dnp3-crc

A DNP 3.0 CRC checker and calculator for Node.js

Introduction

This is a module for checking and calculating the CRC used for DNP 3.0, ported from lpdu.cpp @ dnplib.

DNP stands for Distributed Network Protocol and more info can be found at www.dnp.org

Installation

$ npm install dnp3-crc

API

dnp3-crc.check(block)

Checks the two octet CRC at the end of block and returns if it is ok. block is an array.

dnp3-crc.calculate(block)

Calculates the CRC for block and returns it.

Usage

var crc = require('./dnp3-crc')
 
crc.calculate([0x05,0x64,0x05,0xC0,0x01,0x00,0x00,0x00])
//0xf891
 
crc.check([0x05,0x64,0x05,0xC0,0x01,0x00,0x00,0x00,0x91,0xF8])
//true
 
crc.check([0x05,0x64,0x0B,0xC9,0x01,0x00,0x00,0x00,0x91,0xF8])
//false

License

(The MIT License)

Copyright (c) 2014 Ivan Garavito <[e-mail]>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.