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284 lines
10 KiB
Python
284 lines
10 KiB
Python
# SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
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# SPDX-License-Identifier: Apache-2.0
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import argparse
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import binascii
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import os
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import uuid
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from datetime import datetime
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from typing import List, Optional, Tuple
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from construct import BitsInteger, BitStruct, Int16ul
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FAT12_MAX_CLUSTERS: int = 4085
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FAT16_MAX_CLUSTERS: int = 65525
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PAD_CHAR: int = 0x20
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FAT12: int = 12
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FAT16: int = 16
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FAT32: int = 32
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FULL_BYTE: bytes = b'\xff'
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EMPTY_BYTE: bytes = b'\x00'
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# redundant
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BYTES_PER_DIRECTORY_ENTRY: int = 32
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UINT32_MAX: int = (1 << 32) - 1
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MAX_NAME_SIZE: int = 8
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MAX_EXT_SIZE: int = 3
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DATETIME = Tuple[int, int, int]
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FATFS_INCEPTION_YEAR: int = 1980
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FATFS_INCEPTION: datetime = datetime(FATFS_INCEPTION_YEAR, 1, 1, 0, 0, 0, 0)
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FATFS_MAX_HOURS = 24
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FATFS_MAX_MINUTES = 60
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FATFS_MAX_SECONDS = 60
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FATFS_MAX_DAYS = 31
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FATFS_MAX_MONTHS = 12
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FATFS_MAX_YEARS = 127
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FATFS_SECONDS_GRANULARITY: int = 2
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# long names are encoded to two bytes in utf-16
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LONG_NAMES_ENCODING: str = 'utf-16'
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SHORT_NAMES_ENCODING: str = 'utf-8'
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ALLOWED_SECTOR_SIZES: List[int] = [4096]
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ALLOWED_SECTORS_PER_CLUSTER: List[int] = [1, 2, 4, 8, 16, 32, 64, 128]
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def crc32(input_values: List[int], crc: int) -> int:
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"""
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Name Polynomial Reversed? Init-value XOR-out
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crc32 0x104C11DB7 True 4294967295 (UINT32_MAX) 0xFFFFFFFF
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"""
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return binascii.crc32(bytearray(input_values), crc)
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def number_of_clusters(number_of_sectors: int, sectors_per_cluster: int) -> int:
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return number_of_sectors // sectors_per_cluster
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def get_non_data_sectors_cnt(reserved_sectors_cnt: int, sectors_per_fat_cnt: int, root_dir_sectors_cnt: int) -> int:
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return reserved_sectors_cnt + sectors_per_fat_cnt + root_dir_sectors_cnt
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def get_fatfs_type(clusters_count: int) -> int:
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if clusters_count < FAT12_MAX_CLUSTERS:
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return FAT12
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if clusters_count <= FAT16_MAX_CLUSTERS:
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return FAT16
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return FAT32
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def get_fat_sectors_count(clusters_count: int, sector_size: int) -> int:
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fatfs_type_ = get_fatfs_type(clusters_count)
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if fatfs_type_ == FAT32:
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raise NotImplementedError('FAT32 is not supported!')
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# number of byte halves
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cluster_s: int = fatfs_type_ // 4
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fat_size_bytes: int = (
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clusters_count * 2 + cluster_s) if fatfs_type_ == FAT16 else (clusters_count * 3 + 1) // 2 + cluster_s
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return (fat_size_bytes + sector_size - 1) // sector_size
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def required_clusters_count(cluster_size: int, content: bytes) -> int:
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# compute number of required clusters for file text
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return (len(content) + cluster_size - 1) // cluster_size
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def generate_4bytes_random() -> int:
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return uuid.uuid4().int & 0xFFFFFFFF
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def pad_string(content: str, size: Optional[int] = None, pad: int = PAD_CHAR) -> str:
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# cut string if longer and fill with pad character if shorter than size
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return content.ljust(size or len(content), chr(pad))[:size]
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def right_strip_string(content: str, pad: int = PAD_CHAR) -> str:
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return content.rstrip(chr(pad))
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def build_lfn_short_entry_name(name: str, extension: str, order: int) -> str:
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return '{}{}'.format(pad_string(content=name[:MAX_NAME_SIZE - 2] + '~' + chr(order), size=MAX_NAME_SIZE),
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pad_string(extension[:MAX_EXT_SIZE], size=MAX_EXT_SIZE))
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def lfn_checksum(short_entry_name: str) -> int:
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"""
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Function defined by FAT specification. Computes checksum out of name in the short file name entry.
