mpd/src/song.c

/* the Music Player Daemon (MPD)
 * (c)2003-2006 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
 */

#include "song.h"
#include "ls.h"
#include "directory.h"
#include "utils.h"
#include "tag.h"
#include "log.h"
#include "path.h"
#include "playlist.h"
#include "inputPlugin.h"

#define SONG_KEY	"key: "
#define SONG_FILE	"file: "
#define SONG_TIME	"Time: "
#define SONG_MTIME	"mtime: "

#include <stdlib.h>
#include <string.h>
#include <assert.h>

Song *newNullSong(void)
{
	Song *song = malloc(sizeof(Song));

	song->tag = NULL;
	song->url = NULL;
	song->type = SONG_TYPE_FILE;
	song->parentDir = NULL;

	return song;
}

Song *newSong(char *url, int type, Directory * parentDir)
{
	Song *song = NULL;

	if (strchr(url, '\n')) {
		DEBUG("newSong: '%s' is not a valid uri\n", url);
		return NULL;
	}

	song = newNullSong();

	song->url = strdup(url);
	song->type = type;
	song->parentDir = parentDir;

	assert(type == SONG_TYPE_URL || parentDir);

	if (song->type == SONG_TYPE_FILE) {
		InputPlugin *plugin;
		unsigned int next = 0;
		char *song_url = getSongUrl(song);
		char *abs_path = rmp2amp(utf8ToFsCharset(song_url));
		while (!song->tag && (plugin = isMusic(song_url,
						       &(song->mtime),
						       next++))) {
			song->tag = plugin->tagDupFunc(abs_path);
		}
		if (!song->tag || song->tag->time < 0) {
			freeSong(song);
			song = NULL;
		}
	}

	return song;
}

void freeSong(Song * song)
{
	deleteASongFromPlaylist(song);
	freeJustSong(song);
}

void freeJustSong(Song * song)
{
	free(song->url);
	if (song->tag)
		freeMpdTag(song->tag);
	free(song);
	getSongUrl(NULL);
}

SongList *newSongList(void)
{
	return makeList((ListFreeDataFunc *) freeSong, 0);
}

Song *addSongToList(SongList * list, char *url, char *utf8path,
		    int songType, Directory * parentDirectory)
{
	Song *song = NULL;

	switch (songType) {
	case SONG_TYPE_FILE:
		if (isMusic(utf8path, NULL, 0)) {
			song = newSong(url, songType, parentDirectory);
		}
		break;
	case SONG_TYPE_URL:
		song = newSong(url, songType, parentDirectory);
		break;
	default:
		DEBUG("addSongToList: Trying to add an invalid song type\n");
	}

	if (song == NULL)
		return NULL;

	insertInList(list, song->url, (void *)song);

	return song;
}

void freeSongList(SongList * list)
{
	freeList(list);
}

void printSongUrl(int fd, Song * song)
{
	if (song->parentDir && song->parentDir->path) {
		fdprintf(fd, "%s%s/%s\n", SONG_FILE,
			  getDirectoryPath(song->parentDir), song->url);
	} else {
		fdprintf(fd, "%s%s\n", SONG_FILE, song->url);
	}
}

int printSongInfo(int fd, Song * song)
{
	printSongUrl(fd, song);

	if (song->tag)
		printMpdTag(fd, song->tag);

	return 0;
}

int printSongInfoFromList(int fd, SongList * list)
{
	ListNode *tempNode = list->firstNode;

	while (tempNode != NULL) {
		printSongInfo(fd, (Song *) tempNode->data);
		tempNode = tempNode->nextNode;
	}

	return 0;
}

void writeSongInfoFromList(FILE * fp, SongList * list)
{
	ListNode *tempNode = list->firstNode;

	fprintf(fp, "%s\n", SONG_BEGIN);

	while (tempNode != NULL) {
		fprintf(fp, "%s%s\n", SONG_KEY, tempNode->key);
		fflush(fp);
		printSongInfo(fileno(fp), (Song *) tempNode->data);
		fprintf(fp, "%s%li\n", SONG_MTIME,
			  (long)((Song *) tempNode->data)->mtime);
		tempNode = tempNode->nextNode;
	}

	fprintf(fp, "%s\n", SONG_END);
}

static void insertSongIntoList(SongList * list, ListNode ** nextSongNode,
			       char *key, Song * song)
{
	ListNode *nodeTemp;
	int cmpRet = 0;

	while (*nextSongNode
	       && (cmpRet = strcmp(key, (*nextSongNode)->key)) > 0) {
		nodeTemp = (*nextSongNode)->nextNode;
		deleteNodeFromList(list, *nextSongNode);
		*nextSongNode = nodeTemp;
	}

