+++ /dev/null
-#!/usr/bin/env python
-# vim: set ts=4 sts=4 sw=4 textwidth=92:
-
-"""
-Module which holds PAR2 file parsing functions.
-
-Much of this code was borrowed from the excellent cfv project.
-See http://cfv.sourceforge.net/ for a copy.
-"""
-
-__author__ = "Ira W. Snyder (devel@irasnyder.com)"
-__copyright__ = "Copyright (c) 2006,2007 Ira W. Snyder (devel@irasnyder.com)"
-__license__ = "GNU GPL v2 (or, at your option, any later version)"
-
-# par2parser.py -- PAR2 file parsing utility
-#
-# Copyright (C) 2006,2007 Ira W. Snyder (devel@irasnyder.com)
-#
-# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-
-
-import struct, errno, os, md5
-
-def chompnulls(line):
- p = line.find('\0')
- if p < 0: return line
- else: return line[:p]
-
-def get_protected_files (dir, filename):
- """Get all of the filenames that are protected by the par2
- file given as the filename"""
-
- assert os.path.isdir (dir) # MUST be a valid directory
- assert os.path.isfile (os.path.join (dir, filename))
-
- full_filename = os.path.join (dir, filename)
-
- try:
- file = open(full_filename, 'rb')
- except:
- print 'Could not open %s' % (full_filename, )
- return []
-
- # We always want to do crc checks
- docrcchecks = True
-
- pkt_header_fmt = '< 8s Q 16s 16s 16s'
- pkt_header_size = struct.calcsize(pkt_header_fmt)
- file_pkt_fmt = '< 16s 16s 16s Q'
- file_pkt_size = struct.calcsize(file_pkt_fmt)
- main_pkt_fmt = '< Q I'
- main_pkt_size = struct.calcsize(main_pkt_fmt)
-
- seen_file_ids = {}
- expected_file_ids = None
- filenames = []
-
- # This try is here to ensure that we close the open file before
- # returning. Since this code was (pretty much) borrowed verbatim
- # from the cfv project, I didn't want to refactor it to make file
- # closing more sane, so I just used a try / finally clause.
- try:
- while 1:
- d = file.read(pkt_header_size)
- if not d:
- break
-
- magic, pkt_len, pkt_md5, set_id, pkt_type = struct.unpack(pkt_header_fmt, d)
-
- if docrcchecks:
- control_md5 = md5.new()
- control_md5.update(d[0x20:])
- d = file.read(pkt_len - pkt_header_size)
- control_md5.update(d)
-
- if control_md5.digest() != pkt_md5:
- raise EnvironmentError, (errno.EINVAL, \
- "corrupt par2 file - bad packet hash")
-
- if pkt_type == 'PAR 2.0\0FileDesc':
- if not docrcchecks:
- d = file.read(pkt_len - pkt_header_size)
-
- file_id, file_md5, file_md5_16k, file_size = \
- struct.unpack(file_pkt_fmt, d[:file_pkt_size])
-
- if seen_file_ids.get(file_id) is None:
- seen_file_ids[file_id] = 1
- filename = chompnulls(d[file_pkt_size:])
- filenames.append(filename)
-
- elif pkt_type == "PAR 2.0\0Main\0\0\0\0":
- if not docrcchecks:
- d = file.read(pkt_len - pkt_header_size)
-
- if expected_file_ids is None:
- expected_file_ids = []
- slice_size, num_files = struct.unpack(main_pkt_fmt, d[:main_pkt_size])
- num_nonrecovery = (len(d)-main_pkt_size)/16 - num_files
-
- for i in range(main_pkt_size,main_pkt_size+(num_files+num_nonrecovery)*16,16):
- expected_file_ids.append(d[i:i+16])
-
- else:
- if not docrcchecks:
- file.seek(pkt_len - pkt_header_size, 1)
-
- if expected_file_ids is None:
- raise EnvironmentError, (errno.EINVAL, \
- "corrupt or unsupported par2 file - no main packet found")
-
- for id in expected_file_ids:
- if not seen_file_ids.has_key(id):
- raise EnvironmentError, (errno.EINVAL, \
- "corrupt or unsupported par2 file - " \
- "expected file description packet not found")
- finally:
- file.close ()
-
- return filenames
-
-def main ():
- pass
-
-if __name__ == '__main__':
- main ()
-
projects / rarslave2.git / blobdiff