UpdateContainer: pass suffix instead of DecoderPlugin

src/UpdateContainer.cxx

@@ -26,6 +26,7 @@
 #include "Directory.hxx"
 #include "Song.hxx"
 #include "DecoderPlugin.hxx"
+#include "DecoderList.hxx"
 #include "Mapper.hxx"
 #include "fs/AllocatedPath.hxx"
 #include "tag/TagHandler.hxx"
@@ -64,14 +65,25 @@ make_directory_if_modified(Directory &parent, const char *name,
 	return directory;
 }
 
+static bool
+SupportsContainerSuffix(const DecoderPlugin &plugin, const char *suffix)
+{
+	return plugin.container_scan != nullptr &&
+		plugin.SupportsSuffix(suffix);
+}
+
 bool
 update_container_file(Directory &directory,
 		      const char *name,
 		      const struct stat *st,
-		      const DecoderPlugin &plugin)
+		      const char *suffix)
 {
-	if (plugin.container_scan == nullptr)
+	const DecoderPlugin *_plugin = decoder_plugins_find([suffix](const DecoderPlugin &plugin){
+			return SupportsContainerSuffix(plugin, suffix);
+		});
+	if (_plugin == nullptr)
 		return false;
+	const DecoderPlugin &plugin = *_plugin;
 
 	db_lock();
 	Directory *contdir = make_directory_if_modified(directory, name, st);

src/UpdateContainer.hxx

@@ -31,6 +31,6 @@ bool
 update_container_file(Directory &directory,
 		      const char *name,
 		      const struct stat *st,
-		      const DecoderPlugin &plugin);
+		      const char *suffix);
 
 #endif

src/UpdateSong.cxx

@@ -35,7 +35,7 @@
 static void
 update_song_file2(Directory &directory,
 		  const char *name, const struct stat *st,
-		  const DecoderPlugin &plugin)
+		  const char *suffix)
 {
 	db_lock();
 	Song *song = directory.FindSong(name);
@@ -56,7 +56,7 @@ update_song_file2(Directory &directory,
 
 	if (!(song != nullptr && st->st_mtime == song->mtime &&
 	      !walk_discard) &&
-	    update_container_file(directory, name, st, plugin)) {
+	    update_container_file(directory, name, st, suffix)) {
 		if (song != nullptr) {
 			db_lock();
 			delete_song(directory, song);
@@ -110,6 +110,6 @@ update_song_file(Directory &directory,
 	if (plugin == nullptr)
 		return false;
 
-	update_song_file2(directory, name, st, *plugin);
+	update_song_file2(directory, name, st, suffix);
 	return true;
 }