1 #! /usr/bin/env python 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 29 encode(in_file, out_file [,name, mode]) 30 decode(in_file [, out_file, mode]) 31 """ 32 33 import binascii 34 import os 35 import sys 36 37 __all__ = ["Error", "encode", "decode"] 38 39 class Error(Exception): 40 pass 41 42 def 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 # Write the data 78 # 79 out_file.write('begin %o %s\n' % ((mode&0777),name)) 80 data = in_file.read(45) 81 while len(data) > 0: 82 out_file.write(binascii.b2a_uu(data)) 83 data = in_file.read(45) 84 out_file.write(' \nend\n') 85 finally: 86 for f in opened_files: 87 f.close() 88 89 90 def decode(in_file, out_file=None, mode=None, quiet=0): 91 """Decode uuencoded file""" 92 # 93 # Open the input file, if needed. 94 # 95 opened_files = [] 96 if in_file == '-': 97 in_file = sys.stdin 98 elif isinstance(in_file, basestring): 99 in_file = open(in_file) 100 opened_files.append(in_file) 101 try: 102 # 103 # Read until a begin is encountered or we've exhausted the file 104 # 105 while True: 106 hdr = in_file.readline() 107 if not hdr: 108 raise Error('No valid begin line found in input file') 109 if not hdr.startswith('begin'): 110 continue 111 hdrfields = hdr.split(' ', 2) 112 if len(hdrfields) == 3 and hdrfields[0] == 'begin': 113 try: 114 int(hdrfields[1], 8) 115 break 116 except ValueError: 117 pass 118 if out_file is None: 119 out_file = hdrfields[2].rstrip() 120 if os.path.exists(out_file): 121 raise Error('Cannot overwrite existing file: %s' % out_file) 122 if mode is None: 123 mode = int(hdrfields[1], 8) 124 # 125 # Open the output file 126 # 127 if out_file == '-': 128 out_file = sys.stdout 129 elif isinstance(out_file, basestring): 130 fp = open(out_file, 'wb') 131 try: 132 os.path.chmod(out_file, mode) 133 except AttributeError: 134 pass 135 out_file = fp 136 opened_files.append(out_file) 137 # 138 # Main decoding loop 139 # 140 s = in_file.readline() 141 while s and s.strip() != 'end': 142 try: 143 data = binascii.a2b_uu(s) 144 except binascii.Error, v: 145 # Workaround for broken uuencoders by /Fredrik Lundh 146 nbytes = (((ord(s[0])-32) & 63) * 4 + 5) // 3 147 data = binascii.a2b_uu(s[:nbytes]) 148 if not quiet: 149 sys.stderr.write("Warning: %s\n" % v) 150 out_file.write(data) 151 s = in_file.readline() 152 if not s: 153 raise Error('Truncated input file') 154 finally: 155 for f in opened_files: 156 f.close() 157 158 def test(): 159 """uuencode/uudecode main program""" 160 161 import optparse 162 parser = optparse.OptionParser(usage='usage: %prog [-d] [-t] [input [output]]') 163 parser.add_option('-d', '--decode', dest='decode', help='Decode (instead of encode)?', default=False, action='store_true') 164 parser.add_option('-t', '--text', dest='text', help='data is text, encoded format unix-compatible text?', default=False, action='store_true') 165 166 (options, args) = parser.parse_args() 167 if len(args) > 2: 168 parser.error('incorrect number of arguments') 169 sys.exit(1) 170 171 input = sys.stdin 172 output = sys.stdout 173 if len(args) > 0: 174 input = args[0] 175 if len(args) > 1: 176 output = args[1] 177 178 if options.decode: 179 if options.text: 180 if isinstance(output, basestring): 181 output = open(output, 'w') 182 else: 183 print sys.argv[0], ': cannot do -t to stdout' 184 sys.exit(1) 185 decode(input, output) 186 else: 187 if options.text: 188 if isinstance(input, basestring): 189 input = open(input, 'r') 190 else: 191 print sys.argv[0], ': cannot do -t from stdin' 192 sys.exit(1) 193 encode(input, output) 194 195 if __name__ == '__main__': 196 test() 197
