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"""Python 'uu_codec' Codec - UU content transfer encoding. This codec de/encodes from bytes to bytes. 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 import binascii from io import BytesIO ### Codec APIs def uu_encode(input, errors='strict', filename='<data>', mode=0o666): assert errors == 'strict' infile = BytesIO(input) outfile = BytesIO() read = infile.read write = outfile.write # Remove newline chars from filename filename = filename.replace('\n','\\n') filename = filename.replace('\r','\\r') # Encode write(('begin %o %s\n' % (mode & 0o777, filename)).encode('ascii')) chunk = read(45) while chunk: write(binascii.b2a_uu(chunk)) chunk = read(45) write(b' \nend\n') return (outfile.getvalue(), len(input)) def uu_decode(input, errors='strict'): assert errors == 'strict' infile = BytesIO(input) outfile = BytesIO() 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] == b'begin': break # Decode while True: s = readline() if not s or s == b'end\n': break try: data = binascii.a2b_uu(s) except binascii.Error as v: # Workaround for broken uuencoders by /Fredrik Lundh nbytes = (((s[0]-32) & 63) * 4 + 5) // 3 data = binascii.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): charbuffertype = bytes class StreamReader(Codec, codecs.StreamReader): charbuffertype = bytes ### 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, )