/* * volume_id - reads filesystem label and uuid * * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ //kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_ISO9660) += iso9660.o //config: //config:config FEATURE_VOLUMEID_ISO9660 //config: bool "iso9660 filesystem" //config: default y //config: depends on VOLUMEID //config: help //config: TODO //config: #include "volume_id_internal.h" #define ISO_SUPERBLOCK_OFFSET 0x8000 #define ISO_SECTOR_SIZE 0x800 #define ISO_VD_OFFSET (ISO_SUPERBLOCK_OFFSET + ISO_SECTOR_SIZE) #define ISO_VD_PRIMARY 0x1 #define ISO_VD_SUPPLEMENTARY 0x2 #define ISO_VD_END 0xff #define ISO_VD_MAX 16 struct iso_volume_descriptor { uint8_t vd_type; uint8_t vd_id[5]; uint8_t vd_version; uint8_t flags; uint8_t system_id[32]; uint8_t volume_id[32]; uint8_t unused[8]; uint8_t space_size[8]; uint8_t escape_sequences[8]; } PACKED; struct high_sierra_volume_descriptor { uint8_t foo[8]; uint8_t type; uint8_t id[4]; uint8_t version; } PACKED; int FAST_FUNC volume_id_probe_iso9660(struct volume_id *id /*,uint64_t off*/) { #define off ((uint64_t)0) uint8_t *buf; struct iso_volume_descriptor *is; struct high_sierra_volume_descriptor *hs; dbg("probing at offset 0x%llx", (unsigned long long) off); buf = volume_id_get_buffer(id, off + ISO_SUPERBLOCK_OFFSET, 0x200); if (buf == NULL) return -1; is = (struct iso_volume_descriptor *) buf; if (memcmp(is->vd_id, "CD001", 5) == 0) { int vd_offset; int i; dbg("read label from PVD"); // volume_id_set_label_raw(id, is->volume_id, 32); volume_id_set_label_string(id, is->volume_id, 32); dbg("looking for SVDs"); vd_offset = ISO_VD_OFFSET; for (i = 0; i < ISO_VD_MAX; i++) { uint8_t svd_label[64]; is = volume_id_get_buffer(id, off + vd_offset, 0x200); if (is == NULL || is->vd_type == ISO_VD_END) break; if (is->vd_type != ISO_VD_SUPPLEMENTARY) continue; dbg("found SVD at offset 0x%llx", (unsigned long long) (off + vd_offset)); if (memcmp(is->escape_sequences, "%/@", 3) == 0 || memcmp(is->escape_sequences, "%/C", 3) == 0 || memcmp(is->escape_sequences, "%/E", 3) == 0 ) { dbg("Joliet extension found"); volume_id_set_unicode16((char *)svd_label, sizeof(svd_label), is->volume_id, BE, 32); if (memcmp(id->label, svd_label, 16) == 0) { dbg("SVD label is identical, use the possibly longer PVD one"); break; } // volume_id_set_label_raw(id, is->volume_id, 32); volume_id_set_label_string(id, svd_label, 32); // strcpy(id->type_version, "Joliet Extension"); goto found; } vd_offset += ISO_SECTOR_SIZE; } goto found; } hs = (struct high_sierra_volume_descriptor *) buf; if (memcmp(hs->id, "CDROM", 5) == 0) { // strcpy(id->type_version, "High Sierra"); goto found; } return -1; found: // volume_id_set_usage(id, VOLUME_ID_FILESYSTEM); IF_FEATURE_BLKID_TYPE(id->type = "iso9660";) return 0; }