215 lines
6.1 KiB
Python
Executable File
215 lines
6.1 KiB
Python
Executable File
# uu.py
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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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# This file implements the UUencode and UUdecode functions.
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# encode(filename, mode, in_file, out_file)
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# decode(filename, mode, in_file)
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# decode(in_file, out_file)
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# decode(in_file)
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# encode a single char to always be printable
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def _ENC(ch):
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if type(ch) == type(''):
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a = ch[:1] # only 1 char
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if len(a) == 0:
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raise ValueError, 'need to pass in at least 1 char'
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a = ord(a)
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elif type(ch) == type(0):
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a = ch
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else:
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raise TypeError, 'must pass in an integer or single character'
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return chr((a & 077) + ord(' '))
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# input 3 chars, output 4 encoded chars
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def _outenc(str):
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if len(str) > 3:
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raise ValueError, 'can only accept strings of 3 chars'
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p0, p1, p2 = 0, 0, 0
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if len(str) > 2:
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p2 = ord(str[2])
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if len(str) > 1:
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p1 = ord(str[1])
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if len(str) > 0:
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p0 = ord(str[0])
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c1 = p0 >> 2
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c2 = (p0 << 4) & 060 | (p1 >> 4) & 017
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c3 = (p1 << 2) & 074 | (p2 >> 6) & 03
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c4 = p2 & 077
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rtn = _ENC(c1)
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rtn = rtn + _ENC(c2)
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rtn = rtn + _ENC(c3)
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rtn = rtn + _ENC(c4)
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return rtn
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# pass in 45 bytes max, returns 62 bytes encoded
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def _encode(str):
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if len(str) > 45:
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raise ValueError, 'cannot handle more than 45 chars at once'
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length = len(str)
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rtn = _ENC(length)
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i = 0
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while i < length:
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rtn = rtn + _outenc(str[i:(i+3)])
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i = i + 3
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rtn = rtn + '\n'
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return rtn
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# encode a fileobject and write out to a file object
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def encode(filename, mode, in_file, out_file):
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out_file.write('begin %o %s\n' % ((mode&0777),filename))
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str = in_file.read(45)
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while len(str) > 0:
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out_file.write(_encode(str))
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str = in_file.read(45)
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out_file.write(' \nend\n')
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return None
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# def decode a single char from printable to possibly non-printable
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def _DEC(ch):
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if type(ch) != type('') or len(ch) != 1:
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raise ValueError, 'need to pass in a single char'
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a = ord(ch[0:1])
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return (a - ord(' '))
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# input 4 chars encoded, output 3 chars unencoded
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def _outdec(str):
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if len(str) > 4:
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raise ValueError, 'can only accept strings of 4 chars'
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p0, p1, p2, p3 = 0, 0, 0, 0
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if len(str) > 3:
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p3 = _DEC(str[3])
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if len(str) > 2:
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p2 = _DEC(str[2])
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if len(str) > 1:
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p1 = _DEC(str[1])
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if len(str) > 0:
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p0 = _DEC(str[0])
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c1 = p0 << 2 | (p1 & 060) >> 4
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c2 = (p1 & 017) << 4 | (p2 & 074) >> 2
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c3 = (p2 & 03) << 6 | (p3 & 077)
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rtn = chr(c1)
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rtn = rtn + chr(c2)
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rtn = rtn + chr(c3)
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return rtn
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# pass in 62 bytes and return 45 bytes unencoded
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def _decode(str):
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if len(str) > 62:
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raise ValueError, 'cannot handle more than 62 chars at once'
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length = _DEC(str[0])
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i = 1
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rtn = ''
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while len(rtn) < length:
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rtn = rtn + _outdec(str[i:(i+4)])
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i = i + 4
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return rtn[0:length]
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# decode(filename, mode, in_file)
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# decode(in_file, out_file)
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# decode(in_file)
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def decode(*args):
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ok = 1
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_setup = None
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out_file = None
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if len(args) == 3:
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filename, mode, in_file = args
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if type(filename) != type(''):
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ok = 0
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if type(mode) != type(0):
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ok = 0
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try:
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_ = getattr(in_file,'readline')
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except AttributeError:
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ok = 0
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def _setup(out_file,args):
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filename, mode, in_file = args
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# open file as specified and assign out_file for later use
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out_file = open(filename,'w',mode)
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_out_file_orig = 0
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_ = in_file.readline()
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return (out_file,_out_file_orig)
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elif len(args) == 2:
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in_file, out_file = args
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try:
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_ = getattr(in_file,'readline')
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_ = getattr(out_file,'write')
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except AttributeError:
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ok = 0
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def _setup(out_file, args):
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in_file, out_file = args
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# Toss the 'begin mode filename' part.. not needed
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_ = in_file.readline()
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_out_file_orig = 1
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return (out_file,_out_file_orig)
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elif len(args) == 1:
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in_file = args[0]
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try:
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_ = getattr(in_file,'readline')
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except AttributeError:
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ok = 0
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def _setup(out_file, args):
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import strop
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in_file = args[0]
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# open file as specified in uu file and
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# assign out_file for later use
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i = in_file.readline()
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i = strop.strip(i)
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if 'begin' != i[:5]:
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raise IOError, 'input file not in UUencoded format'
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[dummy, mode, filename] = strop.split(i)
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mode = strop.atoi(mode, 8)
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out_file = open(filename,'w',mode)
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_out_file_orig = 0
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return (out_file,_out_file_orig)
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if ok != 1:
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raise SyntaxError, 'must be (filename, mode, in_file) or (in_file,out_file) or (in_file)'
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out_file, _out_file_orig = _setup(out_file, args)
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str = in_file.readline()
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while len(str) > 0 and str != ' \n' and str != 'end\n':
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out_file.write(_decode(str))
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str = in_file.readline()
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if _out_file_orig == 0:
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out_file.close()
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del out_file
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return None
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def test():
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import sys
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if sys.argv[1:2] == ['-d']:
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if sys.argv[2:]:
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decode(open(sys.argv[2]), sys.stdout)
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else:
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decode(sys.stdin, sys.stdout)
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elif sys.argv[1:2] == ['-e']:
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if sys.argv[2:]:
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file = sys.argv[2]
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fp = open(file)
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else:
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file = '-'
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fp = sys.stdin
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encode(file, 0644, fp, sys.stdout)
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else:
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print 'usage: uu -d [file]; (to decode)'
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print 'or: uu -e [file]; (to encode)'
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sys.exit(2)
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if __name__ == '__main__':
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test()
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