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stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode > Class Template Reference
Inheritance diagram for stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >:

Public Types

typedef _STD codecvt< _Elem, char, _Statype > _Mybase
 
typedef _Mybase::result result
 
typedef char _Byte
 
typedef _Elem intern_type
 
typedef _Byte extern_type
 
typedef _Statype state_type
 

Public Member Functions

 codecvt_utf8 (size_t _Refs=0)
 
virtual ~codecvt_utf8 () _NOEXCEPT
 

Protected Member Functions

virtual result do_in (_Statype &_State, const _Byte *_First1, const _Byte *_Last1, const _Byte *&_Mid1, _Elem *_First2, _Elem *_Last2, _Elem *&_Mid2) const
 
virtual result do_out (_Statype &_State, const _Elem *_First1, const _Elem *_Last1, const _Elem *&_Mid1, _Byte *_First2, _Byte *_Last2, _Byte *&_Mid2) const
 
virtual result do_unshift (_Statype &, _Byte *_First2, _Byte *, _Byte *&_Mid2) const
 
virtual int do_length (_Statype &_State, const _Byte *_First1, const _Byte *_Last1, size_t _Count) const _THROW0()
 
virtual bool do_always_noconv () const _THROW0()
 
virtual int do_max_length () const _THROW0()
 
virtual int do_encoding () const _THROW0()
 

Member Typedef Documentation

template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
typedef char stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::_Byte
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
typedef _STD codecvt<_Elem, char, _Statype> stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::_Mybase
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
typedef _Byte stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::extern_type
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
typedef _Elem stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::intern_type
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
typedef _Mybase::result stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::result
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
typedef _Statype stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::state_type

Constructor & Destructor Documentation

template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::codecvt_utf8 ( size_t  _Refs = 0)
inlineexplicit
39  : _Mybase(_Refs)
40  { // construct with ref count
41  }
stdext::cvt::codecvt_utf8::_Mybase
_STD codecvt< _Elem, char, _Statype > _Mybase
Definition: utf8:31
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
virtual stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::~codecvt_utf8 ( )
inlinevirtual
44  { // destroy the object
45  }

