change ipv4 representation from int to bytes in many places.
replace homegrown bin<->text routines with addrconv for ipv4.
Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
builtin function, sum, is much faster than for loop.
The result on my machine is as follows
> def main():
> from timeit import timeit
> data = bytearray().zfill(1500)
> print 'new=', timeit(lambda : checksum(data), number=1000)
> print 'old=', timeit(lambda : checksum_old(data), number=1000)
>
> new= 0.00800108909607
> old= 0.266770124435
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
