DetachedSong: move code from Update() to LoadFile()

Avoid duplicate AllocatedPath::FromUTF8() invocations in two callers.

src/DetachedSong.hxx

@@ -32,6 +32,7 @@
 
 struct LightSong;
 class Storage;
+class Path;
 
 class DetachedSong {
 	friend DetachedSong DatabaseDetachSong(const Storage &db,
@@ -220,6 +221,11 @@ public:
 	 * @return true on success
 	 */
 	bool Update();
+
+	/**
+	 * Load #tag and #mtime from a local file.
+	 */
+	bool LoadFile(Path path);
 };
 
 #endif

src/SongLoader.cxx

@@ -54,17 +54,15 @@ SongLoader::LoadFile(const char *path_utf8, Error &error) const
 	}
 #endif
 
-	if (client != nullptr) {
-		const auto path_fs = AllocatedPath::FromUTF8(path_utf8, error);
-		if (path_fs.IsNull())
-			return nullptr;
+	const auto path_fs = AllocatedPath::FromUTF8(path_utf8, error);
+	if (path_fs.IsNull())
+		return nullptr;
 
-		if (!client->AllowFile(path_fs, error))
-			return nullptr;
-	}
+	if (client != nullptr && !client->AllowFile(path_fs, error))
+		return nullptr;
 
 	DetachedSong *song = new DetachedSong(path_utf8);
-	if (!song->Update()) {
+	if (!song->LoadFile(path_fs)) {
 		error.Set(playlist_domain, int(PlaylistResult::NO_SUCH_SONG),
 			  "No such file");
 		delete song;

src/SongUpdate.cxx

@@ -153,6 +153,26 @@ Song::UpdateFileInArchive(const Storage &storage)
 
 #endif
 
+bool
+DetachedSong::LoadFile(Path path)
+{
+	FileInfo fi;
+	if (!GetFileInfo(path, fi) || !fi.IsRegular())
+		return false;
+
+	TagBuilder tag_builder;
+	if (!tag_file_scan(path, full_tag_handler, &tag_builder))
+		return false;
+
+	if (tag_builder.IsEmpty())
+		tag_scan_fallback(path, &full_tag_handler,
+				  &tag_builder);
+
+	mtime = fi.GetModificationTime();
+	tag_builder.Commit(tag);
+	return true;
+}
+
 bool
 DetachedSong::Update()
 {
@@ -160,21 +180,7 @@ DetachedSong::Update()
 		const AllocatedPath path_fs =
 			AllocatedPath::FromUTF8(GetRealURI());
 
-		FileInfo fi;
-		if (!GetFileInfo(path_fs, fi) || !fi.IsRegular())
-			return false;
-
-		TagBuilder tag_builder;
-		if (!tag_file_scan(path_fs, full_tag_handler, &tag_builder))
-			return false;
-
-		if (tag_builder.IsEmpty())
-			tag_scan_fallback(path_fs, &full_tag_handler,
-					  &tag_builder);
-
-		mtime = fi.GetModificationTime();
-		tag_builder.Commit(tag);
-		return true;
+		return LoadFile(path_fs);
 	} else if (IsRemote()) {
 		TagBuilder tag_builder;
 		if (!tag_stream_scan(uri.c_str(), full_tag_handler,

src/command/OtherCommands.cxx

@@ -176,7 +176,7 @@ handle_lsinfo(Client &client, Request args, Response &r)
 			return print_error(r, error);
 
 		DetachedSong song(path_utf8);
-		if (!song.Update()) {
+		if (!song.LoadFile(path_fs)) {
 			r.Error(ACK_ERROR_NO_EXIST, "No such file");
 			return CommandResult::ERROR;
 		}

test/test_translate_song.cxx

@@ -121,9 +121,9 @@ DatabaseDetachSong(gcc_unused const Database &db,
 }
 
 bool
-DetachedSong::Update()
+DetachedSong::LoadFile(Path path)
 {
-	if (strcmp(GetURI(), uri1) == 0) {
+	if (path.ToUTF8() == uri1) {
 		SetTag(MakeTag1a());
 		return true;
 	}