Member Function Documentation

template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
virtual bool stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::do_always_noconv ( ) const
inlineprotectedvirtual
210  { // return true if conversions never change input
211  return (false);
212  }
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
virtual int stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::do_encoding ( ) const
inlineprotectedvirtual
221  { // return length of code sequence (from codecvt)
222  return ((_Mode & (_STD consume_header | _STD generate_header)) != 0
223  ? -1 : 0); // -1 => state dependent, 0 => varying length
224  }
generate_header
Definition: codecvt:23
consume_header
Definition: codecvt:22
_STD
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
virtual result stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::do_in ( _Statype &  _State,
const _Byte *  _First1,
const _Byte *  _Last1,
const _Byte *&  _Mid1,
_Elem *  _First2,
_Elem *  _Last2,
_Elem *&  _Mid2 
) const
inlineprotectedvirtual
51  { // convert bytes [_First1, _Last1) to [_First2, _Last)
52  char *_Pstate = (char *)&_State;
53  _Mid1 = _First1;
54  _Mid2 = _First2;
55 
56  for (; _Mid1 != _Last1 && _Mid2 != _Last2; )
57  { // convert a multibyte sequence
58  unsigned char _By = (unsigned char)*_Mid1;
59  unsigned long _Ch;
60  int _Nextra;
61 
62  if (_By < 0x80)
63  _Ch = _By, _Nextra = 0;
64  else if (_By < 0xc0)
65  { // 0x80-0xdf not first byte
66  ++_Mid1;
67  return (_Mybase::error);
68  }
69  else if (_By < 0xe0)
70  _Ch = _By & 0x1f, _Nextra = 1;
71  else if (_By < 0xf0)
72  _Ch = _By & 0x0f, _Nextra = 2;
73  else if (_By < 0xf8)
74  _Ch = _By & 0x07, _Nextra = 3;
75  else
76  _Ch = _By & 0x03, _Nextra = _By < 0xfc ? 4 : 5;
77 
78  if (_Nextra == 0)
79  ++_Mid1;
80  else if (_Last1 - _Mid1 < _Nextra + 1)
81  break; // not enough input
82  else
83  for (++_Mid1; 0 < _Nextra; --_Nextra, ++_Mid1)
84  if ((_By = (unsigned char)*_Mid1) < 0x80 || 0xc0 <= _By)
85  return (_Mybase::error); // not continuation byte
86  else
87  _Ch = _Ch << 6 | (_By & 0x3f);
88 
89  if (*_Pstate == 0)
90  { // first time, maybe look for and consume header
91  *_Pstate = 1;
92 
93  if ((_Mode & _STD consume_header) != 0 && _Ch == 0xfeff)
94  { // drop header and retry
95  result _Ans = do_in(_State, _Mid1, _Last1, _Mid1,
96  _First2, _Last2, _Mid2);
97 
98  if (_Ans == _Mybase::partial)
99  { // roll back header determination
100  *_Pstate = 0;
101  _Mid1 = _First1;
102  }
103  return (_Ans);
104  }
105  }
106 
107  if (_Maxcode < _Ch)
108  return (_Mybase::error); // code too large
109  *_Mid2++ = (_Elem)_Ch;
110  }
111 
112  return (_First1 == _Mid1 ? _Mybase::partial : _Mybase::ok);
113  }
stdext::cvt::codecvt_utf8::result
_Mybase::result result
Definition: utf8:32
consume_header
Definition: codecvt:22
_Ch
_Check_return_ _In_ wchar_t _Ch
Definition: vcruntime_string.h:89
stdext::cvt::codecvt_utf8::do_in
virtual result do_in(_Statype &_State, const _Byte *_First1, const _Byte *_Last1, const _Byte *&_Mid1, _Elem *_First2, _Elem *_Last2, _Elem *&_Mid2) const
Definition: utf8:48
_STD
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
virtual int stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::do_length ( _Statype &  _State,
const _Byte *  _First1,
const _Byte *  _Last1,
size_t  _Count 
) const
inlineprotectedvirtual
179  { // return min(_Count, converted length of bytes [_First1, _Last1))
180  size_t _Wchars = 0;
181  _Statype _Mystate = _State;
182 
183  for (; _Wchars < _Count && _First1 != _Last1; )
184  { // convert another wide character
185  const _Byte *_Mid1;
186  _Elem *_Mid2;
187  _Elem _Ch;
188 
189  switch (do_in(_Mystate, _First1, _Last1, _Mid1,
190  &_Ch, &_Ch + 1, _Mid2))
191  { // test result of single wide-char conversion
192  case _Mybase::noconv:
193  return ((int)(_Wchars + (_Last1 - _First1)));
194 
195  case _Mybase::ok:
196  if (_Mid2 == &_Ch + 1)
197  ++_Wchars; // replacement do_in might not convert one
198  _First1 = _Mid1;
199  break;
200 
201  default:
202  return ((int)_Wchars); // error or partial
203  }
204  }
205 
206  return ((int)_Wchars);
207  }
_Count
unsigned int _Count
Definition: xcomplex:668
stdext::cvt::codecvt_utf8::_Byte
char _Byte
Definition: utf8:33
_Ch
_Check_return_ _In_ wchar_t _Ch
Definition: vcruntime_string.h:89
stdext::cvt::codecvt_utf8::do_in
virtual result do_in(_Statype &_State, const _Byte *_First1, const _Byte *_Last1, const _Byte *&_Mid1, _Elem *_First2, _Elem *_Last2, _Elem *&_Mid2) const
Definition: utf8:48
_Statype
_CSTD mbstate_t _Statype
Definition: codecvt:26
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
virtual int stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::do_max_length ( ) const
inlineprotectedvirtual
215  { // return maximum length required for a conversion
216  return ((_Mode & (_STD consume_header | _STD generate_header)) != 0
217  ? 9 : 6);
218  }
generate_header
Definition: codecvt:23
consume_header
Definition: codecvt:22
_STD
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
virtual result stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::do_out ( _Statype &  _State,
const _Elem *  _First1,
const _Elem *  _Last1,
const _Elem *&  _Mid1,
_Byte *  _First2,
_Byte *  _Last2,
_Byte *&  _Mid2 
) const
inlineprotectedvirtual
118  { // convert [_First1, _Last1) to bytes [_First2, _Last)
119  char *_Pstate = (char *)&_State;
120  _Mid1 = _First1;
121  _Mid2 = _First2;
122 
123  for (; _Mid1 != _Last1 && _Mid2 != _Last2; )
124  { // convert and put a wide char
125  _Byte _By;
126  int _Nextra;
127  unsigned long _Ch = (unsigned long)*_Mid1;
128 
129  if (_Maxcode < _Ch)
130  return (_Mybase::error);
131 
132  if (_Ch < 0x0080)
133  _By = (_Byte)_Ch, _Nextra = 0;
134  else if (_Ch < 0x0800)
135  _By = (_Byte)(0xc0 | _Ch >> 6), _Nextra = 1;
136  else if (_Ch < 0x00010000)
137  _By = (_Byte)(0xe0 | _Ch >> 12), _Nextra = 2;
138  else if (_Ch < 0x00200000)
139  _By = (_Byte)(0xf0 | _Ch >> 18), _Nextra = 3;
140  else if (_Ch < 0x04000000)
141  _By = (_Byte)(0xf8 | _Ch >> 24), _Nextra = 4;
142  else
143  _By = (_Byte)(0xfc | (_Ch >> 30 & 0x03)), _Nextra = 5;
144 
145  if (*_Pstate == 0)
146  { // first time, maybe generate header
147  *_Pstate = 1;
148  if ((_Mode & _STD generate_header) == 0)
149  ;
150  else if (_Last2 - _Mid2 < 3 + 1 + _Nextra)
151  return (_Mybase::partial); // not enough room for both
152  else
153  { // prepend header
154  *_Mid2++ = (_Byte)(unsigned char)0xef;
155  *_Mid2++ = (_Byte)(unsigned char)0xbb;
156  *_Mid2++ = (_Byte)(unsigned char)0xbf;
157  }
158  }
159 
160  if (_Last2 - _Mid2 < 1 + _Nextra)
161  break; // not enough room for output
162 
163  ++_Mid1;
164  for (*_Mid2++ = _By; 0 < _Nextra; )
165  *_Mid2++ = (_Byte)((_Ch >> 6 * --_Nextra & 0x3f) | 0x80);
166  }
167  return (_First1 == _Mid1 ? _Mybase::partial : _Mybase::ok);
168  }
generate_header
Definition: codecvt:23
stdext::cvt::codecvt_utf8::_Byte
char _Byte
Definition: utf8:33
_Ch
_Check_return_ _In_ wchar_t _Ch
Definition: vcruntime_string.h:89
_STD
template<class _Elem , unsigned long _Maxcode = 0xffffffff, _STD codecvt_mode _Mode = (_STD codecvt_mode)0>
virtual result stdext::cvt::codecvt_utf8< _Elem, _Maxcode, _Mode >::do_unshift ( _Statype &  ,
_Byte *  _First2,
_Byte *  ,
_Byte *&  _Mid2 
) const
inlineprotectedvirtual
172  { // generate bytes to return to default shift state
173  _Mid2 = _First2;
174  return (_Mybase::ok);
175  }
The documentation for this class was generated from the following file:
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