Created
December 28, 2011 17:43
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Calculate the checksum of a file
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| #!/usr/bin/env python | |
| ''' | |
| Per's SFV is a simple Simple File Verificator that you can use to | |
| verify that a file has not changed. | |
| Copyright (C) 2006 Per Myren <per.myren@gmail.com> | |
| Distributed under the GPL v2 | |
| modified by jason moiron to remove wx cruft and to allow file objects | |
| as arguments to CheckSum() | |
| usage: | |
| CheckSum(file_or_filename).getfilecrc() | |
| ''' | |
| import zlib, md5, struct, binascii, os | |
| class CRC32: | |
| def __init__(self, s=''): | |
| self.value = zlib.crc32(s) | |
| def update(self, s): | |
| self.value = zlib.crc32(s, self.value) | |
| def digest(self): | |
| return struct.pack('>I',self.value) | |
| class CheckSum: | |
| def __init__(self, filename): | |
| self.filename = filename | |
| def _getCheckSum(self, filename, checksumtype): | |
| try: | |
| if isinstance(filename, file): | |
| f = filename | |
| elif isinstance(filename, str): | |
| f = file(filename, 'rb') | |
| while True: | |
| x = f.read(65536) | |
| if not x: | |
| f.close() | |
| return checksumtype.digest() | |
| checksumtype.update(x) | |
| except (IOError, OSError): | |
| return "No such file" | |
| def getfilemd5(self): | |
| return binascii.hexlify(self._getCheckSum(self.filename, md5.new())) | |
| def getfilecrc(self): | |
| return binascii.hexlify(self._getCheckSum(self.filename, CRC32())) |
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