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#! /usr/bin/env python2.2
# 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
"""Implementation of the UUencode and UUdecode functions.
encode(in_file, out_file [,name, mode])
decode(in_file [, out_file, mode])
"""
import binascii
import os
import sys
from types import StringType
__all__ = ["Error", "decode"]
class Error(Exception):
pass
def decode(in_file, out_file=None, mode=None, quiet=0):
"""Decode uuencoded file"""
#
# Open the input file, if needed.
#
if in_file == '-':
in_file = sys.stdin
elif isinstance(in_file, StringType):
in_file = open(in_file)
#
# Read until a begin is encountered or we've exhausted the file
#
while 1:
hdr = in_file.readline()
if not hdr:
raise Error, 'No valid begin line found in input file'
if hdr[:5] != 'begin':
continue
hdrfields = hdr.split(" ", 2)
if len(hdrfields) == 3 and hdrfields[0] == 'begin':
try:
int(hdrfields[1], 8)
start_pos = in_file.tell() - len (hdr)
break
except ValueError:
pass
if out_file is None:
out_file = hdrfields[2].rstrip()
if os.path.exists(out_file):
raise Error, 'Cannot overwrite existing file: %s' % out_file
if mode is None:
mode = int(hdrfields[1], 8)
#
# Open the output file
#
if out_file == '-':
out_file = sys.stdout
elif isinstance(out_file, StringType):
fp = open(out_file, 'wb')
try:
os.path.chmod(out_file, mode)
except AttributeError:
pass
out_file = fp
#
# Main decoding loop
#
s = in_file.readline()
while s and s.strip() != 'end':
try:
data = binascii.a2b_uu(s)
except binascii.Error, v:
# Workaround for broken uuencoders by /Fredrik Lundh
nbytes = (((ord(s[0])-32) & 63) * 4 + 5) / 3
data = binascii.a2b_uu(s[:nbytes])
if not quiet:
sys.stderr.write("Warning: %s\n" % str(v))
out_file.write(data)
s = in_file.readline()
# if not s:
# raise Error, 'Truncated input file'
return (hdrfields[2].rstrip(), start_pos, in_file.tell())
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