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View Code? Open in Web Editor NEWPython library for calculating CRC16
Home Page: http://code.google.com/p/pycrc16
License: GNU Lesser General Public License v3.0
Python library for calculating CRC16
Home Page: http://code.google.com/p/pycrc16
License: GNU Lesser General Public License v3.0
==================================== 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)
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
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.
Hi,
How do I use it to get crc16xmodem for a file?
Thanks,
elichai2.
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)
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.
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