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types.go
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package main
import (
"github.com/apaxa-go/helper/mathh"
"github.com/apaxa-go/helper/strconvh"
"strings"
)
type IPv4 uint32
func (ip IPv4) String() string {
o1 := uint8(ip >> 24)
o2 := uint8((ip >> 16) & mathh.MaxUint8)
o3 := uint8((ip >> 8) & mathh.MaxUint8)
o4 := uint8(ip & mathh.MaxUint8)
return strconvh.FormatUint8(o1) + "." + strconvh.FormatUint8(o2) + "." + strconvh.FormatUint8(o3) + "." + strconvh.FormatUint8(o4)
}
func (ip IPv4) Netmask(last IPv4) Prefix {
for m := Prefix(32); m > 0; m-- {
if ip == last {
return m
}
ip = ip >> 1
last = last >> 1
}
return 0
}
type Prefix uint8 // 0..32 for IPv4
const RemoveMask Prefix = 255
func (m Prefix) String() string {
return strconvh.FormatUint8(uint8(m))
}
func (m Prefix) Mask() IPv4 {
return IPv4(mathh.MaxUint32) << (32 - m)
}
type NETv4 struct {
IP IPv4
Prefix Prefix
}
func (n NETv4) String() string {
return n.IP.String() + "/" + n.Prefix.String()
}
func (n *NETv4) Normalize() {
n.IP &= n.Prefix.Mask()
}
func (n NETv4) Contains(n1 NETv4) bool {
return n.Prefix <= n1.Prefix && n.IP&n.Prefix.Mask() == n1.IP&n.Prefix.Mask()
}
func (n NETv4) Count() uint64 {
return 1 << (32 - n.Prefix)
}
func (n NETv4) First() IPv4 {
return n.IP & n.Prefix.Mask()
}
func (n NETv4) Last() IPv4 {
return n.IP | ^n.Prefix.Mask()
}
// Last meaning bit is 0
func (n NETv4) FirstInGroup() bool {
return n.Prefix != 0 && n.IP&(1<<(32-n.Prefix)) == 0
}
// Last meaning bit is 1
func (n NETv4) LastInGroup() bool {
return n.Prefix != 0 && n.IP&(1<<(32-n.Prefix)) > 0
}
func (n NETv4) GroupPair() NETv4 {
if n.Prefix == 0 {
return NETv4{}
}
var pair NETv4
pair.IP = n.IP ^ (1 << (32 - n.Prefix))
pair.Prefix = n.Prefix
return pair
}
func (n NETv4) SummaryMask(last NETv4) Prefix {
return n.IP.Netmask(last.Last())
}
type NETv4s []NETv4
func (n NETv4s) First() int {
i := 0
for i < len(n) && n[i].Prefix == RemoveMask {
i++
}
return i
}
func (n NETv4s) Last() int {
i := len(n) - 1
for i >= 0 && n[i].Prefix == RemoveMask {
i--
}
return i
}
func (n NETv4s) Next(i int) int {
return i + 1 + n[i+1:].First()
}
func (n NETv4s) Prev(i int) int {
return n[:i].Last()
}
func (n NETv4s) Count() uint64 {
count := uint64(0)
for i := range n {
count += n[i].Count()
}
return count
}
func (n NETv4s) string(sep string) string {
s := make([]string, len(n))
for i := range s {
s[i] = n[i].String()
}
return strings.Join(s, sep)
}
func (n NETv4s) String() string {
return n.string(", ")
}
func (n NETv4s) StringNL() string {
return n.string("\n")
}