src/ResText/codecvt.h

   1
   2 /**     Several code conversions facets.
   3
   4         E.g. this is how to convert UCS-2 to UTF-8
   5
   6         @code
   7         wifstream ifs("input", ios_base::binary);
   8         wofstream ofs("output", ios_base::binary);
   9
  10         ifs.rdbuf()->pubimbue(locale(locale(), new ucs2_conversion()));
  11         ofs.rbbuf()->pubimbue(locale(locale(), new utf8_conversion()));
  12         ofs << ifs.rdbuf();
  13         @endcode
  14
  15         @author Vladimir Prus <ghost@cs.msu.su>
  16
  17         @file
  18 */
  19
  20 #include <locale>
  21 #pragma warning(push)
  22 #pragma warning(disable: 4511)
  23 #pragma warning(disable: 4512)
  24
  25 /**     Conversion facet that allows to use Unicode files in UCS-2 encoding */
  26 class ucs2_conversion
  27 : public std::codecvt<wchar_t, char, std::mbstate_t>
  28 {
  29 protected:
  30
  31         result do_in(std::mbstate_t& state,
  32                                  const char* from, const char* from_end, const char*& from_next,
  33                                  wchar_t* to, wchar_t* to_limit, wchar_t*& to_next) const;
  34
  35         result do_out(std::mbstate_t& state,
  36                                   const wchar_t* from, const wchar_t* from_end, const wchar_t*& from_next,
  37                                   char* to, char* to_limit, char*& to_next) const;
  38
  39     bool do_always_noconv() const throw() { return false; }
  40     int  do_encoding() const throw() { return 2; }
  41 };
  42
  43
  44 /**     Conversion facet that allows to read Unicode files in UTF-8 encoding */
  45 class utf8_conversion
  46 : public std::codecvt<wchar_t, char, std::mbstate_t>
  47 {
  48 protected:
  49
  50         result do_in(std::mbstate_t& state,
  51                                  const char* from, const char* from_end, const char*& from_next,
  52                                  wchar_t* to, wchar_t* to_limit, wchar_t*& to_next) const;
  53
  54         result do_out(std::mbstate_t& state,
  55                                   const wchar_t* from, const wchar_t* from_end, const wchar_t*& from_next,
  56                                   char* to, char* to_limit, char*& to_next) const;
  57
  58     bool do_always_noconv() const throw() { return false; }
  59     int  do_encoding() const throw() { return 2; }
  60 };
  61 #pragma warning(pop)
  62
  63
  64