external_libraries/boost/libs/filesystem/v3/src/windows_file_codecvt.cpp

   1 //  filesystem windows_file_codecvt.cpp  -----------------------------------------//
   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 //--------------------------------------------------------------------------------------//
  11
  12 #include <boost/config.hpp>
  13 #if !defined( BOOST_NO_STD_WSTRING )
  14 // Boost.Filesystem V3 and later requires std::wstring support.
  15 // During the transition to V3, libraries are compiled with both V2 and V3 sources.
  16 // On old compilers that don't support V3 anyhow, we just skip everything so the compile
  17 // will succeed and the library can be built.
  18
  19 // define BOOST_FILESYSTEM_SOURCE so that <boost/system/config.hpp> knows
  20 // the library is being built (possibly exporting rather than importing code)
  21 #define BOOST_FILESYSTEM_SOURCE
  22
  23 #ifndef BOOST_SYSTEM_NO_DEPRECATED
  24 # define BOOST_SYSTEM_NO_DEPRECATED
  25 #endif
  26
  27 #include <boost/filesystem/v3/config.hpp>
  28 #include <cwchar>  // for mbstate_t
  29
  30 #ifdef BOOST_WINDOWS_API
  31
  32 #include "windows_file_codecvt.hpp"
  33
  34 // Versions of MinGW prior to GCC 4.6 requires this
  35 #ifndef WINVER
  36 # define WINVER 0x0500
  37 #endif
  38
  39 #include <windows.h>
  40
  41   std::codecvt_base::result windows_file_codecvt::do_in(
  42     std::mbstate_t &,
  43     const char* from, const char* from_end, const char*& from_next,
  44     wchar_t* to, wchar_t* to_end, wchar_t*& to_next) const
  45   {
  46     UINT codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
  47
  48     int count;
  49     if ((count = ::MultiByteToWideChar(codepage, MB_PRECOMPOSED, from,
  50       from_end - from, to, to_end - to)) == 0)
  51     {
  52       return error;  // conversion failed
  53     }
  54
  55     from_next = from_end;
  56     to_next = to + count;
  57     *to_next = L'\0';
  58     return ok;
  59  }
  60
  61   std::codecvt_base::result windows_file_codecvt::do_out(
  62     std::mbstate_t &,
  63     const wchar_t* from, const wchar_t* from_end, const wchar_t*  & from_next,
  64     char* to, char* to_end, char* & to_next) const
  65   {
  66     UINT codepage = AreFileApisANSI() ? CP_ACP : CP_OEMCP;
  67
  68     int count;
  69     if ((count = ::WideCharToMultiByte(codepage, WC_NO_BEST_FIT_CHARS, from,
  70       from_end - from, to, to_end - to, 0, 0)) == 0)
  71     {
  72       return error;  // conversion failed
  73     }
  74
  75     from_next = from_end;
  76     to_next = to + count;
  77     *to_next = '\0';
  78     return ok;
  79   }
  80
  81   # endif  // BOOST_WINDOWS_API
  82
  83 #endif  // no wide character support