE wxMemoryOutputStream : public wxOutputStream
  69 {
  70 public:
  71     // if data is !NULL it must be allocated with malloc()
  72     wxMemoryOutputStream(void *data = NULL, size_t length = 0);
  73     virtual ~wxMemoryOutputStream();
  74     virtual wxFileOffset GetLength() const { return m_o_streambuf->GetLastAccess(); }
  75     virtual bool IsSeekable() const { return true; }
  76
  77     size_t CopyTo(void *buffer, size_t len) const;
  78
  79     wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
  80
  81 #if WXWIN_COMPATIBILITY_2_6
  82     // deprecated, compatibility only
  83     wxDEPRECATED( wxStreamBuffer *OutputStreamBuffer() const );
  84 #endif // WXWIN_COMPATIBILITY_2_6
  85
  86 protected:
  87     wxStreamBuffer *m_o_streambuf;
  88
  89 protected:
  90     size_t OnSysWrite(const void *buffer, size_t nbytes);
  91     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  92     wxFileOffset OnSysTell() const;
  93
  94     DECLARE_NO_COPY_CLASS(wxMemoryOutputStream)
  95 };
  96
  97 #if WXWIN_COMPATIBILITY_2_6
  98     inline wxStreamBuffer *wxMemoryInputStream::InputStreamBuffer() const { return m_i_streambuf; }
  99     inline wxStreamBuffer *wxMemoryOutputStream::OutputStreamBuffer() const { return m_o_streambuf; }
 100 #endif // WXWIN_COMPATIBILITY_2_6
 101
 102 #endif
 103   // wxUSE_STREAMS
 104
 105 #endif
 106   // _WX_WXMMSTREAM_H__