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/* the Music Player Daemon (MPD)
* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
* This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef MPD_TAG_H
#define MPD_TAG_H
#include "gcc.h"
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include <string.h>
enum tag_type {
TAG_ITEM_ARTIST,
TAG_ITEM_ALBUM,
TAG_ITEM_ALBUM_ARTIST,
TAG_ITEM_TITLE,
TAG_ITEM_TRACK,
TAG_ITEM_NAME,
TAG_ITEM_GENRE,
TAG_ITEM_DATE,
TAG_ITEM_COMPOSER,
TAG_ITEM_PERFORMER,
TAG_ITEM_COMMENT,
TAG_ITEM_DISC,
TAG_MUSICBRAINZ_ARTISTID,
TAG_MUSICBRAINZ_ALBUMID,
TAG_MUSICBRAINZ_ALBUMARTISTID,
TAG_MUSICBRAINZ_TRACKID,
TAG_NUM_OF_ITEM_TYPES
};
extern const char *tag_item_names[];
struct tag_item {
enum tag_type type;
char value[sizeof(long)];
} mpd_packed;
struct tag {
int time;
struct tag_item **items;
unsigned num_items;
};
struct tag *tag_new(void);
void tag_lib_init(void);
void tag_clear_items_by_type(struct tag *tag, enum tag_type itemType);
void tag_free(struct tag *tag);
/**
* Gives an optional hint to the tag library that we will now add
* several tag items; this is used by the library to optimize memory
* allocation. Only one tag may be in this state, and this tag must
* not have any items yet. You must call tag_end_add() when you are
* done.
*/
void tag_begin_add(struct tag *tag);
/**
* Finishes the operation started with tag_begin_add().
*/
void tag_end_add(struct tag *tag);
void tag_add_item_n(struct tag *tag, enum tag_type itemType,
const char *value, size_t len);
static inline void tag_add_item(struct tag *tag, enum tag_type itemType,
const char *value)
{
tag_add_item_n(tag, itemType, value, strlen(value));
}
struct tag *tag_dup(const struct tag *tag);
/**
* Merges the data from two tags. If both tags share data for the
* same tag_type, only data from "add" is used.
*
* @return a newly allocated tag, which must be freed with tag_free()
*/
struct tag *
tag_merge(const struct tag *base, const struct tag *add);
/**
* Returns true if the tag contains no items. This ignores the "time"
* attribute.
*/
static inline bool
tag_is_empty(const struct tag *tag)
{
return tag->num_items == 0;
}
/**
* Returns true if the tag contains any information.
*/
static inline bool
tag_is_defined(const struct tag *tag)
{
return !tag_is_empty(tag) || tag->time >= 0;
}
/**
* Returns the first value of the specified tag type, or NULL if none
* is present in this tag object.
*/
const char *
tag_get_value(const struct tag *tag, enum tag_type type);
/**
* Checks whether the tag contains one or more items with
* the specified type.
*/
bool tag_has_type(const struct tag *tag, enum tag_type type);
bool tag_equal(const struct tag *tag1, const struct tag *tag2);
#endif
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