extract.py

# Copyright (c) 2021, scufre
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# modification, are permitted provided that the following conditions are met:
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#    this list of conditions and the following disclaimer in the documentation
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import argparse
import os
import traceback
import dumpdisc
import dumpdisc.image

def extract(partition, destination):
	def _extract(directory, destination):
		for d in directory.directories:
			name = os.path.join(destination, d.name)
			print("Creating directory {}".format(name))
			os.mkdir(name)
			_extract(d, name)
		for f in directory.files:
			name = os.path.join(destination, f.name.strip())
			try:
				print("Extracting file {}".format(name))
				data = f.get_content(f.streams[0])
				with open(name, "wb") as fp:
					fp.write(data)
			except Exception as e:
				traceback.print_exc()
				print("ERROR: couldn't extract file {} ({})".format(name, str(e)))
			for stream in f.streams[1:]:
				extra_name = name + ".{}".format(stream)
				try:
					print("Extracting file {} for extra stream {}".format(name, stream))
					data = f.get_content(stream)
					with open(extra_name, "wb") as fp:
						fp.write(data)			
				except Exception as e:
					traceback.print_exc()
					print("ERROR: couldn't extract file {} ({})".format(extra_name, str(e)))
	_extract(partition.root_directory, destination)


parser = argparse.ArgumentParser(description="Extract the files of all filesystems found in a disc image")
group = parser.add_mutually_exclusive_group()
group.add_argument('-r' '--rawimage', help="Treat specified image file as a RAW image file (2352 bytes/sector)", dest="rawimage", action="store_true", default=False, required=False)
group.add_argument('-m' '--ddrmap', help="Use specified ddrescue map file (not valid for raw images)", dest="ddrmap", type=str, required=False)
parser.add_argument('-b' '--badmap', help="Use specified file with bad sectors", dest="badmap", type=str, required=False)
group = parser.add_mutually_exclusive_group()
group.add_argument('-s', '--start', help="Data track start sector (useful when the image is of a whole mixed CD)", type=int, dest="start", required=False, default=0)
group.add_argument('-o', '--offset', help="Image base sector offset (useful when the image is of the data portion of a mixed CD)", type=int, dest="offset", required=False, default=0)
parser.add_argument('image', help="Image file name", type=str)
parser.add_argument('output_dir', help="Output directory", type=str)
args = parser.parse_args()

f = open(args.image, "rb")
start = 0
cls = dumpdisc.image.RawCDImage if args.rawimage else dumpdisc.image.ISOImage
image = cls(f)
if args.offset != 0:
	image = dumpdisc.image.OffsetedImage(image, args.offset)
	start = args.offset
if args.badmap != None:
	image = dumpdisc.image.ImageWithBadMap(image, args.badmap)
if args.ddrmap != None:
	image = dumpdisc.image.DDRescueImage(image, args.ddrmap)
if args.start != 0:
	start = args.start
	
with image:
	disc = dumpdisc.Disc(image, start)
	for partition in disc.partitions:
		output_dir = os.path.join(args.output_dir, partition.type, partition.label)
		os.makedirs(output_dir)
		extract(partition, output_dir)