WonderWitch .fx files
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FreyaOS uses XMODEM transfers to send and receive files through the serial port. These transfers do not include any file metadata by default - such as the file's name, size, permissions or creation date. As such, .fx files are used - binary files with a special 128-byte header[1].
Format
| Offset | Length | Contents |
|---|---|---|
| $00 | 4 | Magic string: #!ws
|
| $04 | 60 | Padding; typically 0xFF. |
| $40 | 16 | File name; zero-terminated Shift-JIS string. |
| $50 | 24 | User-friendly file name; zero-terminated Shift-JIS string.
FreyaOS displays the first 12 characters in its file selector. |
| $68 | 4 | ? |
| $6C | 4 | Total file size, in bytes, excluding the header. |
| $70 | 2 | XMODEM chunk count - above file size divided by 128, then rounded up. |
| $72 | 2 | File mode |
| $74 | 4 | Modification time - seconds since January 1st, 2000. |
| $78 | 4 | ? |
| $7C | 4 | Offset to resource data, bytes excluding header; -1 if not present. |
File mode
15 bit 8 7 bit 0
---- ---- ---- ----
???? ???? ??i? ?rwx
| |||
| ||+- Execute
| |+-- Write
| +--- Read
+------- Intermediate library
- ↑ XMODEM transfers are performed in 128-byte blocks; this allows fetching the file's metadata as the first block
