mirror of
https://github.com/platomav/BIOSUtilities.git
synced 2025-05-23 03:27:10 -04:00
d8e23f9ef3
New "package" flow, arguments now provided during utility call (README) New "main" flow, using old "run_utility" method of BIOSUtility (README) Removed "run_utility" and "show_version" methods from base BIOSUtility Removed argparse argument parsing logic from base BIOSUtility class Removed notion of "pause" (i.e. user action) from BIOSUtility logic Adjusted the README with usage info for "main" and "package" flows
88 lines
2.9 KiB
Python
88 lines
2.9 KiB
Python
#!/usr/bin/env python3 -B
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# coding=utf-8
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"""
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Fujitsu SFX Extractor
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Fujitsu SFX BIOS Extractor
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Copyright (C) 2019-2024 Plato Mavropoulos
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"""
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import os
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import re
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from biosutilities.common.compression import is_szip_supported, szip_decompress
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from biosutilities.common.paths import make_dirs
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from biosutilities.common.patterns import PAT_FUJITSU_SFX
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from biosutilities.common.system import printer
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from biosutilities.common.templates import BIOSUtility
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from biosutilities.common.texts import file_to_bytes
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class FujitsuSfxExtract(BIOSUtility):
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""" Fujitsu SFX BIOS Extractor """
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TITLE: str = 'Fujitsu SFX BIOS Extractor'
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def check_format(self) -> bool:
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""" Check if input is Fujitsu SFX image """
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input_buffer: bytes = file_to_bytes(in_object=self.input_object)
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return bool(PAT_FUJITSU_SFX.search(input_buffer))
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def parse_format(self) -> bool:
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""" Parse & Extract Fujitsu SFX image """
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input_buffer: bytes = file_to_bytes(in_object=self.input_object)
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# Microsoft CAB Header XOR 0xFF
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match_cab: re.Match[bytes] | None = PAT_FUJITSU_SFX.search(input_buffer)
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if not match_cab:
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return False
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printer(message='Detected obfuscated CAB archive!', padding=self.padding)
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# Microsoft CAB Header XOR 0xFF starts after "FjSfxBinay" signature
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cab_start: int = match_cab.start() + 0xA
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# Get LE XOR-ed CAB size
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cab_size: int = int.from_bytes(input_buffer[cab_start + 0x8:cab_start + 0xC], byteorder='little')
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# Create CAB size XOR value
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xor_size: int = int.from_bytes(b'\xFF' * 0x4, byteorder='little')
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# Perform XOR 0xFF and get actual CAB size
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cab_size ^= xor_size
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printer(message='Removing obfuscation...', padding=self.padding + 4)
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# Get BE XOR-ed CAB data
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cab_data: int = int.from_bytes(input_buffer[cab_start:cab_start + cab_size], byteorder='big')
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# Create CAB data XOR value
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xor_data: int = int.from_bytes(b'\xFF' * cab_size, byteorder='big')
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# Perform XOR 0xFF and get actual CAB data
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raw_data: bytes = (cab_data ^ xor_data).to_bytes(cab_size, 'big')
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printer(message='Extracting archive...', padding=self.padding + 4)
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make_dirs(in_path=self.extract_path, delete=True)
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cab_path: str = os.path.join(self.extract_path, 'FjSfxBinay.cab')
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# Create temporary CAB archive
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with open(cab_path, 'wb') as cab_file_object:
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cab_file_object.write(raw_data)
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if is_szip_supported(in_path=cab_path, padding=self.padding + 8, silent=False):
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if szip_decompress(in_path=cab_path, out_path=self.extract_path, in_name='FjSfxBinay CAB',
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padding=self.padding + 8, check=True):
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os.remove(cab_path)
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else:
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return False
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else:
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return False
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return True
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