projects / OpenSPARC-T2-SAM / blame
| Commit | Line | Data |
|---|---|---|
| 920dae64 AT |
1 | """ Python 'uu_codec' Codec - UU content transfer encoding |
| 2 | ||
| 3 | Unlike most of the other codecs which target Unicode, this codec | |
| 4 | will return Python string objects for both encode and decode. | |
| 5 | ||
| 6 | Written by Marc-Andre Lemburg (mal@lemburg.com). Some details were | |
| 7 | adapted from uu.py which was written by Lance Ellinghouse and | |
| 8 | modified by Jack Jansen and Fredrik Lundh. | |
| 9 | ||
| 10 | """ | |
| 11 | import codecs, binascii | |
| 12 | ||
| 13 | ### Codec APIs | |
| 14 | ||
| 15 | def uu_encode(input,errors='strict',filename='<data>',mode=0666): | |
| 16 | ||
| 17 | """ Encodes the object input and returns a tuple (output | |
| 18 | object, length consumed). | |
| 19 | ||
| 20 | errors defines the error handling to apply. It defaults to | |
| 21 | 'strict' handling which is the only currently supported | |
| 22 | error handling for this codec. | |
| 23 | ||
| 24 | """ | |
| 25 | assert errors == 'strict' | |
| 26 | from cStringIO import StringIO | |
| 27 | from binascii import b2a_uu | |
| 28 | infile = StringIO(input) | |
| 29 | outfile = StringIO() | |
| 30 | read = infile.read | |
| 31 | write = outfile.write | |
| 32 | ||
| 33 | # Encode | |
| 34 | write('begin %o %s\n' % (mode & 0777, filename)) | |
| 35 | chunk = read(45) | |
| 36 | while chunk: | |
| 37 | write(b2a_uu(chunk)) | |
| 38 | chunk = read(45) | |
| 39 | write(' \nend\n') | |
| 40 | ||
| 41 | return (outfile.getvalue(), len(input)) | |
| 42 | ||
| 43 | def uu_decode(input,errors='strict'): | |
| 44 | ||
| 45 | """ Decodes the object input and returns a tuple (output | |
| 46 | object, length consumed). | |
| 47 | ||
| 48 | input must be an object which provides the bf_getreadbuf | |
| 49 | buffer slot. Python strings, buffer objects and memory | |
| 50 | mapped files are examples of objects providing this slot. | |
| 51 | ||
| 52 | errors defines the error handling to apply. It defaults to | |
| 53 | 'strict' handling which is the only currently supported | |
| 54 | error handling for this codec. | |
| 55 | ||
| 56 | Note: filename and file mode information in the input data is | |
| 57 | ignored. | |
| 58 | ||
| 59 | """ | |
| 60 | assert errors == 'strict' | |
| 61 | from cStringIO import StringIO | |
| 62 | from binascii import a2b_uu | |
| 63 | infile = StringIO(input) | |
| 64 | outfile = StringIO() | |
| 65 | readline = infile.readline | |
| 66 | write = outfile.write | |
| 67 | ||
| 68 | # Find start of encoded data | |
| 69 | while 1: | |
| 70 | s = readline() | |
| 71 | if not s: | |
| 72 | raise ValueError, 'Missing "begin" line in input data' | |
| 73 | if s[:5] == 'begin': | |
| 74 | break | |
| 75 | ||
| 76 | # Decode | |
| 77 | while 1: | |
| 78 | s = readline() | |
| 79 | if not s or \ | |
| 80 | s == 'end\n': | |
| 81 | break | |
| 82 | try: | |
| 83 | data = a2b_uu(s) | |
| 84 | except binascii.Error, v: | |
| 85 | # Workaround for broken uuencoders by /Fredrik Lundh | |
| 86 | nbytes = (((ord(s[0])-32) & 63) * 4 + 5) / 3 | |
| 87 | data = a2b_uu(s[:nbytes]) | |
| 88 | #sys.stderr.write("Warning: %s\n" % str(v)) | |
| 89 | write(data) | |
| 90 | if not s: | |
| 91 | raise ValueError, 'Truncated input data' | |
| 92 | ||
| 93 | return (outfile.getvalue(), len(input)) | |
| 94 | ||
| 95 | class Codec(codecs.Codec): | |
| 96 | ||
| 97 | def encode(self,input,errors='strict'): | |
| 98 | return uu_encode(input,errors) | |
| 99 | def decode(self,input,errors='strict'): | |
| 100 | return uu_decode(input,errors) | |
| 101 | ||
| 102 | class StreamWriter(Codec,codecs.StreamWriter): | |
| 103 | pass | |
| 104 | ||
| 105 | class StreamReader(Codec,codecs.StreamReader): | |
| 106 | pass | |
| 107 | ||
| 108 | ### encodings module API | |
| 109 | ||
| 110 | def getregentry(): | |
| 111 | ||
| 112 | return (uu_encode,uu_decode,StreamReader,StreamWriter) |