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Viewing changes to scripts/subtitle-couch/client/hashfile.py

  • Committer: swick at 2flub
  • Date: 2011-02-22 15:12:51 UTC
  • Revision ID: swick@2flub.org-20110222151251-nsjsh0yrn1nolqa2
Moving to REST

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scripts/subtitle-couch/client/hashfile.py
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import struct, os
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def hashFile(name): 
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      try: 
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                longlongformat = 'q'  # long long 
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                bytesize = struct.calcsize(longlongformat) 
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                f = open(name, "rb") 
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                filesize = os.path.getsize(name) 
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                hash = filesize 
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                if filesize < 65536 * 2: 
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                       return "SizeError" 
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                for x in range(65536/bytesize): 
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                        buffer = f.read(bytesize) 
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                        (l_value,)= struct.unpack(longlongformat, buffer)  
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                        hash += l_value 
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                        hash = hash & 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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                        buffer = f.read(bytesize) 
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                        (l_value,)= struct.unpack(longlongformat, buffer)  
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                        hash += l_value 
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                        hash = hash & 0xFFFFFFFFFFFFFFFF 
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                f.close() 
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                returnedhash =  "%016x" % hash 
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                return returnedhash 
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      except(IOError): 
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                return "IOError"
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