/***************************************************************************** * MusicDB - Copyright Eric Lorimer (8/02) * * This file implements a MusicDB module to serve local files from a database * * see the file README for some explanation of how it works. *   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., 675 Mass Ave, Cambridge, MA 02139, USA. * * **************************************************************************/#include "config.h"#include <stdio.h>#include <sys/stat.h>#include <utime.h>#include <dirent.h>#include <fcntl.h>#include <errno.h>#include <string.h>#include <includes.h>#include <vfs.h>#include "mysql.h"#include "shortcut.h"#include "musicdb.h"struct file {	int usage;	int systemfd;};static struct file fd_table[1024];static char prefix[] = "/home/music/";/**************************************************************************** * int module_init() * * clear out the file descriptor table * *************************************************************************/int module_init(){	int i;	for (i=0; i < 1024; i++)		fd_table[i].usage = 0;	return 1;}/**************************************************************************** * int module_open() * * initialize a file descriptor and return a pointer from the given entry * *************************************************************************/int module_open(struct song_entry *data){	int fd;	char realpath[256];	for (fd = 1; fd < 1024 && fd_table[fd].usage; fd++)			;	DEBUG(1, ("module_open: fname = %s, nfields = %d\n", data->fname, data->nfields));	snprintf(realpath, 256, "%s%s", prefix, data->fields[0]);	fd_table[fd].systemfd = open(realpath, O_RDONLY);	DEBUG(1, ("module_open: open(%s) returned %d\n", realpath, fd_table[fd].systemfd));	if ( fd_table[fd].systemfd == 0 )		return 0;	fd_table[fd].usage = 1;	return fd;}/**************************************************************************** * int module_close() * * simple; pass on to system * *************************************************************************/int module_close(int fd){	if ( fd > 0 && fd < 1024 ) {		close(fd_table[fd].systemfd);		fd_table[fd].usage = 0;	}	return 0;}/**************************************************************************** * int module_read() * * simple; pass on to local filesystem * *************************************************************************/ssize_t module_read(int fd, void *data, size_t n){	if ( fd < 0 || fd > 1024 || fd_table[fd].usage < 1 ) {		errno = EBADF;		return -1;	}	return read(fd_table[fd].systemfd, data, n);}/**************************************************************************** * int module_lseek() * * lseek the file * *************************************************************************/SMB_OFF_T module_lseek(int fd, SMB_OFF_T offset, int whence){	if ( fd < 0 || fd > 1024 || fd_table[fd].usage < 1 ) {		errno = EBADF;		return -1;	}	return lseek(fd_table[fd].systemfd, offset, whence);}/**************************************************************************** * int module_fstat() * * return stat information from an open file descriptor * *************************************************************************/int module_fstat(int fd, SMB_STRUCT_STAT *sbuf){	if ( fd < 0 || fd > 1024 || fd_table[fd].usage < 1 ) {		errno = EBADF;		return -1;	}	return fstat(fd_table[fd].systemfd, sbuf);}