# Pastebin lUFptCxp
```
class BinaryFileDataSource is Iterator[Array[U8] val]
  let _file: File
  let _msg_size: USize

  new iso create(path: FilePath val, msg_size: USize) =>
    _file = File(path)
    _msg_size = msg_size

  fun ref has_next(): Bool =>
    if _file.position() < _file.size() then
      true
    else
      false
    end

  fun ref next(): Array[U8] val =>
    _file.read(_msg_size)
```