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97 lines
3.3 KiB
Python
97 lines
3.3 KiB
Python
# SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
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# SPDX-License-Identifier: Apache-2.0
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class FATFSState:
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"""
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The class represents the state and the configuration of the FATFS.
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"""
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FAT12_MAX_CLUSTERS = 4085
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FAT16_MAX_CLUSTERS = 65525
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FAT12 = 12
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FAT16 = 16
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FAT32 = 32
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def __init__(self,
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entry_size: int,
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sector_size: int,
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reserved_sectors_cnt: int,
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root_dir_sectors_cnt: int,
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size: int,
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media_type: int,
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sectors_per_fat: int,
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sectors_per_cluster: int,
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volume_label: str,
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oem_name: str,
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fat_tables_cnt: int,
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sec_per_track: int,
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num_heads: int,
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hidden_sectors: int,
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file_sys_type: str,
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long_names_enabled: bool = False):
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self._binary_image: bytearray = bytearray(b'')
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self.fat_tables_cnt: int = fat_tables_cnt
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self.oem_name: str = oem_name
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self.file_sys_type: str = file_sys_type
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self.sec_per_track: int = sec_per_track
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self.hidden_sectors: int = hidden_sectors
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self.volume_label: str = volume_label
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self.media_type: int = media_type
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self.long_names_enabled: bool = long_names_enabled
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self.entry_size: int = entry_size
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self.num_heads: int = num_heads
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self.sector_size: int = sector_size
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self.root_dir_sectors_cnt: int = root_dir_sectors_cnt
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self.reserved_sectors_cnt: int = reserved_sectors_cnt
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self.size: int = size
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self.sectors_per_fat_cnt: int = sectors_per_fat
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self.sectors_per_cluster: int = sectors_per_cluster
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@property
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def binary_image(self) -> bytearray:
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return self._binary_image
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@binary_image.setter
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def binary_image(self, value: bytearray) -> None:
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self._binary_image = value
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def get_dir_size(self, is_root: bool) -> int:
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return self.root_dir_sectors_cnt * self.sector_size if is_root else self.sector_size
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@property
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def start_address(self) -> int:
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return self.sector_size * self.reserved_sectors_cnt
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@property
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def data_sectors(self) -> int:
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return (self.size // self.sector_size) - self.non_data_sectors
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@property
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def non_data_sectors(self) -> int:
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return self.reserved_sectors_cnt + self.sectors_per_fat_cnt + self.root_dir_sectors_cnt
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@property
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def data_region_start(self) -> int:
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return self.non_data_sectors * self.sector_size
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@property
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def max_clusters(self) -> int:
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return self.data_sectors // self.sectors_per_cluster
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@property
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def root_directory_start(self) -> int:
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return (self.reserved_sectors_cnt + self.sectors_per_fat_cnt) * self.sector_size
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@property
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def fatfs_type(self) -> int:
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if self.max_clusters < FATFSState.FAT12_MAX_CLUSTERS:
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return FATFSState.FAT12
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elif self.max_clusters < FATFSState.FAT16_MAX_CLUSTERS:
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return FATFSState.FAT16
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# fat is FAT.FAT32, not supported now
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raise NotImplementedError('FAT32 is currently not supported.')
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@property
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def entries_root_count(self) -> int:
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return (self.root_dir_sectors_cnt * self.sector_size) // self.entry_size
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