Lib/encodings/quopri_codec.py

   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     )