""" Python 'uu_codec' Codec - UU content transfer encoding     Unlike most of the other codecs which target Unicode, this codec    will return Python string objects for both encode and decode.     Written by Marc-Andre Lemburg (mal@lemburg.com). Some details were    adapted from uu.py which was written by Lance Ellinghouse and    modified by Jack Jansen and Fredrik Lundh. """import codecs, binascii ### Codec APIs def uu_encode(input,errors='strict',filename='<data>',mode=0666):     """ Encodes the object input and returns a tuple (output        object, length consumed).         errors defines the error handling to apply. It defaults to        'strict' handling which is the only currently supported        error handling for this codec.     """    assert errors == 'strict'    from cStringIO import StringIO    from binascii import b2a_uu    infile = StringIO(input)    outfile = StringIO()    read = infile.read    write = outfile.write     # Encode    write('begin %o %s\n' % (mode & 0777, filename))    chunk = read(45)    while chunk:        write(b2a_uu(chunk))        chunk = read(45)    write(' \nend\n')     return (outfile.getvalue(), len(input)) def uu_decode(input,errors='strict'):     """ Decodes the object input and returns a tuple (output        object, length consumed).         input must be an object which provides the bf_getreadbuf        buffer slot. Python strings, buffer objects and memory        mapped files are examples of objects providing this slot.         errors defines the error handling to apply. It defaults to        'strict' handling which is the only currently supported        error handling for this codec.         Note: filename and file mode information in the input data is        ignored.     """    assert errors == 'strict'    from cStringIO import StringIO    from binascii import a2b_uu    infile = StringIO(input)    outfile = StringIO()    readline = infile.readline    write = outfile.write     # Find start of encoded data    while 1:        s = readline()        if not s:            raise ValueError, 'Missing "begin" line in input data'        if s[:5] == 'begin':            break     # Decode    while 1:        s = readline()        if not s or \           s == 'end\n':            break        try:            data = a2b_uu(s)        except binascii.Error, v:            # Workaround for broken uuencoders by /Fredrik Lundh            nbytes = (((ord(s[0])-32) & 63) * 4 + 5) / 3            data = a2b_uu(s[:nbytes])            #sys.stderr.write("Warning: %s\n" % str(v))        write(data)    if not s:        raise ValueError, 'Truncated input data'     return (outfile.getvalue(), len(input)) class Codec(codecs.Codec):     def encode(self,input,errors='strict'):        return uu_encode(input,errors)     def decode(self,input,errors='strict'):        return uu_decode(input,errors) class IncrementalEncoder(codecs.IncrementalEncoder):    def encode(self, input, final=False):        return uu_encode(input, self.errors)[0] class IncrementalDecoder(codecs.IncrementalDecoder):    def decode(self, input, final=False):        return uu_decode(input, self.errors)[0] class StreamWriter(Codec,codecs.StreamWriter):    pass class StreamReader(Codec,codecs.StreamReader):    pass ### encodings module API def getregentry():    return codecs.CodecInfo(        name='uu',        encode=uu_encode,        decode=uu_decode,        incrementalencoder=IncrementalEncoder,        incrementaldecoder=IncrementalDecoder,        streamreader=StreamReader,        streamwriter=StreamWriter,    )