Mercurial > hgrepos > Python > apps > py-cutils

annotate shasum.py @ 10:77446cd3ea6f

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Move the digest generation loop from "main()" into an own function "generate_digests()". This is to prepare for proper "--check" support in the future.
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 04 Dec 2020 16:10:41 +0100
parents 81f28bf89c26
children 15c3416d3677
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1
bbf4e0f5b651 Begin the shasum.py script
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1 r"""
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2 :Author: Franz Glasner
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3 :Copyright: (c) 2020 Franz Glasner.
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4 All rights reserved.
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5 :License: BSD 3-Clause "New" or "Revised" License.
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6 See :ref:`LICENSE <license>` for details.
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7 If you cannot find LICENSE see
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8 <https://opensource.org/licenses/BSD-3-Clause>
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9 :ID: @(#) HGid$
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10
bbf4e0f5b651 Begin the shasum.py script
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11 """
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12
2
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13 from __future__ import print_function
1
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14
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15 import argparse
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16 import hashlib
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17 import sys
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18
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19
2
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20 PY2 = sys.version_info[0] < 3
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21
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22 CHUNK_SIZE = 1024 * 1024 * 1024
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23
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24
1
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25 def main(argv=None):
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26 aparser = argparse.ArgumentParser(
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27 description="Python implementation of shasum",
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28 fromfile_prefix_chars='@')
2
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29 aparser.add_argument(
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30 "--algorithm", "-a", action="store", type=argv2algo,
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31 help="1 (default), 224, 256, 384, 512, 3-224, 3-256, 3-384, 3-512, blake2b, blake2s, md5")
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32 aparser.add_argument(
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33 "--binary", "-b", action="store_false", dest="text_mode", default=False,
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34 help="read in binary mode (default)")
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35 aparser.add_argument(
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36 "--bsd", "-B", action="store_true", dest="bsd", default=False,
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37 help="write BSD style output; also :command:`openssl dgst` style")
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38 aparser.add_argument(
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39 "--reverse", "-r", action="store_false", dest="bsd", default=False,
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40 help="explicitely select normal coreutils style output (to be option compatible with BSD style commands and :command:`openssl dgst -r`)")
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41 aparser.add_argument(
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42 "--tag", action="store_true", dest="bsd", default=False,
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43 help="alias for the `--bsd' option (to be compatible with :command:`b2sum`)")
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44 aparser.add_argument(
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45 "--text", "-t", action="store_true", dest="text_mode", default=False,
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46 help="read in text mode (not supported)")
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47 aparser.add_argument(
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48 "files", nargs="*", metavar="FILE")
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49
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50 opts = aparser.parse_args(args=argv)
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51
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52 if opts.text_mode:
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53 print("ERROR: text mode not supported", file=sys.stderr)
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54 sys.exit(78) # :manpage:`sysexits(3)` EX_CONFIG
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55
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56 if not opts.algorithm:
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57 opts.algorithm = argv2algo("1")
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58
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59 if not opts.files:
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60 opts.files.append('-')
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61 generate_digests(opts)
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62
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63
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64 def generate_digests(opts):
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65 if opts.bsd:
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66 out = out_bsd
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67 else:
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68 out = out_std
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69 if len(opts.files) == 1 and opts.files[0] == '-':
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70 if PY2:
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71 if sys.platform == "win32":
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72 import os. msvcrt
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73 msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
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74 source = sys.stdin
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75 else:
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76 source = sys.stdin.buffer
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77 out(sys.stdout,
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78 compute_digest(opts.algorithm[0], source),
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79 None,
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80 opts.algorithm[1],
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81 True)
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82 else:
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83 for fn in opts.files:
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84 with open(fn, "rb") as source:
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85 out(sys.stdout,
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86 compute_digest(opts.algorithm[0], source),
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87 fn,
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88 opts.algorithm[1],
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89 True)
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90
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91
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92 def argv2algo(s):
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93 """Convert a commane line algorithm specifier into a tuple with the
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94 type/factory of the digest and the algorithms tag for output purposes
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95
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96 :param str s: the specifier from the commane line
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97 :return: the internal digest specification
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98 :rtype: a tuple (digest_type_or_factory, name_in_output)
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99
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100 String comparisons are done case-insensitively.
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101
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102 """
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103 s = s.lower()
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104 if s in ("1", "sha1"):
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105 return (hashlib.sha1, "SHA1")
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106 elif s in ("224", "sha224"):
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107 return (hashlib.sha224, "SHA224")
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108 elif s in ("256", "sha256"):
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109 return (hashlib.sha256, "SHA256")
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110 elif s in ("384", "sha384"):
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111 return (hashlib.sha384, "SHA384")
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112 elif s in ("512", "sha512"):
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113 return (hashlib.sha512, "SHA512")
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114 elif s in ("3-224", "sha3-224"):
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115 return (hashlib.sha3_224, "SHA3-224")
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116 elif s in ("3-256", "sha3-256"):
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117 return (hashlib.sha3_256, "SHA3-256")
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118 elif s in ("3-384", "sha3-384"):
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119 return (hashlib.sha3_384, "SHA3-384")
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120 elif s in ("3-512", "sha3-512"):
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121 return (hashlib.sha3_512, "SHA3-512")
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122 elif s in ("blake2b", "blake2b-512"):
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123 return (hashlib.blake2b, "BLAKE2b")
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124 elif s in ("blake2s", "blake2s-256"):
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125 return (hashlib.blake2s, "BLAKE2s")
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126 elif s == "md5":
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127 return (hashlib.md5, "MD5")
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128 else:
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129 raise argparse.ArgumentTypeError(
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130 "`{}' is not a recognized algorithm".format(s))
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131
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132
5
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133 def out_bsd(dest, digest, filename, digestname, binary):
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134 """BSD format output, also :command:`openssl dgst` and
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135 :command:`b2sum --tag" format output
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136
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137 """
5
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138 if filename is None:
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139 print(digest, file=dest)
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140 else:
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141 print("{} ({}) = {}".format(digestname, filename, digest),
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142 file=dest)
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143
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144
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145 def out_std(dest, digest, filename, digestname, binary):
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146 """Coreutils format (:command:`shasum` et al.)
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147
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148 """
5
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149 print("{} {}{}".format(digest,
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150 '*' if binary else ' ',
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151 '-' if filename is None else filename),
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152 file=dest)
2
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153
1
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154
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155 def compute_digest(hashobj, instream):
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156 """
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157
2
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158 :param hashobj: a :mod:`hashlib` compatible hash algorithm type or factory
1
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159 :param instream: a bytes input stream to read the data to be hashed from
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160 :return: the digest in hex form
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161 :rtype: str
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162
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163 """
2
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164 h = hashobj()
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165 while True:
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166 buf = instream.read(CHUNK_SIZE)
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167 if buf is not None:
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168 if len(buf) == 0:
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169 break
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170 h.update(buf)
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171 return h.hexdigest()
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172
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173
1
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174 if __name__ == "__main__":
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175 sys.exit(main())