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65 lines
2 KiB
Python
65 lines
2 KiB
Python
#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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#
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# GuessIt - A library for guessing information from filenames
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# Copyright (c) 2011 Nicolas Wack <wackou@gmail.com>
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#
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# GuessIt is free software; you can redistribute it and/or modify it under
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# the terms of the Lesser GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# GuessIt is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# Lesser GNU General Public License for more details.
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#
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# You should have received a copy of the Lesser GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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from __future__ import unicode_literals
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from guessit import s, to_hex
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import hashlib
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import os.path
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def hash_file(filename):
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"""Returns the ed2k hash of a given file.
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>>> s(hash_file('tests/dummy.srt'))
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'ed2k://|file|dummy.srt|44|1CA0B9DED3473B926AA93A0A546138BB|/'
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"""
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return 'ed2k://|file|%s|%d|%s|/' % (os.path.basename(filename),
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os.path.getsize(filename),
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hash_filehash(filename).upper())
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def hash_filehash(filename):
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"""Returns the ed2k hash of a given file.
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This function is taken from:
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http://www.radicand.org/blog/orz/2010/2/21/edonkey2000-hash-in-python/
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"""
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md4 = hashlib.new('md4').copy
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def gen(f):
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while True:
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x = f.read(9728000)
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if x:
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yield x
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else:
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return
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def md4_hash(data):
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m = md4()
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m.update(data)
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return m
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with open(filename, 'rb') as f:
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a = gen(f)
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hashes = [md4_hash(data).digest() for data in a]
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if len(hashes) == 1:
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return to_hex(hashes[0])
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else:
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return md4_hash(reduce(lambda a, d: a + d, hashes, "")).hexd
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