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# Cathedral City, California Republic, United States of America.

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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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# 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], *, backtick=False)

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decode(in_file [, out_file, mode, quiet])

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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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__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, *, backtick=False):

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"""Uuencode file"""

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# If in_file is a pathname open it and change defaults

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opened_files = []

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try:

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if in_file == '-':

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in_file = sys.stdin.buffer

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elif isinstance(in_file, str):

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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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opened_files.append(in_file)

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# Open out_file if it is a pathname

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if out_file == '-':

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out_file = sys.stdout.buffer

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elif isinstance(out_file, str):

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out_file = open(out_file, 'wb')

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opened_files.append(out_file)

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# Set defaults for name and mode

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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 = 0o666

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# Remove newline chars from name

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name = name.replace('\n','\\n')

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name = name.replace('\r','\\r')

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# Write the data

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out_file.write(('begin %o %s\n' % ((mode & 0o777), name)).encode("ascii"))

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data = in_file.read(45)

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while len(data) > 0:

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out_file.write(binascii.b2a_uu(data, backtick=backtick))

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data = in_file.read(45)

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if backtick:

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out_file.write(b'`\nend\n')

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else:

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out_file.write(b' \nend\n')

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finally:

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for f in opened_files:

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f.close()

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def decode(in_file, out_file=None, mode=None, quiet=False):

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"""Decode uuencoded file"""

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# Open the input file, if needed.

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opened_files = []

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if in_file == '-':

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in_file = sys.stdin.buffer

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elif isinstance(in_file, str):

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in_file = open(in_file, 'rb')

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opened_files.append(in_file)

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try:

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# Read until a begin is encountered or we've exhausted the file

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while True:

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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 not hdr.startswith(b'begin'):

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continue

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hdrfields = hdr.split(b' ', 2)

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if len(hdrfields) == 3 and hdrfields[0] == b'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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# If the filename isn't ASCII, what's up with that?!?

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out_file = hdrfields[2].rstrip(b' \t\r\n\f').decode("ascii")

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if os.path.exists(out_file):

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raise Error(f'Cannot overwrite existing file: {out_file}')

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if (out_file.startswith(os.sep) or

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f'..{os.sep}' in out_file or (

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os.altsep and

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(out_file.startswith(os.altsep) or

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f'..{os.altsep}' in out_file))

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raise Error(f'Refusing to write to {out_file} due to directory traversal')

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if mode is None:

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mode = int(hdrfields[1], 8)

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# Open the output file

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if out_file == '-':

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out_file = sys.stdout.buffer

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elif isinstance(out_file, str):

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fp = open(out_file, 'wb')

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os.chmod(out_file, mode)

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out_file = fp

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opened_files.append(out_file)

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# Main decoding loop

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s = in_file.readline()

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while s and s.strip(b' \t\r\n\f') != b'end':

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try:

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data = binascii.a2b_uu(s)

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except binascii.Error as v:

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# Workaround for broken uuencoders by /Fredrik Lundh

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nbytes = (((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" % 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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finally:

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for f in opened_files:

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f.close()

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def test():

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"""uuencode/uudecode main program"""

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import optparse

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parser = optparse.OptionParser(usage='usage: %prog [-d] [-t] [input [output]]')

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parser.add_option('-d', '--decode', dest='decode', help='Decode (instead of encode)?', default=False, action='store_true')

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parser.add_option('-t', '--text', dest='text', help='data is text, encoded format unix-compatible text?', default=False, action='store_true')

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(options, args) = parser.parse_args()

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if len(args) > 2:

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parser.error('incorrect number of arguments')

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sys.exit(1)

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# Use the binary streams underlying stdin/stdout

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input = sys.stdin.buffer

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output = sys.stdout.buffer

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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 options.decode:

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if options.text:

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if isinstance(output, str):

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output = open(output, 'wb')

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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 options.text:

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if isinstance(input, str):

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input = open(input, 'rb')

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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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