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#!/usr/bin/env python3
#
# adapted from proquints <https://arxiv.org/html/0901.4016>
import argparse
def _char_list_to_dict(char_list):
return {c: k for (c, k) in zip(char_list, range(len(char_list)))}
UINT_TO_CONSONANT = 'bdfghjklmnprstvz'
UINT_TO_VOWEL = 'aiou'
CONSONANT_TO_UINT = _char_list_to_dict(UINT_TO_CONSONANT)
VOWEL_TO_UINT = _char_list_to_dict(UINT_TO_VOWEL)
MASK_LAST4 = 0xF
MASK_LAST2 = 0x3
CHARS_PER_CHUNK = 5
def _uint16_to_roun(uint16_val):
val = uint16_val
res = ['?']*CHARS_PER_CHUNK
for i in range(CHARS_PER_CHUNK):
if i&1:
res[-i - 1] = UINT_TO_VOWEL[val & MASK_LAST2]
val >>= 2
else:
res[-i - 1] = UINT_TO_CONSONANT[val & MASK_LAST4]
val >>= 4
return ''.join(res)
def uint_to_roun(uint_val, separator='-'):
"""Convert 32-bit integer value into corresponding roun string identifier.
>>> uint_to_roun(0x7F000001, '-')
lusab-babad
:param uint_val: 32-bit integer value to encode
:param separator: string to separate character rounets
:return: roun string identifier
"""
if uint_val < 0 or uint_val > 0xFFFFFFFF:
raise ValueError('uint_val should be in range 0-0xFFFFFFFF')
return _uint16_to_roun(uint_val >> 16) + \
separator + \
_uint16_to_roun(uint_val)
def roun_to_uint(roun):
"""Convert roun string identifier into corresponding 32-bit integer value.
>>> hex(roun_to_uint('lusab-babad'))
'0x7F000001'
:param roun: roun string identifier to decode
:return: 32-bit integer representation of the roun encoded value
"""
nchar = len(roun)
if nchar < 10 or nchar > 11:
raise ValueError('roun should be in form of two rounets + optional separator')
res = 0
for i, c in enumerate(roun):
mag = CONSONANT_TO_UINT.get(c)
if mag is not None:
res <<= 4
res += mag
else:
mag = VOWEL_TO_UINT.get(c)
if mag is not None:
res <<= 2
res += mag
elif i != 5:
raise ValueError('bad roun format')
return res
def ip2uint_str(ipv4_str):
"""Convert IPv4 string to 32-bit integer value"""
parts = ipv4_str.split('.')
if len(parts) != 4:
raise ValueError('Expected IPv4 address in form A.B.C.D, got {}'.
format(ipv4_str))
ip = [0]*4
for i, part in enumerate(parts):
try:
int_part = int(part)
except ValueError:
raise ValueError('Part {} of IPv4 address is not an integer'.
format(i))
if int_part < 0 or int_part > 255:
raise ValueError('Part {} of IPv4 address is not in range 0-255'.
format(i))
ip[i] = int_part
return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3]
def uint_to_ip_str(uint_val):
"Covert 32-bit integer value to IPv4 string"
return '{}.{}.{}.{}'.format(
(uint_val >> 24)&0xFF,
(uint_val >> 16)&0xFF,
(uint_val >> 8)&0xFF,
uint_val&0xFF)
def uint_to_roun_str(uint_str, separator='-'):
return uint_to_roun(int(uint_str), separator)
def roun_to_uint_str(roun):
return str(roun_to_uint(roun))
def hex2roun_str(hex_str, separator='-'):
return uint_to_roun(int(hex_str, 16), separator)
def roun2hex_str(roun):
return hex(roun_to_uint(roun))
def convert(str_val, target=None):
"""Convert between roun, integer, hex or IPv4 string representations.
Tries to guess the representation from input.
:param str_val: input representation (string)
:return: output representation (string)
"""
if target is not None and target not in {'uint', 'hex', 'ip'}:
raise ValueError('Convert target should be one of: uint, hex, ip')
if target == 'uint':
return roun_to_uint_str(str_val)
if target == 'hex':
return roun2hex_str(str_val)
if target == 'ip':
return uint_to_ip_str(roun_to_uint(str_val))
# try to guess the representation
try:
return roun_to_uint_str(str_val)
except ValueError:
pass
try:
return uint_to_roun_str(str_val)
except ValueError:
pass
try:
return hex2roun_str(str_val)
except ValueError:
pass
try:
return uint_to_roun_str(ip2uint_str(str_val))
except ValueError:
pass
raise ValueError('Unrecognized input format: {}'.format(str_val))
if __name__ == '__main__':
desc = 'Convert between [integer, hexadecimal, IPv4 address] <-> roun representations. '
parser = argparse.ArgumentParser(description=desc)
parser.add_argument('-n', '--uint', action='store_true',
help='convert from roun to 32-bit integer', required=False)
parser.add_argument('-x', '--hex', action='store_true',
help='convert from roun to hexadecimal', required=False)
parser.add_argument('-i', '--ip', action='store_true',
help='convert from roun to IPv4', required=False)
parser.add_argument('val', nargs='?', type=str, default=None,
help='value to convert (if not specified, ' \
'IP address of the current host is printed)')
args = parser.parse_args()
target = None
if args.uint:
target = 'uint'
elif args.hex:
target = 'hex'
elif args.ip:
target = 'ip'
res = convert(args.val, target)
print('{}'.format(res))
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