Fix reading LCN positions of data runs of non-resident attributes.

The LCN offset of a data run is relative to the previous one.
We need to read it as a _signed_ variable-length integer and turn it into an absolute LCN position.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/error.rs b/src/error.rs
index 25dd00a..2d34537 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -24,6 +24,9 @@ pub enum NtfsError {
         expected: u8,
         actual: u8,
     },
+    /// An invalid LCN position {lcn_position} was calculated from the NTFS data run header at
+    /// byte position {position:#010x} (and previous data runs)
+    InvalidLcnPositionInDataRunHeader { position: u64, lcn_position: i64 },
     /// The requested NTFS file {n} is invalid
     InvalidNtfsFile { n: u64 },
     /// The NTFS file at byte position {position:#010x} should have signature {expected:?}, but it has signature {actual:?}