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Viewing changes to libblkid/src/superblocks/iso9660.c

  • Committer: Package Import Robot
  • Author(s): LaMont Jones
  • Date: 2011-11-03 15:38:23 UTC
  • mto: (4.5.5 sid) (1.6.4)
  • mto: This revision was merged to the branch mainline in revision 85.
  • Revision ID: package-import@ubuntu.com-20111103153823-10sx16jprzxlhkqf
Import upstream version 2.20.1

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libblkid/src/superblocks/iso9660.c
 
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/*
 
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 * Copyright (C) 1999 by Andries Brouwer
 
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 * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
 
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 * Copyright (C) 2001 by Andreas Dilger
 
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 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
 
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 * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
 
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 *
 
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 * Inspired also by libvolume_id by
 
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 *     Kay Sievers <kay.sievers@vrfy.org>
 
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 *
 
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 * This file may be redistributed under the terms of the
 
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 * GNU Lesser General Public License.
 
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 */
 
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#include <stdio.h>
 
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#include <stdlib.h>
 
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#include <unistd.h>
 
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#include <string.h>
 
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#include <stdint.h>
 
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#include "superblocks.h"
 
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/* PVD - Primary volume descriptor */
 
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struct iso_volume_descriptor {
 
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        unsigned char   vd_type;
 
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        unsigned char   vd_id[5];
 
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        unsigned char   vd_version;
 
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        unsigned char   flags;
 
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        unsigned char   system_id[32];
 
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        unsigned char   volume_id[32];
 
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        unsigned char   unused[8];
 
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        unsigned char   space_size[8];
 
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        unsigned char   escape_sequences[8];
 
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} __attribute__((packed));
 
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#define ISO_SUPERBLOCK_OFFSET           0x8000
 
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#define ISO_SECTOR_SIZE                 0x800
 
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#define ISO_VD_OFFSET                   (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE)
 
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#define ISO_VD_SUPPLEMENTARY            0x2
 
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#define ISO_VD_END                      0xff
 
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#define ISO_VD_MAX                      16
 
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struct high_sierra_volume_descriptor {
 
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        unsigned char   foo[8];
 
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        unsigned char   type;
 
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        unsigned char   id[5];
 
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        unsigned char   version;
 
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        unsigned char   unused1;
 
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        unsigned char   system_id[32];
 
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        unsigned char   volume_id[32];
 
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} __attribute__((packed));
 
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/* returns 1 if the begin of @ascii is equal to @utf16 string.
 
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 */
 
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static int ascii_eq_utf16be(unsigned char *ascii,
 
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                        unsigned char *utf16, size_t len)
 
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{
 
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        size_t a, u;
 
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        for (a = 0, u = 0; u < len; a++, u += 2) {
 
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                if (utf16[u] != 0x0 || ascii[a] != utf16[u + 1])
 
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                        return 0;
 
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        }
 
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        return 1;
 
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}
 
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/* old High Sierra format */
 
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static int probe_iso9660_hsfs(blkid_probe pr, const struct blkid_idmag *mag)
 
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{
 
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        struct high_sierra_volume_descriptor *iso;
 
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        iso = blkid_probe_get_sb(pr, mag, struct high_sierra_volume_descriptor);
 
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        if (!iso)
 
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                return -1;
 
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        blkid_probe_set_version(pr, "High Sierra");
 
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        blkid_probe_set_label(pr, iso->volume_id, sizeof(iso->volume_id));
 
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        return 0;
 
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}
 
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/* iso9660 [+ Microsoft Joliet Extension] */
 
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static int probe_iso9660(blkid_probe pr, const struct blkid_idmag *mag)
 
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{
 
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        struct iso_volume_descriptor *iso;
 
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        unsigned char label[32];
 
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        int i;
 
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        int off;
 
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        if (strcmp(mag->magic, "CDROM") == 0)
 
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                return probe_iso9660_hsfs(pr, mag);
 
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        iso = blkid_probe_get_sb(pr, mag, struct iso_volume_descriptor);
 
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        if (!iso)
 
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                return -1;
 
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        memcpy(label, iso->volume_id, sizeof(label));
 
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        /* Joliet Extension */
 
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        off = ISO_VD_OFFSET;
 
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        for (i = 0; i < ISO_VD_MAX; i++) {
 
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                iso = (struct iso_volume_descriptor *)
 
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                        blkid_probe_get_buffer(pr,
 
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                                        off,
 
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                                        sizeof(struct iso_volume_descriptor));
 
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                if (iso == NULL || iso->vd_type == ISO_VD_END)
 
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                        break;
 
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                if (iso->vd_type != ISO_VD_SUPPLEMENTARY)
 
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                        continue;
 
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                if (memcmp(iso->escape_sequences, "%/@", 3) == 0 ||
 
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                    memcmp(iso->escape_sequences, "%/C", 3) == 0 ||
 
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                    memcmp(iso->escape_sequences, "%/E", 3) == 0) {
 
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                        blkid_probe_set_version(pr, "Joliet Extension");
 
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                        /* Is the Joliet (UTF16BE) label equal to the label in
 
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                         * the PVD? If yes, use PVD label.  The Jolied version
 
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                         * of the label could be trimed (because UTF16..).
 
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                         */
 
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                        if (ascii_eq_utf16be(label, iso->volume_id, 32))
 
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                                break;
 
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                        blkid_probe_set_utf8label(pr,
 
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                                        iso->volume_id,
 
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                                        sizeof(iso->volume_id),
 
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                                        BLKID_ENC_UTF16BE);
 
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                        goto has_label;
 
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                }
 
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                off += ISO_SECTOR_SIZE;
 
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        }
 
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        /* Joliet not found, let use standard iso label */
 
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        blkid_probe_set_label(pr, label, sizeof(label));
 
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has_label:
 
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        return 0;
 
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}
 
138
 
 
139
 
 
140
const struct blkid_idinfo iso9660_idinfo =
 
141
{
 
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        .name           = "iso9660",
 
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        .usage          = BLKID_USAGE_FILESYSTEM,
 
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        .probefunc      = probe_iso9660,
 
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        .flags          = BLKID_IDINFO_TOLERANT,
 
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        .magics         =
 
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        {
 
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                { .magic = "CD001", .len = 5, .kboff = 32, .sboff = 1 },
 
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                { .magic = "CDROM", .len = 5, .kboff = 32, .sboff = 9 },
 
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                { NULL }
 
151
        }
 
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};
 
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