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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | 1x 1x 1x 1x 1x 1x | 'use strict';
const {find} = require('lodash');
const {constants} = require('../../lifx');
const Packet = {
size: 12
};
/**
* Converts packet specific data from a buffer to an object
* @param {Buffer} buf Buffer containing only packet specific data no header
* @return {Object} Information contained in packet
*/
Packet.toObject = function(buf) {
const obj = {};
let offset = 0;
// Check length
if (buf.length !== this.size) {
throw new Error('Invalid length given for stateHostFirmware LIFX packet');
}
obj.vendorId = buf.readUInt32LE(offset);
const vendor = find(constants.LIFX_VENDOR_IDS, {id: obj.vendorId});
if (vendor !== undefined) {
obj.vendorName = vendor.name;
}
offset += 4;
obj.productId = buf.readUInt32LE(offset);
offset += 4;
obj.version = buf.readUInt32LE(offset);
offset += 4;
return obj;
};
/**
* Converts the given packet specific object into a packet
* @param {Object} obj object with configuration data
* @return {Buffer} packet
*/
Packet.toBuffer = function(obj) {
const buf = Buffer.alloc(this.size);
buf.fill(0);
let offset = 0;
buf.writeUInt32LE(obj.vendor, offset);
offset += 4;
buf.writeUInt32LE(obj.product, offset);
offset += 4;
buf.writeUInt32LE(obj.version, offset);
offset += 4;
return buf;
};
module.exports = Packet;
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