notrix / crc
Calculates CRC checksums for input data
dev-master
2017-07-25 20:14 UTC
This package is not auto-updated.
Last update: 2024-12-15 13:01:01 UTC
README
This is work in progress. I am not an expert on the topic by any means. Therefore, I have trouble finding and verifying information about common CRC algorithms. I am especially looking for reliable test vectors.
Implemented algorithms
- CRC1
- CRC16, CRC16-CCITT, CRC16-DNP, CRC16-Modbus, CRC16-QT, CRC16-USB, CRC16-XModem, CRC16-ZModem
Usage example
<?php // Autoloading via Composer require __DIR__ . '/vendor/autoload.php'; $crc16ccitt = new mermshaus\CRC\CRC16CCITT(); $crc16ccitt->update('Hello'); $crc16ccitt->update(' World!'); $checksum = $crc16ccitt->finish(); var_dump(bin2hex($checksum)); // string(4) "882a"
Testing
$ phpunit
Credits
- This library is mostly a port of Digest CRC for Ruby by Hal Brodigan.
Links
- Digest CRC. The Ruby library on which this library is based.
- pycrc. A tool for generating C code and corresponding lookup tables for diverse CRC algorithms. Used by Digest CRC.
- CRC calculation. An online calculator to generate checksums for arbitrary polynomials and input. Recommended by pycrc.
- On-line CRC calculation and free library. Another online calculator for some CRC algorithms.
- Catalogue of parametrised CRC algorithms. Information about many different CRC algorithms.