utils.py 文件源码

def encode_name(name, type, scope = None):
    """
    Perform first and second level encoding of name as specified in RFC 1001 (Section 4)
    """
    if name == '*':
        name = name + '\0' * 15
    elif len(name) > 15:
        name = name[:15] + chr(type)
    else:
        name = string.ljust(name, 15) + chr(type)

    def _do_first_level_encoding(m):
        s = ord(m.group(0))
        return string.uppercase[s >> 4] + string.uppercase[s & 0x0f]

    encoded_name = chr(len(name) * 2) + re.sub('.', _do_first_level_encoding, name)
    if scope:
        encoded_scope = ''
        for s in string.split(scope, '.'):
            encoded_scope = encoded_scope + chr(len(s)) + s
        return encoded_name + encoded_scope + '\0'
    else:
        return encoded_name + '\0'