playlist: added CUE playlist plugin

This plugin is the groundwork for MPD's future generic CUE sheet
support.  That's not complete yet, e.g. there is no way for a playlist
plugin to address an arbitrary position within a music file.

2 files changed, 162 insertions, 0 deletions

diff --git a/src/playlist/cue_playlist_plugin.c b/src/playlist/cue_playlist_plugin.c
new file mode 100644
index 00000000..8db0018c
--- /dev/null
+++ b/src/playlist/cue_playlist_plugin.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2003-2009 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 "playlist/cue_playlist_plugin.h"
+#include "playlist_plugin.h"
+#include "tag.h"
+#include "song.h"
+#include "cue/cue_tag.h"
+
+#include <glib.h>
+#include <libcue/libcue.h>
+#include <assert.h>
+#include <string.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "cue"
+
+struct cue_playlist {
+	struct playlist_provider base;
+
+	struct Cd *cd;
+
+	unsigned next;
+
+	char *path;
+};
+
+static struct playlist_provider *
+cue_playlist_open_uri(const char *uri)
+{
+	struct cue_playlist *playlist;
+	FILE *file;
+	struct Cd *cd;
+
+	file = fopen(uri, "rt");
+	if (file == NULL)
+		return NULL;
+
+	cd = cue_parse_file(file);
+	fclose(file);
+	if (cd == NULL)
+		return NULL;
+
+	playlist = g_new(struct cue_playlist, 1);
+	playlist_provider_init(&playlist->base, &cue_playlist_plugin);
+	playlist->cd = cd;
+	playlist->next = 1;
+	playlist->path = g_path_get_dirname(uri);
+
+	return &playlist->base;
+}
+
+static void
+cue_playlist_close(struct playlist_provider *_playlist)
+{
+	struct cue_playlist *playlist = (struct cue_playlist *)_playlist;
+
+	g_free(playlist->path);
+	cd_delete(playlist->cd);
+	g_free(playlist);
+}
+
+static struct song *
+cue_playlist_read(struct playlist_provider *_playlist)
+{
+	struct cue_playlist *playlist = (struct cue_playlist *)_playlist;
+	struct Track *track;
+	struct tag *tag;
+	const char *filename;
+	char *uri;
+	struct song *song;
+
+	track = cd_get_track(playlist->cd, playlist->next);
+	if (track == NULL)
+		return NULL;
+
+	tag = cue_tag(playlist->cd, playlist->next);
+	if (tag == NULL)
+		return NULL;
+
+	++playlist->next;
+
+	filename = track_get_filename(track);
+	if (*filename == 0 || filename[0] == '.' ||
+	    strchr(filename, '/') != NULL) {
+		/* unsafe characters found, bail out */
+		tag_free(tag);
+		return NULL;
+	}
+
+	uri = g_strconcat(playlist->path, "/", filename, NULL);
+
+	song = song_file_new(uri, NULL);
+	song->tag = tag;
+
+	g_free(uri);
+
+	return song;
+}
+
+static const char *const cue_playlist_suffixes[] = {
+	"cue",
+	NULL
+};
+
+static const char *const cue_playlist_mime_types[] = {
+	"application/x-cue",
+	NULL
+};
+
+const struct playlist_plugin cue_playlist_plugin = {
+	.name = "cue",
+
+	.open_uri = cue_playlist_open_uri,
+	.close = cue_playlist_close,
+	.read = cue_playlist_read,
+
+	.suffixes = cue_playlist_suffixes,
+	.mime_types = cue_playlist_mime_types,
+};
diff --git a/src/playlist/cue_playlist_plugin.h b/src/playlist/cue_playlist_plugin.h
new file mode 100644
index 00000000..2b531938
--- /dev/null
+++ b/src/playlist/cue_playlist_plugin.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2003-2009 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.
+ */
+
+#ifndef MPD_PLAYLIST_CUE_PLAYLIST_PLUGIN_H
+#define MPD_PLAYLIST_CUE_PLAYLIST_PLUGIN_H
+
+extern const struct playlist_plugin cue_playlist_plugin;
+
+#endif