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@mursts
Created March 30, 2012 06:12
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Flickrの短縮URLを作成
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import sys
import re
class Base58:
def __init__(self):
self._CHARS = '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ'
self._CHAR_NUM = len(self._CHARS)
def _is_numeric(self, num):
matcher = re.compile(r'^[\d]*$')
return matcher.match(num)
def encode(self, value):
if self._is_numeric(value) is None:
return ''
encoded = ''
value = int(value)
while value >= self._CHAR_NUM:
div, mod = divmod(value, self._CHAR_NUM)
encoded = self._CHARS[mod] + encoded
value = div
return self._CHARS[value] + encoded
def decode(self, value):
decoded = 0
multi = 1
if value == '':
return ''
for v in reversed(value):
decoded += multi * self._CHARS.index(v)
multi *= self._CHAR_NUM
return decoded
if __name__ == '__main__':
args = sys.argv
if len(args) < 2:
print 'Usage: python {0} value'.format(args[0])
sys.exit()
print 'before:{0}'.format(args[1])
b58 = Base58()
encoded = b58.encode(args[1])
print 'encoded:{0}'.format(encoded)
print 'decoded:{0}'.format(b58.decode(encoded))
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