109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
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/* @(#)isosize.c 1.13 10/01/03 Copyright 1996, 2001-2010 J. Schilling */
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#include <schily/mconfig.h>
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#ifndef lint
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static UConst char sccsid[] =
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"@(#)isosize.c 1.13 10/01/03 Copyright 1996, 2001-2010 J. Schilling";
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#endif
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/*
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* Copyright (c) 1996, 2001-2010 J. Schilling
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*/
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/*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* See the file CDDL.Schily.txt in this distribution for details.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file CDDL.Schily.txt from this distribution.
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*/
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#include <schily/mconfig.h>
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#include <schily/stat.h>
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#include <schily/unistd.h>
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#include <schily/standard.h>
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#include <schily/utypes.h>
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#include <schily/intcvt.h>
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#include "iso9660.h"
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#include "cdrecord.h" /* to verify isosize() prototype */
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Llong isosize __PR((int f));
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Llong
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isosize(f)
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int f;
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{
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struct iso9660_voldesc vd;
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struct iso9660_pr_voldesc *vp;
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Llong isize;
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struct stat sb;
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mode_t mode;
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/*
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* First check if a bad guy tries to call isosize()
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* with an unappropriate file descriptor.
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* return -1 in this case.
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*/
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if (isatty(f))
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return ((Llong)-1);
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if (fstat(f, &sb) < 0)
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return ((Llong)-1);
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mode = sb.st_mode & S_IFMT;
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if (!S_ISREG(mode) && !S_ISBLK(mode) && !S_ISCHR(mode))
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return ((Llong)-1);
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if (lseek(f, (off_t)(16L * 2048L), SEEK_SET) == -1)
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return ((Llong)-1);
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vp = (struct iso9660_pr_voldesc *) &vd;
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do {
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if (read(f, &vd, sizeof (vd)) <= 2048)
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return ((Llong)-1);
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if (GET_UBYTE(vd.vd_type) == VD_PRIMARY)
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break;
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} while (GET_UBYTE(vd.vd_type) != VD_TERM);
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lseek(f, (off_t)0L, SEEK_SET);
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if (GET_UBYTE(vd.vd_type) != VD_PRIMARY)
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return (-1L);
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isize = (Llong)GET_BINT(vp->vd_volume_space_size);
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isize *= GET_BSHORT(vp->vd_lbsize);
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return (isize);
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}
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Llong
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bisosize(bp, len)
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char *bp;
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int len;
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{
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struct iso9660_pr_voldesc *vp;
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Llong isize;
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int pos = 16 * 2048;
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if (len < pos)
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return ((Llong)-1);
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do {
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vp = (struct iso9660_pr_voldesc *) &bp[pos];
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pos += 2048;
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if (len < pos)
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return ((Llong)-1);
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if (GET_UBYTE(vp->vd_type) == VD_PRIMARY)
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break;
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} while (GET_UBYTE(vp->vd_type) != VD_TERM);
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if (GET_UBYTE(vp->vd_type) != VD_PRIMARY)
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return (-1L);
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isize = (Llong)GET_BINT(vp->vd_volume_space_size);
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isize *= GET_BSHORT(vp->vd_lbsize);
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return (isize);
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}
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