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annotate cutils/crcmod/python2/predefined.py @ 242:ae9bc3006efc

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author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 08 Feb 2025 09:47:34 +0100
parents 5c5c0c5a7402
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1 #-----------------------------------------------------------------------------
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2 # Copyright (c) 2010 Craig McQueen
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3 # Copyright (c) 2025 Franz Glasner
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4 #
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5 # Permission is hereby granted, free of charge, to any person obtaining a copy
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6 # of this software and associated documentation files (the "Software"), to deal
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7 # in the Software without restriction, including without limitation the rights
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8 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 # copies of the Software, and to permit persons to whom the Software is
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10 # furnished to do so, subject to the following conditions:
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11 #
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12 # The above copyright notice and this permission notice shall be included in
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13 # all copies or substantial portions of the Software.
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14 #
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15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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17 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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18 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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19 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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20 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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21 # SOFTWARE.
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22 #-----------------------------------------------------------------------------
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23 '''
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24 crcmod.predefined defines some well-known CRC algorithms.
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26 To use it, e.g.:
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27 import crcmod.predefined
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28
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29 crc32func = crcmod.predefined.mkPredefinedCrcFun("crc-32")
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30 crc32class = crcmod.predefined.PredefinedCrc("crc-32")
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31
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32 crcmod.predefined.Crc is an alias for crcmod.predefined.PredefinedCrc
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33 But if doing 'from crc.predefined import *', only PredefinedCrc is imported.
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34 '''
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36 from __future__ import absolute_import
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38 # local imports
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39 from . import crcmod
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41 __all__ = [
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42 'PredefinedCrc',
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43 'mkPredefinedCrcFun',
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44 ]
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46 REVERSE = True
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47 NON_REVERSE = False
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48
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49 #
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50 # The following table defines the parameters of well-known CRC algorithms.
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51 # The "Check" value is the CRC for the ASCII byte sequence "123456789". It
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52 # can be used for unit tests.
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53 #
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54 # See also:
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55 # - https://en.wikipedia.org/wiki/Cyclic_redundancy_check
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56 # - https://reveng.sourceforge.io/crc-catalogue/all.htm
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57 # - http://users.ece.cmu.edu/~koopman/crc/index.html
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58 # - https://pycrc.org/models.html
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59 # - https://github.com/marzooqy/anycrc
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60 #
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61 _crc_definitions_table = [
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62 # Name Identifier-name, Poly Reverse Init-value XOR-out Check
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63 [ 'crc-8', 'Crc8', 0x107, NON_REVERSE, 0x00, 0x00, 0xF4, ],
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64 [ 'crc-8-darc', 'Crc8Darc', 0x139, REVERSE, 0x00, 0x00, 0x15, ],
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65 [ 'crc-8-i-code', 'Crc8ICode', 0x11D, NON_REVERSE, 0xFD, 0x00, 0x7E, ],
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66 [ 'crc-8-itu', 'Crc8Itu', 0x107, NON_REVERSE, 0x55, 0x55, 0xA1, ],
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67 [ 'crc-8-maxim', 'Crc8Maxim', 0x131, REVERSE, 0x00, 0x00, 0xA1, ],
