mirror of
https://github.com/espressif/esp-idf.git
synced 2025-10-31 13:09:38 +00:00
246 lines
12 KiB
Python
Executable File
246 lines
12 KiB
Python
Executable File
#!/usr/bin/env python
|
|
# SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
|
|
# SPDX-License-Identifier: Apache-2.0
|
|
|
|
import os
|
|
from datetime import datetime
|
|
from typing import Any, List, Optional
|
|
|
|
from fatfs_utils.boot_sector import BootSector
|
|
from fatfs_utils.exceptions import NoFreeClusterException
|
|
from fatfs_utils.fat import FAT
|
|
from fatfs_utils.fatfs_state import FATFSState
|
|
from fatfs_utils.fs_object import Directory
|
|
from fatfs_utils.long_filename_utils import get_required_lfn_entries_count
|
|
from fatfs_utils.utils import (BYTES_PER_DIRECTORY_ENTRY, FATFS_INCEPTION, FATFS_MIN_ALLOC_UNIT,
|
|
RESERVED_CLUSTERS_COUNT, FATDefaults, get_args_for_partition_generator,
|
|
get_fat_sectors_count, get_non_data_sectors_cnt, read_filesystem,
|
|
required_clusters_count)
|
|
|
|
|
|
class FATFS:
|
|
"""
|
|
The class FATFS provides API for generating FAT file system.
|
|
It contains reference to the FAT table and to the root directory.
|
|
"""
|
|
|
|
def __init__(self,
|
|
binary_image_path: Optional[str] = None,
|
|
size: int = FATDefaults.SIZE,
|
|
reserved_sectors_cnt: int = FATDefaults.RESERVED_SECTORS_COUNT,
|
|
fat_tables_cnt: int = FATDefaults.FAT_TABLES_COUNT,
|
|
sectors_per_cluster: int = FATDefaults.SECTORS_PER_CLUSTER,
|
|
sector_size: int = FATDefaults.SECTOR_SIZE,
|
|
hidden_sectors: int = FATDefaults.HIDDEN_SECTORS,
|
|
long_names_enabled: bool = False,
|
|
use_default_datetime: bool = True,
|
|
num_heads: int = FATDefaults.NUM_HEADS,
|
|
oem_name: str = FATDefaults.OEM_NAME,
|
|
sec_per_track: int = FATDefaults.SEC_PER_TRACK,
|
|
volume_label: str = FATDefaults.VOLUME_LABEL,
|
|
file_sys_type: str = FATDefaults.FILE_SYS_TYPE,
|
|
root_entry_count: int = FATDefaults.ROOT_ENTRIES_COUNT,
|
|
explicit_fat_type: int = None,
|
|
media_type: int = FATDefaults.MEDIA_TYPE) -> None:
|
|
# root directory bytes should be aligned by sector size
|
|
assert (root_entry_count * BYTES_PER_DIRECTORY_ENTRY) % sector_size == 0
|
|
# number of bytes in the root dir must be even multiple of BPB_BytsPerSec
|
|
assert ((root_entry_count * BYTES_PER_DIRECTORY_ENTRY) // sector_size) % 2 == 0
|
|
|
|
root_dir_sectors_cnt: int = (root_entry_count * BYTES_PER_DIRECTORY_ENTRY) // sector_size
|
|
|
|
self.state: FATFSState = FATFSState(sector_size=sector_size,
|
|
explicit_fat_type=explicit_fat_type,
|
|
reserved_sectors_cnt=reserved_sectors_cnt,
|
|
root_dir_sectors_cnt=root_dir_sectors_cnt,
|
|
size=size,
|
|
file_sys_type=file_sys_type,
|
|
num_heads=num_heads,
|
|
fat_tables_cnt=fat_tables_cnt,
|
|
sectors_per_cluster=sectors_per_cluster,
|
|
media_type=media_type,
|
|
hidden_sectors=hidden_sectors,
|
|
sec_per_track=sec_per_track,
|
|
long_names_enabled=long_names_enabled,
|
|
volume_label=volume_label,
|
|
oem_name=oem_name,
|
|
use_default_datetime=use_default_datetime)
|
|
binary_image: bytes = bytearray(
|
|
read_filesystem(binary_image_path) if binary_image_path else self.create_empty_fatfs())
|
|
self.state.binary_image = binary_image
|
|
|
|
self.fat: FAT = FAT(boot_sector_state=self.state.boot_sector_state, init_=True)
|
|
|
|
root_dir_size = self.state.boot_sector_state.root_dir_sectors_cnt * self.state.boot_sector_state.sector_size
|
|
self.root_directory: Directory = Directory(name='A', # the name is not important, must be string
|
|
size=root_dir_size,
|
|
fat=self.fat,
|
|
cluster=self.fat.clusters[1],
|
|
fatfs_state=self.state)
|
|
self.root_directory.init_directory()
|
|
|
|
def create_file(self, name: str,
|
|
extension: str = '',
|
|
path_from_root: Optional[List[str]] = None,
|
|
object_timestamp_: datetime = FATFS_INCEPTION,
|
|
is_empty: bool = False) -> None:
|
|
"""
|
|
Root directory recursively finds the parent directory of the new file, allocates cluster,
|
|
entry and appends a new file into the parent directory.
