Here are a couple of functions that I feel stupid for having written.
They work, and they're pretty straightforward; it's just that I feel like
I must be missing an easier way to do this...
def net_to_int(numstring):
"""Convert a big-endian binary number, in the form of a string of
arbitrary length, to a native int.
"""
num = 0
for i in numstring:
num *= 256
num += ord(i)
return num
def int_to_net(num):
"""Convert a native int to a four-byte big-endian number, in the form
of a string.
"""
numstring = ''
for i in xrange(4):
numstring = chr(num % 256) + numstring
num /= 256
return numstring
The situation: I'm getting a four-byte packet from a socket that consists
of a big-endian 32-bit integer. (It specifies the length of the data that
follows.) I have to send the same thing in reply. send() and recv() work
with strings... I'm familiar with ntohl() and htonl(), but those expect/
return integers.
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09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0 -- pass it on
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