5341bf902f
contrib/unber.py:39:22: E0606: Possibly using variable 'content' before assignment (possibly-used-before-assignment) Change-Id: I725cd5e05e3121c853669eb4bbfe5ba51b79eb75
43 lines
1.3 KiB
Python
Executable File
43 lines
1.3 KiB
Python
Executable File
#!/usr/bin/env python3
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# A more useful verion of the 'unber' tool provided with asn1c:
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# Give a hierarchical decode of BER/DER-encoded ASN.1 TLVs
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import sys
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import argparse
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from pySim.utils import bertlv_parse_one, bertlv_encode_tag, b2h, h2b
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def process_one_level(content: bytes, indent: int):
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remainder = content
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while len(remainder):
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tdict, l, v, remainder = bertlv_parse_one(remainder)
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#print(tdict)
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rawtag = bertlv_encode_tag(tdict)
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if tdict['constructed']:
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print("%s%s l=%d" % (indent*" ", b2h(rawtag), l))
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process_one_level(v, indent + 1)
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else:
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print("%s%s l=%d %s" % (indent*" ", b2h(rawtag), l, b2h(v)))
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option_parser = argparse.ArgumentParser(description='BER/DER data dumper')
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group = option_parser.add_mutually_exclusive_group(required=True)
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group.add_argument('--file', help='Input file')
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group.add_argument('--hex', help='Input hexstring')
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if __name__ == '__main__':
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opts = option_parser.parse_args()
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if opts.file:
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with open(opts.file, 'rb') as f:
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content = f.read()
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elif opts.hex:
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content = h2b(opts.hex)
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else:
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# avoid pylint "(possibly-used-before-assignment)" below
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sys.exit(2)
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process_one_level(content, 0)
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