BIOSUtilities/Fujitsu_SFX_Extract.py

#!/usr/bin/env python3 -B
# coding=utf-8

"""
Fujitsu SFX Extractor
Fujitsu SFX BIOS Extractor
Copyright (C) 2019-2024 Plato Mavropoulos
"""

import os

from common.comp_szip import is_szip_supported, szip_decompress
from common.path_ops import make_dirs
from common.patterns import PAT_FUJITSU_SFX
from common.system import printer
from common.templates import BIOSUtility
from common.text_ops import file_to_bytes

TITLE = 'Fujitsu SFX BIOS Extractor v4.0'


def is_fujitsu_sfx(in_file):
    """ Check if input is Fujitsu SFX image """

    buffer = file_to_bytes(in_file)

    return bool(PAT_FUJITSU_SFX.search(buffer))


def fujitsu_cabinet(in_file, extract_path, padding=0):
    """ Extract Fujitsu SFX image """

    buffer = file_to_bytes(in_file)

    match_cab = PAT_FUJITSU_SFX.search(buffer)  # Microsoft CAB Header XOR 0xFF

    if not match_cab:
        return 1

    printer('Detected obfuscated CAB archive!', padding)

    # Microsoft CAB Header XOR 0xFF starts after "FjSfxBinay" signature
    cab_start = match_cab.start() + 0xA

    # Determine the Microsoft CAB image size
    cab_size = int.from_bytes(buffer[cab_start + 0x8:cab_start + 0xC], 'little')  # Get LE XOR CAB size
    xor_size = int.from_bytes(b'\xFF' * 0x4, 'little')  # Create CAB size XOR value
    cab_size ^= xor_size  # Perform XOR 0xFF and get actual CAB size

    printer('Removing obfuscation...', padding + 4)

    # Determine the Microsoft CAB image Data
    cab_data = int.from_bytes(buffer[cab_start:cab_start + cab_size], 'big')  # Get BE XOR- CAB data
    xor_data = int.from_bytes(b'\xFF' * cab_size, 'big')  # Create CAB data XOR value
    cab_data = (cab_data ^ xor_data).to_bytes(cab_size, 'big')  # Perform XOR 0xFF and get actual CAB data

    printer('Extracting archive...', padding + 4)

    cab_path = os.path.join(extract_path, 'FjSfxBinay.cab')

    with open(cab_path, 'wb') as cab_file:
        cab_file.write(cab_data)  # Create temporary CAB archive

    if is_szip_supported(cab_path, padding + 8, check=True):
        if szip_decompress(cab_path, extract_path, 'FjSfxBinay CAB', padding + 8, check=True) == 0:
            os.remove(cab_path)  # Successful extraction, delete temporary CAB archive
        else:
            return 3
    else:
        return 2

    return 0


def fujitsu_sfx_extract(in_file, extract_path, padding=0):
    """ Parse & Extract Fujitsu SFX image """

    buffer = file_to_bytes(in_file)

    make_dirs(extract_path, delete=True)

    if fujitsu_cabinet(buffer, extract_path, padding) == 0:
        printer('Successfully Extracted!', padding)
    else:
        printer('Error: Failed to Extract image!', padding)

        return 1

    return 0


if __name__ == '__main__':
    BIOSUtility(title=TITLE, check=is_fujitsu_sfx, main=fujitsu_sfx_extract).run_utility()