|
|
|
|
When path_from_root is None the dir is root.
|
|
|
|
:param name: The name of the file.
|
|
:param extension: The extension of the file.
|
|
:param path_from_root: List of strings containing names of the ancestor directories in the given order.
|
|
:param object_timestamp_: is not None, this will be propagated to the file's entry
|
|
:param is_empty: True if there is no need to allocate any cluster, otherwise False
|
|
"""
|
|
self.root_directory.new_file(name=name,
|
|
extension=extension,
|
|
path_from_root=path_from_root,
|
|
object_timestamp_=object_timestamp_,
|
|
is_empty=is_empty)
|
|
|
|
def create_directory(self, name: str,
|
|
path_from_root: Optional[List[str]] = None,
|
|
object_timestamp_: datetime = FATFS_INCEPTION) -> None:
|
|
"""
|
|
Initially recursively finds a parent of the new directory
|
|
and then create a new directory inside the parent.
|
|
|
|
When path_from_root is None the parent dir is root.
|
|
|
|
:param name: The full name of the directory (excluding its path)
|
|
:param path_from_root: List of strings containing names of the ancestor directories in the given order.
|
|
:param object_timestamp_: in case the user preserves the timestamps, this will be propagated to the
|
|
metadata of the directory (to the corresponding entry)
|
|
:returns: None
|
|
"""
|
|
parent_dir = self.root_directory
|
|
if path_from_root:
|
|
parent_dir = self.root_directory.recursive_search(path_from_root, self.root_directory)
|
|
|
|
self.root_directory.new_directory(name=name,
|
|
parent=parent_dir,
|
|
path_from_root=path_from_root,
|
|
object_timestamp_=object_timestamp_)
|
|
|
|
def write_content(self, path_from_root: List[str], content: bytes) -> None:
|
|
"""
|
|
fat fs invokes root directory to recursively find the required file and writes the content
|
|
"""
|
|
self.root_directory.write_to_file(path_from_root, content)
|
|
|
|
def create_empty_fatfs(self) -> Any:
|
|
boot_sector_ = BootSector(boot_sector_state=self.state.boot_sector_state)
|
|
boot_sector_.generate_boot_sector()
|
|
return boot_sector_.binary_image
|
|
|
|
def write_filesystem(self, output_path: str) -> None:
|
|
with open(output_path, 'wb') as output:
|
|
output.write(bytearray(self.state.binary_image))
|
|
|
|
def _generate_partition_from_folder(self,
|
|
folder_relative_path: str,
|
|
folder_path: str = '',
|
|
is_dir: bool = False) -> None:
|
|
"""
|
|
Given path to folder and folder name recursively encodes folder into binary image.
|
|
Used by method generate.