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68 [ 'crc-8-rohc', 'Crc8Rohc', 0x107, REVERSE, 0xFF, 0x00, 0xD0, ],
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69 [ 'crc-8-wcdma', 'Crc8Wcdma', 0x19B, REVERSE, 0x00, 0x00, 0x25, ],
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70
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71 [ 'crc-16', 'Crc16', 0x18005, REVERSE, 0x0000, 0x0000, 0xBB3D, ],
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72 [ 'crc-16-buypass', 'Crc16Buypass', 0x18005, NON_REVERSE, 0x0000, 0x0000, 0xFEE8, ],
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73 [ 'crc-16-dds-110', 'Crc16Dds110', 0x18005, NON_REVERSE, 0x800D, 0x0000, 0x9ECF, ],
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74 [ 'crc-16-dect', 'Crc16Dect', 0x10589, NON_REVERSE, 0x0001, 0x0001, 0x007E, ],
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75 [ 'crc-16-dnp', 'Crc16Dnp', 0x13D65, REVERSE, 0xFFFF, 0xFFFF, 0xEA82, ],
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76 [ 'crc-16-en-13757', 'Crc16En13757', 0x13D65, NON_REVERSE, 0xFFFF, 0xFFFF, 0xC2B7, ],
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77 [ 'crc-16-genibus', 'Crc16Genibus', 0x11021, NON_REVERSE, 0x0000, 0xFFFF, 0xD64E, ],
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78 [ 'crc-16-maxim', 'Crc16Maxim', 0x18005, REVERSE, 0xFFFF, 0xFFFF, 0x44C2, ],
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79 [ 'crc-16-mcrf4xx', 'Crc16Mcrf4xx', 0x11021, REVERSE, 0xFFFF, 0x0000, 0x6F91, ],
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80 [ 'crc-16-riello', 'Crc16Riello', 0x11021, REVERSE, 0x554D, 0x0000, 0x63D0, ],
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81 [ 'crc-16-t10-dif', 'Crc16T10Dif', 0x18BB7, NON_REVERSE, 0x0000, 0x0000, 0xD0DB, ],
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82 [ 'crc-16-teledisk', 'Crc16Teledisk', 0x1A097, NON_REVERSE, 0x0000, 0x0000, 0x0FB3, ],
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83 [ 'crc-16-usb', 'Crc16Usb', 0x18005, REVERSE, 0x0000, 0xFFFF, 0xB4C8, ],
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84 [ 'x-25', 'CrcX25', 0x11021, REVERSE, 0x0000, 0xFFFF, 0x906E, ],
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85 [ 'xmodem', 'CrcXmodem', 0x11021, NON_REVERSE, 0x0000, 0x0000, 0x31C3, ],
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86 [ 'modbus', 'CrcModbus', 0x18005, REVERSE, 0xFFFF, 0x0000, 0x4B37, ],
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87
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88 # Note definitions of CCITT are disputable. See:
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89 # http://homepages.tesco.net/~rainstorm/crc-catalogue.htm
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90 # http://web.archive.org/web/20071229021252/http://www.joegeluso.com/software/articles/ccitt.htm
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91 [ 'kermit', 'CrcKermit', 0x11021, REVERSE, 0x0000, 0x0000, 0x2189, ],
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92 [ 'crc-ccitt-false', 'CrcCcittFalse', 0x11021, NON_REVERSE, 0xFFFF, 0x0000, 0x29B1, ],
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93 [ 'crc-aug-ccitt', 'CrcAugCcitt', 0x11021, NON_REVERSE, 0x1D0F, 0x0000, 0xE5CC, ],
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94
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95 [ 'crc-24', 'Crc24', 0x1864CFB, NON_REVERSE, 0xB704CE, 0x000000, 0x21CF02, ],
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96 [ 'crc-24-flexray-a', 'Crc24FlexrayA', 0x15D6DCB, NON_REVERSE, 0xFEDCBA, 0x000000, 0x7979BD, ],
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97 [ 'crc-24-flexray-b', 'Crc24FlexrayB', 0x15D6DCB, NON_REVERSE, 0xABCDEF, 0x000000, 0x1F23B8, ],
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98
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99 [ 'crc-32', 'Crc32', 0x104C11DB7, REVERSE, 0x00000000, 0xFFFFFFFF, 0xCBF43926, ],
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100 [ 'crc-32-bzip2', 'Crc32Bzip2', 0x104C11DB7, NON_REVERSE, 0x00000000, 0xFFFFFFFF, 0xFC891918, ],
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101 [ 'crc-32c', 'Crc32C', 0x11EDC6F41, REVERSE, 0x00000000, 0xFFFFFFFF, 0xE3069283, ],
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102 [ 'crc-32d', 'Crc32D', 0x1A833982B, REVERSE, 0x00000000, 0xFFFFFFFF, 0x87315576, ],
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103 [ 'crc-32-mpeg', 'Crc32Mpeg', 0x104C11DB7, NON_REVERSE, 0xFFFFFFFF, 0x00000000, 0x0376E6E7, ],
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104 [ 'posix', 'CrcPosix', 0x104C11DB7, NON_REVERSE, 0xFFFFFFFF, 0xFFFFFFFF, 0x765E7680, ],
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105 [ 'crc-32q', 'Crc32Q', 0x1814141AB, NON_REVERSE, 0x00000000, 0x00000000, 0x3010BF7F, ],
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106 [ 'jamcrc', 'CrcJamCrc', 0x104C11DB7, REVERSE, 0xFFFFFFFF, 0x00000000, 0x340BC6D9, ],
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107 [ 'xfer', 'CrcXfer', 0x1000000AF, NON_REVERSE, 0x00000000, 0x00000000, 0xBD0BE338, ],
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108
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109 # 64-bit
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110 # Name Identifier-name, Poly Reverse Init-value XOR-out Check
182
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111 [ 'crc-64', 'Crc64', 0x1000000000000001B, REVERSE, 0x0000000000000000, 0x0000000000000000, 0x46A5A9388A5BEFFE, ], # ISO POLY
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112 # See https://lwn.net/Articles/976030/ (MCRC64, used as CRC-64 in the Linux kernel)
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113 [ 'crc-64-2', 'Crc64_2', 0x1000000000000001B, NON_REVERSE, 0x0000000000000000, 0x0000000000000000, 0xE4FFBEA588933790, ], # fag, ISO POLY
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114 [ 'crc-64-go', 'Crc64Go', 0x1000000000000001B, REVERSE, 0x0000000000000000, 0xFFFFFFFFFFFFFFFF, 0xB90956C775A41001, ], # fag, ISO POLY
