It is always good to ask yourself a question.
I had forgooten about the reduce function
I guess this implementation
from numpy import *
def compl_add_uint16(a, b):
c = a + b
c += c >> 16
return c & 0xFFFF
def compl_one_checksum(uint16s):
return reduce(compl_add_uint16, uint16s, 0x0000)
is somewhat better?
But is it the best way to do it with numpy?
In [2]: hex(compl_add_uint16(0xF0F0, 0x0F0F))
Out[2]: '0xffff'
In [3]: hex(compl_add_uint16(0xFFFF, 0x0001))
Out[3]: '0x1'
In [5]: hex(compl_one_checksum(array([], dtype=uint16)))
Out[5]: '0x0'
In [6]: hex(compl_one_checksum(array([0xF0F0, 0x0F0F, 0x0001],
dtype=uint16)))
Out[6]: '0x1L'
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