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/* Miscellaneous subroutines for mp3fs. */
#define FUSE_USE_VERSION 26
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <err.h>
#include <sys/types.h>
#include <sys/param.h>
#include <dirent.h>
#include <fuse.h>
#include <tag_c.h>
#include <mp3fs.h>
#include <mnode.h>
#include <queue.h>
#include <debug.h>
struct queryvector {
char *artist;
char *title;
char *genre;
};
/* Local prototypes. */
static int isduplicate(struct collection *, struct queryvector *, int);
static void free_query_vector(struct queryvector *);
static void fill_query_vector(struct queryvector *, struct mnode *);
static int query_matches(struct queryvector *, struct queryvector *, int);
/* Simple list containing our nodes. */
struct collection allmusic;
void
mp3_initscan(char *musicpath)
{
LIST_INIT(&allmusic.head);
traverse_hierarchy(musicpath, mp3_scan, &allmusic);
}
/*
* Traverse a hierarchy given a directory path. Perform fileoperations on the
* files in the directory giving data as arguments, as well as recursing on
* sub-directories.
*/
void
traverse_hierarchy(char *dirpath, traverse_fn_t fileop, struct collection *coll)
{
DIR *dirp;
struct dirent *dp;
char filepath[MAXPATHLEN];
struct stat st;
dirp = opendir(dirpath);
if (dirp == NULL)
return;
/* Loop through all files. */
while ((dp = readdir(dirp)) != NULL) {
if (!strcmp(dp->d_name, ".") ||
!strcmp(dp->d_name, ".."))
continue;
snprintf(filepath, sizeof(filepath), "%s/%s",
dirpath, dp->d_name);
if (stat(filepath, &st) < 0)
err(1, "error doing stat on %s", filepath);
/* Recurse if it's a directory. */
if (st.st_mode & S_IFDIR) {
traverse_hierarchy(filepath, fileop, coll);
continue;
}
/* If it's a regular file, perform the operation. */
if (st.st_mode & S_IFREG) {
fileop(filepath, coll);
}
}
closedir(dirp);
}
/* Scan the music initially. */
void
mp3_scan(char *filepath, struct collection *coll)
{
struct mnode *mp_new;
mp_new = malloc(sizeof(struct mnode));
if (mp_new == NULL)
err(1, "malloc");
mp_new->tag = taglib_file_new(filepath);
mp_new->path = strdup(filepath);
if (mp_new->path == NULL)
err(1, "strdup");
/* Insert node into music list. */
LIST_INSERT_HEAD(&coll->head, mp_new, coll_next);
#ifdef DEBUGGING
LIST_FOREACH(mp_new, &coll->head, coll_next) {
DEBUG("Loaded '%s' into database\n", mp_new->path);
}
#endif
}
/*
* Given a selection, fetch out the wanted tag and use filler.
*/
void
mp3_filter(struct collection *selection, int filter, struct filler_data *fd)
{
TagLib_Tag *tag;
struct mnode *mp;
char *field, name[MAXPATHLEN];
LIST_FOREACH(mp, &selection->head, sel_next) {
tag = taglib_file_tag(mp->tag);
switch (filter) {
case FILTER_ARTIST:
field = taglib_tag_artist(tag);
break;
case FILTER_GENRE:
field = taglib_tag_genre(tag);
break;
case FILTER_TITLE:
field = taglib_tag_title(tag);
break;
default:
err(1, "invalid filter given");
break;
}
if (field == NULL || !strcmp(field, ""))
continue;
/* XXX: check if we need to free this or not. */
strncpy(name, field, sizeof(name));
fd->filler(fd->buf, name, NULL, 0);
}
}
/*
* Perform a query selecting artists given a filter.
*/
struct collection *
mp3_select(int flags, char *artist, char *title, char *genre)
{
struct mnode *mp;
struct collection *selection;
struct queryvector qv, qv2;
if (flags & SELECT_ARTIST)
qv.artist = artist;
if (flags & SELECT_TITLE)
qv.title = title;
if (flags & SELECT_GENRE)
qv.genre = genre;
/* Initialize selection structure. */
selection = malloc(sizeof(struct collection));
if (selection == NULL)
return (NULL);
LIST_INIT(&selection->head);
/* Filter our collection. */
LIST_FOREACH(mp, &allmusic.head, coll_next) {
/* First make sure it matches our criteria. */
fill_query_vector(&qv2, mp);
if (query_matches(&qv2, &qv, flags) && !isduplicate(selection,
&qv2, flags))
LIST_INSERT_HEAD(&selection->head, mp, sel_next);
free_query_vector(&qv2);
}
return (selection);
}
/*
* Filter out unique fields.
*/
static int
isduplicate(struct collection *selection, struct queryvector *qv, int flags)
{
struct mnode *mp2;
struct queryvector qv_entry;
LIST_FOREACH(mp2, &selection->head, sel_next) {
/* Compare to determine if it's a duplicate. */
fill_query_vector(&qv_entry, mp2);
if (query_matches(&qv_entry, qv, flags)) {
free_query_vector(&qv_entry);
return (1);
}
free_query_vector(&qv_entry);
}
return (0);
}
/* Fill in a query vector given a node with tags. */
static void
fill_query_vector(struct queryvector *qv, struct mnode *mp)
{
TagLib_Tag *tag;
tag = taglib_file_tag(mp->tag);
qv->artist = strdup(taglib_tag_artist(tag));
qv->title = strdup(taglib_tag_title(tag));
qv->genre = strdup(taglib_tag_genre(tag));
taglib_tag_free_strings();
}
/* Free a query vector. */
static void
free_query_vector(struct queryvector *qv)
{
if (qv->artist != NULL)
free(qv->artist);
if (qv->title != NULL)
free(qv->title);
if (qv->genre != NULL)
free(qv->genre);
}
/* Determine if two query vectors matches. */
static int
query_matches(struct queryvector *qv1, struct queryvector *qv2, int flags)
{
/* Check if it matches the different fields. */
if ((flags & SELECT_ARTIST) && qv1->artist != NULL && qv2->artist != NULL) {
if (strcmp(qv1->artist, qv2->artist))
return (0);
}
if ((flags & SELECT_TITLE) && qv1->title != NULL && qv2->title != NULL) {
if (strcmp(qv1->title, qv2->title))
return (0);
}
if ((flags & SELECT_GENRE) && qv1->genre != NULL && qv2->genre != NULL) {
if (strcmp(qv1->genre, qv2->genre))
return (0);
}
return (1);
}
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