st-ethernet-ip
Version:
A simple node interface for Ethernet/IP.
81 lines (80 loc) • 2.26 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.stringToObj = exports.objToString = exports.bufferToString = exports.stringToBuffer = exports.delay = exports.promiseTimeout = void 0;
/**
* Wraps a Promise with a Timeout
*
* @param promise - Promise to add timeout to
* @param ms - Timeout Length (ms)
* @param error - Error to Emit if Timeout Occurs
* @returns promise that rejects if not completed by timeout length
*/
const promiseTimeout = (promise, ms, error = new Error("ASYNC Function Call Timed Out!!!")) => {
return new Promise((resolve, reject) => {
setTimeout(() => reject(error), ms);
promise.then(resolve).catch(reject);
});
};
exports.promiseTimeout = promiseTimeout;
/**
* Delays X ms
*
* @param ms - Delay Length (ms)
* @returns Promise resolved after delay length
*/
const delay = (ms) => new Promise(resolve => setTimeout(resolve, ms));
exports.delay = delay;
/**
* Helper Funcs to process strings
*
* @param buff - Buffer with encoded string length
* @returns String
*/
const bufferToString = (buff) => {
let newBuff = Buffer.from(buff);
const len = newBuff.readUInt32LE();
return newBuff.subarray(4, len + 4).toString();
};
exports.bufferToString = bufferToString;
/**
* Helper Funcs to process strings
*
* @param str - Text string
* @param len - Buffer Length to be encode string on to
* @returns Buffer
*/
const stringToBuffer = (str, len = 88) => {
const buf = Buffer.alloc(len);
buf.writeUInt32LE(str.length);
Buffer.from(str).copy(buf, 4);
return buf;
};
exports.stringToBuffer = stringToBuffer;
/**
* Convert string stucture object to string
*
* @param obj - string structure object
* @returns
*/
const objToString = (obj) => {
return String.fromCharCode(...obj.DATA.subarray(0, obj.LEN));
};
exports.objToString = objToString;
/**
* Convert string to string structure object
*
* @param str - String to encode
* @param len - Buffer length
* @returns
*/
const stringToObj = (str, len = 82) => {
const array = Array(len).fill(0);
[...str].forEach((c, k) => {
array[k] = c.charCodeAt();
});
return {
LEN: str.length,
DATA: array
};
};
exports.stringToObj = stringToObj;