From 721308cb8e9a948c2a87134ff6caf286f4a75da7 Mon Sep 17 00:00:00 2001
From: MattJackson <1085847+MattJackson@users.noreply.github.com>
Date: Tue, 7 Apr 2026 11:44:23 -0700
Subject: [PATCH] Fix UDF file data reads: use partition_start not
 metadata_start
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File data extents are in the physical partition (partition_start + lba),
not the metadata partition. ICBs (directory/file entries) are in metadata,
but the data they point to is in physical. This one-line fix makes all
MPLS playlists readable — previously only 1/18 had correct MPLS magic.

Tested on Civil War UHD: 18 playlists, main movie at 00400.mpls (57min, 6 clips).
---
 src/udf.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/udf.rs b/src/udf.rs
index 1edb33b..9b91145 100644
--- a/src/udf.rs
+++ b/src/udf.rs
@@ -87,9 +87,11 @@ impl UdfFs {
         let (data_lba, data_len) = self.read_icb_extent(session, entry.meta_lba)?;
 
         // Read file data sector by sector
+        // File DATA is in the physical partition (partition_start + lba),
+        // NOT the metadata partition. ICBs are in metadata, data is in physical.
         let sector_count = ((data_len as u64 + 2047) / 2048) as u32;
         let mut data = vec![0u8; (sector_count as usize) * 2048];
-        let abs_start = self.meta_to_abs(data_lba);
+        let abs_start = self.partition_start + data_lba;
 
         for i in 0..sector_count {
             let offset = (i as usize) * 2048;