db_save, state_file: convert to C++

src/QueueSave.cxx

@@ -0,0 +1,129 @@
+/*
+ * 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 "QueueSave.hxx"
+#include "song.h"
+#include "SongSave.hxx"
+
+extern "C" {
+#include "queue.h"
+#include "uri.h"
+#include "database.h"
+#include "text_file.h"
+}
+
+#include <stdlib.h>
+
+#define PRIO_LABEL "Prio: "
+
+static void
+queue_save_database_song(FILE *fp, int idx, const struct song *song)
+{
+	char *uri = song_get_uri(song);
+
+	fprintf(fp, "%i:%s\n", idx, uri);
+	g_free(uri);
+}
+
+static void
+queue_save_full_song(FILE *fp, const struct song *song)
+{
+	song_save(fp, song);
+}
+
+static void
+queue_save_song(FILE *fp, int idx, const struct song *song)
+{
+	if (song_in_database(song))
+		queue_save_database_song(fp, idx, song);
+	else
+		queue_save_full_song(fp, song);
+}
+
+void
+queue_save(FILE *fp, const struct queue *queue)
+{
+	for (unsigned i = 0; i < queue_length(queue); i++) {
+		uint8_t prio = queue_get_priority_at_position(queue, i);
+		if (prio != 0)
+			fprintf(fp, PRIO_LABEL "%u\n", prio);
+
+		queue_save_song(fp, i, queue_get(queue, i));
+	}
+}
+
+static struct song *
+get_song(const char *uri)
+{
+	return uri_has_scheme(uri)
+		? song_remote_new(uri)
+		: db_get_song(uri);
+}
+
+void
+queue_load_song(FILE *fp, GString *buffer, const char *line,
+		struct queue *queue)
+{
+	struct song *song;
+
+	if (queue_is_full(queue))
+		return;
+
+	uint8_t priority = 0;
+	if (g_str_has_prefix(line, PRIO_LABEL)) {
+		priority = strtoul(line + sizeof(PRIO_LABEL) - 1, NULL, 10);
+
+		line = read_text_line(fp, buffer);
+		if (line == NULL)
+			return;
+	}
+
+	if (g_str_has_prefix(line, SONG_BEGIN)) {
+		const char *uri = line + sizeof(SONG_BEGIN) - 1;
+		if (!uri_has_scheme(uri) && !g_path_is_absolute(uri))
+			return;
+
+		GError *error = NULL;
+		song = song_load(fp, NULL, uri, buffer, &error);
+		if (song == NULL) {
+			g_warning("%s", error->message);
+			g_error_free(error);
+			return;
+		}
+	} else {
+		char *endptr;
+		long ret = strtol(line, &endptr, 10);
+		if (ret < 0 || *endptr != ':' || endptr[1] == 0) {
+			g_warning("Malformed playlist line in state file");
+			return;
+		}
+
+		line = endptr + 1;
+
+		song = get_song(line);
+		if (song == NULL)
+			return;
+	}
+
+	queue_append(queue, song, priority);
+
+	if (song_in_database(song))
+		db_return_song(song);
+}