Update charted to 0.4.8 and roll

packages/which/lib/src/has_permission.dart

-
-/// See http://dartbug.com/22036
-library which.src.has_permission;
-
-class FilePermission {
-
-  final int index;
-  final String _name;
-
-  const FilePermission._(this.index, this._name);
-
-  static const EXECUTE = const FilePermission._(0, 'EXECUTE');
-  static const WRITE = const FilePermission._(1, 'WRITE');
-  static const READ = const FilePermission._(2, 'READ');
-  static const SET_UID = const FilePermission._(3, 'SET_UID');
-  static const SET_GID = const FilePermission._(4, 'SET_GID');
-  static const STICKY = const FilePermission._(5, 'STICKY');
-
-  static const List<FilePermission> values = const [EXECUTE, WRITE, READ, SET_UID, SET_GID, STICKY];
-
-  String toString() => 'FilePermission.$_name';
-}
-
-class FilePermissionRole {
-
-  final int index;
-  final String _name;
-
-  const FilePermissionRole._(this.index, this._name);
-
-  static const WORLD = const FilePermissionRole._(0, 'WORLD');
-  static const GROUP = const FilePermissionRole._(1, 'GROUP');
-  static const OWNER = const FilePermissionRole._(2, 'OWNER');
-
-  static const List<FilePermissionRole> values = const [WORLD, GROUP, OWNER];
-
-  String toString() => 'FilePermissionRole.$_name';
-}
-
-bool hasPermission(int fileStatMode, FilePermission permission, {FilePermissionRole role: FilePermissionRole.WORLD}) {
-  var bitIndex = _getPermissionBitIndex(permission, role);
-  return (fileStatMode & (1 << bitIndex)) != 0;
-}
-
-int _getPermissionBitIndex(FilePermission permission, FilePermissionRole role) {
-  switch (permission) {
-    case FilePermission.SET_UID: return 11;
-    case FilePermission.SET_GID: return 10;
-    case FilePermission.STICKY: return 9;
-    default: return (role.index * 3) + permission.index;
-  }
-}