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fatfs: enable long file names for fatfsparse.py

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This commit is contained in:
Martin Gaňo
2022-05-23 15:10:46 +02:00
parent 815935b01e
commit 0f160c8f11
10 changed files with 154 additions and 82 deletions
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6
components/fatfs/fatfs_utils/long_filename_utils.py
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@@ -44,14 +44,15 @@ def split_name_to_lfn_entry_blocks(name: str) -> List[bytes]:
characters are set to 0xFFFF.
E.g.:
'GFILENAMA.TXT' -> [b'G\x00F\x00I\x00L\x00E\x00', b'N\x00A\x00M\x00A\x00.\x00T\x00', b'X\x00T\x00'];
'T' -> [b'T\x00\x00\x00\xff\xff\xff\xff\xff\xff', b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff', b'\xff\xff\xff\xff']
'T' -> [b'T\x00\x00\x00\xff\xff\xff\xff\xff\xff', b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff',
b'\xff\xff\xff\xff']
Notice that since every character is coded using 2 bytes be must add 0x00 to ASCII symbols ('G' -> 'G\x00', etc.),
since character 'T' ends in the first block, we must add '\x00\x00' after 'T\x00'.
"""
max_entry_size: int = Entry.LDIR_Name1_SIZE + Entry.LDIR_Name2_SIZE + Entry.LDIR_Name2_SIZE
assert len(name) <= max_entry_size
return [
blocks_: List[bytes] = [
convert_to_utf16_and_pad(content=name[:Entry.LDIR_Name1_SIZE],
expected_size=Entry.LDIR_Name1_SIZE),
convert_to_utf16_and_pad(content=name[Entry.LDIR_Name1_SIZE:Entry.LDIR_Name1_SIZE + Entry.LDIR_Name2_SIZE],
@@ -59,6 +60,7 @@ def split_name_to_lfn_entry_blocks(name: str) -> List[bytes]:
convert_to_utf16_and_pad(content=name[Entry.LDIR_Name1_SIZE + Entry.LDIR_Name2_SIZE:],
expected_size=Entry.LDIR_Name3_SIZE)
]
return blocks_
def build_lfn_unique_entry_name_order(entities: list, lfn_entry_name: str) -> int: