kopia lustrzana https://github.com/espressif/esp-idf
114 wiersze
4.3 KiB
Python
114 wiersze
4.3 KiB
Python
# SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
|
|
# SPDX-License-Identifier: Apache-2.0
|
|
|
|
from textwrap import dedent
|
|
|
|
from .exceptions import InconsistentFATAttributes
|
|
from .utils import (FAT12, FAT12_MAX_CLUSTERS, FAT16, FAT16_MAX_CLUSTERS, get_fatfs_type, get_non_data_sectors_cnt,
|
|
number_of_clusters)
|
|
|
|
|
|
class FATFSState:
|
|
"""
|
|
The class represents the state and the configuration of the FATFS.
|
|
"""
|
|
|
|
def __init__(self,
|
|
entry_size: int,
|
|
sector_size: int,
|
|
reserved_sectors_cnt: int,
|
|
root_dir_sectors_cnt: int,
|
|
size: int,
|
|
media_type: int,
|
|
sectors_per_fat: int,
|
|
sectors_per_cluster: int,
|
|
volume_label: str,
|
|
oem_name: str,
|
|
fat_tables_cnt: int,
|
|
sec_per_track: int,
|
|
num_heads: int,
|
|
hidden_sectors: int,
|
|
file_sys_type: str,
|
|
explicit_fat_type: int = None,
|
|
long_names_enabled: bool = False):
|
|
|
|
self._explicit_fat_type = explicit_fat_type
|
|
self._binary_image: bytearray = bytearray(b'')
|
|
self.fat_tables_cnt: int = fat_tables_cnt
|
|
self.oem_name: str = oem_name
|
|
self.file_sys_type: str = file_sys_type
|
|
self.sec_per_track: int = sec_per_track
|
|
self.hidden_sectors: int = hidden_sectors
|
|
self.volume_label: str = volume_label
|
|
self.media_type: int = media_type
|
|
self.long_names_enabled: bool = long_names_enabled
|
|
self.entry_size: int = entry_size
|
|
self.num_heads: int = num_heads
|
|
self.sector_size: int = sector_size
|
|
self.root_dir_sectors_cnt: int = root_dir_sectors_cnt
|
|
self.reserved_sectors_cnt: int = reserved_sectors_cnt
|
|
self.size: int = size
|
|
self.sectors_per_fat_cnt: int = sectors_per_fat
|
|
self.sectors_per_cluster: int = sectors_per_cluster
|
|
|
|
if self.clusters in (FAT12_MAX_CLUSTERS, FAT16_MAX_CLUSTERS):
|
|
print('WARNING: It is not recommended to create FATFS with bounding '
|
|
f'count of clusters: {FAT12_MAX_CLUSTERS} or {FAT16_MAX_CLUSTERS}')
|
|
self.check_fat_type()
|
|
|
|
@property
|
|
def binary_image(self) -> bytearray:
|
|
return self._binary_image
|
|
|
|
@binary_image.setter
|
|
def binary_image(self, value: bytearray) -> None:
|
|
self._binary_image = value
|
|
|
|
def get_dir_size(self, is_root: bool) -> int:
|
|
return self.root_dir_sectors_cnt * self.sector_size if is_root else self.sector_size
|
|
|
|
@property
|
|
def start_address(self) -> int:
|
|
return self.sector_size * self.reserved_sectors_cnt
|
|
|
|
@property
|
|
def data_sectors(self) -> int:
|
|
return (self.size // self.sector_size) - self.non_data_sectors
|
|
|
|
@property
|
|
def non_data_sectors(self) -> int:
|
|
return get_non_data_sectors_cnt(self.reserved_sectors_cnt, self.sectors_per_fat_cnt, # type: ignore
|
|
self.root_dir_sectors_cnt)
|
|
|
|
@property
|
|
def data_region_start(self) -> int:
|
|
return self.non_data_sectors * self.sector_size
|
|
|
|
@property
|
|
def clusters(self) -> int:
|
|
return number_of_clusters(self.data_sectors, self.sectors_per_cluster) # type: ignore
|
|
|
|
@property
|
|
def root_directory_start(self) -> int:
|
|
return (self.reserved_sectors_cnt + self.sectors_per_fat_cnt) * self.sector_size
|
|
|
|
def check_fat_type(self) -> None:
|
|
_type = self.fatfs_type
|
|
if self._explicit_fat_type is not None and self._explicit_fat_type != _type:
|
|
raise InconsistentFATAttributes(dedent(
|
|
f"""FAT type you specified is inconsistent with other attributes of the system.
|
|
The specified FATFS type: FAT{self._explicit_fat_type}
|
|
The actual FATFS type: FAT{_type}"""))
|
|
if _type not in (FAT12, FAT16):
|
|
raise NotImplementedError('FAT32 is currently not supported.')
|
|
|
|
@property
|
|
def fatfs_type(self) -> int:
|
|
# variable typed_fatfs_type must be explicitly typed to avoid mypy error
|
|
typed_fatfs_type: int = get_fatfs_type(self.clusters)
|
|
return typed_fatfs_type
|
|
|
|
@property
|
|
def entries_root_count(self) -> int:
|
|
return (self.root_dir_sectors_cnt * self.sector_size) // self.entry_size
|