def extract_from_offset(dna, offset, level=1):
result = ""
gen = (dna[i] for i in xrange(offset, len(dna)))
for l in xrange(level):
gen = consts(gen)
gen = nat(gen)
for c in gen:
if c == 255:
result += "<EoL>"
break
if c in character:
result += character[c]
else:
result += "<" + str(c) + ">"
return result
def get_value(dna, offset, type):
green_begin = dna.find(green_zone_marker)
assert(green_begin > 0)
start = green_begin + offset
end = start + sizeof[type]
print dna[start:end]
# ugly abuse of iterator-based nat()
iter = (b for b in dna[start:end])
nat_list = list(nat(b for b in iter))
assert(len(nat_list) == 1)
result = nat_list[0]
#assert(asnat(result, length=sizeof[type]) == dna[start:end])
return result
