@hazae41/kcp/dist/esm/mods/kcp/segment.mjs

Zero-copy KCP protocol for the web

import { Opaque } from '@hazae41/binary';

class KcpSegment {
    conversation;
    command;
    count;
    window;
    timestamp;
    serial;
    unackSerial;
    fragment;
    fragmentSize;
    static commands = {
        push: 81,
        ack: 82,
        wask: 83,
        wins: 84
    };
    constructor(
    /**
     * conv
     */
    conversation, 
    /**
     * cmd
     */
    command, 
    /**
     * frg
     */
    count = 0, 
    /**
     * wnd
     */
    window = 65535, 
    /**
     * ts
     */
    timestamp = Math.ceil(Date.now() / 1000), 
    /**
     * sn
     */
    serial, 
    /**
     * una
     */
    unackSerial, 
    /**
     * data
     */
    fragment, 
    /**
     * data size
     */
    fragmentSize) {
        this.conversation = conversation;
        this.command = command;
        this.count = count;
        this.window = window;
        this.timestamp = timestamp;
        this.serial = serial;
        this.unackSerial = unackSerial;
        this.fragment = fragment;
        this.fragmentSize = fragmentSize;
    }
    static empty(params) {
        const { conversation, command, count, window, timestamp, serial, unackSerial, fragment } = params;
        return new KcpSegment(conversation, command, count, window, timestamp, serial, unackSerial, fragment, 0);
    }
    static newOrThrow(params) {
        const { conversation, command, count, window, timestamp, serial, unackSerial, fragment } = params;
        return new KcpSegment(conversation, command, count, window, timestamp, serial, unackSerial, fragment, fragment.sizeOrThrow());
    }
    sizeOrThrow() {
        return 0
            + 4
            + 1
            + 1
            + 2
            + 4
            + 4
            + 4
            + 4
            + this.fragmentSize;
    }
    writeOrThrow(cursor) {
        cursor.writeUint32OrThrow(this.conversation, true);
        cursor.writeUint8OrThrow(this.command);
        cursor.writeUint8OrThrow(this.count);
        cursor.writeUint16OrThrow(this.window, true);
        cursor.writeUint32OrThrow(this.timestamp, true);
        cursor.writeUint32OrThrow(this.serial, true);
        cursor.writeUint32OrThrow(this.unackSerial, true);
        cursor.writeUint32OrThrow(this.fragmentSize, true);
        this.fragment.writeOrThrow(cursor);
    }
    static readOrThrow(cursor) {
        const conversation = cursor.readUint32OrThrow(true);
        const command = cursor.readUint8OrThrow();
        const count = cursor.readUint8OrThrow();
        const window = cursor.readUint16OrThrow(true);
        const timestamp = cursor.readUint32OrThrow(true);
        const serial = cursor.readUint32OrThrow(true);
        const unackSerial = cursor.readUint32OrThrow(true);
        const length = cursor.readUint32OrThrow(true);
        const bytes = cursor.readAndCopyOrThrow(length);
        const fragment = new Opaque(bytes);
        return KcpSegment.newOrThrow({ conversation, command, count, window, timestamp, serial, unackSerial, fragment });
    }
}

export { KcpSegment };
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