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#ifndef __SONG_H__
#define __SONG_H__
#include "config.h"
#include <stdio.h>
#include <stdint.h>
struct song_entry {
char* name; // song name
uint32_t artist; // pointer to artist
uint32_t album; // pointer to album
uint32_t file; // pointer to file
char* genre; // genre
uint16_t bitrate; // bitrate (-1 = VBR or unknown)
uint16_t year;
uint32_t playtime; // in seconds
uint16_t track;
uint16_t samplerate; // in Hz
struct song_size {
uint32_t name_len; // must be mulitple of 4
uint32_t genre_len; // must be multiple of 4
} size;
unsigned char flag; // flags
};
struct song_entry* new_song_entry(const uint32_t name_len, const uint32_t genre_len);
/* Creates a new song_entry with the specified sizes
* Returns a pointer to the structure on success,
* NULL on failure
*/
int song_entry_destruct(struct song_entry *e);
/* Destructs the given song_entry and free()'s it's memory
* returns 0 on success, 1 on failure
*/
inline int song_entry_resize(struct song_entry *e, const uint32_t name_len, const uint32_t genre_len);
/* Change the size of the entry
* returns 0 on succes, 1 on failure
*/
int song_entry_serialize(FILE *fd, const struct song_entry *e);
/* Serializes the entry in the file at the current position
* returns 0 on success, 1 on failure
*/
int song_entry_unserialize(struct song_entry* *e, FILE *fd);
/* Unserializes an entry from file into a new structure
* The address of the structure is saved into *e
* returns 0 on success
* 1 on malloc() failure
* 2 on fread() failure
*/
int song_entry_write(FILE *fd, struct song_entry *e, struct song_size *s);
/* Writes the entry to file in the final form
* returns 0 (0) on success, 1 (1) on failure
*/
inline int song_entry_compare(const struct song_entry *a, const struct song_entry *b);
/* Compares 2 entries
* When a < b it returns <0
* a = b 0
* a > b >0
*/
struct song_size* new_song_size();
/* Creates a new size structure
* returns a pointer to the structure on success,
* NULL on failure
*/
inline uint32_t song_size_get_length(const struct song_size *size);
/* Calculates the length of the entry when written by song_entry_write()
* returns the length on success, 0xffffffff on failure
*/
inline int song_size_max(struct song_size *s, const struct song_entry *e);
/* Updates the song_size structure to contain the maximal lengths of either
* the original entry in s, or the entry e
* returns 0 on success, 1 on failure
*/
int song_size_destruct(struct song_size *s);
/* destructs the song_size structure
* returns 0 on success, 1 on failure
*/
#endif
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