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authorAsbjørn Sloth Tønnesen <ast@2e8.dk>2019-07-19 21:43:02 +0000
committerAsbjørn Sloth Tønnesen <ast@2e8.dk>2019-07-19 21:43:02 +0000
commitd42329c948cafec31250c8cdba028d116a76a709 (patch)
tree309a341171ef2275573c6f472fc746dda3ebbbe3 /lua/inet
parent1d7959d798b367b96cf489d08623647587334821 (diff)
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add inet:bits()
Signed-off-by: Asbjørn Sloth Tønnesen <ast@2e8.dk>
Diffstat (limited to 'lua/inet')
-rw-r--r--lua/inet/core.lua33
1 files changed, 33 insertions, 0 deletions
diff --git a/lua/inet/core.lua b/lua/inet/core.lua
index a91dacd..f1c7c49 100644
--- a/lua/inet/core.lua
+++ b/lua/inet/core.lua
@@ -6,10 +6,12 @@ local format = string.format
local floor = math.floor
local min = math.min
local max = math.max
+local insert = table.insert
local lshift = bit32.lshift
local rshift = bit32.rshift
local band = bit32.band
+local extract = bit32.extract
local replace = bit32.replace
local bxor = bit32.bxor
@@ -403,6 +405,17 @@ function inet4:flip()
return new_inet4(bxor(self.bip, flipbit), mask)
end
+function inet4:bits(n)
+ if type(n) ~= 'number' then return nil, 'n must be a number' end
+ if n < 1 or n > 32 or 32 % n ~= 0 then return nil, 'invalid value for n' end
+ local t = {}
+ local bip = self.bip
+ for i=32-n,0,-n do
+ insert(t, extract(bip, i, n))
+ end
+ return t
+end
+
-- each ipv6 address is stored as eight pieces
-- 1111:2222:3333:4444:5555:6666:7777:8888
-- in the table pcs.
@@ -789,6 +802,26 @@ function inet6:__mul(n)
return new:balance()
end
+function inet6:bits(n)
+ if type(n) ~= 'number' then return nil, 'n must be a number' end
+ if n < 1 or n > 32 or 128 % n ~= 0 then return nil, 'invalid value for n' end
+ local t = {}
+ local pcs = self.pcs
+ if n == 32 then
+ for i=1,8,2 do
+ insert(t, lshift(pcs[i], 16) + pcs[i+1])
+ end
+ else
+ for i=1,8 do
+ local p = pcs[i]
+ for j=16-n,0,-n do
+ insert(t, extract(p, j, n))
+ end
+ end
+ end
+ return t
+end
+
local M = {}
function M.set_mixed_networks(mixed_set)