feat(): add some configurations

[Allen-saltedfish]

add some configurations.
Crc16:

• CCITT_FALSE
• IBM
• MAXIM
• USB
• X25
• DNP

Crc8:

• ITU
• MAXIM
• ROHC

[Nicoretti]

Hi @sutichunxiao,

Thanks for the PR. As I am currently a bit short on time, it might take me a while to do a full review (go over the configurations etc.). Still, before we merge the PR, we also need to extend the test suite to run a few basic tests for each of the configurations. It would be great if you could add those. The tests for the other configurations should provide sufficient examples, if not, please let me know.

Best,
Nico

[Allen-saltedfish]

Dear Nico,

Thanks for your reply, I push new commit which extends test suite for new configuration. And I found some of my configuration are Repeated. Because Some configurations have aliases. I also add alias for them.

BR,
Su

[Nicoretti]

@Allen-saltedfish thanks for updating the PR. I will review it over the weekend and see if I can do a release afterwards.

[Nicoretti]

Hi @Allen-saltedfish,

As you might have seen, I have removed all of your alias doc strings. Let me give you some context why this was done.

Not all "CRC Names" indicate a very specific configuration. Sometimes there is "wiggle room", e.g. as in the case of CCITT. For example, see this comment.

Therefore, the preferred solution for adding exact aliases in the future would be to remove the unique constraint and simply add a configuration or a named reference to the set of CRC configurations.

e.g.:

class Crc16(enum.Enum):
    XMODEM = Configuration(
        width=16,
        polynomial=0x1021,
        init_value=0x0000,
        final_xor_value=0x0000,
        reverse_input=False,
        reverse_output=False,
    )

    ALIAS = XMODEM

Best,
Nico