[dart:io][windows] Make unicode characters display correctly.

runtime/bin/file.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "bin/file.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
@@ skipping 58 matching lines @@
   intptr_t file_pointer =
       DartUtils::GetIntptrValue(Dart_GetNativeArgument(args, 1));
   File* file = reinterpret_cast<File*>(file_pointer);
   Dart_WeakPersistentHandle handle = Dart_NewWeakPersistentHandle(
       dart_this, reinterpret_cast<void*>(file), sizeof(*file), ReleaseFile);
   file->SetWeakHandle(handle);
   SetFile(dart_this, file_pointer);
 }
 
 
+void FUNCTION_NAME(File_SetTranslation)(Dart_NativeArguments args) {
+  File* file = GetFile(args);
+  ASSERT(file != NULL);
+  intptr_t translation =
+      DartUtils::GetIntptrValue(Dart_GetNativeArgument(args, 1));

[siva, 2017/02/22 00:58:45]

Dart_GetNativeIntegerArgument might work here, just one transition into the VM.

[zra, 2017/02/22 05:07:15]

Done.

+  if ((translation != File::kText) && (translation != File::kBinary)) {
+    Dart_ThrowException(DartUtils::NewDartArgumentError(
+        "The argument must be a FileTranslation mode"));
+  }
+  file->SetTranslation(static_cast<File::DartFileTranslation>(translation));
+}
+
+
 void FUNCTION_NAME(File_Open)(Dart_NativeArguments args) {
   const char* filename =
       DartUtils::GetStringValue(Dart_GetNativeArgument(args, 0));
   int64_t mode = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 1));
   File::DartFileOpenMode dart_file_mode =
       static_cast<File::DartFileOpenMode>(mode);
   File::FileOpenMode file_mode = File::DartModeToFileMode(dart_file_mode);
   // Check that the file exists before opening it only for
   // reading. This is to prevent the opening of directories as
   // files. Directories can be opened for reading using the posix
@@ skipping 1196 matching lines @@
       return CObject::IllegalArgumentError();
     }
   }
   return CObject::IllegalArgumentError();
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // !defined(DART_IO_DISABLED)