From 8b5d796989cf0798ee61003159ba8b332675bdf2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Erik=20Pedersen?=
 <bjorn.erik.pedersen@gmail.com>
Date: Tue, 30 Jul 2024 12:42:17 +0200
Subject: [PATCH] resources: Add BenchmarkHashImage

---
 resources/resource.go      |  6 +++++-
 resources/resource_test.go | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 resources/resource_test.go

diff --git a/resources/resource.go b/resources/resource.go
index 8fade941a..19270307e 100644
--- a/resources/resource.go
+++ b/resources/resource.go
@@ -644,7 +644,7 @@ func (r *resourceHash) init(l hugio.ReadSeekCloserProvider) error {
 			return
 		}
 		defer f.Close()
-		hash, size, err = helpers.MD5FromReaderFast(f)
+		hash, size, err = hashImage(f)
 		if err != nil {
 			initErr = fmt.Errorf("failed to calculate hash: %w", err)
 			return
@@ -655,3 +655,7 @@ func (r *resourceHash) init(l hugio.ReadSeekCloserProvider) error {
 
 	return initErr
 }
+
+func hashImage(r io.ReadSeeker) (string, int64, error) {
+	return helpers.MD5FromReaderFast(r)
+}
diff --git a/resources/resource_test.go b/resources/resource_test.go
new file mode 100644
index 000000000..ccce8eff7
--- /dev/null
+++ b/resources/resource_test.go
@@ -0,0 +1,36 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package resources
+
+import (
+	"os"
+	"testing"
+)
+
+func BenchmarkHashImage(b *testing.B) {
+	f, err := os.Open("testdata/sunset.jpg")
+	if err != nil {
+		b.Fatal(err)
+	}
+	defer f.Close()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_, _, err := hashImage(f)
+		if err != nil {
+			b.Fatal(err)
+		}
+		f.Seek(0, 0)
+	}
+}