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Copy pathmac.js
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102 lines (88 loc) · 3.16 KB
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// Copyright (c) 2013, Benjamin J. Kelly ("Author")
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/**
* @author https://github.com/wanderview
*/
export default class MAC{
/**
* @param {string} mac
* @returns {boolean}
*/
static isMAC(mac){
if(mac === undefined) return false
try{
let copy = String(mac).split(':')
if(copy.length != 6) return false
for(let set of copy){
if(set.length != 2) return false
for(let item of set.split('')){
let n = parseInt(item, 16)
if(isNaN(n)) return false
}
}
}catch(e){ return false }
return true
}
/**
* @param {buffer} buffer
* @param {number} offset
*/
static toString(buffer, offset){
offset = ~~offset
let addressClass = []
for (let i = 0; i < MAC.length; ++i) {
let classByte = buffer.readUInt8(offset + i)
let classString = classByte.toString(16)
if (classString.length == 1) classString = `0${classString}`
addressClass.push(classString)
}
return addressClass.join(':')
}
/**
* @param {string} macString
* @param {buffer} buffer
* @param {number} offset
*/
static toBuffer(macString, buffer, offset){
offset = ~~offset
if (!MAC.isMAC(macString))
throw new Error(`Invalid MAC Address: ${macString}`)
if(!(buffer instanceof Buffer))
buffer = Buffer.alloc(MAC.length + offset)
let addressClass = macString.split(':')
for (let i = 0; i < MAC.length; ++i) {
let classByte = parseInt(addressClass[i], 16)
buffer.writeUInt8(classByte, offset + i)
}
return buffer
}
static get length(){
return 6 // NO SUPPORT EXTERNAL TYPES
}
static get full(){
return 'ff:ff:ff:ff:ff:ff'
}
static get empty(){
return '00:00:00:00:00:00'
}
}