cd_read_toc.c

对SCSI设备 直接存取的通用库

/*
  cd_read_toc -- read leadin track from cd
  Copyright (C) 1996 Dieter Baron and Armin Obersteiner

  This file is part of libscsi, a library for direct scsi device access
  The authors can be contacted at
	<[e-mail]>
	<[e-mail]>

  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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <scsi/cd.h>



int
sc_cd_read_toc(SCSI *fd, int msf, int first,
	       u_short len, struct sc_cd_toc *toc)
{
    static unsigned char cmd[10] = { 0x43 };
    int result, i;
    u_short notr;
    u_long addr;

    cmd[1] = (msf ? 0x2 : 0);
    cmd[6] = first;
    sc_store_s(cmd+7, len);
    if ((result=sc_send(fd, SC_READ, 10, cmd, len, (char *)toc)) >= 0) {
	sc_fetch_s(notr, (u_char *)&(toc->notr));
	toc->notr = (notr-2)/sizeof(struct sc_cd_toc_track);
#if !SC_BIGENDIAN
	for (i=0; i<toc->notr; i++) {
	    sc_fetch_l(addr, (u_char *)&(toc->track[i].addr));
	    toc->track[i].addr = addr;
	}
#endif
    }

    return result;
}