jsp-raknet
Version:
Basic RakNet implementation written in Javascript
87 lines (86 loc) • 3.16 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const jsbinaryutils_1 = __importDefault(require("@jsprismarine/jsbinaryutils"));
const Packet_1 = __importDefault(require("./Packet"));
// const MAX_ACK_PACKETS = 4096;
class AcknowledgePacket extends Packet_1.default {
constructor() {
super(...arguments);
// Array containing all sequence numbers of received (ACK)
// or lost (NACK) packets
this.packets = [];
}
decode() {
super.decode();
// Clear old cached decoded packets
this.packets = [];
const recordCount = this.readShort();
for (let i = 0; i < recordCount; i++) {
const notRange = this.readBool();
if (notRange) {
this.packets.push(this.readLTriad());
}
else {
const start = this.readLTriad();
const end = this.readLTriad();
for (let i = start; i <= end; i++) {
this.packets.push(i);
}
}
}
}
encode() {
super.encode();
this.packets.sort((a, b) => a - b);
let records = 0;
// We have to create a stream because the encoding is records + buffer
// but we need to send records first and to compute them we have to decode the packet
// and as we need to write first of all records, we cannot write decoded data so
// we keep them in a temporary stream that will be appended later on
let stream = new jsbinaryutils_1.default();
// Sort packets to ensure a correct encoding
let count = this.packets.length;
if (count > 0) {
let pointer = 1;
let start = this.packets[0];
let last = this.packets[0];
while (pointer < count) {
let current = this.packets[pointer++];
let diff = current - last;
if (diff === 1) {
last = current;
}
else if (diff > 1) {
if (start === last) {
stream.writeByte(1);
stream.writeLTriad(start);
start = last = current;
}
else {
stream.writeByte(0);
stream.writeLTriad(start);
stream.writeLTriad(last);
start = last = current;
}
records++;
}
}
if (start === last) {
stream.writeByte(1);
stream.writeLTriad(start);
}
else {
stream.writeByte(0);
stream.writeLTriad(start);
stream.writeLTriad(last);
}
records++;
}
this.writeShort(records);
this.append(stream.getBuffer());
}
}
exports.default = AcknowledgePacket;