	if (!(*nextSongNode)) {
		insertInList(list, song->url, (void *)song);
	} else if (cmpRet == 0) {
		Song *tempSong = (Song *) ((*nextSongNode)->data);
		if (tempSong->mtime != song->mtime) {
			freeMpdTag(tempSong->tag);
			tempSong->tag = song->tag;
			tempSong->mtime = song->mtime;
			song->tag = NULL;
		}
		freeJustSong(song);
		*nextSongNode = (*nextSongNode)->nextNode;
	} else {
		insertInListBeforeNode(list, *nextSongNode, -1, song->url,
				       (void *)song);
	}
}

static int matchesAnMpdTagItemKey(char *buffer, int *itemType)
{
	int i;

	for (i = 0; i < TAG_NUM_OF_ITEM_TYPES; i++) {
		if (0 == strncmp(mpdTagItemKeys[i], buffer,
				 strlen(mpdTagItemKeys[i]))) {
			*itemType = i;
			return 1;
		}
	}

	return 0;
}

void readSongInfoIntoList(FILE * fp, SongList * list, Directory * parentDir)
{
	char buffer[MAXPATHLEN + 1024];
	int bufferSize = MAXPATHLEN + 1024;
	Song *song = NULL;
	ListNode *nextSongNode = list->firstNode;
	ListNode *nodeTemp;
	int itemType;

	while (myFgets(buffer, bufferSize, fp) && 0 != strcmp(SONG_END, buffer)) {
		if (0 == strncmp(SONG_KEY, buffer, strlen(SONG_KEY))) {
			if (song) {
				insertSongIntoList(list, &nextSongNode,
						   song->url, song);
				song = NULL;
			}

			song = newNullSong();
			song->url = strdup(buffer + strlen(SONG_KEY));
			song->type = SONG_TYPE_FILE;
			song->parentDir = parentDir;
		} else if (0 == strncmp(SONG_FILE, buffer, strlen(SONG_FILE))) {
			if (!song) {
				ERROR("Problems reading song info\n");
				exit(EXIT_FAILURE);
			}
			/* we don't need this info anymore
			   song->url = strdup(&(buffer[strlen(SONG_FILE)]));
			 */
		} else if (matchesAnMpdTagItemKey(buffer, &itemType)) {
			if (!song->tag)
				song->tag = newMpdTag();
			addItemToMpdTag(song->tag, itemType,
					&(buffer
					  [strlen(mpdTagItemKeys[itemType]) +
					   2]));
		} else if (0 == strncmp(SONG_TIME, buffer, strlen(SONG_TIME))) {
			if (!song->tag)
				song->tag = newMpdTag();
			song->tag->time = atoi(&(buffer[strlen(SONG_TIME)]));
		} else if (0 == strncmp(SONG_MTIME, buffer, strlen(SONG_MTIME))) {
			song->mtime = atoi(&(buffer[strlen(SONG_MTIME)]));
		}
		/* ignore empty lines (starting with '\0') */
		else if (*buffer) {
			ERROR("songinfo: unknown line in db: %s\n", buffer);
			exit(EXIT_FAILURE);
		}
	}

	if (song) {
		insertSongIntoList(list, &nextSongNode, song->url, song);
		song = NULL;
	}

	while (nextSongNode) {
		nodeTemp = nextSongNode->nextNode;
		deleteNodeFromList(list, nextSongNode);
		nextSongNode = nodeTemp;
	}
}

int updateSongInfo(Song * song)
{
	if (song->type == SONG_TYPE_FILE) {
		InputPlugin *plugin;
		unsigned int next = 0;
		char *song_url = getSongUrl(song);
		char *abs_path = rmp2amp(song_url);

		if (song->tag)
			freeMpdTag(song->tag);

		song->tag = NULL;

		while (!song->tag && (plugin = isMusic(song_url,
						       &(song->mtime),
						       next++))) {
			song->tag = plugin->tagDupFunc(abs_path);
		}
		if (!song->tag || song->tag->time < 0)
			return -1;
	}

	return 0;
}

/* pass song = NULL to reset, we do this freeJustSong(), so that if
 * 	we free and recreate this memory we make sure to print it correctly*/
char *getSongUrl(Song * song)
{
	static char *buffer = NULL;
	static int bufferSize = 0;
	static Song *lastSong = NULL;
	int slen;
	int dlen;
	int size;

	if (!song) {
		lastSong = song;
		return NULL;
	}

	if (!song->parentDir || !song->parentDir->path)
		return song->url;

	/* be careful with this! */
	if (song == lastSong)
		return buffer;

	slen = strlen(song->url);
	dlen = strlen(getDirectoryPath(song->parentDir));

	size = slen + dlen + 2;

	if (size > bufferSize) {
		buffer = realloc(buffer, size);
		bufferSize = size;
	}

	strcpy(buffer, getDirectoryPath(song->parentDir));
	buffer[dlen] = '/';
	strcpy(buffer + dlen + 1, song->url);

	return buffer;
}