What is crc?
The crc npm package is used for generating cyclic redundancy check (CRC) codes for various input data. CRC is a popular method for detecting accidental changes to raw data in digital networks and storage devices. The package supports multiple CRC algorithms and can be used in various applications where data integrity is crucial.
What are crc's main functionalities?
CRC32 Calculation
This feature allows the calculation of CRC32 checksum for the input string 'hello world'. It is useful for verifying the integrity of strings or files.
const crc = require('crc');
const result = crc.crc32('hello world');
console.log('CRC32:', result);
CRC16 Calculation
This feature computes the CRC16 checksum for the given string. It's commonly used in telecommunications and storage for error-checking.
const crc = require('crc');
const result = crc.crc16('hello world');
console.log('CRC16:', result);
CRC1 Calculation
This feature calculates a simple CRC1 checksum, which can be used for basic error detection in scenarios where minimal data corruption checks are needed.
const crc = require('crc');
const result = crc.crc1('hello world');
console.log('CRC1:', result);
Other packages similar to crc
crc32
The crc32 package is similar to crc in that it provides CRC32 checksum calculations. However, it focuses solely on CRC32, whereas crc supports multiple algorithms including CRC1, CRC8, CRC16, and others, making crc more versatile.
buffer-crc32
buffer-crc32 is another npm package that offers CRC32 checksum calculations. It is designed to work specifically with Node.js buffers. Compared to crc, buffer-crc32 is more specialized for buffer data types while crc offers broader functionality with support for strings and other data types.
JavaScript CRC 8, 16 and 32.
This is a basic port/copy of the JavaScript CRC implementation. The module works with any CommonJS system supporting module.exports
notation as well as in the browser. When loaded in the browser, all functions end up under the window.crc
"namespace".
Original code is taken from http://www.digsys.se/JavaScript/CRC.aspx
Functions
The following functions are implemented:
crc8(String) #=> Number
crcArc(String) #=> Number
crc16(String) #=> Number
fcs16(String) #=> Number
crc32(String) #=> Number
hex8(Number) #=> String
hex16(Number) #=> String
hex32(Number) #=> String
Installation
git clone git://github.com/alexgorbatchev/node-crc.git
or
npm install crc
Running tests
$ npm install
$ make test