bigassfans/dist/SLIP.js

A library for discovering and controlling BigAssFans

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.unwrap = exports.wrap = void 0;
function wrap(b) {
    let escaped = [0xC0];
    for (let x of b) {
        if (x === 0xC0) {
            escaped.push(0xDB);
            escaped.push(0xDC);
        }
        else if (x === 0xDB) {
            escaped.push(0xDB);
            escaped.push(0xDD);
        }
        else {
            escaped.push(x);
        }
    }
    escaped.push(0xC0);
    let final = Buffer.from(escaped);
    return final;
}
exports.wrap = wrap;
function unwrap(b) {
    // Ignore incorrectly wrapped data
    if (b[0] !== 0xC0 || b[b.length - 1] !== 0xC0)
        return null;
    let unwrapped = [];
    let escapeSq = false;
    //Skip start and end 0xC0
    for (let x = 1; x < b.length - 1; x++) {
        if (escapeSq) {
            if (b[x] === 0xDC)
                unwrapped.push(0xC0);
            else if (b[x] === 0xDD)
                unwrapped.push(0xDB);
            else
                return null;
            escapeSq = false;
        }
        else if (b[x] === 0xDB) {
            escapeSq = true;
        }
        else {
            unwrapped.push(b[x]);
        }
    }
    return Buffer.from(unwrapped);
}
exports.unwrap = unwrap;