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===== signature for changeset 85da58b83475
author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 18 May 2025 06:00:46 +0200
parents d038f0a9ba49
children
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180
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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1 #-----------------------------------------------------------------------------
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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2 # Low level CRC functions for use by crcmod. This version is implemented in
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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3 # Python for a couple of reasons. 1) Provide a reference implememtation.
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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4 # 2) Provide a version that can be used on systems where a C compiler is not
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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5 # available for building extension modules.
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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6 #
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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7 # Copyright (c) 2009 Raymond L. Buvel
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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8 # Copyright (c) 2010 Craig McQueen
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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9 #
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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10 # Permission is hereby granted, free of charge, to any person obtaining a copy
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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11 # of this software and associated documentation files (the "Software"), to deal
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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12 # in the Software without restriction, including without limitation the rights
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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13 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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14 # copies of the Software, and to permit persons to whom the Software is
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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15 # furnished to do so, subject to the following conditions:
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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16 #
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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17 # The above copyright notice and this permission notice shall be included in
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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18 # all copies or substantial portions of the Software.
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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19 #
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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20 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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21 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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22 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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23 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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24 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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25 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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26 # SOFTWARE.
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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27 #-----------------------------------------------------------------------------
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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28
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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29 def _get_buffer_view(in_obj):
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30 if isinstance(in_obj, str):
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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31 raise TypeError('Unicode-objects must be encoded before calculating a CRC')
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32 mv = memoryview(in_obj)
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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33 if mv.ndim > 1:
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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34 raise BufferError('Buffer must be single dimension')
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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35 return mv
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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36
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37
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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38 def _crc8(data, crc, table):
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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39 mv = _get_buffer_view(data)
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40 crc = crc & 0xFF
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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41 for x in mv.tobytes():
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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42 crc = table[x ^ crc]
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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43 return crc
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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44
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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45 def _crc8r(data, crc, table):
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46 mv = _get_buffer_view(data)
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47 crc = crc & 0xFF
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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48 for x in mv.tobytes():
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49 crc = table[x ^ crc]
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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50 return crc
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51
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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52 def _crc16(data, crc, table):
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53 mv = _get_buffer_view(data)
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54 crc = crc & 0xFFFF
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55 for x in mv.tobytes():
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56 crc = table[x ^ ((crc>>8) & 0xFF)] ^ ((crc << 8) & 0xFF00)
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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57 return crc
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58
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59 def _crc16r(data, crc, table):
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60 mv = _get_buffer_view(data)
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61 crc = crc & 0xFFFF
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62 for x in mv.tobytes():
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63 crc = table[x ^ (crc & 0xFF)] ^ (crc >> 8)
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64 return crc
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65
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66 def _crc24(data, crc, table):
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67 mv = _get_buffer_view(data)
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68 crc = crc & 0xFFFFFF
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69 for x in mv.tobytes():
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70 crc = table[x ^ (crc>>16 & 0xFF)] ^ ((crc << 8) & 0xFFFF00)
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71 return crc
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72
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73 def _crc24r(data, crc, table):
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74 mv = _get_buffer_view(data)
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75 crc = crc & 0xFFFFFF
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76 for x in mv.tobytes():
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77 crc = table[x ^ (crc & 0xFF)] ^ (crc >> 8)
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78 return crc
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79
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80 def _crc32(data, crc, table):
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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81 mv = _get_buffer_view(data)
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82 crc = crc & 0xFFFFFFFF
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83 for x in mv.tobytes():
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84 crc = table[x ^ ((crc>>24) & 0xFF)] ^ ((crc << 8) & 0xFFFFFF00)
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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85 return crc
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86
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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87 def _crc32r(data, crc, table):
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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88 mv = _get_buffer_view(data)
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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89 crc = crc & 0xFFFFFFFF
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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90 for x in mv.tobytes():
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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91 crc = table[x ^ (crc & 0xFF)] ^ (crc >> 8)
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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92 return crc
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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93
d038f0a9ba49 Vendored crcmod2 into sub-package "cutils.crcmod" as pure-Python implementation of additional "digests": CRC sums.
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diff changeset
94 def _crc64(data, crc, table):
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
95 mv = _get_buffer_view(data)
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
96 crc = crc & 0xFFFFFFFFFFFFFFFF
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
97 for x in mv.tobytes():
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
98 crc = table[x ^ ((crc>>56) & 0xFF)] ^ ((crc << 8) & 0xFFFFFFFFFFFFFF00)
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
99 return crc
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
100
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
101 def _crc64r(data, crc, table):
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
102 mv = _get_buffer_view(data)
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
103 crc = crc & 0xFFFFFFFFFFFFFFFF
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
104 for x in mv.tobytes():
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
105 crc = table[x ^ (crc & 0xFF)] ^ (crc >> 8)
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
106 return crc
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
107