/* $NetBSD: main.c,v 1.6 2018/01/23 21:06:25 sevan Exp $ */

/*
* Copyright (c) 2002, 2005
*      Matthias Drochner.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

/*
* Generate an in-core disklabel for a CD, containing entries for
* previous data tracks (supposed to be of previous sessions).
* TODO:
*  - support simulation of multisession CDs in a vnd(4) disk
*/

#include <sys/param.h>
#include <sys/types.h>
#include <sys/cdio.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/stat.h>

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <err.h>
#include <util.h>
#include <string.h>

#include "dkcksum.h"
#include "mscdlabel.h"

static int getcdtoc(int);
static int getfaketoc(int);

const char *disk = "cd0";
int ntracks;
struct cd_toc_entry *tocbuf;

static int
getcdtoc(int fd)
{
       int res;
       struct ioc_toc_header th;
       struct ioc_read_toc_entry te;
       size_t tocbufsize;

       memset(&th, 0, sizeof(th));
       res = ioctl(fd, CDIOREADTOCHEADER, &th);
       if (res < 0) {
               warn("CDIOREADTOCHEADER");
               return (-1);
       }

       ntracks = th.ending_track - th.starting_track + 1;
       /* one more for leadout track, for tracklen calculation */
       tocbufsize = (ntracks + 1) * sizeof(struct cd_toc_entry);
       tocbuf = malloc(tocbufsize);
       if (!tocbuf)
               err(3, "alloc TOC buffer");
       memset(&te, 0, sizeof(te));
       te.address_format = CD_LBA_FORMAT;
       te.starting_track = th.starting_track; /* always 1 ??? */
       te.data_len = tocbufsize;
       te.data = tocbuf;
       res = ioctl(fd, CDIOREADTOCENTRIES, &te);
       if (res < 0)
               err(4, "CDIOREADTOCENTRIES");
       return (0);
}

static int
getfaketoc(int fd)
{
       int res;
       struct stat st;

       res = fstat(fd, &st);
       if (res < 0)
               err(4, "fstat");

       if (st.st_size % 2048) {
               warnx("size not multiple of 2048");
               return (-1);
       }

       tocbuf = malloc(2 * sizeof(struct cd_toc_entry));
       if (!tocbuf)
               err(3, "alloc TOC buffer");

       /*
        * fake up a data track spanning the whole file and a leadout track,
        * just as much as necessary for the scan below
        */
       tocbuf[0].addr.lba = 0;
       tocbuf[0].control = 4;
       tocbuf[1].addr.lba = st.st_size / 2048;
       tocbuf[1].control = 0;
       ntracks = 1;
       return (0);
}

int
main(int argc, char *argv[])
{
       int fd, res, i, j, rawpart;
       char fullname[MAXPATHLEN];
       struct cd_toc_entry *track;
       struct disklabel label;
       struct partition *p;
       int readonly = 0;

       if (argc > 1)
               disk = argv[1];

       fd = opendisk(disk, O_RDWR, fullname, MAXPATHLEN, 0);
       if (fd < 0) {
               warn("opendisk (read-write) %s", disk);
               fd = opendisk(disk, O_RDONLY, fullname, MAXPATHLEN, 0);
               if (fd < 0)
                       err(1, "opendisk %s", disk);
               readonly = 1;
       }

       /*
        * Get the TOC: first try to read a real one from a CD drive.
        * If this fails we might have something else keeping an ISO image
        * (eg. vnd(4) or plain file).
        */
       if (getcdtoc(fd) < 0 && getfaketoc(fd) < 0)
               exit(2);

       /*
        * Get label template. If this fails we might have a plain file.
        * Proceed to print out possible ISO label information, but
        * don't try to write a label back.
        */
       res = ioctl(fd, DIOCGDINFO, &label);
       if (res < 0) {
               warn("DIOCGDINFO");
               readonly = 1;
       }

       /*
        * We want entries for the sessions beginning with the most recent
        * one, in reversed time order.
        * We don't have session information here, but it is uncommon
        * to have more than one data track in one session, so we get
        * the same result.
        */
       if ((rawpart = getrawpartition()) == -1)
               err(1, "Cannot get raw partition");
       i = ntracks;
       j = 0;
       while (--i >= 0 && j < MAXPARTITIONS) {
               track = &tocbuf[i];
               printf("track (ctl=%d) at sector %d\n", track->control,
                      track->addr.lba);
               if ((track->control & 4) /* data track */
                   && check_primary_vd(fd, track->addr.lba,
                     (track+1)->addr.lba - track->addr.lba)) {
                       printf(" adding as '%c'\n", 'a' + j);
                       p = &label.d_partitions[j];
                       memset(p, 0, sizeof(struct partition));
                       p->p_size = label.d_partitions[rawpart].p_size;
                       p->p_fstype = FS_ISO9660;
                       p->p_cdsession = track->addr.lba;
                       if (++j == rawpart)
                               j++;
               }
       }
       if (!j) /* no ISO track, let the label alone */
               readonly = 1;

       if (!readonly) {
               /* write back label */
               if (label.d_npartitions < j)
                       label.d_npartitions = j;
               strncpy(label.d_packname, "mscdlabel's", 16);
               label.d_checksum = 0;
               label.d_checksum = dkcksum(&label);
               res = ioctl(fd, DIOCSDINFO, &label);
               if (res < 0)
                       err(6, "DIOCSDINFO");
       } else
               printf("disklabel not written\n");

       free(tocbuf);
       close(fd);
       return (0);
}

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