Github user bodewig commented on the issue:
https://github.com/apache/commons-compress/pull/17
Great, many thanks,
I've just found
https://people.freebsd.org/~kientzle/libarchive/man/cpio.5.txt states
> The CRC format is identical to the new ASCII format described in the
previous section except that the magic field is set to ``070702'' and the check
field is set to the sum of all bytes in the file data. This sum is computed
treating all bytes as unsigned values and using unsigned arithmetic. Only the
least-significant 32 bits of the sum are stored.
so your patch is certainly correct.
I'm afraid we've got the same bug when writing CPIO archives. I'll take
care of it.
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