  constructor (p, opt) {
    opt = opt || {}
    super(opt)
    if (typeof p !== 'string')
      throw new TypeError('path is required')
    this.path = p
    // suppress atime, ctime, uid, gid, uname, gname
    this.portable = !!opt.portable
    // until node has builtin pwnam functions, this'll have to do
    this.myuid = process.getuid && process.getuid()
    this.myuser = process.env.USER || ''
    this.maxReadSize = opt.maxReadSize || maxReadSize
    this.linkCache = opt.linkCache || new Map()
    this.statCache = opt.statCache || new Map()
    this.preservePaths = !!opt.preservePaths
    this.cwd = opt.cwd || process.cwd()
    this.strict = !!opt.strict
    this.noPax = !!opt.noPax
    this.noMtime = !!opt.noMtime
    this.mtime = opt.mtime || null

    if (typeof opt.onwarn === 'function')
      this.on('warn', opt.onwarn)

    let pathWarn = false
    if (!this.preservePaths && path.win32.isAbsolute(p)) {
      // absolutes on posix are also absolutes on win32
      // so we only need to test this one to get both
      const parsed = path.win32.parse(p)
      this.path = p.substr(parsed.root.length)
      pathWarn = parsed.root
    }

    this.win32 = !!opt.win32 || process.platform === 'win32'
    if (this.win32) {
      this.path = winchars.decode(this.path.replace(/\\/g, '/'))
      p = p.replace(/\\/g, '/')
    }

    this.absolute = opt.absolute || path.resolve(this.cwd, p)

    if (this.path === '')
      this.path = './'

    if (pathWarn) {
      this.warn('TAR_ENTRY_INFO', `stripping ${pathWarn} from absolute path`, {
        entry: this,
        path: pathWarn + this.path,
      })
    }

    if (this.statCache.has(this.absolute))
      this[ONLSTAT](this.statCache.get(this.absolute))
    else
      this[LSTAT]()
  }
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.