ZipInfo holds filename as bytes. this causes mojibake for zip has sjis encoded string. 2nd byte position of dame-moji is normalized from \ to / incorrectly. this module intercept assignment to hold filename as unicode and handle zip better.

zipfile_extended_damemoji_for_py26.py

# extended zipfile module to handle sjis damemoji well.
from zipfile import *

def cp932_invert(cp932_path):
   from string import printable
   def fun(i):
       pred = i > 0 and cp932_path[i] == '/' and cp932_path[i-1] not in printable
       return '\\' if pred else cp932_path[i]
   lst = map(fun, range(len(cp932_path)))
   uni = ''.join(lst).decode('cp932').replace('\\', '/')
   return uni

def as_unicode_path(path):
   if type(path) is unicode:
       return path

   for enc in ['utf-8', 'sjis', 'cp932', 'euc-jp', 'iso-2022-jp']:
       try:
           return path.decode(enc)
       except:
           pass

   # assume cp932 encoding including dame-moji
   try:
       return cp932_invert(path)
   except:
       return path

def __setattr__(self, name, value):
    if name == 'filename':
        value = as_unicode_path(value)
    object.__setattr__(self, name, value)

ZipInfo.__setattr__ = __setattr__

def infolist(self):
    return filter(lambda info: info.filename[-1] != '/', self.filelist)
ZipFile.infolist = infolist

def namelist(self):
    return map(lambda info: info.filename, self.infolist())
ZipFile.namelist = namelist