Fix `Digest::CRC16DNP #40
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- Set `XOR_MASK` instead of flipping bits in `Digest::CRC16DNP#finish`.
- `Digest::CRC16DNP#update` does a right bit shift in `lib/digest/crc16_dnp.rb`.
However, the C implementation did a left bit shift.
For reference, CRC-16/DNP seems to input bits in reverse order (lower bits).
https://reveng.sourceforge.io/crc-catalogue/16.htm#crc.cat.crc-16-dnp
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XOR_MASKinstead of flipping bits inDigest::CRC16DNP#finish.Digest::CRC16DNP#updatedoes a right bit shift inlib/digest/crc16_dnp.rb.However, the C implementation did a left bit shift.
For reference, CRC-16/DNP seems to input bits in reverse order (lower bits).
https://reveng.sourceforge.io/crc-catalogue/16.htm#crc.cat.crc-16-dnp