/* Copyright (C) 2013 J.F.Dockes
* 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.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "libupnpp/control/cdircontent.hxx"
#include <expat.h> // for XML_GetCurrentByteIndex
#include <expat_external.h> // for XML_Char, XML_Size
#include <string.h> // for strcmp
#include <string> // for string, allocator, etc
#include <unordered_map> // for unordered_map, etc
#include <vector> // for vector
#include "libupnpp/expatmm.hxx" // for inputRefXMLParser
#include "libupnpp/log.hxx" // for LOGINF
#include "libupnpp/upnpp_p.hxx" // for trimstring
using namespace std;
using namespace UPnPP;
namespace UPnPClient {
// An XML parser which builds directory contents from DIDL-lite input.
class UPnPDirParser : public inputRefXMLParser {
public:
UPnPDirParser(UPnPDirContent& dir, const string& input)
: inputRefXMLParser(input), m_dir(dir)
{
//LOGDEB("UPnPDirParser: input: " << input << endl);
m_okitems["object.item.audioItem.musicTrack"] =
UPnPDirObject::audioItem_musicTrack;
m_okitems["object.item.playlistItem"] =
UPnPDirObject::audioItem_playlist;
}
UPnPDirContent& m_dir;
protected:
class StackEl {
public:
StackEl(const string& nm) : name(nm) {}
string name;
XML_Size sta;
unordered_map<string,string> attributes;
string data;
};
virtual void StartElement(const XML_Char *name, const XML_Char **attrs)
{
//LOGDEB("startElement: name [" << name << "]" << " bpos " <<
// XML_GetCurrentByteIndex(expat_parser) << endl);
m_path.push_back(StackEl(name));
m_path.back().sta = XML_GetCurrentByteIndex(expat_parser);
for (int i = 0; attrs[i] != 0; i += 2) {
m_path.back().attributes[attrs[i]] = attrs[i+1];
}
switch (name[0]) {
case 'c':
if (!strcmp(name, "container")) {
m_tobj.clear();
m_tobj.m_type = UPnPDirObject::container;
m_tobj.m_id = m_path.back().attributes["id"];
m_tobj.m_pid = m_path.back().attributes["parentID"];
}
break;
case 'i':
if (!strcmp(name, "item")) {
m_tobj.clear();
m_tobj.m_type = UPnPDirObject::item;
m_tobj.m_id = m_path.back().attributes["id"];
m_tobj.m_pid = m_path.back().attributes["parentID"];
}
break;
default:
break;
}
}
virtual bool checkobjok()
{
// I don't see the point of this checking any more. Let the caller deal
// with filtering entries.
return true;
bool ok = !m_tobj.m_id.empty() && !m_tobj.m_pid.empty() &&
!m_tobj.m_title.empty();
if (ok && m_tobj.m_type == UPnPDirObject::item) {
map<string, UPnPDirObject::ItemClass>::const_iterator it;
it = m_okitems.find(m_tobj.m_props["upnp:class"]);
if (it == m_okitems.end()) {
LOGINF("checkobjok: found object of unknown class: [" <<
m_tobj.m_props["upnp:class"] << endl);
ok = false;
} else {
m_tobj.m_iclass = it->second;
}
}
if (!ok) {
LOGINF("checkobjok:skip: id ["<< m_tobj.m_id<<"] pid ["<<
m_tobj.m_pid << "] clss [" << m_tobj.m_props["upnp:class"]
<< "] tt [" << m_tobj.m_title << "]" << endl);
}
return ok;
}
virtual void EndElement(const XML_Char *name)
{
string parentname;
if (m_path.size() == 1) {
parentname = "root";
} else {
parentname = m_path[m_path.size()-2].name;
}
//LOGDEB("Closing element " << name << " inside element " <<
// parentname << " data " << m_path.back().data << endl);
if (!strcmp(name, "container")) {
if (checkobjok()) {
m_dir.m_containers.push_back(m_tobj);
}
} else if (!strcmp(name, "item")) {
if (checkobjok()) {
unsigned int len = XML_GetCurrentByteIndex(expat_parser) -
m_path.back().sta;
m_tobj.m_didlfrag = m_input.substr(m_path.back().sta, len)
+ "</item></DIDL-Lite>";
m_dir.m_items.push_back(m_tobj);
}
} else if (!parentname.compare("item") ||
!parentname.compare("container")) {
switch (name[0]) {
case 'd':
if (!strcmp(name, "dc:title"))
m_tobj.m_title = m_path.back().data;
break;
case 'r':
if (!strcmp(name, "res")) {
// <res protocolInfo="http-get:*:audio/mpeg:*" size="517149"
// bitrate="24576" duration="00:03:35"
// sampleFrequency="44100" nrAudioChannels="2">
UPnPResource res;
res.m_uri = m_path.back().data;
for (auto it = m_path.back().attributes.begin();
it != m_path.back().attributes.end(); it++) {
res.m_props[it->first] = it->second;
}
m_tobj.m_resources.push_back(res);
}
break;
default:
m_tobj.m_props[name] = m_path.back().data;
break;
}
}
m_path.pop_back();
}
virtual void CharacterData(const XML_Char *s, int len)
{
if (s == 0 || *s == 0)
return;
string str(s, len);
trimstring(str);
m_path.back().data += str;
}
private:
vector<StackEl> m_path;
UPnPDirObject m_tobj;
map<string, UPnPDirObject::ItemClass> m_okitems;
};
bool UPnPDirContent::parse(const std::string& input)
{
UPnPDirParser parser(*this, input);
return parser.Parse();
}
static const string didl_header(
"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
"<DIDL-Lite xmlns=\"urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/\""
" xmlns:dc=\"http://purl.org/dc/elements/1.1/\""
" xmlns:upnp=\"urn:schemas-upnp-org:metadata-1-0/upnp/\""
" xmlns:dlna=\"urn:schemas-dlna-org:metadata-1-0/\">");
// Maybe we'll do something about building didl from scratch if this
// proves necessary.
string UPnPDirObject::getdidl() const
{
return didl_header + m_didlfrag;
}
} // namespace