1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/*
* 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 <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);
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">
for (auto i = res_attributes; *i != nullptr; ++i) {
const char *value = GetAttribute(attrs, *i);
if (value != nullptr)
m_tobj.m_props.emplace(*i, value);
}
}
break;
}
}
bool checkobjok() {
if (m_tobj.m_id.empty() || m_tobj.m_pid.empty() ||
m_tobj.m_title.empty())
return false;
if (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)
return false;
m_tobj.item_class = item_class;
}
return true;
}
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)
{
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);
}
|
