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/*
$Id: _cdio_generic.c,v 1.2 2004/04/11 12:20:31 miguelfreitas Exp $
Copyright (C) 2001 Herbert Valerio Riedel <hvr@gnu.org>
Copyright (C) 2002, 2003, 2004 Rocky Bernstein <rocky@panix.com>
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
*/
/* This file contains Linux-specific code and implements low-level
control of the CD drive.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static const char _rcsid[] = "$Id: _cdio_generic.c,v 1.2 2004/04/11 12:20:31 miguelfreitas Exp $";
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <cdio/sector.h>
#include <cdio/util.h>
#include "cdio_assert.h"
#include "cdio_private.h"
#include "_cdio_stdio.h"
/*!
Eject media -- there's nothing to do here. We always return 2.
Should we also free resources?
*/
int
cdio_generic_bogus_eject_media (void *user_data) {
/* Sort of a stub here. Perhaps log a message? */
return 2;
}
/*!
Release and free resources associated with cd.
*/
void
cdio_generic_free (void *user_data)
{
generic_img_private_t *_obj = user_data;
if (NULL == _obj) return;
free (_obj->source_name);
if (_obj->fd >= 0)
close (_obj->fd);
free (_obj);
}
/*!
Initialize CD device.
*/
bool
cdio_generic_init (void *user_data)
{
generic_img_private_t *_obj = user_data;
if (_obj->init) {
cdio_error ("init called more than once");
return false;
}
_obj->fd = open (_obj->source_name, O_RDONLY, 0);
if (_obj->fd < 0)
{
cdio_warn ("open (%s): %s", _obj->source_name, strerror (errno));
return false;
}
_obj->init = true;
_obj->toc_init = false;
return true;
}
/*!
Reads into buf the next size bytes.
Returns -1 on error.
Is in fact libc's read().
*/
off_t
cdio_generic_lseek (void *user_data, off_t offset, int whence)
{
generic_img_private_t *_obj = user_data;
return lseek(_obj->fd, offset, whence);
}
/*!
Reads into buf the next size bytes.
Returns -1 on error.
Is in fact libc's read().
*/
ssize_t
cdio_generic_read (void *user_data, void *buf, size_t size)
{
generic_img_private_t *_obj = user_data;
return read(_obj->fd, buf, size);
}
/*!
Release and free resources associated with stream or disk image.
*/
void
cdio_generic_stdio_free (void *user_data)
{
generic_img_private_t *_obj = user_data;
if (NULL == _obj) return;
free (_obj->source_name);
if (_obj->data_source)
cdio_stdio_destroy (_obj->data_source);
}
/*!
Return true if source_name could be a device containing a CD-ROM.
*/
bool
cdio_is_device_generic(const char *source_name)
{
struct stat buf;
if (0 != stat(source_name, &buf)) {
cdio_warn ("Can't get file status for %s:\n%s", source_name,
strerror(errno));
return false;
}
return (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode));
}
/*!
Like above, but don't give a warning device doesn't exist.
*/
bool
cdio_is_device_quiet_generic(const char *source_name)
{
struct stat buf;
if (0 != stat(source_name, &buf)) {
return false;
}
return (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode));
}
/*!
Add/allocate a drive to the end of drives.
Use cdio_free_device_list() to free this device_list.
*/
void
cdio_add_device_list(char **device_list[], const char *drive, int *num_drives)
{
if (NULL != drive) {
unsigned int j;
/* Check if drive is already in list. */
for (j=0; j<*num_drives; j++) {
if (strcmp((*device_list)[j], drive) == 0) break;
}
if (j==*num_drives) {
/* Drive not in list. Add it. */
(*num_drives)++;
if (*device_list) {
*device_list = realloc(*device_list, (*num_drives) * sizeof(char *));
} else {
/* num_drives should be 0. Add assert? */
*device_list = malloc((*num_drives) * sizeof(char *));
}
(*device_list)[*num_drives-1] = strdup(drive);
}
} else {
(*num_drives)++;
if (*device_list) {
*device_list = realloc(*device_list, (*num_drives) * sizeof(char *));
} else {
*device_list = malloc((*num_drives) * sizeof(char *));
}
(*device_list)[*num_drives-1] = NULL;
}
}
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