mirror of
https://github.com/littlefs-project/littlefs.git
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55ea13b994
I don't know how I completely missed that this doesn't actually work! Using del _does_ work in Python's repl, but it makes sense the repl may differ from actual function execution in this case. The problem is Python still thinks the relevant builtin is a local variables after deletion, raising an UnboundLocalError instead of performing a global lookup. In theory this would work if the variable could be made global, but since global/nonlocal statements are lifted, Python complains with "SyntaxError: name 'list' is parameter and global". And that's A-Ok! Intentionally shadowing language builtins already puts this code deep into ugly hacks territory.
110 lines
2.8 KiB
Python
Executable File
110 lines
2.8 KiB
Python
Executable File
#!/usr/bin/env python3
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# prevent local imports
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if __name__ == "__main__":
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__import__('sys').path.pop(0)
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import io
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import math as mt
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import os
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import struct
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import sys
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# open with '-' for stdin/stdout
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def openio(path, mode='r', buffering=-1):
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import os
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if path == '-':
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if 'r' in mode:
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return os.fdopen(os.dup(sys.stdin.fileno()), mode, buffering)
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else:
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return os.fdopen(os.dup(sys.stdout.fileno()), mode, buffering)
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else:
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return open(path, mode, buffering)
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def dbg_le32s(data, *,
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word_bits=32):
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# figure out le32 size in bytes
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if word_bits != 0:
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n = mt.ceil(word_bits / 8)
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# parse le32s, or le<whatevers>
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lines = []
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j = 0
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while j < len(data):
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word = 0
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d = 0
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while (j+d < len(data)
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and (d < n if word_bits != 0 else True)):
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word |= data[j+d] << d
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d += 1
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lines.append((
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' '.join('%02x' % b for b in data[j:j+d]),
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word))
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j += d
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# figure out widths
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w = [0]
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for l in lines:
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w[0] = max(w[0], len(l[0]))
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# then print results
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for l in lines:
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print('%-*s %s' % (
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w[0], l[0],
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l[1]))
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def main(le32s, *,
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hex=False,
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input=None,
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word_bits=32):
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import builtins
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hex_, hex = hex, builtins.hex
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# interpret as a sequence of hex bytes
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if hex_:
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bytes_ = [b for le32 in le32s for b in le32.split()]
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dbg_le32s(bytes(int(b, 16) for b in bytes_),
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word_bits=word_bits)
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# parse le32s in a file
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elif input:
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with openio(input, 'rb') as f:
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dbg_le32s(f.read(),
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word_bits=word_bits)
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# we don't currently have a default interpretation
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else:
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print("error: no -x/--hex or -i/--input?",
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file=sys.stderr)
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sys.exit(1)
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if __name__ == "__main__":
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import argparse
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import sys
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parser = argparse.ArgumentParser(
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description="Decode le32s.",
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allow_abbrev=False)
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parser.add_argument(
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'le32s',
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nargs='*',
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help="Le32s to decode.")
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parser.add_argument(
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'-x', '--hex',
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action='store_true',
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help="Interpret as a sequence of hex bytes.")
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parser.add_argument(
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'-i', '--input',
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help="Read le32s from this file. Can use - for stdin.")
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parser.add_argument(
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'-w', '--word-bits',
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nargs='?',
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type=lambda x: int(x, 0),
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const=0,
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help="Word size in bits. 0 is unbounded. Defaults to 32.")
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sys.exit(main(**{k: v
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for k, v in vars(parser.parse_intermixed_args()).items()
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if v is not None}))
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