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+""" 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
+ # using str() because of cStringIO's Unicode undesired Unicode behavior.
+ infile = StringIO(str(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(str(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,
+ _is_text_encoding=False,
+ )