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1 | """ Python 'uu_codec' Codec - UU content transfer encoding\r |
2 | \r | |
3 | Unlike most of the other codecs which target Unicode, this codec\r | |
4 | will return Python string objects for both encode and decode.\r | |
5 | \r | |
6 | Written by Marc-Andre Lemburg (mal@lemburg.com). Some details were\r | |
7 | adapted from uu.py which was written by Lance Ellinghouse and\r | |
8 | modified by Jack Jansen and Fredrik Lundh.\r | |
9 | \r | |
10 | """\r | |
11 | import codecs, binascii\r | |
12 | \r | |
13 | ### Codec APIs\r | |
14 | \r | |
15 | def uu_encode(input,errors='strict',filename='<data>',mode=0666):\r | |
16 | \r | |
17 | """ Encodes the object input and returns a tuple (output\r | |
18 | object, length consumed).\r | |
19 | \r | |
20 | errors defines the error handling to apply. It defaults to\r | |
21 | 'strict' handling which is the only currently supported\r | |
22 | error handling for this codec.\r | |
23 | \r | |
24 | """\r | |
25 | assert errors == 'strict'\r | |
26 | from cStringIO import StringIO\r | |
27 | from binascii import b2a_uu\r | |
28 | # using str() because of cStringIO's Unicode undesired Unicode behavior.\r | |
29 | infile = StringIO(str(input))\r | |
30 | outfile = StringIO()\r | |
31 | read = infile.read\r | |
32 | write = outfile.write\r | |
33 | \r | |
34 | # Encode\r | |
35 | write('begin %o %s\n' % (mode & 0777, filename))\r | |
36 | chunk = read(45)\r | |
37 | while chunk:\r | |
38 | write(b2a_uu(chunk))\r | |
39 | chunk = read(45)\r | |
40 | write(' \nend\n')\r | |
41 | \r | |
42 | return (outfile.getvalue(), len(input))\r | |
43 | \r | |
44 | def uu_decode(input,errors='strict'):\r | |
45 | \r | |
46 | """ Decodes the object input and returns a tuple (output\r | |
47 | object, length consumed).\r | |
48 | \r | |
49 | input must be an object which provides the bf_getreadbuf\r | |
50 | buffer slot. Python strings, buffer objects and memory\r | |
51 | mapped files are examples of objects providing this slot.\r | |
52 | \r | |
53 | errors defines the error handling to apply. It defaults to\r | |
54 | 'strict' handling which is the only currently supported\r | |
55 | error handling for this codec.\r | |
56 | \r | |
57 | Note: filename and file mode information in the input data is\r | |
58 | ignored.\r | |
59 | \r | |
60 | """\r | |
61 | assert errors == 'strict'\r | |
62 | from cStringIO import StringIO\r | |
63 | from binascii import a2b_uu\r | |
64 | infile = StringIO(str(input))\r | |
65 | outfile = StringIO()\r | |
66 | readline = infile.readline\r | |
67 | write = outfile.write\r | |
68 | \r | |
69 | # Find start of encoded data\r | |
70 | while 1:\r | |
71 | s = readline()\r | |
72 | if not s:\r | |
73 | raise ValueError, 'Missing "begin" line in input data'\r | |
74 | if s[:5] == 'begin':\r | |
75 | break\r | |
76 | \r | |
77 | # Decode\r | |
78 | while 1:\r | |
79 | s = readline()\r | |
80 | if not s or \\r | |
81 | s == 'end\n':\r | |
82 | break\r | |
83 | try:\r | |
84 | data = a2b_uu(s)\r | |
85 | except binascii.Error, v:\r | |
86 | # Workaround for broken uuencoders by /Fredrik Lundh\r | |
87 | nbytes = (((ord(s[0])-32) & 63) * 4 + 5) // 3\r | |
88 | data = a2b_uu(s[:nbytes])\r | |
89 | #sys.stderr.write("Warning: %s\n" % str(v))\r | |
90 | write(data)\r | |
91 | if not s:\r | |
92 | raise ValueError, 'Truncated input data'\r | |
93 | \r | |
94 | return (outfile.getvalue(), len(input))\r | |
95 | \r | |
96 | class Codec(codecs.Codec):\r | |
97 | \r | |
98 | def encode(self,input,errors='strict'):\r | |
99 | return uu_encode(input,errors)\r | |
100 | \r | |
101 | def decode(self,input,errors='strict'):\r | |
102 | return uu_decode(input,errors)\r | |
103 | \r | |
104 | class IncrementalEncoder(codecs.IncrementalEncoder):\r | |
105 | def encode(self, input, final=False):\r | |
106 | return uu_encode(input, self.errors)[0]\r | |
107 | \r | |
108 | class IncrementalDecoder(codecs.IncrementalDecoder):\r | |
109 | def decode(self, input, final=False):\r | |
110 | return uu_decode(input, self.errors)[0]\r | |
111 | \r | |
112 | class StreamWriter(Codec,codecs.StreamWriter):\r | |
113 | pass\r | |
114 | \r | |
115 | class StreamReader(Codec,codecs.StreamReader):\r | |
116 | pass\r | |
117 | \r | |
118 | ### encodings module API\r | |
119 | \r | |
120 | def getregentry():\r | |
121 | return codecs.CodecInfo(\r | |
122 | name='uu',\r | |
123 | encode=uu_encode,\r | |
124 | decode=uu_decode,\r | |
125 | incrementalencoder=IncrementalEncoder,\r | |
126 | incrementaldecoder=IncrementalDecoder,\r | |
127 | streamreader=StreamReader,\r | |
128 | streamwriter=StreamWriter,\r | |
129 | )\r |