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192 lines
5.7 KiB
Python
Executable File
192 lines
5.7 KiB
Python
Executable File
#! /usr/bin/env python
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# Copyright 1994 by Lance Ellinghouse
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# Cathedral City, California Republic, United States of America.
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# All Rights Reserved
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose and without fee is hereby granted,
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# provided that the above copyright notice appear in all copies and that
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# both that copyright notice and this permission notice appear in
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# supporting documentation, and that the name of Lance Ellinghouse
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# not be used in advertising or publicity pertaining to distribution
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# of the software without specific, written prior permission.
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# LANCE ELLINGHOUSE DISCLAIMS ALL WARRANTIES WITH REGARD TO
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# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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# FITNESS, IN NO EVENT SHALL LANCE ELLINGHOUSE CENTRUM BE LIABLE
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# FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#
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# Modified by Jack Jansen, CWI, July 1995:
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# - Use binascii module to do the actual line-by-line conversion
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# between ascii and binary. This results in a 1000-fold speedup. The C
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# version is still 5 times faster, though.
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# - Arguments more compliant with python standard
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"""Implementation of the UUencode and UUdecode functions.
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encode(in_file, out_file [,name, mode])
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decode(in_file [, out_file, mode])
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"""
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import binascii
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import os
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import sys
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from types import StringType
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__all__ = ["Error", "encode", "decode"]
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class Error(Exception):
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pass
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def encode(in_file, out_file, name=None, mode=None):
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"""Uuencode file"""
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#
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# If in_file is a pathname open it and change defaults
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#
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if in_file == '-':
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in_file = sys.stdin
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elif isinstance(in_file, StringType):
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if name is None:
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name = os.path.basename(in_file)
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if mode is None:
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try:
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mode = os.stat(in_file).st_mode
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except AttributeError:
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pass
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in_file = open(in_file, 'rb')
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#
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# Open out_file if it is a pathname
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#
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if out_file == '-':
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out_file = sys.stdout
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elif isinstance(out_file, StringType):
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out_file = open(out_file, 'w')
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#
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# Set defaults for name and mode
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#
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if name is None:
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name = '-'
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if mode is None:
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mode = 0666
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#
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# Write the data
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#
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out_file.write('begin %o %s\n' % ((mode&0777),name))
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str = in_file.read(45)
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while len(str) > 0:
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out_file.write(binascii.b2a_uu(str))
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str = in_file.read(45)
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out_file.write(' \nend\n')
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def decode(in_file, out_file=None, mode=None, quiet=0):
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"""Decode uuencoded file"""
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#
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# Open the input file, if needed.
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#
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if in_file == '-':
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in_file = sys.stdin
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elif isinstance(in_file, StringType):
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in_file = open(in_file)
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#
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# Read until a begin is encountered or we've exhausted the file
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#
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while 1:
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hdr = in_file.readline()
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if not hdr:
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raise Error, 'No valid begin line found in input file'
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if hdr[:5] != 'begin':
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continue
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hdrfields = hdr.split(" ", 2)
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if len(hdrfields) == 3 and hdrfields[0] == 'begin':
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try:
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int(hdrfields[1], 8)
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break
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except ValueError:
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pass
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if out_file is None:
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out_file = hdrfields[2].rstrip()
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if os.path.exists(out_file):
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raise Error, 'Cannot overwrite existing file: %s' % out_file
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if mode is None:
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mode = int(hdrfields[1], 8)
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#
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# Open the output file
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#
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if out_file == '-':
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out_file = sys.stdout
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elif isinstance(out_file, StringType):
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fp = open(out_file, 'wb')
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try:
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os.path.chmod(out_file, mode)
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except AttributeError:
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pass
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out_file = fp
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#
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# Main decoding loop
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#
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s = in_file.readline()
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while s and s.strip() != 'end':
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try:
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data = binascii.a2b_uu(s)
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except binascii.Error, v:
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# Workaround for broken uuencoders by /Fredrik Lundh
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nbytes = (((ord(s[0])-32) & 63) * 4 + 5) / 3
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data = binascii.a2b_uu(s[:nbytes])
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if not quiet:
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sys.stderr.write("Warning: %s\n" % str(v))
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out_file.write(data)
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s = in_file.readline()
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if not s:
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raise Error, 'Truncated input file'
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def test():
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"""uuencode/uudecode main program"""
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import getopt
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dopt = 0
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topt = 0
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input = sys.stdin
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output = sys.stdout
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ok = 1
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try:
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optlist, args = getopt.getopt(sys.argv[1:], 'dt')
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except getopt.error:
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ok = 0
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if not ok or len(args) > 2:
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print 'Usage:', sys.argv[0], '[-d] [-t] [input [output]]'
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print ' -d: Decode (in stead of encode)'
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print ' -t: data is text, encoded format unix-compatible text'
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sys.exit(1)
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for o, a in optlist:
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if o == '-d': dopt = 1
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if o == '-t': topt = 1
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if len(args) > 0:
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input = args[0]
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if len(args) > 1:
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output = args[1]
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if dopt:
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if topt:
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if isinstance(output, StringType):
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output = open(output, 'w')
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else:
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print sys.argv[0], ': cannot do -t to stdout'
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sys.exit(1)
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decode(input, output)
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else:
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if topt:
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if isinstance(input, StringType):
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input = open(input, 'r')
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else:
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print sys.argv[0], ': cannot do -t from stdin'
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sys.exit(1)
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encode(input, output)
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if __name__ == '__main__':
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test()
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