mirrors/tres
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

tres/ipv4_address: Add a function for network address calculation helper

Browse source
This commit is contained in:
Eishun Kondoh 2018-10-09 14:04:22 +09:00
parent 79fc75ea67
commit 07821494dd
1 changed files with 12 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

12
lib/tres/ipv4_address.ex
View file

@ -27,6 +27,18 @@ defmodule Tres.IPv4Address do
end
end
@doc """
iex> addr = IPv4Address.parse("192.168.10.1/24")
iex> {192, 168, 10, 0} = IPv4Address.to_network(addr)
"""
@spec to_network({in_addr(), in_addr()}) :: in_addr()
def to_network({{a1, a2, a3, a4}, {m1, m2, m3, m4}}) do
addr_int = :binary.decode_unsigned(<<a1, a2, a3, a4>>, :big)
mask_int = :binary.decode_unsigned(<<m1, m2, m3, m4>>, :big)
<<n1, n2, n3, n4>> = <<(addr_int &&& mask_int)::32>>
{n1, n2, n3, n4}
end
@doc """
iex> "192.168.0.1" = IPv4Address.to_str({192, 168, 0, 1})
"""