מסע אל העבר

קוד: בחירת הכל

1 = [$THISDIR]..\data.big (bigfile);

קוד: בחירת הכל

1 = [$THISDIR]..\german_data.big (bigfile);

קוד: בחירת הכל

import os
import struct

MAX_PATH_LEN = 260
ENTRY_SIZE = struct.calcsize('260sII')
OUTPUT_DIRECTORY = 'extracted'
data = None

def initialize():
	with open('data.big', 'rb') as fd:
		global data
		data = fd.read()

def offset_at(offset):
	return struct.unpack_from('I', data, offset)[0]

def read_file_entry(offset):
	file_name, file_offset, file_size = struct.unpack_from('260sII', data, offset)
	try:
		file_name = file_name.split(b'\0', 1)[0].decode('utf-8')
	except Exception as e:
		file_name = file_name.replace(b'\xe6', b'\xc3\xa6')
		file_name = file_name.split(b'\0', 1)[0].decode('utf-8')
	return file_name, file_offset, file_size

def create_directory(file_name):
	try:
		os.makedirs(file_name)
	except FileExistsError:
		pass


def extract_entry(offset):
	file_name, file_offset, file_size = read_file_entry(offset)
	print ('file name is:', str(file_name))
	print ('file offset is:', hex(file_offset))
	print ('file size is:', file_size)
	print ()

	if os.path.dirname(file_name) != '':
		create_directory(os.path.dirname(file_name))
	with open(file_name, 'wb') as fd:
		fd.write(data[file_offset:file_offset + file_size])
		

def main():
	initialize()
	file_table_offset = offset_at(7)
	offset = file_table_offset

	create_directory(OUTPUT_DIRECTORY)
	os.chdir(OUTPUT_DIRECTORY)
	while offset < len(data):
		extract_entry(offset)
		offset += ENTRY_SIZE


if __name__ == '__main__':
	main()

קוד: בחירת הכל

import os
import struct

MAX_PATH_LEN = 260
ENTRY_SIZE = struct.calcsize('260sII')
INPUT_DIRECTORY = 'extracted'
files = dict()


def create_file_entry(file_name, file_offset, file_size):
	return struct.pack('260sII', file_name.encode().replace(b'\xc3\xa6', b'\xe6'), file_offset, file_size)

def scan_dir(directory_path='.\\'):
	global files

	current_dir = os.listdir(directory_path)
	for file_name in current_dir:
		file_name = directory_path + os.sep + file_name
		if os.path.isdir(file_name):
			scan_dir(file_name)
		else:
			with open(file_name, 'rb') as fd:
				file_data = fd.read()
			files[os.path.normpath(file_name)] = file_data
	return

def write_output(output_filename):
	file_to_offset = dict()
	current_offset = 11
	data = b''

	for file_name in sorted(files):
		file_to_offset[file_name] = current_offset
		data += files[file_name]
		current_offset += len(files[file_name])
	data = b'BIGFILE' + struct.pack('I', current_offset) + data
	
	for file_name in sorted(files):
		data += create_file_entry(file_name, file_to_offset[file_name], len(files[file_name]))
	with open(output_filename, 'wb') as fd:
		fd.write(data)


def main():
	original_cwd = os.getcwd()

	os.chdir(INPUT_DIRECTORY)

	scan_dir()

	os.chdir(original_cwd)


	write_output('data.big')
	return


if __name__ == '__main__':
	main()