bin.py

#!/usr/bin/env python
import fileinput, re, sys, binascii, struct

hexword = '([A-Fa-f0-9]{4})'
pattern = '%(hexword)s:' + 8*'\s*%(hexword)s'
pattern = pattern % locals()
write   = sys.stdout.write
unhex   = binascii.unhexlify
word    = lambda b: struct.unpack('!H', b)[0]

offset  = 0

for line in fileinput.input():
    match = re.match(pattern, line)
    if match:
        groups = match.groups()
        start  = word(unhex(groups[0]))
        data   = unhex(''.join(groups[1:]))

        write('\x00' * (start-offset))
        write(data)

        offset = start + len(data)