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import struct
import os
from gi.repository import Gio
SIZE_ERROR = -1
SEEK_ERROR = -2
def hash_file (name):
""" FIXME Need to handle exceptions !! """
longlongformat = 'q' # long long
bytesize = struct.calcsize (longlongformat)
file_to_hash = Gio.File.new_for_uri (name)
file_info = file_to_hash.query_info ('standard::size', 0, None)
filesize = file_info.get_attribute_uint64 ('standard::size')
file_hash = filesize
if filesize < 65536 * 2:
return SIZE_ERROR, 0
file_handle = open (file_to_hash.get_path (), "rb")
for _ in range(int(65536 / bytesize)):
buf = file_handle.read (bytesize)
(l_value,) = struct.unpack (longlongformat, buf)
file_hash += l_value
file_hash = file_hash & 0xFFFFFFFFFFFFFFFF #to remain as 64bit number
file_handle.seek (max (0, filesize - 65536), os.SEEK_SET)
if file_handle.tell() != max (0, filesize - 65536):
return SEEK_ERROR, 0
for _ in range(int(65536/bytesize)):
buf = file_handle.read (bytesize)
(l_value,) = struct.unpack (longlongformat, buf)
file_hash += l_value
file_hash = file_hash & 0xFFFFFFFFFFFFFFFF
file_handle.close ()
returnedhash = "%016x" % file_hash
return returnedhash, filesize
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