Viewing file:  hash.py (1.29 KB) -rw-r--r--
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import struct
import os
import gio
SIZE_ERROR = -1
SEEK_ERROR = -2
def hashFile(name):
""" FIXME Need to handle exceptions !! """
longlongformat = 'q' # long long
bytesize = struct.calcsize(longlongformat)
fp = gio.File(name)
filesize = fp.query_info('standard::size', 0).get_attribute_uint64('standard::size')
hash = filesize
if filesize < 65536 * 2:
return SIZE_ERROR, 0
data = fp.read()
if data.can_seek() != True:
return SEEK_ERROR, 0
for x in range(65536/bytesize):
buffer = data.read(bytesize)
(l_value,)= struct.unpack(longlongformat, buffer)
hash += l_value
hash = hash & 0xFFFFFFFFFFFFFFFF #to remain as 64bit number
if data.seek(max(0,filesize-65536),1) != True:
return SEEK_ERROR, 0
for x in range(65536/bytesize):
buffer = data.read(bytesize)
(l_value,)= struct.unpack(longlongformat, buffer)
hash += l_value
hash = hash & 0xFFFFFFFFFFFFFFFF
data.close()
returnedhash = "%016x" % hash
return returnedhash, filesize
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