Function decode_num

code-ch08/op.py:42–60

(element)

def decode_num(element):
    if element == b'':
        return 0
    # reverse for big endian
    big_endian = element[::-1]
    # top bit being 1 means it's negative
    if big_endian[0] & 0x80:
        negative = True
        result = big_endian[0] & 0x7f
    else:
        negative = False
        result = big_endian[0]
    for c in big_endian[1:]:
        result <<= 8
        result += c
    if negative:
        return -result
    else:
        return result


def op_0(stack):