ZIP Android in Kotlin - Retrofit

main.kt

override fun onResponse(call: Call<ResponseBody>?, response: Response<ResponseBody>?) {
  val etag = headers["Etag"]
  val body = response.body()!!
  val location = App.storageDir(App.Storage.TEMP)
  val zip = File(location, "$etag.zip")

  /*if (!zip.exists()) {
      zip.createNewFile()
  }

  var inputStream: InputStream? = null
  var outputStream: OutputStream? = null

  val fileSize = body.contentLength()
  val fileReader = ByteArray(fileSize.toInt()) //ByteArray(4096)

  var fileSizeDownloaded: Long = 0

  inputStream = body.byteStream()
  outputStream = FileOutputStream(zip)

  while (true) {
      val read = inputStream.read(fileReader)

      if (read == -1) {
          break
      }

      outputStream.write(fileReader, 0, read)
      fileSizeDownloaded += read.toLong()
  }

  outputStream.flush()*/

  //FileInputStream(zip).use { fin ->
      //ZipInputStream(fin).use { zin ->
      ZipInputStream(body.byteStream()).use { zin ->
          var ze: ZipEntry? = zin.nextEntry
          while (ze != null) {
              if(ze.isDirectory) {
                  val f = File(location, ze.name)
                  if(!f.exists()) if(!f.isDirectory) f.mkdirs()
              } else {
                  FileOutputStream(File(location, ze.name)).use { fout ->
                      val buffer = ByteArray(8192)
                      var len = zin.read(buffer)
                      while (len != -1) {
                          fout.write(buffer, 0, len)
                          len = zin.read(buffer)
                      }
                      zin.closeEntry()
                  }

              }

              ze = zin.nextEntry
          }
      }
  //}
}