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# $Id$
#
# Copyright (C) 1997 Klee Dienes <klee@mit.edu>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
import sys, string, subfile
def parse_string (s):
e = len (s) - 1
while ((e != -1) and (s[e] == ' ')):
e = e - 1
return s[0:e+1]
def parse_num (s):
return string.atoi (s)
def parse_oct (s):
return string.atoi (s, 8)
def parse_header (s):
r = {}
r['name'] = parse_string (s[0:16])
r['date'] = parse_num (s[16:28])
r['uid'] = parse_oct (s[28:34])
r['gid'] = parse_oct (s[34:40])
r['mode'] = parse_oct (s[40:48])
r['size'] = parse_num (s[48:58])
r['fmag'] = s[58:60]
return r
def fseek (f, i):
try:
f.seek (i, 0)
return
except IOError, (errno, errstr):
if (errno != 29):
raise IOError, (errno, errstr)
while (f.tell () < i):
f.read (min (4096, i - f.tell()))
if (i < f.tell()):
raise ValueError, 'unable to seek backwards on stream'
def parse_file (f, p):
s = f.read (8)
if (s != '!<arch>\n'):
raise ValueError, 'archive file is missing magic number (read "%s")' % s
i = 8
while 1:
fseek (f, i)
s = f.read (60)
if (s == ''):
return
if (len (s) != 60):
raise ValueError, 'bad read'
r = parse_header (s)
r['offset'] = i + 60
i = i + 60 + (((r['size'] + 1) / 2) * 2)
r['file'] = subfile.subfile (f, r['offset'], r['size'])
p (f, r)
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