all files / lib/lifx/packets/ stateInfo.js

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'use strict';
 
var utils = require('../../lifx').utils;
 
var Packet = {
  size: 24
};
 
Packet.parseNanoseconds = function (buf) {
  if (buf.length !== 8) {
    throw new Error('Invalid length given for nanoseconds field');
  }
 
  var low = buf.readUInt32LE(0);
  var high = buf.readUInt32LE(4);
 
  return (high * 2 * 32 + low) / 1.0E9;
};
 
/**
 * 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) {
  var obj = {};
  var offset = 0;
 
  // Check length
  if (buf.length !== this.size) {
    throw new Error('Invalid length given for stateInfo LIFX packet');
  }
 
  obj.time = this.parseNanoseconds(utils.readUInt64LE(buf, offset));
  offset += 8;
 
  obj.uptime = this.parseNanoseconds(utils.readUInt64LE(buf, offset));
  offset += 8;
 
  obj.downtime = this.parseNanoseconds(utils.readUInt64LE(buf, offset));
  offset += 8;
 
  return obj;
};
 
module.exports = Packet;