ce49d99c2f
Since we switched from autotools to Meson in commit
94592c1406, we don't need to include
`config.h` early to properly enable large file support. Meson passes
the required macros on the compiler command line instead of defining
them in `config.h`.
This means we can include `config.h` at any time, whenever we want to
check its macros, and there are no ordering constraints.
182 lines
4.0 KiB
C++
182 lines
4.0 KiB
C++
/*
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* Copyright 2003-2018 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "AsxPlaylistPlugin.hxx"
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#include "../PlaylistPlugin.hxx"
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#include "../MemorySongEnumerator.hxx"
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#include "tag/Builder.hxx"
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#include "util/ASCII.hxx"
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#include "util/StringView.hxx"
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#include "lib/expat/ExpatParser.hxx"
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#include "Log.hxx"
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/**
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* This is the state object for our XML parser.
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*/
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struct AsxParser {
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/**
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* The list of songs (in reverse order because that's faster
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* while adding).
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*/
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std::forward_list<DetachedSong> songs;
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/**
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* The current position in the XML file.
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*/
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enum {
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ROOT, ENTRY,
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} state;
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/**
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* The current tag within the "entry" element. This is only
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* valid if state==ENTRY. TAG_NUM_OF_ITEM_TYPES means there
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* is no (known) tag.
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*/
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TagType tag_type;
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/**
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* The current song URI. It is set by the "ref" element.
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*/
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std::string location;
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TagBuilder tag_builder;
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AsxParser()
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:state(ROOT) {}
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};
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static void XMLCALL
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asx_start_element(void *user_data, const XML_Char *element_name,
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const XML_Char **atts)
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{
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AsxParser *parser = (AsxParser *)user_data;
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switch (parser->state) {
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case AsxParser::ROOT:
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if (StringEqualsCaseASCII(element_name, "entry")) {
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parser->state = AsxParser::ENTRY;
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parser->location.clear();
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parser->tag_type = TAG_NUM_OF_ITEM_TYPES;
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}
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break;
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case AsxParser::ENTRY:
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if (StringEqualsCaseASCII(element_name, "ref")) {
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const char *href =
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ExpatParser::GetAttributeCase(atts, "href");
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if (href != nullptr)
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parser->location = href;
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} else if (StringEqualsCaseASCII(element_name, "author"))
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/* is that correct? or should it be COMPOSER
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or PERFORMER? */
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parser->tag_type = TAG_ARTIST;
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else if (StringEqualsCaseASCII(element_name, "title"))
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parser->tag_type = TAG_TITLE;
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break;
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}
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}
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static void XMLCALL
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asx_end_element(void *user_data, const XML_Char *element_name)
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{
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AsxParser *parser = (AsxParser *)user_data;
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switch (parser->state) {
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case AsxParser::ROOT:
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break;
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case AsxParser::ENTRY:
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if (StringEqualsCaseASCII(element_name, "entry")) {
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if (!parser->location.empty())
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parser->songs.emplace_front(std::move(parser->location),
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parser->tag_builder.Commit());
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parser->state = AsxParser::ROOT;
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} else
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parser->tag_type = TAG_NUM_OF_ITEM_TYPES;
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break;
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}
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}
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static void XMLCALL
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asx_char_data(void *user_data, const XML_Char *s, int len)
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{
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AsxParser *parser = (AsxParser *)user_data;
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switch (parser->state) {
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case AsxParser::ROOT:
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break;
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case AsxParser::ENTRY:
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if (parser->tag_type != TAG_NUM_OF_ITEM_TYPES)
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parser->tag_builder.AddItem(parser->tag_type,
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StringView(s, len));
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break;
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}
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}
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/*
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* The playlist object
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*
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*/
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static std::unique_ptr<SongEnumerator>
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asx_open_stream(InputStreamPtr &&is)
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{
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AsxParser parser;
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{
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ExpatParser expat(&parser);
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expat.SetElementHandler(asx_start_element, asx_end_element);
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expat.SetCharacterDataHandler(asx_char_data);
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expat.Parse(*is);
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}
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parser.songs.reverse();
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return std::make_unique<MemorySongEnumerator>(std::move(parser.songs));
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}
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static const char *const asx_suffixes[] = {
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"asx",
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nullptr
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};
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static const char *const asx_mime_types[] = {
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"video/x-ms-asf",
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nullptr
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};
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const struct playlist_plugin asx_playlist_plugin = {
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"asx",
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nullptr,
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nullptr,
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nullptr,
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asx_open_stream,
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nullptr,
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asx_suffixes,
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asx_mime_types,
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};
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