File size: 2,272 Bytes
a5d718a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | "use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isInSubnet = isInSubnet;
exports.isCorrect = isCorrect;
exports.prefixLengthFromMask = prefixLengthFromMask;
exports.numberToPaddedHex = numberToPaddedHex;
exports.stringToPaddedHex = stringToPaddedHex;
exports.testBit = testBit;
const address_error_1 = require("./address-error");
function isInSubnet(address) {
if (this.subnetMask < address.subnetMask) {
return false;
}
if (this.mask(address.subnetMask) === address.mask()) {
return true;
}
return false;
}
function isCorrect(defaultBits) {
return function () {
if (this.addressMinusSuffix !== this.correctForm()) {
return false;
}
if (this.subnetMask === defaultBits && !this.parsedSubnet) {
return true;
}
return this.parsedSubnet === String(this.subnetMask);
};
}
/**
* Returns the prefix length (number of leading 1 bits) of a contiguous
* subnet mask. Throws `AddressError` if the mask is non-contiguous (e.g.
* `255.0.255.0`).
*/
function prefixLengthFromMask(value, totalBits) {
const binary = value.toString(2).padStart(totalBits, '0');
if (binary.length > totalBits) {
throw new address_error_1.AddressError('Invalid subnet mask.');
}
const firstZero = binary.indexOf('0');
if (firstZero === -1) {
return totalBits;
}
if (binary.slice(firstZero).includes('1')) {
throw new address_error_1.AddressError('Invalid subnet mask.');
}
return firstZero;
}
function numberToPaddedHex(number) {
return number.toString(16).padStart(2, '0');
}
function stringToPaddedHex(numberString) {
return numberToPaddedHex(parseInt(numberString, 10));
}
/**
* @param binaryValue Binary representation of a value (e.g. `10`)
* @param position Byte position, where 0 is the least significant bit
*/
function testBit(binaryValue, position) {
const { length } = binaryValue;
if (position > length) {
return false;
}
const positionInString = length - position;
return binaryValue.substring(positionInString, positionInString + 1) === '1';
}
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