    private static boolean isSlash(byte b) {
        switch (b) {
            case '/':
            case '\\':
                return true;
            default:
                return false;
        }
    }
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.