tag_file: convert to C++

src/TagFile.cxx

@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "TagFile.hxx"
+
+extern "C" {
+#include "uri.h"
+#include "decoder_list.h"
+}
+
+#include "decoder_plugin.h"
+#include "input_stream.h"
+
+#include <assert.h>
+#include <unistd.h> /* for SEEK_SET */
+
+bool
+tag_file_scan(const char *path_fs,
+	      const struct tag_handler *handler, void *handler_ctx)
+{
+	assert(path_fs != NULL);
+	assert(handler != NULL);
+
+	/* check if there's a suffix and a plugin */
+
+	const char *suffix = uri_get_suffix(path_fs);
+	if (suffix == NULL)
+		return false;
+
+	const struct decoder_plugin *plugin =
+		decoder_plugin_from_suffix(suffix, NULL);
+	if (plugin == NULL)
+		return false;
+
+	struct input_stream *is = NULL;
+	GMutex *mutex = NULL;
+	GCond *cond = NULL;
+
+	do {
+		/* load file tag */
+		if (decoder_plugin_scan_file(plugin, path_fs,
+					     handler, handler_ctx))
+			break;
+
+		/* fall back to stream tag */
+		if (plugin->scan_stream != NULL) {
+			/* open the input_stream (if not already
+			   open) */
+			if (is == NULL) {
+				mutex = g_mutex_new();
+				cond = g_cond_new();
+				is = input_stream_open(path_fs, mutex, cond,
+						       NULL);
+			}
+
+			/* now try the stream_tag() method */
+			if (is != NULL) {
+				if (decoder_plugin_scan_stream(plugin, is,
+							       handler,
+							       handler_ctx))
+					break;
+
+				input_stream_lock_seek(is, 0, SEEK_SET, NULL);
+			}
+		}
+
+		plugin = decoder_plugin_from_suffix(suffix, plugin);
+	} while (plugin != NULL);
+
+	if (is != NULL) {
+		input_stream_close(is);
+		g_cond_free(cond);
+		g_mutex_free(mutex);
+	}
+
+	return plugin != NULL;
+}