58 lines
1.8 KiB
Python
58 lines
1.8 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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import struct
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import os
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def hash_file(filename):
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"""This function is taken from:
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http://trac.opensubtitles.org/projects/opensubtitles/wiki/HashSourceCodes
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and is licensed under the GPL."""
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longlongformat = 'q' # long long
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bytesize = struct.calcsize(longlongformat)
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f = open(filename, "rb")
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filesize = os.path.getsize(filename)
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hash_value = filesize
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if filesize < 65536 * 2:
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raise Exception("SizeError: size is %d, should be > 132K..." % filesize)
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for x in range(65536 / bytesize):
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buf = f.read(bytesize)
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(l_value,) = struct.unpack(longlongformat, buf)
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hash_value += l_value
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hash_value = hash_value & 0xFFFFFFFFFFFFFFFF #to remain as 64bit number
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f.seek(max(0, filesize - 65536), 0)
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for x in range(65536 / bytesize):
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buf = f.read(bytesize)
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(l_value,) = struct.unpack(longlongformat, buf)
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hash_value += l_value
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hash_value = hash_value & 0xFFFFFFFFFFFFFFFF
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f.close()
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return "%016x" % hash_value
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