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Extended File
ksherlock edited this page Apr 23, 2015
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Extended files are used for storing files which contain a resource fork. They are not supported by ProDOS 8.
| storage_type | $05 |
|---|
The key_pointer is a block containing 2 mini entries; one for the data fork (at offset $0), one for the resource fork (at offset $100).
| Name | Offset | Size |
|---|---|---|
| storage_type | $00 | 1 byte |
| key_block | $01 | 2 bytes |
| blocks_used | $03 | 2 bytes |
| eof | $05 | 2 bytes |
Unlike the File Entry storage_type field, the high nibble is 0. The only valid values are $01, $02, or $03.
As of System 6.0, Macintosh finder information can be stored after the data fork mini entry (starting offset of $08).
| Name | Offset | Size | Value |
|---|---|---|---|
| size_1 | $00 | 1 byte | 18 |
| type_1 | $01 | 1 byte | 1 |
| FInfo | $02 | 16 bytes | ... |
| size_2 | $12 | 1 byte | 18 |
| type_2 | $13 | 1 byte | 2 |
| xFInfo | $14 | 16 bytes | ... |
| end_mark | $24 | 1 byte | 0 |
One or both of FInfo and xFInfo may be missing, in which case they should be considered 0-filled.
- ProDOS Technote #25
- Programmer's Reference for 6.0 (pages 324, 325)