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abb02e5994
of tuple) that provides incremental decoders and encoders (a way to use stateful codecs without the stream API). Functions codecs.getincrementaldecoder() and codecs.getincrementalencoder() have been added.
128 lines
3.6 KiB
Python
128 lines
3.6 KiB
Python
""" Python 'uu_codec' Codec - UU content transfer encoding
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Unlike most of the other codecs which target Unicode, this codec
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will return Python string objects for both encode and decode.
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Written by Marc-Andre Lemburg (mal@lemburg.com). Some details were
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adapted from uu.py which was written by Lance Ellinghouse and
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modified by Jack Jansen and Fredrik Lundh.
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"""
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import codecs, binascii
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### Codec APIs
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def uu_encode(input,errors='strict',filename='<data>',mode=0666):
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""" Encodes the object input and returns a tuple (output
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object, length consumed).
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errors defines the error handling to apply. It defaults to
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'strict' handling which is the only currently supported
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error handling for this codec.
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"""
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assert errors == 'strict'
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from cStringIO import StringIO
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from binascii import b2a_uu
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infile = StringIO(input)
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outfile = StringIO()
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read = infile.read
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write = outfile.write
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# Encode
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write('begin %o %s\n' % (mode & 0777, filename))
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chunk = read(45)
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while chunk:
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write(b2a_uu(chunk))
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chunk = read(45)
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write(' \nend\n')
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return (outfile.getvalue(), len(input))
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def uu_decode(input,errors='strict'):
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""" Decodes the object input and returns a tuple (output
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object, length consumed).
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input must be an object which provides the bf_getreadbuf
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buffer slot. Python strings, buffer objects and memory
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mapped files are examples of objects providing this slot.
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errors defines the error handling to apply. It defaults to
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'strict' handling which is the only currently supported
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error handling for this codec.
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Note: filename and file mode information in the input data is
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ignored.
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"""
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assert errors == 'strict'
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from cStringIO import StringIO
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from binascii import a2b_uu
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infile = StringIO(input)
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outfile = StringIO()
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readline = infile.readline
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write = outfile.write
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# Find start of encoded data
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while 1:
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s = readline()
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if not s:
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raise ValueError, 'Missing "begin" line in input data'
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if s[:5] == 'begin':
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break
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# Decode
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while 1:
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s = readline()
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if not s or \
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s == 'end\n':
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break
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try:
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data = a2b_uu(s)
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except binascii.Error, v:
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# Workaround for broken uuencoders by /Fredrik Lundh
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nbytes = (((ord(s[0])-32) & 63) * 4 + 5) / 3
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data = a2b_uu(s[:nbytes])
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#sys.stderr.write("Warning: %s\n" % str(v))
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write(data)
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if not s:
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raise ValueError, 'Truncated input data'
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return (outfile.getvalue(), len(input))
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class Codec(codecs.Codec):
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def encode(self,input,errors='strict'):
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return uu_encode(input,errors)
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def decode(self,input,errors='strict'):
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return uu_decode(input,errors)
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class IncrementalEncoder(codecs.IncrementalEncoder):
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def encode(self, input, final=False):
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return uu_encode(input, errors)[0]
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class IncrementalDecoder(codecs.IncrementalDecoder):
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def decode(self, input, final=False):
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return uu_decode(input, errors)[0]
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class StreamWriter(Codec,codecs.StreamWriter):
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pass
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class StreamReader(Codec,codecs.StreamReader):
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pass
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### encodings module API
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def getregentry():
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return codecs.CodecInfo(
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name='uu',
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encode=uu_encode,
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decode=uu_decode,
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incrementalencoder=IncrementalEncoder,
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incrementaldecoder=IncrementalDecoder,
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streamreader=StreamReader,
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streamwriter=StreamWriter,
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)
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