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115 [ 'crc-64-ecma', 'Crc64Ecma', 0x142F0E1EBA9EA3693, NON_REVERSE, 0x0000000000000000, 0x0000000000000000, 0x6C40DF5F0B497347, ], # fag
180
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116 [ 'crc-64-we', 'Crc64We', 0x142F0E1EBA9EA3693, NON_REVERSE, 0x0000000000000000, 0xFFFFFFFFFFFFFFFF, 0x62EC59E3F1A4F00A, ],
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117 [ 'crc-64-jones', 'Crc64Jones', 0x1AD93D23594C935A9, REVERSE, 0xFFFFFFFFFFFFFFFF, 0x0000000000000000, 0xCAA717168609F281, ],
182
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118 [ 'crc-64-xz', 'Crc64Xz', 0x142F0E1EBA9EA3693, REVERSE, 0x0000000000000000, 0xFFFFFFFFFFFFFFFF, 0x995DC9BBDF1939FA, ], # fag, ECMA POLY
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119 [ 'crc-64-redis', 'Crc64Redis', 0x1AD93D23594C935A9, REVERSE, 0x0000000000000000, 0x0000000000000000, 0xE9C6D914C4b8D9CA, ], # fag
180
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120 ]
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121
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122
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123 def _simplify_name(name):
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124 """
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125 Reduce CRC definition name to a simplified form:
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126 * lowercase
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127 * dashes removed
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128 * spaces removed
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129 * any initial "CRC" string removed
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130 """
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131 name = name.lower()
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132 name = name.replace('-', '')
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133 name = name.replace(' ', '')
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134 if name.startswith('crc'):
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135 name = name[len('crc'):]
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136 return name
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137
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138
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139 _crc_definitions_by_name = {}
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140 _crc_definitions_by_identifier = {}
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141 _crc_definitions = []
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142
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143 _crc_table_headings = [ 'name', 'identifier', 'poly', 'reverse', 'init', 'xor_out', 'check' ]
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144
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145 for table_entry in _crc_definitions_table:
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146 crc_definition = dict(zip(_crc_table_headings, table_entry))
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147 _crc_definitions.append(crc_definition)
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148 name = _simplify_name(table_entry[0])
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149 if name in _crc_definitions_by_name:
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150 raise Exception("Duplicate entry for '%s' in CRC table" % name)
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151 _crc_definitions_by_name[name] = crc_definition
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152 _crc_definitions_by_identifier[table_entry[1]] = crc_definition
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153
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154
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155 def _get_definition_by_name(crc_name):
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156 definition = _crc_definitions_by_name.get(_simplify_name(crc_name), None)
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157 if not definition:
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158 definition = _crc_definitions_by_identifier.get(crc_name, None)
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159 if not definition:
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160 raise KeyError("Unkown CRC name '%s'" % crc_name)
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161 return definition
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162
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163
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164 class PredefinedCrc(crcmod.Crc):
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165 def __init__(self, crc_name):
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166 definition = _get_definition_by_name(crc_name)
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167 crcmod.Crc.__init__(self, poly=definition['poly'], initCrc=definition['init'], rev=definition['reverse'], xorOut=definition['xor_out'])
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168
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169
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170 # crcmod.predefined.Crc is an alias for crcmod.predefined.PredefinedCrc
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171 Crc = PredefinedCrc
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172
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173
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174 def mkPredefinedCrcFun(crc_name):
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diff changeset
175 definition = _get_definition_by_name(crc_name)
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 return crcmod.mkCrcFun(poly=definition['poly'], initCrc=definition['init'], rev=definition['reverse'], xorOut=definition['xor_out'])
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 # crcmod.predefined.mkCrcFun is an alias for crcmod.predefined.mkPredefinedCrcFun
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 mkCrcFun = mkPredefinedCrcFun