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local core = require 'inet.core'
local is_inet = core.is_inet
local insert = table.insert
local remove = table.remove
local sort = table.sort
local M = {}
local function table_compact(t, n)
-- remove nil entries, and reorder
local i = 0
for j=1,n do
if t[j] then
if i > 0 then
t[i] = t[j]
i = i + 1
end
elseif i == 0 then
i = j
end
end
if i > 0 then
for j=i,n do
t[j] = nil
end
end
end
function M.aggregate(t)
local flag = true
local n = #t
for i=1,n do
t[i] = t[i]:network()
end
while flag do -- loop until no aggregatable addresses are found
flag = false
for i=1,n do
local ia = t[i]
if ia then
local ib = ia:flip() -- counterpart
for j=1,n do
if j ~= i then
if ia == t[j] then
-- duplicate found
t[j] = nil
flag = true
elseif t[j] == ib then
-- counterpart found, aggregating
t[i] = (ia ^ -1):network()
t[j] = nil
flag = true
end
end
end
end
end
end
table_compact(t, n)
end
local function has(set, addr)
assert(set)
for i=1,#set do
local elem = set[i]
if elem >= addr then
local exclude = set.exclude
if exclude then
return not has(exclude, addr)
else
return true
end
end
end
return false
end
function M.iterator(set)
local excl = set.exclude
local i = 1
if #set < 1 then return nil, 'empty set' end
local addr = set[i]
local net = set[i]:network()
local function iter()
if not addr then return end
local ret
ret = addr/32
addr = addr + 1
if addr:network() ~= net then
i = i + 1
addr = set[i]
if addr then
net = set[i]:network()
end
end
if has(excl, ret) then
return iter()
end
return ret
end
return iter
end
-- iterate over the set repeatedly
function M.loopiterator(set)
local orig_iter = M.iterator(set)
local function iter()
local addr = orig_iter()
if not addr then
orig_iter = M.iterator(set)
addr = orig_iter()
end
return addr
end
return iter
end
local inet_set = {}
inet_set.__index = inet_set
local function check_net(self, net)
if not is_inet(net) then return nil, 'invalid net' end
local set_fam = self.family
local net_fam = net:family()
if set_fam then
if set_fam ~= net_fam then
return nil, 'invalid family'
end
else
self.family = net_fam
end
return true
end
function inet_set:add(net)--, aggregate)
if not check_net(self, net) then return check_net(self, net) end
insert(self.nets, net)
M.aggregate(self.nets)
return true
end
function inet_set:remove(net)
if not check_net(self, net) then return check_net(self, net) end
local nets = self.nets
local ret = false
for i=1,#nets do
local n = nets[i]
if n == net then
ret = true
remove(nets, i)
elseif n:contains(net) then
ret = true
remove(nets, i)
for j=#n+1,#net do
local sn = (net / j):network()
if sn:contains(net) then
sn = sn:flip()
end
self:add(sn)
end
end
end
return ret
end
function inet_set:contains(net)
if not check_net(self, net) then return check_net(self, net) end
local nets = self.nets
for i=1,#nets do
local n = nets[i]
if n == net or n:contains(net) then
return true
end
end
return false
end
function inet_set:list()
local nets = self.nets
sort(nets)
return nets
end
function inet_set:flush()
self.nets = {}
self.family = nil
return true
end
local function new_set()
return setmetatable({
nets = {},
}, inet_set)
end
M.new = new_set
return M
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