mirror of
https://github.com/platomav/BIOSUtilities.git
synced 2025-05-20 02:05:30 -04:00
f895fc208c
Added graceful exception hanlding during "main" flow Improved and cleaned 7-Zip and EFI compression logic Improved too aggressive extraction directory handling Fixed input name detection at VAIO Package Extractor Fixed Intel IBIOSI detection at Apple EFI Identifier
124 lines
4.4 KiB
Python
124 lines
4.4 KiB
Python
#!/usr/bin/env python3 -B
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# coding=utf-8
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"""
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Apple PBZX Extract
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Apple EFI PBZX Extractor
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Copyright (C) 2021-2024 Plato Mavropoulos
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"""
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import ctypes
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import logging
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import lzma
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import os
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from typing import Any, Final
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from biosutilities.common.compression import is_szip_supported, szip_decompress
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from biosutilities.common.paths import delete_file, make_dirs, path_stem
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from biosutilities.common.patterns import PAT_APPLE_PBZX
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from biosutilities.common.structs import ctypes_struct, UINT32
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from biosutilities.common.system import printer
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from biosutilities.common.templates import BIOSUtility
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class PbzxChunk(ctypes.BigEndianStructure):
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""" PBZX Chunk Header """
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_pack_ = 1
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_fields_ = [
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('Reserved0', UINT32), # 0x00
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('InitSize', UINT32), # 0x04
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('Reserved1', UINT32), # 0x08
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('CompSize', UINT32) # 0x0C
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# 0x10
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]
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def struct_print(self, padding: int = 0) -> None:
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""" Display structure information """
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printer(message=['Reserved 0 :', f'0x{self.Reserved0:X}'], padding=padding, new_line=False)
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printer(message=['Initial Size :', f'0x{self.InitSize:X}'], padding=padding, new_line=False)
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printer(message=['Reserved 1 :', f'0x{self.Reserved1:X}'], padding=padding, new_line=False)
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printer(message=['Compressed Size:', f'0x{self.CompSize:X}'], padding=padding, new_line=False)
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class AppleEfiPbzxExtract(BIOSUtility):
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""" Apple EFI PBZX Extractor """
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TITLE: str = 'Apple EFI PBZX Extractor'
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PBZX_CHUNK_HDR_LEN: Final[int] = ctypes.sizeof(PbzxChunk)
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def check_format(self) -> bool:
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""" Check if input is Apple PBZX image """
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return bool(PAT_APPLE_PBZX.search(self.input_buffer, 0, 4))
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def parse_format(self) -> bool:
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""" Parse & Extract Apple PBZX image """
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make_dirs(in_path=self.extract_path)
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cpio_bin: bytes = b'' # Initialize PBZX > CPIO Buffer
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cpio_len: int = 0x0 # Initialize PBZX > CPIO Length
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chunk_off: int = 0xC # First PBZX Chunk starts at 0xC
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while chunk_off < len(self.input_buffer):
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chunk_hdr: Any = ctypes_struct(buffer=self.input_buffer, start_offset=chunk_off, class_object=PbzxChunk)
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printer(message=f'PBZX Chunk at 0x{chunk_off:08X}\n', padding=self.padding)
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chunk_hdr.struct_print(padding=self.padding + 4)
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# PBZX Chunk data starts after its Header
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comp_bgn: int = chunk_off + self.PBZX_CHUNK_HDR_LEN
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# To avoid a potential infinite loop, double-check Compressed Size
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comp_end: int = comp_bgn + max(chunk_hdr.CompSize, self.PBZX_CHUNK_HDR_LEN)
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comp_bin: bytes = self.input_buffer[comp_bgn:comp_end]
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try:
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# Attempt XZ decompression, if applicable to Chunk data
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cpio_bin += lzma.LZMADecompressor().decompress(comp_bin)
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printer(message='Successful LZMA decompression!', padding=self.padding + 8)
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except Exception as error: # pylint: disable=broad-except
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logging.debug('Error: Failed to LZMA decompress PBZX Chunk 0x%X: %s', chunk_off, error)
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# Otherwise, Chunk data is not compressed
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cpio_bin += comp_bin
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# Final CPIO size should match the sum of all Chunks > Initial Size
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cpio_len += chunk_hdr.InitSize
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# Next Chunk starts at the end of current Chunk's data
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chunk_off = comp_end
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# Check that CPIO size is valid based on all Chunks > Initial Size
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if cpio_len != len(cpio_bin):
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printer(message='Error: Unexpected CPIO archive size!', padding=self.padding)
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return False
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cpio_name: str = path_stem(in_path=self.input_object) if isinstance(self.input_object, str) else 'Payload'
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cpio_path: str = os.path.join(self.extract_path, f'{cpio_name}.cpio')
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with open(cpio_path, 'wb') as cpio_object:
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cpio_object.write(cpio_bin)
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# Decompress PBZX > CPIO archive with 7-Zip
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if is_szip_supported(in_path=cpio_path, args=['-tCPIO']):
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if szip_decompress(in_path=cpio_path, out_path=self.extract_path, in_name='CPIO',
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padding=self.padding, args=['-tCPIO']):
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delete_file(in_path=cpio_path) # Successful extraction, delete PBZX > CPIO archive
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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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