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#ifndef __ALBUM_H__
#define __ALBUM_H__
#include "config.h"
#include <stdio.h>
struct album_entry {
char* name; // album name
char* key; // key for sorting/searching: album___artist___directory
uint32_t artist; // pointer to artist
uint32_t *song; // song-pointers
struct album_size {
uint32_t name_len; // length of this field (must be mulitple of 4)
uint32_t song_count; // number of song pointers
} size; // keeps the size of this thing
unsigned char flag; // flags
};
struct album_entry* new_album_entry(const uint32_t name_len, const uint32_t song_count);
/* Creates a new album_entry with the specified sizes
* Returns a pointer to the structure on success,
* NULL when malloc() fails
*/
int album_entry_destruct(struct album_entry *e);
/* Destructs the given album_entry and free()'s it's memory
* returns ERR_NONE on success (can never fail)
*/
inline int album_entry_resize(struct album_entry *e, const uint32_t name_len, const uint32_t song_count);
/* Change the size of the entry
* returns ERR_NONE on succes
* ERR_MALLOC when malloc() fails
*/
int album_entry_serialize(FILE *fd, const struct album_entry *e);
/* Serializes the entry in the file at the current position
* returns ERR_NONE on success
* ERR_FILE on fwrite() failure
*/
int album_entry_unserialize(struct album_entry* *e, FILE *fd);
/* Unserializes an entry from file into a new structure
* The address of the structure is saved into *e
* returns ERR_NONE on success
* ERR_MALLOC on malloc() failure
* ERR_FILE on fread() failure
*/
int album_entry_write(FILE *fd, struct album_entry *e, struct album_size *s);
/* Writes the entry to file in the final form
* returns ERR_NONE on success
* ERR_FILE on fwrite() failure
* ERR_MALLOC when e could not be resized due to malloc() problems
* If s is smaller than e, s is used!!!
*/
inline int album_entry_compare(const struct album_entry *a, const struct album_entry *b);
/* Compares 2 entries
* When a < b it returns <0
* a = b 0
* a > b >0
*/
struct album_size* new_album_size();
/* Creates a new size structure
* returns a pointer to the structure on success,
* NULL on malloc() failure
*/
inline uint32_t album_size_get_length(const struct album_size *size);
/* Calculates the length of the entry when written by album_entry_write()
* returns the length on success (can never fail)
*/
inline int album_size_max(struct album_size *s, const struct album_entry *e);
/* Updates the album_size structure to contain the maximal lengths of either
* the original entry in s, or the entry e
* returns ERR_NONE on success (can never fail)
*/
int album_size_destruct(struct album_size *s);
/* destructs the album_size structure
* returns ERR_NONE on success (can never fail)
*/
int album_entry_add_song_mem(struct album_entry *e, struct album_size *s, const uint32_t song);
/* Adds the song to the array
* returns ERR_NONE on success
* ERR_MALLOC on malloc() failure
*/
int album_entry_add_song_file(FILE *fd, struct album_entry *e, struct album_size *s, const uint32_t song);
/* Adds the song to the serialized entry in the file
* When this fails, the entry is invalidated and the function returns
* ERR_NO_INPLACE_UPDATE
* returns ERR_NONE on success
* ERR_NO_INPLACE_UPDATE (see above)
* ERR_FILE on fwrite() failure
*/
#endif
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