'use strict'
|
|
const { MAX_MSGID } = require('../constants')
|
|
/**
|
* Compare a reference id with another id to determine "greater than or equal"
|
* between the two values according to a sliding window.
|
*
|
* @param {integer} ref
|
* @param {integer} comp
|
*
|
* @returns {boolean} `true` if the `comp` value is >= to the `ref` value
|
* within the computed window, otherwise `false`.
|
*/
|
module.exports = function geWindow (ref, comp) {
|
let max = ref + Math.floor(MAX_MSGID / 2)
|
const min = ref
|
if (max >= MAX_MSGID) {
|
// Handle roll-over
|
max = max - MAX_MSGID - 1
|
return ((comp <= max) || (comp >= min))
|
} else {
|
return ((comp <= max) && (comp >= min))
|
}
|
}
|
