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
|
/*
* Copyright (C) 2003-2013 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.
*/
#ifndef MPD_TAG_HXX
#define MPD_TAG_HXX
#include "TagType.h"
#include "TagItem.hxx"
#include "Compiler.h"
#include <algorithm>
#include <stddef.h>
/**
* The meta information about a song file. It is a MPD specific
* subset of tags (e.g. from ID3, vorbis comments, ...).
*/
struct Tag {
/**
* The duration of the song (in seconds). A value of zero
* means that the length is unknown. If the duration is
* really between zero and one second, you should round up to
* 1.
*/
int time;
/**
* Does this file have an embedded playlist (e.g. embedded CUE
* sheet)?
*/
bool has_playlist;
/** an array of tag items */
TagItem **items;
/** the total number of tag items in the #items array */
unsigned num_items;
/**
* Create an empty tag.
*/
Tag():time(-1), has_playlist(false),
items(nullptr), num_items(0) {}
Tag(const Tag &other);
Tag(Tag &&other)
:time(other.time), has_playlist(other.has_playlist),
items(other.items), num_items(other.num_items) {
other.items = nullptr;
other.num_items = 0;
}
/**
* Free the tag object and all its items.
*/
~Tag();
Tag &operator=(const Tag &other) = delete;
Tag &operator=(Tag &&other) {
time = other.time;
has_playlist = other.has_playlist;
std::swap(items, other.items);
std::swap(num_items, other.num_items);
return *this;
}
/**
* Returns true if the tag contains no items. This ignores the "time"
* attribute.
*/
bool IsEmpty() const {
return num_items == 0;
}
/**
* Returns true if the tag contains any information.
*/
bool IsDefined() const {
return !IsEmpty() || time >= 0;
}
/**
* Clear everything, as if this was a new Tag object.
*/
void Clear();
/**
* Appends a new tag item.
*
* @param type the type of the new tag item
* @param value the value of the tag item (not null-terminated)
* @param len the length of #value
*/
void AddItem(TagType type, const char *value, size_t len);
/**
* Appends a new tag item.
*
* @param tag the #tag object
* @param type the type of the new tag item
* @param value the value of the tag item (null-terminated)
*/
void AddItem(TagType type, const char *value);
/**
* Merges the data from two tags. If both tags share data for the
* same TagType, only data from "add" is used.
*
* @return a newly allocated tag
*/
gcc_malloc
static Tag *Merge(const Tag &base, const Tag &add);
/**
* Merges the data from two tags. Any of the two may be NULL. Both
* are freed by this function.
*
* @return a newly allocated tag
*/
gcc_malloc
static Tag *MergeReplace(Tag *base, Tag *add);
/**
* Returns the first value of the specified tag type, or NULL if none
* is present in this tag object.
*/
gcc_pure
const char *GetValue(TagType type) const;
/**
* Checks whether the tag contains one or more items with
* the specified type.
*/
gcc_pure
bool HasType(TagType type) const;
private:
void AddItemInternal(TagType type, const char *value, size_t len);
};
/**
* Parse the string, and convert it into a #TagType. Returns
* #TAG_NUM_OF_ITEM_TYPES if the string could not be recognized.
*/
gcc_pure
TagType
tag_name_parse(const char *name);
/**
* Parse the string, and convert it into a #TagType. Returns
* #TAG_NUM_OF_ITEM_TYPES if the string could not be recognized.
*
* Case does not matter.
*/
gcc_pure
TagType
tag_name_parse_i(const char *name);
#endif
|
