
  [;1m-spec erlang:adler32_combine(FirstAdler, SecondAdler, SecondSize) ->[0m
  [;1m                                non_neg_integer()[0m
  [;1m                                when[0m
  [;1m                                    FirstAdler :: non_neg_integer(),[0m
  [;1m                                    SecondAdler :: non_neg_integer(),[0m
  [;1m                                    SecondSize :: non_neg_integer().[0m

  Combines two previously computed adler32 checksums. This
  computation requires the size of the data object for the second
  checksum to be known.

  The following code:

    Y = erlang:adler32(Data1),
    Z = erlang:adler32(Y,Data2).

  assigns the same value to [;;4mZ[0m as this:

    X = erlang:adler32(Data1),
    Y = erlang:adler32(Data2),
    Z = erlang:adler32_combine(X,Y,iolist_size(Data2)).
