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# 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

&quot;&quot;&quot;Implementation of the UUencode and UUdecode functions.

encode(in_file, out_file [,name, mode], *, backtick=False)
decode(in_file [, out_file, mode, quiet])
&quot;&quot;&quot;

import binascii
import os
import sys
import warnings

warnings._deprecated(__name__, remove=(3, 13))

__all__ = [&quot;Error&quot;, &quot;encode&quot;, &quot;decode&quot;]

class Error(Exception):
    pass

def encode(in_file, out_file, name=None, mode=None, *, backtick=False):
    &quot;&quot;&quot;Uuencode file&quot;&quot;&quot;
    #
    # If in_file is a pathname open it and change defaults
    #
    opened_files = []
    try:
        if in_file == &#039;-&#039;:
            in_file = sys.stdin.buffer
        elif isinstance(in_file, str):
            if name is None:
                name = os.path.basename(in_file)
            if mode is None:
                try:
                    mode = os.stat(in_file).st_mode
                except AttributeError:
                    pass
            in_file = open(in_file, &#039;rb&#039;)
            opened_files.append(in_file)
        #
        # Open out_file if it is a pathname
        #
        if out_file == &#039;-&#039;:
            out_file = sys.stdout.buffer
        elif isinstance(out_file, str):
            out_file = open(out_file, &#039;wb&#039;)
            opened_files.append(out_file)
        #
        # Set defaults for name and mode
        #
        if name is None:
            name = &#039;-&#039;
        if mode is None:
            mode = 0o666

        #
        # Remove newline chars from name
        #
        name = name.replace(&#039;\n&#039;,&#039;\\n&#039;)
        name = name.replace(&#039;\r&#039;,&#039;\\r&#039;)

        #
        # Write the data
        #
        out_file.write((&#039;begin %o %s\n&#039; % ((mode &amp; 0o777), name)).encode(&quot;ascii&quot;))
        data = in_file.read(45)
        while len(data) &gt; 0:
            out_file.write(binascii.b2a_uu(data, backtick=backtick))
            data = in_file.read(45)
        if backtick:
            out_file.write(b&#039;`\nend\n&#039;)
        else:
            out_file.write(b&#039; \nend\n&#039;)
    finally:
        for f in opened_files:
            f.close()


def decode(in_file, out_file=None, mode=None, quiet=False):
    &quot;&quot;&quot;Decode uuencoded file&quot;&quot;&quot;
    #
    # Open the input file, if needed.
    #
    opened_files = []
    if in_file == &#039;-&#039;:
        in_file = sys.stdin.buffer
    elif isinstance(in_file, str):
        in_file = open(in_file, &#039;rb&#039;)
        opened_files.append(in_file)

    try:
        #
        # Read until a begin is encountered or we&#039;ve exhausted the file
        #
        while True:
            hdr = in_file.readline()
            if not hdr:
                raise Error(&#039;No valid begin line found in input file&#039;)
            if not hdr.startswith(b&#039;begin&#039;):
                continue
            hdrfields = hdr.split(b&#039; &#039;, 2)
            if len(hdrfields) == 3 and hdrfields[0] == b&#039;begin&#039;:
                try:
                    int(hdrfields[1], 8)
                    break
                except ValueError:
                    pass
        if out_file is None:
            # If the filename isn&#039;t ASCII, what&#039;s up with that?!?
            out_file = hdrfields[2].rstrip(b&#039; \t\r\n\f&#039;).decode(&quot;ascii&quot;)
            if os.path.exists(out_file):
                raise Error(f&#039;Cannot overwrite existing file: {out_file}&#039;)
            if (out_file.startswith(os.sep) or
                f&#039;..{os.sep}&#039; in out_file or (
                    os.altsep and
                    (out_file.startswith(os.altsep) or
                     f&#039;..{os.altsep}&#039; in out_file))
               ):
                raise Error(f&#039;Refusing to write to {out_file} due to directory traversal&#039;)
        if mode is None:
            mode = int(hdrfields[1], 8)
        #
        # Open the output file
        #
        if out_file == &#039;-&#039;:
            out_file = sys.stdout.buffer
        elif isinstance(out_file, str):
            fp = open(out_file, &#039;wb&#039;)
            os.chmod(out_file, mode)
            out_file = fp
            opened_files.append(out_file)
        #
        # Main decoding loop
        #
        s = in_file.readline()
        while s and s.strip(b&#039; \t\r\n\f&#039;) != b&#039;end&#039;:
            try:
                data = binascii.a2b_uu(s)
            except binascii.Error as v:
                # Workaround for broken uuencoders by /Fredrik Lundh
                nbytes = (((s[0]-32) &amp; 63) * 4 + 5) // 3
                data = binascii.a2b_uu(s[:nbytes])
                if not quiet:
                    sys.stderr.write(&quot;Warning: %s\n&quot; % v)
            out_file.write(data)
            s = in_file.readline()
        if not s:
            raise Error(&#039;Truncated input file&#039;)
    finally:
        for f in opened_files:
            f.close()

def test():
    &quot;&quot;&quot;uuencode/uudecode main program&quot;&quot;&quot;

    import optparse
    parser = optparse.OptionParser(usage=&#039;usage: %prog [-d] [-t] [input [output]]&#039;)
    parser.add_option(&#039;-d&#039;, &#039;--decode&#039;, dest=&#039;decode&#039;, help=&#039;Decode (instead of encode)?&#039;, default=False, action=&#039;store_true&#039;)
    parser.add_option(&#039;-t&#039;, &#039;--text&#039;, dest=&#039;text&#039;, help=&#039;data is text, encoded format unix-compatible text?&#039;, default=False, action=&#039;store_true&#039;)

    (options, args) = parser.parse_args()
    if len(args) &gt; 2:
        parser.error(&#039;incorrect number of arguments&#039;)
        sys.exit(1)

    # Use the binary streams underlying stdin/stdout
    input = sys.stdin.buffer
    output = sys.stdout.buffer
    if len(args) &gt; 0:
        input = args[0]
    if len(args) &gt; 1:
        output = args[1]

    if options.decode:
        if options.text:
            if isinstance(output, str):
                output = open(output, &#039;wb&#039;)
            else:
                print(sys.argv[0], &#039;: cannot do -t to stdout&#039;)
                sys.exit(1)
        decode(input, output)
    else:
        if options.text:
            if isinstance(input, str):
                input = open(input, &#039;rb&#039;)
            else:
                print(sys.argv[0], &#039;: cannot do -t from stdin&#039;)
                sys.exit(1)
        encode(input, output)

if __name__ == &#039;__main__&#039;:
    test()
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