1 files changed, 26 insertions, 0 deletions
diff --git a/object/fetch/exact_reader.go b/object/fetch/exact_reader.go
new file mode 100644
index 00000000..54cf246c
--- /dev/null
+++ b/object/fetch/exact_reader.go
@@ -0,0 +1,26 @@
+package fetch
+
+import (
+	"fmt"
+	"io"
+
+	objectid "codeberg.org/lindenii/furgit/object/id"
+	objecttype "codeberg.org/lindenii/furgit/object/type"
+)
+
+// exactReader reads one object's content stream and verifies that its header
+// type matches wantType.
+func (r *Fetcher) exactReader(id objectid.ObjectID, wantType objecttype.Type, wantName string) (io.ReadCloser, int64, error) {
+	gotType, size, rc, err := r.store.ReadReaderContent(id)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	if gotType != wantType {
+		_ = rc.Close()
+
+		return nil, 0, fmt.Errorf("object/fetch: expected %s object %s, got %v", wantName, id, gotType)
+	}
+
+	return rc, size, nil
+}