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/*
* Copyright (C) 2003-2014 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 "Directory.hxx"
#include "Util.hxx"
#include "Expat.hxx"
#include <string>
#include <vector>
#include <map>
#include <string.h>
static const char *const upnptags[] = {
"upnp:artist",
"upnp:album",
"upnp:genre",
"upnp:originalTrackNumber",
"upnp:class",
nullptr,
};
static const char *const res_attributes[] = {
"protocolInfo",
"size",
"bitrate",
"duration",
"sampleFrequency",
"nrAudioChannels",
nullptr,
};
gcc_pure
static UPnPDirObject::ItemClass
ParseItemClass(const char *name)
{
if (strcmp(name, "object.item.audioItem.musicTrack") == 0)
return UPnPDirObject::ItemClass::MUSIC;
else if (strcmp(name, "object.item.playlistItem") == 0)
return UPnPDirObject::ItemClass::PLAYLIST;
else
return UPnPDirObject::ItemClass::UNKNOWN;
}
/**
* An XML parser which builds directory contents from DIDL lite input.
*/
class UPnPDirParser final : public CommonExpatParser {
std::vector<std::string> m_path;
UPnPDirObject m_tobj;
public:
UPnPDirParser(UPnPDirContent& dir)
:m_dir(dir)
{
}
UPnPDirContent& m_dir;
protected:
virtual void StartElement(const XML_Char *name, const XML_Char **attrs)
{
m_path.push_back(name);
std::map<std::string,std::string> attributes;
for (int i = 0; attrs[i] != 0; i += 2)
attributes[attrs[i]] = attrs[i+1];
switch (name[0]) {
case 'c':
if (!strcmp(name, "container")) {
m_tobj.clear();
m_tobj.type = UPnPDirObject::Type::CONTAINER;
m_tobj.m_id = attributes["id"];
m_tobj.m_pid = attributes["parentID"];
}
break;
case 'i':
if (!strcmp(name, "item")) {
m_tobj.clear();
m_tobj.type = UPnPDirObject::Type::ITEM;
m_tobj.m_id = attributes["id"];
m_tobj.m_pid = attributes["parentID"];
}
break;
case 'r':
if (!strcmp(name, "res")) {
// <res protocolInfo="http-get:*:audio/mpeg:*" size="5171496"
// bitrate="24576" duration="00:03:35" sampleFrequency="44100"
// nrAudioChannels="2">
for (auto i = res_attributes; *i != nullptr; ++i) {
const std::string s(*i);
m_tobj.m_props[s] = attributes[s];
}
}
break;
}
}
bool checkobjok() {
bool ok = !m_tobj.m_id.empty() && !m_tobj.m_pid.empty() &&
!m_tobj.m_title.empty();
if (ok && m_tobj.type == UPnPDirObject::Type::ITEM) {
const char *item_class_name =
m_tobj.m_props["upnp:class"].c_str();
auto item_class = ParseItemClass(item_class_name);
if (item_class == UPnPDirObject::ItemClass::UNKNOWN) {
PLOGINF("checkobjok: found object of unknown class: [%s]\n",
item_class_name);
ok = false;
} else {
m_tobj.item_class = item_class;
}
}
if (!ok) {
PLOGINF("checkobjok: skip: id [%s] pid [%s] clss [%s] tt [%s]\n",
m_tobj.m_id.c_str(), m_tobj.m_pid.c_str(),
m_tobj.m_props["upnp:class"].c_str(),
m_tobj.m_title.c_str());
}
return ok;
}
virtual void EndElement(const XML_Char *name)
{
if (!strcmp(name, "container")) {
if (checkobjok()) {
m_dir.m_containers.push_back(m_tobj);
}
} else if (!strcmp(name, "item")) {
if (checkobjok()) {
m_dir.m_items.push_back(m_tobj);
}
}
m_path.pop_back();
}
virtual void CharacterData(const XML_Char *s, int len)
{
if (s == 0 || *s == 0)
return;
std::string str(s, len);
trimstring(str);
switch (m_path.back()[0]) {
case 'd':
if (!m_path.back().compare("dc:title"))
m_tobj.m_title += str;
break;
case 'r':
if (!m_path.back().compare("res")) {
m_tobj.m_props["url"] += str;
}
break;
case 'u':
for (auto i = upnptags; *i != nullptr; ++i)
if (!m_path.back().compare(*i))
m_tobj.m_props[*i] += str;
break;
}
}
};
bool
UPnPDirContent::parse(const std::string &input, Error &error)
{
UPnPDirParser parser(*this);
return parser.Parse(input.data(), input.length(), true, error);
}
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