summaryrefslogtreecommitdiffstats
path: root/Lib/uu.py
blob: 334d436cd62233aeab0bf98f1c259052c3a73899 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
#! /usr/bin/env python

# Copyright 1994 by Lance Ellinghouse
# Cathedral City, California Republic, United States of America.
#                        All Rights Reserved
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose and without fee is hereby granted,
# provided that the above copyright notice appear in all copies and that
# both that copyright notice and this permission notice appear in
# supporting documentation, and that the name of Lance Ellinghouse
# not be used in advertising or publicity pertaining to distribution
# of the software without specific, written prior permission.
# LANCE ELLINGHOUSE DISCLAIMS ALL WARRANTIES WITH REGARD TO
# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
# FITNESS, IN NO EVENT SHALL LANCE ELLINGHOUSE CENTRUM BE LIABLE
# FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# Modified by Jack Jansen, CWI, July 1995:
# - Use binascii module to do the actual line-by-line conversion
#   between ascii and binary. This results in a 1000-fold speedup. The C
#   version is still 5 times faster, though.
# - Arguments more compliant with python standard

"""Implementation of the UUencode and UUdecode functions.

encode(in_file, out_file [,name, mode])
decode(in_file [, out_file, mode])
"""

import binascii
import os
import sys

__all__ = ["Error", "encode", "decode"]

class Error(Exception):
    pass

def encode(in_file, out_file, name=None, mode=None):
    """Uuencode file"""
    #
    # If in_file is a pathname open it and change defaults
    #
    if in_file == '-':
        in_file = sys.stdin
    elif type(in_file) == type(''):
        if name is None:
            name = os.path.basename(in_file)
        if mode is None:
            try:
                mode = os.stat(in_file)[0]
            except AttributeError:
                pass
        in_file = open(in_file, 'rb')
    #
    # Open out_file if it is a pathname
    #
    if out_file == '-':
        out_file = sys.stdout
    elif type(out_file) == type(''):
        out_file = open(out_file, 'w')
    #
    # Set defaults for name and mode
    #
    if name is None:
        name = '-'
    if mode is None:
        mode = 0666
    #
    # Write the data
    #
    out_file.write('begin %o %s\n' % ((mode&0777),name))
    str = in_file.read(45)
    while len(str) > 0:
        out_file.write(binascii.b2a_uu(str))
        str = in_file.read(45)
    out_file.write(' \nend\n')


def decode(in_file, out_file=None, mode=None):
    """Decode uuencoded file"""
    #
    # Open the input file, if needed.
    #
    if in_file == '-':
        in_file = sys.stdin
    elif type(in_file) == type(''):
        in_file = open(in_file)
    #
    # Read until a begin is encountered or we've exhausted the file
    #
    while 1:
        hdr = in_file.readline()
        if not hdr:
            raise Error, 'No valid begin line found in input file'
        if hdr[:5] != 'begin':
            continue
        hdrfields = hdr.split(" ", 2)
        if len(hdrfields) == 3 and hdrfields[0] == 'begin':
            try:
                int(hdrfields[1], 8)
                break
            except ValueError:
                pass
    if out_file is None:
        out_file = hdrfields[2].rstrip()
    if mode is None:
        mode = int(hdrfields[1], 8)
    #
    # Open the output file
    #
    if out_file == '-':
        out_file = sys.stdout
    elif type(out_file) == type(''):
        fp = open(out_file, 'wb')
        try:
            os.path.chmod(out_file, mode)
        except AttributeError:
            pass
        out_file = fp
    #
    # Main decoding loop
    #
    s = in_file.readline()
    while s and s != 'end\n':
        try:
            data = binascii.a2b_uu(s)
        except binascii.Error, v:
            # Workaround for broken uuencoders by /Fredrik Lundh
            nbytes = (((ord(s[0])-32) & 63) * 4 + 5) / 3
            data = binascii.a2b_uu(s[:nbytes])
            sys.stderr.write("Warning: %s\n" % str(v))
        out_file.write(data)
        s = in_file.readline()
    if not str:
        raise Error, 'Truncated input file'

def test():
    """uuencode/uudecode main program"""
    import getopt

    dopt = 0
    topt = 0
    input = sys.stdin
    output = sys.stdout
    ok = 1
    try:
        optlist, args = getopt.getopt(sys.argv[1:], 'dt')
    except getopt.error:
        ok = 0
    if not ok or len(args) > 2:
        print 'Usage:', sys.argv[0], '[-d] [-t] [input [output]]'
        print ' -d: Decode (in stead of encode)'
        print ' -t: data is text, encoded format unix-compatible text'
        sys.exit(1)

    for o, a in optlist:
        if o == '-d': dopt = 1
        if o == '-t': topt = 1

    if len(args) > 0:
        input = args[0]
    if len(args) > 1:
        output = args[1]

    if dopt:
        if topt:
            if type(output) == type(''):
                output = open(output, 'w')
            else:
                print sys.argv[0], ': cannot do -t to stdout'
                sys.exit(1)
        decode(input, output)
    else:
        if topt:
            if type(input) == type(''):
                input = open(input, 'r')
            else:
                print sys.argv[0], ': cannot do -t from stdin'
                sys.exit(1)
        encode(input, output)

if __name__ == '__main__':
    test()