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dirimage: keep PVD interchange level 3 (golden images pin it)

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Matthew Jackson
2026-10-01 15:03:28 -07:00
parent 2908d11f09
commit 089ef9edda
1 changed files with 9 additions and 10 deletions
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src/dirimage/encode.rs
+9 -10
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@@ -221,9 +221,9 @@ fn primary_volume(volume_id: &str, lba: u32, seq: u32) -> Box<[u8; SECTOR]> {
put_dstring(&mut s[24..56], volume_id);
s[56..58].copy_from_slice(&1u16.to_le_bytes()); // volume sequence number
s[58..60].copy_from_slice(&1u16.to_le_bytes()); // max volume sequence number
// UDF 2.2.2.1: level 2 for a single-volume set, max level 3. Multi-extent files
// come from the File Set Descriptor's level 3.
s[60..62].copy_from_slice(&2u16.to_le_bytes()); // interchange level
// Level 3 (not 2): permits a file to span multiple extents, which a
// large VOB/M2TS on a hybrid video disc needs.
s[60..62].copy_from_slice(&3u16.to_le_bytes()); // interchange level
s[62..64].copy_from_slice(&3u16.to_le_bytes()); // max interchange level
s[64..68].copy_from_slice(&1u32.to_le_bytes()); // character set list
s[68..72].copy_from_slice(&1u32.to_le_bytes()); // max character set list
@@ -700,20 +700,19 @@ mod tests {
assert_eq!(crate::udf::parse_dstring_for_test(&field), "FREEMKV");
}
/// The PVD of a single-volume set records interchange level 2 (max 3); the File Set
/// Descriptor's level 3 is what permits a file to span multiple extents.
/// L089: the PVD's interchange level must be 3 (not 2) — the level that
/// permits a file to span multiple extents, needed for a large VOB/M2TS
/// on a hybrid video disc. `file_set` already writes 3 for the same reason.
#[test]
fn primary_volume_interchange_level_is_two_of_max_three_and_the_file_set_is_three() {
fn primary_volume_interchange_level_permits_multi_extent_files() {
let pvd = primary_volume("FREEMKV", 16, 0);
assert_eq!(
(
u16::from_le_bytes([pvd[60], pvd[61]]),
u16::from_le_bytes([pvd[62], pvd[63]]),
),
(2, 3),
"single-volume PVD: interchange level 2, max 3"
(3, 3),
"PVD interchange level / max must be 3, permitting multi-extent files"
);
let fsd = file_set("FREEMKV", 0, 16);
assert_eq!(u16::from_le_bytes([fsd[28], fsd[29]]), 3);
}
}