|
|
"""
|
|
real_path: str = os.path.join(folder_path, folder_relative_path)
|
|
lower_path: str = folder_relative_path
|
|
|
|
folder_relative_path = folder_relative_path.upper()
|
|
|
|
normal_path = os.path.normpath(folder_relative_path)
|
|
split_path = normal_path.split(os.sep)
|
|
object_timestamp = datetime.fromtimestamp(os.path.getctime(real_path))
|
|
|
|
if os.path.isfile(real_path):
|
|
with open(real_path, 'rb') as file:
|
|
content = file.read()
|
|
file_name, extension = os.path.splitext(split_path[-1])
|
|
extension = extension[1:] # remove the dot from the extension
|
|
self.create_file(name=file_name,
|
|
extension=extension,
|
|
path_from_root=split_path[1:-1] or None,
|
|
object_timestamp_=object_timestamp,
|
|
is_empty=len(content) == 0)
|
|
self.write_content(split_path[1:], content)
|
|
elif os.path.isdir(real_path):
|
|
if not is_dir:
|
|
self.create_directory(name=split_path[-1],
|
|
path_from_root=split_path[1:-1],
|
|
object_timestamp_=object_timestamp)
|
|
|
|
# sorting files for better testability
|
|
dir_content = list(sorted(os.listdir(real_path)))
|
|
for path in dir_content:
|
|
self._generate_partition_from_folder(os.path.join(lower_path, path), folder_path=folder_path)
|
|
|
|
def generate(self, input_directory: str) -> None:
|
|
"""
|
|
Normalize path to folder and recursively encode folder to binary image
|
|
"""
|
|
path_to_folder, folder_name = os.path.split(input_directory)
|
|
self._generate_partition_from_folder(folder_name, folder_path=path_to_folder, is_dir=True)
|
|
|
|
|
|
def calculate_min_space(path: List[str],
|
|
fs_entity: str,
|
|
sector_size: int = 0x1000,
|
|
long_file_names: bool = False,
|
|
is_root: bool = False) -> int:
|
|
if os.path.isfile(os.path.join(*path, fs_entity)):
|
|
with open(os.path.join(*path, fs_entity), 'rb') as file_:
|
|
content = file_.read()
|
|
res: int = required_clusters_count(sector_size, content)
|
|
return res
|
|
buff: int = 0
|
|
dir_size = 2 * FATDefaults.ENTRY_SIZE # record for symlinks "." and ".."
|
|
for file in sorted(os.listdir(os.path.join(*path, fs_entity))):
|
|
if long_file_names and True:
|
|
# LFN entries + one short entry
|
|
dir_size += (get_required_lfn_entries_count(fs_entity) + 1) * FATDefaults.ENTRY_SIZE
|
|
else:
|
|
dir_size += FATDefaults.ENTRY_SIZE
|
|
buff += calculate_min_space(path + [fs_entity], file, sector_size, long_file_names, is_root=False)
|
|
if is_root and dir_size // FATDefaults.ENTRY_SIZE > FATDefaults.ROOT_ENTRIES_COUNT:
|
|
raise NoFreeClusterException('Not enough space in root!')
|
|
|
|
# roundup sectors, at least one is required
|
|
buff += (dir_size + sector_size - 1) // sector_size
|
|
return buff
|
|
|
|
|
|
def main() -> None:
|
|
args = get_args_for_partition_generator('Create a FAT filesystem and populate it with directory content', wl=False)
|
|
|
|
if args.partition_size == -1:
|
|
clusters = calculate_min_space([], args.input_directory, args.sector_size, long_file_names=True, is_root=True)
|
|
fats = get_fat_sectors_count(clusters, args.sector_size)
|
|
root_dir_sectors = (FATDefaults.ROOT_ENTRIES_COUNT * FATDefaults.ENTRY_SIZE) // args.sector_size
|
|
args.partition_size = max(FATFS_MIN_ALLOC_UNIT * args.sector_size,
|
|
(clusters + fats + get_non_data_sectors_cnt(RESERVED_CLUSTERS_COUNT,
|
|
fats,
|
|
root_dir_sectors)
|
|
) * args.sector_size
|
|
)
|
|
|
|
fatfs = FATFS(sector_size=args.sector_size,
|
|
sectors_per_cluster=args.sectors_per_cluster,
|
|
size=args.partition_size,
|
|
root_entry_count=args.root_entry_count,
|
|
explicit_fat_type=args.fat_type,
|
|
long_names_enabled=args.long_name_support,
|
|
use_default_datetime=args.use_default_datetime)
|
|
|
|
fatfs.generate(args.input_directory)
|
|
fatfs.write_filesystem(args.output_file)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|