1 files changed, 86 insertions, 0 deletions
diff --git a/wodim/isosize.c b/wodim/isosize.c
new file mode 100644
index 0000000..b3f6624
--- /dev/null
+++ b/wodim/isosize.c
@@ -0,0 +1,86 @@
+/*
+ * 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);
+}