playlist/*: convert to C++

src/PlaylistRegistry.cxx

@@ -0,0 +1,352 @@
+/*
+ * 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 "PlaylistRegistry.hxx"
+#include "playlist_plugin.h"
+#include "playlist/extm3u_playlist_plugin.h"
+#include "playlist/m3u_playlist_plugin.h"
+#include "playlist/xspf_playlist_plugin.h"
+#include "playlist/LastFMPlaylistPlugin.hxx"
+#include "playlist/DespotifyPlaylistPlugin.hxx"
+#include "playlist/SoundCloudPlaylistPlugin.hxx"
+#include "playlist/pls_playlist_plugin.h"
+#include "playlist/asx_playlist_plugin.h"
+#include "playlist/rss_playlist_plugin.h"
+#include "playlist/cue_playlist_plugin.h"
+#include "playlist/EmbeddedCuePlaylistPlugin.hxx"
+#include "input_stream.h"
+
+extern "C" {
+#include "uri.h"
+}
+
+#include "string_util.h"
+#include "conf.h"
+#include "mpd_error.h"
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+
+const struct playlist_plugin *const playlist_plugins[] = {
+	&extm3u_playlist_plugin,
+	&m3u_playlist_plugin,
+	&xspf_playlist_plugin,
+	&pls_playlist_plugin,
+	&asx_playlist_plugin,
+	&rss_playlist_plugin,
+#ifdef ENABLE_DESPOTIFY
+	&despotify_playlist_plugin,
+#endif
+#ifdef ENABLE_LASTFM
+	&lastfm_playlist_plugin,
+#endif
+#ifdef ENABLE_SOUNDCLOUD
+	&soundcloud_playlist_plugin,
+#endif
+	&cue_playlist_plugin,
+	&embcue_playlist_plugin,
+	NULL
+};
+
+/** which plugins have been initialized successfully? */
+static bool playlist_plugins_enabled[G_N_ELEMENTS(playlist_plugins)];
+
+#define playlist_plugins_for_each_enabled(plugin) \
+	playlist_plugins_for_each(plugin) \
+		if (playlist_plugins_enabled[playlist_plugin_iterator - playlist_plugins])
+
+/**
+ * Find the "playlist" configuration block for the specified plugin.
+ *
+ * @param plugin_name the name of the playlist plugin
+ * @return the configuration block, or NULL if none was configured
+ */
+static const struct config_param *
+playlist_plugin_config(const char *plugin_name)
+{
+	const struct config_param *param = NULL;
+
+	assert(plugin_name != NULL);
+
+	while ((param = config_get_next_param(CONF_PLAYLIST_PLUGIN, param)) != NULL) {
+		const char *name =
+			config_get_block_string(param, "name", NULL);
+		if (name == NULL)
+			MPD_ERROR("playlist configuration without 'plugin' name in line %d",
+				param->line);
+
+		if (strcmp(name, plugin_name) == 0)
+			return param;
+	}
+
+	return NULL;
+}
+
+void
+playlist_list_global_init(void)
+{
+	for (unsigned i = 0; playlist_plugins[i] != NULL; ++i) {
+		const struct playlist_plugin *plugin = playlist_plugins[i];
+		const struct config_param *param =
+			playlist_plugin_config(plugin->name);
+
+		if (!config_get_block_bool(param, "enabled", true))
+			/* the plugin is disabled in mpd.conf */
+			continue;
+
+		playlist_plugins_enabled[i] =
+			playlist_plugin_init(playlist_plugins[i], param);
+	}
+}
+
+void
+playlist_list_global_finish(void)
+{
+	playlist_plugins_for_each_enabled(plugin)
+		playlist_plugin_finish(plugin);
+}
+
+static struct playlist_provider *
+playlist_list_open_uri_scheme(const char *uri, GMutex *mutex, GCond *cond,
+			      bool *tried)
+{
+	char *scheme;
+	struct playlist_provider *playlist = NULL;
+
+	assert(uri != NULL);
+
+	scheme = g_uri_parse_scheme(uri);
+	if (scheme == NULL)
+		return NULL;
+
+	for (unsigned i = 0; playlist_plugins[i] != NULL; ++i) {
+		const struct playlist_plugin *plugin = playlist_plugins[i];
+
+		assert(!tried[i]);
+
+		if (playlist_plugins_enabled[i] && plugin->open_uri != NULL &&
+		    plugin->schemes != NULL &&
+		    string_array_contains(plugin->schemes, scheme)) {
+			playlist = playlist_plugin_open_uri(plugin, uri,
+							    mutex, cond);
+			if (playlist != NULL)
+				break;
+
+			tried[i] = true;
+		}
+	}
+
+	g_free(scheme);
+	return playlist;
+}
+
+static struct playlist_provider *
+playlist_list_open_uri_suffix(const char *uri, GMutex *mutex, GCond *cond,
+			      const bool *tried)
+{
+	const char *suffix;
+	struct playlist_provider *playlist = NULL;
+
+	assert(uri != NULL);
+
+	suffix = uri_get_suffix(uri);
+	if (suffix == NULL)
+		return NULL;
+
+	for (unsigned i = 0; playlist_plugins[i] != NULL; ++i) {
+		const struct playlist_plugin *plugin = playlist_plugins[i];
+
+		if (playlist_plugins_enabled[i] && !tried[i] &&
