factor out private gix_object::object_hasher helper

Author: emilazy

gix-object/src/lib.rs

@@ -398,15 +398,17 @@ pub mod decode {
     }
 }
 
+fn object_hasher(hash_kind: gix_hash::Kind, object_kind: Kind, object_size: u64) -> gix_features::hash::Hasher {
+    let mut hasher = gix_features::hash::hasher(hash_kind);
+    hasher.update(&encode::loose_header(object_kind, object_size));
+    hasher
+}
+
 /// A function to compute a hash of kind `hash_kind` for an object of `object_kind` and its `data`.
 #[doc(alias = "hash_object", alias = "git2")]
 pub fn compute_hash(hash_kind: gix_hash::Kind, object_kind: Kind, data: &[u8]) -> gix_hash::ObjectId {
-    let header = encode::loose_header(object_kind, data.len() as u64);
-
-    let mut hasher = gix_features::hash::hasher(hash_kind);
-    hasher.update(&header);
+    let mut hasher = object_hasher(hash_kind, object_kind, data.len() as u64);
     hasher.update(data);
-
     hasher.digest().into()
 }
 
@@ -423,9 +425,6 @@ pub fn compute_stream_hash(
     progress: &mut dyn gix_features::progress::Progress,
     should_interrupt: &std::sync::atomic::AtomicBool,
 ) -> std::io::Result<gix_hash::ObjectId> {
-    let header = encode::loose_header(object_kind, stream_len);
-    let mut hasher = gix_features::hash::hasher(hash_kind);
-
-    hasher.update(&header);
+    let hasher = object_hasher(hash_kind, object_kind, stream_len);
     gix_features::hash::bytes_with_hasher(stream, stream_len, hasher, progress, should_interrupt)
 }