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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 "Tags.hxx"
#include "tag/TagBuilder.hxx"
#include "tag/TagTable.hxx"
#include "util/NumberParser.hxx"
#include <algorithm>
#include <string>
#include <vector>
#include <string.h>
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;
}
gcc_pure
static int
ParseDuration(const char *duration)
{
char *endptr;
unsigned result = ParseUnsigned(duration, &endptr);
if (endptr == duration || *endptr != ':')
return 0;
result *= 60;
duration = endptr + 1;
result += ParseUnsigned(duration, &endptr);
if (endptr == duration || *endptr != ':')
return 0;
result *= 60;
duration = endptr + 1;
result += ParseUnsigned(duration, &endptr);
if (endptr == duration || *endptr != 0)
return 0;
return result;
}
/**
* Transform titles to turn '/' into '_' to make them acceptable path
* elements. There is a very slight risk of collision in doing
* this. Twonky returns directory names (titles) like 'Artist/Album'.
*/
gcc_pure
static std::string
titleToPathElt(std::string &&s)
{
std::replace(s.begin(), s.end(), '/', '_');
return s;
}
/**
* 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;
TagBuilder tag;
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);
switch (name[0]) {
case 'c':
if (!strcmp(name, "container")) {
m_tobj.clear();
m_tobj.type = UPnPDirObject::Type::CONTAINER;
const char *id = GetAttribute(attrs, "id");
if (id != nullptr)
m_tobj.m_id = id;
const char *pid = GetAttribute(attrs, "parentID");
if (pid != nullptr)
m_tobj.m_pid = pid;
}
break;
case 'i':
if (!strcmp(name, "item")) {
m_tobj.clear();
m_tobj.type = UPnPDirObject::Type::ITEM;
const char *id = GetAttribute(attrs, "id");
if (id != nullptr)
m_tobj.m_id = id;
const char *pid = GetAttribute(attrs, "parentID");
if (pid != nullptr)
m_tobj.m_pid = pid;
}
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">
const char *duration =
GetAttribute(attrs, "duration");
if (duration != nullptr)
tag.SetTime(ParseDuration(duration));
}
break;
}
}
bool checkobjok() {
if (m_tobj.m_id.empty() || m_tobj.m_pid.empty() ||
m_tobj.name.empty() ||
(m_tobj.type == UPnPDirObject::Type::ITEM &&
m_tobj.item_class == UPnPDirObject::ItemClass::UNKNOWN))
return false;
return true;
}
virtual void EndElement(const XML_Char *name)
{
if ((!strcmp(name, "container") || !strcmp(name, "item")) &&
checkobjok()) {
tag.Commit(m_tobj.tag);
m_dir.objects.push_back(std::move(m_tobj));
}
m_path.pop_back();
}
virtual void CharacterData(const XML_Char *s, int len)
{
const auto ¤t = m_path.back();
std::string str = trimstring(s, len);
TagType type = tag_table_lookup(upnp_tags,
current.c_str());
if (type != TAG_NUM_OF_ITEM_TYPES) {
tag.AddItem(type, str.c_str());
if (type == TAG_TITLE)
m_tobj.name = titleToPathElt(std::move(str));
return;
}
switch (current[0]) {
case 'r':
if (!current.compare("res")) {
m_tobj.url = std::move(str);
}
break;
case 'u':
if (current == "upnp:class") {
m_tobj.item_class = ParseItemClass(str.c_str());
break;
}
break;
}
}
};
bool
UPnPDirContent::parse(const char *input, Error &error)
{
UPnPDirParser parser(*this);
return parser.Parse(input, strlen(input), true, error);
}
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