gtrafimenkov / pycrc16 Goto Github PK

Python library for calculating CRC16

Home Page: http://code.google.com/p/pycrc16

License: GNU Lesser General Public License v3.0

C 17.47% Python 82.53%

pycrc16's Introduction

====================================
Python library for calculating CRC16
====================================

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 at
http://code.google.com/p/pycrc16/issues

Source codes are hosted at https://github.com/gennady/pycrc16
If 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 at
http://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:

* download source tarball, e.g. crc16-0.1.1.tar.gz,
  from http://code.google.com/p/pycrc16/downloads

* extract it with command::

    tar -xzf crc16-0.1.1.tar.gz

* compile and install the library::

    cd crc16-0.1.1
    python setup.py build
    sudo python setup.py install

  you will need the administrative privileges to execute the last
  command.

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:

* binascii.crc32 in the standart Python library

* pycrc (http://www.tty1.net/pycrc)

* crcmod (http://pypi.python.org/pypi/crcmod)

pycrc16's People

Contributors

Stargazers

Watchers

pycrc16's Issues

Add PY_SSIZE_T_CLEAN to the build as necessary.

Looks like some changes are needed for the 64 bit build. Running this code against 3.8 gives the following warning when calling it.

DeprecationWarning: PY_SSIZE_T_CLEAN will be required for '#' formats

Used a filter override to fix it for now.

Could You add CRC16/ARC

CRC16ARC_T =[
        0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
        0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
        0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
        0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
        0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
        0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
        0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
        0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
        0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
        0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
        0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
        0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
        0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
        0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
        0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
        0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
        0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
        0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
        0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
        0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
        0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
        0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
        0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
        0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
        0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
        0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
        0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
        0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
        0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
        0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
        0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
        0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040,
]

def _crc16ARC(data, crc, table):
        for byte in data:
            crc = ((crc>>8)^ table[(crc^(byte))&0xff])
        return crc 

    def crc16ARC(self,data):
        return self._crc16ARC(data,0,CRC16ARC_T)

Host prebuilt Windows binaries on PyPI

I think it'd be beneficial to host prebuilt binaries for windows on PyPI. It's not a deal breaker for most, but having to download 4.5GB of VS Build Tools isn't fun.

Get crc16xmodem for a file

Hi,
How do I use it to get crc16xmodem for a file?

Thanks,
elichai2.

SyntaxError on 2.5

When building on a Debian Lenny via easy_install with python2.5 I get:

Reading http://code.google.com/p/pycrc16
Best match: crc16 0.1.0
Downloading http://pypi.python.org/packages/source/c/crc16/crc16-0.1.0.tar.gz#md5=f57f01ba3ac87401f023ed9a8d5c08aa
Processing crc16-0.1.0.tar.gz
Running crc16-0.1.0/setup.py -q bdist_egg --dist-dir /tmp/easy_install-rSAFmC/crc16-0.1.0/egg-dist-tmp-gNM2Ts
File "build/bdist.linux-x86_64/egg/crc16/init.py", line 27
from .crc16pure import *
SyntaxError: 'import *' not allowed with 'from .'

zip_safe flag not set; analyzing archive contents...
Adding crc16 0.1.0 to easy-install.pth file

Installed /usr/lib/python2.5/site-packages/crc16-0.1.0-py2.5-linux-x86_64.egg

gtrafimenkov / pycrc16 Goto Github PK

pycrc16's Introduction

pycrc16's People

Contributors

Stargazers

Watchers

Forkers

pycrc16's Issues

Add PY_SSIZE_T_CLEAN to the build as necessary.

Could You add CRC16/ARC

Host prebuilt Windows binaries on PyPI

Get crc16xmodem for a file

SyntaxError on 2.5

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