Bluetooth-LE-Audio-Auracast-Transmitter/node_modules/@serialport/parser-cctalk/dist/index.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.CCTalkParser = void 0;
const stream_1 = require("stream");
/**
 * Parse the CCTalk protocol
 * @extends Transform
 *
 * A transform stream that emits CCTalk packets as they are received.
 */
class CCTalkParser extends stream_1.Transform {
    array;
    cursor;
    lastByteFetchTime;
    maxDelayBetweenBytesMs;
    constructor(maxDelayBetweenBytesMs = 50) {
        super();
        this.array = [];
        this.cursor = 0;
        this.lastByteFetchTime = 0;
        this.maxDelayBetweenBytesMs = maxDelayBetweenBytesMs;
    }
    _transform(buffer, encoding, cb) {
        if (this.maxDelayBetweenBytesMs > 0) {
            const now = Date.now();
            if (now - this.lastByteFetchTime > this.maxDelayBetweenBytesMs) {
                this.array = [];
                this.cursor = 0;
            }
            this.lastByteFetchTime = now;
        }
        this.cursor += buffer.length;
        // TODO: Better Faster es7 no supported by node 4
        // ES7 allows directly push [...buffer]
        // this.array = this.array.concat(Array.from(buffer)) //Slower ?!?
        Array.from(buffer).map(byte => this.array.push(byte));
        while (this.cursor > 1 && this.cursor >= this.array[1] + 5) {
            // full frame accumulated
            // copy command from the array
            const FullMsgLength = this.array[1] + 5;
            const frame = Buffer.from(this.array.slice(0, FullMsgLength));
            // Preserve Extra Data
            this.array = this.array.slice(frame.length, this.array.length);
            this.cursor -= FullMsgLength;
            this.push(frame);
        }
        cb();
    }
}
exports.CCTalkParser = CCTalkParser;