152 lines
3.4 KiB
C
152 lines
3.4 KiB
C
/*
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$Id: sector.c,v 1.10 2004/06/05 02:49:21 rocky Exp $
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Copyright (C) 2004 Rocky Bernstein <rocky@panix.com>
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Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <cdio/sector.h>
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#include <cdio/util.h>
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#include <cdio/logging.h>
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#include "cdio_assert.h"
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#include <stdio.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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static const char _rcsid[] = "$Id: sector.c,v 1.10 2004/06/05 02:49:21 rocky Exp $";
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lba_t
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cdio_lba_to_lsn (lba_t lba)
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{
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if (CDIO_INVALID_LBA == lba) return CDIO_INVALID_LSN;
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return lba - CDIO_PREGAP_SECTORS;
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}
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/*
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The below is adapted from cdparanoia code which claims it is
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straight from the MMC3 spec.
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*/
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void
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cdio_lsn_to_msf (lsn_t lsn, msf_t *msf)
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{
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int m, s, f;
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cdio_assert (msf != 0);
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if ( lsn >= -CDIO_PREGAP_SECTORS ){
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m = (lsn + CDIO_PREGAP_SECTORS) / CDIO_CD_FRAMES_PER_MIN;
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lsn -= m * CDIO_CD_FRAMES_PER_MIN;
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s = (lsn + CDIO_PREGAP_SECTORS) / CDIO_CD_FRAMES_PER_SEC;
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lsn -= s * CDIO_CD_FRAMES_PER_SEC;
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f = lsn + CDIO_PREGAP_SECTORS;
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} else {
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m = (lsn + CDIO_CD_MAX_LSN) / CDIO_CD_FRAMES_PER_MIN;
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lsn -= m * (CDIO_CD_FRAMES_PER_MIN);
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s = (lsn+CDIO_CD_MAX_LSN) / CDIO_CD_FRAMES_PER_SEC;
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lsn -= s * CDIO_CD_FRAMES_PER_SEC;
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f = lsn + CDIO_CD_MAX_LSN;
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}
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if (m > 99) {
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cdio_warn ("number of minutes (%d) truncated to 99.", m);
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m = 99;
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}
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msf->m = to_bcd8 (m);
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msf->s = to_bcd8 (s);
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msf->f = to_bcd8 (f);
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}
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/* warning, returns new allocated string */
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char *
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cdio_lba_to_msf_str (lba_t lba)
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{
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if (CDIO_INVALID_LBA == lba) {
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return strdup("*INVALID");
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} else {
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msf_t msf = { .m = 0, .s = 0, .f = 0 };
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cdio_lba_to_msf (lba, &msf);
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return cdio_msf_to_str(&msf);
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}
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}
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lba_t
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cdio_lsn_to_lba (lsn_t lsn)
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{
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if (CDIO_INVALID_LSN == lsn) return CDIO_INVALID_LBA;
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return lsn + CDIO_PREGAP_SECTORS;
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}
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void
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cdio_lba_to_msf (lba_t lba, msf_t *msf)
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{
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cdio_assert (msf != 0);
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cdio_lsn_to_msf(cdio_lba_to_lsn(lba), msf);
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}
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lba_t
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cdio_msf_to_lba (const msf_t *msf)
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{
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uint32_t lba = 0;
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cdio_assert (msf != 0);
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lba = from_bcd8 (msf->m);
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lba *= CDIO_CD_SECS_PER_MIN;
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lba += from_bcd8 (msf->s);
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lba *= CDIO_CD_FRAMES_PER_SEC;
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lba += from_bcd8 (msf->f);
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return lba;
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}
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lba_t
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cdio_msf_to_lsn (const msf_t *msf)
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{
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return cdio_lba_to_lsn(cdio_msf_to_lba (msf));
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}
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/* warning, returns new allocated string */
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char *
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cdio_msf_to_str (const msf_t *msf)
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{
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char buf[16];
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snprintf (buf, sizeof (buf), "%.2x:%.2x.%.2x", msf->m, msf->s, msf->f);
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return strdup (buf);
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}
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/*
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* Local variables:
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* c-file-style: "gnu"
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*/
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