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"""
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checksum_result = 0
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for i in range(MAX_NAME_SIZE + MAX_EXT_SIZE):
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# operation is a right rotation on 8 bits (Python equivalent for unsigned char in C)
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checksum_result = (0x80 if checksum_result & 1 else 0x00) + (checksum_result >> 1) + ord(short_entry_name[i])
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checksum_result &= 0xff
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return checksum_result
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def convert_to_utf16_and_pad(content: str,
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expected_size: int,
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pad: bytes = FULL_BYTE,
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terminator: bytes = b'\x00\x00') -> bytes:
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# we need to get rid of the Byte order mark 0xfeff or 0xfffe, fatfs does not use it
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bom_utf16: bytes = b'\xfe\xff'
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encoded_content_utf16: bytes = content.encode(LONG_NAMES_ENCODING)[len(bom_utf16):]
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terminated_encoded_content_utf16: bytes = (encoded_content_utf16 + terminator) if (2 * expected_size > len(
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encoded_content_utf16) > 0) else encoded_content_utf16
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return terminated_encoded_content_utf16.ljust(2 * expected_size, pad)
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def split_to_name_and_extension(full_name: str) -> Tuple[str, str]:
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name, extension = os.path.splitext(full_name)
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return name, extension.replace('.', '')
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def is_valid_fatfs_name(string: str) -> bool:
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return string == string.upper()
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def split_by_half_byte_12_bit_little_endian(value: int) -> Tuple[int, int, int]:
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value_as_bytes: bytes = Int16ul.build(value)
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return value_as_bytes[0] & 0x0f, value_as_bytes[0] >> 4, value_as_bytes[1] & 0x0f
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def merge_by_half_byte_12_bit_little_endian(v1: int, v2: int, v3: int) -> int:
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return v1 | v2 << 4 | v3 << 8
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def build_byte(first_half: int, second_half: int) -> int:
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return (first_half << 4) | second_half
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def split_content_into_sectors(content: bytes, sector_size: int) -> List[bytes]:
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result = []
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clusters_cnt: int = required_clusters_count(cluster_size=sector_size, content=content)
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for i in range(clusters_cnt):
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result.append(content[sector_size * i:(i + 1) * sector_size])
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return result
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def get_args_for_partition_generator(desc: str) -> argparse.Namespace:
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parser: argparse.ArgumentParser = argparse.ArgumentParser(description=desc)
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parser.add_argument('input_directory',
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help='Path to the directory that will be encoded into fatfs image')
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parser.add_argument('--output_file',
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default='fatfs_image.img',
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help='Filename of the generated fatfs image')
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parser.add_argument('--partition_size',
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default=FATDefaults.SIZE,
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help='Size of the partition in bytes')
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parser.add_argument('--sector_size',
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default=FATDefaults.SECTOR_SIZE,
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type=int,
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choices=ALLOWED_SECTOR_SIZES,
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help='Size of the partition in bytes')
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parser.add_argument('--sectors_per_cluster',
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default=1,
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type=int,
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choices=ALLOWED_SECTORS_PER_CLUSTER,
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help='Number of sectors per cluster')
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parser.add_argument('--root_entry_count',
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default=FATDefaults.ROOT_ENTRIES_COUNT,
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help='Number of entries in the root directory')
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parser.add_argument('--long_name_support',
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action='store_true',
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help='Set flag to enable long names support.')
