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203 lines
9.3 KiB
Python
Executable File
203 lines
9.3 KiB
Python
Executable File
#!/usr/bin/env python
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# SPDX-FileCopyrightText: 2021 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 typing import Any, List, Optional
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from construct import Const, Int8ul, Int16ul, Int32ul, PaddedString, Struct
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from fatfsgen_utils.fat import FAT
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from fatfsgen_utils.fatfs_state import FATFSState
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from fatfsgen_utils.fs_object import Directory
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from fatfsgen_utils.utils import generate_4bytes_random, get_args_for_partition_generator, pad_string
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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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MAX_VOL_LAB_SIZE = 11
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MAX_OEM_NAME_SIZE = 8
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MAX_FS_TYPE_SIZE = 8
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BOOT_HEADER_SIZE = 512
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BOOT_SECTOR_HEADER = Struct(
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'BS_jmpBoot' / Const(b'\xeb\xfe\x90'),
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'BS_OEMName' / PaddedString(MAX_OEM_NAME_SIZE, 'utf-8'),
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'BPB_BytsPerSec' / Int16ul,
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'BPB_SecPerClus' / Int8ul,
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'BPB_RsvdSecCnt' / Int16ul,
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'BPB_NumFATs' / Int8ul,
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'BPB_RootEntCnt' / Int16ul,
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'BPB_TotSec16' / Int16ul,
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'BPB_Media' / Int8ul,
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'BPB_FATSz16' / Int16ul,
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'BPB_SecPerTrk' / Int16ul,
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'BPB_NumHeads' / Int16ul,
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'BPB_HiddSec' / Int32ul,
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'BPB_TotSec32' / Int32ul,
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'BS_DrvNum' / Const(b'\x80'),
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'BS_Reserved1' / Const(b'\x00'),
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'BS_BootSig' / Const(b'\x29'),
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'BS_VolID' / Int32ul,
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'BS_VolLab' / PaddedString(MAX_VOL_LAB_SIZE, 'utf-8'),
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'BS_FilSysType' / PaddedString(MAX_FS_TYPE_SIZE, 'utf-8'),
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'BS_EMPTY' / Const(448 * b'\x00'),
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'Signature_word' / Const(b'\x55\xAA')
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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 = 1024 * 1024,
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reserved_sectors_cnt: int = 1,
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fat_tables_cnt: int = 1,
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sectors_per_cluster: int = 1,
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sector_size: int = 0x1000,
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sectors_per_fat: int = 1,
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root_dir_sectors_cnt: int = 4,
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hidden_sectors: int = 0,
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long_names_enabled: bool = False,
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entry_size: int = 32,
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num_heads: int = 0xff,
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oem_name: str = 'MSDOS5.0',
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sec_per_track: int = 0x3f,
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volume_label: str = 'Espressif',
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file_sys_type: str = 'FAT',
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media_type: int = 0xf8) -> None:
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self.state = FATFSState(entry_size=entry_size,
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sector_size=sector_size,
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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_fat=sectors_per_fat,
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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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binary_image = bytearray(
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self.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(fatfs_state=self.state,
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reserved_sectors_cnt=self.state.reserved_sectors_cnt)
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self.root_directory = Directory(name='A', # the name is not important
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size=self.state.root_dir_sectors_cnt * self.state.sector_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, extension: str = '', path_from_root: Optional[List[str]] = None) -> 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, extension=extension, path_from_root=path_from_root)
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def create_directory(self, name: str, path_from_root: Optional[List[str]] = None) -> 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, parent=parent_dir, path_from_root=path_from_root)
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def write_content(self, path_from_root: List[str], content: str) -> 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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sectors_count = self.state.size // self.state.sector_size
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volume_uuid = generate_4bytes_random()
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return (
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FATFS.BOOT_SECTOR_HEADER.build(
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dict(BS_OEMName=pad_string(self.state.oem_name, size=FATFS.MAX_OEM_NAME_SIZE),
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BPB_BytsPerSec=self.state.sectors_per_cluster * self.state.sector_size,
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BPB_SecPerClus=self.state.sectors_per_cluster,
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BPB_RsvdSecCnt=self.state.reserved_sectors_cnt,
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BPB_NumFATs=self.state.fat_tables_cnt,
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BPB_RootEntCnt=self.state.entries_root_count,
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BPB_TotSec16=0x00 if self.state.fatfs_type == FATFSState.FAT32 else sectors_count,
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BPB_Media=self.state.media_type,
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BPB_FATSz16=self.state.sectors_per_fat_cnt,
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BPB_SecPerTrk=self.state.sec_per_track,
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BPB_NumHeads=self.state.num_heads,
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BPB_HiddSec=self.state.hidden_sectors,
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BPB_TotSec32=sectors_count if self.state.fatfs_type == FATFSState.FAT32 else 0x00,
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BS_VolID=volume_uuid,
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BS_VolLab=pad_string(self.state.volume_label, size=FATFS.MAX_VOL_LAB_SIZE),
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BS_FilSysType=pad_string(self.state.file_sys_type, size=FATFS.MAX_FS_TYPE_SIZE)
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)
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)
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+ (self.state.sector_size - FATFS.BOOT_HEADER_SIZE) * b'\x00'
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+ self.state.sectors_per_fat_cnt * self.state.fat_tables_cnt * self.state.sector_size * b'\x00'
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+ self.state.root_dir_sectors_cnt * self.state.sector_size * b'\x00'
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+ self.state.data_sectors * self.state.sector_size * b'\xff'
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)
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@staticmethod
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def read_filesystem(path: str) -> bytearray:
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with open(path, 'rb') as fs_file:
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return bytearray(fs_file.read())
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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 = os.path.join(folder_path, folder_relative_path)
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smaller_path = 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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if os.path.isfile(real_path):
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with open(real_path) 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, extension=extension, path_from_root=split_path[1:-1] or None)
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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(split_path[-1], split_path[1:-1])
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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(smaller_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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if __name__ == '__main__':
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args = get_args_for_partition_generator('Create a FAT filesystem and populate it with directory content')
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input_dir = args.input_directory
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partition_size = int(str(args.partition_size), 0)
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sector_size_bytes = int(str(args.sector_size), 0)
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fatfs = FATFS(size=partition_size, sector_size=sector_size_bytes)
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fatfs.generate(input_dir)
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fatfs.write_filesystem(args.output_file)
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