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/*
* Copyright 2003-2019 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 "Directory.hxx"
#include "lib/upnp/Util.hxx"
#include "lib/expat/ExpatParser.hxx"
#include "Tags.hxx"
#include "tag/Builder.hxx"
#include "tag/Table.hxx"
#include "util/NumberParser.hxx"
#include "util/StringView.hxx"
#include <algorithm>
#include <string>
#include <string.h>
UPnPDirContent::~UPnPDirContent()
{
/* this destructor exists here just so it won't get inlined */
}
gcc_pure
static UPnPDirObject::ItemClass
ParseItemClass(StringView name) noexcept
{
if (name.Equals("object.item.audioItem.musicTrack"))
return UPnPDirObject::ItemClass::MUSIC;
else if (name.Equals("object.item.playlistItem"))
return UPnPDirObject::ItemClass::PLAYLIST;
else
return UPnPDirObject::ItemClass::UNKNOWN;
}
gcc_pure
static SignedSongTime
ParseDuration(const char *duration) noexcept
{
char *endptr;
int hours = ParseInt(duration, &endptr);
if (endptr == duration || *endptr != ':')
return SignedSongTime::Negative();
duration = endptr + 1;
unsigned minutes = ParseUnsigned(duration, &endptr);
if (endptr == duration || *endptr != ':')
return SignedSongTime::Negative();
duration = endptr + 1;
double seconds = ParseDouble(duration, &endptr);
if (endptr == duration || *endptr != 0 || seconds < 0.0)
return SignedSongTime::Negative();
return SignedSongTime::FromS((((hours * 60) + minutes) * 60) + seconds);
}
/**
* 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 &&
TitleToPathSegment(std::string &&s) noexcept
{
std::replace(s.begin(), s.end(), '/', '_');
return std::move(s);
}
/**
* An XML parser which builds directory contents from DIDL lite input.
*/
class UPnPDirParser final : public CommonExpatParser {
UPnPDirContent &directory;
enum {
NONE,
RES,
CLASS,
} state;
/**
* If not equal to #TAG_NUM_OF_ITEM_TYPES, then we're
* currently reading an element containing a tag value. The
* value is being constructed in #value.
*/
TagType tag_type;
/**
* The text inside the current element.
*/
std::string value;
UPnPDirObject object;
TagBuilder tag;
public:
UPnPDirParser(UPnPDirContent &_directory)
:directory(_directory),
state(NONE),
tag_type(TAG_NUM_OF_ITEM_TYPES)
{
object.Clear();
}
protected:
void StartElement(const XML_Char *name, const XML_Char **attrs) override
{
if (object.type != UPnPDirObject::Type::UNKNOWN &&
tag_type == TAG_NUM_OF_ITEM_TYPES) {
tag_type = tag_table_lookup(upnp_tags, name);
if (tag_type != TAG_NUM_OF_ITEM_TYPES)
return;
} else {
assert(tag_type == TAG_NUM_OF_ITEM_TYPES);
}
switch (name[0]) {
case 'c':
if (!strcmp(name, "container")) {
object.Clear();
object.type = UPnPDirObject::Type::CONTAINER;
const char *id = GetAttribute(attrs, "id");
if (id != nullptr)
object.id = id;
const char *pid = GetAttribute(attrs, "parentID");
if (pid != nullptr)
object.parent_id = pid;
}
break;
case 'i':
if (!strcmp(name, "item")) {
object.Clear();
object.type = UPnPDirObject::Type::ITEM;
const char *id = GetAttribute(attrs, "id");
if (id != nullptr)
object.id = id;
const char *pid = GetAttribute(attrs, "parentID");
if (pid != nullptr)
object.parent_id = 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.SetDuration(ParseDuration(duration));
state = RES;
}
break;
case 'u':
if (strcmp(name, "upnp:class") == 0)
state = CLASS;
}
}
void EndElement(const XML_Char *name) override
{
if (tag_type != TAG_NUM_OF_ITEM_TYPES) {
assert(object.type != UPnPDirObject::Type::UNKNOWN);
tag.AddItem(tag_type, value.c_str());
if (tag_type == TAG_TITLE)
object.name = TitleToPathSegment(std::move(value));
value.clear();
tag_type = TAG_NUM_OF_ITEM_TYPES;
return;
}
if ((!strcmp(name, "container") || !strcmp(name, "item")) &&
object.Check()) {
tag.Commit(object.tag);
directory.objects.emplace_back(std::move(object));
}
state = NONE;
}
void CharacterData(const XML_Char *s, int len) override
{
if (tag_type != TAG_NUM_OF_ITEM_TYPES) {
assert(object.type != UPnPDirObject::Type::UNKNOWN);
value.append(s, len);
return;
}
switch (state) {
case NONE:
break;
case RES:
object.url.assign(s, len);
break;
case CLASS:
object.item_class = ParseItemClass(StringView(s, len));
break;
}
}
};
void
UPnPDirContent::Parse(const char *input)
{
UPnPDirParser parser(*this);
parser.Parse(input, strlen(input), true);
}
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