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Module:IP: Difference between revisions
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use uniqueId table for helper functions to create an IPAddress; implement ip:isInSubnet(); functions like subnet:getPrefix() return an IPAddress not a string, I assume
(implement IPAddress getNextIP and getPreviousIP) |
(use uniqueId table for helper functions to create an IPAddress; implement ip:isInSubnet(); functions like subnet:getPrefix() return an IPAddress not a string, I assume) |
||
Line 3:
-- Load modules
local bit32 = require('bit32')
local libraryUtil = require('libraryUtil')
local checkType = libraryUtil.checkType
Line 29 ⟶ 30:
-- Instead, move the metamethods into IPAddress.new(ip) so they can
-- access the data upvalue?
-- Hmmm, that would work only for self, not for the other object.
-- Is there a way of keeping data private but accessing it from metamethods?
-- If getIPParts is kept, perhaps it should be changed to "getParts" or similar
-- as "IP" is redundant in an IPAddress class.
------------------------------------------------------------------------
-- Functions from Module:IPblock follow.
-- TODO Massage following for style consistent with this module.
--------------------------------------------------------------------------------
Line 45 ⟶ 50:
join = function (self, sep)
return table.concat(self, sep)
end,▼
self.n = self.n - 1▼
end▼
end,
sort = function (self, comp)
Line 56 ⟶ 55:
end,
}
end▼
local function copyChanged(parts, down)▼
-- Return a copy of IPv4 or IPv6 parts, incremented or decremented.▼
-- Will wraparound:▼
-- increment 255.255.255.255 → 0.0.0.0▼
-- ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff → ::▼
-- decrement 0.0.0.0 → 255.255.255.255▼
-- :: → ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff▼
local result = { n = parts.n }▼
local carry = down and 0xffff or 1▼
for i = parts.n, 1, -1 do▼
local sum = parts[i] + carry▼
if sum >= 0x10000 then▼
carry = down and 0x10000 or 1▼
sum = sum - 0x10000▼
else▼
carry = down and 0xffff or 0▼
result[i] = sum▼
end▼
return result▼
local function copyPrefix(parts, length)
-- Return a copy of IPv4 or IPv6 parts, masked to length.
local result = { n = parts.n }
for i = 1, parts.n do
if length > 0 then
if length >= 16 then
result[i] = parts[i]
else
result[i] = bit32.band(parts[i],
bit32.arshift(0xffff8000, length - 1))
length = 0
▲ end
else
result[i] = 0
end
end
return result
end
Line 182 ⟶ 223:
end
return false
▲end
▲local function copyChanged(parts, down)
▲ -- Return a copy of IPv4 or IPv6 parts, incremented or decremented.
▲ -- Will wraparound:
▲ -- increment 255.255.255.255 → 0.0.0.0
▲ -- ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff → ::
▲ -- decrement 0.0.0.0 → 255.255.255.255
▲ -- :: → ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
▲ local result = { n = parts.n }
▲ local carry = down and 0xffff or 1
▲ for i = parts.n, 1, -1 do
▲ local sum = parts[i] + carry
▲ if sum >= 0x10000 then
▲ carry = down and 0x10000 or 1
▲ sum = sum - 0x10000
▲ else
▲ carry = down and 0xffff or 0
▲ end
▲ result[i] = sum
▲ end
▲ return result
end
--------------------------------------------------------------------------------
-- IPAddress class
-- Represents a single
--------------------------------------------------------------------------------
local IPAddress = {}
local uniqueId = {}
do
Line 242 ⟶ 262:
function obj:isInSubnet(subnet)
-- TODO Consider alternative of checking:
-- (ipFirst <= self and self <= ipLast)
if self:getVersion() == subnet:getVersion() then
local masked = IPAddress.new(uniqueId,
copyPrefix(data.parts, subnet:getBitLength()))
return masked == subnet:getPrefix()
end
return false
end
function obj:getNextIP()
return IPAddress.new(
end
function obj:getPreviousIP()
return IPAddress.new(
end
Line 259 ⟶ 286:
-- Set initial values
if ip ==
data.parts = parts
else
Line 310 ⟶ 337:
--------------------------------------------------------------------------------
-- Subnet class
-- Represents a block of
--------------------------------------------------------------------------------
Line 333 ⟶ 360:
function obj:getPrefix()
return IPAddress.new('1.2.
end
function obj:getHighestIP()
return IPAddress.new('1.2.
end
function obj:getBitLength()
return
end
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