1 files changed, 41 insertions, 0 deletions
diff --git a/vendor/gix-index/src/file/verify.rs b/vendor/gix-index/src/file/verify.rs
new file mode 100644
index 000000000..6743b37a7
--- /dev/null
+++ b/vendor/gix-index/src/file/verify.rs
@@ -0,0 +1,41 @@
+use std::sync::atomic::AtomicBool;
+
+use crate::File;
+
+mod error {
+    /// The error returned by [File::verify_integrity()][super::File::verify_integrity()].
+    #[derive(Debug, thiserror::Error)]
+    #[allow(missing_docs)]
+    pub enum Error {
+        #[error("Could not read index file to generate hash")]
+        Io(#[from] std::io::Error),
+        #[error("Index checksum should have been {expected}, but was {actual}")]
+        ChecksumMismatch {
+            actual: gix_hash::ObjectId,
+            expected: gix_hash::ObjectId,
+        },
+        #[error("Checksum of in-memory index wasn't computed yet")]
+        NoChecksum,
+    }
+}
+pub use error::Error;
+
+impl File {
+    /// Verify the integrity of the index to assure its consistency.
+    pub fn verify_integrity(&self) -> Result<(), Error> {
+        let checksum = self.checksum.ok_or(Error::NoChecksum)?;
+        let num_bytes_to_hash = self.path.metadata()?.len() - checksum.as_bytes().len() as u64;
+        let should_interrupt = AtomicBool::new(false);
+        let actual = gix_features::hash::bytes_of_file(
+            &self.path,
+            num_bytes_to_hash as usize,
+            checksum.kind(),
+            &mut gix_features::progress::Discard,
+            &should_interrupt,
+        )?;
+        (actual == checksum).then_some(()).ok_or(Error::ChecksumMismatch {
+            actual,
+            expected: checksum,
+        })
+    }
+}