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- '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))
- }
- }
|
