78 lines
2.7 KiB
Plaintext
78 lines
2.7 KiB
Plaintext
From: hyoon at bigfoot.com (Hoon Yoon)
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Date: Fri, 16 Apr 1999 14:12:30 -0400
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Subject: restore sources from PYC [Q]
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References: <000101be879c$8aed0670$6eba0ac8@kuarajy.infosys.com.ar> <m3aew9njhp.fsf@atrus.jesus.cam.ac.uk>
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Message-ID: <37177D8E.FF43BF65@bigfoot.com>
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Content-Length: 2440
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X-UID: 134
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Hi,
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What happens if you do NOT want your pyc codes to be reverse engineered?
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Can you prevent someone from doing this type of rev eng?
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Some members in my IT committee always have a problem with this ability
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and often used as excuse to kill any new tech adoption.
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Michael Hudson wrote:
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>
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> "Bruno Mattarollo" <brunomadv at ciudad.com.ar> writes:
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> > Hi!
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> >
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> > By mistake I am unable to find the PY files (source) from a project I was
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> > working on. I only have the PYC files... Is there a way to recover the
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> > sources from the PYC? I only need my sources, I don't give a d... for the
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> > comments...
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>
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> Well.... The pyc files are marshalled code objects (after an eight
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> byte header), and there's the standard module dis which can
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> disassemble code objects, from which you could have a stab at
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> rewriting your code. You certainly wouldn't *want* to do it this way.
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>
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> It would probably be within the bounds of possibility to write a
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> decompiler, though unless you've lost a vast heap of code this is
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> going to be a much bigger project than rewriting your code.
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>
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> Anyway, if it helps, here's a function that'll pull the code out of a
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> .pyc file and disassemble that code:
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>
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> def dis_pyc(pyc_name):
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> import marshal,dis
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> file=open(pyc_name,'rb')
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> file.read(8)
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> code=marshal.load(file)
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> did.dis(code)
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>
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> (NB: This isn't much use because defined functions and classes are in
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> their own code objects stored as constants - they're still accessible,
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> in code.co_consts, but this code doesn't go looking for them)
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>
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> > TIA
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> >
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> > /B
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> >
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> > Bruno Mattarollo <bruno at gaiasur.com.ar>
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> > ... proud to be a PSA member <http://www.python.org/psa>
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>
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> Good luck!
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>
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> Michael
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--
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*****************************************************************************
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S. Hoon Yoon (Quant) Merrill Lynch Equity Trading,
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yelled at yahoo.com hoon at bigfoot.com(w)
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"Miracle is always only few standard deviations away, but so is
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catastrophe."
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* Expressed opinions are often my own, but NOT my employer's.
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"I feel like a fugitive from the law of averages." Mauldin
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*****************************************************************************
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