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/*
* This file has been modified for the cdrkit suite.
*
* The behaviour and appearence of the program code below can differ to a major
* extent from the version distributed by the original author(s).
*
* For details, see Changelog file distributed with the cdrkit package. If you
* received this file from another source then ask the distributing person for
* a log of modifications.
*
*/
/* @(#)isosize.c 1.9 04/03/02 Copyright 1996, 2001-2004 J. Schilling */
/*
* Copyright (c) 1996, 2001-2004 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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; see the file COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <mconfig.h>
#include <statdefs.h>
#include <unixstd.h>
#include <standard.h>
#include <utypes.h>
#include <intcvt.h>
#include "iso9660.h"
#include "wodim.h" /* to verify isosize() prototype */
Llong isosize(int f);
Llong
isosize(int f)
{
struct iso9660_voldesc vd;
struct iso9660_pr_voldesc *vp;
Llong isize;
struct stat sb;
mode_t mode;
/*
* First check if a bad guy tries to call isosize()
* with an unappropriate file descriptor.
* return -1 in this case.
*/
if (isatty(f))
return ((Llong)-1);
if (fstat(f, &sb) < 0)
return ((Llong)-1);
mode = sb.st_mode & S_IFMT;
if (!S_ISREG(mode) && !S_ISBLK(mode) && !S_ISCHR(mode))
return ((Llong)-1);
if (lseek(f, (off_t)(16L * 2048L), SEEK_SET) == -1)
return ((Llong)-1);
vp = (struct iso9660_pr_voldesc *) &vd;
do {
read(f, &vd, sizeof (vd)); /* FIXME: check return value */
if (GET_UBYTE(vd.vd_type) == VD_PRIMARY)
break;
} while (GET_UBYTE(vd.vd_type) != VD_TERM);
lseek(f, (off_t)0L, SEEK_SET);
if (GET_UBYTE(vd.vd_type) != VD_PRIMARY)
return (-1L);
isize = (Llong)GET_BINT(vp->vd_volume_space_size);
isize *= GET_BSHORT(vp->vd_lbsize);
return (isize);
}
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