1 """Codec for quoted-printable encoding.

     2 

     3 Like base64 and rot13, this returns Python strings, not Unicode.

     4 """

     5 

     6 import codecs, quopri

     7 try:

     8     from cStringIO import StringIO

     9 except ImportError:

    10     from StringIO import StringIO

    11 

    12 def quopri_encode(input, errors='strict'):

    13     """Encode the input, returning a tuple (output object, length consumed).

    14 

    15     errors defines the error handling to apply. It defaults to

    16     'strict' handling which is the only currently supported

    17     error handling for this codec.

    18 

    19     """

    20     assert errors == 'strict'

    21     # using str() because of cStringIO's Unicode undesired Unicode behavior.

    22     f = StringIO(str(input))

    23     g = StringIO()

    24     quopri.encode(f, g, 1)

    25     output = g.getvalue()

    26     return (output, len(input))

    27 

    28 def quopri_decode(input, errors='strict'):

    29     """Decode the input, returning a tuple (output object, length consumed).

    30 

    31     errors defines the error handling to apply. It defaults to

    32     'strict' handling which is the only currently supported

    33     error handling for this codec.

    34 

    35     """

    36     assert errors == 'strict'

    37     f = StringIO(str(input))

    38     g = StringIO()

    39     quopri.decode(f, g)

    40     output = g.getvalue()

    41     return (output, len(input))

    42 

    43 class Codec(codecs.Codec):

    44 

    45     def encode(self, input,errors='strict'):

    46         return quopri_encode(input,errors)

    47     def decode(self, input,errors='strict'):

    48         return quopri_decode(input,errors)

    49 

    50 class IncrementalEncoder(codecs.IncrementalEncoder):

    51     def encode(self, input, final=False):

    52         return quopri_encode(input, self.errors)[0]

    53 

    54 class IncrementalDecoder(codecs.IncrementalDecoder):

    55     def decode(self, input, final=False):

    56         return quopri_decode(input, self.errors)[0]

    57 

    58 class StreamWriter(Codec, codecs.StreamWriter):

    59     pass

    60 

    61 class StreamReader(Codec,codecs.StreamReader):

    62     pass

    63 

    64 # encodings module API

    65 

    66 def getregentry():

    67     return codecs.CodecInfo(

    68         name='quopri',

    69         encode=quopri_encode,

    70         decode=quopri_decode,

    71         incrementalencoder=IncrementalEncoder,

    72         incrementaldecoder=IncrementalDecoder,

    73         streamwriter=StreamWriter,

    74         streamreader=StreamReader,

    75     )