The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/label/g_label_iso9660.c

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    1 /*-
    2  * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: src/sys/geom/label/g_label_iso9660.c,v 1.1 2004/07/02 19:40:34 pjd Exp $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/malloc.h>
   34 
   35 #include <geom/geom.h>
   36 #include <geom/label/g_label.h>
   37 
   38 #define G_LABEL_ISO9660_DIR     "iso9660"
   39 
   40 #define ISO9660_MAGIC   "\x01" "CD001" "\x01\x00"
   41 #define VOLUME_LEN      32
   42 
   43 
   44 static void
   45 g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size)
   46 {
   47         struct g_provider *pp;
   48         char *sector, *volume;
   49         int i, error;
   50 
   51         g_topology_assert_not();
   52         pp = cp->provider;
   53         label[0] = '\0';
   54 
   55         sector = (char *)g_read_data(cp, 0x8000, pp->sectorsize, &error);
   56         if (sector == NULL || error != 0)
   57                 return;
   58         if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) {
   59                 g_free(sector);
   60                 return;
   61         }
   62         G_LABEL_DEBUG(1, "ISO9660 file system detected on %s.", pp->name);
   63         volume = sector + 0x28;
   64         bzero(label, size);
   65         strlcpy(label, volume, MIN(size, VOLUME_LEN));
   66         g_free(sector);
   67         for (i = size - 1; i > 0; i--) {
   68                 if (label[i] == '\0')
   69                         continue;
   70                 else if (label[i] == ' ')
   71                         label[i] = '\0';
   72                 else
   73                         break;
   74         }
   75 }
   76 
   77 const struct g_label_desc g_label_iso9660 = {
   78         .ld_taste = g_label_iso9660_taste,
   79         .ld_dir = G_LABEL_ISO9660_DIR
   80 };

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