@chainsafe/netmask/dist/src/util.js

Typescript implementation of netmask filtering

import { IPv4Len, IPv6Len } from "./ip.js";
export function allFF(a, from, to) {
    let i = 0;
    for (const e of a) {
        if (i < from)
            continue;
        if (i > to)
            break;
        if (e !== 0xff)
            return false;
        i++;
    }
    return true;
}
export function deepEqual(a, b, from, to) {
    let i = 0;
    for (const e of a) {
        if (i < from)
            continue;
        if (i > to)
            break;
        if (e !== b[i])
            return false;
        i++;
    }
    return true;
}
/***
 * Returns long ip format
 */
export function ipToString(ip) {
    switch (ip.length) {
        case IPv4Len: {
            return ip.join(".");
        }
        case IPv6Len: {
            const result = [];
            for (let i = 0; i < ip.length; i++) {
                if (i % 2 === 0) {
                    result.push(ip[i].toString(16).padStart(2, "0") +
                        ip[i + 1].toString(16).padStart(2, "0"));
                }
            }
            return result.join(":");
        }
        default: {
            throw new Error("Invalid ip length");
        }
    }
}
/**
 * If mask is a sequence of 1 bits followed by 0 bits, return number of 1 bits else -1
 */
export function simpleMaskLength(mask) {
    let ones = 0;
    // eslint-disable-next-line prefer-const
    for (let [index, byte] of mask.entries()) {
        if (byte === 0xff) {
            ones += 8;
            continue;
        }
        while ((byte & 0x80) != 0) {
            ones++;
            byte = byte << 1;
        }
        if ((byte & 0x80) != 0) {
            return -1;
        }
        for (let i = index + 1; i < mask.length; i++) {
            if (mask[i] != 0) {
                return -1;
            }
        }
        break;
    }
    return ones;
}
export function maskToHex(mask) {
    let hex = "0x";
    for (const byte of mask) {
        hex += (byte >> 4).toString(16) + (byte & 0x0f).toString(16);
    }
    return hex;
}
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