crc16 (original) (raw)

Project description

CRC is a way of detecting accidental changes in data storage or transmission. There are many variants of CRC and CRC16, in particular. This library calculates only CRC16 (16-bit codes) and the only supported variant at the moment is CRC-CCITT (XModem).

If you want to know more about CRC,http://wikipedia.org/wiki/Cyclic_redundancy_check is a good place to start.

If you want other variants of CRC16 supported, please make a request athttp://code.google.com/p/pycrc16/issues

Source codes are hosted at https://github.com/gennady/pycrc16If you want to contribute to this library, create a fork, make you changes and then create a pull request. Any help is appreciated.

Installation

On Windows you can use precompiled binaries which can be found athttp://code.google.com/p/pycrc16/downloads

On Linux and other operation systems you should compile the library from the source codes. To do this on Linux use following steps:

After installation you can run unit tests to make sure that the library works fine. Execute:

python -m crc16.test

Usage

In Python 3:

import crc16 print(crc16.crc16xmodem(b'123456789'))

In Python 2 you should use strings instead of binary data:

import crc16 print(crc16.crc16xmodem('123456789'))

You can also calculate CRC gradually:

import crc16 crc = crc16.crc16xmodem(b'1234') crc = crc16.crc16xmodem(b'56789', crc) print(crc)

Other projects

There are a number of projects and libraries for CRC calculation. See for example:

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