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crc_models.py
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crc_models.py
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# -*- coding: Latin-1 -*-
# pycrc -- parametrisable CRC calculation utility and C source code generator
#
# Copyright (c) 2006-2009 Thomas Pircher <tehpeh@gmx.net>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software",, to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS': WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""
Collection of CRC models[]
use as follows:
from crc_models import CrcModels
models = CrcModels()
print(models.getList())
m = models.getParams("crc-32")
if m != None:
print(m['width'])
print(m['poly'])
print(m['reflect_in'])
print(m['xor_in'])
print(m['reflect_out'])
print(m['xor_out'])
print(m['direct'])
print(m['check'])
This file is part of pycrc.
"""
#import string
#import sys
# Class CrcModels
###############################################################################
class CrcModels(object):
"""
CRC Models
"""
models = []
models.append({
'name': 'crc-5',
'width': 5,
'poly': 0x05,
'reflect_in': True,
'xor_in': 0x1f,
'reflect_out': True,
'xor_out': 0x1f,
'direct': True,
'check': 0x19,
})
models.append({
'name': 'crc-8',
'width': 8,
'poly': 0x07,
'reflect_in': False,
'xor_in': 0x0,
'reflect_out': False,
'xor_out': 0x0,
'direct': True,
'check': 0xf4,
})
models.append({
'name': 'dallas-1-wire',
'width': 8,
'poly': 0x31,
'reflect_in': True,
'xor_in': 0x0,
'reflect_out': True,
'xor_out': 0x0,
'direct': True,
'check': 0xa1,
})
models.append({
'name': 'crc-15',
'width': 15,
'poly': 0x4599,
'reflect_in': False,
'xor_in': 0x0,
'reflect_out': False,
'xor_out': 0x0,
'direct': True,
'check': 0x59e,
})
models.append({
'name': 'crc-16',
'width': 16,
'poly': 0x8005,
'reflect_in': True,
'xor_in': 0x0,
'reflect_out': True,
'xor_out': 0x0,
'direct': True,
'check': 0xbb3d,
})
models.append({
'name': 'crc-16-usb',
'width': 16,
'poly': 0x8005,
'reflect_in': True,
'xor_in': 0xffff,
'reflect_out': True,
'xor_out': 0xffff,
'direct': True,
'check': 0xb4c8,
})
models.append({
'name': 'ccitt',
'width': 16,
'poly': 0x1021,
'reflect_in': False,
'xor_in': 0xffff,
'reflect_out': False,
'xor_out': 0x0,
'direct': True,
'check': 0x29b1,
})
models.append({
'name': 'r-crc-16',
'width': 16,
'poly': 0x0589,
'reflect_in': False,
'xor_in': 0x0,
'reflect_out': False,
'xor_out': 0x0001,
'direct': True,
'check': 0x007e,
})
models.append({
'name': 'kermit',
'width': 16,
'poly': 0x1021,
'reflect_in': True,
'xor_in': 0x0,
'reflect_out': True,
'xor_out': 0x0,
'direct': True,
'check': 0x2189,
})
models.append({
'name': 'x-25',
'width': 16,
'poly': 0x1021,
'reflect_in': True,
'xor_in': 0xffff,
'reflect_out': True,
'xor_out': 0xffff,
'direct': True,
'check': 0x906e,
})
models.append({
'name': 'xmodem',
'width': 16,
'poly': 0x8408,
'reflect_in': True,
'xor_in': 0x0,
'reflect_out': True,
'xor_out': 0x0,
'direct': True,
'check': 0xc73,
})
models.append({
'name': 'zmodem',
'width': 16,
'poly': 0x1021,
'reflect_in': False,
'xor_in': 0x0,
'reflect_out': False,
'xor_out': 0x0,
'direct': True,
'check': 0x31c3,
})
models.append({
'name': 'crc-24',
'width': 24,
'poly': 0x864cfb,
'reflect_in': False,
'xor_in': 0xb704ce,
'reflect_out': False,
'xor_out': 0x0,
'direct': True,
'check': 0x21cf02,
})
models.append({
'name': 'crc-32',
'width': 32,
'poly': 0x4c11db7,
'reflect_in': True,
'xor_in': 0xffffffff,
'reflect_out': True,
'xor_out': 0xffffffff,
'direct': True,
'check': 0xcbf43926,
})
models.append({
'name': 'crc-32c',
'width': 32,
'poly': 0x1edc6f41,
'reflect_in': True,
'xor_in': 0xffffffff,
'reflect_out': True,
'xor_out': 0xffffffff,
'direct': True,
'check': 0xe3069283,
})
models.append({
'name': 'crc-32mpeg',
'width': 32,
'poly': 0x4c11db7,
'reflect_in': False,
'xor_in': 0xffffffff,
'reflect_out': False,
'xor_out': 0x0,
'direct': False,
'check': 0x0376e6e7,
})
models.append({
'name': 'posix',
'width': 32,
'poly': 0x4c11db7,
'reflect_in': False,
'xor_in': 0x0,
'reflect_out': False,
'xor_out': 0xffffffff,
'direct': True,
'check': 0x765e7680,
})
models.append({
'name': 'jam',
'width': 32,
'poly': 0x4c11db7,
'reflect_in': True,
'xor_in': 0xffffffff,
'reflect_out': True,
'xor_out': 0x0,
'direct': True,
'check': 0x340bc6d9,
})
models.append({
'name': 'xfer',
'width': 32,
'poly': 0x000000af,
'reflect_in': False,
'xor_in': 0x0,
'reflect_out': False,
'xor_out': 0x0,
'direct': True,
'check': 0xbd0be338,
})
models.append({
'name': 'crc-64',
'width': 64,
'poly': 0x000000000000001b,
'reflect_in': True,
'xor_in': 0x0,
'reflect_out': True,
'xor_out': 0x0,
'direct': True,
'check': 0x46a5a9388a5beffe,
})
# function getList
###############################################################################
def getList(self):
"""
This function returns the list of supported CRC models
"""
l = []
for i in self.models:
l.append(i['name'])
return l
# function getParams
###############################################################################
def getParams(self, model):
"""
This function returns the paremeters of a given model
"""
model = model.lower();
for i in self.models:
if i['name'] == model:
return i
return None