dotted-quad support for IPv4 subnet masks

[abraxxa]

I have to work with a product that returns IPv4 networks with the subnet mask in dotted-quad notation and need to parse those.
Can we add support for in- and output of this format without breaking things?

Thanks!

[oschwald]

That seems possible. A PR that did this with appropriate tests and documentation would likely be accepted.

[abraxxa]

I was already able to use use Net::Works::Util::_integer_address_to_string($net->_subnet_integer) for generting the dotted-quad output.
The guesswork in new_from_string is what worries me.

[oschwald]

Yeah, I could see guessing potentially leading to confusion in some cases. I suppose an additional parameter, e.g., dotted_decimal_mask => 1 or something could work.

[abraxxa]

@oschwald Before I start with this pull-request, can you be so kind to look at my fork which uses binary representation instead of integer/Math::Int128?
My goal was to get rid of Math::Int128 as far as I can remember and provide an API for binary values to store those in a SQL database that has no Int128 or IP address/network support (Oracle) using its RAW database which IO is in uppercase hex.
Thanks!

[abraxxa]

I've rebased my fork with my commits from 2014 against current main and called it main, so my original modifications are also viewable in the still existing master branch.

[oschwald]

@abraxxa, sure, do you have a link to what you want me to review?

[abraxxa]

The main branch in my fork please.

[abraxxa]

@oschwald friendly reminder ;-)

[oschwald]

Sorry for the delay. At a high level, most of the changes seem good. It will be easier to review once there is a PR that I can comment on.