dart:io | Implement FileSystemEntity.typeSync on Windows, to identify symbolic links and junctions.

runtime/bin/file_win.cc

 // Copyright (c) 2012, 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.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/file.h"
 
 #include <fcntl.h>  // NOLINT
@@ skipping 254 matching lines @@
 
 
 File::StdioHandleType File::GetStdioHandleType(int fd) {
   // Treat all stdio handles as pipes. The Windows event handler and
   // socket code will handle the different handle types.
   return kPipe;
 }
 
 
 File::Type File::GetType(const char* pathname, bool follow_links) {
-  return File::kDoesNotExist;
+  const wchar_t* name = StringUtils::Utf8ToWide(pathname);
+  WIN32_FIND_DATAW file_data;
+  HANDLE find_handle = FindFirstFileW(name, &file_data);
+  if (find_handle == INVALID_HANDLE_VALUE) {
+    // TODO(whesse): Distinguish other errors from does not exist.
+    return File::kDoesNotExist;
+  }
+  DWORD attributes = file_data.dwFileAttributes;
+  if (!follow_links && (attributes & FILE_ATTRIBUTE_REPARSE_POINT) != 0) {
+    DWORD reparse_tag = file_data.dwReserved0;
+    if (reparse_tag == IO_REPARSE_TAG_SYMLINK ||
+        reparse_tag == IO_REPARSE_TAG_MOUNT_POINT) {
+      return File::kIsLink;
+    } else {
+      return File::kDoesNotExist;
+    }
+  } else if ((attributes & FILE_ATTRIBUTE_DIRECTORY) != 0) {
+    return File::kIsDirectory;
+  } else {
+    return File::kIsFile;
+  }
 }
 
 #endif  // defined(TARGET_OS_WINDOWS)