include/wx/stdstream.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/stdstream.h
   3 // Purpose:     Header of std::istream and std::ostream derived wrappers for
   4 //              wxInputStream and wxOutputStream
   5 // Author:      Jonathan Liu <net147@gmail.com>
   6 // Created:     2009-05-02
   7 // Copyright:   (c) 2009 Jonathan Liu
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_STDSTREAM_H_
  12 #define _WX_STDSTREAM_H_
  13
  14 #include "wx/defs.h"    // wxUSE_STD_IOSTREAM
  15
  16 #if wxUSE_STREAMS && wxUSE_STD_IOSTREAM
  17
  18 #include "wx/defs.h"
  19 #include "wx/stream.h"
  20 #include "wx/ioswrap.h"
  21
  22 // ==========================================================================
  23 // wxStdInputStreamBuffer
  24 // ==========================================================================
  25
  26 class WXDLLIMPEXP_BASE wxStdInputStreamBuffer : public std::streambuf
  27 {
  28 public:
  29     wxStdInputStreamBuffer(wxInputStream& stream);
  30     virtual ~wxStdInputStreamBuffer() { }
  31
  32 protected:
  33     virtual std::streambuf *setbuf(char *s, std::streamsize n);
  34     virtual std::streampos seekoff(std::streamoff off,
  35                                    std::ios_base::seekdir way,
  36                                    std::ios_base::openmode which =
  37                                        std::ios_base::in |
  38                                        std::ios_base::out);
  39     virtual std::streampos seekpos(std::streampos sp,
  40                                    std::ios_base::openmode which =
  41                                        std::ios_base::in |
  42                                        std::ios_base::out);
  43     virtual std::streamsize showmanyc();
  44     virtual std::streamsize xsgetn(char *s, std::streamsize n);
  45     virtual int underflow();
  46     virtual int uflow();
  47     virtual int pbackfail(int c = EOF);
  48
  49     // Special work around for VC8/9 (this bug was fixed in VC10 and later):
  50     // these versions have non-standard _Xsgetn_s() that it being called from
  51     // the stream code instead of xsgetn() and so our overridden implementation
  52     // never actually gets used. To work around this, forward to it explicitly.
  53 #if defined(__VISUALC8__) || defined(__VISUALC9__)
  54     virtual std::streamsize
  55     _Xsgetn_s(char *s, size_t WXUNUSED(size), std::streamsize n)
  56     {
  57         return xsgetn(s, n);
  58     }
  59 #endif // VC8 or VC9
  60
  61     wxInputStream& m_stream;
  62     int m_lastChar;
  63 };
  64
  65 // ==========================================================================
  66 // wxStdInputStream
  67 // ==========================================================================
  68
  69 class WXDLLIMPEXP_BASE wxStdInputStream : public std::istream
  70 {
  71 public:
  72     wxStdInputStream(wxInputStream& stream);
  73     virtual ~wxStdInputStream() { }
  74
  75 protected:
  76     wxStdInputStreamBuffer m_streamBuffer;
  77 };
  78
  79 // ==========================================================================
  80 // wxStdOutputStreamBuffer
  81 // ==========================================================================
  82
  83 class WXDLLIMPEXP_BASE wxStdOutputStreamBuffer : public std::streambuf
  84 {
  85 public:
  86     wxStdOutputStreamBuffer(wxOutputStream& stream);
  87     virtual ~wxStdOutputStreamBuffer() { }
  88
  89 protected:
  90     virtual std::streambuf *setbuf(char *s, std::streamsize n);
  91     virtual std::streampos seekoff(std::streamoff off,
  92                                    std::ios_base::seekdir way,
  93                                    std::ios_base::openmode which =
  94                                        std::ios_base::in |
  95                                        std::ios_base::out);
  96     virtual std::streampos seekpos(std::streampos sp,
  97                                    std::ios_base::openmode which =
  98                                        std::ios_base::in |
  99                                        std::ios_base::out);
 100     virtual std::streamsize xsputn(const char *s, std::streamsize n);
 101     virtual int overflow(int c);
 102
 103     wxOutputStream& m_stream;
 104 };
 105
 106 // ==========================================================================
 107 // wxStdOutputStream
 108 // ==========================================================================
 109
 110 class WXDLLIMPEXP_BASE wxStdOutputStream : public std::ostream
 111 {
 112 public:
 113     wxStdOutputStream(wxOutputStream& stream);
 114     virtual ~wxStdOutputStream() { }
 115
 116 protected:
 117     wxStdOutputStreamBuffer m_streamBuffer;
 118 };
 119
 120 #endif // wxUSE_STREAMS && wxUSE_STD_IOSTREAM
 121
 122 #endif // _WX_STDSTREAM_H_