import labcomm

class StreamReader:

    def __init__(self, stream):
        self.stream = stream
        pass

    def start(self, decoder, version):
        self.version = version;
        if labcomm.LabComm.sendVersionString(version):
          other_version = decoder.decode_string()
          if version != other_version:
              raise Exception("LabComm version mismatch %s != %s" %
                              (version, other_version))
          pass
        pass

    def read(self, count):
        result = self.stream.read(count)
        if len(result) == 0:
            raise EOFError()
        return result

    def mark(self, value, decl):
        pass
        
    pass