dcb/dcb-io/src/drv/dir/entry.md

Directory entry

Layout

Each directory entry has the following layout:

Offset	Size	Type	Name
0x0	0x1	Kind	Entry kind, 0x0 for none, 0x1 for files and 0x80 for directories
0x1	0x3	[u8; 3]	(Files only) File extension
0x4	0x4	u32	Entry sector position
0x8	0x4	u32	(Files only) File size in bytes
0xc	0x4	u32	Entry date (seconds since epoch)
0x10	0x10	[u8; 0x10]	Entry name

Limitations

The max size for a file is u32::MAX bytes, but the filesystem itself can hold 2^43 bytes in total, as each directory and file position is done by sector.