Mercurial > hgrepos > Python > apps > py-cutils

annotate cutils/util/__init__.py @ 278:822cf3a1da22

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treesum: FIX: Removal of backslashes in output: do this only where really needed. Otherwise "backslashreplace" error encodings are "corrected" too.
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 21 Feb 2025 17:27:59 +0100
parents 0f4febf646f5
children 44e62e36cad4
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2020-2025 Franz Glasner
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4 # :License: BSD-3-Clause
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5 # :-
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6 r"""Utility package.
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7
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8 """
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9
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10 from __future__ import print_function, absolute_import
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11
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12
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13 __all__ = ["PY2",
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14 "PY35",
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15 "n", "b", "u",
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16 "normalize_filename",
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17 "argv2algo",
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18 "algotag2algotype",
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19 "get_blake2b",
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20 "get_blake2b_256",
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21 "get_blake2s",
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22 "default_algotag",
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23 "fsencode",
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24 "interpolate_bytes",
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25 ]
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27
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28 import argparse
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29 import hashlib
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30 import os
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31 import sys
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32
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33
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34 PY2 = sys.version_info[0] < 3
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35 PY35 = sys.version_info[:2] >= (3, 5)
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36
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37
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38 if PY2:
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39
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40 def n(s, encoding="ascii"):
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41 """Convert `s` to the native string implementation"""
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42 if isinstance(s, unicode): # noqa: F821 undefined name 'unicode'
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43 return s.encode(encoding)
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44 return s
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45
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46 def b(s, encoding="ascii"):
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47 """Convert `s` to bytes"""
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48 if isinstance(s, unicode): # noqa: F821 undefined name 'unicode'
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49 return s.encode(encoding)
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50 return s
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51
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52 def u(s, encoding="ascii"):
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53 """Convert `s` to a unicode string"""
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54 if isinstance(s, str):
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55 return s.decode(encoding)
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56 return s
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57
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58 else:
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59
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60 def n(s, encoding="ascii"):
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61 """Convert `s` to the native string implementation"""
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62 if isinstance(s, (bytes, bytearray)):
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63 return s.decode(encoding)
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64 return s
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65
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66 def b(s, encoding="ascii"):
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67 """Convert `s` to bytes"""
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68 if isinstance(s, str):
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69 return s.encode(encoding)
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70 return s
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71
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72 u = n
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73
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74
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75 def default_algotag():
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76 """Determine the "best" default algorithm.
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77
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78 Depend on availability in :mod:`hashlib`.
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79
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80 Prefer BLAKE2b-256, SHA256 or SHA1 -- in this order.
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81
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82 Does not consider :mod:`pyblake2` if it is available eventually.
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83
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84 """
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85 if "blake2b" in hashlib.algorithms_available:
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86 return "BLAKE2b-256"
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87 if "sha256" in hashlib.algorithms_available:
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88 return "SHA256"
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89 return "SHA1"
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90
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91
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92 def get_blake2b():
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93 """Get the factory for blake2b"""
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94 try:
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95 return hashlib.blake2b
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96 except AttributeError:
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97 import pyblake2
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98 return pyblake2.blake2b
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99
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100
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101 def get_blake2b_256():
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102 """Get the factory for blake2b-256"""
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103
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104 try:
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105 hashlib.blake2b
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106 except AttributeError:
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107 import pyblake2
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108
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109 def _get_blake():
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110 return pyblake2.blake2b(digest_size=32)
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111
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112 else:
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113
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114 def _get_blake():
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115 return hashlib.blake2b(digest_size=32)
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116
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117 return _get_blake
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118
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119
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120 def get_blake2s():
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121 """Get the factory for blake2s"""
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122 try:
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123 return hashlib.blake2s
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124 except AttributeError:
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125 import pyblake2
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126 return pyblake2.blake2s
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127
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128
184
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129 def get_crc(name):
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130 """Get the factory for a CRC"""
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131
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132 from ..crcmod.predefined import PredefinedCrc
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133
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134 def _crc_type():
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135 return PredefinedCrc(name)
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136
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137 return _crc_type
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138
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139
118
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140 def argv2algo(s):
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141 """Convert a command line algorithm specifier into a tuple with the
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142 type/factory of the digest and the algorithms tag for output purposes.
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143
172
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144 :param str s: the specifier from the command line; should include all
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145 algorithm tags also (for proper round-tripping)
118
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146 :return: the internal digest specification
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147 :rtype: a tuple (digest_type_or_factory, name_in_output)
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148 :raises argparse.ArgumentTypeError: for unrecognized algorithms or names
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149
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150 String comparisons are done case-insensitively.
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151
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152 """
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153 s = s.lower()
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154 if s in ("1", "sha1"):
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155 return (hashlib.sha1, "SHA1")
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156 elif s in ("224", "sha224"):
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157 return (hashlib.sha224, "SHA224")
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158 elif s in ("256", "sha256"):
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159 return (hashlib.sha256, "SHA256")
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160 elif s in ("384", "sha384"):
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161 return (hashlib.sha384, "SHA384")
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162 elif s in ("512", "sha512"):
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163 return (hashlib.sha512, "SHA512")
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164 elif s in ("3-224", "sha3-224"):
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165 return (hashlib.sha3_224, "SHA3-224")
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166 elif s in ("3-256", "sha3-256"):
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167 return (hashlib.sha3_256, "SHA3-256")
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168 elif s in ("3-384", "sha3-384"):
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169 return (hashlib.sha3_384, "SHA3-384")
120
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170 elif s in ("3", "3-512", "sha3-512"):
118
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171 return (hashlib.sha3_512, "SHA3-512")
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172 elif s in ("blake2b", "blake2b-512", "blake2", "blake2-512"):
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173 return (get_blake2b(), "BLAKE2b")
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174 elif s in ("blake2s", "blake2s-256"):
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175 return (get_blake2s(), "BLAKE2s")
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176 elif s in ("blake2-256", "blake2b-256"):
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177 return (get_blake2b_256(), "BLAKE2b-256")
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178 elif s == "md5":
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179 return (hashlib.md5, "MD5")
184
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180 elif s in ("crc24", "crc-24",
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181 "crc24-openpgp", "crc-24-openpgp"):
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182 return (get_crc("crc-24"), "CRC-24")
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183 elif s in ("crc32", "crc-32",
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184 "crc32-pkzip", "crc-32-pkzip",
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185 "crc32-iso", "crc-32-iso",
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186 "crc32-iso-hdlc", "crc-32-iso-hdlc"):
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187 return (get_crc("crc-32"), "CRC-32-ISO")
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188 elif s in ("crc32-posix", "crc-32-posix",
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189 "crc32-cksum", "crc-32-cksum",
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190 "posix"):
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191 return (get_crc("posix"), "CRC-32-POSIX")
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192 elif s in ("crc64", "crc-64",
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193 "crc64-iso", "crc-64-iso"):
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194 return (get_crc("crc-64"), "CRC-64-ISO")
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195 elif s in ("crc64-2", "crc-64-2",
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196 "crc64-iso-2", "crc-64-iso-2",
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197 "crc64-mcrc64", "crc-64-mcrc64"):
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198 return (get_crc("crc-64-2"), "CRC-64-ISO-2")
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199 elif s in ("crc64-ecma", "crc-64-ecma"):
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200 return (get_crc("crc-64-ecma"), "CRC-64-ECMA")
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201 elif s in ("crc64-xz", "crc-64-xz",
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202 "crc64-go-ecma", "crc-64-go-ecma"):
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203 return (get_crc("crc-64-xz"), "CRC-64-XZ")
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204 elif s in ("crc64-go", "crc-64-go",
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205 "crc64-go-iso", "crc-64-go-iso"):
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206 return (get_crc("crc-64-go"), "CRC-64-GO-ISO")
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207 elif s in ("crc64-redis", "crc-64-redis"):
185
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208 return (get_crc("crc-64-redis"), "CRC-64-REDIS")
118
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209 else:
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210 raise argparse.ArgumentTypeError(
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211 "`{}' is not a recognized algorithm".format(s))
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212
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213
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214 def algotag2algotype(s):
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215 """Convert the algorithm specifier in a BSD-style digest file to the
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216 type/factory of the corresponding algorithm.
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217
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218 :param str s: the tag (i.e. normalized name) or the algorithm
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219 :return: the digest type or factory for `s`
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220 :raises ValueError: on unknown and/or unhandled algorithms
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221
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222 All string comparisons are case-sensitive.
