kopia lustrzana https://github.com/espressif/esp-idf
124 wiersze
5.6 KiB
Python
Executable File
124 wiersze
5.6 KiB
Python
Executable File
#!/usr/bin/env python
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# SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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# SPDX-License-Identifier: Apache-2.0
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import argparse
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import os
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import construct
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from fatfs_utils.boot_sector import BootSector
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from fatfs_utils.entry import Entry
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from fatfs_utils.fat import FAT
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from fatfs_utils.fatfs_state import BootSectorState
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from fatfs_utils.utils import FULL_BYTE, LONG_NAMES_ENCODING, PAD_CHAR, FATDefaults, lfn_checksum, read_filesystem
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from wl_fatfsgen import remove_wl
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def build_file_name(name1: bytes, name2: bytes, name3: bytes) -> str:
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full_name_ = name1 + name2 + name3
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# need to strip empty bytes and null-terminating char ('\x00')
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return full_name_.rstrip(FULL_BYTE).decode(LONG_NAMES_ENCODING).rstrip('\x00')
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def get_obj_name(obj_: dict, directory_bytes_: bytes, entry_position_: int, lfn_checksum_: int) -> str:
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obj_ext_ = obj_['DIR_Name_ext'].rstrip(chr(PAD_CHAR))
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ext_ = f'.{obj_ext_}' if len(obj_ext_) > 0 else ''
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obj_name_: str = obj_['DIR_Name'].rstrip(chr(PAD_CHAR)) + ext_ # short entry name
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if not args.long_name_support:
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return obj_name_
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full_name = {}
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for pos in range(entry_position_ - 1, -1, -1): # loop from the current entry back to the start
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obj_address_: int = FATDefaults.ENTRY_SIZE * pos
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entry_bytes_: bytes = directory_bytes_[obj_address_: obj_address_ + FATDefaults.ENTRY_SIZE]
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struct_ = Entry.parse_entry_long(entry_bytes_, lfn_checksum_)
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if len(struct_.items()) > 0:
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full_name[struct_['order']] = build_file_name(struct_['name1'], struct_['name2'], struct_['name3'])
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if struct_['is_last']:
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break
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return ''.join(map(lambda x: x[1], sorted(full_name.items()))) or obj_name_
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def traverse_folder_tree(directory_bytes_: bytes,
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name: str,
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state_: BootSectorState,
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fat_: FAT,
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binary_array_: bytes) -> None:
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os.makedirs(name)
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assert len(directory_bytes_) % FATDefaults.ENTRY_SIZE == 0
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entries_count_: int = len(directory_bytes_) // FATDefaults.ENTRY_SIZE
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for i in range(entries_count_):
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obj_address_: int = FATDefaults.ENTRY_SIZE * i
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try:
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obj_: dict = Entry.ENTRY_FORMAT_SHORT_NAME.parse(
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directory_bytes_[obj_address_: obj_address_ + FATDefaults.ENTRY_SIZE])
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except (construct.core.ConstError, UnicodeDecodeError):
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args.long_name_support = True
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continue
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if obj_['DIR_Attr'] == 0: # empty entry
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continue
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obj_name_: str = get_obj_name(obj_,
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directory_bytes_,
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entry_position_=i,
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lfn_checksum_=lfn_checksum(obj_['DIR_Name'] + obj_['DIR_Name_ext']))
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if obj_['DIR_Attr'] == Entry.ATTR_ARCHIVE:
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content_ = fat_.get_chained_content(cluster_id_=Entry.get_cluster_id(obj_),
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size=obj_['DIR_FileSize'])
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with open(os.path.join(name, obj_name_), 'wb') as new_file:
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new_file.write(content_)
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elif obj_['DIR_Attr'] == Entry.ATTR_DIRECTORY:
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# avoid creating symlinks to itself and parent folder
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if obj_name_ in ('.', '..'):
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continue
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child_directory_bytes_ = fat_.get_chained_content(cluster_id_=obj_['DIR_FstClusLO'])
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traverse_folder_tree(directory_bytes_=child_directory_bytes_,
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name=os.path.join(name, obj_name_),
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state_=state_,
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fat_=fat_,
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binary_array_=binary_array_)
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if __name__ == '__main__':
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desc = 'Tool for parsing fatfs image and extracting directory structure on host.'
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argument_parser: argparse.ArgumentParser = argparse.ArgumentParser(description=desc)
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argument_parser.add_argument('input_image',
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help='Path to the image that will be parsed and extracted.')
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argument_parser.add_argument('--long-name-support',
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action='store_true',
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help=argparse.SUPPRESS)
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argument_parser.add_argument('--wear-leveling',
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action='store_true',
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help='Set flag to parse an image encoded using wear levelling.')
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args = argument_parser.parse_args()
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fs = read_filesystem(args.input_image)
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# An algorithm for removing wear levelling:
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# 1. find an remove dummy sector:
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# a) dummy sector is at the position defined by the number of records in the state sector
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# b) dummy may not be placed in state nor cfg sectors
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# c) first (boot) sector position (boot_s_pos) is calculated using value of move count
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# boot_s_pos = - mc
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# 2. remove state sectors (trivial)
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# 3. remove cfg sector (trivial)
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# 4. valid fs is then old_fs[-mc:] + old_fs[:-mc]
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if args.wear_leveling:
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fs = remove_wl(fs)
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boot_sector_ = BootSector()
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boot_sector_.parse_boot_sector(fs)
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fat = FAT(boot_sector_.boot_sector_state, init_=False)
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boot_dir_start_ = boot_sector_.boot_sector_state.root_directory_start
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boot_dir_sectors = boot_sector_.boot_sector_state.root_dir_sectors_cnt
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full_ = fs[boot_dir_start_: boot_dir_start_ + boot_dir_sectors * boot_sector_.boot_sector_state.sector_size]
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traverse_folder_tree(full_,
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boot_sector_.boot_sector_state.volume_label.rstrip(chr(PAD_CHAR)),
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boot_sector_.boot_sector_state, fat, fs)
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