z_stream

type z_stream = record

  next_in: pBytef;

  avail_in: uInt;

  total_in: uLong;

  next_out: pBytef;

  avail_out: uInt;

  total_out: uLong;

  msg: string;

  state: pInternal_state;

  zalloc: alloc_func;

  zfree: free_func;

  opaque: voidpf;

  data_type: int;

  adler: uLong;

  reserved: uLong;

end;