ceph/src/boost/libs/filesystem/src/windows_file_codecvt.hpp

   1 //  filesystem windows_file_codecvt.hpp  -----------------------------------------------//
   2
   3 //  Copyright Beman Dawes 2009
   4
   5 //  Distributed under the Boost Software License, Version 1.0.
   6 //  See http://www.boost.org/LICENSE_1_0.txt
   7
   8 //  Library home page: http://www.boost.org/libs/filesystem
   9
  10 #ifndef BOOST_FILESYSTEM3_WIN_FILE_CODECVT_HPP
  11 #define BOOST_FILESYSTEM3_WIN_FILE_CODECVT_HPP
  12
  13 #include <boost/filesystem/config.hpp>
  14 #include <cstddef>
  15 #include <locale>
  16
  17 //------------------------------------------------------------------------------------//
  18 //                                                                                    //
  19 //                          class windows_file_codecvt                                //
  20 //                                                                                    //
  21 //  Warning: partial implementation; even do_in and do_out only partially meet the    //
  22 //  standard library specifications as the "to" buffer must hold the entire result.   //
  23 //                                                                                    //
  24 //------------------------------------------------------------------------------------//
  25
  26 class BOOST_SYMBOL_VISIBLE windows_file_codecvt
  27   : public std::codecvt< wchar_t, char, std::mbstate_t >
  28 {
  29 public:
  30   explicit windows_file_codecvt(std::size_t refs = 0)
  31       : std::codecvt<wchar_t, char, std::mbstate_t>(refs) {}
  32 protected:
  33
  34   virtual bool do_always_noconv() const throw() { return false; }
  35
  36   //  seems safest to assume variable number of characters since we don't
  37   //  actually know what codepage is active
  38   virtual int do_encoding() const throw() { return 0; }
  39
  40   virtual std::codecvt_base::result do_in(std::mbstate_t& state,
  41     const char* from, const char* from_end, const char*& from_next,
  42     wchar_t* to, wchar_t* to_end, wchar_t*& to_next) const;
  43
  44   virtual std::codecvt_base::result do_out(std::mbstate_t & state,
  45     const wchar_t* from, const wchar_t* from_end, const wchar_t*& from_next,
  46     char* to, char* to_end, char*& to_next) const;
  47
  48   virtual std::codecvt_base::result do_unshift(std::mbstate_t&,
  49       char* /*from*/, char* /*to*/, char* & /*next*/) const  { return ok; }
  50
  51   virtual int do_length(std::mbstate_t&,
  52     const char* /*from*/, const char* /*from_end*/, std::size_t /*max*/) const  { return 0; }
  53
  54   virtual int do_max_length() const throw () { return 0; }
  55 };
  56
  57 #endif  // BOOST_FILESYSTEM3_WIN_FILE_CODECVT_HPP