mirror of
https://github.com/iKarith/cppo-ng.git
synced 2024-06-01 06:41:27 +00:00
116 lines
3.8 KiB
Python
116 lines
3.8 KiB
Python
# vim: set tabstop=4 shiftwidth=4 noexpandtab filetype=python:
|
|
|
|
# Copyright (C) 2017 T. Joseph Carter
|
|
#
|
|
# 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 os
|
|
import struct
|
|
from collections import namedtuple
|
|
|
|
# FIXME Move to_sys_name
|
|
from . import legacy
|
|
|
|
### NEW DISK CLASSES
|
|
|
|
TWOIMG_V1_UNPACK = (
|
|
'<' # use little-endian numbers
|
|
'4s' # magic string '2IMG'
|
|
'4s' # creator string
|
|
'H' # header length
|
|
'H' # 2mg version
|
|
'L' # image format
|
|
'L' # flags (we unpack it into "vol")
|
|
'L' # number of 512 blocks
|
|
'L' # image data offset
|
|
'L' # image data length
|
|
'L' # comment offset
|
|
'L' # comment length
|
|
'L' # creator private use offset
|
|
'L' # creator private use length
|
|
'16x' # reserved for future use
|
|
)
|
|
TWOIMG_V1_ATTRS = (
|
|
'magic', 'creator', 'hdr_len', 'version',
|
|
'img_fmt', 'flags', 'num_blocks',
|
|
'data_offset', 'data_len',
|
|
'comment_offset', 'comment_len',
|
|
'creator_offset', 'creator_len'
|
|
)
|
|
|
|
TwoImgV1 = namedtuple('TwoImgV1', TWOIMG_V1_ATTRS)
|
|
|
|
class Disk:
|
|
def __init__(self, name=None):
|
|
if name is not None:
|
|
self.pathname = name
|
|
self.path, self.filename = os.path.split(name)
|
|
self.diskname, self.ext = os.path.splitext(self.filename)
|
|
self.ext = os.path.splitext(name)[1].lower()
|
|
# FIXME: Handle compressed images?
|
|
with open(legacy.to_sys_name(name), "rb") as f:
|
|
self.image = f.read()
|
|
|
|
if self.ext in ('.2mg', '.2img'):
|
|
self._parse_2mg()
|
|
|
|
def _parse_2mg(self):
|
|
self.twoimg = None
|
|
self.twoimg_comment = None
|
|
self.twoimg_creator = None
|
|
self.twoimg_locked = None
|
|
hdr = TwoImgV1(*struct.unpack_from(TWOIMG_V1_UNPACK, self.image))
|
|
if hdr.magic == b'2IMG':
|
|
self._raw_twoimg = self.image[:hdr.hdr_len]
|
|
if hdr.version == 1:
|
|
if hdr.hdr_len == 64:
|
|
# Extract comment (if it exists and is valid)
|
|
if hdr.comment_offset and hdr.comment_len:
|
|
self.twoimg_comment = self.image[
|
|
hdr.comment_offset
|
|
: hdr.comment_offset + hdr.comment_len]
|
|
if len(self.twoimg_comment) != hdr.comment_len:
|
|
log.warn('invalid 2mg comment: {} bytes '
|
|
'(expected {} bytes)'.format(
|
|
len(self.twoimg_comment),
|
|
hdr.comment_len))
|
|
self.twoimg_comment = None
|
|
|
|
# Extract creator area (if it exists and is valid)
|
|
if hdr.creator_offset and hdr.creator_len:
|
|
self.twoimg_creator = self.image[
|
|
hdr.creator_offset
|
|
: hdr.creator_offset + hdr.creator_len]
|
|
if len(self.twoimg_creator) != hdr.creator_len:
|
|
log.warn('invalid 2mg creator: {} bytes '
|
|
'(expected {} bytes)'.format(
|
|
len(self.twoimg_creator),
|
|
hdr.creator_len))
|
|
self.twoimg_creator = None
|
|
|
|
self.twoimg_locked = bool(hdr.flags & 0x80000000)
|
|
|
|
self.twoimg = hdr
|
|
else:
|
|
log.warn('2mg header length: {} (expected 64 '
|
|
'for version 1)'.format(hdr.hdr_len))
|
|
else:
|
|
log.warn('2mg version unsupported: {} (only support '
|
|
'version 1)'.format(hdr.version))
|
|
else:
|
|
log.warn('2mg header not found: magic is {}'.format(hdr.magic))
|
|
self._raw_twoimg = None
|
|
|