Add scan percentages (fixes #1030)

lib/scanner/walk_test.go

@@ -149,8 +149,9 @@ func TestVerify(t *testing.T) {
 	// data should be an even multiple of blocksize long
 	data := []byte("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut e")
 	buf := bytes.NewBuffer(data)
+	var progress uint64
 
-	blocks, err := Blocks(buf, blocksize, 0)
+	blocks, err := Blocks(buf, blocksize, 0, &progress)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -158,6 +159,10 @@ func TestVerify(t *testing.T) {
 		t.Fatalf("Incorrect number of blocks %d != %d", len(blocks), exp)
 	}
 
+	if uint64(len(data)) != progress {
+		t.Fatalf("Incorrect counter value %d  != %d", len(data), progress)
+	}
+
 	buf = bytes.NewBuffer(data)
 	err = Verify(buf, blocksize, blocks)
 	t.Log(err)