TagArchive: add overload with ArchiveFile&

src/TagArchive.cxx

@@ -23,6 +23,7 @@
 #include "tag/Generic.hxx"
 #include "tag/TagHandler.hxx"
 #include "tag/TagBuilder.hxx"
+#include "archive/ArchiveFile.hxx"
 #include "fs/Path.hxx"
 #include "util/Error.hxx"
 #include "input/InputStream.hxx"
@@ -57,3 +58,15 @@ tag_archive_scan(Path path, TagBuilder &builder)
 						 IgnoreError()));
 	return is && tag_stream_scan(*is, builder);
 }
+
+bool
+tag_archive_scan(ArchiveFile &archive, const char *path_utf8,
+		 TagBuilder &builder)
+{
+	Mutex mutex;
+	Cond cond;
+
+	InputStreamPtr is(archive.OpenStream(path_utf8, mutex, cond,
+					     IgnoreError()));
+	return is && tag_stream_scan(*is, builder);
+}

src/TagArchive.hxx

@@ -22,6 +22,7 @@
 
 #include "check.h"
 
+class ArchiveFile;
 class Path;
 struct TagHandler;
 class TagBuilder;
@@ -48,4 +49,16 @@ tag_archive_scan(Path path, const TagHandler &handler, void *handler_ctx);
 bool
 tag_archive_scan(Path path, TagBuilder &builder);
 
+/**
+ * Scan the tags of a song file inside an archive.  Invokes matching
+ * decoder plugins, and falls back to generic scanners (APE and ID3)
+ * if no tags were found (but the file was recognized).
+ *
+ * @return true if the file was recognized (even if no metadata was
+ * found)
+ */
+bool
+tag_archive_scan(ArchiveFile &archive, const char *path_utf8,
+		 TagBuilder &builder);
+
 #endif