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178 lines
8.7 KiB
Python
Executable File
178 lines
8.7 KiB
Python
Executable File
#!/usr/bin/env python
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# SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
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# SPDX-License-Identifier: Apache-2.0
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import os
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from datetime import datetime
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from typing import Any, List, Optional
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from fatfs_utils.boot_sector import BootSector
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from fatfs_utils.fat import FAT
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from fatfs_utils.fatfs_state import FATFSState
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from fatfs_utils.fs_object import Directory
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from fatfs_utils.utils import (BYTES_PER_DIRECTORY_ENTRY, FATFS_INCEPTION, FATDefaults,
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get_args_for_partition_generator, read_filesystem)
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class FATFS:
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"""
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The class FATFS provides API for generating FAT file system.
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It contains reference to the FAT table and to the root directory.
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"""
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def __init__(self,
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binary_image_path: Optional[str] = None,
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size: int = FATDefaults.SIZE,
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reserved_sectors_cnt: int = FATDefaults.RESERVED_SECTORS_COUNT,
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fat_tables_cnt: int = FATDefaults.FAT_TABLES_COUNT,
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sectors_per_cluster: int = FATDefaults.SECTORS_PER_CLUSTER,
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sector_size: int = FATDefaults.SECTOR_SIZE,
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hidden_sectors: int = FATDefaults.HIDDEN_SECTORS,
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long_names_enabled: bool = False,
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use_default_datetime: bool = True,
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num_heads: int = FATDefaults.NUM_HEADS,
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oem_name: str = FATDefaults.OEM_NAME,
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sec_per_track: int = FATDefaults.SEC_PER_TRACK,
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volume_label: str = FATDefaults.VOLUME_LABEL,
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file_sys_type: str = FATDefaults.FILE_SYS_TYPE,
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root_entry_count: int = FATDefaults.ROOT_ENTRIES_COUNT,
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explicit_fat_type: int = None,
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media_type: int = FATDefaults.MEDIA_TYPE) -> None:
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# root directory bytes should be aligned by sector size
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assert (root_entry_count * BYTES_PER_DIRECTORY_ENTRY) % sector_size == 0
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# number of bytes in the root dir must be even multiple of BPB_BytsPerSec
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assert ((root_entry_count * BYTES_PER_DIRECTORY_ENTRY) // sector_size) % 2 == 0
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root_dir_sectors_cnt: int = (root_entry_count * BYTES_PER_DIRECTORY_ENTRY) // sector_size
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self.state: FATFSState = FATFSState(sector_size=sector_size,
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explicit_fat_type=explicit_fat_type,
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reserved_sectors_cnt=reserved_sectors_cnt,
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root_dir_sectors_cnt=root_dir_sectors_cnt,
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size=size,
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file_sys_type=file_sys_type,
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num_heads=num_heads,
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fat_tables_cnt=fat_tables_cnt,
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sectors_per_cluster=sectors_per_cluster,
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media_type=media_type,
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hidden_sectors=hidden_sectors,
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sec_per_track=sec_per_track,
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long_names_enabled=long_names_enabled,
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volume_label=volume_label,
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oem_name=oem_name,
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use_default_datetime=use_default_datetime)
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binary_image: bytes = bytearray(
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read_filesystem(binary_image_path) if binary_image_path else self.create_empty_fatfs())
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self.state.binary_image = binary_image
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self.fat: FAT = FAT(boot_sector_state=self.state.boot_sector_state, init_=True)
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root_dir_size = self.state.boot_sector_state.root_dir_sectors_cnt * self.state.boot_sector_state.sector_size
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self.root_directory: Directory = Directory(name='A', # the name is not important, must be string
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size=root_dir_size,
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fat=self.fat,
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cluster=self.fat.clusters[1],
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fatfs_state=self.state)
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self.root_directory.init_directory()
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def create_file(self, name: str,
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extension: str = '',
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path_from_root: Optional[List[str]] = None,
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object_timestamp_: datetime = FATFS_INCEPTION) -> None:
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# when path_from_root is None the dir is root
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self.root_directory.new_file(name=name,
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extension=extension,
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path_from_root=path_from_root,
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object_timestamp_=object_timestamp_)
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def create_directory(self, name: str,
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path_from_root: Optional[List[str]] = None,
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object_timestamp_: datetime = FATFS_INCEPTION) -> None:
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# when path_from_root is None the dir is root
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parent_dir = self.root_directory
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if path_from_root:
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parent_dir = self.root_directory.recursive_search(path_from_root, self.root_directory)
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self.root_directory.new_directory(name=name,
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parent=parent_dir,
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path_from_root=path_from_root,
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object_timestamp_=object_timestamp_)
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def write_content(self, path_from_root: List[str], content: bytes) -> None:
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"""
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fat fs invokes root directory to recursively find the required file and writes the content
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"""
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self.root_directory.write_to_file(path_from_root, content)
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def create_empty_fatfs(self) -> Any:
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boot_sector_ = BootSector(boot_sector_state=self.state.boot_sector_state)
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boot_sector_.generate_boot_sector()
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return boot_sector_.binary_image
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def write_filesystem(self, output_path: str) -> None:
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with open(output_path, 'wb') as output:
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output.write(bytearray(self.state.binary_image))
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def _generate_partition_from_folder(self,
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folder_relative_path: str,
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folder_path: str = '',
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is_dir: bool = False) -> None:
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"""
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Given path to folder and folder name recursively encodes folder into binary image.
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Used by method generate.
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"""
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real_path: str = os.path.join(folder_path, folder_relative_path)
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lower_path: str = folder_relative_path
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folder_relative_path = folder_relative_path.upper()
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normal_path = os.path.normpath(folder_relative_path)
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split_path = normal_path.split(os.sep)
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object_timestamp = datetime.fromtimestamp(os.path.getctime(real_path))
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if os.path.isfile(real_path):
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with open(real_path, 'rb') as file:
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content = file.read()
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file_name, extension = os.path.splitext(split_path[-1])
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extension = extension[1:] # remove the dot from the extension
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self.create_file(name=file_name,
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extension=extension,
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path_from_root=split_path[1:-1] or None,
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object_timestamp_=object_timestamp)
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self.write_content(split_path[1:], content)
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elif os.path.isdir(real_path):
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if not is_dir:
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self.create_directory(name=split_path[-1],
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path_from_root=split_path[1:-1],
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object_timestamp_=object_timestamp)
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# sorting files for better testability
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dir_content = list(sorted(os.listdir(real_path)))
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for path in dir_content:
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self._generate_partition_from_folder(os.path.join(lower_path, path), folder_path=folder_path)
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def generate(self, input_directory: str) -> None:
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"""
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Normalize path to folder and recursively encode folder to binary image
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"""
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path_to_folder, folder_name = os.path.split(input_directory)
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self._generate_partition_from_folder(folder_name, folder_path=path_to_folder, is_dir=True)
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def main() -> None:
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args = get_args_for_partition_generator('Create a FAT filesystem and populate it with directory content')
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fatfs = FATFS(sector_size=args.sector_size,
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sectors_per_cluster=args.sectors_per_cluster,
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size=args.partition_size,
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root_entry_count=args.root_entry_count,
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explicit_fat_type=args.fat_type,
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long_names_enabled=args.long_name_support,
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use_default_datetime=args.use_default_datetime)
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fatfs.generate(args.input_directory)
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fatfs.write_filesystem(args.output_file)
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if __name__ == '__main__':
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main()
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