64 lines
1.8 KiB
TypeScript
64 lines
1.8 KiB
TypeScript
import type { Ipv4RangeExpanderResult } from './ipv4-range-expander.types';
|
|
import { convertBase } from '../integer-base-converter/integer-base-converter.model';
|
|
import { ipv4ToInt } from '../ipv4-address-converter/ipv4-address-converter.service';
|
|
export { calculateCidr };
|
|
|
|
function bits2ip(ipInt: number) {
|
|
return (ipInt >>> 24) + '.' + ((ipInt >> 16) & 255) + '.' + ((ipInt >> 8) & 255) + '.' + (ipInt & 255);
|
|
}
|
|
|
|
function getRangesize(start: string, end: string) {
|
|
if (start == null || end == null) return -1;
|
|
|
|
return 1 + parseInt(end, 2) - parseInt(start, 2);
|
|
}
|
|
|
|
function getCidr(start: string, end: string) {
|
|
if (start == null || end == null) return null;
|
|
|
|
const range = getRangesize(start, end);
|
|
if (range < 1) {
|
|
return null;
|
|
}
|
|
|
|
let mask = 32;
|
|
for (let i = 0; i < 32; i++) {
|
|
if (start[i] !== end[i]) {
|
|
mask = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
const newStart = start.substring(0, mask) + '0'.repeat(32 - mask);
|
|
const newEnd = end.substring(0, mask) + '1'.repeat(32 - mask);
|
|
|
|
return { start: newStart, end: newEnd, mask: mask };
|
|
}
|
|
|
|
function calculateCidr({ startIp, endIp }: { startIp: string; endIp: string }) {
|
|
const start = convertBase({
|
|
value: ipv4ToInt({ ip: startIp }).toString(),
|
|
fromBase: 10,
|
|
toBase: 2,
|
|
}).padStart(32, '0');
|
|
const end = convertBase({
|
|
value: ipv4ToInt({ ip: endIp }).toString(),
|
|
fromBase: 10,
|
|
toBase: 2,
|
|
}).padStart(32, '0');
|
|
|
|
const cidr = getCidr(start, end);
|
|
if (cidr != null) {
|
|
const result: Ipv4RangeExpanderResult = {};
|
|
result.newEnd = bits2ip(parseInt(cidr.end, 2));
|
|
result.newStart = bits2ip(parseInt(cidr.start, 2));
|
|
result.newCidr = result.newStart + '/' + cidr.mask;
|
|
result.newSize = getRangesize(cidr.start, cidr.end);
|
|
|
|
result.oldSize = getRangesize(start, end);
|
|
return result;
|
|
}
|
|
|
|
return undefined;
|
|
}
|