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parser.add_argument('--use_default_datetime',
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action='store_true',
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help='For test purposes. If the flag is set the files are created with '
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'the default timestamp that is the 1st of January 1980')
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parser.add_argument('--fat_type',
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default=0,
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type=int,
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choices=[FAT12, FAT16, 0],
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help="""
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Type of fat. Select 12 for fat12, 16 for fat16. Don't set, or set to 0 for automatic
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calculation using cluster size and partition size.
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""")
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args = parser.parse_args()
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if args.fat_type == 0:
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args.fat_type = None
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args.partition_size = int(str(args.partition_size), 0)
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if not os.path.isdir(args.input_directory):
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raise NotADirectoryError(f'The target directory `{args.input_directory}` does not exist!')
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return args
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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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DATE_ENTRY = BitStruct(
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'year' / BitsInteger(7),
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'month' / BitsInteger(4),
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'day' / BitsInteger(5))
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TIME_ENTRY = BitStruct(
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'hour' / BitsInteger(5),
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'minute' / BitsInteger(6),
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'second' / BitsInteger(5),
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)
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def build_date_entry(year: int, mon: int, mday: int) -> int:
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"""
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:param year: denotes year starting from 1980 (0 ~ 1980, 1 ~ 1981, etc), valid values are 1980 + 0..127 inclusive
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thus theoretically 1980 - 2107
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:param mon: denotes number of month of year in common order (1 ~ January, 2 ~ February, etc.),
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valid values: 1..12 inclusive
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:param mday: denotes number of day in month, valid values are 1..31 inclusive
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:returns: 16 bit integer number (7 bits for year, 4 bits for month and 5 bits for day of the month)
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"""
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assert year in range(FATFS_INCEPTION_YEAR, FATFS_INCEPTION_YEAR + FATFS_MAX_YEARS)
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assert mon in range(1, FATFS_MAX_MONTHS + 1)
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assert mday in range(1, FATFS_MAX_DAYS + 1)
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return int.from_bytes(DATE_ENTRY.build(dict(year=year - FATFS_INCEPTION_YEAR, month=mon, day=mday)), 'big')
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def build_time_entry(hour: int, minute: int, sec: int) -> int:
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"""
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:param hour: denotes number of hour, valid values are 0..23 inclusive
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:param minute: denotes minutes, valid range 0..59 inclusive
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:param sec: denotes seconds with granularity 2 seconds (e.g. 1 ~ 2, 29 ~ 58), valid range 0..29 inclusive
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:returns: 16 bit integer number (5 bits for hour, 6 bits for minute and 5 bits for second)
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"""
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assert hour in range(FATFS_MAX_HOURS)
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assert minute in range(FATFS_MAX_MINUTES)
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assert sec in range(FATFS_MAX_SECONDS)
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return int.from_bytes(TIME_ENTRY.build(
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dict(hour=hour, minute=minute, second=sec // FATFS_SECONDS_GRANULARITY)),
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byteorder='big'
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)
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class FATDefaults:
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# FATFS defaults
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SIZE: int = 1024 * 1024
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RESERVED_SECTORS_COUNT: int = 1
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FAT_TABLES_COUNT: int = 1
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SECTORS_PER_CLUSTER: int = 1
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SECTOR_SIZE: int = 0x1000
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HIDDEN_SECTORS: int = 0
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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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ROOT_ENTRIES_COUNT: int = 512 # number of entries in the root directory, recommended 512
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MEDIA_TYPE: int = 0xf8
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SIGNATURE_WORD: bytes = b'\x55\xAA'
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# wear levelling defaults
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VERSION: int = 2
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TEMP_BUFFER_SIZE: int = 32
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UPDATE_RATE: int = 16
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WR_SIZE: int = 16
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WL_SECTOR_SIZE: int = 4096
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