moviegross.py 文件源码

def __get_f(self, s):
        i = 0
        t = ''
        l = string.ascii_uppercase + string.ascii_lowercase + string.digits + '+/'
        while i < len(s):
            try:
                c1 = l.index(s[i])
                c2 = l.index(s[i + 1])
                t += chr(c1 << 2 & 255 | c2 >> 4)
                c3 = l.index(s[i + 2])
                t += chr(c2 << 4 & 255 | c3 >> 2)
                c4 = l.index(s[i + 3])
                t += chr(c3 << 6 & 255 | c4)
                i += 4
            except:
                break

        return t