usr.sbin/mscdlabel/iso9660.c

   1 /* $NetBSD: iso9660.c,v 1.1 2004/07/04 14:11:44 drochner Exp $ */
   2
   3 #include <sys/types.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include <string.h>
   7 #include <stdio.h>
   8 #include <err.h>
   9 #include <isofs/cd9660/iso.h>
  10
  11 #include "mscdlabel.h"
  12
  13 #define BLKSIZ ISO_DEFAULT_BLOCK_SIZE
  14
  15 static void
  16 printinfo(struct iso_primary_descriptor *vd)
  17 {
  18         char label[32 + 1], date[] = "yyyy/mm/dd hh:mm", *d;
  19
  20         strlcpy(label, vd->volume_id, sizeof(label));
  21         /* strip trailing blanks */
  22         d = label + strlen(label);
  23         while (d > label && *(d - 1) == ' ')
  24                 d--;
  25         *d = '\0';
  26
  27         d = vd->creation_date;
  28         memcpy(date, d, 4); /* year */
  29         memcpy(date + 5, d + 4, 2); /* month */
  30         memcpy(date + 8, d + 6, 2); /* day */
  31         memcpy(date + 11, d + 8, 2); /* hour */
  32         memcpy(date + 14, d + 10, 2); /* min */
  33         printf("ISO filesystem, label \"%s\", creation time: %s\n",
  34                label, date);
  35 }
  36
  37 int
  38 check_primary_vd(int fd, int start, int len)
  39 {
  40         int i, res, isiso;
  41         struct iso_primary_descriptor *vd;
  42
  43         isiso = 0;
  44         vd = malloc(BLKSIZ);
  45
  46         for (i = 16; (i < 100) && (i < len); i++) {
  47                 res = pread(fd, vd, BLKSIZ, (start + i) * BLKSIZ);
  48                 if (res < 0) {
  49                         warn("read CD sector %d", start + i);
  50                         break;
  51                 }
  52
  53                 if (memcmp(vd->id, ISO_STANDARD_ID, sizeof(vd->id)))
  54                         continue;
  55                 if (isonum_711(vd->type) == ISO_VD_PRIMARY) {
  56                         printinfo(vd);
  57                         isiso = 1;
  58                         break;
  59                 } else if (isonum_711(vd->type) == ISO_VD_END)
  60                         break;
  61         }
  62
  63         free(vd);
  64         return (isiso);
  65 }