song_update: convert to C++

src/SongUpdate.cxx

@@ -0,0 +1,210 @@
+/*
+ * 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" /* must be first for large file support */
+
+extern "C" {
+#include "song.h"
+#include "uri.h"
+}
+
+#include "directory.h"
+
+extern "C" {
+#include "mapper.h"
+#include "decoder_list.h"
+#include "decoder_plugin.h"
+#include "tag_ape.h"
+#include "tag_id3.h"
+#include "tag.h"
+#include "tag_handler.h"
+#include "input_stream.h"
+}
+
+#include <glib.h>
+
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+
+struct song *
+song_file_load(const char *path, struct directory *parent)
+{
+	struct song *song;
+	bool ret;
+
+	assert((parent == NULL) == g_path_is_absolute(path));
+	assert(!uri_has_scheme(path));
+	assert(strchr(path, '\n') == NULL);
+
+	song = song_file_new(path, parent);
+
+	//in archive ?
+	if (parent != NULL && parent->device == DEVICE_INARCHIVE) {
+		ret = song_file_update_inarchive(song);
+	} else {
+		ret = song_file_update(song);
+	}
+	if (!ret) {
+		song_free(song);
+		return NULL;
+	}
+
+	return song;
+}
+
+/**
+ * Attempts to load APE or ID3 tags from the specified file.
+ */
+static bool
+tag_scan_fallback(const char *path,
+		  const struct tag_handler *handler, void *handler_ctx)
+{
+	return tag_ape_scan2(path, handler, handler_ctx) ||
+		tag_id3_scan(path, handler, handler_ctx);
+}
+
+bool
+song_file_update(struct song *song)
+{
+	const char *suffix;
+	char *path_fs;
+	const struct decoder_plugin *plugin;
+	struct stat st;
+	struct input_stream *is = NULL;
+
+	assert(song_is_file(song));
+
+	/* check if there's a suffix and a plugin */
+
+	suffix = uri_get_suffix(song->uri);
+	if (suffix == NULL)
+		return false;
+
+	plugin = decoder_plugin_from_suffix(suffix, NULL);
+	if (plugin == NULL)
+		return false;
+
+	path_fs = map_song_fs(song);
+	if (path_fs == NULL)
+		return false;
+
+	if (song->tag != NULL) {
+		tag_free(song->tag);
+		song->tag = NULL;
+	}
+
+	if (stat(path_fs, &st) < 0 || !S_ISREG(st.st_mode)) {
+		g_free(path_fs);
+		return false;
+	}
+
+	song->mtime = st.st_mtime;
+
+	GMutex *mutex = NULL;
+	GCond *cond;
+#if !GCC_CHECK_VERSION(4, 2)
+	/* work around "may be used uninitialized in this function"
+	   false positive */
+	cond = NULL;
+#endif
+
+	do {
+		/* load file tag */
+		song->tag = tag_new();
+		if (decoder_plugin_scan_file(plugin, path_fs,
+					     &full_tag_handler, song->tag))
+			break;
+
+		tag_free(song->tag);
+		song->tag = NULL;
+
+		/* 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) {
+				song->tag = tag_new();
+				if (decoder_plugin_scan_stream(plugin, is,
+							       &full_tag_handler,
+							       song->tag))
+					break;
+
+				tag_free(song->tag);
+				song->tag = NULL;
+
+				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);
+
+	if (mutex != NULL) {
+		g_cond_free(cond);
+		g_mutex_free(mutex);
+	}
+
+	if (song->tag != NULL && tag_is_empty(song->tag))
+		tag_scan_fallback(path_fs, &full_tag_handler, song->tag);
+
+	g_free(path_fs);
+	return song->tag != NULL;
+}
+
+bool
+song_file_update_inarchive(struct song *song)
+{
+	const char *suffix;
+	const struct decoder_plugin *plugin;
+
+	assert(song_is_file(song));
+
+	/* check if there's a suffix and a plugin */
+
+	suffix = uri_get_suffix(song->uri);
+	if (suffix == NULL)
+		return false;
+
+	plugin = decoder_plugin_from_suffix(suffix, nullptr);
+	if (plugin == NULL)
+		return false;
+
+	if (song->tag != NULL)
+		tag_free(song->tag);
+
+	//accept every file that has music suffix
+	//because we don't support tag reading through
+	//input streams
+	song->tag = tag_new();
+
+	return true;
+}