+		    plugin->open_uri != NULL && plugin->suffixes != NULL &&
+		    string_array_contains(plugin->suffixes, suffix)) {
+			playlist = playlist_plugin_open_uri(plugin, uri,
+							    mutex, cond);
+			if (playlist != NULL)
+				break;
+		}
+	}
+
+	return playlist;
+}
+
+struct playlist_provider *
+playlist_list_open_uri(const char *uri, GMutex *mutex, GCond *cond)
+{
+	struct playlist_provider *playlist;
+	/** this array tracks which plugins have already been tried by
+	    playlist_list_open_uri_scheme() */
+	bool tried[G_N_ELEMENTS(playlist_plugins) - 1];
+
+	assert(uri != NULL);
+
+	memset(tried, false, sizeof(tried));
+
+	playlist = playlist_list_open_uri_scheme(uri, mutex, cond, tried);
+	if (playlist == NULL)
+		playlist = playlist_list_open_uri_suffix(uri, mutex, cond,
+							 tried);
+
+	return playlist;
+}
+
+static struct playlist_provider *
+playlist_list_open_stream_mime2(struct input_stream *is, const char *mime)
+{
+	struct playlist_provider *playlist;
+
+	assert(is != NULL);
+	assert(mime != NULL);
+
+	playlist_plugins_for_each_enabled(plugin) {
+		if (plugin->open_stream != NULL &&
+		    plugin->mime_types != NULL &&
+		    string_array_contains(plugin->mime_types, mime)) {
+			/* rewind the stream, so each plugin gets a
+			   fresh start */
+			input_stream_seek(is, 0, SEEK_SET, NULL);
+
+			playlist = playlist_plugin_open_stream(plugin, is);
+			if (playlist != NULL)
+				return playlist;
+		}
+	}
+
+	return NULL;
+}
+
+static struct playlist_provider *
+playlist_list_open_stream_mime(struct input_stream *is)
+{
+	assert(is->mime != NULL);
+
+	const char *semicolon = strchr(is->mime, ';');
+	if (semicolon == NULL)
+		return playlist_list_open_stream_mime2(is, is->mime);
+
+	if (semicolon == is->mime)
+		return NULL;
+
+	/* probe only the portion before the semicolon*/
+	char *mime = g_strndup(is->mime, semicolon - is->mime);
+	struct playlist_provider *playlist =
+		playlist_list_open_stream_mime2(is, mime);
+	g_free(mime);
+	return playlist;
+}
+
+static struct playlist_provider *
+playlist_list_open_stream_suffix(struct input_stream *is, const char *suffix)
+{
+	struct playlist_provider *playlist;
+
+	assert(is != NULL);
+	assert(suffix != NULL);
+
+	playlist_plugins_for_each_enabled(plugin) {
+		if (plugin->open_stream != NULL &&
+		    plugin->suffixes != NULL &&
+		    string_array_contains(plugin->suffixes, suffix)) {
+			/* rewind the stream, so each plugin gets a
+			   fresh start */
+			input_stream_seek(is, 0, SEEK_SET, NULL);
+
+			playlist = playlist_plugin_open_stream(plugin, is);
+			if (playlist != NULL)
+				return playlist;
+		}
+	}
+
+	return NULL;
+}
+
+struct playlist_provider *
+playlist_list_open_stream(struct input_stream *is, const char *uri)
+{
+	const char *suffix;
+	struct playlist_provider *playlist;
+
+	input_stream_lock_wait_ready(is);
+
+	if (is->mime != NULL) {
+		playlist = playlist_list_open_stream_mime(is);
+		if (playlist != NULL)
+			return playlist;
+	}
+
+	suffix = uri != NULL ? uri_get_suffix(uri) : NULL;
+	if (suffix != NULL) {
+		playlist = playlist_list_open_stream_suffix(is, suffix);
+		if (playlist != NULL)
+			return playlist;
+	}
+
+	return NULL;
+}
+
+bool
+playlist_suffix_supported(const char *suffix)
+{
+	assert(suffix != NULL);
+
+	playlist_plugins_for_each_enabled(plugin) {
+		if (plugin->suffixes != NULL &&
+		    string_array_contains(plugin->suffixes, suffix))
+			return true;
+	}
+
+	return false;
+}
+
+struct playlist_provider *
+playlist_list_open_path(const char *path_fs, GMutex *mutex, GCond *cond,
+			struct input_stream **is_r)
+{
+	GError *error = NULL;
+	const char *suffix;
+	struct input_stream *is;
+	struct playlist_provider *playlist;
+
+	assert(path_fs != NULL);
+
+	suffix = uri_get_suffix(path_fs);
+	if (suffix == NULL || !playlist_suffix_supported(suffix))
+		return NULL;
+
+	is = input_stream_open(path_fs, mutex, cond, &error);
+	if (is == NULL) {
+		if (error != NULL) {
+			g_warning("%s", error->message);
+			g_error_free(error);
+		}
+
+		return NULL;
+	}
+
+	input_stream_lock_wait_ready(is);
+
+	playlist = playlist_list_open_stream_suffix(is, suffix);
+	if (playlist != NULL)
+		*is_r = is;
+	else
+		input_stream_close(is);
+
+	return playlist;
+}