119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "volume_id_internal.h"
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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_PRIMARY 0x1
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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 iso_volume_descriptor {
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uint8_t vd_type;
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uint8_t vd_id[5];
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uint8_t vd_version;
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uint8_t flags;
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uint8_t system_id[32];
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uint8_t volume_id[32];
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uint8_t unused[8];
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uint8_t space_size[8];
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uint8_t escape_sequences[8];
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} __attribute__((__packed__));
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struct high_sierra_volume_descriptor {
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uint8_t foo[8];
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uint8_t type;
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uint8_t id[4];
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uint8_t version;
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} __attribute__((__packed__));
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int volume_id_probe_iso9660(struct volume_id *id, uint64_t off)
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{
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uint8_t *buf;
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struct iso_volume_descriptor *is;
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struct high_sierra_volume_descriptor *hs;
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dbg("probing at offset 0x%llx", (unsigned long long) off);
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buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200);
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if (buf == NULL)
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return -1;
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is = (struct iso_volume_descriptor *) buf;
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if (memcmp(is->vd_id, "CD001", 5) == 0) {
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int vd_offset;
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int i;
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dbg("read label from PVD");
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volume_id_set_label_raw(id, is->volume_id, 32);
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volume_id_set_label_string(id, is->volume_id, 32);
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dbg("looking for SVDs");
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vd_offset = ISO_VD_OFFSET;
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for (i = 0; i < ISO_VD_MAX; i++) {
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uint8_t svd_label[64];
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is = volume_id_get_buffer(id, off + vd_offset, 0x200);
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if (is == NULL || is->vd_type == ISO_VD_END)
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break;
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if (is->vd_type != ISO_VD_SUPPLEMENTARY)
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continue;
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dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset));
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if (memcmp(is->escape_sequences, "%/@", 3) == 0||
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memcmp(is->escape_sequences, "%/C", 3) == 0||
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memcmp(is->escape_sequences, "%/E", 3) == 0) {
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dbg("Joliet extension found");
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volume_id_set_unicode16((char *)svd_label, sizeof(svd_label), is->volume_id, BE, 32);
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if (memcmp(id->label, svd_label, 16) == 0) {
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dbg("SVD label is identical, use the possibly longer PVD one");
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break;
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}
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volume_id_set_label_raw(id, is->volume_id, 32);
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volume_id_set_label_string(id, svd_label, 32);
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strcpy(id->type_version, "Joliet Extension");
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goto found;
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}
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vd_offset += ISO_SECTOR_SIZE;
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}
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goto found;
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}
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hs = (struct high_sierra_volume_descriptor *) buf;
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if (memcmp(hs->id, "CDROM", 5) == 0) {
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strcpy(id->type_version, "High Sierra");
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goto found;
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}
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return -1;
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found:
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volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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id->type = "iso9660";
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return 0;
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}
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