
[;1m  crc32_combine(FirstCrc, SecondCrc, SecondSize)[0m

  Combines two previously computed crc32 checksums.

  This computation requires the size of the data object for the
  second checksum to be known.

  The following code:

    Y = erlang:crc32(Data1),
    Z = erlang:crc32(Y,Data2).

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

    X = erlang:crc32(Data1),
    Y = erlang:crc32(Data2),
    Z = erlang:crc32_combine(X,Y,iolist_size(Data2)).
