1#!/usr/local/bin/python-legacy
2
3# Copyright 1994 by Lance Ellinghouse
4# Cathedral City, California Republic, United States of America.
5#                        All Rights Reserved
6# Permission to use, copy, modify, and distribute this software and its
7# documentation for any purpose and without fee is hereby granted,
8# provided that the above copyright notice appear in all copies and that
9# both that copyright notice and this permission notice appear in
10# supporting documentation, and that the name of Lance Ellinghouse
11# not be used in advertising or publicity pertaining to distribution
12# of the software without specific, written prior permission.
13# LANCE ELLINGHOUSE DISCLAIMS ALL WARRANTIES WITH REGARD TO
14# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
15# FITNESS, IN NO EVENT SHALL LANCE ELLINGHOUSE CENTRUM BE LIABLE
16# FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
19# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20#
21# Modified by Jack Jansen, CWI, July 1995:
22# - Use binascii module to do the actual line-by-line conversion
23#   between ascii and binary. This results in a 1000-fold speedup. The C
24#   version is still 5 times faster, though.
25# - Arguments more compliant with python standard
26
27"""Implementation of the UUencode and UUdecode functions.
28
29encode(in_file, out_file [,name, mode])
30decode(in_file [, out_file, mode])
31"""
32
33import binascii
34import os
35import sys
36
37__all__ = ["Error", "encode", "decode"]
38
39class Error(Exception):
40    pass
41
42def encode(in_file, out_file, name=None, mode=None):
43    """Uuencode file"""
44    #
45    # If in_file is a pathname open it and change defaults
46    #
47    opened_files = []
48    try:
49        if in_file == '-':
50            in_file = sys.stdin
51        elif isinstance(in_file, basestring):
52            if name is None:
53                name = os.path.basename(in_file)
54            if mode is None:
55                try:
56                    mode = os.stat(in_file).st_mode
57                except AttributeError:
58                    pass
59            in_file = open(in_file, 'rb')
60            opened_files.append(in_file)
61        #
62        # Open out_file if it is a pathname
63        #
64        if out_file == '-':
65            out_file = sys.stdout
66        elif isinstance(out_file, basestring):
67            out_file = open(out_file, 'wb')
68            opened_files.append(out_file)
69        #
70        # Set defaults for name and mode
71        #
72        if name is None:
73            name = '-'
74        if mode is None:
75            mode = 0666
76
77        #
78        # Remove newline chars from name
79        #
80        name = name.replace('\n','\\n')
81        name = name.replace('\r','\\r')
82
83        #
84        # Write the data
85        #
86        out_file.write('begin %o %s\n' % ((mode&0777),name))
87        data = in_file.read(45)
88        while len(data) > 0:
89            out_file.write(binascii.b2a_uu(data))
90            data = in_file.read(45)
91        out_file.write(' \nend\n')
92    finally:
93        for f in opened_files:
94            f.close()
95
96
97def decode(in_file, out_file=None, mode=None, quiet=0):
98    """Decode uuencoded file"""
99    #
100    # Open the input file, if needed.
101    #
102    opened_files = []
103    if in_file == '-':
104        in_file = sys.stdin
105    elif isinstance(in_file, basestring):
106        in_file = open(in_file)
107        opened_files.append(in_file)
108    try:
109        #
110        # Read until a begin is encountered or we've exhausted the file
111        #
112        while True:
113            hdr = in_file.readline()
114            if not hdr:
115                raise Error('No valid begin line found in input file')
116            if not hdr.startswith('begin'):
117                continue
118            hdrfields = hdr.split(' ', 2)
119            if len(hdrfields) == 3 and hdrfields[0] == 'begin':
120                try:
121                    int(hdrfields[1], 8)
122                    break
123                except ValueError:
124                    pass
125        if out_file is None:
126            out_file = hdrfields[2].rstrip()
127            if os.path.exists(out_file):
128                raise Error('Cannot overwrite existing file: %s' % out_file)
129        if mode is None:
130            mode = int(hdrfields[1], 8)
131        #
132        # Open the output file
133        #
134        if out_file == '-':
135            out_file = sys.stdout
136        elif isinstance(out_file, basestring):
137            fp = open(out_file, 'wb')
138            try:
139                os.path.chmod(out_file, mode)
140            except AttributeError:
141                pass
142            out_file = fp
143            opened_files.append(out_file)
144        #
145        # Main decoding loop
146        #
147        s = in_file.readline()
148        while s and s.strip() != 'end':
149            try:
150                data = binascii.a2b_uu(s)
151            except binascii.Error, v:
152                # Workaround for broken uuencoders by /Fredrik Lundh
153                nbytes = (((ord(s[0])-32) & 63) * 4 + 5) // 3
154                data = binascii.a2b_uu(s[:nbytes])
155                if not quiet:
156                    sys.stderr.write("Warning: %s\n" % v)
157            out_file.write(data)
158            s = in_file.readline()
159        if not s:
160            raise Error('Truncated input file')
161    finally:
162        for f in opened_files:
163            f.close()
164
165def test():
166    """uuencode/uudecode main program"""
167
168    import optparse
169    parser = optparse.OptionParser(usage='usage: %prog [-d] [-t] [input [output]]')
170    parser.add_option('-d', '--decode', dest='decode', help='Decode (instead of encode)?', default=False, action='store_true')
171    parser.add_option('-t', '--text', dest='text', help='data is text, encoded format unix-compatible text?', default=False, action='store_true')
172
173    (options, args) = parser.parse_args()
174    if len(args) > 2:
175        parser.error('incorrect number of arguments')
176        sys.exit(1)
177
178    input = sys.stdin
179    output = sys.stdout
180    if len(args) > 0:
181        input = args[0]
182    if len(args) > 1:
183        output = args[1]
184
185    if options.decode:
186        if options.text:
187            if isinstance(output, basestring):
188                output = open(output, 'w')
189            else:
190                print sys.argv[0], ': cannot do -t to stdout'
191                sys.exit(1)
192        decode(input, output)
193    else:
194        if options.text:
195            if isinstance(input, basestring):
196                input = open(input, 'r')
197            else:
198                print sys.argv[0], ': cannot do -t from stdin'
199                sys.exit(1)
200        encode(input, output)
201
202if __name__ == '__main__':
203    test()
204