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 // Copyright:   (c) Guilhem Lavaux
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_WXMMSTREAM_H__
  12 #define _WX_WXMMSTREAM_H__
  13
  14 #include "wx/defs.h"
  15
  16 #if wxUSE_STREAMS
  17
  18 #include "wx/stream.h"
  19
  20 class WXDLLIMPEXP_FWD_BASE wxMemoryOutputStream;
  21
  22 class WXDLLIMPEXP_BASE wxMemoryInputStream : public wxInputStream
  23 {
  24 public:
  25     wxMemoryInputStream(const void *data, size_t length);
  26     wxMemoryInputStream(const wxMemoryOutputStream& stream);
  27     wxMemoryInputStream(wxInputStream& stream,
  28                         wxFileOffset lenFile = wxInvalidOffset)
  29     {
  30         InitFromStream(stream, lenFile);
  31     }
  32     wxMemoryInputStream(wxMemoryInputStream& stream)
  33         : wxInputStream()
  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_ABSTRACT_CLASS(wxMemoryInputStream)
  67     wxDECLARE_NO_ASSIGN_CLASS(wxMemoryInputStream);
  68 };
  69
  70 class WXDLLIMPEXP_BASE wxMemoryOutputStream : public wxOutputStream
  71 {
  72 public:
  73     // if data is !NULL it must be allocated with malloc()
  74     wxMemoryOutputStream(void *data = NULL, size_t length = 0);
  75     virtual ~wxMemoryOutputStream();
  76     virtual wxFileOffset GetLength() const { return m_o_streambuf->GetLastAccess(); }
  77     virtual bool IsSeekable() const { return true; }
  78
  79     size_t CopyTo(void *buffer, size_t len) const;
  80
  81     wxStreamBuffer *GetOutputStreamBuffer() const { return m_o_streambuf; }
  82
  83 #if WXWIN_COMPATIBILITY_2_6
  84     // deprecated, compatibility only
  85     wxDEPRECATED( wxStreamBuffer *OutputStreamBuffer() const );
  86 #endif // WXWIN_COMPATIBILITY_2_6
  87
  88 protected:
  89     wxStreamBuffer *m_o_streambuf;
  90
  91 protected:
  92     size_t OnSysWrite(const void *buffer, size_t nbytes);
  93     wxFileOffset OnSysSeek(wxFileOffset pos, wxSeekMode mode);
  94     wxFileOffset OnSysTell() const;
  95
  96     DECLARE_DYNAMIC_CLASS(wxMemoryOutputStream)
  97     wxDECLARE_NO_COPY_CLASS(wxMemoryOutputStream);
  98 };
  99
 100 #if WXWIN_COMPATIBILITY_2_6
 101     inline wxStreamBuffer *wxMemoryInputStream::InputStreamBuffer() const { return m_i_streambuf; }
 102     inline wxStreamBuffer *wxMemoryOutputStream::OutputStreamBuffer() const { return m_o_streambuf; }
 103 #endif // WXWIN_COMPATIBILITY_2_6
 104
 105 #endif
 106   // wxUSE_STREAMS
 107
 108 #endif
 109   // _WX_WXMMSTREAM_H__