57 lines
1.8 KiB
Python
57 lines
1.8 KiB
Python
#-----------------------------------------------------------------------------
|
|
# Copyright (c) 2008-2012, David P. D. Moss. All rights reserved.
|
|
#
|
|
# Released under the BSD license. See the LICENSE file for details.
|
|
#-----------------------------------------------------------------------------
|
|
"""A basic implementation of RFC 1924 ;-)"""
|
|
|
|
from netaddr.core import AddrFormatError
|
|
from netaddr.ip import IPAddress
|
|
|
|
from netaddr.compat import _zip
|
|
|
|
#-----------------------------------------------------------------------------
|
|
def chr_range(low, high):
|
|
"""Returns all characters between low and high chars."""
|
|
return [chr(i) for i in range(ord(low), ord(high)+1)]
|
|
|
|
#: Base 85 integer index to character lookup table.
|
|
BASE_85 = chr_range('0', '9') + chr_range('A', 'Z') + chr_range('a', 'z') + \
|
|
['!', '#', '$', '%', '&', '(',')', '*', '+', '-',';', '<', '=', '>',
|
|
'?', '@', '^', '_','`', '{', '|', '}', '~']
|
|
|
|
#: Base 85 digit to integer lookup table.
|
|
BASE_85_DICT = dict(_zip(BASE_85, range(0, 86)))
|
|
|
|
#-----------------------------------------------------------------------------
|
|
def ipv6_to_base85(addr):
|
|
"""Convert a regular IPv6 address to base 85."""
|
|
ip = IPAddress(addr)
|
|
int_val = int(ip)
|
|
|
|
remainder = []
|
|
while int_val > 0:
|
|
remainder.append(int_val % 85)
|
|
int_val //= 85
|
|
|
|
return ''.join([BASE_85[w] for w in reversed(remainder)])
|
|
|
|
#-----------------------------------------------------------------------------
|
|
def base85_to_ipv6(addr):
|
|
"""
|
|
Convert a base 85 IPv6 address to its hexadecimal format.
|
|
"""
|
|
tokens = list(addr)
|
|
|
|
if len(tokens) != 20:
|
|
raise AddrFormatError('Invalid base 85 IPv6 addess: %r' % addr)
|
|
|
|
result = 0
|
|
for i, num in enumerate(reversed(tokens)):
|
|
num = BASE_85_DICT[num]
|
|
result += (num * 85 ** i)
|
|
|
|
ip = IPAddress(result, 6)
|
|
|
|
return str(ip)
|