/* * 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 "XspfPlaylistPlugin.hxx" #include "MemoryPlaylistProvider.hxx" #include "input_stream.h" #include "tag.h" #include #include #include #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "xspf" /** * This is the state object for the GLib XML parser. */ struct XspfParser { /** * The list of songs (in reverse order because that's faster * while adding). */ std::forward_list songs; /** * The current position in the XML file. */ enum { ROOT, PLAYLIST, TRACKLIST, TRACK, LOCATION, } state; /** * The current tag within the "track" element. This is only * valid if state==TRACK. TAG_NUM_OF_ITEM_TYPES means there * is no (known) tag. */ enum tag_type tag; /** * The current song. It is allocated after the "location" * element. */ Song *song; XspfParser() :state(ROOT) {} }; static void xspf_start_element(G_GNUC_UNUSED GMarkupParseContext *context, const gchar *element_name, G_GNUC_UNUSED const gchar **attribute_names, G_GNUC_UNUSED const gchar **attribute_values, gpointer user_data, G_GNUC_UNUSED GError **error) { XspfParser *parser = (XspfParser *)user_data; switch (parser->state) { case XspfParser::ROOT: if (strcmp(element_name, "playlist") == 0) parser->state = XspfParser::PLAYLIST; break; case XspfParser::PLAYLIST: if (strcmp(element_name, "trackList") == 0) parser->state = XspfParser::TRACKLIST; break; case XspfParser::TRACKLIST: if (strcmp(element_name, "track") == 0) { parser->state = XspfParser::TRACK; parser->song = NULL; parser->tag = TAG_NUM_OF_ITEM_TYPES; } break; case XspfParser::TRACK: if (strcmp(element_name, "location") == 0) parser->state = XspfParser::LOCATION; else if (strcmp(element_name, "title") == 0) parser->tag = TAG_TITLE; else if (strcmp(element_name, "creator") == 0) /* TAG_COMPOSER would be more correct according to the XSPF spec */ parser->tag = TAG_ARTIST; else if (strcmp(element_name, "annotation") == 0) parser->tag = TAG_COMMENT; else if (strcmp(element_name, "album") == 0) parser->tag = TAG_ALBUM; else if (strcmp(element_name, "trackNum") == 0) parser->tag = TAG_TRACK; break; case XspfParser::LOCATION: break; } } static void xspf_end_element(G_GNUC_UNUSED GMarkupParseContext *context, const gchar *element_name, gpointer user_data, G_GNUC_UNUSED GError **error) { XspfParser *parser = (XspfParser *)user_data; switch (parser->state) { case XspfParser::ROOT: break; case XspfParser::PLAYLIST: if (strcmp(element_name, "playlist") == 0) parser->state = XspfParser::ROOT; break; case XspfParser::TRACKLIST: if (strcmp(element_name, "tracklist") == 0) parser->state = XspfParser::PLAYLIST; break; case XspfParser::TRACK: if (strcmp(element_name, "track") == 0) { if (parser->song != NULL) parser->songs.emplace_front(parser->song); parser->state = XspfParser::TRACKLIST; } else parser->tag = TAG_NUM_OF_ITEM_TYPES; break; case XspfParser::LOCATION: parser->state = XspfParser::TRACK; break; } } static void xspf_text(G_GNUC_UNUSED GMarkupParseContext *context, const gchar *text, gsize text_len, gpointer user_data, G_GNUC_UNUSED GError **error) { XspfParser *parser = (XspfParser *)user_data; switch (parser->state) { case XspfParser::ROOT: case XspfParser::PLAYLIST: case XspfParser::TRACKLIST: break; case XspfParser::TRACK: if (parser->song != NULL && parser->tag != TAG_NUM_OF_ITEM_TYPES) { if (parser->song->tag == NULL) parser->song->tag = tag_new(); tag_add_item_n(parser->song->tag, parser->tag, text, text_len); } break; case XspfParser::LOCATION: if (parser->song == NULL) { char *uri = g_strndup(text, text_len); parser->song = Song::NewRemote(uri); g_free(uri); } break; } } static const GMarkupParser xspf_parser = { xspf_start_element, xspf_end_element, xspf_text, nullptr, nullptr, }; static void xspf_parser_destroy(gpointer data) { XspfParser *parser = (XspfParser *)data; if (parser->state >= XspfParser::TRACK && parser->song != NULL) parser->song->Free(); } /* * The playlist object * */ static struct playlist_provider * xspf_open_stream(struct input_stream *is) { XspfParser parser; GMarkupParseContext *context; char buffer[1024]; size_t nbytes; bool success; GError *error = NULL; /* parse the XSPF XML file */ context = g_markup_parse_context_new(&xspf_parser, G_MARKUP_TREAT_CDATA_AS_TEXT, &parser, xspf_parser_destroy); while (true) { nbytes = input_stream_lock_read(is, buffer, sizeof(buffer), &error); if (nbytes == 0) { if (error != NULL) { g_markup_parse_context_free(context); g_warning("%s", error->message); g_error_free(error); return NULL; } break; } success = g_markup_parse_context_parse(context, buffer, nbytes, &error); if (!success) { g_warning("XML parser failed: %s", error->message); g_error_free(error); g_markup_parse_context_free(context); return NULL; } } success = g_markup_parse_context_end_parse(context, &error); if (!success) { g_warning("XML parser failed: %s", error->message); g_error_free(error); g_markup_parse_context_free(context); return NULL; } parser.songs.reverse(); MemoryPlaylistProvider *playlist = new MemoryPlaylistProvider(std::move(parser.songs)); g_markup_parse_context_free(context); return playlist; } static const char *const xspf_suffixes[] = { "xspf", NULL }; static const char *const xspf_mime_types[] = { "application/xspf+xml", NULL }; const struct playlist_plugin xspf_playlist_plugin = { "xspf", nullptr, nullptr, nullptr, xspf_open_stream, nullptr, nullptr, nullptr, xspf_suffixes, xspf_mime_types, };