def _hash_from_file(self, fp, start, size, blockhash):
fp.seek(start)
block = readall(fp, size)
h = newhashlib(blockhash)
h.update(block.strip('\x00'))
return hexlify(h.digest())
def _pithos_hash(block, blockhash):
h = newhashlib(blockhash)
h.update(block.rstrip('\x00'))
return h.hexdigest()