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223
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224 """
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225 if s == "SHA1":
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226 return hashlib.sha1
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227 elif s == "SHA224":
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228 return hashlib.sha224
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229 elif s == "SHA256":
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230 return hashlib.sha256
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231 elif s == "SHA384":
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232 return hashlib.sha384
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233 elif s == "SHA512":
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234 return hashlib.sha512
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235 elif s == "SHA3-224":
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236 return hashlib.sha3_224
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237 elif s == "SHA3-256":
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238 return hashlib.sha3_256
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239 elif s == "SHA3-384":
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240 return hashlib.sha3_384
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241 elif s == "SHA3-512":
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242 return hashlib.sha3_512
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243 elif s in ("BLAKE2b", "BLAKE2b-512", "BLAKE2b512"): # compat for openssl
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244 return get_blake2b()
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245 elif s in ("BLAKE2s", "BLAKE2s-256", "BLAKE2s256"): # compat for openssl
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246 return get_blake2s()
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247 elif s in ("BLAKE2b-256", "BLAKE2b256"): # also compat for openssl dgst
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248 return get_blake2b_256()
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249 elif s == "MD5":
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250 return hashlib.md5
184
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251 elif s == "CRC-24":
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252 return get_crc("crc-24")
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253 elif s == "CRC-32-ISO":
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254 return get_crc("crc-32")
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255 elif s == "CRC-32-POSIX":
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256 return get_crc("posix")
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257 elif s == "CRC-64-ISO":
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258 return get_crc("crc-64")
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259 elif s == "CRC-64-ISO-2":
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260 return get_crc("crc-64-2")
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261 elif s == "CRC-64-ECMA":
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262 return get_crc("crc-64-ecma")
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263 elif s == "CRC-64-XZ":
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264 return get_crc("crc-64-xz")
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265 elif s == "CRC-64-GO-ISO":
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266 return get_crc("crc-64-go")
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267 elif s == "CRC-64-REDIS":
185
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268 return get_crc("crc-64-redis")
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269 else:
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270 raise ValueError("unknown algorithm: {}".format(s))
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271
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272
278
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273 def normalize_filename(filename, strip_dot_slashes=False):
124
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274 if isinstance(filename, bytes):
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275 filename = filename.replace(b"\\", b"/")
278
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276 if strip_dot_slashes:
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277 while filename.startswith(b"./"):
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278 filename = filename[2:]
278
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279 # This also handles adjacent /./ cases
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280 while b"/./" in filename:
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281 filename = filename.replace(b"/./", b"/", 1)
124
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282 else:
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283 filename = filename.replace(u"\\", u"/")
278
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284 if strip_dot_slashes:
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285 while filename.startswith(u"./"):
124
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286 filename = filename[2:]
278
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287 # This also handles adjacent /./ cases
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288 while u"/./" in filename:
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289 filename = filename.replace(u"/./", u"/", 1)
118
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290 return filename
124
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291
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292
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293 def fsencode(what):
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294 """A somewhat compatibility function for :func:`os.fsencode`.
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295
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296 If `what` is of type :class:`bytes` no :func:`os.fsencode` is required.
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297
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298 """
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299 if isinstance(what, bytes):
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300 return what
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301 return os.fsencode(what)
173
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302
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303
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304 def interpolate_bytes(formatstr, *values):
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305 """Interpolate byte strings also on Python 3.4.
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306
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307 :param bytes formatstr:
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308 :param values: params for interpolation: may *not* contain Unicode strings
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309 :rvalue: the formatted octet
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310 :rtype: bytes
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311
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312 """
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313 assert isinstance(formatstr, bytes)
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314 # Python 3.5+ or Python2 know how to interpolate byte strings
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315 if PY35 or PY2:
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316 return formatstr % values
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317 # Workaround with a Latin-1 dance
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318 tformatstr = formatstr.decode("latin1")
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319 tvalues = []
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320 for v in values:
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321 if PY2:
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322 if isinstance(v, unicode): # noqa: F821 undefined name 'unicode'
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323 assert False
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324 else:
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325 if isinstance(v, str):
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326 assert False
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327 if isinstance(v, bytes):
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328 tvalues.append(v.decode("latin1"))
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329 else:
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330 tvalues.append(v)
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331 return (tformatstr % tuple(tvalues)).encode("latin1")