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
|
/*
* Copyright (C) 2003-2015 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 "AsxPlaylistPlugin.hxx"
#include "../PlaylistPlugin.hxx"
#include "../MemorySongEnumerator.hxx"
#include "tag/TagBuilder.hxx"
#include "util/ASCII.hxx"
#include "util/Error.hxx"
#include "util/StringView.hxx"
#include "lib/expat/ExpatParser.hxx"
#include "Log.hxx"
/**
* This is the state object for our XML parser.
*/
struct AsxParser {
/**
* The list of songs (in reverse order because that's faster
* while adding).
*/
std::forward_list<DetachedSong> songs;
/**
* The current position in the XML file.
*/
enum {
ROOT, ENTRY,
} state;
/**
* The current tag within the "entry" element. This is only
* valid if state==ENTRY. TAG_NUM_OF_ITEM_TYPES means there
* is no (known) tag.
*/
TagType tag_type;
/**
* The current song URI. It is set by the "ref" element.
*/
std::string location;
TagBuilder tag_builder;
AsxParser()
:state(ROOT) {}
};
static void XMLCALL
asx_start_element(void *user_data, const XML_Char *element_name,
const XML_Char **atts)
{
AsxParser *parser = (AsxParser *)user_data;
switch (parser->state) {
case AsxParser::ROOT:
if (StringEqualsCaseASCII(element_name, "entry")) {
parser->state = AsxParser::ENTRY;
parser->location.clear();
parser->tag_type = TAG_NUM_OF_ITEM_TYPES;
}
break;
case AsxParser::ENTRY:
if (StringEqualsCaseASCII(element_name, "ref")) {
const char *href =
ExpatParser::GetAttributeCase(atts, "href");
if (href != nullptr)
parser->location = href;
} else if (StringEqualsCaseASCII(element_name, "author"))
/* is that correct? or should it be COMPOSER
or PERFORMER? */
parser->tag_type = TAG_ARTIST;
else if (StringEqualsCaseASCII(element_name, "title"))
parser->tag_type = TAG_TITLE;
break;
}
}
static void XMLCALL
asx_end_element(void *user_data, const XML_Char *element_name)
{
AsxParser *parser = (AsxParser *)user_data;
switch (parser->state) {
case AsxParser::ROOT:
break;
case AsxParser::ENTRY:
if (StringEqualsCaseASCII(element_name, "entry")) {
if (!parser->location.empty())
parser->songs.emplace_front(std::move(parser->location),
parser->tag_builder.Commit());
parser->state = AsxParser::ROOT;
} else
parser->tag_type = TAG_NUM_OF_ITEM_TYPES;
break;
}
}
static void XMLCALL
asx_char_data(void *user_data, const XML_Char *s, int len)
{
AsxParser *parser = (AsxParser *)user_data;
switch (parser->state) {
case AsxParser::ROOT:
break;
case AsxParser::ENTRY:
if (parser->tag_type != TAG_NUM_OF_ITEM_TYPES)
parser->tag_builder.AddItem(parser->tag_type,
StringView(s, len));
break;
}
}
/*
* The playlist object
*
*/
static SongEnumerator *
asx_open_stream(InputStream &is)
{
AsxParser parser;
{
ExpatParser expat(&parser);
expat.SetElementHandler(asx_start_element, asx_end_element);
expat.SetCharacterDataHandler(asx_char_data);
Error error;
if (!expat.Parse(is, error)) {
LogError(error);
return nullptr;
}
}
parser.songs.reverse();
return new MemorySongEnumerator(std::move(parser.songs));
}
static const char *const asx_suffixes[] = {
"asx",
nullptr
};
static const char *const asx_mime_types[] = {
"video/x-ms-asf",
nullptr
};
const struct playlist_plugin asx_playlist_plugin = {
"asx",
nullptr,
nullptr,
nullptr,
asx_open_stream,
nullptr,
asx_suffixes,
asx_mime_types,
};
|
