ts-struct
v1.0.2
Published
💻 Typed binary serializer
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TS Struct
Typed binary serializer
📦 Installation
- Using
npm
npm i ts-struct
- Using
Yarn
yarn add ts-struct
- Using
pnpm
pnpm add ts-struct
⚙️ Usage
Model raw packets
import { struct, types } from "ts-struct";
export enum EtherType {
Ether = 0x00_01,
IPv4 = 0x08_00,
ARP = 0x08_06,
IPv6 = 0x86_dd
}
export class MacAddress extends struct.bigEndian({
value: types.bytes(6)
}) {
static readonly TYPE = EtherType.Ether;
static readonly DEFAULT = MacAddress.parse("00:00:00:00:00:00");
static parse(address: string) {
const raw = address.replace(/[:-]/g, "");
const value = Buffer.from(raw, "hex").slice(0, MacAddress.SIZE);
return new this({ value });
}
get address() {
return [...this.data.value]
.map((value) => value.toString(16).padStart(2, "0"))
.join(":");
}
}
export class IPv4Address extends struct.bigEndian({
value: types.bytes(4)
}) {
static readonly TYPE = EtherType.IPv4;
static readonly DEFAULT = IPv4Address.from("0.0.0.0");
static from(address: string) {
const raw = address.split(".").map((part) => Number.parseInt(part, 10));
const value = Buffer.from(raw).slice(0, IPv4Address.SIZE);
return new this({ value });
}
}
export enum ARPOperation {
REQUEST = 0x00_01,
REPLY = 0x00_02
}
const net = Object.freeze({
ether: types.enum<EtherType>(types.uint16, EtherType, EtherType.Ether),
mac: types.any(MacAddress, MacAddress.DEFAULT.data),
ipv4: types.any(IPv4Address, IPv4Address.DEFAULT.data),
arpOperation: types.enum<ARPOperation>(
types.uint16,
ARPOperation,
ARPOperation.REPLY
)
});
export const Ethernet = struct.bigEndian({
source: net.mac,
target: net.mac,
type: net.ether
});